MCP16322T-250E [MICROCHIP]
24V Input, 1A/2A Output, High Efficiency Synchronous Buck Regulator with Power Good Indication; 24V输入, 1A / 2A输出,高效率同步降压型稳压器具有电源状态良好指示型号: | MCP16322T-250E |
厂家: | MICROCHIP |
描述: | 24V Input, 1A/2A Output, High Efficiency Synchronous Buck Regulator with Power Good Indication |
文件: | 总34页 (文件大小:1064K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
MCP16321/2
24V Input, 1A/2A Output, High Efficiency Synchronous Buck Regulator
with Power Good Indication
Features
Description
• Up to 95% Typical Efficiency
• Input Voltage Range: 6.0V to 24V
• 1A Output Current (MCP16321)
• 2A Output Current (MCP16322)
The MCP16321/2 is a highly integrated, high-efficiency,
fixed frequency, synchronous step-down DC-DC
converter in a 16-pin QFN package that operates from
input voltages up to 24V. Integrated features include a
high-side and low-side N-Channel switch, fixed
frequency Peak Current Mode Control, internal
compensation, peak current limit, VOUT overvoltage
protection and overtemperature protection. Minimal
external components are necessary to develop a
complete synchronous step-down DC-DC converter
power supply.
• Fixed Output Voltages: 0.9V, 1.5V, 1.8V, 2.5V,
3.3V, 5V with 2% Output Voltage Accuracy
• Adjustable Version Output Voltage Range:
0.9V to 5V with 1.5% Reference Voltage Accuracy
• Integrated N-Channel High-Side Switch: 180 mΩ
• Integrated N-Channel Low-Side Switch: 120 mΩ
• 1 MHz Fixed Frequency
High converter efficiency is achieved by integrating a
high-speed, current limited, low resistance, high-side
N-Channel MOSFET, as well as a high-speed, low
resistance, low-side N-Channel MOSFET and
associated drive circuitry. High switching frequency
minimizes the size of the inductor and output capacitor,
resulting in a small solution size.
• Low Device Shutdown Current
• Peak Current Mode Control
• Internal Compensation
• Stable with Ceramic Capacitors
• Internal Soft-Start
• Cycle-by-Cycle Peak Current Limit
• Undervoltage Lockout (UVLO): 5.75V
• Overtemperature Protection
The MCP16321/2 device can supply 1A/2A of
continuous current while regulating the output voltage
from 0.9V to 5V. A high-performance peak current
mode architecture keeps the output voltage tightly
regulated, even during input voltage steps and output
current transient conditions that are common in power
supplies.
• VOUT Overvoltage Protection
• VOUT Voltage Supervisor Reported at the PG Pin
• Available Package: QFN-16 (3x3 mm)
The regulator can be turned on and off with a logic level
signal applied to the EN input. The EN input is internally
pulled up to a 4.2V reference and is rated for a
maximum of 6V. With EN low, typically 5 µA of current
is consumed from the input, making the part ideal for
power shedding and load distribution applications. The
PG output is an open drain output pin used to interface
with other components of the system, and can be
pulled up to a maximum of 6V.
Applications
• PIC®/dsPIC® Microcontroller Bias Supply
• 12V Industrial Input DC-DC Conversion
• Set-Top Boxes
• DSL Cable Modems
• Automotive
• Wall Cube Regulation
• SLA Battery Powered Devices
• AC-DC Digital Control Power Source
• Power Meters
The output voltage can either be fixed at output
voltages of 0.9V, 1.5V, 1.8V, 2.5V, 3.3V, 5V or
adjustable using an external resistor divider. The
MCP16321/2 is offered in a 3x3 QFN-16 surface mount
package.
• Consumer
• Medical and Health Care
• Distributed Power Supplies
© 2011 Microchip Technology Inc.
DS22285A-page 1
MCP16321/2
Package Type
MCP16321/2
3x3 QFN*
16 15 14 13
SW
SW
1
12
11
10
9
V
V
2
3
4
IN
IN
EP
17
BOOST
EN
V
IN
S
GND
5
6
7
8
* Includes Exposed Thermal Pad (EP); see Table 3-1.
Typical Applications
Typical Application with Adjustable Output Voltage
CBOOST
22 nF
L1
BOOST
VOUT
4.7 μH
4.2V @ 1A/2A
VIN
SW
VFB
6.0V to 24V
VIN
EN
36.5 kꢀ
COUT
2x22 μF
VOUT
10 kꢀ
10 kꢀ
CIN
2x10 μF
PG
SGND
PGND
Typical Application with Fixed Output Voltage
CBOOST
22 nF
L1
4.7 μH
VOUT
BOOST
3.3V @ 1A/2A
VIN
SW
VFB
6.0V to 24V
VIN
EN
COUT
2x22 μF
VOUT
10 kꢁ
CIN
2x10 μF
PG
SGND
PGND
DS22285A-page 2
© 2011 Microchip Technology Inc.
MCP16321/2
† Notice: Stresses above those listed under “Absolute
Maximum Ratings” may cause permanent damage to
the device. This is a stress rating only and functional
operation of the device at those or any other conditions
above those indicated in the operational sections of this
specification is not intended. Exposure to maximum
rating conditions for extended periods may affect
device reliability.
1.0
ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings†
V
.................................................................... -0.3V to 26.4V
IN
SW ...................................................................... -1V to 26.4V
BOOST – GND ........................................... -0.3V to (V +6V)
IN
EN,V , PG Voltage.............................................. -0.3V to 6V
FB
Continuous Total Power Dissipation .......................................
...................................................See Thermal Characteristics
Storage Temperature ....................................-65°C to +150°C
Operating Junction Temperature...................-40°C to +125°C
ESD Protection On All Pins:
HBM .........................................................................3 kV
MM ..........................................................................200V
DC CHARACTERISTICS
Electrical Characteristics: Unless otherwise indicated, TA = +25°C, VIN = 12V, VOUT = 3.3V, IOUT = 300 mA,
L = 4.7 µH, COUT = 2x22 µF, CIN = 2x10 µF. Boldface specifications apply over the TJ range of -40°C to +125°C.
Parameters
Sym
Min
Typ
Max
Units
Conditions
VIN Supply Voltage
Input Voltage
VIN
IQ
6.0
—
24
V
Quiescent Current
(Switching)
—
5.2
—
mA IOUT = 0 mA
Quiescent Current
(Non-Switching)
IQ
—
—
2.3
5
—
mA Closed Loop in
Overvoltage
IOUT = 0 mA
Quiescent Current -
Shutdown
IQ
10
µA EN = 0
VIN Undervoltage Lockout
Undervoltage Lockout Start
UVLOSTRT
UVLOHYS
5.5
5.75
0.65
6.0
V
V
VIN Rising
Undervoltage Lockout
Hysteresis
—
—
Non-Switching
Output Characteristics
Maximum Output Current
MCP16321
IOUT
IOUT
1
2
—
—
—
—
A
A
VIN = 6V to 24V
VIN = 6V to 24V
Maximum Output Current
MCP16322
Output Voltage Adjust Range
VOUT
0.9
—
5.0
V
V
Output Voltage Tolerance
in PWM Mode
VOUT-PWM
VOUT - 2%
VOUT
VOUT + 2%
IOUT = 1A
IOUT = 0A
Output Voltage Tolerance
in PFM Mode
VOUT-PFM
VOUT - 1% VOUT + 1% VOUT + 3.5%
V
Feedback Voltage
VFB
0.886
-1.5
0.9
—
0.914
1.5
V
Feedback Reference
Tolerance
VFB-TOL
%
PFM Mode Feedback
Comparator Threshold
VFB-PFM
IFB
—
—
VOUT + 1%
100
—
—
V
Feedback Input Bias
Current
nA
Note 1: Regulator SW pin is forced off for 240 ns every 8 cycles to ensure the BOOST cap is replenished.
© 2011 Microchip Technology Inc.
DS22285A-page 3
MCP16321/2
DC CHARACTERISTICS (CONTINUED)
Electrical Characteristics: Unless otherwise indicated, TA = +25°C, VIN = 12V, VOUT = 3.3V, IOUT = 300 mA,
L = 4.7 µH, COUT = 2x22 µF, CIN = 2x10 µF. Boldface specifications apply over the TJ range of -40°C to +125°C.
Parameters
Sym
Min
Typ
Max
Units
Conditions
PFM Mode Feedback
EN Input Characteristics
EN Input Logic High
VFB-PFM
—
VOUT + 1%
—
V
VIH
VIL
2.2
—
—
—
—
—
—
—
—
0.8
—
—
—
—
V
V
EN Input Logic Low
EN Input Hysteresis
VEN-HYST
IENLK
480
3.5
-1.5
4
mV
EN Input Leakage Current
µA VEN = 5V
µA VEN = 0V
ms
Soft-Start Time
tSS
Switching Characteristics
Switching Frequency
fSW
0.9
95
1
1.1
99
MHz Open Loop VFB
Low
Maximum Duty Cycle
DCMAX
97
%
Open Loop VFB
Low
Note 1
Minimum Duty Cycle
—
—
7
—
—
%
NMOS Low-Side
Low-Side RDS(ON)
120
mΩ
Switch On Resistance
NMOS High-Side
Switch On Resistance
High-Side
RDS(ON)
—
180
—
mΩ
NMOS High-Side
Switch Current Limit
IN(MAX)
1.4
2.4
1.8
2.8
2.4
3.4
A
A
MCP16321
MCP16322
PG Output Characteristics
PG Low-level
Output Voltage
PGIL
—
—
—
—
0.5
10
0.01
V
IPG = -0.3 mA
PG High-Level Output Leak-
age Current
IPGLK
—
µA VPG = 5V
ms
PG Release Timer
tPG
—
95% VOUT
—
VOUT Undervoltage Threshold
VOUT-UV
91% VOUT 93% VOUT
VOUT Undervoltage
Hysteresis
VOUT-UV_HYST
—
—
—
1.5% VOUT
103% VOUT
1% VOUT
V
OUT Overvoltage
Threshold
OUT Overvoltage
VOUT-OV
—
—
V
VOUT-OV_HYST
Hysteresis
Thermal Characteristics
Thermal Shutdown
Die Temperature
TSD
—
—
170
10
—
—
°C
°C
Die Temperature
Hysteresis
TSDHYS
Note 1: Regulator SW pin is forced off for 240 ns every 8 cycles to ensure the BOOST cap is replenished.
DS22285A-page 4
© 2011 Microchip Technology Inc.
MCP16321/2
TABLE 1-1:
TEMPERATURE CHARACTERISTICS
Electrical Characteristics
Parameters
Sym
Min
Typ
Max
Units
Conditions
Temperature Ranges
Operating Junction Temperature
Range
TJ
-40
—
125
°C
Steady State
Storage Temperature Range
TA
TJ
-65
—
—
—
150
150
°C
°C
Maximum Junction Temperature
Package Thermal Resistances
Thermal Resistance, 16L 3x3-QFN
Transient
θJA
—
38.5
—
°C/W Note 1
Note 1: Measured using a 4-layer FR4 Printed Circuit Board with a 13.5 in2, 1 oz internal copper ground plane.
© 2011 Microchip Technology Inc.
DS22285A-page 5
MCP16321/2
NOTES:
DS22285A-page 6
© 2011 Microchip Technology Inc.
MCP16321/2
2.0
TYPICAL PERFORMANCE CURVES
Note:
The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
Note: Unless otherwise indicated, VIN = 12V, EN = Floating (Internally pulled up), CIN = 20 µF, COUT = 2x22 µF,
L = 4.7 µH (XAL6060-472MEB), ILOAD = 200 mA, TA = +25°C. MCP16321 maximum output current = 1A.
100
95
90
85
80
75
70
65
60
55
50
100
90
80
70
60
50
40
VIN = 6V
VIN = 6V
VIN = 12V
VIN = 18V
VIN = 24V
VIN = 12V
VIN = 18V
VOUT = 5V
VOUT = 1.8V
0.0
0.4
0.8
1.2
IOUT (A)
1.6
2.0
0
0.4
0.8
1.2
IOUT (A)
1.6
2
FIGURE 2-1:
5V VOUT Efficiency vs. IOUT
.
FIGURE 2-4:
IOUT
1.8V VOUT Efficiency vs.
.
90
85
80
75
70
65
60
55
50
45
40
95
VIN = 6V
VIN = 6V
90
85
80
75
70
65
60
VIN = 12V
VIN = 12V
VIN = 18V
VIN = 18V
VOUT = 3.3V
VOUT = 1.5V
VIN = 24V
55
50
0
0.4
0.8
1.2
IOUT (A)
1.6
2
0
0.4
0.8
1.2
IOUT (A)
1.6
2
FIGURE 2-2:
3.3V VOUT Efficiency vs.
FIGURE 2-5:
1.5V VOUT Efficiency vs.
IOUT.
IOUT.
100
90
100
VIN = 6V
90
80
70
60
50
40
VIN = 6V
80
70
60
50
40
VIN = 12V
VIN = 8V
VIN = 18V
VOUT = 0.9V
VOUT = 2.5V
VIN = 24V
VIN = 10V
0.4
0
0.4
0.8
1.2
IOUT (A)
1.6
2
0
0.8
1.2
IOUT (A)
1.6
2
FIGURE 2-3:
2.5V VOUT Efficiency vs.
FIGURE 2-6:
0.9V VOUT Efficiency vs.
IOUT.
IOUT.
© 2011 Microchip Technology Inc.
DS22285A-page 7
MCP16321/2
Note: Unless otherwise indicated, VIN = 12V, EN = Floating (Internally pulled up), CIN = 20 µF, COUT = 2x22 µF,
L = 4.7 µH (XAL6060-472MEB), ILOAD = 200 mA, TA = +25°C. MCP16321 maximum output current = 1A.
5.04
5.03
5.02
5.01
5
1.808
1.807
1.806
1.805
1.804
1.803
1.802
1.801
1.8
VOUT = 5V
VOUT =1.8V
VIN = 6V
VIN = 6V
VIN = 12V
VIN = 12V
VIN = 18V
1.6
VIN = 24V
4.99
4.98
VIN = 18V
1.799
1.798
0
0.4
0.8
1.2
IOUT (A)
2
2
2
0
0.4
0.8
IOUT (A)
1.2
1.6
2
FIGURE 2-7:
5V VOUT vs. IOUT.
FIGURE 2-10:
1.8V VOUT vs. IOUT.
3.32
3.315
3.31
1.505
1.504
1.503
1.502
1.501
1.5
VOUT =1.5V
VOUT =3.3V
VIN = 6V
VIN = 6V
3.305
3.3
VIN = 12V
VIN = 12V
VIN = 16V
1.499
VIN = 18V
VIN = 24V
1.2
3.295
0
1.498
0
0.4
0.8
IOUT (A)
1.6
0.4
0.8
IOUT (A)
1.2
1.6
2
FIGURE 2-8:
3.3V VOUT vs. IOUT.
FIGURE 2-11:
1.5V VOUT vs. IOUT.
2.515
2.513
2.511
2.509
2.507
2.505
2.503
2.501
2.499
2.497
2.495
0
0.904
0.903
0.902
0.901
0.9
VOUT =0.9V
VOUT =2.5V
VIN = 6V
VIN = 6V
VIN = 12V
VIN = 8V
0.899
0.898
VIN = 10V
1.2
VIN = 24V
VIN = 18V
1.6
0.897
0
0.4
0.8
IOUT (A)
1.2
0.4
0.8
1.6
2
IOUT (A)
FIGURE 2-9:
2.5V VOUT vs. IOUT.
FIGURE 2-12:
0.9V VOUT vs. IOUT.
DS22285A-page 8
© 2011 Microchip Technology Inc.
MCP16321/2
Note: Unless otherwise indicated, VIN = 12V, EN = Floating (Internally pulled up), CIN = 20 µF, COUT = 2x22 µF,
L = 4.7 µH (XAL6060-472MEB), ILOAD = 200 mA, TA = +25°C. MCP16321 maximum output current = 1A.
5.02
5.015
5.01
5.005
5
1.804
1.803
1.802
1.801
1.8
VOUT = 1.8V
VOUT = 5V
IOUT = 1A
IOUT = 1A
4.995
4.99
4.985
IOUT = 2A
1.799
1.798
IOUT = 2A
6
8
10
12
VIN (V)
14
16
18
6
8
10 12 14 16 18 20 22 24
VIN (V)
FIGURE 2-13:
5V VOUT vs VIN.
FIGURE 2-16:
1.8V VOUT vs VIN.
1.503
1.5025
1.502
1.5015
1.501
1.5005
1.5
3.31
3.308
3.306
3.304
3.302
3.3
VOUT = 3.3V
VOUT = 1.5V
IOUT = 2A
IOUT = 1A
IOUT = 1A
3.298
3.296
3.294
1.4995
1.499
IOUT = 2A
1.4985
6
8
10
VOUT (V)
12
14
16
6
8
10 12 14 16 18 20 22 24
VIN (V)
FIGURE 2-14:
3.3V VOUT vs VIN.
FIGURE 2-17:
1.5V VOUT vs VIN.
0.9012
0.901
2.506
2.505
2.504
2.503
2.502
2.501
2.5
2.499
2.498
2.497
2.496
6
VOUT = 2.5V
VOUT = 0.9V
0.9008
0.9006
0.9004
0.9002
0.9
IOUT = 1A
IOUT = 1A
0.8998
0.8996
IOUT = 2A
IOUT = 2A
0.8994
6
8
10 12 14 16 18 20 22 24
VIN (V)
7
8
9
10
VIN (V)
FIGURE 2-15:
2.5V VOUT vs VIN.
FIGURE 2-18:
0.9V VOUT vs VIN.
© 2011 Microchip Technology Inc.
DS22285A-page 9
MCP16321/2
Note: Unless otherwise indicated, VIN = 12V, EN = Floating (Internally pulled up), CIN = 20 µF, COUT = 2x22 µF,
L = 4.7 µH (XAL6060-472MEB), ILOAD = 200 mA, TA = +25°C. MCP16321 maximum output current = 1A.
8
7
6
5
4
3
2
1
0
1020
1015
1010
1005
1000
995
990
985
980
6
10
14
VIN (V)
18
22
-40
-10
20
50
80
110
Ambient Temperature (°C)
FIGURE 2-19:
Shutdown Current vs. Input
FIGURE 2-22:
Oscillator Frequency vs.
Voltage.
Temperature (IOUT = 300 mA).
5.50
5.45
4.90
4.85
4.80
4.75
4.70
4.65
4.60
4.55
4.50
4.45
-40
IOUT = 0A
5.40
5.35
5.30
5.25
5.20
-10
20
50
80
110
-40
-10
20
50
80
110
Ambient Temperature (°C)
Ambient Temperature (°C)
FIGURE 2-20:
Shutdown Current vs.
FIGURE 2-23:
Input Quiescent Current vs.
Temperature.
Temperature (No Load, Switching).
2.42
2.40
3.300
3.298
3.296
3.294
3.292
3.290
3.288
3.286
IOUT = 0.1A
IOUT = 0A
2.38
IOUT = 1A
2.36
2.34
2.32
2.30
2.28
3.284
-40
-10
20
50
80
110
-40
-10
20
50
80
110
Ambient Temperature (°C)
Ambient Temperature (°C)
FIGURE 2-21:
Output Voltage vs.
FIGURE 2-24:
Input Current vs.
Temperature.
Temperature (No Load, No Switching).
DS22285A-page 10
© 2011 Microchip Technology Inc.
MCP16321/2
Note: Unless otherwise indicated, VIN = 12V, EN = Floating (Internally pulled up), CIN = 20 µF, COUT = 2x22 µF,
L = 4.7 µH (XAL6060-472MEB), ILOAD = 200 mA, TA = +25°C. MCP16321 maximum output current = 1A.
VOUT = 3.3V
OUT = 200 mA
VIN = 12V
30
25
20
15
10
5
Typical Mininimum Duty Cycle = 7%
I
0
0.9
1.2
1.5
VOUT (V)
1.8
2.1
FIGURE 2-25:
Maximum VIN to VOUT Ratio
FIGURE 2-28:
Startup From Enable.
for Continuous Switching.
VOUT = 3.3V
IOUT = 50 mA
VIN = 12V
VOUT = 3.3V
IOUT = 200 mA
VIN = 12V
FIGURE 2-26:
Light Load Switching
FIGURE 2-29:
Startup From VIN.
Waveforms.
VOUT = 3.3V
VOUT = 3.3V
IOUT = 500 mA
VIN = 12V
IOUT = 100 mA to 600 mA
VIN = 12V
FIGURE 2-27:
Heavy Load Switching
FIGURE 2-30:
Load Transient Response.
Waveforms.
© 2011 Microchip Technology Inc.
DS22285A-page 11
MCP16321/2
Note: Unless otherwise indicated, VIN = 12V, EN = Floating (Internally pulled up), CIN = 20 µF, COUT = 2x22 µF,
L = 4.7 µH (XAL6060-472MEB), ILOAD = 200 mA, TA = +25°C. MCP16321 maximum output current = 1A.
VOUT = 3.3V
IOUT = 200 mA
VIN = 6V to 10V
FIGURE 2-31:
Line Transient Response.
DS22285A-page 12
© 2011 Microchip Technology Inc.
MCP16321/2
3.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
PIN FUNCTION TABLE
Symbol
MCP16321/2
3x3 QFN
Description
1
2
3
4
5
SW
VIN
Output switch node, connects to the inductor and the bootstrap capacitor
Input supply voltage pin for power and internal biasing
Input supply voltage pin for power and internal biasing
Primary signal ground
VIN
SGND
VFB
Output voltage feedback pin. Connect VFB to VOUT for fixed version and output
resistor divider for adjustable version.
6
7
8
9
NC
NC
PG
EN
No Connection
No Connection
Power Good open-drain output, pulled up to a maximum of 6V
Enable input pin. Logic high enables the operation. Internally pulled up, pull EN pin
low to disable regulator’s output. Maximum voltage on EN input is 6V.
10
BOOST
Boost voltage that drives the internal NMOS control switch. A bootstrap capacitor
is connected between the BOOST and SW pins.
11
12
13
14
15
16
17
VIN
SW
Input supply voltage pin for power and internal biasing
Output switch node, connects to the inductor and the bootstrap capacitor
Output switch node, connects to the inductor and the bootstrap capacitor
GND supply for the internal low-side NMOS/integrated diode
GND supply for the internal low-side NMOS/integrated diode
Output switch node, connects to the inductor and the bootstrap capacitor
Exposed Thermal Pad (EP); must be connected to GND
SW
PGND
PGND
SW
EP
3.1
Switch Pin (SW)
3.3
Signal Ground Pin (S
)
GND
The drain of the low-side N-Channel switch is
connected internally to the source of the high-side
N-Channel switch, and externally to the SW node,
consisting of the inductor and bootstrap capacitor. The
SW node can rise very fast as a result of the internal
high-side switch turning on. It should be connected
directly to the 4.7 µH inductor with a wide, short trace.
This ground is used for the majority of the device,
including the analog reference, control loop, and other
circuits.
3.4
Feedback Voltage Pin (V
)
FB
The VFB input pin is used to provide output voltage
regulation by either using a resistor divider or VOUT
directly. For the adjustable version, the VFB will be 0.9V
typical with the output voltage in regulation. For the
fixed version, the VFB will be equal to the
corresponding VOUT value.
3.2
Power Supply Input Voltage Pin
(V )
IN
Connect the input voltage source to VIN. The input
source should be decoupled to GND using 2 x 10 µF
capacitors. The amount of the capacitance depends on
the impedance of the source and output current. The
input capacitors provide AC current for the high-side
power switch and a stable voltage source for the
internal device power. This capacitor should be
connected as close as possible to the VIN and GND
pins.
3.5
Power Good Pin (PG)
PG is an open drain, active low output. The regulator
output voltage is monitored and the PG line will remain
low until the output voltage reaches the VOUT-UV
threshold. Once the internal comparator detects that
the output voltage is above the VOUT-UV threshold, an
internal delay timer is activated. After a 10 ms delay,
the PG open drain output pin can be pulled high,
indicating that the output voltage is in regulation. The
maximum voltage applied to the PG output pin should
not exceed 6V.
© 2011 Microchip Technology Inc.
DS22285A-page 13
MCP16321/2
3.6
Enable Pin (EN)
The EN input pin is a logic-level input used to enable or
disable the device. A logic high (> 2.2V) will enable the
regulator output, while a logic low (< 0.8V) will ensure
that the regulator is disabled. This pin is internally
pulled up to an internal reference and will be enabled
when VIN > UVLO, unless the EN pin is pulled low. The
maximum input voltage applied to the EN pin should
not exceed 6V.
3.7
BOOST Pin (BOOST)
This pin will provide the bootstrap voltage required for
driving the upper internal NMOS switch of the buck
regulator. An external ceramic capacitor placed
between the BOOST input pin and the SW pin will
provide the necessary drive voltage for the upper
switch. During steady state operation, the capacitor is
recharged on every low-side, synchronous switching
cycle. If the Switch mode approaches 100% duty cycle
for the high-side MOSFET, the device will automatically
reduce the duty cycle switch to a minimum off time of
240 ns on every 8th cycle to recharge the boost
capacitor.
3.8
Power Ground Pin (P
)
GND
This is a separate ground connection used for the low-
side synchronous switch to isolate switching noise from
the rest of the device.
3.9
Exposed Thermal Pad (EP)
There is no internal electrical connection between the
Exposed Thermal Pad (EP) and the PGND and SGND
pins. The EP must be connected to GND on the Printed
Circuit Board (PCB).
DS22285A-page 14
© 2011 Microchip Technology Inc.
MCP16321/2
4.1.4
ENABLE INPUT
4.0
4.1
DETAILED DESCRIPTION
Device Overview
The enable input (EN) is used to disable the device. If
disabled, the device consumes a minimal current from
the input. Once enabled, the internal soft start controls
the output voltage rate of rise, preventing high-inrush
current and output voltage overshoot. The EN is
internally pulled up or enabled; to disable the converter,
it must be pulled low.
The MCP16321/2 is a high-input voltage, step-down
regulator, capable of supplying 1A/2A to a regulated
output voltage from 0.9V to 5V. Internally, the 1 MHz
oscillator provides a fixed frequency, while the Peak
Current Mode Control architecture varies the duty cycle
for output voltage regulation. An internal floating driver
is used to turn the high-side integrated N-Channel
MOSFET on and off. The power for this driver is
derived from an external boost capacitor whose energy
is replenished when the low-side N-Channel MOSFET
is turned on. When the maximum duty cycle
approaches 100%, the boost capacitor is replenished
for 240 ns after every 8 cycles.
4.1.5
SOFT START
The internal reference voltage rate of rise is controlled
during startup, minimizing the output voltage overshoot
and the inrush current.
4.1.6
OUTPUT OVER VOLTAGE
PROTECTION
If the output of the regulator exceeds 103% of the
regulation voltage, the SW outputs will tri-state to
protect the device from damage. This check occurs at
the start of each switching cycle.
4.1.1
INTERNAL REFERENCE VOLTAGE
VREF
For the adjustable version, an integrated precise 0.9V
reference combined with an external resistor divider
sets the desired converter output voltage. The resistor
divider can vary without affecting the control system
gain. High-value resistors consume less current, but
are more susceptible to noise. For the fixed version, an
integrated precise voltage reference is set to the
4.1.7
INPUT UNDER VOLTAGE LOCKOUT
An integrated Under Voltage Lockout (UVLO) prevents
the converter from starting until the input voltage is high
enough for normal operation. The converter will
typically start at 5.75V (typical) and operate down to
5.25V (typical). Hysteresis of 500 mV (typical) is added
to prevent starting and stopping during startup, as a
result of loading the input voltage source.
desired VOUT value and is directly connected to VOUT
.
4.1.2 INTERNAL COMPENSATION
All control system components necessary for stable
operation over the entire device operating range are
integrated, including the error amplifier and inductor
current slope compensation.
4.1.8
MINIMUM DUTY CYCLE
A minimum duty cycle of 70 ns typical prevents the
device from constant switching for high step-down
voltage ratios. Duty cycles less than this minimum will
initiate pulse skipping to maintain output voltage
regulation, resulting in higher output voltage ripple.
Duty cycle for continuous inductor current operation is
approximated by VOUT/VIN. For a 1 MHz switching
frequency or 1 µs period, this results in a 7% duty cycle
minimum. Maximum VIN for continuous switching can
be approximated dividing VOUT by the minimum duty
cycle or 7%. For example, the maximum input voltage
for continuous switching for a 1.5V output is equal to
approximately 21V.
4.1.3
EXTERNAL COMPONENTS
External components consist of:
• Input capacitor
• Output filter (inductor and capacitor)
• Boost capacitor
• Resistor divider (adjustable version only)
The selection of the external inductor, output capacitor,
input capacitor and boost capacitor is dependent upon
the output voltage and the maximum output current.
© 2011 Microchip Technology Inc.
DS22285A-page 15
MCP16321/2
4.1.9
OVERTEMPERATURE
PROTECTION
Overtemperature protection limits the silicon die
temperature to +170°C by turning the converter off. The
normal switching resumes at +160°C.
VIN
CIN
UV
Protection
VOUT
EN
OTEMP
Protection
Monitor and
Control
BOOST
Voltage
4.2V
PG
Current
Limit
VOUT
RTOP
Slope
Comp
BOOST
OV
Protection
FB
+
+
CS
RBOT
CBOOST
VREF and
Softstart
+
+
COMP
HS
Drive
Amp
-
-
PWM
Comparator
L
VOUT
SW
Gate Drive
Control
Internal Bias
Compensation
1 MHz
Oscillator
LS
COUT
Drive
-
COMP
+
VREF
PFM
Comparator
SGND
PGND
FIGURE 4-1:
MCP16321/2 Block Diagram.
DS22285A-page 16
© 2011 Microchip Technology Inc.
MCP16321/2
4.2
Functional Description
L
VOUT
4.2.1
STEP-DOWN OR BUCK
CONVERTER
S1
IL
The MCP16321/2 is a synchronous, step-down or buck
converter capable of stepping input voltages ranging
from 6V to 24V down to 0.9V to 5V.
COUT
VIN
S2
The integrated high-side switch is used to chop or
modulate the input voltage using a controlled duty cycle
for output voltage regulation. The integrated low-side
switch is used to freewheel current when the high-side
switch is turned off. High efficiency is achieved by using
low-resistance switches and low equivalent series
resistance (ESR), inductor and capacitors. When the
high-side switch is turned on, a DC voltage is applied to
the inductor (VIN – VOUT), resulting in a positive linear
ramp of inductor current. When the high-side switch
turns off and the low-side switch turns on, the applied
inductor voltage is equal to –VOUT, resulting in a
negative linear ramp of inductor current. In order to
ensure there is no shoot-through current, a dead time
where both switches are off is implemented between
the high-side switch turning off and the low-side switch
turning on, and the low-side switch turning off and the
high-side switch turning on.
IL
IOUT
VIN
SW
VOUT
S1 ON
S2 ON
Continuous Inductor Current Mode
For steady-state, continuous inductor current
operation, the positive inductor current ramp must
equal the negative current ramp in magnitude. While
operating in steady state, the switch duty cycle must be
equal to the relationship of VOUT/VIN for constant
output voltage regulation, under the condition that the
inductor current is continuous, or never reaches zero.
For discontinuous inductor current operation, the
steady-state duty cycle will be less than VOUT/VIN to
maintain voltage regulation. When the inductor current
reaches zero, the low-side switch is turned off so that
current does not flow in the reverse direction, keeping
the efficiency high. The average of the chopped input
voltage or SW node voltage is equal to the output
voltage, while the average inductor current is equal to
the output current.
IL
IOUT
VIN
SW
S2 Both
ON OFF
S1 ON
Discontinuous Inductor Current Mode
FIGURE 4-2:
Converter.
Synchronous Step-Down
© 2011 Microchip Technology Inc.
DS22285A-page 17
MCP16321/2
4.2.2
PEAK CURRENT MODE CONTROL
4.2.4
HIGH-SIDE DRIVE
The MCP16321/2 integrates a Peak Current Mode
Control architecture, resulting in superior AC regulation
while minimizing the number of voltage loop
compensation components, and their size, for
integration. Peak Current Mode Control takes a small
portion of the inductor current, replicates it and
compares this replicated current sense signal with the
output of the integrated error voltage. In practice, the
inductor current and the internal switch current are
equal during the switch-on time. By adding this peak
current sense to the system control, the step-down
power train system can be approximated by a 1st order
system rather than a 2nd order system. This reduces
the system complexity and increases its dynamic
performance.
The MCP16321/2 features an integrated high-side
N-Channel MOSFET for high efficiency step-down
power conversion. An N-Channel MOSFET is used for
its low resistance and size (instead of a P-Channel
MOSFET). The N-Channel MOSFET gate must be
driven above its source to fully turn on the device,
resulting in a gate-drive voltage above the input to turn
on the high-side N-Channel. The high-side N-Channel
source is connected to the inductor and boost cap or
switch node. When the high-side switch is off and the
low-side is on, the inductor current flows through the
low-side switch, providing a path to recharge the boost
cap from the boost voltage source. An internal boost-
blocking diode is used to prevent current flow from the
boost cap back into the output during the internal
switch-on time. Prior to startup, the boost cap has no
stored charge to drive the switch. An internal regulator
is used to “pre-charge” the boost cap. Once pre-
charged, the switch is turned on and the inductor
current flows. When the high-side switch turns off and
the low-side turns on, current freewheels through the
inductor and low-side switch, providing a path to
recharge the boost cap. When the duty cycle
approaches its maximum value, there is very little time
for the boost cap to be recharged due to the short
amount time that the low-side switch is on. Therefore,
when the maximum duty cycle approaches, the switch
node is forced off for 240 ns every 8 cycles to ensure
that the boost cap gets replenished.
For Pulse-Width Modulation (PWM) duty cycles that
exceed 50%, the control system can become bimodal,
where a wide pulse followed by a short pulse repeats
instead of the desired fixed pulse width. To prevent this
mode of operation, an internal compensating ramp is
summed into the current sense signal.
4.2.3
PULSE WIDTH MODULATION
(PWM)
The internal oscillator periodically starts the switching
period, which in the MCP16321/2’s case occurs every
1 µs or 1 MHz. With the high-side integrated
N-Channel MOSFET turned on, the inductor current
ramps up until the sum of the current sense and slope
compensation ramp exceeds the integrated error
amplifier output. Once this occurs, the high-side switch
turns off and the low-side switch turns on. The error
amplifier output slews up or down to increase or
decrease the inductor peak current feeding into the
output LC filter. If the regulated output voltage is lower
than its target, the inverting error amplifier output rises.
This results in an increase in the inductor current to
correct for errors in the output voltage. The fixed
frequency duty cycle is terminated when the sensed
inductor peak current, summed with the internal slope
compensation, exceeds the output voltage of the error
amplifier. The PWM latch is set by turning off the high-
side internal switch and preventing it from turning on
until the beginning of the next cycle.
DS22285A-page 18
© 2011 Microchip Technology Inc.
MCP16321/2
5.0.3
GENERAL DESIGN EQUATIONS
5.0
APPLICATION INFORMATION
The step-down converter duty cycle can be estimated
using Equation 5-2 while operating in Continuous
Inductor Current Mode. This equation accounts for the
forward drop of two internal N-Channel MOSFETS. As
load current increases, the voltage drop in both internal
switches will increase, requiring a larger PWM duty
cycle to maintain the output voltage regulation. Switch
voltage drop is estimated by multiplying the switch
5.0.1
TYPICAL APPLICATIONS
The MCP16321/2 synchronous step-down converter
operates over a wide input range, up to 24V maximum.
Typical applications include generating a bias or VDD
voltage for PIC® microcontrollers, digital control system
bias supply for AC-DC converters and 12V industrial
input and similar applications.
current times the switch resistance or RDSON
.
5.0.2
ADJUSTABLE OUTPUT VOLTAGE
CALCULATIONS
EQUATION 5-2:
CONTINUOUS INDUCTOR
CURRENT DUTY CYCLE
To calculate the resistor divider values for the
MCP16321/2 adjustable version, use Equation 5-1.
RTOP is connected to VOUT, RBOT is connected to
SGND, and both are connected to the VFB input pin.
VOUT + (ILSW × RDSONL
D = ------------------------------------------------------------
IN – (IHSW × RDSONH
)
)
V
5.0.4
INPUT CAPACITOR SELECTION
EQUATION 5-1:
RESISTOR DIVIDER
CALCULATION
The step-down converter input capacitor must filter the
high-input ripple current, as a result of pulsing or
chopping the input voltage. The MCP16321/2 input
voltage pin is used to supply voltage for the power train
and as a source for internal bias. A low equivalent
RTOP
⎛
⎞
⎠
VOUT = VFB × 1 +------------
⎝
RBOT
series resistance (ESR), preferably
capacitor, is recommended. The
a
ceramic
necessary
EXAMPLE 5-1:
2.0V RESISTOR DIVIDER
capacitance is dependent upon the maximum load
current and source impedance. Three capacitor
parameters to keep in mind are the voltage rating,
equivalent series resistance and the temperature
rating. For wide temperature range applications, a
multilayer X7R dielectric is recommended, while for
VOUT = 2.0V
VFB = 0.9V
RBOT = 10 kΩ
RTOP = 12.2 kΩ (standard value = 12.3 kΩ)
VOUT = 2.007V (using standard values)
applications with limited temperature range,
a
multilayer X5R dielectric is acceptable. The input
capacitor voltage rating must be VIN plus margin.
EXAMPLE 5-2:
4.2V RESISTOR DIVIDER
VOUT = 4.2V
VFB = 0.9V
5.0.5
OUTPUT CAPACITOR SELECTION
The output capacitor provides a stable output voltage
during sudden load transients, and reduces the output
voltage ripple. As with the input capacitor, X5R and
X7R ceramic capacitors are well suited for this applica-
tion.
RBOT = 10 kΩ
RTOP = 36.7 kΩ (standard value = 36.5 kΩ)
VOUT = 4.185V (using standard values)
The error amplifier is internally compensated to ensure
loop stability. External resistor dividers, inductance and
output capacitance, all have an impact on the control
system and should be selected carefully and evaluated
for stability. A 10 kΩ resistor is recommended as a
good trade-off for quiescent current and noise
immunity.
The MCP16321/2 is internally compensated, so the
output capacitance range is limited. See TABLE 5-1:
“Capacitor Value Range” for the recommended out-
put capacitor range.
The amount and type of output capacitance and
equivalent series resistance will have a significant
effect on the output ripple voltage and system stability.
The range of the output capacitance is limited due to
the integrated compensation of the MCP16321/2.
The output voltage capacitor rating should be a
minimum of VOUT plus margin.
TABLE 5-1:
Parameter
CIN
CAPACITOR VALUE RANGE
Min
Max
8 µF
None
© 2011 Microchip Technology Inc.
DS22285A-page 19
MCP16321/2
TABLE 5-1:
Parameter
COUT
CAPACITOR VALUE RANGE
TABLE 5-2:
MCP16321 RECOMMENDED
INDUCTORS
Min
Max
33 µF
None
Size
Part
Number
Value DCR
ISAT
(A)
WxLxH
(mm)
(µH)
(Ω)
5.0.6
INDUCTOR SELECTION
Coilcraft®
1008PS
The MCP16321/2 is designed to be used with small
surface mount inductors. Several specifications should
be considered prior to selecting an inductor. To
optimize system performance, low ESR inductors
should be used.
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
0.35
0.175
0.125
0.15
1.7 3.81x3.78x2.74
LPS4012
LPS4018
LPS5015
MSS5121
LPS5030
MSS6122
MOS6020
1.8
1.9
1.8
4.1x4.1x1.2
4.1x4.1x1.8
5x5x1.5
EQUATION 5-3:
INDUCTOR CURRENT
RIPPLE
0.095 1.66
0.083
0.065 1.82
5.1x5.1x2.2
5x5x3
2
VL
6.1x6.1x2.2
6.8x6x2.4
ΔIL= ----- × tON
0.05
1.94
L
Wurth Elektronik®
744042
4.7
4.7
4.7
0.07
1.65
4.8x4.8x1.8
8x8x1.1
EXAMPLE 5-3:
MCP16321 PEAK
INDUCTOR CURRENT – 1A
744068
0.072 1.55
0.0545 4.2
7448944
EPCOS®
LTF5022T
VLC5020T
VLC6020T
8x8x3.8
VIN = 12V
VOUT = 3.3V
IOUT = 1A
4.7
4.7
4.7
0.073
0.097
0.079
0.122
0.12
2
5.2x5x2.2
5x5x2
2
L = 4.7 µH
1.8
1.7
1.7
6x6x2
VLCF5020T 4.7
5x5x2
ΔI
L
I
= --------- + I
VLF5014ST
4.7
4.8x4.6x1.4
LPK
OUT
2
Inductor ripple current = 509 mA
Inductor peak current = 1.255A
TABLE 5-3:
MCP16322 RECOMMENDED
INDUCTORS
An inductor saturation rating minimum of 1.255A is
recommended. A trade-off between size, cost and
efficiency is made to achieve the desired results.
Size
Value DCR ISAT
WxLxH
Part Number
(µH)
(Ω)
(A)
(mm)
Coilcraft®
EXAMPLE 5-4:
MCP16322 PEAK
INDUCTOR CURRENT – 2A
MSS6132-472
LPS6225-472
MSS7341-502
4.7
4.7
4.7
0.056 2.84
0.065 3.2
0.024 3.16
6.1x6.1x3.2
6.2x6.2x2.5
7.3x7.3x4.1
8.89x6.1x5.0
VIN = 12V
VOUT = 3.3V
IOUT = 2A
DO1813H-472 4.7
Wurth Elektronik®
0.054
2.6
L = 4.7 µH
7447785004
7447786004
7447789004
EPCOS®
4.7
4.7
4.7
0.06
0.057
0.033
2.5
2.8
3.9
5.9x6.2x3.3
5.9x6.2x5.1
7.3x3.2x1.5
ΔI
L
I
= --------- + I
LPK
OUT
2
Inductor ripple current = 509 mA
Inductor peak current = 2.255A
B82464G2
B82464A2
4.7
4.7
0.033
0.03
3.1 10.4x10.4x3.0
4.5 10.4x10.4x3.0
An inductor saturation rating minimum of 2.255A is
recommended. A trade-off between size, cost and
efficiency is made to achieve the desired results.
DS22285A-page 20
© 2011 Microchip Technology Inc.
MCP16321/2
5.0.7
BOOST CAPACITOR
EXAMPLE 5-5:
POWER DISSIPATION –
MCP16321
The boost capacitor is used to supply current for the
internal high-side drive circuitry that is above the input
voltage. The boost capacitor must store enough energy
to completely drive the high-side switch on and off. A
22 nF X5R or X7R capacitor is recommended for all
applications. The boost capacitor maximum voltage is
VIN
VOUT
IOUT
=
=
=
=
=
=
=
12V
5.0V
1A
Efficiency
92.5%
405 mW
0.04 Ω
40 mW
5.5V, so
recommended.
a
6.3V or 10V rated capacitor is
Total System Dissipation
LESR
PL
5.0.8
THERMAL CALCULATIONS
The MCP16321/2 is available in a 3x3 QFN-16
package. By calculating the power dissipation and
applying the package thermal resistance (θJA), the
junction temperature is estimated. The maximum
continuous junction temperature rating for the
MCP16321/2 is +125°C.
MCP16321 internal power dissipation estimate:
PDIS – PL
θJA
=
=
=
365 mW
38.5°C/W
+14.052°C
Estimated Junction
Note 1:
θJA = 38.5°C/W for a 4-layer FR4 Printed
Circuit Board with a 13.5 in2, 1 oz internal
copper ground plane.
To quickly estimate the internal power dissipation for
the switching step-down regulator, an empirical
calculation using measured efficiency can be used.
Given the measured efficiency, the internal power
dissipation is estimated in Equation 5-4. This power
dissipation includes all internal and external
component losses. For a quick internal estimate,
subtract the estimated inductor ESR loss from the PDIS
calculation in Equation 5-4.
2: A smaller ground plane will result in a
larger θJA temperature rise.
EXAMPLE 5-6:
POWER DISSIPATION –
MCP16322
VIN
=
=
=
=
=
=
=
12V
VOUT
3.3V
EQUATION 5-4:
TOTAL POWER
IOUT
2A
DISSIPATION ESTIMATE
Efficiency
87.5%
943 mW
0.04 Ω
160 mW
VOUT × IOUT
PDIS = ------------------------------ – (VOUT × IOUT
Efficency
Total System Dissipation
)
LESR
PL
The difference between the first term, input power, and
the second term, power delivered, is the total system
power dissipation. The inductor losses are estimated
MCP16322 internal power dissipation estimate:
PDIS – PL
θJA
=
=
=
783 mW
38.5°C/W
+30.14°C
by PL = IOUT2 x LESR
.
Estimated Junction
© 2011 Microchip Technology Inc.
DS22285A-page 21
MCP16321/2
frequency switch current, CIN also provides a stable
voltage source for the internal MCP16321/2 circuitry.
Unstable PWM operation can result if there are
excessive transients or ringing on the VIN pin of the
MCP16321/2 device. In Figure 5-1, CIN is placed close
to the VIN pins. A ground plane on the bottom of the
board provides a low resistive and low inductive path
for the return current. The next priority in placement is
the freewheeling current loop formed by COUT and L
while strategically placing the COUT return close to CIN
return. Next, CBOOST should be placed between the
boost pin and the switch node pin. This leaves space
close to the MCP16321/2 VFB pin to place RTOP and
RBOT. RTOP and RBOT are routed away from the switch
node so noise is not coupled into the high-impedance
VFB input.
5.0.9
PCB LAYOUT INFORMATION
Good printed circuit board layout techniques are
important to any switching circuitry, and switching
power supplies are no different. When wiring the
switching high-current paths, short and wide traces
should be used. Therefore, it is important that the input
and output capacitors be placed as close as possible to
the MCP16321/2 to minimize the loop area.
The feedback resistors and feedback signal should be
routed away from the switching node and the switching
current loop. When possible, ground planes and traces
should be used to help shield the feedback signal and
minimize noise and magnetic interference.
A good MCP16321/2 layout starts with CIN placement.
CIN supplies current to the input of the circuit when the
switch is turned on. In addition to supplying high-
Bottom layer is ground plane
VOUT
L
COUT
COUT
RPG 10Ω
CBOOST
GND
MCP16321/2
R
BOT RTOP
Trace on
bottom layer
CIN
CIN
VIN
GND
FIGURE 5-1:
Recommended Layout.
DS22285A-page 22
© 2011 Microchip Technology Inc.
MCP16321/2
CBOOST
VOUT
0.9V to 5V
L
BOOST
VIN
SW
6.0V to 24V
VIN
EN
10Ω
RTOP
COUT
VFB
VOUT
RPG
RBOT
CIN
PG
SGND
PGND
FIGURE 5-2:
TABLE 5-4:
Recommended Layout – Schematic.
RECOMMENDED LAYOUT
COMPONENTS
Component
CIN
Value
2 x 10 µF
2 x 22 µF
4.7 µH
36.5 kΩ
10 kΩ
COUT
L
RTOP
RBOT
RPG
10 kΩ
CBOOST
22 nF
© 2011 Microchip Technology Inc.
DS22285A-page 23
MCP16321/2
NOTES:
DS22285A-page 24
© 2011 Microchip Technology Inc.
MCP16321/2
6.0
6.1
PACKAGING INFORMATION
Package Marking Information
16-Lead QFN (3x3x0.9 mm)
Example
Part Number
Code
MCP16321T-150E/NG
MCP16321T-180E/NG
MCP16321T-250E/NG
MCP16321T-330E/NG
MCP16321T-500E/NG
MCP16321T-ADJE/NG
MCP16322T-150E/NG
MCP16322T-180E/NG
MCP16322T-250E/NG
MCP16322T-330E/NG
MCP16322T-500E/NG
MCP16322T-ADJE/NG
AAA
AAB
AAC
AAD
AAE
AAF
ABA
ABB
ABC
ABD
ABE
ABF
AAA
E114
5256
Legend: XX...X Customer-specific information
Y
Year code (last digit of calendar year)
YY
Year code (last 2 digits of calendar year)
WW
NNN
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code
e
3
Pb-free JEDEC designator for Matte Tin (Sn)
This package is Pb-free. The Pb-free JEDEC designator (
can be found on the outer packaging for this package.
*
)
3
e
Note: In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line, thus limiting the number of available
characters for customer-specific information.
© 2011 Microchip Technology Inc.
DS22285A-page 25
MCP16321/2
DS22285A-page 26
© 2011 Microchip Technology Inc.
MCP16321/2
© 2011 Microchip Technology Inc.
DS22285A-page 27
MCP16321/2
DS22285A-page 28
© 2011 Microchip Technology Inc.
MCP16321/2
APPENDIX A: REVISION HISTORY
Revision A (December 2011)
• Original Release of this Document.
© 2011 Microchip Technology Inc.
DS22285A-page 29
MCP16321/2
NOTES:
DS22285A-page 30
© 2011 Microchip Technology Inc.
MCP16321/2
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.
PART NO.
Device
T
X
/XX
-XXX
Examples:
a) MCP16321T-150E/NG:
Tape and Reel,
Tape and Reel
Temperature Package
Range
Output
Voltage
1.5V Output Voltage,
Extended Temperature
16LD QFN Package
b) MCP16321T-ADJE/NG: Tape and Reel,
Adjustable Output Voltage,
Device:
MCP16321T:
MCP16322T:
High-Efficiency Synchronous Buck
Regulator (Tape and Reel) (QFN)
High-Efficiency Synchronous Buck
Regulator (Tape and Reel) (QFN)
Extended Temperature
16LD QFN Package
Tape and Reel,
c) MCP16322T-150E/NG:
1.5V Output Voltage,
Extended Temperature
16LD QFN Package
Output Voltage
150
180
250
330
500
ADJ
=
=
=
=
=
=
1.5V
1.8V
2.5V
3.3V
5.0V
d) MCP16322T-ADJE/NG: Tape and Reel,
Adjustable Output Voltage,
Extended Temperature
16LD QFN Package
Adjustable
Temperature Range:
Package:
E
= -40°C to +125°C
NG = Plastic Quad Flat, No Lead Package
(3x3x0.9 mm Body) (QFN), 16-lead
© 2011 Microchip Technology Inc.
DS22285A-page 31
MCP16321/2
NOTES:
DS22285A-page 32
© 2011 Microchip Technology Inc.
Note the following details of the code protection feature on Microchip devices:
•
Microchip products meet the specification contained in their particular Microchip Data Sheet.
•
Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.
•
There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
•
•
Microchip is willing to work with the customer who is concerned about the integrity of their code.
Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
Information contained in this publication regarding device
applications and the like is provided only for your convenience
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
MICROCHIP MAKES NO REPRESENTATIONS OR
WARRANTIES OF ANY KIND WHETHER EXPRESS OR
IMPLIED, WRITTEN OR ORAL, STATUTORY OR
OTHERWISE, RELATED TO THE INFORMATION,
INCLUDING BUT NOT LIMITED TO ITS CONDITION,
QUALITY, PERFORMANCE, MERCHANTABILITY OR
FITNESS FOR PURPOSE. Microchip disclaims all liability
arising from this information and its use. Use of Microchip
devices in life support and/or safety applications is entirely at
the buyer’s risk, and the buyer agrees to defend, indemnify and
hold harmless Microchip from any and all damages, claims,
suits, or expenses resulting from such use. No licenses are
conveyed, implicitly or otherwise, under any Microchip
intellectual property rights.
Trademarks
The Microchip name and logo, the Microchip logo, dsPIC,
KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro, PICSTART,
32
PIC logo, rfPIC and UNI/O are registered trademarks of
Microchip Technology Incorporated in the U.S.A. and other
countries.
FilterLab, Hampshire, HI-TECH C, Linear Active Thermistor,
MXDEV, MXLAB, SEEVAL and The Embedded Control
Solutions Company are registered trademarks of Microchip
Technology Incorporated in the U.S.A.
Analog-for-the-Digital Age, Application Maestro, chipKIT,
chipKIT logo, CodeGuard, dsPICDEM, dsPICDEM.net,
dsPICworks, dsSPEAK, ECAN, ECONOMONITOR,
FanSense, HI-TIDE, In-Circuit Serial Programming, ICSP,
Mindi, MiWi, MPASM, MPLAB Certified logo, MPLIB,
MPLINK, mTouch, Omniscient Code Generation, PICC,
PICC-18, PICDEM, PICDEM.net, PICkit, PICtail, REAL ICE,
rfLAB, Select Mode, Total Endurance, TSHARC,
UniWinDriver, WiperLock and ZENA are trademarks of
Microchip Technology Incorporated in the U.S.A. and other
countries.
SQTP is a service mark of Microchip Technology Incorporated
in the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
© 2011, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
ISBN: 978-1-61341-865-9
Microchip received ISO/TS-16949:2009 certification for its worldwide
headquarters, design and wafer fabrication facilities in Chandler and
Tempe, Arizona; Gresham, Oregon and design centers in California
and India. The Company’s quality system processes and procedures
are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® code hopping
devices, Serial EEPROMs, microperipherals, nonvolatile memory and
analog products. In addition, Microchip’s quality system for the design
and manufacture of development systems is ISO 9001:2000 certified.
© 2011 Microchip Technology Inc.
DS22285A-page 33
Worldwide Sales and Service
AMERICAS
ASIA/PACIFIC
ASIA/PACIFIC
EUROPE
Corporate Office
2355 West Chandler Blvd.
Chandler, AZ 85224-6199
Tel: 480-792-7200
Fax: 480-792-7277
Technical Support:
http://www.microchip.com/
support
Asia Pacific Office
Suites 3707-14, 37th Floor
Tower 6, The Gateway
Harbour City, Kowloon
Hong Kong
Tel: 852-2401-1200
Fax: 852-2401-3431
India - Bangalore
Tel: 91-80-3090-4444
Fax: 91-80-3090-4123
Austria - Wels
Tel: 43-7242-2244-39
Fax: 43-7242-2244-393
Denmark - Copenhagen
Tel: 45-4450-2828
Fax: 45-4485-2829
India - New Delhi
Tel: 91-11-4160-8631
Fax: 91-11-4160-8632
France - Paris
Tel: 33-1-69-53-63-20
Fax: 33-1-69-30-90-79
India - Pune
Tel: 91-20-2566-1512
Fax: 91-20-2566-1513
Australia - Sydney
Tel: 61-2-9868-6733
Fax: 61-2-9868-6755
Web Address:
www.microchip.com
Germany - Munich
Tel: 49-89-627-144-0
Fax: 49-89-627-144-44
Japan - Osaka
Tel: 81-66-152-7160
Fax: 81-66-152-9310
Atlanta
Duluth, GA
Tel: 678-957-9614
Fax: 678-957-1455
China - Beijing
Tel: 86-10-8569-7000
Fax: 86-10-8528-2104
Italy - Milan
Tel: 39-0331-742611
Fax: 39-0331-466781
Japan - Yokohama
Tel: 81-45-471- 6166
Fax: 81-45-471-6122
China - Chengdu
Tel: 86-28-8665-5511
Fax: 86-28-8665-7889
Boston
Westborough, MA
Tel: 774-760-0087
Fax: 774-760-0088
Netherlands - Drunen
Tel: 31-416-690399
Fax: 31-416-690340
Korea - Daegu
Tel: 82-53-744-4301
Fax: 82-53-744-4302
China - Chongqing
Tel: 86-23-8980-9588
Fax: 86-23-8980-9500
Chicago
Itasca, IL
Tel: 630-285-0071
Fax: 630-285-0075
Spain - Madrid
Tel: 34-91-708-08-90
Fax: 34-91-708-08-91
Korea - Seoul
China - Hangzhou
Tel: 86-571-2819-3187
Fax: 86-571-2819-3189
Tel: 82-2-554-7200
Fax: 82-2-558-5932 or
82-2-558-5934
UK - Wokingham
Tel: 44-118-921-5869
Fax: 44-118-921-5820
Cleveland
Independence, OH
Tel: 216-447-0464
Fax: 216-447-0643
China - Hong Kong SAR
Tel: 852-2401-1200
Fax: 852-2401-3431
Malaysia - Kuala Lumpur
Tel: 60-3-6201-9857
Fax: 60-3-6201-9859
Dallas
Addison, TX
Tel: 972-818-7423
Fax: 972-818-2924
China - Nanjing
Tel: 86-25-8473-2460
Fax: 86-25-8473-2470
Malaysia - Penang
Tel: 60-4-227-8870
Fax: 60-4-227-4068
China - Qingdao
Tel: 86-532-8502-7355
Fax: 86-532-8502-7205
Philippines - Manila
Tel: 63-2-634-9065
Fax: 63-2-634-9069
Detroit
Farmington Hills, MI
Tel: 248-538-2250
Fax: 248-538-2260
China - Shanghai
Tel: 86-21-5407-5533
Fax: 86-21-5407-5066
Singapore
Tel: 65-6334-8870
Fax: 65-6334-8850
Indianapolis
Noblesville, IN
Tel: 317-773-8323
Fax: 317-773-5453
China - Shenyang
Tel: 86-24-2334-2829
Fax: 86-24-2334-2393
Taiwan - Hsin Chu
Tel: 886-3-5778-366
Fax: 886-3-5770-955
Los Angeles
China - Shenzhen
Tel: 86-755-8203-2660
Fax: 86-755-8203-1760
Taiwan - Kaohsiung
Tel: 886-7-536-4818
Fax: 886-7-330-9305
Mission Viejo, CA
Tel: 949-462-9523
Fax: 949-462-9608
China - Wuhan
Tel: 86-27-5980-5300
Fax: 86-27-5980-5118
Taiwan - Taipei
Tel: 886-2-2500-6610
Fax: 886-2-2508-0102
Santa Clara
Santa Clara, CA
Tel: 408-961-6444
Fax: 408-961-6445
China - Xian
Tel: 86-29-8833-7252
Fax: 86-29-8833-7256
Thailand - Bangkok
Tel: 66-2-694-1351
Fax: 66-2-694-1350
Toronto
Mississauga, Ontario,
Canada
China - Xiamen
Tel: 905-673-0699
Fax: 905-673-6509
Tel: 86-592-2388138
Fax: 86-592-2388130
China - Zhuhai
Tel: 86-756-3210040
Fax: 86-756-3210049
11/29/11
DS22285A-page 34
© 2011 Microchip Technology Inc.
相关型号:
MCP16322T-330E
24V Input, 1A/2A Output, High Efficiency Synchronous Buck Regulator with Power Good Indication
MICROCHIP
MCP16322T-500E
24V Input, 1A/2A Output, High Efficiency Synchronous Buck Regulator with Power Good Indication
MICROCHIP
MCP16322T-ADJE
24V Input, 1A/2A Output, High Efficiency Synchronous Buck Regulator with Power Good Indication
MICROCHIP
MCP16323
This chapter contains general information that will be useful to know before using the MCP16323 Evaluation Board. Items discussed in this chapter include:
MICROCHIP
MCP16323T-150E
18V Input, 3A Output, High Efficiency Synchronous Buck Regulator with Power Good Indication
MICROCHIP
MCP16323T-180E
18V Input, 3A Output, High Efficiency Synchronous Buck Regulator with Power Good Indication
MICROCHIP
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