MIC2225-4SYMTTR [MICROCHIP]
1A SWITCHING REGULATOR, 2200kHz SWITCHING FREQ-MAX, PDSO10, 2 X 2 MM, GREEN, MLF-10;型号: | MIC2225-4SYMTTR |
厂家: | MICROCHIP |
描述: | 1A SWITCHING REGULATOR, 2200kHz SWITCHING FREQ-MAX, PDSO10, 2 X 2 MM, GREEN, MLF-10 开关 光电二极管 |
文件: | 总15页 (文件大小:354K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
MIC2225
2MHz 600mA Synchronous Buck
Regulator with 300mA LDO
General Description
Features
The Micrel MIC2225 is a dual output regulator featuring a
high efficiency 2MHz PWM synchronous buck (step-down)
regulator and a 300mA LDO. The MIC2225 is an ultra-low
noise, small size, and high efficiency solution for portable
power applications, providing core and I/O supply rails for
applications like application processors, camera DSPs and
multimedia chipsets.
DC-DC Converter
• 2.7 to 5.5V supply voltage
• 2MHz PWM mode
• Output current to 600mA
• >95% efficiency
• 100% maximum duty cycle
• Fixed output voltage option down to 1V
• Ultra-fast transient response
• Stable with 2.2µF ceramic output capacitor
• Fully integrated MOSFET switches
• Micropower shutdown (1mA in shutdown)
• Thermal shutdown and current limit protection
• Pb-free 10-pin 2mm x 2mm Thin MLF® package
• –40°C to +125°C junction temperature range
LDO
In PWM mode, the MIC2225 operates with a constant
2MHz frequency. The MIC2225 switching regulator
operates from 2.7V to 5.5V input and features internal
power MOSFETs that can supply up to 600mA output
current in PWM mode.
The MIC2225 is available in the 10-pin 2mm x 2mm Thin
MLF® package with a junction operating range from –40°C
to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
• VIN range 2.7V to 5.5V
• 300mA output current
• Output voltage down to 0.8V
• Thermal shutdown protection
• Current limit protection
Applications
• Cellular phones
• PDAs
• USB peripherals
___________________________________________________________________________________________________________
Typical Application
1.8V Efficiency @ 25°C
100
2.7V
IN
90
80
70
60
50
40
30
20
10
0
5.5V
IN
3.6V
IN
0
0.1 0.2 0.3 0.4 0.5 0.6
LOAD CURRENT (A)
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
M9999-022008-D
February 2008
Micrel, Inc.
MIC2225
Ordering Information
Part Number
Marking
Voltage*
Temperature Range
Package
Lead Finish
Code
MIC2225-4KYMT
MIC2225-4MYMT
MIC2225-4OYMT
MIC2225-4SYMT
MIC2225-G4YMT
MIC2225-GFYMT
MIC2225-GJYMT
MIC2225-GMYMT
Note:
4TK
1.2V/2.6V
1.2V/2.8V
1.2V/2.9V
1.2V/3.3V
1.8V/1.2V
1.8V/1.5V
1.8V/2.5V
1.8V/2.8V
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
10-Pin 2x2 Thin MLF®
10-Pin 2x2 Thin MLF®
10-Pin 2x2 Thin MLF®
10-Pin 2x2 Thin MLF®
10-Pin 2x2 Thin MLF®
10-Pin 2x2 Thin MLF®
10-Pin 2x2 Thin MLF®
10-Pin 2x2 Thin MLF®
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
4TM
4TO
4TS
GT4
GTF
GTJ
GTM
MLF® is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
Other voltage options available. Please contact Micrel for details.
* Refers to nominal output voltage of DC/DC and LDO respectively.
Pin Configuration
AGND
LDO
BIAS
AVIN
FB
1
2
3
4
5
10 PGND
9
8
7
6
SW
VIN
ENLDO
EN
10-Pin 2mm x 2mm Thin MLF® (MT)
M9999-022008-D
February 2008
2
Micrel, Inc.
MIC2225
Pin Description
Pin Number
Pin Name
AGND
LDO
Pin Function
1
2
3
Analog (signal) Ground.
LDO Output (Output): Connect to a 2.2µF output capacitor.
BIAS
Internal circuit bias supply. Must be de-coupled to signal ground with a 0.1µF
capacitor and should not be loaded.
4
5
AVIN
FB
Analog Supply Voltage (Input): Supply voltage for the analog control circuitry
and LDO input power. Requires bypass capacitor to GND. It must be tied to
VIN.
Feedback. Input to the error amplifier. For the Adjustable option, connect to the
external resistor divider network to set the output voltage. For fixed output
voltage options, connect to VOUT and an internal resistor network sets the output
voltage.
6
7
EN
Enable (Input). Logic low will shut down the switching regulator reducing the
quiescent current to less than 5µA.
ENLDO
Enable LDO (Input): Logic low will shut down the LDO, reducing the quiescent
current to less than 5µA.
8
9
VIN
SW
Supply Voltage (Input): Supply voltage for the internal switches and drivers.
Switch (Output): Internal power MOSFET output switches.
Power Ground.
10
PGND
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February 2008
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Micrel, Inc.
MIC2225
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Voltage (VIN).......................................................+6V
Output Switch Voltage (VSW)..........................................+6V
Output Switch Current (ISW)..............................................1A
Logic Input Voltage (VEN,VLOWQ)........................–0.3V to VIN
Storage Temperature (Ts) .........................–60°C to +150°C
ESD Rating(3)..................................................................2kV
Supply Voltage (VIN)..................................... +2.7V to +5.5V
Logic Input Voltage (VEN,VLOWQ)........................ –0.3V to VIN
Junction Temperature (TJ) ........................–40°C to +125°C
Junction Thermal Resistance
Thin MLF-10L (θJA) ............................................90°C/W
Electrical Characteristics DC/DC(4)
VEN = VIN = 3.6V, L = 2.2µH; COUTDC/DC = 2.2µF, CLDO = 2.2µF; IOUTDC/DC = 100mA; CBIAS = 0.1µF
ENLDO = 0V; TJ = 25°C, bold values indicate –40°C < TJ < +125°C; unless noted.
V
Parameter
Condition
Min
Typ
2.55
70
Max
2.65
Units
V
UVLO Threshold
Rising input voltage during turn-on
2.45
UVLO Hysteresis
mV
µA
Switcher Ground Pin Current
ENLDO = 0V, VFB = GND ; IL=0mA
EN = 0V
850
1100
110
5
LDO Ground Pin Current
67
µA
µA
Ground Pin Current in
Shutdown
EN +ENLDO = 0V
0.2
Over-temperature Shutdown
160
23
°C
°C
Over-temperature Shutdown
Hysteresis
Enable Input Voltage
Logic Low
0.2
V
V
Logic High
1.0
Enable Input Current
VIL < 0.2V
0.1
0.1
50
1
1
µA
µA
µs
VIH > 1.0V
Turn-on Time
ILOAD = 5mA
Fixed Output Voltages
Nominal VOUT tolerance Io=50mA
–2
–3
+2
+3
%
%
Current Limit in PWM Mode
VFB = 0.9*VNOM
0.675
0.95
0.12
A
Output Voltage Line Regulation
VIN = 2.7V to 5.5V, ILOAD= 100mA
1
%
%
Output Voltage Load Regulation 20mA < ILOAD < 300mA
0.2
1.5
%
%
Maximum Duty Cycle
100
VFB ≤ 0.4V
PWM Switch ON-Resistance
I
I
SW = 150mA; VFB = 0.7VFB_NOM
SW = -150mA; VFB = 1.1VFB_NOM
0.4
0.4
Ω
Ω
Oscillator Frequency
1.8
2
2.2
MHz
M9999-022008-D
February 2008
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Micrel, Inc.
MIC2225
Electrical Characteristics LDO(4)
COUTLDO = 2.2µF, IOUTLDO = 100µA; TJ = 25°C, bold values indicate –40°C < TJ < +125°C; unless noted.
Parameter
Condition
Min
Typ
Max
Units
Input Voltage
Output Voltage Accuracy
2.7
–2.0
–3.0
5.5
+2.0
+3.0
V
%
%
%
µs
%
mV
dB
dB
Variation from nominal VOUT
Variation from nominal VOUT; –40°C to +125°C
VIN = VOUT +1V to 5.5V; IOUT = 100µA
ILOAD = 300mA
Line Regulation
Turn-on Time
0.2
30
Load Regulation
Dropout Voltage, Note 5
Ripple Rejection
IOUT = 100µA to 300mA @ VIN = VOUT + 1
IOUT = 300mA @ VIN = 2.7V
f = 1kHz; COUT = 2.2µF
f = 20kHz; COUT = 2.2µF
0.70
210
43
17
Current Limit
VOUT = 0V
400
mA
Output Voltage Noise
COUT = 2.2µF, 10Hz to 100kHz
470
µVRMS
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
4. Specification for packaged product only.
5. Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal value that is initially measured at
a 1V differential. For outputs below 2.7V, the dropout voltage is the input-to-output voltage differential with a minimum input voltage of 2.7V.
M9999-022008-D
February 2008
5
Micrel, Inc.
MIC2225
Typical Characteristics (DC-DC)
1.2V Efficiency @ –40°C
1.2V Efficiency @ 25°C
1.2V Efficiency @ 70°C
100
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
2.7V
IN
2.7VIN
2.7V
IN
90
3.6V
3.6V
IN
IN
3.6V
IN
80
70
60
50
40
30
20
10
0
5.5V
IN
5.5V
5.5V
IN
IN
0
0.1 0.2 0.3 0.4 0.5 0.6
LOAD CURRENT (A)
0
0.1 0.2 0.3 0.4 0.5 0.6
LOAD CURRENT (A)
0
0.1 0.2 0.3 0.4 0.5 0.6
LOAD CURRENT (A)
Quiescent Current
vs. Input Voltage
Quiescent Current
vs. Load Current
Enable Threshold
vs. Input Voltage
150
125
100
75
1200
1000
800
600
400
200
0
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
50
V
= 1.2V
OUT
LOAD = 0
ENLDO = 0V
V
OUT
= 1.2V
25
V
OUT
= 1.19V
EN = V
IN
ENLDO = 5V
EN = V
ENLDO = 0V
IN
0
2.5
3
3.5
4
4.5 5.5
5
30 40 50 60
2.5
3
3.5
4
4.5
5
5.5
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
LOAD CURRENT (mA)
Turn-On Time
vs. Input Voltage
Frequency
vs. Input Voltage
Peak Current Limit
vs. Input Voltage
100
90
80
70
60
50
40
30
20
10
0
2.9
2.7
2.5
2.3
2.1
1.9
1.7
1.5
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
V
= 1.19V
V
= 1.2V
OUT
OUT
V
= 1.2V
VLDO = 2.8V
ENLDO = 5V
LOAD = 0
ENLDO = V
OUT
EN = ENLDO = V
IN
IN
2.5
3
3.5
4
4.5
5
5.5
2.5
3
3.5
4
4.5
5
5.5
2.5
3
3.5
4
4.5
5
5.5
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
M9999-022008-D
February 2008
6
Micrel, Inc.
MIC2225
Typical Characteristics (LDO)
PSRR
Quiescent Current
vs. Input Voltage
Quiescent Current
vs. Load Current
70
90
80
70
60
50
40
30
20
10
0
80
78
76
74
72
70
68
66
64
62
60
60
100mA
60mA
50
300mA
40
30
20
10
0
100mA
10mA
0mA
V
V
= 1.7V
= 2.8V
= 2.2µF
IN
V
IN
= 3.6V
OUT
C
ENLDO = V
ENLDO = V
OUT
IN
IN
0.025 0.075 0.125 0.175 0.2250.275
LOAD CURRENT (A)
100
1K
10K
100K
0
1
2
3
4
5
FREQUENCY (Hz)
INPUT VOLTAGE (V)
Quiescent Current
vs. Temperature
Output Voltage
vs. Load Current
Output Voltage
vs. Temperature
125
100
75
50
25
0
3.00
2.95
2.90
2.85
2.80
2.75
2.70
2.65
2.60
2.55
2.50
3.00
2.95
2.90
2.85
2.80
2.75
2.70
2.65
2.60
2.55
2.50
50mA
100mA
1mA
V
IN
= 3.6V
ENLDO = V
Load = 1mA
IN
V
= 3.6V
IN
V
= 3.6V
IN
ENLDO = V
IN
ENLDO = V
IN
-40 -20
0
20 40 60 80 100 120
0.025 0.075 0.125 0.175 0.2250.275
LOAD CURRENT (A)
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
TEMPERATURE (°C)
Output Voltage
vs. Temperature
Dropout Voltage
vs. Load Current
Dropout Voltage
vs. Temperature
2.86
0.20
50
40
30
20
10
0
ENLDO = V
IN
2.84
2.82
2.8
0.18
0.16
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0
50mA
2.78
2.76
2.74
2.72
2.70
2.68
2.66
25mA
10mA
V
= 3.6V
IN
ENLDO = V
Load = 10mA
V
= 3.6V
IN
IN
1mA
ENLDO = V
IN
-40 -20
0
20 40 60 80 100 120
0
0.05 0.1 0.15 0.2 0.25 0.3
LOAD CURRENT (A)
-40 -20 0
20 40 60 80 100 120
TEMPERATURE (°C)
TEMPERATURE (°C)
Peak Current Limit
vs. Input Voltage
Turn-On Time
vs. Input Voltage
Enable Threshold
vs. Input Voltage
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
50
45
40
35
30
25
20
15
10
5
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
EN = ENLDO = V
ENLDO = V
IN
IN
LDO = 2.8V
4.5 5.5
INPUT VOLTAGE (V)
0
2.5
3
3.5
4
5
2.5
3
3.5
4
4.5
5
5.5
2.5
3
3.5
4
4.5
5
5.5
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
M9999-022008-D
February 2008
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Micrel, Inc.
MIC2225
Typical Characteristics (LDO) continued
Output Noise
Spectral Density
3.0
V
V
= 3.6V
= 3.3V
IN
OUT
2.5
2.0
1.5
1.0
0.5
0
C
C
= 2.2µF
= 0.1µF
OUT
BYP
Noise(10Hz–100kHz) = 169µV
RMS
10
100
1K
10K 100K 1M
FREQUENCY (Hz)
M9999-022008-D
February 2008
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Micrel, Inc.
MIC2225
Functional Characteristics
M9999-022008-D
February 2008
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Micrel, Inc.
MIC2225
Functional Diagram
VIN
AVIN
P-Channel
Current Limit
6
BIAS
HSD
SW
VOUT1
PWM
Control
Anti-Shoot
Through
COUT1
LSD
N-Channel
Current Limit
FB
EN
Bias,
UVLO,
Enable and
Soft
Control Logic
EA
Thermal
Shutdown
Start
ENLDO
1.0V
LDO
LDO Block
VOUT2
LDO
Current
Limit
EA
COUT2
1.0V
SGND
PGND
MIC2225 Block Diagram
M9999-022008-D
February 2008
10
Micrel, Inc.
MIC2225
Functional Description
VIN
BIAS
VIN provides power to the MOSFETs for the switch
mode regulator section, along with the current limiting
sensing. Due to the high switching speeds, it is
recommended that an 1µF capacitor be placed close to
VIN and the power ground (PGND) pin for bypassing.
Please refer to layout recommendations.
The BIAS pin supplies the power to the internal power to
the control and reference circuitry. The bias is powered
from AVIN through an internal 6Ω resistor. A small 0.1µF
capacitor is recommended for bypassing.
FB
The feedback pin (FB) provides the control path to
control the output. For fixed output, the controller
output is directly connected to the feedback (FB) pin.
AVIN
Analog VIN (AVIN) provides power to the LDO section
and the bias through an internal 6Ω resistor. AVIN and
VIN must be tied together. Careful layout should be
considered to ensure high frequency switching noise
caused by VIN is reduced before reaching AVIN.
SW
The switch (SW) pin connects directly to the inductor
and provides the switching current necessary to operate
in PWM mode. Due to the high speed switching on this
pin, the switch node should be routed away from
sensitive nodes.
LDO
The LDO pin is the output of the linear regulator and
needs to be connected to a 2.2µF output capacitor.
PGND
EN
Power ground (PGND) is the ground path for the high
current PWM mode. The current loop for the power
ground should be as small as possible and separate
from the Analog ground (AGND) loop. Refer to the layout
considerations for more details.
The enable pin provides a logic level control of the
output. In the off state, the supply current of the device is
greatly reduced (typically <1µA). Also, in the off state,
the output drive is placed in a "tri-stated" condition,
wherein both the high side P-channel MOSFET and the
low-side N-channel are in an “off” or non-conducting
state. Do not drive the enable pin above the supply
voltage.
SGND
Signal ground (SGND) is the ground path for the biasing
and control circuitry. The current loop for the signal
ground should be separate from the Power ground
(PGND) loop. Refer to the layout considerations for more
details.
ENLDO
The enable pin provides a logic level control of the LDO
output. In the off state, supply current of the device is
greatly reduced (typically <1µA). Do not drive the enable
pin above the supply voltage.
M9999-022008-D
February 2008
11
Micrel, Inc.
MIC2225
not recommended.
Application Information
In addition to a 2.2µF, a small 10nF is recommended
close to the load for high frequency filtering. Smaller
case size capacitors are recommended due to there
lower ESR and ESL.
The MIC2225 is a 600mA PWM and 300mA LDO dual
power supply. Both PWM output and LDO outputs are
independent and are controlled by EN and ENLDO pins
respectively. These enable pins are logic level
compatible.
Inductor Selection
The MIC2225 is designed for use with a 2.2µH inductor.
Proper selection should ensure that the inductor can
handle the maximum average and peak currents
required by the load. Maximum current ratings for the
inductor are generally given in two methods; permissible
DC current and saturation current. Permissible DC
current can be rated either for a 40°C temperature rise
or a 10% to 20% loss in inductance. Ensure that the
inductor selected can handle the maximum operating
current. When saturation current is specified, make sure
that there is enough margin so that the peak current will
not saturate the inductor. Peak inductor current can be
calculated as follows:
Input Capacitor
A minimum 1µF ceramic is recommended on the VIN pin
for bypassing. X5R or X7R dielectrics are recommended
for the input capacitor. Y5V dielectrics loose most of
their capacitance over temperature and are therefore,
not recommended.
A minimum 1µF is recommended for placement close to
the VIN and PGND pins for high frequency filtering.
Smaller case size capacitors are recommended due to
their lower ESR and ESL. Please refer to layout
recommendations for proper layout of the input
capacitor.
⎛
⎞
⎟
⎟
⎠
Output Capacitor
VOUT
VIN
⎜
VOUT 1−
⎜
Even though the MIC2225 is optimized for a 2.2µF
output capacitor, output capacitance can be varied from
1µF to 10µF. The MIC2225 utilizes Type III internal
compensation and utilizes an internal high frequency
zero to compensate for the double pole roll off of the LC
filter. For this reason, larger output capacitors can create
instabilities. X5R or X7R dielectrics are recommended
for the output capacitor. Y5V dielectrics lose most of
their capacitance over temperature and are therefore,
⎝
IPK = IOUT
+
2 × f × L
M9999-022008-D
February 2008
12
Micrel, Inc.
MIC2225
PCB Layout Recommendations
Top Layer
Bottom Layer
Note:
The above figures demonstrate the recommended layout for the MIC2225 fixed output option.
M9999-022008-D
February 2008
13
Micrel, Inc.
MIC2225
L1
MIC2225
VIN
0.47µH / 2.2µH
J1
VIN
5.5V Max
8
4
9
5
J3
SW
FB
VO1
C4
C1
2.2µF/
6.3V
R3
0
R1
10k
AVIN
2.2µF/
6.3V
JP1
1X2
J6
EN
6
EN
J7
ENLDO
J4
VO2
7
3
2
LDO
ENLDO
BIAS
C3
2.2µF/
6.3V
R2
10k
C2
0.1µF/
6.3V
PGND AGND
10
1
J5
GND
J2
GND
Schematic Diagram
Bill of Materials
Item
C1
C2
C3
C4
R1
R2
R3
L1
Part Number
C1608X5R0J225K
Manufacturer
TDK(1)
Vishay Vitramon(2)
TDK(1)
Description
Qty.
1
2.2µF/6.3V, X5R
0.1µF/6.3V, X7R
VJ0402Y104KXQCW1BC
C1608X5R0J225K
1
2.2µF/6.3V, X5R
1
C1608X5R0J225K
TDK(1)
2.2µF/6.3V, X5R
1
CRCW06031002FKEYE3
CRCW06031002FKEYE3
CRCW08050000FKEYE3
Vishay Dale(2)
Vishay Dale(2)
Vishay Dale(2)
Sumida(3)
10k, 0603, 1/16W, 1%
10k, 0603, 1/16W, 1%
0, 0805, 1/8W, 1%
2.2µH, 1.1A (Isat)
1
1
1
CDRH2D11/HPNP-2R2NC
1
U1
MIC2225-XYMT
Micrel, Inc.(4)
2Mhz PWM Synchronous Buck Regulator
with 300mA LDO
1
Notes:
1. TDK: www.tdk.com
2. Vishay: www.vishay.com
3. Sumida: www.sumida.com
4. Micrel, Inc.: www.micrel.com
M9999-022008-D
February 2008
14
Micrel, Inc.
MIC2225
Package Information
10-Pin Thin MLF® (MT)
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its
use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product
can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant
into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A
Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully
indemnify Micrel for any damages resulting from such use or sale.
© 2007 Micrel, Incorporated.
M9999-022008-D
February 2008
15
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