FAN2002MPX [ONSEMI]
高能效步降 DC-DC 转换器;
| 型号： | FAN2002MPX |
| 厂家： | 
ONSEMI |
| 描述： | 高能效步降 DC-DC 转换器 开关 转换器 |
| 文件： | 总11页 (文件大小：439K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DATA SHEET
www.onsemi.com
High-Efficiency Step-Down
DC-DC Converter
1 A
WDFN6
CASE 511CP
FAN2001/FAN2002
Description
MARKING DIAGRAM
Designed for use in battery−powered applications, the FAN2001/
FAN2002 is a high−efficiency, low−noise synchronous PWM current
mode and Pulse Skip (Power Save) mode dc−dc converter. It can
provide up to 1 A of output current over a wide input range from 2.5 V
to 5.5 V. The output voltage can be externally adjusted over a wide
range of 0.8 V to 5.5 V by means of an external voltage divider.
At moderate and light loads, pulse skipping modulation is used.
Dynamic voltage positioning is applied, and the output voltage is
shifted 0.8% above nominal value for increased headroom during load
transients. At higher loads the system automatically switches over to
current mode PWM control, operating at 1.3 MHz. A current mode
control loop with fast transient response ensures excellent line and
load regulation. To achieve high efficiency and ensure long battery
life, the quiescent current is reduced to 25 mA in Power Save mode,
and the supply current drops below 1 mA in shut−down mode. The
FAN2001/FAN2002 is available in a 3x3 mm 6−lead MLP package.
$Y&Z&2&K
200x
C
$Y
&Z
&2
&K
= onsemi Logo
= Assembly Plant Code
= 2−Digit Data Code
= Lot Run Traceability Code
200xC = Specific Device Code
x = 1 or 2
ORDERING INFORMATION
†
Device
Package
Shipping
FAN2001MPX
WDFN6
(Pb−Free,
Halide Free)
3000 /
Tape & Reel
Features
FAN2002MPX
• 96% Efficiency, Synchronous Operation
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
• Adjustable Output Voltage Options from 0.8 V to V
IN
• 2.5 V to 5.5 V Input Voltage Range
• Up to 1 A Output Current
• Fixed Frequency 1.3 MHz PWM Operation
• High Efficiency Power Save Mode
• 100% Duty Cycle Low Dropout Operation
• Soft Start
• Output Over−Voltage Protection
• Dynamic Output Voltage Positioning
• 25 mA Quiescent Current
• Thermal Shutdown and Short Circuit Protection
• Pb−Free and Halide Free
Applications
• Pocket PCs, PDAs
• Cell Phones
• Battery−Powered Portable Devices
• Digital Cameras
• Hard Disk Drives
• Set−Top−Boxes
• Point−of−Load Power
• Notebook Computers
• Communications Equipment
© Semiconductor Components Industries, LLC, 2005
1
Publication Order Number:
November, 2021 − Rev. 2
FAN2002/D
FAN2001/FAN2002
TYPICAL APPLICATION
3.3 mH
SW
V
FB
PGND
SW
IN
V
EN
OUT
1
2
3
1
2
3
6
5
4
6
5
4
1.2 V (1 A)
R2
10 kW
C
IN
V
PGND
EN
P1
(AGND)
P1
(AGND)
R1
5kW
IN
C
NC
FB
OUT
2 x 10 mF
R1
5 kW
10 mF
L1
PV
V
IN
OUT
1.2 V (1 A)
3.3 mH
10 mF
10 kW
R2
2 x 10 mF
FAN2002
FAN2001
Figure 1. Typical Application
PIN ASSIGNMENT AND DESCRIPTION
V
SW
NC
FB
FB
PGND
SW
EN
1
2
3
1
2
3
6
5
4
6
IN
P1
(AGND)
P1
(AGND)
5
4
PGND
EN
V
IN
PV
IN
FAN2002
FAN2001
Figure 2. Pin Assignment (Top View)
PIN DESCRIPTION
Pin No.
FAN2001
P1
Pin Name
Description
AGND
Analog Ground. P1 must be soldered to the PCB ground.
1
2
V
Supply Voltage Input.
IN
PGND
Power Ground. This pin is connected to the internal MOSFET switches. This pin must be
externally connected to AGND.
3
EN
Enable Input. Logic high enables the chip and logic low disables the chip, reducing the supply
current to less than 1 mA. Do not float this pin.
4
5
FB
NC
SW
Feedback Input. Adjustable voltage option, connect this pin to the resistor divider.
No Connection Pin.
6
FAN2002
P1
Switching Node. This pin is connected to the internal MOSFET switches.
AGND
FB
Analog Ground. P1 must be soldered to the PCB ground.
1
2
Feedback Input. Adjustable voltage option, connect this pin to the resistor divider.
PGND
Power Ground. This pin is connected to the internal MOSFET switches. This pin must be
externally connected to AGND.
3
4
5
6
SW
Switching Node. This pin is connected to the internal MOSFET switches.
Supply Voltage Input. This pin is connected to the internal MOSFET switches.
Supply Voltage Input.
PV
IN
V
IN
EN
Enable Input. Logic high enables the chip and logic low disables the chip, reducing the supply
current to less than 1 mA. Do not float this pin.
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2
FAN2001/FAN2002
ABSOLUTE MAXIMUM RATINGS (Unless otherwise specified, all other voltages are referenced to AGND.)
Parameter
Min
−0.3
−0.3
Max
Unit
V
V
IN
, PV
7
IN
V
IN
Voltage On Any Other Pin
V
Lead Soldering Temperature (10 seconds)
Junction Temperature
260
150
150
8
_C
_C
_C
_C/W
kV
Storage Temperature
−65
Thermal Resistance−Junction to Tab (q ), 3x3 mm 6−lead MLP (Note 1)
JC
Electrostatic Discharge Protection (ESD) Level (Note 2)
HBM
CDM
4
1
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality
should not be assumed, damage may occur and reliability may be affected.
1. Junction to ambient thermal resistance, q , is a strong function of PCB material, board thickness, thickness and number of copper planes,
JA
number of via used, diameter of via used, available copper surface, and attached heat sink characteristics.
2. Using Mil Std. 883E, method 3015.7(Human Body Model) and EIA/JESD22C101−A (Charge Device Model).
RECOMMENDED OPERATING CONDITIONS (Unless otherwise specified, all other voltages are referenced to AGND.)
Parameter
Min
2.5
0.8
Typ
Max
5.5
VIN
1
Unit
V
Supply Voltage Range
Output Voltage Range, Adjustable Version
Output Current
V
A
Inductor (Note 3)
3.3
10
mH
mF
mF
_C
_C
Input Capacitor (Note 3)
Output Capacitor (Note 3)
2 x 10
Operating Ambient Temperature Range
Operating Junction Temperature Range
−40
−40
+85
+125
Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond
the Recommended Operating Ranges limits may affect device reliability.
3. Refer to the Applications section for further details.
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3
FAN2001/FAN2002
ELECTRICAL CHARACTERISTICS
(V = V
+ 0.6 V (min. 2.5 V) to 5.5 V, I
= 350 mA, V
= 1.2 V, EN = V , T = −40_C to +85_C, Unless otherwise noted. Typical
IN
OUT
OUT
OUT
IN
A
values are at T = 25_C.)
A
Symbol
Parameter
Test Conditions
≤ 600 mA
Min
2.5
2.7
Typ
Max
5.5
5.5
35
Unit
V
V
IN
Input Voltage
0 mA ≤ I
0 mA ≤ I
OUT
≤ 1000 mA
V
OUT
I
Q
Quiescent Current
I
= 0 mA, Device is not switching
20
50
mA
mA
mA
mA
V
OUT
I
= 0 mA, Device is
R2 = 10 kW
OUT
switching (Note 4)
R2 = 100 kW
25
Shutdown Supply Current
EN = GND
0.1
2.1
150
1
Undervoltage Lockout Threshold
V
IN
Rising
1.9
1.3
2.3
Hysteresis
mV
V
V
Enable High Input Voltage
Enable Low Input Voltage
EN Input Bias Current
PMOS On Resistance
ENH
V
0.4
0.1
V
ENL
I
EN = V or GND
0.01
250
300
200
250
1500
1300
0.1
mA
mW
EN
IN
R
V
IN
V
IN
V
IN
V
IN
= V = 5.5 V
350
400
300
350
2000
1500
1
DS(on)
GS
= V = 2.5 V
GS
NMOS On Resistance
= V = 5.5 V
mW
GS
= V = 2.5 V
GS
I
P−channel Current Limit
Oscillator Frequency
N−channel Leakage Current
P−channel Leakage Current
Line Regulation
2.5 V < V < 5.5 V
1300
1000
mA
kHz
mA
mA
%/V
%
LIM
IN
I
V
V
I
= 5.5 V
= 5.5 V
≤ 10 mA
lkg_(N)
DS
I
0.1
1
lkg_(P)
DS
0.16
0.15
0.8
OUT
Load Regulation
350 mA ≤ I
≤ 1000 mA
OUT
V
ref
Reference Voltage
V
Output DC Voltage Accuracy
(Note 5)
0 mA ≤ I
≤ 1000 mA
−3
+3
%
OUT
Over−Temperature Protection
PWM Mode Only
350 mA ≤ I ≤ 1000 mA
Rising Temperature
Hysteresis
150
20
_C
_C
ms
OUT
Start−Up Time
I
= 1000 mA, C
= 20 mF
800
OUT
OUT
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product
performance may not be indicated by the Electrical Characteristics if operated under different conditions.
4. Refer to the applications section for further details.
5. For output voltages ≤ 1.2 V a 40 mF output capacitor value is required to achieve a maximum output accuracy of 3% while operating in power
save mode (PFM mode).
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4
FAN2001/FAN2002
TYPICAL PERFORMANCE CHARACTERISTICS
(T = 25°C, C = 10 mF, C
= 20 mF, L = 3.3 mH, R2 = 10 kW, unless otherwise noted.)
A
IN
OUT
100
95
90
85
80
75
100
95
90
85
80
V
= 3.9 V
IN
70
65
60
55
50
45
40
35
V
= 5 V
= 3.3 V
IN
V
= 5.5 V
IN
V
OUT
V
V
= 3.6 V
= 3 V
IN
75
70
65
60
V
= 3.6 V
= 1.2 V
IN
OUT
V
OUT
V
= 3.3 V
OUT
R = 100 kW
2
0.1
1
10
Load Current (mA)
100
1000
1
10
100
1000
1000
5.5
Load Current (mA)
Figure 3. Efficiency vs. Load Current
Figure 4. Efficiency vs. Load Current
1.214
1.212
1.210
1.208
1.206
1.204
1.202
1.200
100
90
V
= 1.2 V
V
= 5 V
OUT
IN
R = 100 kW
2
80
70
V
= 5.5 V
V
= 2.5 V
IN
IN
60
50
40
30
1.198
1.196
1.194
1.192
V
= 3.6 V
IN
0
200
400
600
800
1000
0.1
1
10
Load Current (mA)
100
Load Current (mA)
Figure 5. Efficiency vs. Load Current
Figure 6. Output Voltage vs. Load Current
80
1400
1380
V
= 1.2 V
OUT
70
60
50
40
1360
1340
1320
1300
1280
1260
1240
1220
1200
V
V
= 5.5 V
= 3.6 V
IN
R = 10 kW
2
IN
30
20
10
0
R = 100 kW
2
V
= 2.5 V
40
IN
2.5
3.0
3.5
4.0
4.5
5.0
−40
−20
0
20
60
80
100
Input Voltage (V)
Temperature (5C)
Figure 7. Quiescent Current vs. Input Voltage
Figure 8. Frequency vs. Temperature
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5
FAN2001/FAN2002
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(T = 25°C, C = 10 mF, C
= 20 mF, L = 3.3 mH, R2 = 10 kW, unless otherwise noted.)
A
IN
OUT
Time (1 ms/div)
Time (5 ms/div)
Figure 9. PWM Mode
Figure 10. Power Save Mode
100 mA
100 mA
600 mA
600 mA
V
= 1.2 V
V
OUT
= 1.2 V
OUT
Time (10 ms/div)
Time (10 ms/div)
Figure 11. Load Transient Response
Figure 12. Load Transient Response
V
I
= 1.2 V
= 1000 mA
OUT
V
OUT
= 1.2 V
OUT
I
= 10 mA
OUT
Time (100 ms/div)
Time (200 ms/div)
Figure 13. Start−Up Response
Figure 14. Start−Up Response
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6
FAN2001/FAN2002
BLOCK DIAGRAM
EN
V
IN
DIGITAL
SOFT START
CURRENT
SENSE
IS
UNDER−VOLGATE
LOCKOUT
IS
PFM
COMP
REF
FB
ERROR
AMP
MOSFET
DRIVER
LOGIC
CONTROL
COMP
SW
0.8 V
GND
IS
OVER
VOLTAGE
COMP
OSC
SLOPE COMPENSATION
REF FB
NEG.
LIMIT
SENSE
NEG.
LIMIT
COMP
GND
Figure 15. Block Diagram
DETAILED OPERATION DESCRIPTION
PFM (Power Save) Mode
The FAN2001/FAN2002 is a step−down converter
operating in a current−mode PFM/PWM architecture with a
typical switching frequency of 1.3 MHz. At moderate to
heavy loads, the converter operates in pulse−width−
modulation (PWM) mode. At light loads the converter
enters a power−save mode (PFM pulse skipping) to keep the
efficiency high.
As the load current decreases and the inductor current
reaches negative value, the converter enters
pulse−frequency−modulation (PFM) mode. The transition
point for the PFM mode is given by the equation:
VOUT
1 * ǒ Ǔ
VIN
IOUT + VOUT
(eq. 1)
2 L f
PWM Mode
The typical output current when the device enters PFM
mode is 150 mA for input voltage of 3.6 V and output
voltage of 1.2 V. In minimum. Consequently, the high
efficiency is maintained at light loads. As soon as the output
voltage falls below a threshold, set at 0.8% above the
nominal value, the P−channel transistor is turned on and the
inductor current ramps up. The P−channel switch turns off
and the N−channel turns on as the peak inductor current is
reached (typical 450 mA).
In PWM mode, the device operates at a fixed frequency of
1.3 MHz. At the beginning of each clock cycle, the
P−channel transistor is turned on. The inductor current
ramps up and is monitored via an internal circuit. The
P−channel switch is turned off when the sensed current
causes the PWM comparator to trip when the output voltage
is in regulation or when the inductor current reaches the
current limit (set internally to typically 1500 mA). After
a minimum dead time the N−channel transistor is turned on
and the inductor current ramps down. As the clock cycle is
completed, the N−channel switch is turned off and the next
clock cycle starts.
The N−channel transistor is turned off before the inductor
current becomes negative. At this time the P−channel is
switched on again starting the next pulse. The converter
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7
FAN2001/FAN2002
UVLO and Soft Start
The reference and the circuit remain reset until the V
crosses its UVLO threshold.
continues these pulses until the high threshold (typical 1.6%
above nominal value) is reached. A higher output voltage in
PFM mode gives additional headroom for the voltage drop
during a load transient from light to full load. The voltage
overshoot during this load transient is also minimized due to
active regulation during turn on of the N−channel rectifier
switch. The device stays in sleep mode until the output
voltage falls below the low threshold. The FAN2001/
FAN2002 enters the PWM mode as soon as the output
voltage can no longer be regulated in PFM with constant
peak current.
IN
The FAN2001/FAN2002 has an internal soft−start circuit
that limits the in−rush current during start−up. This prevents
possible voltage drops of the input voltage and eliminates
the output voltage overshoot. The soft−start is implemented
as a digital circuit increasing the switch current in four steps
to the P−channel current limit (1500 mA). Typical start−up
time for a 20 mF output capacitor and a load current of
1000 mA is 800 ms.
Short Circuit Protection
100% Duty Cycle Operation
The switch peak current is limited cycle−by−cycle to
a typical value of 1500 mA. In the event of an output voltage
short circuit, the device operates with a frequency of
400 kHz and minimum duty cycle, therefore the average
input current is typically 200 mA.
As the input voltage approaches the output voltage and the
duty cycle exceeds the typical 95%, the converter turns the
P−channel transistor continuously on. In this mode the
output voltage is equal to the input voltage minus the voltage
drop across the P−channel transistor:
VOUT + VIN * ILOAD (RDS(on) ) RL)
(eq. 2)
Thermal Shutdown
When the die temperature exceeds 150°C, a reset occurs
and will remain in effect until the die cools to 130°C, at that
time the circuit will be allowed to restart.
where:
R
= P−channel Switch ON Resistance
= Output Current
DS(on)
LOAD
I
R
L
= Inductor DC Resistance
APPLICATIONS INFORMATION
Inductor Selection
Setting the Output Voltage
The internal reference is 0.8 V (Typical). The output
voltage is divided by a resistor divider, R1 and R2 to the FB
pin. The output voltage is given by:
The inductor parameters directly related to the device’s
performances are saturation current and dc resistance. The
FAN2001/FAN2002 operates with a typical inductor value
of 3.3 mH. The lower the dc resistance, the higher the
efficiency. For saturation current, the inductor should be
rated higher than the maximum load current plus half of the
inductor ripple current.
R1
R2
ǒ1 ) Ǔ
(eq. 3)
VOUT + VREF
where:
R + R < 800 kW
This is calculated as follows:
1
2
VOUT
1 * ǒ Ǔ
VIN
According to this equation, and assuming desired output
voltage of 1.5096 V, and given R2 = 10 kW, the calculated
value of R1 is 8.87 kW. If quiescent current is a key design
parameter a higher value feedback resistor can be used (e.g.
R2 = 100 kW) and a small bypass capacitor of 10 pF is
required in parallel with the upper resistor as shown in
Figure 16.
DIL + VOUT
(eq. 4)
L f
where:
DI
f
L
= Inductor Ripple Current
= Switching Frequency
= Inductor Value
L
Some recommended inductors are suggested in the table
below:
3.3 mH
V
IN
V
OUT
1
2
3
6
5
4
1.2 V (1 A)
SW
NC
FB
C
IN
PGND
EN
P1
(AGND)
R1
5 kW
C
OUT
2 x 10 mF
Table 1. RECOMMENDED INDUCTORS
10 mF
Inductor Value
3.3 mH
Vendor
Panasonic
Murata
Part Number
ELL6PM3R3N
LQS66C3R3M04
R2
10 kW
3.3 mH
Figure 16. Setting the Output Voltage
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8
FAN2001/FAN2002
Capacitors Selection
For best performances, a low ESR input capacitor is
required. A ceramic capacitor of at least 10 mF, placed as
close to the V and AGND pins of the device is
IN
recommended. The output capacitor determines the output
ripple and the transient response.
Table 2. RECOMMENDED CAPACITORS
Capacitor Value
Vendor
Part Number
10 mF
Taiyo Yuden
JMK212BJ106MG
JMK316BJ106KL
C2012X5ROJ106K
C3216X5ROJ106M
GRM32ER61C106K
TDK
Figure 18. Recommended PCB Layout (FAN2002)
Murata
Therefore, use wide traces for high current paths and place
the input capacitor, the inductor, and the output capacitor as
close as possible to the integrated circuit terminals. In order
to minimize voltage stress to the device resulting from ever
present switching spikes, use an input bypass capacitor with
low ESR. Note that the peak amplitude of the switching
spikes depends upon the load current; the higher the load
current, the higher the switching spikes. The resistor divider
that sets the output voltage should be routed away from the
inductor to avoid RF coupling. The ground plane at the
bottom side of the PCB acts as an electromagnetic shield to
reduce EMI.
PCB Layout Recommendations
The recommended PCB layout is shown in Figures 17 and
18. The inherently high peak currents and switching
frequency of power supplies require a careful PCB layout
design.
For more board layout recommendations download the
application note “PCB Grounding System and
FAN2001/FAN2011
High
Performance
DC−DC
Converters” (AN−42036/D).
Figure 17. Recommended PCB Layout (FAN2001)
FAIRCHILD SEMICONDUCTOR is a registered trademark of Semiconductor Components Industries, LLC dba “onsemi” or its affiliates and/or subsidiaries
in the United States and/or other countries.
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9
MECHANICAL CASE OUTLINE
PACKAGE DIMENSIONS
WDFN6 3x3, 0.95P
CASE 511CP
ISSUE O
DATE 31 JUL 2016
Electronic versions are uncontrolled except when accessed directly from the Document Repository.
Printed versions are uncontrolled except when stamped “CONTROLLED COPY” in red.
DOCUMENT NUMBER:
DESCRIPTION:
98AON13603G
WDFN6 3X3, 0.95P
PAGE 1 OF 1
ON Semiconductor and
are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries.
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the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability arising out of the application or use of any product or circuit, and specifically
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FAN2012EMPX
Switching Regulator, Current-mode, 1.5A, 1600kHz Switching Freq-Max, 3 X 3 MM, MO-229-WEEA, MLP-6
ROCHESTER
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