BCD AP3422 Dual 1.1mhz, 800ma synchronous dc-dc buck converter Datasheet

Preliminary Datasheet
Dual 1.1MHz, 800mA Synchronous DC-DC Buck Converter
General Description
Features
The AP3422 contains two independent 1.1MHz fixed
frequency, current mode, PWM synchronous buck
(step-down) DC-DC converters, each of them is
capable of driving a 800mA load with high efficiency,
excellent line and load regulation. Each converter
integrates a main switch and a synchronous switch
without an external Schottky diode. It is ideal for
powering portable equipment that runs from a single
Li-ion battery.
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•
•
•
•
•
•
•
•
A standard series of inductors are available from
several different manufacturers optimized for use
with the AP3422. This feature greatly simplifies the
design of switch-mode power supplies.
AP3422
High Efficiency: up to 95%
Output Current on Each Channel: 800mA
Input Voltage Range: 2.5V to 5.5V
Fixed 1.1MHz Frequency
100% Duty Cycle in Dropout
Built-in Short Circuit Protection
Built-in Thermal Shutdown Function
Built-in Current Limit Function
Shutdown Current: <1μA
Applications
•
•
•
•
This IC is available in DFN-3×3-10 package.
GPS
WiFi Card
Portable Media Player
Digital Still and Video Cameras
DFN-3×3-10
Figure 1. Package Type of AP3422
Sep. 2011
Rev. 1. 1
BCD Semiconductor Manufacturing Limited
1
Preliminary Datasheet
Dual 1.1MHz, 800mA Synchronous DC-DC Buck Converter
AP3422
Pin Configuration
DN Package
(DFN-3×3-10)
Pin 1 Mark
EN1
1
10
SW1
9
GND1
8
VIN1
FB1
2
VIN2
3
GND2
4
7
FB2
SW2
5
6
EN2
Exposed
Pad
Figure 2. Pin Configuration of AP3422 (Top View)
Pin Description
Pin Number
Pin Name
1
EN1
2
FB1
3
VIN2
4
GND2
5
SW2
6
EN2
7
FB2
8
VIN1
9
GND1
10
SW1
Sep. 2011
Function
Channel 1 enable control input. Drive EN1 above 1.5V to turn on the
Channel 1. Drive EN1 below 0.6V to turn it off (shutdown current <
0.1µA)
Channel 1 feedback input. Connect FB1 to the center point of the external
resistor divider. The feedback voltage is 0.6V
Channel 2 supply input. Bypass to GND with a 10µF or greater ceramic
capacitor
Ground 2
Channel 2 power switch output. Inductor connection to drains of the
internal PFET and NFET switches
Channel 2 Enable Control Input. Drive EN2 above 1.5V to turn on the
Channel 2. Drive EN2 below 0.6V to turn it off (shutdown current <
0.1µA)
Channel 2 feedback input. Connect FB2 to the center point of the external
resistor divider. The feedback voltage is 0.6V
Channel 1 supply input. Bypass to GND with a 10µF or greater ceramic
capacitor
Ground 1
Channel 1 power switch output. Inductor connection to drains of the
internal PFET and NFET switches
Rev. 1. 1
BCD Semiconductor Manufacturing Limited
2
Preliminary Datasheet
Dual 1.1MHz, 800mA Synchronous DC-DC Buck Converter
AP3422
Functional Block Diagram
EN1, EN2
VIN1, VIN2
1, 6
8, 3
Shutdown
Control
Slope
Compensation
Oscillator
VREF with
Soft-start
FB1,
FB2
Current
Sense
Current Limit
Detector
PWM
Comparator
10,5
Control
Logic
Driver
SW1,
SW2
0.6V
Error
Amplifier
Over
Temperature
Detector
2, 7
9, 4
GND1, GND2
Figure 3. Functional Block Diagram of AP3422 (Diagram represents ½ of the AP3422)
Ordering Information
AP3422
G1: Green
Circuit Type
TR: Tape & Reel
Package
DN: DFN-3×3-10
Package
Temperature
Range
DFN-3×3-10
-40 to 85 ºC
Part Number
AP3422DNTR-G1
Marking ID
BDC
Packing Type
Tape & Reel
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS
compliant and green.
Sep. 2011
Rev. 1. 1
BCD Semiconductor Manufacturing Limited
3
Preliminary Datasheet
Dual 1.1MHz, 800mA Synchronous DC-DC Buck Converter
AP3422
Absolute Maximum Ratings (Note 1)
Parameter
Symbol
Value
Unit
Input Voltage
VIN1, VIN2
-0.3 to 6
V
Feedback Voltage
VFB1, VFB2
-0.3 to VIN +0.3
V
EN1, EN2 Pin Voltage
VEN1, VIN2
-0.3 to VIN+0.3
V
SW1, SW2 Pin Voltage
VSW1, VSW2
-0.3 to VIN+0.3
V
Thermal Resistance
θJA
50
ºC/W
Operating Junction Temperature
TJ
150
ºC
Storage Temperature
TSTG
-65 to 150
ºC
Lead Temperature (Soldering, 10sec)
TLEAD
260
ºC
Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to
the device. These are stress ratings only, and functional operation of the device at these or any other conditions
beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute
Maximum Ratings” for extended periods may affect device reliability.
Recommended Operating Conditions
Parameter
Symbol
Min
Max
Unit
Input Voltage
VIN1, VIN2
2.5
5.5
V
Maximum Output Current
IOUT1 (MAX),
IOUT2 (MAX)
800
TA
-40
Operating Ambient Temperature
Sep. 2011
Rev. 1. 1
mA
85
ºC
BCD Semiconductor Manufacturing Limited
4
Preliminary Datasheet
Dual 1.1MHz, 800mA Synchronous DC-DC Buck Converter
AP3422
Electrical Characteristics
VIN1=VIN2=VEN1=VEN2=3.6V, TA=25℃, unless otherwise specified. Specifications with boldface type apply over
full operating temperature range from -40 to 85ºC.
Parameters
Symbol
Supply Current on Each
Converter
Shutdown Supply Current
on Each Converter
Under Voltage Lockout
Threshold
Under Voltage Lockout
Hysteresis
Typ
Max
Unit
VFB=0.55V
400
600
μA
ISHDN
VEN=0V, VIN=5.5V
0.01
1
μA
VUVLO
Rising Edge
2.27
V
200
mV
ICC
Conditions
VHUVLO
Feedback Bias Current
IFB
VFB=0.65V
Feedback Voltage
VFB
IOUT=100mA
Maximum Output Current
IOUT (MAX)
Switch Current Limit
ILIM
Oscillator Frequency
fOSC
Soft-start Time
VFB=0.55V
0.5
50
nA
0.588/
0.582
0.600
0.612/
0.618
V
800
mA
800
800
0.95
1.25
0.8
1.1
On
On
A
1.4
0.6
1.5
VENH
EN Pin Input Leakage
Current
Maximum Duty Cycle
VIN=2.5V,
VOUT=0.9V
VIN=3.6V,
VOUT=1.2V
VIN=4.6V,
VOUT=3.3V
-50
VENL
EN Pin Threshold
Internal
PFET
Resistance
Internal
NFET
Resistance
Min
MHz
V
IH
VEN=3.6V
-0.1
0.1
μA
IL
VEN=0V
-0.1
0.1
μA
RDSONP
ISW=100mA
0.44
Ω
RDSONN
ISW=-100mA
0.29
Ω
VFB=0.55V
100
%
VEN=0V to VIN
IOUT=50mA
220
μs
DMAX
TSS
Thermal Shutdown
Threshold
TOTSD
160
ºC
Thermal Shutdown
Hysteresis
THYS
30
ºC
Sep. 2011
Rev. 1. 1
BCD Semiconductor Manufacturing Limited
5
Preliminary Datasheet
Dual 1.1MHz, 800mA Synchronous DC-DC Buck Converter
AP3422
Typical Performance Characteristics
L1=L2=10μH, CIN1=CIN2=COUT1=COUT2=10μF, TA=25 ºC, unless otherwise noted.
0.7
1.4
0.6
Supply Current (mA)
Frequency (MHz)
1.3
1.2
1.1
1.0
0.5
0.4
VIN=3.6V
0.3
VOUT1=1.8V
0.9
VIN=3.6V
IOUT=0A
0.8
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
VFB=0.55V
0.2
-60
6.0
-40
-20
0
20
Input Voltage (V)
60
80
100
120
140
160
o
Figure 4. Frequency vs. Input Voltage
Figure 5. Supply Current vs. Temperature
2.0
2.0
1.8
1.8
1.6
1.6
1.4
Output Voltage (V)
Current Limit (A)
40
Temperature ( C)
1.2
1.0
0.8
0.6
1.4
1.2
1.0
0.8
0.6
0.4
VIN=3.6V
0.2
VFB=0.55V
0.0
-60
-40
-20
0
20
40
60
80
VOUT1=1.8V
0.2
0.0
0.0
100
O
0.2
0.4
0.6
0.8
1.0
1.2
1.4
Output Current (A)
Temperature ( C)
Figure 6. Current Limit vs. Temperature
Sep. 2011
VIN=3.6V
0.4
Figure 7. Output Voltage vs. Output Current
Rev. 1. 1
BCD Semiconductor Manufacturing Limited
6
Preliminary Datasheet
Dual 1.1MHz, 800mA Synchronous DC-DC Buck Converter
AP3422
Typical Performance Characteristics (Continued)
L1=L2=10μH, CIN1=CIN2=COUT1=COUT2=10μF, TA=25 ºC, unless otherwise noted.
100
1.5
90
1.0
0.5
Efficiency (%)
Normalized Feedback Voltage (%)
2.0
0.0
-0.5
-1.0
-2.0
-60
-20
0
20
40
60
80
VOUT2=1.2V
50
100
0
200
400
600
800
Output Current (mA)
o
Temperature ( C)
Figure 8. Normalized Feedback Voltage vs. Temperature
IOUT1
500mA
VOUT1
200mV
Figure 9. Efficiency vs. Output Current
VSW1
5V
VOUT1
20mV
IOUT2
500mA
VOUT2
200mV
VSW2
5V
VOUT2
20mV
Time 200μs/div
Time
Figure 10. Load Transient (VIN=4.2V, VOUT1=1.8V, VOUT2=1.2V,
IOUT1=400mA to 800mA, IOUT2=400 to 800mA)
Sep. 2011
VOUT1=1.8V
60
VOUT1=1.8V
-40
70
VIN=4.2V
VIN=3.6V
-1.5
80
Rev. 1. 1
1μs/div
Figure 11. Heavy Load Operation (VIN=4.2V,
VOUT1=1.8V, VOUT2=1.2V, IOUT1=IOUT2=800mA)
BCD Semiconductor Manufacturing Limited
7
Preliminary Datasheet
Dual 1.1MHz, 800mA Synchronous DC-DC Buck Converter
AP3422
Typical Performance Characteristics (Continued)
L1=L2=10μH, CIN1=CIN2=COUT1=COUT2=10μF, TA=25 ºC, unless otherwise noted.
VEN
2V
VOUT1
1V
VOUT2
1V
Time 400μs/div
Figure 12. Start-up from Shutdown (VIN=4.2V,
VOUT1=1.8V, VOUT2=1.2V, VEN=0 to 3.6V, IOUT1=IOUT2=400mA)
Sep. 2011
Rev. 1. 1
BCD Semiconductor Manufacturing Limited
8
Preliminary Datasheet
Dual 1.1MHz, 800mA Synchronous DC-DC Buck Converter
AP3422
Typical Application
Figure 13. Typical Application of AP3422
Sep. 2011
Rev. 1. 1
BCD Semiconductor Manufacturing Limited
9
Preliminary Datasheet
Dual 1.1MHz, 800mA Synchronous DC-DC Buck Converter
AP3422
Mechanical Dimensions
DFN-3×3-10
Sep. 2011
Rev. 1. 1
Unit:mm(inch)
BCD Semiconductor Manufacturing Limited
10
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