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PDF AP3422 Data sheet ( Hoja de datos )
| Número de pieza | AP3422 | |
| Descripción | 800mA Synchronous DC-DC Buck Converter | |
| Fabricantes | BCD Semiconductor | |
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Preliminary Datasheet
Dual 1.1MHz, 800mA Synchronous DC-DC Buck Converter
AP3422
General Description
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.
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.
This IC is available in DFN-3×3-10 package.
Features
• 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
• GPS
• WiFi Card
• Portable Media Player
• Digital Still and Video Cameras
Feb. 2013 Rev. 1. 2
DFN-3×3-10
Figure 1. Package Type of AP3422
BCD Semiconductor Manufacturing Limited
1
1 page  
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
Supply Current on Each
Converter
Shutdown Supply Current
on Each Converter
Under Voltage Lockout
Threshold
Under Voltage Lockout
Hysteresis
Feedback Bias Current
Feedback Voltage
Maximum Output Current
Switch Current Limit
Oscillator Frequency
EN Pin Threshold
EN Pin Input Leakage
Current
Internal PFET
Resistance
On
Internal NFET
Resistance
On
Maximum Duty Cycle
Soft-start Time
Thermal Shutdown
Threshold
Thermal Shutdown
Hysteresis
Symbol
ICC
ISHDN
VUVLO
VHUVLO
IFB
VFB
IOUT (MAX)
ILIM
fOSC
VENL
VENH
IH
IL
RDSONP
RDSONN
DMAX
TSS
TOTSD
THYS
Conditions
VFB=0.55V
VEN=0V, VIN=5.5V
Rising Edge
VFB=0.65V
IOUT=100mA
VIN=2.5V,
VOUT=0.9V
VIN=3.6V,
VOUT=1.2V
VIN=4.6V,
VOUT=3.3V
VFB=0.55V
VEN=3.6V
VEN=0V
ISW=100mA
ISW=-100mA
VFB=0.55V
VEN=0V to VIN
IOUT＝50mA
Min
-50
0.588/
0.582
800
800
800
0.95
0.8
1.5
-0.1
-0.1
Typ
400
0.01
2.27
200
0.5
0.600
1.25
1.1
0.44
0.29
100
220
160
30
Max
600
1
50
0.612/
0.618
1.4
0.6
0.1
0.1
Unit
µA
µA
V
mV
nA
V
mA
A
MHz
V
µA
µA
Ω
Ω
%
µs
ºC
ºC
Feb. 2013 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
5
5 Page 
BCD Semiconductor Manufacturing Limited
http://www.bcdsemi.com
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11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet AP3422.PDF ] | |
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