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PDF AP3435 Data sheet ( Hoja de datos )
| Número de pieza | AP3435 | |
| Descripción | Synchronous Step Down DC-DC Converter | |
| Fabricantes | BCD Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AP3435 (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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Preliminary Datasheet
1.0MHz, 3.5A, Synchronous Step Down DC-DC Converter AP3435
General Description
The AP3435 is a high efficiency step-down DC-DC
voltage converter. The chip operation is optimized
by peak-current mode architecture with built-in
synchronous power MOS switchers. The oscillator
and timing capacitors are all built-in providing an
internal switching frequency of 1MHz that allows
the use of small surface mount inductors and
capacitors for portable product implementations.
Integrated Soft Start (SS), Under Voltage Lock Out
(UVLO), Thermal Shutdown Detection (TSD) and
Short Circuit Protection are designed to provide
reliable product applications.
The device is available in adjustable output voltage
versions ranging from 0.8V to 0.9×VIN
(2.7V≤VIN≤5.5V), and is able to deliver up to 3.5A.
The AP3435 is available in PSOP-8 package.
Features
• High Efficiency Buck Power Converter
• Output Current: 3.5A
• Low RDS(ON) Internal Switches:100mΩ (VIN=5V)
• Adjustable Output Voltage from 0.8V to 0.9×VIN
• Wide Operating Voltage Range: 2.7V to 5.5V
• Built-in Power Switches for Synchronous
Rectification with High Efficiency
• Feedback Voltage: 800mV
• 1.0MHz Constant Frequency Operation
• Thermal Shutdown Protection
• Low Drop-out Operation at 100% Duty Cycle
• No Schottky Diode Required
• Input Over Voltage Protection
Applications
• LCD TV
• Set Top Box
• Post DC-DC Voltage Regulation
• PDA and Notebook Computer
Dec. 2012 Rev. 1. 0
PSOP-8
Figure 1. Package Type of AP3435
BCD Semiconductor Manufacturing Limited
1
1 page  
Preliminary Datasheet
1.0MHz, 3.5A, Synchronous Step Down DC-DC Converter AP3435
Electrical Characteristics
VIN=VCC=VEN=5V, VOUT=1.2V, VFB=0.8V, L=2.2μH, CIN=10μF, COUT=22μF, TA=25°C, unless otherwise
specified.
Parameter
Input
Range
Voltage
Shutdown Current
Active Current
Regulated Feedback
Voltage
Regulated Output
Voltage Accuracy
Peak Inductor
Current
Oscillator
Frequency
PMOSFET RON
NMOSFET RON
EN High-level Input
Voltage
EN Low-level Input
Voltage
EN Input Current
Soft Start Time
Maximum Duty
Cycle
Under Voltage Lock
Out Threshold
Thermal Shutdown
Input Over Voltage
Protection (IOVP)
Symbol
VIN
IOFF
ION
VFB
ΔVOUT/VOUT
IPK
fOSC
RON(P)
RON(N)
VEN_H
VEN_L
IEN
tSS
DMAX
VUVLO
TSD
VIOVP
Conditions
VEN=0
VFB=0.95V
For Adjustable Output Voltage
VIN=2.7V to 5.5V,
IOUT=0 to 3.5A
VIN=2.7V to 5.5V
VIN=5V
VIN=5V
Rising
Falling
Hysteresis
Hysteresis=30°C
Rising
Hysteresis
Min Typ Max Unit
2.7 5.5 V
1
310
μA
μA
0.784 0.8 0.816 V
-3 3 %
4.5 A
1.0
100
100
1.5
MHz
mΩ
mΩ
V
0.4
1
400
V
μA
μs
100 %
2.4
2.3
0.1
150
5.8 5.9 6.0
0.3 0.4 0.5
V
°C
V
V
Dec. 2012 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
5
5 Page 
Preliminary Datasheet
1.0MHz, 3.5A, Synchronous Step Down DC-DC Converter AP3435
Typical Performance Characteristics (Continued)
VIN
1V/div
IOUT
500mA/div
VOUT
1V/div
VIN
1V/div
IOUT
500mA/div
VOUT
1V/div
Time 100μs/div
Figure 24. OVP Function (VIN=5V to 6V)
Time 100μs/div
Figure 25. Leave OVP Function (VIN=6V to 5V)
Dec. 2012 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet AP3435.PDF ] | |
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