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SD46520 Datasheet Preview

SD46520 Datasheet

400KHZ 2A STEP-DOWN DC-DC CONVERTER

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SD46520
400KHZ 2A STEP-DOWN DC-DC CONVERTER
DESCRIPTION
The SD46520 is a step-down PWM control converter with a built-in
internal power MOSFET. It achieves 2A continuous output current
over a wide input supply range with excellent load and line
regulation.
Current mode operation provides fast transient response and eases
loop stabilization.
It provides cycle-by-cycle current limiting and thermal shutdown. In
shutdown mode, the current is only 23μA.
SOP-8-225-1.27
FEATURES
* 2A output current
* 0.2internal power MOSFET
* Stable with low ESR output ceramic capacitor
* Up to 95% conversion efficiency
* shutdown mode
* 400kHz fixed frequency
* Thermal shutdown
* Cycle-by-cycle over current protection
* 4.7518V input voltage range
* 1.2216V output voltage range
* Programmable under voltage control
ORDERING INFORMATION
Device
Package
Seal
SD46520 SOP-8-225-1.27 SD46520
APPLICATIONS
* Distributed power system
* Battery charger
* TFT LCD Monitors
* Portable DVD
* Set-Top Box
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.0 2009.04.07
Page 1 of 8




Silan

SD46520 Datasheet Preview

SD46520 Datasheet

400KHZ 2A STEP-DOWN DC-DC CONVERTER

No Preview Available !

BLOCK DIAGRAM
IN
2
Internal 3.3V
Regulators
Current Sense
+ + Amplifier
EN
7
CLK
Oscillator
50/400kHz
Shutdown 1.8V
comparator
1uA
5V
SQ
R
Current
Comparator
Q
2.30/2.53V UVLO
Zero
current
control
Frequency
Foldback
Comparator
0.7V
1.22V
FB
5
Error
Amplifier
COMP
6
ABSOLUTE MAXIMUM RATINGS
Characteristics
Input Voltage
Switch Voltage
Boost Voltage
Feedback Voltage
Enable Voltage
Comp Voltage
Junction Temperature
Lead Temperature
Storage Temperature
Symbol
VIN
VSW
VBS
VFB
VEN
VCOMP
Tj
TL
Tstg
Ratings
20
-1~VIN+1
VSW+6
-0.3~6
-0.3~6
-0.3~6
150
260
-65~150
SD46520
BS 1
SW 3
GND 4
Unit
V
V
V
V
V
V
°C
°C
°C
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.0 2009.04.07
Page 2 of 8


Part Number SD46520
Description 400KHZ 2A STEP-DOWN DC-DC CONVERTER
Maker Silan
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