ST1S50 Datasheet, PDF (1/29 Pages) STMicroelectronics – Solid state disk drive, Blu-ray, DVD

ST1S50
4 A monolithic synchronous step-down switching converter with
high efficiency at light load
Datasheet - production data
VFDFPN10
Applications
 Point of load for: STB, TVs, gateway
 Solid state disk drive, Blu-ray, DVD
 P/ASIC/DSP/FPGA core and I/O supplies
Features
 4 A output current
 4.0 V to 18 V input voltage
 Output voltage adjustable from 0.8 V to 0.88 x
V_IN
 500 kHz switching frequency
 High efficiency at light load
 Programmable soft-start and enable
 Integrated 95 m and 69 m power MOSFETs
 All ceramic capacitor
 Power Good
 Cycle-by-cycle current limiting
 Short-circuit protection
 VFDFPN10 3 x 3 x 1 mm - 10 L
Description
The ST1S50 device is a 500 kHz fixed frequency
PWM synchronous step-down regulator. The
ST1S50 operates from 4.0 V to 18 V input, while it
regulates an output voltage as low as 0.8 V and
up to 0.88 x V_IN.
The ST1S50 device integrates a 95 m high-side
switch and a 69 m synchronous rectifier
allowing very high efficiency with very low output
voltages.
The peak current mode control with a special
PFM mode enables high efficiency at a light load.
The ST1S50 device is available in a VFDFPN10
3 x 3 x 1 mm - 10 leads package.
Figure 1. Application circuit
R3
VIN
Cinsw
Cina
Css
Cbst
PG
VINSW
BST
SW
VINA
EN_SS ST1S50
COMP
Rc
GNDP
FB
GNDA
L
R1
R2
VOUT
Cout
Cc
March 2015
This is information on a product in full production.
DocID025723 Rev 4
1/29
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