ST1S10 Datasheet, PDF (1/26 Pages) STMicroelectronics – 3 A, 900 kHz, monolithic synchronous step-down regulator

ST1S10
3 A, 900 kHz, monolithic synchronous
step-down regulator
Features
■ Step-down current mode PWM regulator
■ Output voltage adjustable from 0.8 V
■ Input voltage from 2.5 V up to 18 V
■ 2% DC output voltage tolerance
■ Synchronous rectification
■ Inhibit function
■ Synchronizable switching frequency from 400
kHz up to 1.2 MHz
■ Internal soft start
■ Dynamic short circuit protection
■ Typical efficiency: 90%
■ 3 A output current capability
■ Stand-by supply current: max 6 µA over
temperature range
■ Operative junction temp: from -25°C to 125°C
Applications
■ Consumer
– STB, DVD, DVD recorders, TV, VCR, car
audio, LCD monitors
■ Networking
– XDSL, modems, DC-DC modules
■ Computer
– Optical storage, HD drivers, printers,
audio/graphic cards
■ Industrial and security
– Battery chargers, DC-DC converters, PLD,
PLA, FPGA, LED drivers
DFN8 (4x4mm)
PowerSO-8
Description
The ST1S10 is a high efficiency step-down PWM
current mode switching regulator capable of
providing up to 3 A of output current. The device
operates with an input supply range from 2.5 V to
18 V and provides an adjustable output voltage
from 0.8 V (V_FB) to 0.85*V_{IN_SW} [V_OUT =
V_FB*(1+R1/R2)]. It operates either at a 900 kHz
fixed frequency or can be synchronized to an
external clock (from 400 kHz to 1.2 MHz). The
high switching frequency allows the use of tiny
SMD external components, while the integrated
synchronous rectifier eliminates the need for a
Schottky diode. The ST1S10 provides excellent
transient response, and is fully protected against
thermal overheating, switching over-current and
output short circuit.
The ST1S10 is the ideal choice for point-of-load
regulators or LDO pre-regulation.
Table 1. Device summary
Part number
ST1S10
DFN8 (4x4 mm)
ST1S10PUR
Package
PowerSO-8
ST1S10PHR
October 2007
Rev. 3
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