ST1S41 Datasheet, PDF (1/27 Pages) STMicroelectronics – 850 kHz switching frequency

ST1S41
4 A step-down switching regulator
Datasheet - production data
VFQFPN8 4x4
HSOP8
Features
• 4 A output current
• 4.0 V to 18 V input voltage
• Output voltage adjustable from 0.8 V
• 850 kHz switching frequency
• Internal soft-start
• Integrated 95 mΩ and 69 mΩ power
MOSFETs
• All ceramic capacitor
• Enable
• Cycle-by-cycle current limiting
• Current foldback short-circuit protection
• VFQFPN 4x4-8L and HSOP-8 packages
Applications
• μP/ASIC/DSP/FPGA core and I/O supplies
• Point of load for: STB, TVs, DVD
• Optical storage, hard disk drive, printers,
audio/graphic cards
Description
The ST1S41 is an internally compensated 850
kHz fixed-frequency PWM synchronous step-
down regulator. The ST1S41 operates from 4.0 V
to 18 V input, while it regulates an output voltage
as low as 0.8 V and up to V_IN.
The ST1S41 integrates 95 mΩ high-side switch
and 69 mΩ synchronous rectifier allowing very
high efficiency with very low output voltages.
The peak current mode control with internal
compensation delivers a very compact solution
with a minimum component count.
The ST1S41 is available in VFQFPN 4 mm x 4
mm 8-lead package and HSOP-8.
VIN
Cin_a
Cin_sw
Figure 1. Application circuit
6 _VINSW
1 _VINA
L
7
SW
2 _EN
ST1S41
R1
3
FB
PGND ePAD/GND
R2
8
94
VOUT
Cout
April 2013
This is information on a product in full production.
DocID023654 Rev 2
AM15058v1
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www.st.com
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