Datasheet
V
OUT
= 2.5V/2A
C
IN
C
OUT
R
FB1
R
FB2
L1
D1
Q1
10 PF
100 PF
10 PH
1k
2.15k
Si2343
LM3475
V
IN
EN
GND
PGATE
FB
1
2
3
4
5
C
FF
1 nF
V
IN
= 5V
LM3475
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SNVS239B –OCTOBER 2004–REVISED MARCH 2013
LM3475 Hysteretic PFET Buck Controller
Check for Samples: LM3475
1
FEATURES
DESCRIPTION
2
• Easy to Use Control Methodology
The LM3475 is a hysteretic P-FET buck controller
• 0.8V to V
IN
Adjustable Output Range
designed to support a wide range of high efficiency
• High Efficiency (90% Typical)
applications in a very small SOT-23-5 package. The
hysteretic control scheme has several advantages,
• ±0.9% (±1.5% Over Temp) Feedback Voltage
including simple system design with no external
• 100% Duty Cycle Capable
compensation, stable operation with a wide range of
• Maximum Operating Frequency up to 2MHz
components, and extremely fast transient response.
Hysteretic control also provides high efficiency
• Internal Soft-Start
operation, even at light loads. The PFET architecture
• Enable Pin
allows for low component count as well as 100% duty
• SOT-23-5 Package
cycle and ultra-low dropout operation.
APPLICATIONS
• TFT Monitor
• Auto PC
• Vehicle Security
• Navigation Systems
• Notebook Standby Supply
• Battery Powered Portable Applications
• Distributed Power Systems
Typical Application Circuit
1
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2004–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.