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| LM3475 Datasheet, PDF (1/25 Pages) National Semiconductor (TI) – Hysteretic PFET Buck Controller | |||
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LM3475
SNVS239C â OCTOBER 2004 â REVISED OCTOBER 2015
LM3475 Hysteretic PFET Buck Controller
1 Features
â¢1 Easy-to-Use Control Methodology
⢠0.8 V to VIN Adjustable Output Range
⢠High Efficiency (90% Typical)
⢠±0.9% (±1.5% Over Temperature) Feedback
Voltage
⢠100% Duty Cycle Capable
⢠Maximum Operating Frequency up to 2 MHz
⢠Internal Soft-Start
⢠Enable Pin
2 Applications
⢠TFT Monitor
⢠Auto PC
⢠Vehicle Security
⢠Navigation Systems
⢠Notebook Standby Supply
⢠Battery Powered Portable Applications
⢠Distributed Power Systems
3 Description
The LM3475 is a hysteretic P-FET buck controller
designed to support a wide range of high efficiency
applications in a very small SOT-23-5 package. The
hysteretic control scheme has several advantages,
including simple system design with no external
compensation, stable operation with a wide range of
components, and extremely fast transient response.
Hysteretic control also provides high efficiency
operation, even at light loads. The PFET architecture
allows for low component count as well as 100% duty
cycle and ultra-low dropout operation.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM3475
SOT-23 (5)
1.60 mm à 2.90 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application
VIN = 5V
CIN
10 PF
Q1
Si2343
5
D1
PGATE
4
2
VIN
GND
LM3475
L1
10 PH
COUT
100 PF
CFF
1 nF
VOUT = 2.5V/2A
RFB1
2.15k
3
EN
1
FB
RFB2
1k
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
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