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LTC1436A-PLL 数据表(PDF) 1 Page - Linear Technology

部件名 LTC1436A-PLL
功能描述  High Efficiency Low Noise Synchronous Step-Down Switching Regulators
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC1436A-PLL 数据表(HTML) 1 Page - Linear Technology

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1
LTC1436A
LTC1436A-PLL/LTC1437A
High Efficiency Low Noise
Synchronous Step-Down
Switching Regulators
Figure 1. High Efficiency Step-Down Converter
FEATURES
DESCRIPTION
, LTC and LT are registered trademarks of Linear Technology Corporation.
Adaptive Power is a trademark of Linear Technology Corporation.
s
Maintains Constant Frequency at Low Output Currents
s
Dual N-Channel MOSFET Synchronous Drive
s
Programmable Fixed Frequency (PLL Lockable)
s
Wide VIN Range: 3.5V to 36V Operation
s
Low Minimum On-Time (
300ns) for High
Frequency, Low Duty Cycle Applications
s
Very Low Dropout Operation: 99% Duty Cycle
s
Low Dropout, 0.5A Linear Regulator for CPU I/O
or Low Noise Audio Supplies
s
Built-In Power-On Reset Timer
s
Programmable Soft Start
s
Low-Battery Detector
s
Remote Output Voltage Sense
s
Foldback Current Limiting (Optional)
s
Pin Selectable Output Voltage
s
Logic Controlled Micropower Shutdown: IQ < 25µA
s
Output Voltages from 1.19V to 9V
s
Available in 24-Lead Narrow SSOP and 28-Lead
SSOP Packages
The LTC
®1436A/LTC1437A are synchronous step-down
switching regulator controllers that drive external
N-channel power MOSFETs in a phase lockable, fixed
frequency architecture. The Adaptive Power
TM output stage
selectively drives two N-channel MOSFETs at frequencies
up to 400kHz while reducing switching losses to maintain
high efficiencies at low output currents.
An auxiliary 0.5A linear regulator using an external PNP
pass device provides a low noise, low dropout voltage
source. A secondary winding feedback control pin (SFB)
guarantees regulation regardless of the load on the main
output by forcing continuous operation.
An additional comparator is available for use as a low-
battery detector. A power-on reset timer (POR) is included
which generates a signal delayed by 65536/fCLK (300ms
typically) after the output is within 5% of the regulated
output voltage. Internal resistive dividers provide pin
selectable output voltages with remote sense capability.
The operating current level is user-programmable via an
external current sense resistor. Wide input supply range
allows operation from 3.5V to 30V (36V maximum).
APPLICATIONS
s
Notebook and Palmtop Computers, PDAs
s
Cellular Telephones and Wireless Modems
s
Portable Instruments
s
Battery-Operated Devices
s
DC Power Distribution Systems
TYPICAL APPLICATION
COSC
RUN/SS
VIN
VPROG
+
+
+
VIN
4.5V TO 22V
CB
0.1
µF
4.7
µF
1000pF
LTC1436A
M1
Si4412DY
L1
4.7
µH
RSENSE
0.02
COUT
100
µF
6.3V
× 2
R1
35.7k
R2
102k
CIN
22
µF
35V
× 2
COSC
43pF
CSS
0.1
µF
CC
510pF
100pF
RC
10k
VOUT
1.6V
5A
M2
Si4412DY
D1
MBRS140T3
SENSE+
SENSE
SGND
M3
IRLML2803
DB
CMDSH-3
TGL
TGS
SW
BOOST
BG
PGND
1436 F01
INTVCC
ITH
VOSENSE


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