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LT1432CS8 Datasheet(PDF) 1 Page - Linear Technology

Part # LT1432CS8
Description  5V High Efficiency Step-Down Switching Regulator Controller
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1432CS8 Datasheet(HTML) 1 Page - Linear Technology

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1
LT1432
5V High Efficiency Step-Down
Switching Regulator Controller
S
FEATURE
The LT1432 is a control chip designed to operate with the
LT1170/LT1270 family of switching regulators to make a
very high efficiency 5V step-down (buck) switching regula-
tor. A minimum of external components is needed.
Included is an accurate current limit which uses only 60mV
sense voltage and uses “free” PC board trace material for
the sense resistor. Logic controlled electronic shutdown
mode draws only 15
µA battery current. The switching
regulator operates down to 6V input.
The LT1432 has a logic controlled “burst” mode to achieve
high efficiency at very light load currents (0 to 100mA) such
as memory keep-alive. In normal switching mode, the
standby power loss is about 60mW, limiting efficiency at
light loads. In burst mode, standby loss is reduced to
approximately 15mW. Output current in this mode is
typically in the 5mA to 100mA range.
The LT1432 is available in 8-pin surface mount and DIP
packages. The LT1170/LT1270 family will also be available
in a surface mount version of the 5-pin TO-220 package.
For 3.3V versions contact Linear Technology Corporation.
DESCRIPTIO
s
Accurate Preset +5V Output
s
Up to 90% Efficiency
s
Optional Burst Mode for Light Loads
s
Can be Used with Many LTC Switching ICs
s
Accurate Ultra-Low-Loss Current Limit
s
Operates with Inputs from 6V to 30V
s
Shutdown Mode Draws Only 15
µA
s
Uses Small 50
µH Inductor
S
APPLICATI
s
Laptop and Palmtop Computers
s
Portable Data-Gathering Instruments
s
DC Bus Distribution Systems
s
Battery-Powered Digital Widgets
0
60
70
80
90
100
1A
2A
3A
20mA
LT1432 TA02
40mA
60mA
0
NORMAL MODE
(USE AMPS SCALE)
BURST MODE
(USE mA SCALE)
LT1271, L = 50
µH
Efficiency
Figure 1. High Efficiency 5V Buck Converter
APPLICATI
TYPICAL
+
VSW
FB
GND
VIN
VC
LT1170
LT1271
VC
GND
VIN
MODE
DIODE
VOUT
VLIM
V+
+
C1
330
µF
35V
C6
0.02
µF
C4
0.1
µF
R1
680
C5
0.03
µF
D1
MBR330p
C3
4.7
µF
TANT
D2
1N4148
L1
50
µH
R2*
0.013
C2
390
µF
16V
VOUT
5V
3A**
+
×
MODE LOGIC
220pF
<0.3V = NORMAL MODE
>2.5V = SHUTDOWN
OPEN = BURST MODE
* R2 IS MADE FROM PC BOARD
COPPER TRACES.
** MAXIMUM CURRENT IS DETERMINED
BY THE CHOICE OF LT1070 FAMILY.
SEE APPLICATION SECTION.
LT1432
VIN
LT1432 TA01
OPTIONAL
OUTPUT
FILTER
100
µF
16V
10
µH
3A
+


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