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參數(shù)資料
| 型號(hào)： | LT1432CS8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 5V High Efficiency Step-Down Switching Regulator Controller |
| 中文描述： | SWITCHING CONTROLLER, PDSO8 |
| 封裝： | PLASTIC, SO-8 |
| 文件頁(yè)數(shù)： | 1/28頁(yè) |
| 文件大小： | 611K |
| 代理商： | LT1432CS8 |
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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
μ
A 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.
D
U
ESCRIPTIO
I
Accurate Preset +5V Output
I
Up to 90% Efficiency
I
Optional Burst Mode for Light Loads
I
Can be Used with Many LTC Switching ICs
I
Accurate Ultra-Low-Loss Current Limit
I
Operates with Inputs from 6V to 30V
I
Shutdown Mode Draws Only 15
μ
A
I
Uses Small 50
μ
H Inductor
U
S
A
O
PPLICATI
I
Laptop and Palmtop Computers
I
Portable Data-Gathering Instruments
I
DC Bus Distribution Systems
I
Battery-Powered Digital Widgets
0
0
60
E
70
80
90
100
1A
20mA
2A
40mA
3A
LT1432 TA02
60mA
NORMAL MODE
(USE AMPS SCALE)
BURST MODE
(USE mA SCALE)
LT1271, L = 50
μ
H
Efficiency
Figure 1. High Efficiency 5V Buck Converter
U
A
O
PPLICATI
TYPICAL
V
IN
+
V
SW
FB
GND
V
IN
V
C
LT1170
LT1271
V
C
GND
V
IN
MODE
DIODE
V
OUT
V
LIM
V
+
+
C1
330
μ
F
35V
C6
0.02
μ
F
C4
0.1
μ
F
R1
680
C5
0.03
μ
F
D1
MBR330p
C3
4.7
μ
F
TANT
D2
1N4148
L1
50
μ
H
R2*
0.013
C2
390
μ
F
16V
V
OUT
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
LT1432 TA01
OPTIONAL
OUTPUT
FILTER
100
μ
F
16V
10
μ
H
3A
+
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