参数资料
型号: LT1959IS8#PBF
厂商: Linear Technology
文件页数: 1/24页
文件大小: 0K
描述: IC REG BUCK ADJ 4.5A 8SOIC
标准包装: 100
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 1.21 V ~ 38 V
输入电压: 4.3 V ~ 15 V
PWM 型: 电流模式
频率 - 开关: 500kHz
电流 - 输出: 4.5A
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
包装: 管件
供应商设备封装: 8-SOIC
LT1959
4.5A, 500kHz Step-Down
Switching Regulator
FEATURES
DESCRIPTIO
s
s
s
s
s
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Operates with Input as Low as 4V
Output Range Down to 1.21V
Constant 500kHz Switching Frequency
Uses All Surface Mount Components
Inductor Size Reduced to 1.8 μ H
Saturating Switch Design: 0.07 ?
Shutdown Current: 15 μ A
Easily Synchronizable
Cycle-by-Cycle Current Limiting
4.5A Switch
Current Mode Control
The LT ? 1959 is a 500kHz monolithic buck mode switching
regulator functionally identical to the LT1506 but optimized
for lower output voltage applications. It will operate down
to 1.21V output compared to 2.42V for the LT1506. A 4.5A
switch is included on the die along with all the necessary
oscillator, control and logic circuitry. High switching fre-
quency allows a considerable reduction in the size of ex-
ternal components. The topology is current mode for fast
transient response and good loop stability.
A special high speed bipolar process and new design tech-
niques achieve high efficiency at high switching frequency.
APPLICATIO S
Efficiency is maintained over a wide output current range
by keeping quiescent supply current to 3.8mA and by uti-
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Portable Computers
Battery-Powered Systems
Battery Chargers
Distributed Power
5V to 3.3V Conversion
5V to 2.5V Conversion
5V to 1.8V Conversion
lizing a supply boost capacitor to saturate the power switch.
The LT1959 fits into standard 7-pin DD and fused lead
SO-8 packages. Full cycle-by-cycle short-circuit protection
and thermal shutdown are provided. Standard surface
mount external parts are used, including the inductor and
capacitors. There is the optional function of shutdown or
synchronization. A shutdown signal reduces supply current
to 15 μ A. Synchronization allows an external logic level sig-
nal to increase the internal oscillator from 580kHz to 1MHz.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO N
Efficiency vs Load Current
5V to 1.8V Down Converter
D2
1N914
90
V OUT = 3.3V
V IN = 5V
L = 10 μ H
INPUT
5V
C3
10 μ F TO
50 μ F
CERAMIC
+
OPEN
OR
HIGH
= ON
V IN
SHDN
BOOST
LT1959
GND V C
V SW
FB
C C
1.5nF
C2
0.68 μ F
L1
5 μ H
D1
MBRS330T3
R1
1.21k
R2
2.49k
+
OUTPUT
1.8V
4A
C1
100 μ F, 10V
SOLID
TANTALUM
85
80
75
70
0
0.5
1.0
1.5
2.0 2.5 3.0
3.5
4.0
1959 TA01
LOAD CURRENT (A)
1959 TA02
1
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