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| 型号： | LT1614IS8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/16页 |
| 文件大小： | 0K |
| 描述： | IC REG INV ADJ 0.5A 8SOIC |
| 标准包装： | 2,500 |
| 类型： | 反相 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 -24V |
| 输入电压： | 0.8 V ~ 5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 600kHz |
| 电流 - 输出： | 500mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-SOIC |
LT1614
Inverting 600kHz
Switching Regulator
FEATURES
DESCRIPTIO
s
s
s
s
s
s
s
s
s
Better Regulation Than a Charge Pump
0.1 ? Effective Output Impedance
– 5V at 200mA from a 5V Input
600kHz Fixed Frequency Operation
Operates with V IN as Low as 1V
1mA Quiescent Current
Low Shutdown Current: 10 μ A
Low-Battery Detector
Low V CESAT Switch: 295mV at 500mA
The LT ? 1614 is a fixed frequency, inverting mode switch-
ing reglator that operates from an input voltage as low as
1V. Utilizing a low noise topology, the LT1614 can gener-
ate a negative output down to – 24V from a 1V to 5V input.
Fixed frequency switching ensures a clean output free
from low frequency noise. The device contains a low-
battery detector with a 200mV reference and shuts down
to less than 10 μ A. No load quiescent current of the LT1614
is 1mA and the internal NPN power switch handles a
500mA current with a voltage drop of just 295mV.
APPLICATIO S
High frequency switching enables the use of small induc-
s
s
s
s
MR Head Bias
LCD Bias
GaAs FET Bias
Positive-to-Negative Conversion
tors and capacitors. Ceramic capacitors can be used in
many applications, eliminating the need for bulky tanta-
lum types.
The LT1614 is available in 8-lead MSOP or SO packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
V IN
5V
L1
22 μ H
C3
1 μ F
L2
22 μ H
90
5V to – 5V Converter Efficiency
+
C1
33 μ F
100k
V IN
SHDN
LT1614
V C
GND
SW
NFB
69.8k
24.9k
D1
V OUT
– 5V
200mA
C2
33 μ F
80
70
1nF
60
C1, C2: AVX TAJB336M010
C3: TAIYO YUDEN EMK316BJ105MF
D1: MBR0520
L1, L2: MURATA LQH3C220
1614 TA01
50
40
Figure 1. 5V to – 5V/200mA Converter
3
10 30 100
LOAD CURRENT (mA)
300
1614 TA02
1
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