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参数资料
| 型号： | LT1614IS8#TR |
| 厂商： | Linear Technology |
| 文件页数： | 11/16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
APPLICATIO N S I N FOR M ATIO N
Shutdown Pin
3.3V
The LT1614 has a Shutdown pin (SHDN) that must be
grounded to shut the device down or tied to a voltage equal
or greater than V IN to operate. The shutdown circuit is
shown in Figure 13.
R1
R2
100k
LBI
+
–
V IN
LT1614
LBO
1M
TO PROCESSOR
Note that allowing SHDN to float turns on both the start-
up current (Q2) and the shutdown current (Q3) for V IN >
2V BE . The LT1614 doesn’t know what to do in this situation
200mV
INTERNAL
REFERENCE
GND
1614 F14
R1 =
V LB – 200mV
2 μ A
and behaves erratically. SHDN voltage above V IN is al-
lowed. This merely reverse-biases Q3’s base emitter junc-
tion, a benign condition. The low-battery detector is dis-
abled when SHDN is low.
Figure 14. Setting Low-Battery Detector Trip Point
V IN
Q3
2N3906
200k
LBO
V IN
SHDN
R2
400k
200k
SHUTDOWN
CURRENT
V REF
200mV
10k
+
10 μ F
LBI
LT1614
GND
1614 F15
START-UP
CURRENT
Q2
Q1
1614 F13
Figure 13. Shutdown Circuit
Low-Battery Detector
The LT1614’s low-battery detector is a simple PNP input
Figure 15. Accessing 200mV Reference
Coupled Inductors
The applications shown in this data sheet use two un-
coupled inductors because the Murata units specified are
small and inexpensive. This topology can also be used
with a coupled inductor as shown in Figure 16. Be sure to
get the phasing right.
gain stage with an open collector NPN output. The nega-
tive input of the gain stage is tied internally to a 200mV
V IN
L1A
10 μ H
?
C3
1 μ F
?
L1B
10 μ H
reference. The positive input is the LBI pin. Arrangement
as a low-battery detector is straightforward. Figure 14
details hookup. R1 and R2 need only be low enough in
value so that the bias current of the LBI pin doesn’t cause
large errors. For R2, 100k is adequate. The 200mV refer-
5V
+
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
ence can also be accessed as shown in Figure 15. The low-
battery detect is not operative when the device is shut
1nF
down.
C1, C2: AVX TAJB336M010
C3: AVX 1206CY106
1614 F16
D1: MBR0520
L1: COILTRONICS CTX10-1
Figure 16. 5V to – 5V Converter with Coupled Inductor
11
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