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参数资料
| 型号： | LT1614IS8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 5/16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
PI N FU N CTIO N S
NFB (Pin 1): Negative Feedback Pin. Reference voltage is
– 1.24V. Connect resistive divider tap here. The sug-
gested value for R2 is 24.9k. Set R1 and R2 according to:
GND (Pin 4): Ground. Connect directly to local ground
plane.
SW (Pin 5): Switch Pin. Minimize trace area at this pin to
+ ? 4 . 5 ? 10 – 6 ??
R 1 =
| V OUT | – 1 . 24
1 .24 ?
R 2
keep EMI down.
V IN (Pin 6): Supply Pin. Must have 1 μ F ceramic bypass
capacitor right at the pin, connected directly to ground.
V C (Pin 2): Compensation Pin for Error Amplifier. Con-
nect a series RC from this pin to ground. Typical values
are 100k ? and 1nF. Minimize trace area at V C .
SHDN (Pin 3): Shutdown. Ground this pin to turn off
switcher. Must be tied to V IN (or higher voltage) to enable
switcher. Do not float the SHDN pin.
BLOCK DIAGRA M
V IN
LBI (Pin 7): Low-Battery Detector Input. 200mV refer-
ence. Voltage on LBI must stay between ground and
700mV. Float this pin if not used.
LBO (Pin 8): Low-Battery Detector Output. Open collec-
tor, can sink 10 μ A. A 1M ? pull-up is recommended. Float
this pin if not used. The low-battery detector is disabled
when SHDN is low. LBO is high-Z in this state.
6
R5
R6
V IN
40k
40k
+
g m
V C
2
SHUTDOWN
SHDN
3
Q1
Q2
× 10
–
ERROR
AMPLIFIER
A1
+
ENABLE
LBI
7
+
LBO
8
R3
30k
BIAS
–
200mV
–
A4
R4
140k
COMPARATOR
SW
V OUT
R1
(EXTERNAL)
NFB
R2
(EXTERNAL)
1
NFB
RAMP
GENERATOR
600kHz
OSCILLATOR
+
Σ
+
A2
R
FF
S
Q
DRIVER
+
A=3
–
5
Q3
0.15 ?
4
GND
1614 BD
Figure 2. Block Diagram
5
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