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参数资料
| 型号： | LTC3125EDCB#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/18页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC ADJ 1.2A 8DFN |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2 V ~ 5.25 V |
| 输入电压： | 1.8 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1.6MHz |
| 电流 - 输出： | 1.2A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-DFN（3x2） |
LTC3125
TYPICAL PERFORMANCE CHARACTERISTICS (T A = 25°C unless otherwise noted)
V OUT and I IN During Soft-Start
100
Ef?ciency vs V IN
I LOAD = 200mA
V OUT
2V/DIV
SHDN
5V/DIV
INPUT
CURRENT
200mA/DIV
95 V OUT = 3.8V
90
85
80
75
70
V IN = 3.3V
V OUT = 4.5V
C OUT = 1F
L = 2.7μH
2s/DIV
3125 G20
65
60
55
50
2
3
4
5
V IN (V)
3125 G21
PIN FUNCTIONS
GND (Pin 1, Exposed Pad Pin 9): Ground. The exposed
pad must be soldered to the PCB ground plane for electrical
connection and for rated thermal performance.
FB (Pin 2): Feedback Input to the Error Ampli?er. Connect
the resistor divider tap to this pin. The top of the divider
connects to V OUT and the bottom of the divider connects
to GND. The output voltage can be adjusted from 1.8V
to 5.25V.
PROG (Pin 3): Programming Input for Average Input Cur-
rent. This pin should be connected to ground through an
external resistor (R PROG ) to set input average current limit
threshold. Refer to the Component Selection section in
Applications Information for details on selecting R PROG .
V IN (Pin 4): Input Voltage. The device is powered from V IN
until V OUT exceeds V IN . Once V OUT is greater than (V IN +
CS (Pin 5): Current Sense Resistor Connection Point.
Connect the inductor directly to CS. An internal 60mΩ
sense resistor is connected between CS and V IN .
SHDN (Pin 6): Logic Controlled Shutdown Input. Bringing
this pin above 1V enables the part, forcing this pin below
0.35V disables the part.
V OUT (Pin 7): Output Voltage Sense and the Output of the
Synchronous Recti?er. Connect the output ?lter capacitor
from V OUT to GND, close to the IC. A minimum value of
150μF is recommended. Due to the output disconnect
feature, V OUT is disconnected from V IN when SHDN is low.
SW (Pin 8): Switch Pin. Connect an inductor from this
pin to CS. An internal anti-ringing resistor is connected
across SW and CS after the inductor current has dropped
near zero.
0.25V), the device is powered from V OUT . Place a ceramic
bypass capacitor from V IN to GND. A minimum value of
1μF is recommended. Also connects to CS through 60mΩ
internal sense resistor.
3125fa
6
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