参数资料
型号: LT1612ES8
厂商: Linear Technology
文件页数: 5/12页
文件大小: 0K
描述: IC REG BUCK SYNC ADJ 0.5A 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: 可调至 0.6V
输入电压: 2 V ~ 5.5 V
PWM 型: 电流模式,混合
频率 - 开关: 800kHz
电流 - 输出: 500mA
同步整流器:
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: 管件
供应商设备封装: 8-SOIC
LT1612
PI N FU N CTIO N S
V C (Pin 1): Compensation Pin. This is the current sink/
source output of the error amplifier. By connecting an RC
network from this pin to ground, frequency response can
be tuned for a wide range of circuit configurations. The
voltage at this pin also sets the current limit, and if
grounded, the switch will remain in the OFF state.
FB (Pin 2): Feedback Pin. This pin is the negative input to
the error amplifier. Connect the resistor divider tap to this
point which sets V OUT according to:
V OUT = 0.62V (1 + R1/R2)
V IN (Pin 3): Supply Pin. Bypass capacitor C1 must be right
next to this pin.
GND (Pin 4): Ground Pin. Connect directly to local ground
plane.
BLOCK DIAGRA
R SENSE
0.08 ?
V IN 3
V C 1
SW (Pin 5): Switch Pin. Connect inductor and boost
capacitor here. Minimize trace area at this pin to keep EMI
down.
BOOST (Pin 6): This is the supply pin for the switch driver
and must be above V IN by 1.5V for proper switch opera-
tion. Connect the boost capacitor to this pin.
MODE (Pin 7): Burst Mode Operation Disable Pin. For
continuous switching operation (low noise), pull this pin
above 2V. For Burst Mode operation which gives better
light load efficiency, tie to ground. Output ripple voltage in
Burst Mode operation is typically 30mV P-P . See applica-
tions section for more information about this function.
SHDN (Pin 8): Shutdown Pin. Pull this pin low for shut-
down mode. Tie to a voltage between 2V and 5.5V for
normal operation.
BOOST DIODE
6 BOOST
FB 2
A1
V/I
+
A2
SLOPE
COMPENSATION
0.62V
SWITCH
SWITCH
MODE
7
0.7V
A3
+
DRIVER
5 SW
FLIP-FLOP
SHDN
8
SHUTDOWN
ENABLE
OSCILLATOR
R
S
Q
RECTIFIER
DRIVE
RECTIFIER
4 GND
1612 BD
sn1612 1612fs
5
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