参数资料
型号: LT1777IS#TRPBF
厂商: Linear Technology
文件页数: 1/24页
文件大小: 0K
描述: IC REG BUCK ADJ 0.7A 16SOIC
标准包装: 2,500
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 1.24 V ~ 30 V
输入电压: 12 V ~ 48 V
PWM 型: 电流模式
频率 - 开关: 100kHz
电流 - 输出: 700mA
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 16-SOIC(0.154",3.90mm 宽)
包装: 带卷 (TR)
供应商设备封装: 16-SOIC
LT1777
Low Noise Step-Down
Switching Regulator
FEATURES
DESCRIPTIO
s
s
s
s
s
s
s
s
s
Programmable dI/dt Limit
Internally Limited dV/dt
High Input Voltage: 48V Max
700mA Peak Switch Rating
True Current Mode Control
100kHz Fixed Operating Frequency
Synchronizable to 250kHz
Low Supply Current in Shutdown: 30 μ A
Low Thermal Resistance 16-Pin SO Package
The LT ? 1777 is a Buck (step-down) regulator designed for
noise sensitive applications. It contains a dI/dt limiting
circuit programmed via a small external inductor in the
switching path. Internal circuitry also generates controlled
dV/dt ramp rates.
The monolithic die includes all oscillator, control and
protection circuitry. The part can accept operating input
voltages as high as 48V, and contains an output switch
rated at 700mA peak current. Current mode control offers
excellent dynamic input supply rejection and short-circuit
Automotive Cellular and GPS Receivers
Telecom Power Supplies
Industrial Instrument Power Supplies
APPLICATIO  S
s
s
s
protection. The internal control circuitry is normally pow-
ered via the V CC pin, thereby minimizing power drawn
directly from the V IN supply (see Applications Informa-
tion). The fused-lead SO16 package and 100kHz switch-
ing frequency allow for minimal PC board area
requirements.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Low Noise 5V Step-Down Supply
V SW Switching Waveforms
V IN
24V
+
39 μ F
63V
3
10
V IN
SHDN V CC
4
100pF
100pF 12k
12
14
LT1777
SYNC V SW
V C V D
FB
6
5
13
1 μ H*
220 μ H
MBRS1100
+
100 μ F
10V
36.5k
1%
V OUT
5V
400mA
V SW
VOLTAGE
10V/DIV
2200pF
*PROGRAMS dI/dT
SGND
7
12.1k
1%
1777 TA01
V SW
CURRENT
200mA/DIV
1777 TA02
500ns/DIV
1
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