参数资料
型号: LT1776IS8#TR
厂商: Linear Technology
文件页数: 3/20页
文件大小: 0K
描述: IC REG BUCK ADJ 0.7A 8SOIC
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 ~ 34 V
输入电压: 7.4 V ~ 40 V
PWM 型: 电流模式,混合
频率 - 开关: 200kHz
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: 8-SOIC(0.154",3.90mm 宽)
包装: 带卷 (TR)
供应商设备封装: 8-SOIC
LT1776
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are T A = 25 ° C.
V IN = 40V, V SW open, V CC = 5V, V C = 1.4V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Timing
f
t ON(MIN)
Switching Frequency
Maximum Switch Duty Cycle
Minimum Switch On Time
High dV/dt Mode, R L = 39 ? (Note 4)
q
q
180
170
85
200
90
300
220
230
kHz
kHz
%
ns
Boost Operation
V C Pin Boost Threshold
dV/dt Below Threshold
dV/dt Above Threshold
Sync Function
1.35
0.2
1.6
V
V/ns
V/ns
Minimum Sync Amplitude
q
1.5
2.2
V
Synchronization Range
(Note 6)
q
250
400
kHz
SYNC Pin Input R
SHDN Pin Function
40
k ?
V SHDN
Shutdown Mode Threshold
0.5
V
q
0.2
0.8
V
Upper Lockout Threshold
Lower Lockout Threshold
Switching Action On
Switching Action Off
1.260
1.245
V
V
I SHDN
Shutdown Pin Current
V SHDN = 0V
V SHDN = 1.25V
12
2.5
20
10
μ A
μ A
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Control circuitry powered from V CC .
Note 3: Switch current limit is DC trimmed and tested in production.
Inductor dl/dt rate will cause a somewhat higher current limit in actual
application.
Note 4: Minimum switch on time is production tested with a 39 ? resistive
load to ground.
Note 5: Parts are guaranteed to survive 60V on V IN and V SW . However,
thermal constraints will limit V IN in some applications, depending primarily
on maximum output current and switching frequency. See Applications
section for more information.
Note 6: Internal oscillator is guaranteed to sync up to 400kHz. However,
thermal constraints and/or controllability issues may place a lower limit on
switching frequency in actual usage. See Applications section for more
information.
3
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