参数资料
型号: LT1777IS#TRPBF
厂商: Linear Technology
文件页数: 3/24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
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at T J = 25 ° C.
V IN = 24V, V SW Open, V CC = 5V, V C = 1.4V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Output Switch
R ON
Output Switch On Voltage
I SW = 0.5A
1.0
1.5
V
I LIM
Switch Current Limit
(Note 3)
q
0.55
0.70
1.0
A
Output dl/dt Sense Voltage
1.3
V
q
0.6
2.0
V
Current Amplifier
Control Pin Threshold
Duty Cycle = 0%
0.9
1.1
1.25
V
Timing
Control Voltage to Switch Transconductance
2
A/V
f
Switching Frequency
Maximum Switch Duty Cycle
q
q
90
85
85
100
90
110
115
kHz
kHz
%
Sync Function
Minimum Sync Amplitude
Synchronization Range
SYNC Pin Input R
q
q
130
1.5
40
2.2
250
V
kHz
k ?
SHDN Pin Function
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 4: During normal operation the V SW pin may fly as much as 3V
below ground. However, the LT1777 may not be used in an inverting
DC/DC configuration.
Note 3: Switch current limit is DC trimmed and tested in production.
Inductor dI/dt rate will cause a somewhat higher current limit in actual
application.
3
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