参数资料
型号: LT1938IDD#TRPBF
厂商: Linear Technology
文件页数: 3/24页
文件大小: 0K
描述: IC REG BUCK ADJ 2.2A 10DFN
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: 1.27 V ~ 20 V
输入电压: 3.6 V ~ 25 V
PWM 型: 电流模式
频率 - 开关: 300kHz ~ 2.8MHz
电流 - 输出: 2.2A
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: 10-WFDFN 裸露焊盘
包装: 带卷 (TR)
供应商设备封装: 10-DFN(3x3)
LT1938
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T A = 25°C. V IN = 10V, V RUN/SS = 10V V BOOST = 15V, V BIAS = 3.3V unless otherwise
noted. (Note 2)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Error Amp g m
Error Amp Gain
V C Source Current
V C Sink Current
V C Pin to Switch Current Gain
V C Clamp Voltage
330
1000
75
100
3.5
2
μMho
μA
μA
A/V
V
Switching Frequency
Minimum Switch Off-Time
Switch Current Limit
Switch V CESAT
R T = 8.66k
R T = 29.4k
R T = 187k
Duty Cycle = 5%
I SW = 2A
2.7
1.25
250
3.1
3.0
1.4
300
100
3.6
360
3.3
1.55
350
150
4.0
MHz
MHz
kHz
nS
A
mV
Boost Schottky Reverse Leakage
Minimum Boost Voltage (Note 4)
BOOST Pin Current
RUN/SS Pin Current
V SW = 10V, V BIAS = 0V
I SW = 1A
V RUN/SS = 2.5V
0.02
1.6
18
5
2
2.1
30
10
μA
V
mA
μA
RUN/SS Input Voltage High
RUN/SS Input Voltage Low
2.5
0.2
V
V
PG Threshold Offset from Feedback Voltage
PG Hysteresis
V FB Rising
100
10
mV
mV
PG Leakage
V PG = 5V
0.1
1
μA
PG Sink Current
V PG = 0.4V
100
300
μA
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LT1938E is guaranteed to meet performance specifications
from 0°C to 125°C. Specifications over the –40°C to 125°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LT1938I specifications are
guaranteed over the –40°C to 125°C temperature range.
Note 3: Bias current measured in regulation. Bias current flows into the FB
pin.
Note 4: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the switch.
1938fa
3
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