参数资料
型号: LT1976EFE
厂商: Linear Technology
文件页数: 22/28页
文件大小: 0K
描述: IC REG BUCK ADJ 1.5A 16TSSOP
标准包装: 95
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 1.2 V ~ 54 V
输入电压: 3.3 V ~ 60 V
PWM 型: 电流模式,混合
频率 - 开关: 200kHz
电流 - 输出: 1.5A
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-TSSOP(0.173",4.40mm)裸露焊盘
包装: 管件
供应商设备封装: 16-TSSOP-EP
LT1976/LT1976B
APPLICATIO S I FOR ATIO
(I CT ) from the C T pin into the external capacitor. When the
voltage on the external capacitor reaches an internal clamp
(V CT ), the PG pin becomes a high impedance node. The
V OUT
500mV/DIV
PG
100k TO V IN
V CT
500mV/DIV
V SHDN
2V/DIV
resultant PG delay time is given by t = C CT ? (V CT )/(I CT ). If
the voltage on the PGFB pin drops below its V PGFB , C CT will
be discharged rapidly and PG will be active low with a
200 μ A sink capability. If the SHDN pin is taken below its
threshold during normal operation, the C T pin will be
discharged and PG inactive, resulting in a non Power Good
cycle when SHDN is taken above its threshold. Figure 9
shows the power good operation with PGFB connected to
FB and the capacitance on C T = 0.1 μ F. The PGOOD pin has
a limited amount of drive capability and is susceptible to
noise during start-up and Burst Mode operation. If erratic
operation occurs during these conditions a small filter
capacitor from the PGOOD pin to ground will ensure
TIME (10ms/DIV)
1976 F09
proper operation. Figure 10 shows several different con-
Figure 9. Power Good
PG at 80% V OUT with 100ms Delay
figurations for the LT1976 Power Good circuitry.
PG at V IN > 4V with 100ms Delay
V IN
200k
V IN
200k
PG
LT1976
PGFB
153k
12k
V OUT = 3.3V
C OUT
PG
LT1976
PGFB
511k
200k
165k
V OUT = 3.3V
C OUT
FB
FB
C T
100k
C T
100k
0.27 μ F
V OUT Disconnect at 80% V OUT
with 100ms Delay
V IN
200k
PG
0.27 μ F
V OUT Disconnect 3.3V Logic Signal
with 100 μ s Delay
V IN
200k
PG
LT1976
153k
C OUT
V OUT = 3.3V
LT1976
C OUT
V OUT = 12V
PGFB
FB
12k
PGFB
FB
866k
C T
0.27 μ F
100k
C T
270pF
100k
1976 F10
Figure 10. Power Good Circuits
1976bfg
22
相关PDF资料
PDF描述
LT3512HMS#PBF IC REG FLYBK ISO ADJ .42A 16MSOP
LT3579IFE-1#TRPBF IC REG MULTI CONFIG SYNC 20TSSOP
HM77-12003LFTR LOW PROFILE INDUCTORS
EBM44DSAN CONN EDGECARD 88POS R/A .156 SLD
EBM44DSAH CONN EDGECARD 88POS R/A .156 SLD
相关代理商/技术参数
参数描述
LT1976EFE#PBF 功能描述:IC REG BUCK ADJ 1.5A 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压(降压) 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON(1.45x1) 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2
LT1976EFE#TR 功能描述:IC REG BUCK ADJ 1.5A 16TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压(升压) 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型,TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT
LT1976EFE#TRPBF 功能描述:IC REG BUCK ADJ 1.5A 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压(升压) 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型,TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT
LT1976EFEPBF 制造商:Linear Technology 功能描述:LT1976 adj PWM 1.5A SD dc-dc converter 制造商:Linear Technology 功能描述:DC-DC Converter Step-Down 60V TSSOP16EP
LT1976HFE 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage 1.5A, 200kHz Step-Down Switching Regulator with 100μA Quiescent Current