参数资料
型号: LT1619EMS8
厂商: Linear Technology
文件页数: 1/20页
文件大小: 0K
描述: IC REG CTRLR PWM CM 8-MSOP
标准包装: 50
PWM 型: 电流模式
输出数: 1
频率 - 最大: 500kHz
占空比: 92%
电源电压: 1.9 V ~ 18 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 8-TSSOP,8-MSOP(0.118",3.00mm 宽)
包装: 管件
LT1619
Low Voltage Current Mode
PWM Controller
FEATURES
DESCRIPTIO
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Wide V IN Range: 1.9V to 18V
300kHz Fixed Frequency Current Mode Control
1A Rail-to-Rail N-Channel MOSFET Driver
Low 53mV Current Limit Threshold Voltage
Improves Efficiency
Implements Boost, SEPIC and Flyback Converters
Requiring Low Side Power Transistors
Internal Current Sense Amplifier
with Leading Edge Blanking
Up to 500kHz External Synchronization
Burst Mode ? Operation for High Efficiency
at Light Load
140 μ A Quiescent Current
15 μ A Shutdown Current
8-Lead MSOP and SO Packages
The LT ? 1619 is a fixed frequency PWM controller for
implementing current mode DC/DC converters with mini-
mum external parts. The LT1619 operates with input
voltages ranging from 1.9V to 18V and is suitable for a
variety of battery-powered and distributed DC/DC con-
verters. The internal rail-to-rail N-channel MOSFET driver
operates either from the input in the nonbootstrapped
mode or from the output in bootstrapped operation. The
driver is designed to drive a low side power transistor in
boost, SEPIC, flyback and other topologies.
Converter efficiency is improved at heavy loads with a
53mV current sense voltage and at light load with Burst
Mode operation. The operating frequency is internally set
at 300kHz. The oscillator can also be synchronized exter-
nally up to 500kHz. No load quiescent current is 140 μ A and
shutdown current is 15 μ A.
APPLICATIO S
The LT1619 is available in 8-lead MSOP and SO packages.
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3.3V to 5V DC/DC Converters
Distributed Power Supplies
Isolated Power Supplies
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
V IN
3.3V
95
Efficiency
12.4k
37.4k
1
2
S/S
FB
V IN
DRV
8
7
0.1 μ F
+
C1
22 μ F
L1
5.6 μ H
5A
V OUT
90
85
220pF
75k
15nF
3
4
LT1619
V C GATE
GND SENSE
6
5
0.1 μ F
M1
Si9804
R SENSE
0.01 ?
D1
+
5V
2.2A
C OUT
440 μ F
80
75
C1: PANASONIC EEFCDOK220R
C OUT : KEMET T495X227K010AS ( × 2)
D1: MBRD835L
1619 F01
70
1
10 100
LOAD CURRENT (mA)
1000
L1: COILCRAFT DO5022P-562
1619 F01a
Figure 1. High Efficiency 3.3V to 5V DC/DC Converter
1619fa
1
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LT1619EMS8#TRPBF 功能描述:IC REG CTRLR PWM CM 8-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR)
LT1619EMS8PBF 制造商:Linear Technology 功能描述:PWM Controller Current Mode 1.5A MSOP8
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