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LT1619EMS8 Datasheet

  • LT1619EMS8

  • Low Voltage Current Mode PWM Controller

  • 257.97KB

  • 20頁(yè)

  • LINER

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LT1619
Low Voltage Current Mode
PWM Controller
FEATURES
s
s
s
s
DESCRIPTIO
s
s
s
s
s
s
s
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
廬
Operation for High Efficiency
at Light Load
140碌A(chǔ) Quiescent Current
15碌A(chǔ) Shutdown Current
8-Lead MSOP and SO Packages
The LT
廬
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碌A(chǔ) and
shutdown current is 15碌A(chǔ).
The LT1619 is available in 8-lead MSOP and SO packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
APPLICATIO S
s
s
s
3.3V to 5V DC/DC Converters
Distributed Power Supplies
Isolated Power Supplies
TYPICAL APPLICATIO
V
IN
3.3V
37.4k
12.4k
1
2
3
S/S
FB
V
C
GND
V
IN
DRV
LT1619
GATE
SENSE
8
7
6
5
0.1碌F
+
EFFICIENCY (%)
C1
22碌F
0.1碌F
L1
5.6碌H
5A
V
OUT
5V
2.2A
M1
Si9804
D1
75k
220pF
15nF
4
+
C
OUT
440碌F
R
SENSE
0.01鈩?/div>
1619 F01
C1: PANASONIC EEFCDOK220R
C
OUT
: KEMET T495X227K010AS (脳2)
D1: MBRD835L
L1: COILCRAFT DO5022P-562
Figure 1. High Efficiency 3.3V to 5V DC/DC Converter
1619fa
U
Efficiency
95
90
85
80
75
70
1
10
100
LOAD CURRENT (mA)
1000
1619 F01a
U
U
1

LT1619EMS8 產(chǎn)品屬性

  • LT1619

  • 50

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 切換控制器

  • -

  • 電流模式

  • 1

  • 500kHz

  • 92%

  • 1.9 V ~ 18 V

  • 無(wú)

  • 是

  • 是

  • 無(wú)

  • 無(wú)

  • 無(wú)

  • 是

  • 是

  • -40°C ~ 85°C

  • 8-TSSOP，8-MSOP（0.118"，3.00mm 寬）

  • 管件

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