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LT1619 Datasheet(PDF) 1 Page - Linear Technology

Part No. LT1619
Description  Low Voltage Current Mode PWM Controller
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LT1619 Datasheet(HTML) 1 Page - Linear Technology

 
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1
LT1619
1619fa
Low Voltage Current Mode
PWM Controller
, LTC and LT are registered trademarks of Linear Technology Corporation.
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
µAand
shutdown current is 15
µA.
The LT1619 is available in 8-lead MSOP and SO packages.
s
Wide VIN Range: 1.9V to 18V
s
300kHz Fixed Frequency Current Mode Control
s
1A Rail-to-Rail N-Channel MOSFET Driver
s
Low 53mV Current Limit Threshold Voltage
Improves Efficiency
s
Implements Boost, SEPIC and Flyback Converters
Requiring Low Side Power Transistors
s
Internal Current Sense Amplifier
with Leading Edge Blanking
s
Up to 500kHz External Synchronization
s
Burst Mode
® Operation for High Efficiency
at Light Load
s
140
µA Quiescent Current
s
15
µA Shutdown Current
s
8-Lead MSOP and SO Packages
s
3.3V to 5V DC/DC Converters
s
Distributed Power Supplies
s
Isolated Power Supplies
Figure 1. High Efficiency 3.3V to 5V DC/DC Converter
Burst Mode is a registered trademark of Linear Technology Corporation.
LOAD CURRENT (mA)
75
80
85
90
95
1
100
1000
1619 F01a
70
10
Efficiency
FEATURES
DESCRIPTIO
APPLICATIO S
TYPICAL APPLICATIO
+
0.1
µF
0.1
µF
15nF
220pF
VIN
3.3V
L1
5.6
µH
5A
D1
M1
Si9804
VOUT
5V
2.2A
RSENSE
0.01
1619 F01
75k
37.4k
12.4k
C1
22
µF
C1: PANASONIC EEFCDOK220R
COUT: KEMET T495X227K010AS (×2)
D1: MBRD835L
L1: COILCRAFT DO5022P-562
+
COUT
440
µF
S/S
FB
VC
GND
8
7
6
5
1
2
3
4
VIN
DRV
GATE
SENSE
LT1619


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