LT1776I View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LT1776I Datasheet PDF : 20 Pages
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LT1776
TYPICAL APPLICATION
VIN
10V TO 30V
(SEE TEXT)
U3
LT1121-5
Wide VIN Range, High Efficiency Battery Charger
+ C1
39µF
63V
5
1
VIN
7
SHDN FB
2
VCC
C5
U1
100pF
LT1776
VSW
3
6
8
SYNC
VC
GND
4
C3
100pF
C4
2200pF
R3
22k
L1
100µH
R4
0.5Ω
D1
MBRS1100
+ C2
100µF
10V
R1
46.4k
1%
R2
12.1k
1%
BATTERY
C6
0.33µF
C7
0.1µF
C8 +
6
1µF
8
VCC
2
AVG
IOUT
R5
U2
3k
7
LT1620
PROG IN +
5
1
NC SENSE
IN – 4
R6
12k
GND
3
1776 TA02
C1: PANASONIC HFQ
C2: AVX TPSD107M010R0080
L1: COILCRAFT DO3316P-104
Battery Charger Efficiency —
Constant VOUT Region
90
80
70
VIN = 12V
60
VIN = 24V
50
40
30
20
10
100
LOAD CURRENT (mA)
1000
1776 TA03
Battery Charger Efficiency —
Constant IOUT Region
90
80
70
VIN = 12V
60
VIN = 24V
50
40
30
20
0
1
2
3
4
5
6
OUTPUT VOLTAGE (V)
1776 TA04
Battery Charger Output Voltage
vs Output Current
7
6
5
4
3
2
1
0
0
50 100 150 200 250
OUTPUT CURRENT (mA)
1776 TA05
RELATED PARTS
PART NUMBER
LT1076
LTC®1149
LT1374
LT1375/LT1376
LT1620
LT1676
LT1777
DESCRIPTION
2A, 100kHz Step-Down Switching Regulator
High Efficiency Synchronous Step-Down Switching Regulator
4.5A, 500kHz Step-Down Switching Regulator
1.5A, 500kHz Step-Down Switching Regulators
Rail-to-Rail Current Sense Amplifier
Wide Input Range, High Efficiency, Step-Down Switching Regulator
Low Noise Buck Regulator
COMMENTS
Operation Up to 45V Input (64V for HV Version)
Operation Up to 48V Input, 95% Efficiency, 100% Duty Cycle
Converts 12V to 3.3V at 2.5A in SO-8 Package
Operation Up to 25V Input, Synchronizable (LT1375)
Transforms Switching Regulators into High Efficiency
Battery Chargers
7.4V to 60V Input, 100kHz Operation, 700mA Internal Switch
Operation up to 48V, Controlled Voltage and Current
Slew Rates
20 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 q FAX:(408)434-0507 q www.linear-tech.com
sn1776 1776fs LT/TP 0499 4K • PRINTED IN
USA
© LINEAR TECHNOLOGY CORPORATION 1998
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