LTC1622
TYPICAL APPLICATION
U
Small Footprint 3.3V/1A Regulator
Efficiency vs Load Current
100
90
80
70
60
50
V
IN
3.3V TO
8.5V
V
= 3.5V
IN
+
+
C1
R2
10µF
16V
0.025Ω
1
2
3
4
8
7
6
5
–
SENSE
V
IN
CERAMIC
L1
2.2µH
I
PDRV
V
= 4.2V
IN
M1
TH
LTC1622
GND
V
3.3V
1A
OUT
V
= 6V
IN
V
FB
R1
R3
232k
10k
SYNC/
MODE
D1
RUN/
SS
C2
47µF
6V
C3
220pF
C4
560pF
R4
75k
V
R
= 3.3V
OUT
SENSE
= 0.025Ω
1622 TA05
1
10
100
1000
C1: MURATA CERAMIC GRM235Y5V106Z
C2: SANYO POSCAP 6TPA47M
D1: MOTOROLA MBRS120LT3
L1: COILCRAFT D01608C-222
M1: SILICONIX Si3443DY
R2: DALE WSL-2010 0.025Ω
LOAD CURRENT (mA)
1622 TA05b
Efficiency vs Load Current With LTC1622
Configured as Boost Converter
Boost Converter 3.3V/2.5A
100
V
R
= 5V
SENSE
OUT
1
8
V
–
IN
3.3V
= 0.015Ω
SENSE
V
IN
+
C1
R2
C6
90
80
70
60
50
100µF
10V
0.015Ω
2
3
4
7
6
5
0.1µF
V
= 3.3V
I
TH
PDRV
IN
LTC1622
C3
V
5V
2.5A
OUT
470pF
L1
4.6µH
V
FB
GND
R3
M1
SYNC/
MODE
RUN/
SS
105k
C2
R1
33k
+
220µF
10V
D1
R4
20k
C5
150pF
C4
0.1µF
×2
Si6801DQ
1622 TA06a
C1, C2: SANYO POSCAP TPB SERIES M1: SILICONIX Si3442DV
0.001
0.01
0.1
1
D1: MOTOROLA MBRD835L
L1: SUMIDA CEP123-4R6
R2: DALE WS-L2512 0.015Ω
LOAD CURRENT (mA)
1622 TA06b
RELATED PARTS
PART NUMBER
LTC1147 Series
LT1375/LT1376
DESCRIPTION
COMMENTS
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IN
IN
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IN
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LTC1474/LTC1475
LTC1624
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Dual High Efficiency 2-Phase Step-Down Controller
SOT-23 Current Mode Step-Down Controller
Multiple Output Capability, 3.5V ≤ V ≤ 36V
IN
Monolithic, MSOP, I
= 10µA
OUT
8-Pin N-Channel Drive, 3.5V ≤ V ≤ 36V
IN
LTC1626
Monolithic, Constant Off-Time, 2.5V ≤ V ≤ 6V
IN
LTC1627/LTC1707
LTC1628
Low Supply Voltage Range: 2.65V to 8V, 0.5A
Antiphase Drive, 3.5V ≤ V ≤ 36V, Protection
IN
LTC1772
6-Lead SOT-23, 2.5V ≤ V ≤ 9.8V, 550kHz
IN
LTC1735
High Efficiency, Low Noise Synchronous Switching Controller
Burst Mode Operation, Protection, 3.5V ≤ V ≤ 36V
IN
1622f LT/TP 0100 4K • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
16
●
●
LINEAR TECHNOLOGY CORPORATION 1998
(408)432-1900 FAX:(408)434-0507 www.linear-tech.com
Linear [ Linear ]
