Datasheet
16
LTC1622
sn1622 1622fs LT/TP 1001 4K • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1998
TYPICAL APPLICATION
U
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear-tech.com
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
LTC1147 Series High Efficiency Step-Down Switching Regulator Controllers 100% DC, 3.5V ≤ V
IN
≤ 16V, HV Version Has 20V
IN
LT1375/LT1376 1.5A, 500kHz Step-Down Switching Regulators High Frequency, Small Inductor, High Efficiency
LTC1436/LTC1436-PLL High Efficiency, Low Noise, Synchronous Step-Down Converters 24-Pin Narrow SSOP, 3.5V ≤ V
IN
≤ 36V
LTC1438/LTC1439 Dual, Low Noise, Synchronous Step-Down Converters Multiple Output Capability, 3.5V ≤ V
IN
≤ 36V
LTC1474/LTC1475 Low Quiescent Current Step-Down DC/DC Converters Monolithic, MSOP, I
OUT
= 10µA
LTC1624 High Efficiency SO-8 N-Channel Switching Regulator Controller 8-Pin N-Channel Drive, 3.5V ≤ V
IN
≤ 36V
LTC1626 Low Voltage, High Efficiency Step-Down DC/DC Converter Monolithic, Constant Off-Time, 2.5V ≤ V
IN
≤ 6V
LTC1627/LTC1707 Low Voltage, Monolithic Synchronous Step-Down Regulator Low Supply Voltage Range: 2.65V to 8V, 0.5A
LTC1628 Dual High Efficiency 2-Phase Step-Down Controller Antiphase Drive, 3.5V ≤ V
IN
≤ 36V, Protection
LTC1772 SOT-23 Current Mode Step-Down Controller 6-Lead SOT-23, 2.5V ≤ V
IN
≤ 9.8V, 550kHz
LTC1735 High Efficiency, Low Noise Synchronous Switching Controller Burst Mode Operation, Protection, 3.5V ≤ V
IN
≤ 36V
Small Footprint 3.3V/1A Regulator
1
2
3
4
8
7
6
5
SENSE
–
I
TH
V
FB
V
IN
PDRV
GND
SYNC/
MODE
D1
RUN/
SS
L1
2.2µH
R2
0.025Ω
M1
R3
232k
V
OUT
3.3V
1A
R1
10k
C3
220pF
C1: MURATA CERAMIC GRM235Y5V106Z
C2: SANYO POSCAP 6TPA47M
D1: MOTOROLA MBRS120LT3
V
IN
3.3V TO
8.5V
R4
75k
1622 TA05
C4
560pF
C1
10µF
16V
CERAMIC
LTC1622
+
C2
47µF
6V
+
L1: COILCRAFT D01608C-222
M1: SILICONIX Si3443DY
R2: DALE WSL-2010 0.025Ω
Efficiency vs Load Current
LOAD CURRENT (mA)
1
EFFICIENCY (%)
100
90
80
70
60
50
10 100 1000
1622 TA05b
V
OUT
= 3.3V
R
SENSE
= 0.025Ω
V
IN
= 3.5V
V
IN
= 4.2V
V
IN
= 6V
Boost Converter 3.3V/2.5A
Efficiency vs Load Current With LTC1622
Configured as Boost Converter
D1
L1
4.6µH
R3
105k
R2
0.015Ω
V
IN
3.3V
V
OUT
5V
2.5A
R4
20k
1622 TA06a
C4
0.1µF
C5
150pF
C1
100µF
10V
Si6801DQ
M1
+
C6
0.1µF
1
2
3
4
8
7
6
5
SENSE
–
I
TH
V
FB
V
IN
PDRV
GND
RUN/
SS
LTC1622
SYNC/
MODE
R1
33k
C3
470pF
C1, C2: SANYO POSCAP TPB SERIES
D1: MOTOROLA MBRD835L
L1: SUMIDA CEP123-4R6
C2
220µF
10V
×2
+
M1: SILICONIX Si3442DV
R2: DALE WS-L2512 0.015Ω
LOAD CURRENT (mA)
0.001
EFFICIENCY (%)
100
90
80
70
60
50
0.01 0.1 1
1622 TA06b
V
OUT
= 5V
R
SENSE
= 0.015Ω
V
IN
= 3.3V