ltc1622 Linear Technology Corporation, ltc1622 Datasheet - Page 16

• Manufacturer Part Number: ltc1622
• Description: Low Input Voltage Current Mode Step-down Dc/dc Controller
• Manufacturer: Linear Technology Corporation

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