16
LT1610
1610f LT/TP 0699 4K • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1998
TYPICAL APPLICATIONS N
U
Li-Ion to 3.3V SEPIC DC/DC Converter
PART NUMBER DESCRIPTION COMMENTS
LTC
®
1474 Micropower Step-Down DC/DC Converter 94% Efficiency, 10µA I
Q
, 9V to 5V at 250mA
LT1307 Single Cell Micropower 600kHz PWM DC/DC Converter 3.3V at 75mA from 1 Cell, MSOP Package
LTC1440/1/2 Ultralow Power Single/Dual Comparators with Reference 2.8µA I
Q
, Adjustable Hysteresis
LTC1502-3.3 Single Cell to 3.3V Regulated Charge Pump 40µA I
Q
, No Inductors, 3.3V at 10mA from 1V Input
LT1521 Micropower Low Dropout Linear Regulator 500mV Dropout, 300mA Current, 12µA I
Q
LT1611 Inverting 1.4MHz DC/DC Converter 5V to –5V at 150mA, Tiny SOT-23 Package
LT1613 Step-Up 1.4MHz DC/DC Converter 3.3V to 5V at 200mA, Tiny SOT-23 Package
LTC1682 Doubler Charge Pump with Low Noise Linear Regulator Fixed 3.3V and 5V Outputs, 1.8V to 4.4V Input Range, 50mA Output
RELATED PARTS
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear-tech.com
SHUTDOWN
C2
22µF
6.3V
C1
22µF
6.3V
L1
22µH
L2
22µH
C3
1µF
CERAMIC
D1
INPUT
Li-ION
3V to 4.2V
V
OUT
3.3V
120mA
1610 TA14
+
+
1M
604k
C1, C2: AVX TAJB226M006
C3: AVX 1206YC105 (X7R)
D1: MOTOROLA MBR0520
L1, L2: MURATA LQH3C220 (UNCOUPLED)
OR SUMIDA CLS62-220 (COUPLED)
65
•
•
2
3
4
7
8
1
V
IN
SW
PGND
FB
SHDN
GND
COMP
LT1610
V
C
Efficiency
LOAD CURRENT (mA)
0.1
EFFICIENCY (%)
60
70
80
1 10 100
1610 TA15
50
40
30
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
SHUTDOWN
C2
22µF
6.3V
C1
22µF
6.3V
L1
22µH
L2
22µH
C3
1µF
CERAMIC
D1
V
OUT
5V
120mA
1610 TA16
+
+
1M
324k
C1, C2: AVX TAJB226M006
C3: AVX 1206YC105 (X7R)
D1: MOTOROLA MBR0520
L1, L2: MURATA LQH3C220 (UNCOUPLED)
OR SUMIDA CLS62-220 (COUPLED)
65
•
•
2
3
4
7
8
1
V
IN
SW
PGND
FB
SHDN
GND
COMP
LT1610
V
C
4 CELLS
4-Cell to 5V/120mA SEPIC DC/DC Converter
LOAD CURRENT (mA)
0.1
EFFICIENCY (%)
60
70
80
1 10 100
1610 TA17
50
40
30
V
IN
= 3.6V
V
IN
= 4.2V
V
IN
= 5V
V
IN
= 6.5V
4-Cell to 5V Efficiency
