LT1610
1.7MHz, Single Cell
Micropower
DC/DC Converter
FEATURES
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DESCRIPTIO
Uses Tiny Capacitors and Inductor
Internally Compensated
Low Quiescent Current: 30
µ
A
Operates with V
IN
as Low as 1V
3V at 30mA from a Single Cell
5V at 200mA from 3.3V
High Output Voltage Capability: Up to 28V
Low Shutdown Current: < 1µA
Automatic Burst Mode
TM
Switching at Light Load
Low V
CESAT
Switch: 300mV at 300mA
8-Lead MSOP and SO Packages
The LT
®
1610 is a micropower fixed frequency DC/DC
converter that operates from an input voltage as low as 1V.
Intended for small, low power applications, it switches at
1.7MHz, allowing the use of tiny capacitors and inductors.
The device can generate 3V at 30mA from a single cell
(1V) supply. An internal compensation network can be
connected to the LT1610’s V
C
pin, eliminating two exter-
nal components. No-load quiescent current of the LT1610
is 30µA, and the internal NPN power switch handles a
300mA current with a voltage drop of 300mV.
The LT1610 is available in 8-lead MSOP and SO packages.
APPLICATIO S
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Pagers
Cordless Phones
Battery Backup
LCD Bias
Portable Electronic Equipment
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
L1
4.7µH
D1
V
OUT
3V
30mA
R1
1M
85
V
OUT
= 3V
80
V
IN
= 1.25V
75
V
IN
= 1.5V
6
V
IN
3
5
SW
FB
LT1610
2
+
1 CELL
C1
22µF
8
R2
681k
GND
7
+
C2
22µF
EFFICIENCY (%)
SHDN
70
65
60
55
COMP
V
C
1
PGND
4
C1, C2: AVX TAJA226M006R
D1: MOTOROLA MBR0520
L1: MURATA LQH1C4R7
1610 F01
50
0.1
1
10
LOAD CURRENT (mA)
100
1610 TA01
Figure 1. 1-Cell to 3V Step-Up Converter
U
Efficiency
V
IN
= 1V
U
U
1
LINER [ LINEAR TECHNOLOGY ]
