LT1302 Datasheet, PDF (1/16 Pages) Linear Technology – Micropower High Output Current Step-Up Adjustable and Fixed 5V DC/DC Converters

FEATURES
s _{5V at 600mA or 12V at 120mA from 2-Cell Supply}
s _{200µA Quiescent Current}
s _{Logic Controlled Shutdown to 15µA}
s _{Low VCESAT Switch: 310mV at 2A Typical}
s _{Burst Mode}^TM _{Operation at Light Load}
s _{Current Mode Operation for Excellent}
Line and Load Transient Response
s _{Available in 8-Lead SO or PDIP}
s _{Operates with Supply Voltage as Low as 2V}
APPLICATI S
s _{Notebook and Palmtop Computers}
s _{Portable Instruments}
s _{Personal Digital Assistants}
s _{Cellular Telephones}
s _{Flash Memory}
LT1302/LT1302-5
Micropower
High Output Current
Step-Up Adjustable and
Fixed 5V DC/DC Converters
DESCRIPTIO
The LT^®1302/LT1302-5 are micropower step-up DC/DC
converters that maintain high efficiency over a wide
range of output current. They operate from a supply
voltage as low as 2V and feature automatic shifting
between Burst Mode operation at light load, and current
mode operation at heavy load.
The internal low loss NPN power switch can handle
current in excess of 2A and switch at frequencies up to
400kHz. Quiescent current is just 200µA and can be
further reduced to 15µA in shutdown.
Available in 8-pin PDIP or 8-pin SO packaging, the LT1302/
LT1302-5 have the highest switch current rating of any
similarly packaged switching regulators presently on the
market.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
TYPICAL APPLICATI
2 CELLS
L1
10µH
C1
100µF
C3
0.1µF
D1
C2
100µF
NC
6
5
7
V_IN
SW
I_{T 3}
SHDN SHUTDOWN
LT1302-5
8 _{PGND SENSE} 4
GND
V_C
1
2
R_C
20k
C_C
0.01µF
OUTPUT
5V
600mA
C1 = C2 = SANYO OS-CON
L1 = COILTRONICS CTX10-3
COILCRAFT DO3316-103
LT1302 • F01
D1 = MOTOROLA MBRS130LT3
Figure 1. 2-Cell to 5V/600mA DC/DC Converter
2-Cell to 5V Converter Efficiency
90
88
86
V_IN = 3V
84
V_IN = 2.5V
82
80
V_IN = 2V
78
76
74
72
70
1
10
100
LOAD CURRENT (mA)
1000
LT1302 • TA02
1