LT1948
BLOCK DIAGRA
W
V
IN
GND
V
IN
FB1
–
–
+
+
REF
R
OSC
S
Q
SW1
Q1
∑
+
+
0.01Ω
SLOPE 1
8µA
28mV
–+
C
T
Q4
REF
REF
1.26V REFERENCE
AND
UNDERVOLTAGE
LOCKOUT
V
ON
3MHz
OSCILLATOR
Q3
REF
VO2
OSC
SLOPE 1
SLOPE 2
–
–
+
+
REF
R
OSC
S
Q
SW2
Q2
∑
+
+
0.03Ω
SLOPE 2
1948BD
RELATED PARTS
PART NUMBER
LT1949
LT1317
LT1308B
LT1615
LT1930
DESCRIPTION
600kHz, 1A Switch PWM DC/DC Converter
2-Cell Micropower DC/DC with Low-Battery Detect
600kHz Single Cell Step-Up Regulator
Micropower Step-Up Regulator in SOT-23
1.2MHz, Step-Up Regulator in SOT-23
COMMENTS
10V at 175mA from 3.3V Input
3.3V at 200mA from 2-Cell Input
5V at 1A from a 1-Cell Li-Ion Battery
20V at 12mA from 2.5V Input, 5-Lead SOT-23 Package
5V at 480mA from 3.3V, 5-Lead SOT-23 Package
1948i LT/TP 0800 4K • PRINTED IN USA
4
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900
q
FAX: (408) 434-0507
q
www.linear-tech.com
©
LINEAR TECHNOLOGY CORPORATION 2000
LINEAR [ LINEAR INTEGRATED SYSTEMS ]
