Datasheet

7
LT1944
TYPICAL APPLICATIO S
U
V
IN
SW1
FB2
LT1944
4
3
L1
4.7µH
D1
SHDN2
324k
1M
C2
10µF
5V
40mA
3.3V
80mA
V
IN
1.8V
TO 3V
C1: TAIYO YUDEN JMK212BJ475
C2, C3: TAIYO YUDEN JMK316BJ106
D1, D2: ON SEMI MBR0520
L1, L2: MURATA LQH3C4R7
[phone]
[phone]
[phone]
[phone]
1944 TA02
GND
7
PGND
9
PGND
6
810
SW2
4.7pF
C1
4.7µF
FB1
2
5
1
SHDN1
L2
4.7µH
D2
1M
604k
4.7pF
C3
10µF
2-Cell Dual Output (3.3V, 5V) Boost Converter
LOAD CURRENT (mA)
0.1
EFFICIENCY (%)
110100
1944 TA02a
90
85
80
75
70
65
60
55
50
V
IN
= 3V
V
IN
= 1.8V
LOAD CURRENT (mA)
0.1
EFFICIENCY (%)
1 10 100
1944 TA02b
90
85
80
75
70
65
60
55
50
V
IN
= 3V
V
IN
= 1.8V
2-Cell to 5V Efficiency 2-Cell to 3.3V Efficiency
PACKAGE DESCRIPTIO
U
MS10 Package
10-Lead Plastic MSOP
(LTC DWG # 05-08-1661)
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
MSOP (MS10) 1100
* DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH,
PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
0.021
± 0.006
(0.53 ± 0.015)
0
° – 6° TYP
SEATING
PLANE
0.007
(0.18)
0.043
(1.10)
MAX
0.007 – 0.011
(0.17 – 0.27)
0.005
± 0.002
(0.13 ± 0.05)
0.034
(0.86)
REF
0.0197
(0.50)
BSC
12
3
45
0.193 ± 0.006
(4.90 ± 0.15)
8910
7
6
0.118 ± 0.004*
(3.00 ± 0.102)
0.118 ± 0.004**
(3.00 ± 0.102)