LTC3499/LTC3499B
16
3499fc
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
LINEAR TECHNOLOGY CORPORATION 2006
LT 0311 REV C • PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATION
PART NUMBER DESCRIPTION COMMENTS
LT1930/LT1930A 1A (I
SW
), 1.2MHz/2.2MHz, High Efficiency Step-Up
DC/DC Converter
High Efficiency, V
IN
: 2.6V to 16V, V
OUT(MAX)
= 34V, I
Q
= 4.2mA/5.5mA,
I
SD
< 1µA, ThinSOT Package
LT1961 1.5A (I
SW
), 1.25MHz, High Efficiency Step-Up
DC/DC Converter
90% Efficiency, V
IN
: 3V to 25V, V
OUT(MAX)
= 35V, I
Q
= 0.9mA,
I
SD
< 6µA, MS8E Package
LTC3400/LTC3400B 600mA (I
SW
), 1.2MHz, Synchronous Step-Up
DC/DC Converter
92% Efficiency, V
IN
: 0.5V to 5V, V
OUT(MAX)
= 5V, I
Q
= 19µA/300µA,
I
SD
< 1µA, ThinSOT Package
LTC3401 1A (I
SW
), 3MHz, Synchronous Step-Up DC/DC Converter 97% Efficiency, VIN: 0.5V to 5V, V
OUT(MAX)
= 5.5V, I
Q
= 38µA,
I
SD
< 1µA, 10-Lead MS Package
LTC3402 2A (I
SW
), 3MHz, Synchronous Step-Up DC/DC Converter 97% Efficiency, VIN: 0.5V to 5V, V
OUT(MAX)
= 5.5V, I
Q
= 38µA,
I
SD
< 1µA, 10-Lead MS Package
LTC3421 3A (I
SW
), 3MHz, Synchronous Step-Up DC/DC Converter
with Output Disconnect
95% Efficiency, V
IN
: 0.5V to 4.5V, V
OUT(MAX)
= 5.25V, I
Q
= 12µA,
I
SD
< 1µA, 24-Lead QFN Package
LTC3422 1.5A (I
SW
), 3MHz, Synchronous Step-Up DC/DC
Converter with Output Disconnect
95% Efficiency, V
IN
: 0.5V to 4.5V, V
OUT(MAX)
= 5.25V, I
Q
= 25µA,
I
SD
< 1µA
LTC3425 5A (I
SW
), 8MHz, 4-Phase Synchronous Step-Up DC/DC
Converter with Output Disconnect
95% Efficiency, V
IN
: 0.5V to 4.5V, V
OUT(MAX)
= 5.25V, I
Q
= 12µA,
I
SD
< 1µA, 32-Lead QFN Package
LTC3427 500mA (I
SW
), 1.25MHz, Synchronous Step-Up DC/DC
Converter with Soft-Start/Output Disconnect
94% Efficiency, V
IN
: 1.8V to 5V, V
OUT(MAX)
= 5.25V, I
SD
< 1µA,
DFN Package
LTC3429/LTC3429B 600mA (I
SW
), 550kHz, Synchronous Step-Up DC/DC
Converters with Soft-Start/Output Disconnect
92% Efficiency, V
IN
: 0.5V to 4.3V, V
OUT(MAX)
= 5V, I
Q
= 20µA,
I
SD
< 1µA, ThinSOT Package
LTC3458/LTC3458L 1.4A/1.7A (I
SW
), 1.5MHz, Synchronous Step-Up DC/DC
Converter with Soft-Start/Output Disconnect
93% Efficiency, V
IN
: 1.5V to 6V, V
OUT(MAX)
= 7.5V/6V, I
Q
= 15µA,
I
SD
< 1µA, DFN Package
LTC3525 400mA (I
SW
), Synchronous Step-Up DC/DC
Converter in SC70
94% Efficiency, V
IN
: 0.5V to 4.5V, V
OUT(MAX)
= 5.25V, I
Q
= 7µA,
I
SD
< 1µA, Output Disconnect
L
4.7µH
3499 F06a
LTC3499
SW
FB
GND
V
IN
V
OUT
SHDN
VC
SS
C
OUT
10µF
×5R
V
OUT
3.3V
250mA
332k
562k
0.01µF330pF
100k
C
IN
2.2µF
×5R
V
IN
2 AA CELLS
1.8V TO 3.2V
+
C
IN
: TAIYO YUDEN X5R JMK212BJ225MD
C
OUT
: TAIYO YUDEN X5R JMK212BJ106MD
L: COILCRAFT MSS5131-472MB
OFFON
Two Cells to 3.3V, 250mA Two Cells to 5V Efficiency
LOAD CURRENT (mA)
0.1
40
EFFICIENCY (%)
POWER LOSS (mW)
50
60
70
80
90
100
0.1
1
10
100
1000
10000
100000
1 10 100 1000
3499 F06b
V
IN
= 3V
V
IN
= 2.4V
V
IN
= 1.8V
POWER LOSS
EFFICIENCY
