LTC3527-1_15 Datasheet, PDF (19/22 Pages) Linear Technology – Dual 800mA/400mA, 1.2MHz/2.2MHz Synchronous Step-Up DC/DC Converters

LTC3527/LTC3527-1
TYPICAL APPLICATIONS
Sequenced Start-Up V_OUT1 to V_OUT2
1.2MHz, 1-Cell to V_OUT1 = 1.8V, V_OUT2 = 3.3V
0.85V TO 1.60V
+ SINGLE
ALKALINE
CELL
C_IN
4.7μF _4.7μH
V_IN1 V_IN V_IN2
V_OUT
1.8V
200mA
C_OUT1
4.7μF
612k
ON
OFF
1.21M
SW1
SW2
V_OUT1
15pF
FB1
LTC3527
V_OUT2
FB2
PGOOD1
SHDN1
PGOOD2
SHDN2
MODE GND FSEL
4.7μH
15pF ^1.78M
V_OUT
3.3V
150mA
1M
C_OUT2
4.7μF
L: SUMIDA CDRH3D164R7
C_IN, C_OUT: TAIYO YUDEN X5R JMK212BJ475MD
35271 TA06
100
90
80
70
60
50
40
30
20
0.01
Boost 1 Efficiency
1.2V _1.5V
BURST
1V
FIXED
1V
1.2V
1.5V
0.1
1
10 100 1000
LOAD CURRENT (mA)
35271 TA06b
Boost 2 Efficiency
100
90
1.2V
1.5V
BURST
80
1V
70
1.5V
1.2V
1V
60
50
FIXED
40
30
20
0.01
0.1
1
10 100 1000
LOAD CURRENT (mA)
35271 TA06c
35271fc
19