LTC3523-2_15 Datasheet, PDF (14/16 Pages) Linear Technology – Synchronous 600mA Step-Up and 400mA Step-Down DC/DC Converters

LTC3523/LTC3523-2
TYPICAL APPLICATIONS
Li-Ion to 5V/150mA, 2.5V/200mA
V_IN
2.5V TO 4.2V
+
Li-Ion
V_OUT1
STEP-UP
OUTPUT
5V
150mA
10μF
4.7μF
10μH
V_IN1 V_IN2 V_BAT
SW1
SW2
4.7μH
768k
V_{OUT LTC3523}
FB2
FB1
MODE V_IN
PGOOD1
PGOOD2
243k
SHDN1
SHDN2
GND1 GND2 GND3
10pF 768k
243k
OFF ON
OFF ON 3523 TA03
10μF
V_OUT2
STEP-DOWN
OUTPUT
2.5V
200mA
100
90
80
70
60
50
40
30
20
10
0
0
Efficiency and Power Loss
vs Load Current
EFFICIENCY
1000
100
P0WER
LOSS
10
V_IN = 3.6V
V_OUT1 = 5V
V_OUT2 = 2.5V ₁
f_OSC = 1.2MHz
STEP-UP
STEP-DOWN
0
1
10
100
1000
LOAD CURRENT (mA)
3523 TA03b
3523fb
14