LTC3118_15 Datasheet, PDF (33/38 Pages) Linear Technology – 18V, 2A Buck-Boost DC/DC Converter with Low-Loss Dual Input PowerPath

LTC3118
Typical Applications
System Power (Priority) or 3-Cell Li-Ion to 5V V_OUT Regulator with Automatic Burst Mode Operation
3.3µH
4V TO 5.5V
+
SYSTEM
POWER
0.1µF
232k
22µF
100k
V_IN1 BST1 SW1
RUN1
PGND
0.1µF
SW2 BST2 V_OUT
FB
GND
47nF
47nF
7.5V TO 12.6V
+
+
Li-Ion
+
CM1
CM2
CP1
CP2
10nF
10nF
CN2
CN1
523k
22µF
100k
V_IN2
RUN2
PGND
LTC3118
VC
V1GD
V2GD
PGD
V_CC
SEL
MODE
3118 TA02a
402k
100µF
PGND
100k
22pF
40.2k
1.8nF
POWER GOOD
INDICATORS
5V UP TO 1.5A,
V_IN > 4.5V
4.7µF
BAT-54
SCHOTTKY DIODE
Efficiency vs Load Current: V_IN1 = 5V,
V_IN2 = 10.8V, V_OUT = 5V
100
90 ^BURST
80
70
60
PWM
50
40
30
20
10
0
0.0001 0.001 0.01 0.1
V_IN1
V_IN2
1
10
LOAD CURRENT (A)
3118 TA02b
5V_OUT
TRANSIENT
200mV/DIV
INDUCTOR
CURRENT
1A/DIV
LOAD
CURRENT
1A/DIV
VC
200mV/DIV
100mA to 1A Load Step, V_IN1 = 5V,
V_OUT = 5V, Auto Burst Mode
100µs/DIV
3118 TA02c
For more information www.linear.com/LTC3118
3118f
33