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LTC3115-2_15 Datasheet, PDF (38/42 Pages) Linear Technology – 40V, 2A Synchronous Buck-Boost DC/DC Converter
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LTC3115-2
Typical Applications
1.5MHz, 12V Regulator with 8V to 40V Input Voltage Range
CBST1
0.1µF
L1
4.7µH
CBST2
0.1µF
8V TO 40V
CI
4.7µF
BST1 SW1
PVIN
VIN
RUN
SW2 BST2
PVOUT
LTC3115-2
BURST PWM
PWM/SYNC
VC
RT
RT
23.7k
GND
PGND
FB
PVCC
VCC
CO
22µF
RFB
CFB
1000pF
15k
RTOP
1M
C1
4.7µF
RBOT
90.9k
12V AT 500mA
1A VIN > 10V
CFF
33pF
RFF
15k
CO: TDK C3225X7R1C226k
L1: COILCRAFT MOS6020-472MX
31152 TA07a
Load Step Transient Response,
0mA to 500mA, VIN = 8V
Load Step Transient Response,
0mA to 500mA, VIN = 24V
LOAD CURRENT
(500mA/DIV)
LOAD CURRENT
(500mA/DIV)
VOUT
(500mV/DIV)
INDUCTOR
CURRENT
(1A/DIV)
200µs/DIV
31152 TA07b
VOUT
(500mV/DIV)
INDUCTOR
CURRENT
(1A/DIV)
200µs/DIV
31152 TA07c
38
Efficiency vs Load Current,
PWM Mode
100
90
80
70
60
50
40
30
20
0.01
VIN = 6V
VIN = 10V
VIN = 24V
VIN = 36V
0.1
LOAD CURRENT (A)
1
31152 TA07d
Efficiency vs Load Current,
Burst Mode Operation
90
80
70
60
50
40
30
20
0.1
VIN = 6V
VIN = 10V
VIN = 24V
VIN = 36V
1
10
100
LOAD CURRENT (mA)
31152 TA07e
31152fa
For more information www.linear.com/LTC3115-2
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