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| LTC3115-2_15 Datasheet, PDF (37/42 Pages) Linear Technology – 40V, 2A Synchronous Buck-Boost DC/DC Converter | |||
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LTC3115-2
Typical Applications
USB, FireWire, Automotive and Unregulated Wall Adapter to Regulated 5V (750kHz)
USB
4.1V TO 5.5V
FireWire
8V TO 36V
AUTOMOTIVE
3.6V TO 40V
WALL ADAPTER
4V TO 40V
D1
D2
D3
D4
+
CBST1
0.1µF
L1
10µH
CBST2
0.1µF
100µF
ELECT
2.2µF
BURST PWM
OFF ON
RT
47.5k
BST1 SW1
SW2 BST2
PVIN
VIN
PVOUT
LTC3115-2
PWM/SYNC
RUN
RT
GND
PGND
VC
FB
PVCC
VCC
CO
47µF
Ã2
RFB
CFB
4700pF
100k
RTOP
1M
C1
4.7µF
31152 TA06a
RBOT
249k
5V
600mA
CFF
47pF
RFF
51k
CIN: MURATA GRM55DR61H106K
CO: GRM43ER60J476
D1-D4: B360A-13-F
L1: COILCRAFT LPS6225
Hot Plug on Firewire Input
from VIN = 4V to 24V
Soft-Start Waveform,
VIN = 24V, ILOAD = 0.5A
~24V
VIN at IC
(10V/DIV)
~4V
VOUT
(200mV/DIV)
500µs/DIV
31152 TA06e
VRUN
(5V/DIV)
VCC
(5V/DIV)
VOUT
(2V/DIV)
INDUCTOR
CURRENT
(500mA/DIV)
2ms/DIV
31152 TA06c
Efficiency vs Load Current,
from Automotive Input
100
Output Voltage Transient Response,
600mA Load Step, Powered from Automotive Input
90
80
70
60
50
40
30
20
0.01
VIN = 3.6V
VIN = 5V
VIN = 12V
VIN = 24V
VIN = 36V
0.1
LOAD CURRENT (A)
1
31152 TA06b
VOUT
(200mV/DIV)
VOUT
(200mV/DIV)
VOUT
(200mV/DIV)
For more information www.linear.com/LTC3115-2
VIN = 36V
VIN = 12V
VIN = 3.6V
1ms/DIV
31152 TA06d
31152fa
37
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