LTC3115-1
1
Rev. C
TYPICAL APPLICATION
FEATURES
DESCRIPTION
40V, 2A Synchronous
Buck-Boost DC/DC
Converter
is a high voltage monolithic synchronous
buck-boost DC/DC converter. Its wide 2.7V to 40V input
and output voltage ranges make it well suited to a wide
variety of automotive and industrial applications. A propri-
etary low noise switching algorithm optimizes efficiency
with input voltages that are above, below or even equal
to the output voltage and ensures seamless transitions
between operational modes.
Programmable frequency PWM mode operation pro-
vides low noise, high efficiency operation and the ability
to synchronize switching to an external clock. Switching
frequencies up to 2MHz are supported to allow use of
small value inductors for miniaturization of the appli-
cation circuit. Pin selectable Burst Mode operation
reduces standby current and improves light load effi-
ciency which, combined with a 3µA shutdown current,
make the LTC3115-1 ideally suited for battery-powered
applications. Additional features include output discon-
nect in shutdown, short-circuit protection and inter-
nal soft-start. The LTC3115-1 is available in thermally
enhanced 16-lead 4mm
×
5mm
×
0.75mm DFN and
20-lead TSSOP packages.
Efficiency vs V
IN
APPLICATIONS
n
Wide V
IN
Range: 2.7V to 40V
n
Wide V
OUT
Range: 2.7V to 40V
n
1A Output Current for V
IN
≥ 3.6V, V
OUT
= 5V
n
2A Output Current in Step-Down Operation
for V
IN
≥ 6V
n
Programmable Frequency: 100kHz to 2MHz
n
Synchronizable Up to 2MHz with an External Clock
n
Up to 95% Efficiency
n
30µA No-Load Quiescent Current in Burst Mode
®
Operation
n
Ultralow Noise Buck-Boost PWM
n
Internal Soft-Start
n
3µA Supply Current in Shutdown
n
Programmable Input Undervoltage Lockout
n
Small 4mm
×
5mm
×
0.75mm DFN Package
n
Thermally Enhanced 20-Lead TSSOP Package
n
AEC-Q100 Qualified for Automotive Applications
n
24V/28V Industrial Applications
n
Automotive Power Systems
n
Telecom, Servers and Networking Equipment
n
FireWire Regulator
n
Multiple Power Source Supplies
BST1
BST2
PV
IN
V
IN
VC
PV
OUT
PWM/SYNC
FB
RUN
PV
CC
V
CC
RT
SW1
SW2
GND
PGND
LTC3115-1
10µH
0.1µF
BURST PWM
2.7V TO
40V
0.1µF
33pF
(OPTIONAL)
5V
1A V
IN
> 3.6V
2A V
IN
≥ 6V
4.7µF
47µF
1M
249k
4.7µF
3115 TA01a
47.5k
15k
60.4k
3300pF
OFF ON
INPUT VOLTAGE (V)
EFFICIENCY (%)
95
90
85
31151 TA01b
70
80
75
40
2
10
I
LOAD
= 0.5A
I
LOAD
= 1A
V
OUT
= 5V
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by U.S. Patents including 6404251, 6166527 and others pending.
