31151 Просмотр технического описания (PDF) - Linear Technology
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31151 Datasheet PDF : 42 Pages
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Features
n Wide VIN Range: 2.7V to 40V
n Wide VOUT Range: 2.7V to 40V
n 1A Output Current for VIN ≥ 3.6V, VOUT = 5V
n 2A Output Current in Step-Down Operation
for VIN ≥ 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
Applications
n 24V/28V Industrial Applications
n Automotive Power Systems
n Telecom, Servers and Networking Equipment
n FireWire Regulator
n Multiple Power Source Supplies
LTC3115-1
40V, 2A Synchronous
Buck-Boost DC/DC
Converter
Description
The LTC®3115-1 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 proprietary
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 provides
low noise, high efficiency operation and the ability to syn-
chronize switching to an external clock. Switching frequen-
cies up to 2MHz are supported to allow use of small value in-
ductors for miniaturization of the application circuit. Pin se-
lectable Burst Mode operation reduces standby current and
improves light load efficiency which, combined with a 3µA
shutdown current, make the LTC3115-1 ideally suited for
battery-powered applications. Additional features include
output disconnect in shutdown, short-circuit protection
and internal soft-start. The LTC3115-1 is available in ther-
mally enhanced 16-lead 4mm × 5mm × 0.75mm DFN and
20‑lead TSSOP packages.
L, LT, LTC, LTM, Burst Mode, LTspice, Linear Technology and the Linear logo are registered
trademarks and No RSENSE is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents including
6404251, 6166527 and others pending.
Typical Application
10µH
0.1µF
0.1µF
2.7V TO
40V
4.7µF
BURST PWM
OFF ON
47.5k
BST1 SW1
SW2 BST2
PVIN
PVOUT
VIN
LTC3115-1
PWM/SYNC
RUN
RT
GND
PGND
VC
FB
PVCC
VCC
47µF
3300pF
60.4k
4.7µF
5V
1A VIN > 3.6V
2A VIN ≥ 6V
1M
33pF
15k
249k
(OPTIONAL)
3115 TA01a
For more information www.linear.com/LTC3115-1
Efficiency vs VIN
95
ILOAD = 0.5A
90
ILOAD = 1A
85
80
75
70
2
VOUT = 5V
10
40
INPUT VOLTAGE (V)
31151 TA01b
31151fb
1
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