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LTC3520EUF-TRPBF

Description
Synchronous 1A Buck-Boost and 600mA Buck Converters
File Size360KB,24 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC3520EUF-TRPBF Overview

Synchronous 1A Buck-Boost and 600mA Buck Converters

FEATURES
LTC3520
Synchronous 1A
Buck-Boost and 600mA
Buck Converters
DESCRIPTION
The LTC
®
3520 combines 1A buck-boost and 600mA
synchronous buck DC/DC converters in a tiny 4mm
×
4mm package. A programmable switching frequency
allows the efficiency to be optimized while minimizing
the solution footprint. Both converters feature soft-start
and current limit protection. The uncommitted gain block
can be configured as an LDO or utilized as a battery-good
comparator.
The buck converter is current mode controlled with internal
synchronous rectification to improve efficiency. Pin-select-
able Burst Mode operation can be enabled to improve light
load efficiency, or the buck converter can be operated in
low noise PWM mode for sensitive applications.
The buck-boost converter provides continuous conduc-
tion operation to maximize efficiency and minimize noise.
At light loads, use of Burst Mode operation will improve
efficiency.
The LTC3520 provides a <1µA shutdown mode and over-
temperature shutdown on both converters. The LTC3520
is available in a low profile (0.75mm) 24-lead 4mm
×
4mm QFN package.
Dual High Efficiency DC/DC Converters:
Buck-Boost (V
OUT
: 2.2V to 5.25V, I
OUT
= 1A at
V
OUT
= 3.3V, V
IN
≥ 3V)
Buck (V
OUT
: 0.8V to V
IN
, I
OUT
= 600mA)
2.2V to 5.5V Input Voltage Range
Pin-Selectable Burst Mode
®
Operation
Uncommitted Gain Block for LDO Controller,
Battery Good Indication or Sequencing
Programmable 100kHz to 2MHz Switching Frequency
55µA Total Quiescent Current for Both Converters in
Burst Mode Operation
Thermal and Overcurrent Protection
<1µA Quiescent Current in Shutdown
24-Lead 4mm
×
4mm QFN Package
APPLICATIONS
Portable Media Players
Digital Cameras
Handheld PCs, PDAs
GPS Receivers
, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology
Corporation. All other trademarks are the property of their respective owners. Protected by
U.S. Patents, including 5481178, 6166527, 6304066, 6404251, 6580258.
TYPICAL APPLICATION
3.3V at 500mA, 1.8V at 600mA and 1.5V at 200mA Converter
V
IN
2.2V TO
5.5V
V
OUT2
1.8V
600mA
22µF
4.7µH
255k
PV
IN1
PV
IN2
PV
IN3
SV
IN
SW1A
SW1B
V
OUT1
SW2
V
C1
FB2
200k
0.01µF
SS2
54.9k
R
T
PWM1
BURST
PWM
PWM2
SD3
OFF ON
SD2
SD1
PGND1 SGND PGND2
A
IN
110k
3520 TA01
Efficiency vs V
IN
100
V
OUT1
3.3V
500mA
1A FOR
V
IN
3V
4.7µH
95
EFFICIENCY (%)
90
85
80
75
70
2.2
BUCK-BOOST
I
OUT
= 150mA
BUCK
I
OUT
= 250mA
470pF
56pF
1M
15k
10k
47µF
10µF
27pF
FB1
0.01µF
LTC3520
SS1
V
OUT2
A
OUT
V
OUT
1.5V
200mA
4.7µF
309k
33pF
100k
2.7
3.2
4.2
3.7
V
IN
(V)
4.7
5.2
3520f
1

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