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Linear Technology Electronic Components Datasheet

LTC3520 Datasheet

Synchronous 1A Buck-Boost and 600mA Buck Converters

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FEATURES
Dual High Efficiency DC/DC Converters:
Buck-Boost (VOUT: 2.2V to 5.25V, IOUT = 1A at
VOUT = 3.3V, VIN ≥ 3V)
Buck (VOUT: 0.8V to VIN, IOUT = 600mA)
2.2V to 5.5V Input Voltage Range
Pin-Selectable Burst Mode® Operation
www.DaUtnacShoememt4Uit.cteodmGain 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.
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.
TYPICAL APPLICATION
3.3V at 500mA, 1.8V at 600mA and 1.5V at 200mA Converter
VIN
2.2V TO
5.5V
VOUT2
1.8V
600mA
10µF
22µF
255k
200k
BURST
4.7µH
PVIN1 PVIN2 PVIN3 SVIN SW1A
SW1B
SW2
VOUT1
4.7µH
470pF
27pF
FB2
0.01µF
SS2
54.9k
RT
LTC3520
VC1
15k
FB1
0.01µF
SS1
VOUT2
PWM
PWM1
PWM2
AOUT
SD3
OFF ON
SD2
SD1 AIN
PGND1 SGND PGND2
56pF
10k
1M
309k
100k
33pF
110k
47µF
VOUT1
3.3V
500mA
1A FOR
VIN 3V
VOUT
1.5V
200mA
4.7µF
3520 TA01
Efficiency vs VIN
100
BUCK-BOOST
95 IOUT = 150mA
BUCK
90 IOUT = 250mA
85
80
75
70
2.2 2.7 3.2 3.7 4.2 4.7 5.2
VIN (V)
3520f
1


Linear Technology Electronic Components Datasheet

LTC3520 Datasheet

Synchronous 1A Buck-Boost and 600mA Buck Converters

No Preview Available !

LTC3520
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PVIN1, PVIN2, PVIN3, SVIN Voltage................ –0.3V to 6V
SW1A, SW1B, SW2 Voltage
DC............................................................ –0.3V to 6V
Pulsed <100ns…………….…………....... –1V to 7V
Voltage, All Other Pins ................................. –0.3V to 6V
Operating Temperature Range (Note 2) ...–40°C to 85°C
Maximum Junction Temperature (Note 5) ............ 125°C
Storage Temperature Range...................–65°C to 150°C
www.DataSheet4U.com
PIN CONFIGURATION
TOP VIEW
24 23 22 21 20 19
SVIN 1
AOUT 2
AIN 3
RT 4
PWM1 5
SD1 6
18 FB1
17 SS1
16 SGND
25
15 VC1
14 FB2
13 SS2
7 8 9 10 11 12
UF PACKAGE
24-LEAD (4mm × 4mm) PLASTIC QFN
TJMAX = 125°C, θJA = 37°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3520EUF#PBF
LTC3520EUF#TRPBF
3520
24-Lead (4mm × 4mm) Plastic QFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
–40°C to 85°C
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C, SVIN = PVIN1 = PVIN2 = PVIN3 = 3.6V, VOUT1 = 3.3V, RT = 54.9k, unless
otherwise noted.
PARAMETER
Input Voltage
CONDITIONS
MIN TYP MAX UNITS
2.2
5.5 V
Quiescent Current in Shutdown
Undervoltage Lockout
Burst Mode Quiescent Current, Both Converters
Oscillator Frequency
Buck Converter
VSD1 = VSD2 = VSD3 = 0V
SVIN Rising
VFB1 = VFB2 = 0.88V, VSD3 = 0V
RT = 54.9k
0.01 1
2 2.2
55
0.8 1 1.2
µA
V
µA
MHz
PMOS Switch Resistance
0.32 Ω
NMOS Switch Resistance
0.18 Ω
NMOS Switch Leakage
PMOS Switch Leakage
VSW2 = 5V, SVIN = PVIN1 = PVIN2 = PVIN3 = 5V
VSW2 = 0V, SVIN = PVIN1 = PVIN2 = PVIN3 = 5V
0.1 5
0.1 10
µA
µA
3520f
2


Part Number LTC3520
Description Synchronous 1A Buck-Boost and 600mA Buck Converters
Maker Linear Technology
Total Page 24 Pages
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