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LTC3520IUF Datasheet

Synchronous 1A Buck-Boost and 600mA Buck Converters

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LTC3520
Synchronous 1A
Buck-Boost and 600mA
Buck Converters
FEATURES
n 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)
n 2.2V to 5.5V Input Voltage Range
n Pin-Selectable Burst Mode® Operation
n Uncommitted Gain Block for LDO Controller, Battery
Good Indication or Sequencing
n Programmable 100kHz to 2MHz Switching Frequency
n 55μA Total Quiescent Current for Both Converters in
Burst Mode Operation
n Thermal and Overcurrent Protection
n <1μA Quiescent Current in Shutdown
n 24-Lead 4mm × 4mm QFN Package
APPLICATIONS
n Portable Media Players
n Digital Cameras
n Handheld PCs, PDAs
n GPS Receivers
L, LT, LTC, LTM, Linear Technology, the Linear logo 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.
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
27pF
0.01μF
54.9k
PWM
PVIN1 PVIN2 PVIN3 SVIN SW1A
SW1B
SW2
VOUT1
VC1
FB2
SS2
FB1
LTC3520
SS1
RT
PWM1
PWM2
AOUT
4.7μH
470pF
15k
0.01μF
VOUT2
SD3
OFF ON
SD2
SD1
AIN
PGND1 SGND PGND2
56pF
1M
10k
309k
33pF
100k
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)
3520 TA01b
3520fa
1


Linear Technology Electronic Components Datasheet

LTC3520IUF 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 Junction Temperature Range
(Note 2).................................................. –40°C to 125°C
Maximum Junction Temperature (Note 5) ............ 125°C
Storage Temperature Range .................. –65°C to 150°C
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 s 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
TEMPERATURE RANGE
LTC3520EUF#PBF
LTC3520EUF#TRPBF
3520
24-Lead (4mm × 4mm) Plastic QFN –40°C to 85°C
LTC3520IUF#PBF
LTC3520IUF#TRPBF
3520
24-Lead (4mm × 4mm) Plastic QFN –40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
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/
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction 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
CONDITIONS
MIN TYP MAX UNITS
Input Voltage
l 2.2
5.5
V
Quiescent Current in Shutdown
VSD1 = VSD2 = VSD3 = 0V
LTC3520E
LTC3520I
l
0.01
1
μA
l
0.5
4
μA
Undervoltage Lockout
Burst Mode Quiescent Current, Both Converters
Oscillator Frequency
Buck Converter
SVIN Rising
VFB1 = VFB2 = 0.88V, VSD3 = 0V
RT = 54.9k
2
2.2
V
55
μA
l 0.8
1
1.2
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
μA
0.1
10
μA
3520fa
2


Part Number LTC3520IUF
Description Synchronous 1A Buck-Boost and 600mA Buck Converters
Maker Linear
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