DC/DC Converter. LTC3532 Datasheet

LTC3532 Converter. Datasheet pdf. Equivalent

Part LTC3532
Description Micropower Synchronous Buck-Boost DC/DC Converter
Feature www.DataSheet4U.com FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ LTC3532 Micropower Synchronous Buck-Boost DC/DC.
Manufacture Linear Technology
Datasheet
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LTC3532
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LTC3532
Micropower Synchronous
Buck-Boost DC/DC Converter
FEATURES
DESCRIPTIO
Single Inductor
Regulated Output with Input Voltages Above, Below
or Equal to the Output
Wide VIN Range: 2.4V to 5.5V
VOUT Range: 2.4V to 5.25V
Up to 500mA Peak Output Current
Synchronous Rectification: Up to 95% Efficiency
Manual or Programmable Automatic Burst Mode®
Operation
Output Disconnect in Shutdown
Programmable Oscillator: 300kHz to 2MHz
Pin Compatible with LTC3440
Small Thermally Enhanced 10-Lead (3mm × 3mm)
DFN and 10-Lead MSOP Packages
U
APPLICATIO S
Miniature Hard Disk Drive Power Supply
MP3 Players
Handheld Instruments
Digital Cameras
Handheld Terminals
The LTC®3532 is a high efficiency, fixed frequency, buck-
boost DC/DC converter that operates from input voltages
above, below or equal to the output voltage. The topology
incorporated in the IC provides a continuous transfer
function through all operating modes, making the product
ideal for single lithium-ion, multicell alkaline or NiMH ap-
plications where the output voltage is within the battery
voltage range.
The device includes two 0.36Ω N-channel MOSFET
switches and two 0.42Ω P-channel switches. Switching
frequencies up to 2MHz are programmed with an external
resistor. Quiescent current is only 35μA in Burst Mode
operation, maximizing battery life in portable applica-
tions. Automatic Burst Mode operation allows the user
to program the load current for Burst Mode operation or
to control it manually.
Other features include a 1μA shutdown, soft-start control,
thermal shutdown, and peak current limit. The LTC3532 is
available in a low profile (0.75mm) 10-lead (3mm × 3mm)
DFN and 10-lead MSOP packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
BurstMode is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
Miniature Hard Disk Drive Power Supply
VIN
Li-Ion
2.5V TO 4.2V
200k
4.7µF
4.7µH
SW1
VIN
SHDN/SS LTC3532
BURST
RT
43.2k
0.01µF
VOUT
3.3V
100mA
TO 500mA
VOUT
200mV/DIV
SW2
340k 1k
(PEAK)
VOUT
FB
12.1k
VC
220pF
GND
33pF
200k
10µF
ILOAD
100mA/DIV
100µs/DIV
VIN = 3V
VOUT = 3.3V
ILOAD = 50mA TO 300mA
3532 TA01b
3532 TA01
3532f
1



LTC3532
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LTC3532
ABSOLUTE AXI U RATI GS (Note 1)
BURST, VIN, VOUT, VC, FB .................................. –0.3V to 6V
RT ..................................................................... 0V to 5V
SHDN/SS ..................................................... –0.3V to 6V
SW1, SW2
DC............................................................ –0.3V to 6V
Pulsed < 100ns........................................ –0.3V to 7V
Operating Temperature Range (Note 2) ... –40°C to 85°C
Storage Temperature Range
DD ..................................................... –65°C to 125°C
MSOP ................................................ –65°C to 150°C
Lead Temperature (Soldering,10 sec)
MSOP ............................................................... 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
RT
BURST
SW1
SW2
GND
1
2
3
4
5
10 VC
9 FB
11 8 SHDN/SS
7 VIN
6 VOUT
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE CONNECTED TO PCB
ORDER PART NUMBER
DD PART MARKING
LTC3532EDD
LBXR
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
TOP VIEW
RT 1
BURST 2
SW1 3
SW2 4
GND 5
10 VC
9 FB
8 SHDN/SS
7 VIN
6 VOUT
MS PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 125°C
θJA = 130°C/W 1 LAYER BOARD
θJA = 100°C/W 4 LAYER BOARD
θJC = 45°C/W
ORDER PART NUMBER
LTC3532EMS
MS PART MARKING
LTBXS
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = VOUT = 3.6V, RT = 64.9k, unless otherwise specified.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Input Start-Up Voltage
2.3 2.4
V
Input Operating Range
2.4
5.5 V
Output Voltage Adjust Range
2.4
5.25 V
Feedback Voltage
1.19 1.22 1.25
V
Feedback Input Current
Quiescent Current, Burst Mode Operation
Quiescent Current, Shutdown
Quiescent Current, Active
NMOS Switch Leakage
VFB = 1.22V
BURST = 0V
SHDN = 0V, Not Including Switch Leakage, VOUT = 0V
VC = 0V, MODE/SYNC = 0V, BURST = VIN (Note 3)
Switches B and C
1 50
35 60
0.1 1
600 1000
0.1 5
nA
µA
µA
µA
µA
PMOS Switch Leakage
Switches A and D
0.1 10
µA
NMOS Switch On Resistance
Switches B and C
0.36 Ω
PMOS Switch On Resistance
Switches A and D
0.42 Ω
Input Current Limit
0.8 1.1 1.45
A
3532f
2







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