LTC3532 Micropower Synchronous Buck-Boost DC/DC Converter FEATURES DESCRIPTIO Single Inductor The LTC 3532 is a high ef ciency, xed frequency, buck- Regulated Output with Input Voltages Above, Below boost DC/DC converter that operates from input voltages or Equal to the Output above, below or equal to the output voltage. The topology Wide V Range: 2.4V to 5.5V incorporated in the IC provides a continuous transfer IN V Range: 2.4V to 5.25V function through all operating modes, making the product OUT Up to 500mA Peak Output Current ideal for single lithium-ion, multicell alkaline or NiMH ap- Synchronous Recti cation: Up to 95% Ef ciency plications where the output voltage is within the battery Manual or Programmable Automatic Burst Mode voltage range. Operation The device includes two 0.36 N-channel MOSFET Output Disconnect in Shutdown switches and two 0.42 P-channel switches. Switching Programmable Oscillator: 300kHz to 2MHz frequencies up to 2MHz are programmed with an external Pin Compatible with LTC3440 resistor. Quiescent current is only 35A in Burst Mode Small Thermally Enhanced 10-Lead (3mm 3mm) operation, maximizing battery life in portable applica- DFN and 10-Lead MSOP Packages tions. Automatic Burst Mode operation allows the user to program the load current for Burst Mode operation or U to control it manually. APPLICATIO S Other features include a 1A shutdown, soft-start control, Miniature Hard Disk Drive Power Supply thermal shutdown, and peak current limit. The LTC3532 is MP3 Players available in a low pro le (0.75mm) 10-lead (3mm 3mm) Handheld Instruments DFN and 10-lead MSOP packages. Digital Cameras , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Handheld Terminals Burst Mode 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 V OUT 3.3V 4.7H V OUT 100mA 200mV/DIV TO 500mA (PEAK) 340k 1k SW2 SW1 V IN Li-Ion V V OUT IN 2.5V TO 4.2V SHDN/SS FB LTC3532 33pF I 12.1k LOAD 100mA/DIV BURST V C 220pF R GND T 3532 TA01b 100s/DIV V = 3V IN 200k 43.2k 200k 10F V = 3.3V OUT I = 50mA TO 300mA LOAD 4.7F 0.01F 3532 TA01 3532fc 1 U ULTC3532 ABSOLUTE AXI U RATI GS (Note 1) Maximum Junction Temperature (Note 4)............. 125C BURST, V , V , V , FB 0.3V to 6V IN OUT C ................................... Storage Temperature Range R ..................................................................... 0V to 5V T DD ..................................................... 65C to 125C SHDN/SS ..................................................... 0.3V to 6V MSOP ................................................ 65C to 150C SW1, SW2 Lead Temperature (Soldering,10 sec) DC ............................................................ 0.3V to 6V MSOP ...............................................................300C Pulsed < 100ns ........................................ 0.3V to 7V Operating Temperature Range (Note 2).... 40C to 85C PI CO FIGURATIO TOP VIEW TOP VIEW R 1 10 V T C R 1 10 V T C BURST 2 9 FB BURST 9 FB 2 SW1 3 8 SHDN/SS SW2 4 7 V 3 11 IN SW1 8 SHDN/SS GND 5 6 V OUT 4 SW2 7 V IN MS PACKAGE GND 5 6 V OUT 10-LEAD PLASTIC MSOP T = 125C JMAX DD PACKAGE = 130C/W 1 LAYER BOARD JA 10-LEAD (3mm 3mm) PLASTIC DFN = 100C/W 4 LAYER BOARD JA T = 125C, = 43C/W JMAX JA = 45C/W JC EXPOSED PAD (PIN 11) IS GND, MUST BE CONNECTED TO PCB UUW ORDER I FOR ATIO LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3532EDD PBF LTC3532EDD TRPBF LBXR 10-Lead (3mm 3mm) Plastic DFN 40C to 85C LTC3532EMS PBF LTC3532EMS TRPBF LTBXS 10-Lead Plastic MSOP 40C to 85C Consult LTC Marketing for parts speci ed with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based nish parts. For more information on lead free part marking, go to: