MAX15032 19-4232 Rev 0 8/08 500kHz, 36V Output, 600mW PWM Step-Up DC-DC Converter General Description Features The MAX15032 constant-frequency, pulse-width-modu- Input Voltage Range lating (PWM), low-noise boost converter is intended for +2.7V to +5.5V (Using Internal Charge Pump) low-voltage systems that need a locally generated high +5.5V to +11V voltage. This device is capable of generating low-noise, Wide Adjustable Output Voltage Range: (V + 1V) high output voltages, with an output power capability IN up to 600mW with a 2.9V input voltage. This device can to 36V be used for a wide variety of applications, such as PIN Output Power: 600mW for V 2.9V IN or varactor diode biasing and LCD displays. The MAX15032 operates from +2.7V to +11V. Internal 0.5 (typ), 40V Switch The constant-frequency (500kHz), current-mode PWM Constant PWM Frequency Provides Easy Filtering architecture provides low-noise output voltage that is in Low-Noise Applications easy to filter. A high-voltage internal lateral DMOS 500kHz (typ) Switching Frequency power switch allows this device to boost output volt- ages up to 36V. The MAX15032 features a shutdown 0.5A (max) Shutdown Current mode to save power. Internal Soft-Start The MAX15032 is available in a small thermally enhanced 3mm x 3mm 8-pin TDFN package and is Small Thermally Enhanced 3mm x 3mm 8-Pin specified for operation over the -40C to +125C auto- TDFN Package motive temperature range. Applications Ordering Information Avalanche Photodiode Biasing PIN- TOP PART TEMP RANGE PACKAGE MARK PIN Diode Bias Supplies MAX15032ATA+T -40C to +125C 8 TDFN-EP* +BKP Low-Noise Varactor Diode Bias Supplies +Denotes a lead-free/RoHS-compliant package. STB Audio IC Supplies T = Tape and reel. LCD Displays *EP = Exposed pad. Pin Configuration Typical Operating Circuit L1 TOP VIEW PGND CP CN IN 867 5 D1 V OUT V = 2.7V TO 5.5V IN LX IN 36V SHDN R1 MAX15032 FB MAX15032 C C IN OUT CP PGND C CP R2 CN + GND 1 2 34 LX GND FB SHDN TDFN Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.500kHz, 36V Output, 600mW PWM Step-Up DC-DC Converter ABSOLUTE MAXIMUM RATINGS IN to GND...............................................................-0.3V to +12V Junction-to-Case Thermal Resistance ( ) (Note 1) ........8C/W JC LX to PGND ............................................................-0.3V to +40V Junction-to-Ambient Thermal Resistance ( ) JA FB to GND ..............................................................-0.3V to +12V (Note 1) ........................................................................41C/W SHDN to GND..............................................-0.3V to (V + 0.3V) Operating Temperature Range .........................-40C to +125C IN CN to GND .............................................................-0.3V to +12V Junction Temperature......................................................+150C CP to GND..............................................................-0.3V to +12V Storage Temperature Range .............................-65C to +150C PGND to GND .......................................................-0.3V to +0.3V Lead Temperature (soldering, 10s) .................................+300C Continuous Power Dissipation (T = +70C) A 8-Pin TDFN (derate 24.4mW/C above +70C) ......1951.2mW Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four- layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (V = +3.3V, V = +3.3V, C = 10F, PGND = GND = 0V, T = T = -40C to +125C, unless otherwise noted. Typical values IN SHDN IN A J are at T = +25C. See the Typical Operating Circuit.) (Note 2) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS SUPPLY VOLTAGE C = 10nF 2.7 5.5 CP Supply Voltage Range V V IN CP connected to IN 5.5 11 V = 1.4V (no switching), C = 10nF, FB CP 12 V = 3.3V IN Supply Current I mA IN V = 1.4V (no switching), CP = IN, FB 1.5 3 V = 11V IN Undervoltage Lockout V V rising 2.375 2.5 2.675 V UVLO IN Undervoltage Lockout Hysteresis V 100 mV UVLO-HYS Shutdown Current I V = 0V 0.5 A SHDN SHDN LOGIC INPUT (SHDN) SHDN Input Low Level V 0.8 V IL SHDN Input High Level V 2.0 V IH BOOST CONVERTER Output Voltage Adjustment V + 1 36 V IN Range Switching Frequency f 450 500 550 kHz SW FB Set Point V 1.214 1.245 1.276 V FB FB Input Bias Current I 300 nA FB V = 2.9V, V = 5.5V 0.42 1 IN CP C = 10nF, CP I = 100mA LX V = 5.5V, V = 10V 0.33 1 IN CP LX Switch On-Resistance R DS ON V = V = 5.5V 0.42 1 IN CP CP connected to IN, I = 100mA LX V = V = 11V 0.33 1 IN CP Peak Switch Current Limit I 1 1.33 1.7 A LIM LX LX Leakage Current V = 36V 2 A LX Line Regulation I = 2mA 0.25 % LOAD 2 MAX15032