19-4232; Rev 0; 8/08 500kHz, 36V Output, 600mW PWM Step-Up DC-DC Converter General Description Features MAX15032 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, high output voltages, with an output power capability ♦ Wide Adjustable Output Voltage Range: (VIN + 1V) 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 or varactor diode biasing and LCD displays. The IN MAX15032 operates from +2.7V to +11V. ♦ Internal 0.5Ω (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 power switch allows this device to boost output volt- ♦ 500kHz (typ) Switching Frequency ages up to 36V. The MAX15032 features a shutdown ♦ 0.5µA (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 -40°C to +125°C auto- TDFN Package motive temperature range. Applications Ordering Information Avalanche Photodiode Biasing PIN- TOP PART TEMP RANGE PIN Diode Bias Supplies PACKAGE MARK Low-Noise Varactor Diode Bias Supplies MAX15032ATA+T -40°C to +125°C 8 TDFN-EP* +BKP STB Audio IC Supplies +Denotes a lead-free/RoHS-compliant package. T = Tape and reel. LCD Displays *EP = Exposed pad. Pin Configuration Typical Operating Circuit TOP VIEW L1 PGNDCP CN IN 8657 D1 V V = 2.7V TO 5.5V IN LX OUT IN 36V SHDN R1 MAX15032 FB MAX15032 CIN CP COUT PGND CCP R2 + CN GND 1 2 34 LXGND FB SHDN TDFN ________________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s 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 (θJC) (Note 1) ........8°C/W LX to PGND ............................................................-0.3V to +40V Junction-to-Ambient Thermal Resistance (θJA) FB to GND ..............................................................-0.3V to +12V (Note 1) ........................................................................41°C/W SHDN to GND..............................................-0.3V to (VIN + 0.3V) Operating Temperature Range .........................-40°C to +125°C CN to GND .............................................................-0.3V to +12V Junction Temperature......................................................+150°C CP to GND..............................................................-0.3V to +12V Storage Temperature Range .............................-65°C to +150°C PGND to GND .......................................................-0.3V to +0.3V Lead Temperature (soldering, 10s) .................................+300°C Continuous Power Dissipation (TA = +70°C) 8-Pin TDFN (derate 24.4mW/°C above +70°C) ......1951.2mW MAX15032 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 (VIN = +3.3V, V SHDN = +3.3V, CIN = 10µF, PGND = GND = 0V, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. See the Typical Operating Circuit.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS SUPPLY VOLTAGE CCP = 10nF 2.7 5.5 Supply Voltage Range VIN V CP connected to IN 5.5 11 V = 1.4V (no switching), C = 10nF, FB CP 12 VIN = 3.3V Supply Current IIN mA V = 1.4V (no switching), CP = IN, FB 1.5 3 VIN = 11V Undervoltage Lockout VUVLO VIN rising 2.375 2.5 2.675 V Undervoltage Lockout Hysteresis VUVLO-HYS 100 mV Shutdown Current ISHDN V SHDN = 0V 0.5 µA LOGIC INPUT (SHDN) SHDN Input Low Level VIL 0.8 V SHDN Input High Level VIH 2.0 V BOOST CONVERTER Output Voltage Adjustment V + 1 36 V Range IN Switching Frequency fSW 450 500 550 kHz FB Set Point VFB 1.214 1.245 1.276 V FB Input Bias Current IFB 300 nA CCP = 10nF, VIN = 2.9V, VCP = 5.5V 0.42 1 ILX = 100mA VIN = 5.5V, VCP = 10V 0.33 1 LX Switch On-Resistance RDS_ON Ω CP connected to VIN = VCP = 5.5V 0.42 1 IN, ILX = 100mA VIN = VCP = 11V 0.33 1 Peak Switch Current Limit ILIM_LX 1 1.33 1.7 A LX Leakage Current VLX = 36V 2 µA Line Regulation ILOAD = 2mA 0.25 % 2 _______________________________________________________________________________________ 500kHz, 36V Output, 600mW PWM Step-Up DC-DC Converter ELECTRICAL CHARACTERISTICS (continued) MAX15032 (VIN = +3.3V, V SHDN = +3.3V, CIN = 10µF, PGND = GND = 0V, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. See the Typical Operating Circuit.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Load Regulation ILOAD = 0 to 20mA, VOUT = 30V 1 % Soft-Start Duration 8ms Soft-Start Steps (0.25 x ILIM_LX) to ILIM_LX 32 Steps THERMAL PROTECTION Thermal Shutdown Rising +160 °C Thermal-Shutdown Hysteresis 8°C Note 2: All devices are 100% production tested at room temperature (TA = +25°C). All parameter limits through the temperature range are guaranteed by design. Typical Operating Characteristics (VIN = 3.3V, L1 = 4.7µH, R1 = 143kΩ, R2 = 6.2kΩ, CIN = 10µF, COUT = 2.2µF, CCP = 10nF, see the Typical Operating Circuit. TA = +25°C, unless otherwise noted.) EFFICIENCY EFFICIENCY EFFICIENCY vs. LOAD CURRENT vs. LOAD CURRENT vs. LOAD CURRENT 85 85 85 VOUT = 36V V = 30V 80 80 OUT 80 VIN = 5V VIN = 5V MAX15032 toc03 75 MAX15032 toc01 75 MAX15032 toc02 75 VOUT = 24V VOUT = 24V 70 70 70 VIN = 5V VIN = 3.3V V = 36V 65 OUT 65 65 V = 3.3V IN VOUT = 30V 60 60 60 VIN = 3.3V 55 55 55 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 50 50 50 45 45 45 40 40 40 35 35 35 0202 4 6 8 10 12 14 16 18 0202 4 6 8 10 12 14 16 18 0505 10 15 20 25 30 35 40 45 LOAD CURRENT (mA) LOAD CURRENT (mA) LOAD CURRENT (mA) _______________________________________________________________________________________ 3 500kHz, 36V Output, 600mW PWM Step-Up DC-DC Converter Typical Operating Characteristics (continued) (VIN = 3.3V, L1 = 4.7µH, R1 = 143kΩ, R2 = 6.2kΩ, CIN = 10µF, COUT = 2.2µF, CCP = 10nF, see the Typical Operating Circuit. TA = +25°C, unless otherwise noted.) EFFICIENCY MAXIMUM LOAD CURRENT MINIMUM STARTUP VOLTAGE vs. LOAD CURRENT vs. INPUT VOLTAGE vs. LOAD CURRENT 90 360 2.80 L = 4.7μH FOR VOUT = 36V, 30V, AND 24V VOUT = 30V 85 330 2.75 80 300 MAX15032 toc06 MAX15032 toc04 MAX15032 toc05 2.70 75 270 V = 12V VOUT = 12V 2.65 MAX15032 OUT 240 VOUT = 24V 70 VOUT = 12V L = 3.3μH VIN = 5V VIN = 3.3V 210 2.60 65 VOUT = 30V 180 2.55 60 150 2.50 EFFICIENCY (%) 55 120 2.45 50 90 MAXIMUM LOAD CURRENT (mA) 45 MINIMUM STARTUP VOLTAGE (V) 2.40 60 VOUT = 36V 40 2.35 L = 3.3μH 30 35 0 2.30 0505 10 15 20 25 30 35 40 45 2113 4 5 6 7 8 9 10 0202 4 6 8 10 12 14 16 18 LOAD CURRENT (mA) INPUT VOLTAGE (V) LOAD CURRENT (mA) SUPPLY CURRENT SUPPLY CURRENT SWITCHING FREQUENCY vs. SUPPLY VOLTAGE vs. TEMPERATURE vs. TEMPERATURE 1.6 1.00 550 VFB = 1.4V VFB = 1.4V VIN = 5V 1.4 0.95 540 MAX15032 toc07 MAX15032 toc09 0.90 MAX15032 toc08 530 1.2 0.85 520 1.0 0.80 510 0.8 0.75 500 0.6 0.70 490 SUPPLY CURRENT (mA) SUPPLY CURRENT (mA) 0.65 480 0.4 0.60 SWITCHING FREQUENCY (kHz) 470 0.2 0.55 460 0 0.50 450 2113 4 5 6 7 8 9 10 -40-25 -10 5 20 35 50 65 80 95 110 125 -40-25 -10 5 20 35 50 65 80 95 110 125 SUPPLY VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) EXITING SHUTDOWN ENTERING SHUTDOWN SWITCHING WAVEFORMS MAX15032 toc10 MAX15032 toc11 MAX15032 toc12 VIN = 5V VIN = 5V V VSHDN V OUT IOUT = 1mA IOUT = 1mA SHDN (AC-COUPLED) 2V/div 2V/div 50mV/div VOUT 10V/div VLX 20V/div VOUT 10V/div I L I 500mA/div L 500mA/div IOUT = 20mA 1ms/div 20ms/div 1μs/div 4 _______________________________________________________________________________________ 500kHz, 36V Output, 600mW PWM Step-Up DC-DC Converter Typical Operating Characteristics (continued) MAX15032 (VIN = 3.3V, L1 = 4.7µH, R1 = 143kΩ, R2 = 6.2kΩ, CIN = 10µF, COUT = 2.2µF, CCP = 10nF, see the Typical Operating Circuit. TA = +25°C, unless otherwise noted.) FB VOLTAGE LOAD-TRANSIENT RESPONSE LINE-TRANSIENT RESPONSE vs. TEMPERATURE MAX15032 toc13 MAX15032 toc14 1.29 RISE TIME = 10ns IOUT = 1mA 1.28 VOUT VIN (AC-COUPLED) MAX15032 toc15 1V/div 200mV/div 1.27 1.26 1.25 FB VOLTAGE (V) 1.24 IOUT VOUT 5mA/div (AC-COUPLED) 1.23 50mV/div 1.22 1.21 100ms/div 2ms/div -40-25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) SWITCH ON-RESISTANCE LX LEAKAGE CURRENT SHUTDOWN SUPPLY CURRENT vs.