MAX1709ESE

EVALUATION KIT AVAILABLE 4A, Low-Noise, High-Frequency, Step-Up DC-DC Converter MAX1709 General Description Benefits and Features The MAX1709 sets a new standard of space savings for high-power, step-up DC-DC conversion. It delivers up to 20W at a fixed (3.3V or 5V) or adjustable (2.5V to 5.5V) output, using an on-chip power MOSFET from a +0.7V to +5V supply. Fixed-frequency PWM operation ensures that the switching noise spectrum is constrained to the 600kHz fundamental and its harmonics, allowing easy postfiltering for noise reduction. External clock synchronization capability allows for even tighter noise spectrum control. Quiescent power consumption is less than 1mW to extend operating time in battery-powered systems. Two control inputs (ONA, ONB) allow simple push-on, push-off control through a single momentary pushbutton switch, as well as conventional on/off logic control. The MAX1709 also features programmable soft-start and current limit for design flexibility and optimum performance with batteries. • Integration Reduces External Component Count to Save Space • On-Chip 10A Power MOSFET • 5V, 4A Output from a 3.3V Input • Fixed 3.3V or 5V Output Voltage or Adjustable (2.5V to 5.5V) • Input Voltage Range Down to 0.7V • Constant Frequency Reduces Post-Filtering • Low-Noise, Constant-Frequency Operation (600kHz) • Synchronizable Switching Frequency (350kHz to 1000kHz) The MAX1709 is supplied in both a high-power TSSOP package, which allows a 10ARMS switch current and a 4A output, and a narrow SO package, which supplies a 2.4A output with a switch rated at 6ARMS. Although the narrow SO device has a lower RMS switch rating, it has the same peak switch current rating as the TSSOP device, and so can supply 4A loads intermittently. If loads of 2A or less are required, refer to the MAX1708. Routers, Servers, Workstations, Card Racks Local 2.5V to 3.3V or 5V Conversion Local 3.3V to 5V Conversion 3.6V or 5V RF PAs in Communications Handsets Typical Operating Circuit 1µH SYNC OR INTERNAL CLK LX MAX1709 GND SS/LIM REF PART TEMP RANGE -40°C to +85°C 16 Narrow SO MAX1709EUI+ -40°C to +85°C 28 TSSOP-EP* +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. OUT TOP VIEW ONA 1 28 ONB LX 2 27 CLK LX 3 OUTPUT 3.3V, 5V, OR ADJ UP TO 4A 26 3.3/5 MAX1709 25 NC LX 5 24 NC LX 6 23 PGND LX 7 22 PGND LX 8 21 PGND NC 9 20 PGND NC 10 19 PGND GND 11 18 PGND SS/ILM 12 17 NC REF 13 16 FB GND 14 15 OUT TSSOP-EP 19-1724; Rev 3; 2/15 PIN-PACKAGE MAX1709ESE LX 4 INPUT 1V TO 5V ONA Ordering Information Pin Configuration Applications OFF ON • Lower Power Consumption Extends Battery Life • 1mW Quiescent Power 4A, Low-Noise, High-Frequency, Step-Up DC-DC Converter MAX1709 Absolute Maximum Ratings ONA, ONB, OUT, SS/LIM, 3.3/5 to GND ...............-0.3V to +6.0V LX to PGND ...........................................................-0.3V to +6.0V FB, CLK, REF to GND.............................. -0.3V to (VOUT + 0.3V) PGND to GND .......................................................-0.3V to +0.3V Continuous Power Dissipation (TA = +70°C) 16-Pin Narrow SO (derate 16.5mW/°C above +70°C) .....1.3W 28-Pin TSSOP Exposed Pad (derate 23.8mW/°C above +70°C) ...................................1.9W 28-Pin TSSOP Exposed Pad Junction-to-Exposed Pad Thermal Resistance ......................................……1.2°C/W Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C 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 (VOUT = VCLK = +3.6V, ONA = ONB = FB = GND, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER CONDITIONS 3.26 3.34 3.42 5.05 5.17 -0.25 -0.45 1.240 1.265 V 1 200 nA 5.5 V Measured between 1A < ISW < 3A (Note 2) ISW = 1A UNITS 4.92 Load Regulation VFB = +1.5V MAX 3.3/5 = GND, ISW = 1A VFB < 0.1V (Note 1) FB Input Current TYP 3.3/5 = OUT, ISW = 1A Output Voltage FB Regulation Voltage MIN Output Voltage Adjust Range 1.215 2.5 V %/A Output Undervoltage Lockout (Note 3) 2.0 2.3 V Frequency in Startup Mode VOUT =1.5V 40 400 kHz Minimum Startup Voltage IOUT < 1mA (Note 1), TA = +25°C (Note 4) 1.1 V Minimum Operating Voltage (Note 5) Soft-Start Pin Current VSS/LIM = 1V 4 5.0 µA OUT Supply Current VFB = 1.5V (Note 6) 200 440 µA V ONB = 3.6V 0.1 5 µA VLX = V ONB = VOUT = +5.5V 0.1 40 µA 22 40 mΩ OUT Leakage Current In Shutdown LX Leakage Current n-Channel Switch On-Resistance n-Channel Current Limit RMS Switch Current 0.7 3.2 SS/LIM = open 7.5 SS/LIM = 150kΩ to GND 3.5 V 9 12 5 6.5 MAX1709EUI+ 10 MAX1709ESE 6 Reference Voltage IREF = 0 Reference Load Regulation -1µA < IREF < 50µA Reference Supply Rejection +2.5V < VOUT < +5.5V 1.245 A ARMS 1.260 1.275 V 4 10 mV 0.2 5 mV ONA, ONB, 3.3/5, 1.2V < VOUT < 5.5V 0.2 × VOUT CLK, 2.7V < VOUT < 5.5V 0.2 × VOUT Input Low Level (Note 7) www.maximintegrated.com 0.9 V Maxim Integrated | 2 4A, Low-Noise, High-Frequency, Step-Up DC-DC Converter MAX1709 Electrical Characteristics (continued) (VOUT = VCLK = +3.6V, ONA = ONB = FB = GND, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER Input High Level Logic Input Current CONDITIONS MIN ONA, ONB, 3.3/5, 1.2V < VOUT