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MAX1706 Dataheets PDF



Part Number MAX1706
Manufacturers Maxim
Logo Maxim
Description 1- to 3-Cell / High-Current / Low-Noise / Step-Up DC-DC Converters
Datasheet MAX1706 DatasheetMAX1706 Datasheet (PDF)

19-1198; Rev 0; 4/97 1- to 3-Cell, High-Current, Low-Noise, Step-Up DC-DC Converters with Linear Regulator _______________General Description The MAX1705/MAX1706 are high-efficiency, low-noise, step-up DC-DC converters with an auxiliary linearregulator output. These devices are intended for use in battery-powered wireless applications. They use a synchronous rectifier pulse-width-modulation (PWM) boost topology to generate 2.5V to 5.5V outputs from battery inputs, such as 1 to 3 NiCd/NiMH cells.

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19-1198; Rev 0; 4/97 1- to 3-Cell, High-Current, Low-Noise, Step-Up DC-DC Converters with Linear Regulator _______________General Description The MAX1705/MAX1706 are high-efficiency, low-noise, step-up DC-DC converters with an auxiliary linearregulator output. These devices are intended for use in battery-powered wireless applications. They use a synchronous rectifier pulse-width-modulation (PWM) boost topology to generate 2.5V to 5.5V outputs from battery inputs, such as 1 to 3 NiCd/NiMH cells or 1 Li-Ion cell. The MAX1705 has an internal 1A N-channel MOSFET switch. The MAX1706 has a 0.5A switch. Both devices also have a built-in low-dropout linear regulator that delivers up to 200mA. With an internal synchronous rectifier, the MAX1705/ MAX1706 deliver 5% better efficiency than similar nonsynchronous converters. They also feature a pulsefrequency-modulation (PFM) standby mode to improve efficiency at light loads, and a 1µA shutdown mode. An efficiency-enhancing track mode reduces the step-up DC-DC converter output to 300mV above the linear-regulator output. Both devices come in a 16-pin QSOP package, which occupies the same space as an 8-pin SO. Other features include two shutdown-control inputs for push-on/push-off control, and an uncommitted comparator for use as a voltage monitor. ANUAL N KIT M IO T A U EVAL BLE AVAILA ____________________________Features o Up to 96% Efficiency o 1.1VIN Guaranteed Start-Up o Up to 850mA Output (MAX1705) o Step-Up Output (2.5V to 5.5V adjustable) o Linear Regulator (1.25V to 5.0V adjustable) o PWM/PFM Synchronous-Rectified Topology o 300kHz PWM Mode or Synchronizable o 1µA Shutdown Mode o Voltage Monitor o Pushbutton On/Off Control MAX1705/MAX1706 ______________Ordering Information PART MAX1705C/D TEMP. RANGE 0°C to +70°C PIN-PACKAGE Dice* 16 QSOP -40°C to +85°C MAX1705EEE Dice* MAX1706C/D 0°C to +70°C 16 QSOP MAX1706EEE -40°C to +85°C *Dice are tested at TA = +25°C, DC parameters only. ________________________Applications Digital Cordless Phones Personal Communicators Palmtop Computers Hand-Held Instruments PCS Phones Wireless Handsets Two-Way Pagers __________Typical Operating Circuit INPUT 0.7V TO 5.5V __________________Pin Configuration LOW-BATTERY DETECTION LX LBP POUT OUT STEP-UP OUTPUT TOP VIEW LBP 1 LBN 2 REF 3 TRACK 4 GND 5 OUT 6 FB 7 FBLDO 8 16 POUT LBO 15 ONA 14 ONB MAX1705 MAX1706 FB ON/OFF CONTROL HIGH EFFICIENCY LOW NOISE ONA ONB CLK/SEL TRACK LBN REF LDO FBLDO GND PGND LINEAR REGULATOR OUTPUT MAX1705 MAX1706 13 LX 12 PGND 11 CLK/SEL 10 LBO 9 LDO QSOP ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 1- to 3-Cell, High-Current, Low-Noise, Step-Up DC-DC Converters with Linear Regulator MAX1705/MAX1706 ABSOLUTE MAXIMUM RATINGS ONA, ONB, FBLDO, OUT, POUT to GND...................-0.3V to 6V PGND to GND.....................................................................±0.3V POUT to OUT ......................................................................±0.3V LX to PGND ............................................-0.3V to (VPOUT + 0.3V) CLK/SEL, REF, FB, TRACK, LDO, LBN, LBP, LBO to GND.......................-0.3V to (VOUT + 0.3V) LDO Short Circuit .......................................................Continuous Continuous Power Dissipation (TA = +70°C) QSOP (derate 8.70mW/°C above +70°C) ...................696mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +160°C Lead Temperature (soldering, 10sec) .............................+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 = VPOUT = VLBP = 3.6V, CLK/SEL = FB = LBN = LBO = ONA = ONB = TRACK = GND, REF = open (bypassed with 0.22µF), LX = open, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER DC-DC CONVERTER Minimum Start-Up Voltage Minimum Operating Battery Voltage FB Regulation Voltage FB Input Current OUT Adjust Range Load Regulation MAX1705, 0A ≤ ILX ≤ 0.5A; MAX1706, 0A ≤ ILX ≤ 0.25A; CLK/SEL = OUT TRACK = VLDO > 2.3V fLX VPOUT = VOUT = 1.5V (Note 2) IOUT IOUT ONA = GND, ONB = OUT, measure IOUT CLK/SEL = GND, VFB = VFBLDO = 1.5V, no load VFB = VFBLDO = 1.5V, no load IOUT CLK/SEL = OUT FB = GND (LX switching) IREF = 0µA -1µA < IREF < 50µA 2.5V < VOUT < 5.5V 1.238 2.1 1.250 4 0.2 1.262 15 5 mA V mV mV VLDO + 0.2 40 2.00 TA = +25°C, ILOAD < 1mA, Figure 2 (Note 1).


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