MAX866/MAX867 19-0374 Rev 1 5/96 3.3V/5V or Adjustable-Output, Single-Cell DC-DC Converters General Description Features The MAX866 and MAX867 are ultra-small, high-efficiency, 0.8V to 6.0V Input Supply Voltage CMOS, step-up, DC-DC switching regulators for 1-cell 0.9V Guaranteed Start-Up Supply Voltage battery-powered systems. The MAX866 accepts a posi- tive input voltage between 0.8V and V and converts it >80% Efficiency Over Wide Load Range OUT to a higher, pin-selectable output voltage of 3.3V or 5V. 100A No-Load Battery Current (V = 3.3V) OUT The MAX867 adjustable version accepts 0.8V to 6.0V 1A Shutdown Mode input voltages and generates a higher adjustable output voltage in the 2.7V to 6.0V range. Typical efficiencies are Up to 250kHz Switching Frequency greater than 80%. Typical no-load supply current is 1.5% Reference Tolerance 100A (1A in shutdown). Low-Battery Detector (LBI/LBO) The MAX866/MAX867 combine ultra-low quiescent sup- ply current and high efficiency to give maximum battery Available in Ultra-Small 8-Pin MAX Package life. Its high switching frequency permits the use of (1.11mm high) small, low-cost inductors and capacitors. Additionally, 2 Circuit Fits in 0.2in internal peak-current limiting protects the IC. Ordering Information Applications PART TEMP. RANGE PIN-PACKAGE Pagers MAX866C/D 0C to +70C Dice* Remote Controls MAX866ESA -40C to +85C 8 SO Detectors MAX866EUA -40C to +85C 8 MAX MAX867C/D 0C to +70C Dice* 1-Cell Battery-Operated Equipment MAX867ESA -40C to +85C 8 SO Backup Supplies MAX867EUA -40C to +85C 8 MAX * Dice are tested at T = +25C only. A Pin Configurations Typical Operating Circuit INPUT TOP VIEW 0.8V TO V OUT 1 8 SHDN LX 3/5 2 7 GND 330H MAX866 3 REF 6 OUT OUTPUT 5V OR 3.3V 4 LBO 5 LBI ON/OFF SHDN LX MBRS0520LTI SO/MAX 47F OR 1N5817 MAX866 3V/5V SELECT 3/5 OUT SHDN 1 8 LX LOW-BATTERY LBI FB 2 DETECTOR 7 GND INPUT MAX867 3 REF 6 OUT LOW-BATTERY REF LBO GND DETECTOR OUTPUT 4 LBO 5 LBI 0.22F SO/MAX Maxim Integrated Products 1 For free samples & the latest literature: 3.3V/5V or Adjustable-Output, Single-Cell DC-DC Converters ABSOLUTE MAXIMUM RATINGS Supply Voltage (OUT to GND) ...................................-0.3V, +7V Reverse Battery Current (T +45C) (Note 1)................750mA A Switch Voltage (LX to GND) .......................................-0.3V, +7V Operating Temperature Ranges SHDN, LBO to GND ....................................................-0.3V, +7V MAX86 C/D .......................................................0C to +70C LBI, REF, 3/5, FB to GND ............................-0.3V, (V + 0.3V) MAX86 E A ....................................................-40C to +85C OUT Reference Current (I ) ..................................................2.5mA Junction Temperature .....................................................+150C REF Continuous Power Dissipation (T = +70C) Storage Temperature Range ............................-65C to +160C A SO (derate 5.88mW/C above +70C) .........................471mW Lead Temperature (soldering, 10sec) ............................+300C MAX (derate 4.1mW/C above +70C) ......................330mW Note 1: Reverse battery current is measured from the Typical Operating Circuits battery input terminal to GND when the battery is connected backwards. A reverse current of 750mA will not exceed the package dissipation limits but, if left for an extended time (more than ten minutes), may degrade performance. 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 (Circuit of Figure 2, V = 1.2V, I = 0mA, T = +25C, unless otherwise noted.) IN LOAD A PARAMETER CONDITIONS MIN TYP MAX UNITS Minimum Start-Up 0.8 0.9 V Supply Voltage MAX866, 3/5 = 0V, 0mA I 6mA LOAD 4.80 5.0 5.20 0.9V VIN 3V MAX866, 3/5 = 3V, 0mA ILOAD 8mA 3.17 3.3 3.43 MAX867, V = 5V, 0mA I 6mA 4.80 5.0 5.20 OUT LOAD MAX866, 3/5 = 0V, 0mA ILOAD 6mA 4.75 5.0 5.25 0.9V VIN 3V, Output Voltage MAX866, 3/5 = 3V, 0mA I 8mA 3.13 3.3 3.47 V T T T LOAD A = MIN TO MAX (Note 2) (Note 3) MAX867, V = 5V, 0mA I 6mA OUT LOAD 4.75 5.0 5.25 MAX866, 3/5 = 0V, 0mA I 10mA 4.80 5.0 5.20 LOAD 1.2V V 3V MAX866, 3/5 = 3V, 0mA I 15mA IN LOAD 3.17 3.3 3.43 MAX867, V = 5V, 0mA I 10mA 4.80 5.0 5.20 OUT LOAD MAX866, 3/5 = 0V, 4.8V V 5.2V LOAD 69 0.9V V 3V MAX866, 3/5 = 3V, 3.17V VLOAD 3.43V 813 IN MAX867, V = 5V, 4.8V V 5.2V 69 OUT LOAD Maximum Load Current mA (Note 2) MAX866, 3/5 = 0V, 4.8V VLOAD 5.2V 10 15 1.2V V 3V MAX866, 3/5 = 3V, 3.17V V 3.43V 15 23 IN LOAD MAX867, V = 5V, 4.8V V 5.2V OUT LOAD 10 15 Quiescent Supply Current in I = 0mA, 3/5 = 3V, LBI = 1.5V, LOAD 27 60 A 3.3V mode (Note 4) V = 3.47V, FB = 1.5V OUT No-Load Battery Current Output set for 3.3V, measured at VIN in Figure 2, VIN = 1.5V 100 A Shutdown Quiescent Current SHDN = 0V, 3/5 = 3V, LBI = 1.5V, V = 3.47V, OUT 1 A (Note 4) FB = 1.5V Peak Inductor Current Limit 500 mA Reference Voltage No REF load 1.22 1.25 1.28 V Reference Load Regulation 3/5 = 3V, -20A REF load 250A, C = 0.22F 0.8 2.0 % REF LBI Input Threshold With falling edge 1.22 1.25 1.28 V 2 MAX866/MAX867