Datasheet MAX856, MAX857, MAX858, MAX859 (Maxim) - 2

3.3V/5V or Adjustable-Output, Step-Up DC-DC Converters ABSOLUTE MAXIMUM RATINGS
Supply Voltage (OUT to GND) ...-0.3V, +7V Reverse Battery Current (TA ≤ +45°C, Note 1) ...750mA Switch Voltage (LX to GND) ...-0.3V, +7V Operating Temperature Ranges ———– SHDN, LBO to GND ..-0.3V, +7V MAX85_C_ _ ..0°C to +70°C – LBI, REF, 3/5, FB to GND ...-0.3V, (VOUT + 0.3V) MAX85_E_ _ ..-40°C to +85°C Reference Current (IREF) ..2.5mA MAX85_MJA ...-55°C to +125°C Continuous Power Dissipation (TA = +70°C) Junction Temperature ...+150°C SO (derate 5.88mW/°C above +70°C) ...471mW Storage Temperature Range ..-65°C to +160°C µMAX (derate 4.1mW/°C above +70°C) ..330mW Lead Temperature (soldering, 10sec) ..+300°C CERDIP (derate 8.00mW/°C above +70°C) ...640mW
Note 1:
Reverse battery current is measured from the Typical Operating Circuit’s battery input terminal to GND when the battery is connected backwards. A reverse current of 750mA will not exceed the SO or CERDIP 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.
MAX856–MAX859 ELECTRICAL CHARACTERISTICS
(Circuits of Figure 2, VIN = 2.5V, ILOAD = 0mA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
– MAX856, 3/5 = 0V, 0mA ≤ ILOAD ≤ 100mA 4.80 5.0 5.20 – MAX856, 3/5 = 3V, 0mA ≤ ILOAD ≤ 150mA 3.17 3.3 3.43 MAX857, VOUT = 5V, 0mA ≤ ILOAD ≤100mA 4.80 5.0 5.20 Output Voltage 2V ≤ VIN ≤ 3V V – MAX858, 3/5 = 0V, 0mA ≤ ILOAD ≤ 25mA 4.80 5.0 5.20 – MAX858, 3/5 = 3V, 0mA ≤ ILOAD ≤ 35mA 3.17 3.3 3.43 MAX859, VOUT = 5V, 0mA ≤ ILOAD ≤ 25mA 4.80 5.0 5.20 Minimum Start-Up ILOAD = 0mA 0.8 1.8 V Supply Voltage Minimum Operating Voltage 0.8 V – Quiescent Supply Current in ILOAD = 0mA, 3/5 = 3V, LBI = 1.5V, VOUT = 3.47V, 25 60 µA 3.3V Mode (Note 2) (FB = 1.5V, MAX857/MAX859 only) No Load Battery Current Output set for 3.3V, measured at VIN in Figure 2, R3 omitted. 60 µA ———– – Shutdown Quiescent Current SHDN = 0V, 3/5 = 3V, LBI = 1.5V, V MAX85_C 1 OUT = 3.47V, µA (Note 2) (FB = 1.5V, MAX857/MAX859 only) MAX85_E/M 1 5 MAX856/MAX857 500 Peak Inductor Current Limit mA MAX858/MAX859 125 Reference Voltage No REF load 1.23 1.25 1.27 V – Reference-Voltage Regulation 3/5 = 3V, -20µA ≤ REF load ≤ 250µA, CREF = 0.22µF 0.8 2.0 % LBI Input Threshold With falling edge 1.22 1.25 1.28 V LBI Input Hysteresis 25 mV LBO Output Voltage Low ISINK = 2mA 0.4 V LBO Output Leakage Current LBO = 5V 1 µA
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