3.3V/5V or Adjustable-Output,
Step-Up DC-DC Converters
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (OUT to GND) ...................................-0.3V, +7V
SS—Hw—LDiB—tcNI–,h,RVLEoBFlOt,a3gt/oe–5–,G(FLNBXDttoo...GG..NN...DD...)...........................................................................-..0.......3....V....,....(..V....O....--U00T..33+VV,,0++.377VVV)
Reference Current (IREF) ..................................................2.5mA
Continuous Power Dissipation (TA = +70°C)
SO (derate 5.88mW/°C above +70°C) .........................471mW
µMAX (derate 4.1mW/°C above +70°C) ......................330mW
CERDIP (derate 8.00mW/°C above +70°C) .................640mW
Reverse Battery Current (TA ≤ +45°C, Note 1) .................750mA
Operating Temperature Ranges
MAX85_C_ _ ......................................................0°C to +70°C
MAX85_E_ _ ....................................................-40°C to +85°C
MAX85_MJA .................................................-55°C to +125°C
Junction Temperature .....................................................+150°C
Storage Temperature Range ............................-65°C to +160°C
Lead Temperature (soldering, 10sec) ............................+300°C
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.
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
Output Voltage
Minimum Start-Up
Supply Voltage
Minimum Operating Voltage
Quiescent Supply Current in
3.3V Mode (Note 2)
2V ≤ VIN ≤ 3V
ILOAD = 0mA
CONDITIONS
MAX856, 3/–5– = 0V, 0mA ≤ ILOAD ≤ 100mA
MAX856, 3/–5– = 3V, 0mA ≤ ILOAD ≤ 150mA
MAX857, VOUT = 5V, 0mA ≤ ILOAD ≤100mA
MAX858, 3/–5– = 0V, 0mA ≤ ILOAD ≤ 25mA
MAX858, 3/–5– = 3V, 0mA ≤ ILOAD ≤ 35mA
MAX859, VOUT = 5V, 0mA ≤ ILOAD ≤ 25mA
ILOAD = 0mA, 3/–5– = 3V, LBI = 1.5V, VOUT = 3.47V,
(FB = 1.5V, MAX857/MAX859 only)
MIN TYP
4.80 5.0
3.17 3.3
4.80 5.0
4.80 5.0
3.17 3.3
4.80 5.0
MAX UNITS
5.20
3.43
5.20
V
5.20
3.43
5.20
0.8 1.8 V
0.8
V
25
60 µA
No Load Battery Current
Output set for 3.3V, measured at VIN in Figure 2, R3 omitted.
Shutdown Quiescent Current S—H—D—N– = 0V, 3/–5– = 3V, LBI = 1.5V, VOUT = 3.47V,
(Note 2)
(FB = 1.5V, MAX857/MAX859 only)
MAX85_C
MAX85_E/M
Peak Inductor Current Limit
MAX856/MAX857
MAX858/MAX859
Reference Voltage
No REF load
Reference-Voltage Regulation 3/–5– = 3V, -20µA ≤ REF load ≤ 250µA, CREF = 0.22µF
LBI Input Threshold
With falling edge
LBI Input Hysteresis
LBO Output Voltage Low
ISINK = 2mA
LBO Output Leakage Current LBO = 5V
60
µA
1
µA
1
5
500
mA
125
1.23 1.25 1.27 V
0.8 2.0 %
1.22 1.25 1.28 V
25
mV
0.4 V
1 µA
2 _______________________________________________________________________________________