MAX858CSLASHD datasheet(2/12 Pages) MAXIM

2 / 12 page

3.3V/5V or Adjustable-Output,

Step-Up DC-DC Converters

_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

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.)

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.

Supply Voltage (OUT to GND) ...................................-0.3V, +7V

Switch Voltage (LX to GND) .......................................-0.3V, +7V

—

–

, LBO to GND ....................................................-0.3V, +7V

LBI, REF, 3/

–

, FB to GND .........................-0.3V, (VOUT + 0.3V)

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.

LBO = 5V

ISINK = 2mA

With falling edge

–

= 3V, -20µA

≤ REF load ≤ 250µA, CREF = 0.22µF

No REF load

MAX858/MAX859

ILOAD = 0mA, 3/

–

= 3V, LBI = 1.5V, VOUT = 3.47V,

(FB = 1.5V, MAX857/MAX859 only)

MAX856/MAX857

—

–

= 0V, 3/

–

= 3V, LBI = 1.5V, VOUT = 3.47V,

(FB = 1.5V, MAX857/MAX859 only)

≤ VIN ≤ 3V

ILOAD = 0mA

Output set for 3.3V, measured at VIN in Figure 2, R3 omitted.

CONDITIONS

µA

LBO Output Leakage Current

0.4

LBO Output Voltage Low

LBI Input Hysteresis

1.22

1.25

1.28

LBI Input Threshold

0.8

2.0

Reference-Voltage Regulation

1.23

1.25

1.27

Reference Voltage

125

500

µA

Shutdown Quiescent Current

(Note 2)

µA

No Load Battery Current

4.80

5.0

5.20

3.17

3.3

3.43

4.80

5.0

5.20

µA

Quiescent Supply Current in

3.3V Mode (Note 2)

0.8

Minimum Operating Voltage

4.80

5.0

5.20

3.17

3.3

3.43

4.80

5.0

5.20

Output Voltage

0.8

1.8

Minimum Start-Up

Supply Voltage

UNITS

MIN

TYP

MAX

PARAMETER

Peak Inductor Current Limit

MAX856, 3/

–

= 0V, 0mA

≤ ILOAD ≤ 100mA

MAX856, 3/

–

= 3V, 0mA

≤ ILOAD ≤ 150mA

MAX857, VOUT = 5V, 0mA ≤ ILOAD ≤100mA

MAX858, 3/

–

= 0V, 0mA

≤ ILOAD ≤ 25mA

MAX858, 3/

–

= 3V, 0mA

≤ ILOAD ≤ 35mA

MAX859, VOUT = 5V, 0mA ≤ ILOAD ≤ 25mA

MAX85_C

MAX85_E/M

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