MAX856 查看數據表（PDF） - Maxim Integrated

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MAX856

3.3V/5V or Adjustable-Output, Step-Up DC-DC Converters

Maxim Integrated 

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 _______________________________________________________________________________________

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