MAX877CSLASHD datasheet(3/12 Pages) MAXIM

3 / 12 page

5V/3.3V/3V/Adjustable-Output,

Step-Up/Step-Down DC-DC Converters

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VIN = 2.7V, ILOAD = 0mA, LX = 22µH, COUT = 100µF,

–

—

–

and ILIM connected to IN, AGND connected to PGND,

TA = TMIN to TMAX, typical values are at TA = +25°C, unless otherwise noted.)

Note 2: Output in regulation, VOUT = VOUT (nominal) ±4%.

Note 3: At high VIN to VOUT differentials, the maximum load current is limited by the maximum allowable power dissipation in the

package (see

Absolute Maximum Ratings and Maximum Output Current graphs in the Typical Operating Characteristics).

Note 4: Minimum value is production tested. Maximum value is guaranteed by design and is not production tested.

Note 5: VOUT is set to a target value of 5V by 0.1% external feedback resistors. VOUT is measured to be within 5V ±2.5%

to guarantee error-comparator trip point.

Note 6: Startup guaranteed under these load conditions.

PARAMETER

Maximum Switch On Time

CONDITIONS

MIN

TYP

MAX

VIN = 1V

12.6

UNITS

ISW = 400mA

µs

0.275

MAX877/MAX879

Current-Limit Temperature

Coefficient

1.3

-0.3

%/°C

Current Limit

1.0

µs

Minimum Switch Off Time

ISW = 600mA

0.33

Switch Saturation Voltage

ISW = 1000mA

0.50

MAX878

2.3

µs

ISW = 400mA

VIN = 2.5V

4.0

0.21

VIN = 1.8V

5.9

ISW = 600mA

0.31

Rectifier Forward Voltage Drop

–

—

–

Threshold

ISW = 1000mA

0.50

VIN = 1V to 6.2V

VIN/2 +0.25

Error-Comparator Trip Point

(VREF)

MAX879, VIN = 1.8V to 5V (Note 5)

197.5

202.5

207.5

FB Pin Bias Current

VIN = 2.7V

1.3

1.7

MAX879

Switch Off Leakage Current

–

—

–

Enable Delay

0.1

150

Rectifier Off Leakage Current

0.1

µA

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