MAX777L datasheet(3/12 Pages) MAXIM

Part #	MAX777L

Description	Low-Voltage Input, 3V/3.3V/5V/ Adjustable Output, Step-Up DC-DC Converters

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Manufacturer	MAXIM [Maxim Integrated Products]

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Low-Voltage Input, 3V/3.3V/5V/

Adjustable Output, Step-Up DC-DC Converters

_______________________________________________________________________________________

3

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).

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 5V ±2.5% to guarantee the

error comparator trip point.

Note 6: Start-Up guaranteed under these load conditions.

PARAMETER

Maximum Switch On Time

MIN

TYP

MAX

12.6

UNITS

Switch Saturation Voltage

µs

0.275

1.2

-0.3

µs

%/°C

Current Limit

1.0

A

Minimum Switch Off Time

0.33

0.50

V

2.2

4.0

0.21

V

5.9

0.31

Rectifier Forward Voltage Drop

SHDN Threshold

0.50

Error-Comparator Trip Point

197.5

202.5

207.5

VIN/2 + 0.25

mV

V

FB Pin Bias Current

1.20

1.6

10

40

nA

Switch Off Leakage Current

SHDN Enable Delay

0.1

µA

150

µs

Rectifier Off Leakage Current

0.1

µA

CONDITIONS

VIN = 1V

ISW = 400mA

MAX777L, MAX779L

ISW = 600mA

ISW = 1000mA

MAX778

ISW = 400mA

VIN = 2.5V

VIN = 1.8V

ISW = 600mA

ISW = 1000mA

MAX779L, over operating input voltage (Note 5)

VIN = 1V to 4.5V

VIN = 2.5V

MAX779L, VFB = 0.3V

ELECTRICAL CHARACTERISTICS (continued)

(VIN = +2.5V, ILOAD = 0mA, L = 22µH, COUT = 100µF, SHDN and ILIM connected to IN, AGND connected to PGND, TA = TMIN to TMAX,

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

Current-Limit Temperature

Coefficient

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