MAX879C 데이터 시트보기 (PDF) - Maxim Integrated

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MAX879C

5V/3.3V/3V/Adjustable-Output, Step-Up/Step-Down DC-DC Converters

Maxim Integrated 

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, –S—H—D—N– and ILIM connected to IN, AGND connected to PGND,

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

PARAMETER

–S—H—D—N– Threshold

–S—H—D—N– Enable Delay

Current Limit

VIN = 1V to 6.2V

VIN = 2.7V

CONDITIONS

MIN TYP MAX

VIN/2 +0.25

1.3

1.7

150

1.0

UNITS

V

µs

A

Current-Limit Temperature

Coefficient

-0.3

%/°C

Switch Saturation Voltage

Maximum Switch On Time

Minimum Switch Off Time

Rectifier Forward Voltage Drop

Error-Comparator Trip Point

(VREF)

FB Pin Bias Current

Switch Off Leakage Current

Rectifier Off Leakage Current

ISW = 400mA

ISW = 600mA

ISW = 1000mA

VIN = 2.5V

VIN = 1.8V

VIN = 1V

MAX877/MAX879

MAX878

ISW = 400mA

ISW = 600mA

ISW = 1000mA

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

MAX879

0.275

0.33

V

0.50

4.0

5.9

µs

12.6

1.3

µs

2.3

0.21

0.31

V

0.50

197.5 202.5 207.5 mV

10

40

nA

0.1

µA

0.1

µA

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.

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