MAX1878_11 datasheet(3/12 Pages) MAXIM

Part #	MAX1878

Description	Dual-Output Step-Down and LCD Step-Up Power Supply for PDAs

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Manufacturer	MAXIM [Maxim Integrated Products]

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Dual-Output Step-Down and LCD Step-Up

Power Supply for PDAs

_______________________________________________________________________________________

3

ELECTRICAL CHARACTERISTICS (continued)

(VIN = VAIN = 2.5V, circuit of Figure 1, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

LX Max Duty Cycle

VFB = 0.8V

100

%

LX Leakage Current

VON = 0V, VIN = 5.5V

0.1

5

µA

VIN = VAIN = 2V, ILX = 300mA

0.55

0.95

LX P-Channel On-Resistance

VIN = VAIN = 3V, ILX = 300mA

0.42

0.65

Ω

VIN = VAIN = 2V, ILX = 300mA

0.62

0.93

LX N-Channel On-Resistance

VIN = VAIN = 3V, ILX = 300mA

0.46

0.65

Ω

LX Current Limit

330

550

800

mA

Idle Mode Threshold

70

135

220

mA

LX Minimum On-Time

tLXON

240

440

740

ns

LX Minimum Off-Time

tLXOFF

200

390

670

ns

ON Input Low Voltage

2V < VIN < 5.5V

0.4

V

ON Input High Voltage

2V < VIN < 5.5V

1.3

V

ON Input Leakage Current

-1

1

µA

LCD OUTPUT (Step-Up Converter)

LCD Output Voltage Adjust Range

VLCD

VIN + 1V

28

V

TA = +25°C to +85°C

1.225

1.250

1.275

FBLCD Regulation Voltage

VFBLCD

VIN = VAIN = 2V

TA = 0°C to +85°C

1.220

1.280

V

VAIN = VIN = 2V, ILXLCD = 150mA

2.8

5.0

LXLCD On-Resistance

VAIN = VIN = 3V, ILXLCD = 150mA

1.7

3.0

Ω

LXLCD Current Limit

140

280

440

mA

LXLCD Leakage Current

VLXLCD = 28V

0

1

µA

VAIN = VIN = 2.5V, VLCD = 18V

1.5

7.6

LCD Output Current

(Note 3)

ILCD

VAIN = VIN = 2V, VLCD = 18V

1.4

6.6

mA

FBLCD Input Bias Current

IFBLCD

VAIN = VIN = 2V

10

50

nA

LCD Line Regulation

VAIN = VIN = 2V to 3V, ILOAD = 5mA,

VLXLCD = 18V

1%

LCD Load Regulation

VAIN = VIN = 2.5V, ILOAD = 1mA to 5mA,

VLXLCD = 18V

1.3

%

LXLCD Maximum On-Time

tLXLCDON

5.1

9.8

17

µs

0.5

1.0

1.7

LXLCD Minimum Off-Time

tLXLCDOFF

VFBLCD < 0.9V (soft-start)

1.3

2.6

4.4

µs

ONLCD Input Low Voltage

2V < VAIN = VIN < 5.5V

0.4

V

ONLCD Input High Voltage

2V < VAIN = VIN < 5.5V

1.3

V

ONLCD Input Leakage Current

-1

1

µA

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