High-Speed, Digitally Adjusted

Step-Down Controllers for Notebook CPUs

4

_______________________________________________________________________________________

%

10

15

D/A codes, includes load

regulation error

Battery voltage, V+

Overvoltage Trip Threshold

(Note 2)

FB = 2V

(Note 2)

With respect to unloaded output voltage (MAX1710)

%

CONDITIONS

65

75

Output Undervoltage

Protection Threshold

µA

950

ns

500

Minimum Off-Time

380

470

260

320

175

225

%

-1.5

1.5

DC Output Voltage Accuracy

TON = REF (400kHz)

4.5

5.5

V

2

28

Input Voltage Range

TON = GND (550kHz)

ns

140

180

On-Time

TON = open (300kHz)

UNIT

MIN

TYP

MAX

PARAMETER

V

1.98

2.02

Reference Voltage

mV

85

115

Current-Limit Threshold

(Positive Direction, Fixed)

LX to PGND

mV

35

65

Current-Limit Threshold

(Positive Direction, Adjustable)

160

240

Rising edge, hysteresis = 20mV, PWM disabled below

this level

4.1

4.4

Threshold

V

D0–D4, SHDN, SKIP, OVP

V

2.4

Logic Input High Voltage

D0–D4, SHDN, SKIP, OVP

V

0.8

Logic Input Low Voltage

SHDN, SKIP, OVP

µA

-1

1

Logic Input Current

D0–D4, each forced to GND

µA

3

10

Logic Input Pull-Up Current

ELECTRICAL CHARACTERISTICS

V

2.20

2.30

0.75

0.85

V

ELECTRICAL CHARACTERISTICS (continued)

CONDITIONS

TON logic input high level

V

TON logic input upper-mid-range level

V

3.15

3.85

TON Float Voltage

TON logic input lower-mid-range level

V

1.65

2.35

TON Reference Level

TON logic input low level

V

0.5

TON GND Level

µA

-3

3

TON Logic Input Current

UNIT

MIN

TYP

MAX

PARAMETER

With respect to unloaded output voltage (MAX1710)

(MAX1711)

(MAX1711)

%

-1.7

1.7

DAC codes from 1.32V to 2V

DAC codes from 0.925V to

1.275V