Dual-Output Step-Down

DC-DC Converter for PDA/Palmtop Computers

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3

ELECTRICAL CHARACTERISTICS (continued)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

CORE REGULATOR

Input Voltage Range

2.6

5.5

V

2.40

2.47

2.55

INC Undervoltage Lockout

2.30

2.37

2.45

V

Core Output Voltage Adjust

Range

1.0

5.0

V

Maximum Core Load Current

(Note 1)

1

1.5

A

FBC Regulation Threshold

0.97

1.0

1.03

V

FBC Input Current

-0.1

0.1

µA

Dropout Voltage (INC to LXC)

0.1

0.25

V

LXC Leakage Current

-10

10

µA

LXC P-Channel, N-Channel

On-Resistance

0.25

0.5

Ω

LXC P-Channel Current Limit

1200

1800

3000

mA

LXC P-Channel Minimum

Current

100

200

400

mA

LXC N-Channel Valley Current

900

1400

2400

mA

LXC N-Channel Zero-Crossing

Current

40

110

170

mA

LXC Dead Time

50

ns

Maximum Duty Cycle

100

%

Minimum On-Time

170

400

670

ns

Minimum Off-Time

170

400

670

ns

REFERENCE

Reference Voltage

1.23

1.25

1.27

V

Reference Load Regulation

10

mV

Reference Line Regulation

5

mV

Reference Sink Current

10

µA

CVL, CVH REGULATORS

2.6

2.8

3.1

CVL Output Voltage

3.2

V

CVL Switchover Threshold

2.40

2.47

2.55

V

CVH Output Voltage

V

CVH Switchover Threshold

5.5

V

2.40

2.47

2.55

CVL Undervoltage Lockout

2.30

2.37

2.45

V