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MAX1775

Dual-Output Step-Down DC-DC Converter for PDA/Palmtop Computers

Maxim Integrated 

Dual-Output Step-Down

DC-DC Converter for PDA/Palmtop Computers

ELECTRICAL CHARACTERISTICS (continued)

(VIN = +12V, VMAIN = VINC = VCS- = VCS+ = +3.3V, VCORE = +1.8V, Circuit of Figure 4, TA = 0°C to +85°C, unless otherwise noted.

Typical values are at TA = +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX UNITS

CORE REGULATOR

Input Voltage Range

INC Undervoltage Lockout

VINC

VINC rising

VINC falling

2.6

5.5

V

2.40 2.47 2.55

V

2.30 2.37 2.45

Core Output Voltage Adjust

Range

1.0

5.0

V

Maximum Core Load Current

FBC Regulation Threshold

FBC Input Current

Dropout Voltage (INC to LXC)

LXC Leakage Current

LXC P-Channel, N-Channel

On-Resistance

VFBC

IFBC

ILXC

(Note 1)

VINC = +2.5 to +5.5V, IOUTC = 0 to 200mA

VFBC = +1.3V

IOUTC = 400mA

VINC = +5.5V, VLXC = 0 to +5.5V

1

1.5

A

0.97 1.0 1.03

V

-0.1

0.1

µA

0.1 0.25

V

-10

10

µA

0.25

0.5

Ω

LXC P-Channel Current Limit

LXC P-Channel Minimum

Current

ICLC

1200 1800 3000 mA

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

Maximum Duty Cycle

Minimum On-Time

Minimum Off-Time

REFERENCE

Reference Voltage

Reference Load Regulation

Reference Line Regulation

Reference Sink Current

CVL, CVH REGULATORS

CVL Output Voltage

CVL Switchover Threshold

CVH Output Voltage

CVH Switchover Threshold

CVL Undervoltage Lockout

VREF

IREF

IREF = 0 to 50µA

VCS- = +2.5V to +5.5V, IREF = 50µA

VCVL

VCVH

VIN

ICVL = 50mA, VIN = +2.7V, VCS- = 0

ICVL = 50mA, VCS- = +3.3V

VCS- rising, hysteresis = 100mV (typ)

VIN = +4V, ICVH = 25mA

VIN = +12V, ICVH = 50mA

VIN rising, hysteresis = 350mV (typ)

VCVL rising

VCVL falling

50

ns

100

%

170

400

670

ns

170

400

670

ns

1.23 1.25 1.27

V

10

mV

5

mV

10

µA

2.6

2.8

3.1

V

3.2

2.40 2.47 2.55

V

VIN - 3.4 VIN - 2.8 V

VIN - 4.3 VIN - 3.7

5.5

V

2.40 2.47 2.55

V

2.30 2.37 2.45

_______________________________________________________________________________________ 3

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