D52LC datasheet(3/12 Pages) MAXIM

3 / 12 page

16µA IQ, 1.2A PWM DC-DC

Step-Down Converters

_______________________________________________________________________________________

Note 1: All units are 100% production tested at TA = +25°C. Limits over the operating range are guaranteed by design.

Note 2: For the MAX1556, 3.3V output accuracy is specified with a 4.2V input.

ELECTRICAL CHARACTERISTICS (continued)

(VIN = VINP = VSHDN = 3.6V, TA = - 40°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.) (Note 1)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VIN = 2.6V to 3.6V

-0.37

MAX1556,

D1 = IN, D2 = GND;

MAX1556A

D1 = D2 = IN

VIN = 3.6V to 5.5V

0.33

VIN = 2.6V to 3.6V

-0.1

Line Regulation

MAX1557,

D1 = IN, D2 = GND

VIN = 3.6V to 5.5V

0.09

VIN = 3.6V

0.19

0.35

MAX1556/MAX1556A

VIN = 2.6V

0.23

VIN = 3.6V

0.35

0.7

p-Channel On-Resistance

MAX1557

VIN = 2.6V

0.42

Ω

VIN = 3.6V

0.27

0.48

n-Channel On-Resistance

VIN = 2.6V

0.33

Ω

MAX1556/MAX1556A

1.5

1.8

2.1

p-Channel Current-Limit

Threshold

MAX1557

0.8

1.0

1.2

n-Channel Zero Crossing

Threshold

MAX1556/MAX1556A

1.8

RMS LX Output Current

MAX1557

1.0

ARMS

TA = +25°C

0.1

LX Leakage Current

VIN = 5.5V, LX =

GND or IN

TA = +85°C

0.1

µA

Maximum Duty Cycle

100

Minimum Duty Cycle

Internal Oscillator Frequency

0.9

1.1

MHz

SS Output Impedance

∆VSS / ISS for ISS = 2µA

130

200

300

Ω

SS Discharge Resistance

SHDN = GND, 1mA sink current

200

Ω

Thermal-Shutdown Threshold

+160

°C

Thermal-Shutdown Hysteresis

°C

LOGIC INPUTS (D1, D2,

SHDN)

Input-Voltage High

2.6V

≤ VIN ≤ 5.5V

1.4

Input-Voltage Low

0.4

TA = +25°C

0.1

Input Leakage

TA = +85°C

0.1

µA

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