1MHz, All-Ceramic, 2.6V to 5.5V Input,

2A PWM Step-Down DC-to-DC Regulators

4

_______________________________________________________________________________________

Note 3: Specifications to -40°C are guaranteed by design and not production tested.

Note 4: The LX output is designed to provide 2.4A RMS current.

ELECTRICAL CHARACTERISTICS (continued)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

COMP

MAX1951

40

80

COMP Transconductance

MAX1952

26.7

53.3

µS

COMP Clamp Voltage, Low

0.6

1.2

V

COMP Clamp Voltage, High

1.97

2.28

V

COMP Shutdown Resistance

30

Ω

COMP rising

1.2

COMP Shutdown Threshold

When LX starts/stops switching

COMP falling

0.17

V

COMP Startup Current

COMP = GND

14

40

µA

FB

Output Voltage Range

(MAX1951)

When using external feedback resistors to drive FB

0.8

V

MAX1951

0.783

0.807

FB Regulation Voltage

(Error Amp Only)

MAX1952

1.764

1.836

V

FB Input Resistance

From FB to GND

MAX1952

10

30

k

Ω

FB Input Bias Current

MAX1951

-0.1

+0.1

µA

LX (Note 4)

LX On-Resistance, PMOS

266

m

Ω

LX On-Resistance, NMOS

206

m

Ω

LX Current Sense

0.16

0.35

Ω

LX Current-Limit Threshold

2.4

4.5

A

10

LX Leakage Current

LX = GND

-10

µA

LX Switching Frequency

0.8

1.1

MHz

LX Maximum Duty Cycle

100

%