5V/3.3V/3V 2A Step-Down, PWM,

Switch-Mode DC-DC Regulators

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3

ELECTRICAL CHARACTERISTICS (continued)

Note 1: Do not exceed switch-to-input voltage limitation.

Note 2: For switch currents between 1A and 2A, maximum switch-on voltage can be calculated via linear interpolation.

approximating the zero load condition.

switch-on time.

Note 6: Guaranteed, not production tested.

0% duty cycle

0% duty cycle

mV/°C

Thermal Resistance Junction to Case

(Note 6)

°C/W

4.0

V

-4

1.5

Output Voltage Line Regulation

%/V

0.005

0.020

8V

±1.0

±3.0

3.3V (MAX728), or 3V (MAX729);

all conditions of input voltage,

output voltage, and load

current

Output Voltage Tolerance

%

±0.5

±2.0

MAX729

MAX728

MAX727

MAX729

MAX728

MAX727

CONDITIONS

2.2

3.8

6.5

SENSE Pin Divider Resistance

2.5

4.2

7.0

k

Ω

3.0

5.0

8.0

2.90

3.00

3.10

SENSE Voltage

3.20

3.30

3.40

V

4.85

5.00

5.15

UNITS

MIN

TYP

MAX

PARAMETER

______________________________________________________________Pin Description

5

Ground requires a short, low-noise connection to ensure good load regulation. The internal refer-

ence is referred to GND, so errors at this pin are multiplied by the error amplifier.

Error-Amplifier Output. A series RC network connected to this pin compensates the

MAX727/MAX728/MAX729. Output swing is limited to about 5.8V in the positive direction and

external TTL clock in the 115kHz to 170kHz range. See MAX724/MAX726 data sheet.

4

3

2

1

PIN

GND

SENSE

FUNCTION

NAME