MAX830 datasheet(3/5 Pages) MAXIM

3 / 5 page

5V/3.3V/3V/Adjustable-Output, 1A,

Step-Down, PWM, Switch-Mode DC-DC Regulators

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VIN = 25V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)

Note 2: For switch currents between 0.2A and 1A, maximum switch-on voltage can be calculated via linear interpolation.

Note 3: By setting the SENSE pin to 5.5V (or the FB pin to 2.5V), the VC pin is forced to its low clamp level and the switch duty cycle

is forced to zero, approximating the zero load condition.

Note 4: Device shut down. Switch leakage current not included.

Note 5: For proper regulation, total voltage from VIN to GND must be ≥ 8V after start-up. During start-up mode, device is switching

but not regulating.

Note 6: To avoid extremely short switch-on times, the switch frequency is internally scaled down when VFB or VSENSE is less than

1.3V. Switch current limit is tested with VSENSE or VFB adjusted to give a 1µs minimum switch-on time.

Note 7:

Note 8: All conditions of input voltage, output voltage, temperature, and load current.

Note 9: FB is at the reference voltage when the MAX830 output voltage is in regulation.

7.6k

LIM

=×











 +Ω

Ω

PARAMETER

CONDITIONS

VC Voltage Temperature Coefficient

MAX831

MAX832

MIN

TYP

MAX

UNIT

MAX833

0% duty cycle

MAX831

MAX832

MAX833

TA = +25°C

mV/°C

FB Bias Current

0.5

2.0

Reference Voltage

VREF (nominal = 2.21V) (MAX830)

TA = +25°C

1.5

VC Voltage

0% duty cycle

-4

4.85

5.00

5.15

3.20

3.30

3.40

µA

VSHUT = 5V

SENSE Voltage

VC = 2V

2.90

3.00

3.10

≤ VIN ≤ 30V

SHUT Current

0.005

0.020

%/V

Output Voltage Line Regulation

3.0

5.0

8.0

VSHUT = 0.1V (shutdown)

Ω

µA

2.5

4.2

7.0

SENSE Divider Resistance

TA = +25°C

2.2

3.8

6.5

(shutdown)

0.10

0.20

0.50

SENSE Voltage Tolerance (Note 8)

VOUT (nominal) = 5V (MAX831),

3.3V (MAX832), or 3V (MAX833)

±0.5

±2.0

2.155

2.21

2.265

SHUT Threshold

Reference Voltage Tolerance

(Notes 8, 9)

±0.5

±1.5

TA = +25°C

VFB = VREF (MAX830)

VC = 2V (MAX830) (Note 9)

±1.0

±2.5

Typical value only. Minimum to maximum deviation in current limit will be ±30%,

comparable to that with ILIM pin open.

±0.5

±3.0

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