AMS2501CS datasheet(3/8 Pages) ADMOS

3 / 8 page

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AMS2501/AMS2502

ELECTRICAL CHARACTERISTICS

Electrical Characteristics at IOUT = 0 mA, and TJ = +25°C unless otherwise specified.

Parameter

Device

Conditions

Min

Typ

Max

Units

Thermal Regulation

AMS2501/AMS2502

TA = 25°C, 30ms pulse, ILOAD = 1A

0.002

0.020

Dropout Voltage

Note 2

Control Dropout

(VCONTROL - VOUT)

AMS2501/AMS2502/-

1.5/-1.8/-2.5/-2.85/-3.0/-

3.3/-3.5/-5.0

VPOWER =VOUT + 0.8V, ILOAD = 10mA

VPOWER =VOUT + 0.8V, ILOAD = 1A

1.00

1.15

1.30

Power Dropout

(VPOWER - VOUT)

AMS2501/AMS2502/-

1.5/-1.8/-2.5/-2.85/-3.0/-

3.3/-3.5/-5.0

VCONTROL =VOUT + 2.5V, ILOAD = 1A

.05

.30

0.15

0.50

Parameters identified with boldface type apply over the full operating temperature range.

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. For guaranteed specifications and test conditions, see the

Electrical Characteristics

. The guaranteed specifications apply only for the test conditions listed.

Note 2: Unless otherwise specified VOUT = VSENSE. For the adjustable device VADJ = 0V.

Note 3: The dropout voltage for the AMS2501/AMS2502 is caused by either minimum control voltage or minimum power voltage. The specifications

represent the minimum input/output voltage required to maintain 1% regulation.

Note 4: For the adjustable device the minimum load current is the minimum current required to maintain regulation. Normally the current in the resistor

divider used to set the output voltage is selected to meet the minimum load current requirement.

Note 5: The control pin current is the drive current required for the output transistor. This current will track output current with a ratio of about 1:100. The

minimum value is equal to the quiescent current of the device.

PIN FUNCTIONS

VPOWER (Pin 1): This pin is the collector to the power

device of the AMS2501/AMS2502. The output load

current is supplied through this pin. The voltage at this pin

must be between 0.1V and 0.8V greater than the output

voltage for the device to regulate.

Output (Pin 2 and 3): These are the power output of the

device. Pin 2 and 3 are fused together and with the

package paddle serving also as heat sink.

Sense (Pin 4): This pin is the positive side of the reference

voltage for the device. With this pin it is possible to Kelvin

sense the output voltage at the load.

On/Off (Pin 5 AMS2502 only): This pin puts the device

in a stand-by mode.

Reference (Pin 7 AMS2502 only): This pin allows the

user to add a bypass capacitor on the reference voltage.

Adjust (Pin 6): This pin is the negative side of the

reference voltage for the device. Adding a small bypass

capacitor from the Adjust pin to ground improves the

transient response. For fixed voltage devices the Adjust

pin is also brought out to allow the user to add a bypass

capacitor.

GND (Pin 6): For fixed voltage devices this is the

bottom of the resistor divider that sets the output

voltage.

VCONTROL (Pin 8): This pin is the supply pin for the

control circuitry of the device. The current flow into

this pin will be about 1% of the output current. The

voltage at this pin must be between 1.0V and 1.3V

greater than the output voltage for the device to

regulate.

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