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
Note 2
0.002
0.020
%W
Dropout Voltage
Control Dropout
(VCONTROL - VOUT
AMS2501/AMS2502/-1.5/- VPOWER =VOUT + 0.8V, ILOAD = 10mA
1.8/-2.5/-2.85/-3.0/-3.3/-
VPOWER =VOUT + 0.8V, ILOAD = 1A
3.5/-5.0
V
V
1.00
1.15
1.15
1.30
)
Power Dropout
AMS2501/AMS2502/-1.5/- VCONTROL =VOUT + 2.5V, ILOAD = 1A
1.8/-2.5/-2.85/-3.0/-3.3/-
3.5/-5.0
V
V
.05
.30
0.15
0.50
(VPOWER - VOUT
)
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.
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.
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.
GND (Pin 6): For fixed voltage devices this is the
bottom of the resistor divider that sets the output
voltage.
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.
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.
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.
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
ADMOS [ ADVANCED MONOLITHIC SYSTEMS ]
