AMS2501/AMS2502
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at I
OUT
= 0 mA, and T
J
= +25°C unless otherwise specified.
Parameter
Thermal Regulation
Dropout Voltage
Control Dropout
(V
CONTROL
- V
OUT
)
Power Dropout
(V
POWER
- V
OUT
)
AMS2501/AMS2502/-
1.5/-1.8/-2.5/-2.85/-3.0/-
3.3/-3.5/-5.0
AMS2501/AMS2502/-
1.5/-1.8/-2.5/-2.85/-3.0/-
3.3/-3.5/-5.0
Device
AMS2501/AMS2502
Conditions
T
A
= 25°C, 30ms pulse, I
LOAD
= 1A
Note 2
V
POWER
=V
OUT
+ 0.8V, I
LOAD
= 10mA
V
POWER
=V
OUT
+ 0.8V, I
LOAD
= 1A
V
CONTROL
=V
OUT
+ 2.5V, I
LOAD
= 1A
Min
Typ
0.002
Max
0.020
Units
%W
1.00
1.15
.05
.30
1.15
1.30
0.15
0.50
V
V
V
V
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 V
OUT
= V
SENSE
. For the adjustable device V
ADJ
= 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
V
POWER
(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.
V
CONTROL
(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.
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
ADMOS [ ADVANCED MONOLITHIC SYSTEMS ]
