DS2501 Advanced Monolithic Systems, DS2501 Datasheet - Page 3

• Manufacturer Part Number: DS2501
• Description: 1A VERY LOW DROPOUT VOLTAGE REGULATORS
• Manufacturer: Advanced Monolithic Systems

ELECTRICAL CHARACTERISTICS
Electrical Characteristics at I
Parameter
Thermal Regulation
Dropout Voltage
Control Dropout
(V
Power Dropout
(V
Parameters identified with boldface type apply over the full operating temperature range.
Note 1:
Electrical Characteristics
Note 2:
Note 3:
the minimum input/output voltage required to maintain 1% regulation.
Note 4:
used to set the output voltage is selected to meet the minimum load current requirement.
Note 5:
minimum value is equal to the quiescent current of the device.
PIN FUNCTIONS
V
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.
POWER
CONTROL
POWER
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- V
Unless otherwise specified V
For the adjustable device the minimum load current is the minimum current required to maintain regulation. Normally the current in the resistor divider
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. For guaranteed specifications and test conditions, see the
The dropout voltage for the AMS2501/AMS2502 is caused by either minimum control voltage or minimum power voltage. The specifications represent
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
- V
(Pin 1): This pin is the collector to the power
OUT
OUT
)
)
Device
AMS2501/AMS2502
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
.
The guaranteed specifications apply only for the test conditions listed.
OUT
OUT
= V
= 0 mA, and T
SENSE
. For the adjustable device V
Conditions
T
Note 2
V
V
V
A
POWER
POWER
CONTROL
= 25°C, 30ms pulse, I
J
= +25°C unless otherwise specified.
=V
=V
=V
OUT
OUT
OUT
+ 0.8V, I
+ 0.8V, I
+ 2.5V, I
ADJ
LOAD
LOAD
LOAD
LOAD
= 0V.
= 10mA
= 1A
= 1A
= 1A
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 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.
CONTROL
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(Pin 8): This pin is the supply pin for the
AMS2501/AMS2502
Min
0.002
1.00
1.15
Typ
.05
.30
Max
0.020
1.15
1.30
0.15
0.50
Units
%W
V
V
V
V