LND5203-3.0 Просмотр технического описания (PDF) - Linear Dimensions Semiconductor

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LND5203-3.0

3 A Low Dropout Positive Voltage Regulator

Linear Dimensions Semiconductor 

LND5203

The* denotes the specifications which apply over the full temperature range.

Note 1: Unless otherwise specified Vout=Vsense. For LND5203 (adj.) Vadj=0V

Note 2: 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 3: The control pin current is the drive current required for the output transistor. This current will track output with

a ratio of about 1:100.

Note 4: The dropout voltage for the LND5203 is caused by either minimum control voltage or minimum power voltage.

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

PIN FUNCTIONS (5-LEAD)

Sense (Pin 1): This pin is the positive

side of the reference voltage. With this

pin it is possible to Kelvin sense the

output voltage at the load.

Adjust (Pin 2): This pin is the negative

side of the reference voltage. 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 2): For fixed voltage devices

this is the bottom of the resistor divider

that sets the output voltage.

BLOCK DIAGRAM

Vpower (Pin 5): This pin is the

collector of the power transistor. The

output load current is supplied

through this pin. The voltage at this

pin must be 0.7V greater than the

output voltage for the device to

regulate.

Vcontrol (pin 4): This pin is the supply

pin for the control circuitry. The

current flow into this pin will be about

1% of the output current. The

voltage at this pin must be 1.3V

greater than the output voltage for

the device to regulate.

Output (Pin 3): This is the power

output of the device.

• Linear Dimensions, Inc. • 445 East Ohio Street, Chicago IL 60611 USA • tel 312.321.1810 • fax 312.321.1830 • www.lineardimensions.com •

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