PRODUCT SPECIFICATION

FAN2510/FAN2511

2

REV. 1.0.6 2/14/03

Pin Assignments

Pin Descriptions

Pin No.

FAN2510

FAN2510-XX

FAN2511-XX

1.

2.

GND

GND

GND

3.

EN

EN

EN

4.

ADJ

BYP

ERR

5.

Pin Name

Pin No.

Type

Pin Function Description

ADJ

4

Input

FAN2510 Adjust. Ratio of potential divider from VOUT to ADJ

determines output voltage.

BYP

4

Passive

FAN2510-XX Bypass. Connect 470 pF capacitor for noise reduction.

ERR

4

Open drain

FAN2511-XX Error. Error flag output.

0: Output voltage < 95% of nominal.

1: Output voltage > 95% of nominal.

EN

3

Digital Input

Enable.

1

Power in

Voltage Input. Supply voltage input.

5

Power out

Voltage Output. Regulated output voltage.

GND

2

Power

Ground.

15

2

3

GND

EN

4

ADJ/BYP/ERR

Functional Description

Designed utilizing CMOS process technology, the

FAN2510/11 family of products are carefully optimized for

use in compact battery-powered devices, offering a unique

combination of low power consumption, extremely low

dropout voltages, high tolerance for a variety of output

capacitors, and the ability to disable the output to less than

1µA under user control. In the circuit, a difference amplifier

controls the current through a series-pass P-Channel

MOSFET, comparing the load voltage at the output with an

onboard low-drift bandgap reference. The series resistance

of the pass P-Channel MOSFET is approximately 1

Ω, result-

ing in an unusually low dropout voltage under load when

compared to older bipolar pass-transistor designs.

Protection circuitry is provided onboard for overload condi-

tions. In conditions where the device reaches temperatures

exceeding the specified maximums, an onboard circuit shuts

down the output, where it remains suspended until it has

cooled before re-enabling. The user is also free to shut down

the device using the Enable control pin at any time.

Careful design of the output regulator amplifier assures loop

stability over a wide range of ESR values in the external

output capacitor. A wide range of values and types can be

accommodated, allowing the user to select a capacitor

meeting his space, cost, and performance requirements,

and enjoy reliable operation over temperature, load, and

tolerance variations.