PAM2321

Document number: DSxxxxx Rev. 2 - 1

9 of 11

www.diodes.com

January 2013

© Diodes Incorporated

PAM2321

A Product Line of

Diodes Incorporated

Short Circuit Protection

When the converter output is shorted or the device is overloaded, each high-side MOSFET current-limit event (3A typ) turns off the high-side

MOSFET and turns on the low-side MOSFET. An internal counter is used to count the each current-limit event. The counter is reset after

consecutive high-side MOSFETs turn on without reaching current limit. If the current-limit condition persists, the counter fills up. The control logic

then stops both high-side and lowside MOSFETs and waits for a hiccup period, before attemping a new soft-start sequence. The counter bits is

1.7%. The hiccup mode is disable during soft-start time.

Thermal Shutdown

When the die temperature exceeds +150°C, a reset occurs and the reset remains until the temperature decrease to +120°C, at which time the

circuit can be restarted.

PCB Layout Check List

When laying out the printed circuit board, the following checklist should be used to ensure proper operation of the PAM2321. Check the following

in your layout:

1. The input capacitor should be close to IC as close as possible.

2. Must put a small decoupling capacitor between VIN PIN and AGND Pin.

3. Minimize the switching loop area to avoid excessive switching noise.

4. AGND and PGND should connect at input capacitor GND.

5. For the good thermal dissipation, PAM2321 has a heat dissipate pad in the bottom side, it should be soldered to PCB surface. For the copper

area can't be large in the component side, so we can use mu ltiple vias connect to other side of the PCB.

Ordering Information

Part Number

Output Voltage

Part Type

Standard Package

PAM2321AYMADJ

P2321A

XXXYW

T-DFN3x3-10

3000 Units/Tape & Reel