AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
Description Pin Assignments
The AP7331 is a 300mA, adjustable and fixed output
SOT25 (Fixed Output) SOT25 (ADJ Output)
voltage, low dropout linear regulator. The device included
(Top View) (Top View)
pass element, error amplifier, band-gap, current limit and
thermal shutdown circuitry. The device is turned on when EN
1 5
IN OUT
pin is set to logic high level.
2
GND
The characteristics of low dropout voltage and low quiescent
current make it suitable for low power applications, for
EN 3 4 NC
example, battery powered devices. The typical quiescent
current is approximately 65A.
Built-in current-limit and thermal-shutdown functions prevent
DFN2020-6 (Fixed Output)
DFN2020-6 (ADJ Output)
IC from damage in fault conditions.
(Top View)
(Top View)
The AP7331 is available in SOT25 and DFN2020-6
EN 1 6
NC EN 1 6
ADJ
packages.
2 5
GND GND 2 5
NC NC
3 OUT 3 4 OUT
IN 4 IN
Features Applications
300mA Low Dropout Regulator with EN XDSL Routers
Very low I over full load: 65A Wireless LAN Cards
Q
Wide input voltage range: 2V to 6V Desktop and Notebook Computers
Wide adjustable output: 0.8V to 5.0V Battery Powered Equipments
Fixed output options: 1.0V to 3.3V
PSRR: 65dB typical at 100Hz
Fast start-up time: 80s
Stable with low ESR, 1F ceramic output capacitor
Excellent Load/Line Transient Response
Low dropout: 300mV typical at 300mA
Current limit protection
Short circuit protection
Thermal shutdown protection
Ambient temperature range: -40C to 85C
SOT25 and DFN2020-6: Available in Green Molding
Compound (No Br, Sb)
Lead Free Finish/RoHS Compliant (Note 1)
Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
Typical Application Circuit
V V
V IN V
IN OUT
OUT
IN OUT
IN OUT
AP7331
AP7331
R1
1uF 1uF
1uF
1uF
Enable
Enable
ADJ
EN
EN
GND
GND
R2
Adjustable Output
Fixed Output
R
1
V = V 1 +
OUT REF
R
2
Pin Descriptions
Pin Number
Pin Name SOT25 DFN2020-6 SOT25 DFN2020-6 Description
(fixed) (fixed) (adj) (adj)
Voltage input pin. Bypass to ground through at least
IN 1 3 1 3
1F capacitor
GND 2 2 2 2 Ground
EN 3 1 3 1 Enable input, active high
ADJ - - 4 6 Output feedback pin
NC 4 5, 6 - 5 No connection
Voltage output pin. Bypass to ground through 1F
OUT 5 4 5 4
ceramic capacitor
Functional Block Diagram
IN OUT
IN OUT
Current Limit
Current Limit
Gate
Gate
EN and Thermal
Driver EN and Thermal
Shutdown R Driver
Shutdown
ADJ
0.4V
0.4V
R
GND
GND
Fixed Version
Adjustable Version
2 of 13 January 2011
AP7331
Diodes Incorporated
www.diodes.com
Document number: DS31914 Rev. 3 - 2