PS22924
12V, 2A Fast Transient Response Linear Regulator
Preliminary
Data Sheet 292205 issue 1
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
V
IN
Range 1.7 – 12V
Fixed and adjustable output voltage
2A maximum output current
350mV typical dropout voltage
Bypass output for low PSRR and output noise
Power Good pin with 500µs delay
Low self noise
Shutdown mode for longer battery life
High PSRR typically 60dB at 100Hz
Stable with a wide range of Ceramic, Tantalum
or Electrolytic capacitors
Current limit protection
Thermal Shutdown
-40° to 125° temperature range
C
C
Available in SOIC-8 package
Description
The PS22924 is a high performance, precision linear regulator
with very low dropout voltage and excellent transient response.
It is designed to operate with wide input voltage range of 1.7 –
12 Volts making it ideal for two step conversion. The device is
capable of supplying 2A of output current with a typical dropout
voltage of 350mV. The output Voltage is available in either fixed
or adjustable options. For fixed option, the internal resistor
network can be set in 100mV increment ranging from 0.5 to 5.0
volts.
The product includes an Enable pin for electrical on/off of the
regulator. Forcing the Enable pin to logic low shuts down the
LDO and reduces the supply current below 1µA. The PS22924
features fast transient response and low self output noise.
Connecting a capacitor form ByPass to GND further enhances
the PSRR and the output noise.
An open collector power good flag with 500µs delay is available
for systems requiring supply monitoring and sequencing of
other supplies. The regulator features the full suite of protection
with a combination of current limit and thermal overload
protection.
The
PS22924
is available in a thermally enhanced SOIC-8 EDP
packages, and it is rated for -40° to +125° junction
C
C
temperature range.
Applications
•
•
•
•
•
Set Top Boxes
Digital Audio systems
DSP
POL regulators
SMPS post regulator
Typical Application
Vin = 1.7 – 12v
Plessey Semiconductors Ltd, Tamerton Road, Roborough, Plymouth, UK PL6 7BQ
Data Sheet 292205 issue 1
Tel: +44 (0)1752 693000
Fax: +44 (0)1752 693200
Web:
www.plesseysemiconductors.com
email:
sales@plesseysemi.com;
October 12, 2010
1
PS22924
Pin Description
Pin
Number
1
2
3
4
5
6
7
8
Symbol
EN
ByPass
V
IN
NC
FB
V
OUT
PG
GND
Description
Enable pin. It controls the electrical on/off of the device. When connected to logic low, the
device shuts off and consumes 1µA of current. Logic high will resume normal operation.
Bypass pin. Connect an external capacitor from BYP to ground to bypass the noise generated by
the internal bandgap. This improves power supply rejection ratio and output noise. A minimum
capacitor of 220pF is recommended.
Input supply pin. Connect a 10µF capacitor between this pin and ground.
No connect.
Feedback Voltage. For preset Vout devices an on-chip resistor network of two resistors is used to
set-up the output voltage. In this case FB needs to be connected externally to Vout. For
adjustable Vout devices the centre of an external resistive chain needs to be connected to this FB
pin.
Regulated output Voltage. Connect a 10µF capacitor from this pin to ground.
Power good. It is an open collector, active high output that indicates the status of the output
voltage. When output voltage (V
OUT
) exceeds the PG trip threshold, the PG pin goes in to a high
impedance state. When the device is out of regulation or shutdown, the PG pin is pulled low. A
10K to 1M resistor should be connected from PG to V
OUT
.
Ground connection.
EDP
Expose pad. Connected to PCB ground plane for good thermal dissipation.
NB: N/A = Not available in the shown package type
Pin Configuration
SOIC-8 (Top View)
Plessey Semiconductors Ltd, Tamerton Road, Roborough, Plymouth, UK PL6 7BQ
Data Sheet 292205 issue 1
Tel: +44 (0)1752 693000
Fax: +44 (0)1752 693200
Web:
www.plesseysemiconductors.com
email: sales@plesseysemi.com; October 12, 2010
2
PS22924
Absolute Maximum Ratings
(1)
Maximum Input Supply Voltage………………........….… -0.8 to 15V
Enable Voltage………………………………………….... -0.8 to 15V
Power Good……………………………………………..... -0.8 to 15V
Feedback Voltage………………………………………...... -0.8 to 5V
ByPass Voltage……………………………………………. -0.8 to 5V
Enable input Voltage……………………….…………….. 0V to V
IN
Junction Operating Temperature………………..…… -40˚C to 125˚C
Thermal Information
(2)
SOIC-8
1
θ
JA
................................................................................36˚C/W
Storage Temperature Range……………......................... -65 to 150˚C
Lead Temperature…………………..………….……………… 260˚C
Junction Temperature……………………….…………... -40 to 125˚C
Recommended Operating Conditions
Input Voltage………………………………….………….. 1.7 to 12V
ELECTRICAL CHARACTERISTICS
Unless otherwise noted: V
IN
=5.0V; V
O
=3.3V; C
IN
=C
OUT
=22µF; -40˚C to T
J(MAX.)
= 125°C; Typical values are T
A
= 25°C
Parameter
Output Voltage Range
Output Voltage Tolerance
Feedback Voltage
Maximum Output Current
Shutdown current
Current Limit
Supply Current
Load Regulation
Line Regulation
Dropout Voltage
Enable Threshold Low
Enable Threshold High
Input Enable Low Current
Input Enable High Current
Ripple Rejection Ratio
V
DO
V
EN(L)
V
EN(H)
I
EN(L)
I
EN(H)
PSRR
V
EN
= 0V
V
EN
=2V
I
O
=50mA
BW; 10Hz – 100KHz
Io=100mA
C
OUT
= 10µF
I
PG
=200µA
500
140
15
Freq=100Hz
Freq=10KHz
C
BYP
= Open
C
BYP
=100nF
1.4
0.01
5.0
62
60
TBD
nV/√Hz
TBD
400
mV
µs
˚C
˚C
2.0
8.0
3
Symbol
V
O
Adjustable
Conditions
Fixed option; 100mV increment
Min.
0.5
0.5
Typ.
Max.
5.0
V
O
+V
DO
Units
V
%
TBD
V
FB
I
O
I
SHD
I
LIM
I
Q
V
EN
=GND
2.2
I
OUT
= 2A
I
OUT
= 0.1mA – 2A
V
IN
= Vo+1V to 12V; I
OUT
=10mA
I
OUT
= 1A
I
OUT
= 1.5A
I
OUT
= 2A
-1.0
-0.5
0.494
2
0.1
1.0
3.2
TBD
1.0
0.5
TBD
TBD
TBD
0.8
0.50
0.506
V
A
µA
A
mA
%
%
mV
V
V
µA
µA
dB
Output Noise
Power good low threshold
Power good delay
Thermal Shutdown
Thermal Shutdown Hys.
e
n
V
OL_PG
V
PG_delay
T
SD
T
SD_HYS
Notes:
1.
2.
3.
Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Measured on approximately
1” square of 1oz copper.
The PS22924 is guaranteed to meet performance specifications over the -40°C to +125°C junction operating temperature range and
is assured by design, characterization, and correlation with statistical process control.
Load regulation is measured using pulse techniques with duty cycle <5%.
Plessey Semiconductors Ltd, Tamerton Road, Roborough, Plymouth, UK PL6 7BQ
Data Sheet 292205 issue 1
Tel: +44 (0)1752 693000
Fax: +44 (0)1752 693200
Web:
www.plesseysemiconductors.com
email: sales@plesseysemi.com; October 12, 2010
3
PS22924
Typical Dropout voltage vs Iout(A)
Typical Line regulation vs Vin (V)
Plessey Semiconductors Ltd, Tamerton Road, Roborough, Plymouth, UK PL6 7BQ
Data Sheet 292205 issue 1
Tel: +44 (0)1752 693000
Fax: +44 (0)1752 693200
Web:
www.plesseysemiconductors.com
email: sales@plesseysemi.com; October 12, 2010
4
PS22924
Typical Load regulation vs Iout(A)
FUNCTIONAL BLOCK DIAGRAM
Plessey Semiconductors Ltd, Tamerton Road, Roborough, Plymouth, UK PL6 7BQ
Data Sheet 292205 issue 1
Tel: +44 (0)1752 693000
Fax: +44 (0)1752 693200
Web:
www.plesseysemiconductors.com
email: sales@plesseysemi.com; October 12, 2010
5
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