www.fairchildsemi.com
ILC7280
Micropower Dual 150mA CMOS RF LDO™
Regulators
Features
Low Power Consumption
150mV Dropout at 150mA
1% Output Voltage Accuracy
Requires only 0.47µF Output Capacitor
Only 135µA Ground Current at 150mA load
50µV
RMS
Noise at BW = 300Hz to 50kHz
Excellent Line and Load Transient Response
Over Current/Over Temperature Protection
8-pin MSOP package
Voltage Options Available: 3.3/3.3V, 3.0/3.0V, 3.0/2.8V,
3.0/2.5V, 2.8/2.8V, 2.85/2.85V. Other Custom Values
available upon request.
• Minimum External Components
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General Description
The ILC7280 is two independent 150mA low dropout
(LDO)voltage regulators in an 8-pin MSOP package. Each
regulator output is independently short circuit protected and
has independent enable lines. The device offers a unique
combination of low dropout voltage and low quiescent
current offered by CMOS technology as well as the low
noise and good ripple rejection characteristics of bipolar
LDO regulators.
The ILC7280 is available in a space saving MSOP-8
package.
Applications
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Cellular Phones, pagers and wireless headsets
Palmtops, organizers, PDAs and portable electronics
Battery powered portable appliances and equipment
Remote data accumulation and instrumentation
Block Diagram
V
INA
V
OUTA
–
+
EN
A
Current Limit
Thermal Shutdown
*C
NOISE
Bandgap
Reference
GND
Current Limit
Thermal Shutdown
EN
B
+
V
INB
*Optional
–
V
OUTB
REV. 1.0.5 6/3/02
ILC7280
PRODUCT SPECIFICATION
Pin Configuration
V
OUTA
GND
V
OUTB
C
NOISE
(Optional)
1
2
3
4
8
7
6
5
V
INA
EN
A
V
INB
EN
B
MSOP-8
Pin Definitions
Pin Number
1
2
3
4
5
6
7
8
Pin Name
V
OUTA
GND
V
OUTB
C
NOISE
EN
A
V
INB
EN
B
V
INA
Ground of the IC
Output B.Regulated voltage
Optional bypass for noise reduction.
Digital Input Enable for regulator A
Supply input B.Internally connected to pin 8*
Digital Input Enable for regulator B
Supply input B.Internally connected to pin 6*
Pin Function Description
Output A.Regulated voltage
*If maximum current is required from each regulator, then connect both pin 6 and 8 to power supply.
Absolute Maximum Ratings
Absolute maximum ratings are the values beyond which the device may be damaged or have its useful life
impaired. Functional operation under these conditions is not implied.
Parameter
Supply Voltage: V
INA
or V
INB
to GND
Voltage on all other pin to GND
Junction Temperature
Storage Temperature
Lead Soldering Temperature, 10 seconds
Power Dissipation at 85°C
–0.3
–
65
–
65
Min.
Max.
10
V
IN
+ 0.3
150
150
300
315
Units
V
V
°C
°C
°C
mW
Recommended Operating Conditions
Parameter
Supply Voltage V
DD
Output Current
Ambient Operating Temperature
Conditions
V
INA
or V
INB
to GND
I
OUT
-40
Min.
V
OUT
+ V
DO
Typ.
V
OUT
+ 1V
Max.
9
150
85
Units
V
mA
°
C
2
REV. 1.0.5 6/3/02
PRODUCT SPECIFICATION
ILC7280
Electrical Specifications
(All values are for each regulator at V
IN
=V
OUTnom
+1V, I
OUT
=1mA, C
OUT
=0.47µF, C
N
=0, V
EN
=2V and T
A
= +25°C
using Test circuit in Figure 1, unless otherwise noted.)
Parameter
Output Voltage
Dropout Voltage
Line Regulation
Load Regulation
Ground Pin Current
One Regulator ON
I
OUT
= 10mA
I
OUT
= 150mA
V
OUT
+ 1V
≤
V
IN
≤
V
OUT
+ 2V
I
OUT
: 1mA to 150mA
I
OUT
= 0mA
I
OUT
= 10mA
I
OUT
= 150mA
Ground Pin Current
Both Regulators ON
I
OUT
= 0mA
I
OUT
= 10mA
I
OUT
= 150mA
OFF State Current
Enable Input Current
Shut Down Input Voltage
Output Voltage Noise
Ripple Rejection
Dynamic Line Regulation
V
EN
= 0V
V
OUT
= 2V
V
OUT
= 0.6
High = Regulator ON
Low = Regulator OFF
C
OUT
= 2.2µF, C
N
=1nF,
I
OUT
= 10mA, BW = 300Hz to 50kHz
C
OUT
= 4.7µF, f = 120Hz
C
OUT
= 4.7µF, f = 1KHz
V
IN
: V
OUT
+ 1V to V
OUT
+ 2V
dV/dt = 1V/µS
50
50
45
20
10
mV
mV
2
0.6
µ
Vrms
dB
Conditions
Min.
0.99
V
OUTnom
5.5
155
0.2
0.3
80
85
95
120
125
135
150
4
0.2
220
10
0.5
V
nA
µ
A
Typ.
V
OUTnom
Max.
1.01
V
OUTnom
7
180
0.5
0.75
105
110
125
µ
A
%/V
%
µ
A
mV
Units
V
Dynamic Load Regulation I
OUT
: 0 to 150mA
DI/dt = 1A/µS
V
OUTA
C
OUT
V
INA
EN
A
V
OUTB
C
OUT
C
N
Figure 1. Test Circuit
V
INB
C
IN
EN
B
V
IN
REV. 1.0.5 6/3/02
3
ILC7280
PRODUCT SPECIFICATION
Typical Applications Diagrams
Power Spectral Density and Output Noise Voltage
Thermal Protection Under Short Circuit Conditions
C
OUT
=2.2µF
C
NOISE
=1nF
Load=10mA
BW=300Hz to 50kHz
Isc(0.5A/div)
ON/OFF Response, One Regulator ON
ON/OFF Response, Both Regulators ON
V
EN
V
OUT
@ 10mA load,
C
OUT
=2.2µF, CN=1nF
V
OUT
@
100mA load
C
OUT
=2.2µF
CN=0
V
EN
Ripple Rejection, Low Frequencies
Ripple Rejection, High Frequencies
C
OUT
=4.7µF
Load=10mA
C
OUT
=4.7µF
Load=10mA
4
REV. 1.0.5 6/3/02
PRODUCT SPECIFICATION
ILC7280
Ripple Rejection, Low Frequencies, 150mA Load
Ripple Rejection, High Frequencies, 150mA Load
Line Transient Response, 10mA Load
Load Transient Response
V
IN
V
OUT(AC)
I
LOAD
(0.1A/div)
V
OUT(AC)
Ground Pin Current, Both Regulators ON
350
300
250
200
150
100
50
0
Ground Current (µA)
V
OUTnom
150mA load
no load
0
1
2
3
4
5
6
7
8
9
10
Input Voltage (V)
REV. 1.0.5 6/3/02
5
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