Impala Linear Corporation
ILC7280
Advance
Micropower Dual 150mA CMOS RF LDO™ Regulators
with 75dB Ripple Rejection
General Description
The ILC7280 is two independent 150mA low dropout (LDO)
voltage regulators in an 8-pin MSOP package. Each regu-
lator output is independently short circuit protected and has
independent enable lines. The device offers a unique com-
bination of low dropout voltage and low quiescent current of
CMOS as well as the low noise and high ripple rejection
characteristics of bipolar LDO regulators. Moreover, only
one input capacitor is required.
Dropout Voltage:
Typically 150mV at 150mA load, and
1mV at 1mA load.
Ground pin current:
Typically 130µA at 1mA load, and
135µA at 150mA load.
Ripple Rejection:
55dB at 1kHz and 60dB at 100kHz.
Shutdown mode:
Less than 0.5µA quiescent current in
shutdown mode.
Small package:
MSOP-8
Small capacitor:
Requires only a 0.47µF external capacitor
on the regulator output.
Precision output:
Output voltage trimmed to 1% accuracy.
Output Noise:
80µV
RMS
, optional noise bypass capacitor
at pin 3 will further reduce noise on V
OUTA/B
Voltage Pairings available:
3.0/3.0V, 3.0/2.8V, 3.0/2.5V,
2.8/2.8V
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Features
Guaranteed 150mA output per regulator
Ultra low 150mV dropout at 150mA
1% output voltage accuracy
Requires only 0.47µF output capacitor
Only 150µA ground current at 150mA load
60dB ripple rejection at 1kHz (C
OUT
= 0.47µF)
80µV
RMS
noise at BW = 300Hz to 50kHz
Excellent line and load transient response
Over current / over temperature protection
8-pin MSOP package
-60dB cross talk
Applications
Cellular Phones, pagers and wireless headsets
Palmtops, organizers, PDAs and portable electronics
Battery powered portable appliances and equipment
Remote data accumulation and instrumentation
Ordering Information* (T
A
= -40°C to +85°C)
ILC7280CS-2530
ILC7280CS-3028
ILC7280CS-2828
ILC7280CS-3030
ILC7280CS-3025
150mA 2.5V and 3.0V LDO regulators
150mA 3.0V and 2.8V LDO regulators
150mA 2.8V and 2.8V LDO regulators
150mA 3.0V and 3.0V LDO regulators
150mA 3.0V and 2.5V LDO regulators
Figure 1: Typical Application
Note: Enable may be connected to V
IN
,
C
NOISE
is common to both LDOs
V
OUTA
0.47-2.2µF
ceramic
V
OUTB
0.47-2.2µF +
ceramic
C
NOISE
22pF
(optional)
V
INA
+
GND
+
EN
A
V
INB
+
EN
B
1µF
ceramic
4.7µF
Impala Linear Corporation
ILC7280 1.8
(408) 574-3939
www.impalalinear.com
May 2000
1
Micropower dual 150mA CMOS RF LDO™ Regulators with 75dB Ripple Rejection
Advance
Pin-Package Configurations
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
(TOP VIEW)
ILC7280CS-XXXX
Pin Functions ILC7280
Pin Number
1
2
3
4
Pin Name
V
OUTA
GND
V
OUTB
Regulator Output A
Ground
Regulator Output B
Pin Description
C
NOISE (optional)
Voltage Reference Bypass: Connect external 22pF capacitor to GND to minimize
output noise in regulator “A” or “B.” May be left open. Do not ground.
EN
B
V
INB
EN
A
V
INA
Enable/Shutdown B (input): CMOS compatible input. Logic high = enable, logic low or
open = shutdown. Do not leave floating.
Supply Input B (Internally connected to pin 8)
*
Enable/Shutdown A (Input): CMOS compatible input. Logic high = enable, logic low or
open = shutdown. Do not leave floating.
Supply Input A (Internally connected to pin 6)
*
Galvanic connection only.
5
6
7
8
*
If maximum current required from each regulator then connect both pin 6 and pin 8 to V
DD
Impala Linear Corporation
ILC7280 1.8
(408) 574-3939
www.impalalinear.com
May 2000
2
Micropower Dual 150mA CMOS RF LDO™ Regulators with 75dB Ripple Rejection
Advance
Electrical Characteristics ILC7280CS
Unless otherwise specified, all limits are at T
A
= 25°C; V
IN
= V
O(NOM)
+ 1V, I
OUT
= 1mA, C
OUT
= 0.47µF, V
S/D
= 2V.
Boldface
limits apply over the operating temperature range.
(Note 2)
Parameter
Shut Down Input Voltage
Peak Output Current
(Note 4)
Output Noise Voltage (RMS)
Ripple Rejection
Symbol
V
S/D
I
O(peak)
e
N
∆V
O
/∆V
IN
∆V
O(line)
∆V
O(load)
I
SC
Conditions
High = Regulator On
Low = Regulator Off
V
OUT
> 0.95V
O(NOM)
BW = 300Hz to 50kHz, C
NOISE
= 0pF
freq = 1kHz
freq = 10kHz
freq = 100kHz
V
IN
: V
O(NOM)
+ 1V to V
O(NOM)
+ 2V; dV
IN/dt
=
1V/
µS;lo
= 150mA
I
OUT
: 0 to 150mA; d(l
OUT
)/dt = 50A/µs, with
C
OUT
= 2.2µF
V
OUT
= 0V
60
60
60
10
40
20
300
mA
mV
Min
2.0
300
500
Typ
Max
10
0.6
mA
µV
dB
Units
V
Dynamic Line Regulation
Dynamic Load Regulation
Short Circuit Current
mV
Note1:
Absolute maximum ratings indicate limits which when exceeded may result in damage to the component. Electrical specifications do not apply
when operating the device outside of its rated operating conditions.
Note 2:
Specified Min/Max limits are production tested or guaranteed through correlation based on statistical control methods. Measurements are
taken at constant junction temperature as close to ambient as possible using low duty pulse testing.
Note 3:
Dropout Voltage is defined as the measured Differential Voltage between input and output voltage, when the output voltage drops 2% below the nominal output
voltage as V
IN
is decreased, and approaches V
OUT
. Nominal output voltage is defined at V
IN
= V
OUT
+ 1V.
Note 4:
Guaranteed by design
Impala Linear Corporation
ILC7280 1.8
(408) 574-3939
www.impalalinear.com
May 2000
5
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