The ILC7281 provides two independant 150mA low dropout
(LDO) voltage regulators and power supply reset monitor in
an 8-pin MSOP package. Each regulator output is inde-
pendantly short circuit protected and has independant shut-
down. The device offers a unique combination of low
dropout voltage and low quiescent current of CMOS and
low noise and high ripple rejection characteristics of bipolar
LDO regulators. Moreover, only one input capacitor is
required. The power supply reset monitor is available in a
±1% accurate trip voltage to fit most microprocessor appli-
cations. Even though its output can sink 2mA, the monitor
draws only 1µA in normal operation. Additionally, a built-in
hysteresis of 5% of detect voltage simplifies system design.
Dropout Voltage:
Typically 150mV at 150mA load, and
1mV at 1mA load.
Ground pin current:
Typically 20µA at 1mA load, and
30µA at 150mA load.
Ripple rejection:
75dB at 1kHz and 60dB at 100kHz.
Shutdown mode:
Less than 0.5µA quiescent current in
shutdown mode.
Small package:
8-pin MSOP.
Small capacitor:
Requires only a 0.47µF external cpacitor
on the regulator output.
Precision output:
Output voltage trimmed to 1% accuracy.
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Features
Guaranteed 150mA output per regulator
Ultra low 150mV dropout at 150mA
1% output voltage accuracy
Built-in hysteresis of 5% of detection voltage
Requires only 0.47µF output capacitor
Only 30µA ground current at 150mA load
75dB ripple rejection at 1kHz (C
OUT
= 0.47µF)
80µV
RMS
noise at BW = 300Hz to 50kHz
Excellent line and load transient rsponse
Over current / over temperature protection
8-pin MSOP package
-80dB cross talk
Applications
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Cellular Phones, pagers and wireless headsets
Microprocessor reset circuits
Palmtops, oragnizers, PDA’s and portable electronics
Microprocessor reset circuits
Battery powered portable appliances
Memory battery back-up circuitry
Ordering Information* (T
A
= -40°C to +85°C)
ILC7281CS-2530
150mA 2.5V and 3.0V LDO regulators with
2.7V detect fail voltage (V
DF
) Monitor
Figure 1
V
IN
10K
V
OUTB
0.47-2.2µF
+
C
NOISE
ceramic
470pF
+
1µF
ceramic
EN
B
EN
A
GND
V
OUT
RESET
+
V
OUTA
+
0.47-2.2µF
ceramic
Note: Enable may be connected to V
IN
, C
NOISE
connects to both LDO’s
Impala Linear Corporation
ILC7281 1.0
(408) 574-3939
www.impalalinear.com
Nov 2000
1
Micropower Dual 150mA CMOS RF-LDO™ Regulators with Power Supply Reset Monitor
Advance
Pin-Package Configurations
Figure 2
V
IN
V
OUTB
C
NOISE(optional)
EN
B
1
2
3
4
8
7
6
5
V
OUT RESET
GND
V
OUTA
EN
A
MSOP
(TOP VIEW)
ILC7281CS-XXXX
Pin Functions ILC7281
Pin Number
1
2
3
4
5
6
7
8
Pin Name
V
IN
V
OUTB
C
NOISE(optional)
Pin Description
Supply Input
Regulator Output B
Voltage Reference Bypass: Connect external 470pF capacitor to GND to
reduce output noise in regulator “A” or “B.” May be left open.
Enable/Shutdown B (Input): CMOS compatible input. Logic high = enable,
logic low or open = shutdown. Do not leave floating.
Enable/Shutdown A (Input): CMOS compatible input. Logic high = enable,
logic low or open = shutdown. Do not leave floating.
Regulator Output A
Ground
Power supply reset monitor output. N-CH open drain output, must connect
through a resistor to supply voltage.
EN
B
EN
A
V
OUTA
GND
V
OUT RESET
Impala Linear Corporation
ILC7281 1.0
(408) 574-3939
www.impalalinear.com
Nov 2000
2
Micropower Dual 150mA CMOS RF-LDO™ Regulators with Power Supply Reset Monitor
Advance
Absolute Maximum Ratings for Regulators (Note 1)
Parameter
Input Voltage
S/D Input Voltage
Output Current
Output Voltage
Power Dissipation
Maximum Junction Temp Range
Storage Temperature
ESD Rating
Operating Input Voltage
Operating Ambient Temperature
Package Thermal Resistance
V
IN
T
A
θ
JA
Symbol
V
IN
V
S/D
I
OUT
V
OUT
P
d
T
J(max)
T
stg
Ratings
-0.3 to +12
-0.3 to V
IN
Short circuit protected
-0.3 to 10
Internally Limited
-40~+125
-40~+125
2
2.1 to 10
-40 to +85
200
Units
V
mA
V
mW
°C
°C
kV
V
°C
°C/W
Electrical Characteristics ILC7281CS
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
Output Voltage
Output Voltage
Output Voltage
Line Regulation
Dropout Voltage
(Note 3)
Dropout Voltage
(Note 3)
Dropout Voltage
(Note 3)
Ground Pin Current
Ground Pin Current
Ground Pin Current
Shutdown Current
Symbol
V
OUT
V
OUT
V
OUT
∆V
O
/∆V
IN
V
IN
- V
OUT
V
IN
- V
OUT
V
IN
- V
OUT
I
GND
I
GND
I
GND
I
S/D
(408) 574-3939
www.impalalinear.com
Conditions
I
OUT
= 1mA
1mA < I
OUT
< 100mA
1mA < I
OUT
< 100mA
1mA < I
OUT
< 150mA
1mA < I
OUT
< 150mA
V
O(NOM)
+ 1V < V
IN
< 10V
I
OUT
= 0mA
I
OUT
= 10mA
I
OUT
=150mA
I
OUT
= 0mA
I
OUT
= 10mA
I
OUT
= 150mA
Min
-1
-1.5
-2.5
-2.5
-3.5
Typ
V
OUT
(Nom.)
V
OUT
(Nom.)
V
OUT
(Nom.)
0.007
0.1
10
150
20
25
30
0.1
Max
+1
+1.5
+2.5
2.5
+3.5
0.014
0.032
1
2
15
20
175
200
60
80
70
90
80
120
1
Units
%V
(Nom.)
%V
(Nom.)
%V
(Nom.)
%/V
mV
mV
mV
µA
µA
µA
µA
Impala Linear Corporation
ILC7281 1.0
Nov 2000
3
Micropower Dual 150mA CMOS RF-LDO™ Regulators with Power Supply Reset Monitor
Advance
Electrical Characteristics ILC7281CS
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
Shutdown 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
Min
2.0
300
500
80
75
70
60
10
40
20
300
-60
mV
dB
Typ
Max
10
0.6
mA
µV
RMS
Units
V
Dynamic Line Regulation
Dynamic Load Regulation
Short Circuit Current
Cross Talk
mV
mA
dB
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 input to output differential voltage at which the output voltage drops 2% below the nominal value measured with a 1V differential.
Note 4:
Guaranteed by design
Impala Linear Corporation
ILC7281 1.0
(408) 574-3939
www.impalalinear.com
Nov 2000
4
Micropower Dual 150mA CMOS RF-LDO™ Regulators with Power Supply Reset Monitor
Advance
Absolute Maximum Ratings Supply Reset Monitor (T
A
= 25°C)
Parameter
Input Voltage
Output Current
Output Voltage
Continuous Total
Power Dissipation (SOT-23)
Operating Ambient Temperature
Storage Temperature
Symbol
V
IN
I
OUT
V
OUT
P
d
T
opr
T
stg
Ratings
12
50
V
SS
-0.3~V
IN
+0.3
150
-30~+80
-40~+125
Units
V
mA
V
mW
°C
°C
Electrical Characteristics
Power Supply Reset Monitor (T
A
= 25°C)
Paramter
Detect Fail Voltage
Hysteresis Range
Symbol
V
DF
V
HYS
V
IN
V
IN
V
IN
V
IN
V
IN
=
=
=
=
=
1.5V
2.0V
3.0V
4.0V
5.0V
Conditions
A grade
Min
V
DF
X 0.99
Typ
V
DF
0.9
1.0
1.3
1.6
2.0
Max
V
DF
X 1.01
2.6
3.0
3.4
3.8
4.2
10.0
Units
V
V
V
DF
X 0.02 V
DF
X 0.05 V
DF
X 0.08
Supply Current
I
SS
1.5
µA
Operating Voltage
V
IN
V
DF
= 2.1~6.0V
N-ch V
DS
= 0.5V
V
IN
= 1.0V
V
IN
= 2.0V
V
IN
= 3.0V
V
IN
= 4.0V
V
IN
= 5.0V
2.2
7.7
10.1
11.5
13.0
±100
V
Output Current
I
OUT
mA
Temperature Characteristics
Delay Time (Release Voltage
Output Inversion)
∆V
DF
/(∆T
opr
•V
DF
) -30°C < T
opr
< 80°C
t
DLY
(V
DR
V
OUT
Inversion)
ppm/°C
0.2
ms
Note:
1. An additional resistor between the V
IN
pin and supply voltage may cause deterioration of the characteristics due to increasing of V
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