Impala Linear Corporation
ILC7281
Advance
Micropower Dual 150mA CMOS RF LDO™ Regulators
with Power Supply Reset Monitor
General Description
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
IMPALA [ Impala Linear Corporation ]
