ILC7281 Datasheet, PDF (1/9 Pages) Impala Linear Corporation – MICROPOWER DUAL 150MA CMOS RF LDO REGULATORS WITH POWER SUPPLY RESET MONITOR

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.
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
• 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
+
V_OUTB
0.47-2.2µF
ceramic
+
C_NOISE
+
470pF
1µF
ceramic
EN_B
10K
GND
EN_A
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
[phone] www.impalalinear.com
Nov 2000 1