SPX2945 Datasheet, PDF (1/11 Pages) Sipex Corporation – 500mA Low Drop Out Voltage Regulator with Shutdown

®
SPX2945
400mA Low Dropout Voltage Regulator with Shutdown
FEATURES
■ Output 3.3V, 5.0V at 400mA Output
■ Very Low Quiescent Current, 100µA
■ Low Dropout Voltage, 420mV at 400mA
■ Extremely Tight Load and Line Regulation
■ Very Low Temperature Coefficient
■ Current & Thermal Limiting
■ Error Flag Warns Of Output Dropout
■ Logic-Controlled Electronic Shutdown
■ Output Programmable From 1.24V to 20V
(for SO-8)
+V_IN
100K
SHUTDOWN
INPUT
OFF
ON
8 _+VIN
1
V_OUT
SPX2945 FB ⁷
SD
3
______
ERROR
GND
5
4
1.2V to 20V
+
R₁ ^{0.01µF 10µF}
V_REF
R₂
ERROR
OUTPUT
Adjustable Regulator
V_IN
+
0.1 µF
IN
OUT
SPX2945
GND
5V
+
2.2 µF
5V Regulator Circuit
DESCRIPTION
The SPX2945 is a low power voltage regulator. This device is an excellent choice for use in battery-powered
applications such as cordless telephones, radio control systems, and portable computers. The SPX2945
features very low quiescent current (100µA Typ.) and very low dropout voltage. This includes a tight initial
tolerance of 1% max and very low output temperature coefficient, making the SPX2945 useful as a low-
power voltage reference.
The error flag output feature is used as power-on reset for warning of a low output voltage, due to a falling
voltage input of batteries. Another feature is the logic-compatible shutdown input which enables the
regulator to be switched on and off. The SPX2945 is offered in 3-pin TO-220 package, SO-8 (same pin
out as SPX2951), SOT-223, surface mount 3-Pin TO-252, 3-Pin TO-263 packages and 5-Pin TO-263.
The regulator output voltage (of the 8-pin SO-8) may be pin-strapped for a 3.3V and 5.0V or programmed
from 1.24V to 20V with an external pair of resistors. Look for SPX2951 for 150mA and SPX2954 for 250mA
applications.
TO-220-3 (U)
TO-263-3 (T)
TO-263-5 (T5)
TO-252 (R)
8-Pin Surface Mount(S)
SOT-223 (M3)
SPX2945
123
SPX2945
1 23
V_IN GN V_OU
SPX2945
5 Pin TO-263
1 2345
SPX2945
1 23
V_IN GN V_OU
VOU
SENS
SHUTDOWN
GN
1
8
SPX2945
2
7
3
6
4
5
V_IN
FEEDBACK
5V/ 3.3V TAP
ERRO
SPX2945
1 23
V_{IN GN} V_OU
V_IN GN V_OU
Rev. B Date:01/20/04
SPX2945 400mA Low Dropout Voltage Regulator with Shutdown
1
©Copyright 2004 Sipex Corporation