SPX3940

Features:

• Output Accuracy 3.3V, @ 1A Output
• Very Low Quiescent Current
• Low Dropout Voltage
• Extremely Tight Load And Line Regulation
• Very Low Temperature Coefficient
• Current & Thermal Limiting
• Error Flag Warns Of Output Dropout




Application

• Battery Powered Systems
• Cordless Telephones
• Radio Control Systems
• Portable/Palm Top/Notebook Computers
• Portable Consumer Equipment
• Portable Instrumentation
• Automotive Electronics
• SMPS Post-Regulator
• Voltage Reference




Specifications

Specifications
Iout(mA)	1000
Vin MIN. (V)	3.1
Vin MAX. (V)	16
IQ (A)	18000
Acc	2% (Non-A version);1% (A version)
Vdrop (mV)	280
Vout1.2V
Vout1.5V	No
Vout1.8V	Yes
Vout2.0V	No
Vout2.5V	Yes
Vout2.7V	No
Vout2.85V	No
Vout2.8V	No
Vout3.0V	No
Vout3.3V	Yes
Vout3.5V	No
Vout5.0V	Yes
VoutAdj.	No

Power Dissipation......................................Internally Limited
Input Supply Voltage ..................................................+7.5V
Lead Temp. (Soldering, 5 Seconds) ..........................260°C
Feedback Input Voltage ..................................1.5V to +30V
Storage Temperature Range .....................-65° to +150°C
Shutdown Input Voltage..................................-0.3V to +30V
Operating Junction Temperature Range (Note 9)
Error Comparator Output ................................-0.3V to +30V
SPX3940/41/42..................................-40C° to +125°C
ESD Rating ................................................................2KV Min




Description

The SPX3940/41/42 is a low power voltage regulator. This device is an excellent choice for battery-powered applications such as cordless telephones, radio control systems and portable computers. The SPX3940/41/42 features very low quiescent current (100µA Typ.) and very low dropout voltage. This includes a tight initial tolerance of 1% max and 2% max., and very low output temperature coefficient, making the SPX3940/41/42 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 SPX3940/41/42 is offered in 3-pin and 5-pin TO-220 package SOT-223, and surface mount TO-263 packages.

The regulator output voltage of SPX3940 (of the 8-pin SO-8 and 5-pin TO-220 & TO-263) may be pin-strapped for a 3.3V or programmed from 1.24V to 29V with an external pair of resistors.