SA57022-XX Datasheet, PDF (2/8 Pages) NXP Semiconductors – 500 mA LDO with ON/OFF control and Vref bypass

Philips Semiconductors
500 mA LDO with ON/OFF control and V_ref bypass
Product data
SA57022-XX
GENERAL DESCRIPTION
The SA57022-XX has an extremely precise fixed output with a
typical accuracy of ±2%. It is designed to provide very low dropout
and ultra low noise with an optional Bypass pin, and fast transient
response. Supply current is reduced to zero (typical).
The SA57022-XX incorporates both over-temperature and
over-current protection. The SA57022-XX is stable with an output
capacitor of only 1.0 µF and has a maximum output current of
500 mA. It is available in the 7-pin small outline package (SOP002).
FEATURES
• Very low dropout voltage: 300 mV typ. (I_out = 500 mA)
• High precision output voltage: ±2%
• Output current capacity: 500 mA
• Low noise: 75 µV_rms typ. @ 20 Hz to 80 KHz, for C_n = 470 pF.
• Extremely good line regulation: 10 mV typical
• Extremely good load regulation: 20 mV typical
• Low temperature drift co-efficient to V_out: ±100 ppm/°C
• Internal current limit and thermal shut-down circuits
• Input voltage range: –0.3 V to 12 V
• Wide preset output voltage range: 1.8 V to 5 V
• Wide operating temperature range: –40 °C to +85 °C
SIMPLIFIED SYSTEM DIAGRAM
APPLICATIONS
• Battery-operated systems
• Portable computers
• Cameras, VCRs and camcorders
• PCMCIA cards, modems, pagers
• Cellular/GSM/PHS phones
• Linear post-regulator for SMPS
• Instrumentation
V_{IN 7}
5
ON/OFF
GND 3
BIAS
DRIVER
CURRENT
LIMIT
THERMAL
SHUTDOWN
1 V_OUT
REFERENCE
R
R
4
BYPASS
Figure 1. Simplified system diagram.
SL01527
2003 Oct 13
2