SA57026 Datasheet, PDF (2/8 Pages) NXP Semiconductors – 300 mA LDO with ON/OFF control and independent delayed RESET function

Philips Semiconductors
300 mA LDO with ON/OFF control and
independent delayed RESET function
Product data
SA57026
GENERAL DESCRIPTION
The SA57026 has an extremely precise fixed output with a typical
accuracy of ±2%. It is designed to provide very low dropout and low
noise in CD-ROM drives, battery-operated systems, and portable
computers applications. This regulator consists of an internal
voltage reference, an error amplifier, a driver with current limiter, and
a thermal shut-down mechanism.
An Active-LOW RESET is assered when the detected voltage
(V_DET) falls below the reset voltage threshold. The RESET output
remains low for 30 µs (typical) when zero capacitance connected to
Cd pin. The reset time delay can be adjusted by replacing
cpacitance values from Cd pin to Ground.
The device is available in the 7-pin small outline package (SOP002).
FEATURES
• Very low dropout voltage: 500 mV typ. (I_out = 50 mA)
• High precision output voltage: ±2%
• Output current capacity: 300 mA
• Low noise: 40 mV_rms typ. @ 20 Hz to 80 KHz and for C_n = 10 nF
• 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
• Adjustment-free reset detection voltage: 4.2 V typ.
• Delay time can be adjusted by external capacitor
• Wide operating temperature range: –40 °C to +85 °C
BLOCK DIAGRAM
APPLICATIONS
• CD-ROM drives
• Electronic notebooks, PDAs and palmtop computers
• Cameras, VCRs and camcorders
• PCMCIA cards
• Modems
• Battery-operated or hand-held instruments
4 V_IN
ON/OFF
3
THERMAL
PROTECT
2003 Oct 13
Figure 1. Block diagram.
2
5 V_OUT
2 RESET
1 GND
7 Cd
SL01528