L4954_10 Datasheet, PDF (1/13 Pages) STMicroelectronics – Quad multifunction voltage regulator for car radio

L4954
Quad multifunction voltage regulator for car radio
Features
■ 4 regulators:
– 10 V (40 mA) low dropout
– 8.5 V (175 mA)
– 5 V (650 mA)
– 5 V (100 mA) standby
■ 3 high side drivers:
– 2 A (HSD1)
– 0.3 A (HSD2 & HSD3)
■ No external charge pump capacitors are
required
■ Standby mode controlled by 3 input pins:
– EN1 for REG1, REG2, REG3 and HSD1
– EN2 for HSD2
– EN3 for HSD3
■ Individual thermal shutdown
■ Logic outputs for supply undervoltage:
– LVWARN
– Reset
■ Independent current limiting
■ Overvoltage shutdown
■ Short circuit protection
■ Load dump protection and overvoltage
■ Shutdown
Multiwatt15
Description
L4954 is a quad output voltage regulator and a
three output high side driver.
The IC includes monitoring circuitry to warn the
microprocessor of a low voltage condition: the
LVWarn, output, sensing the slow dropping of
STCAP pins voltage, gives the microprocessor
time to store data.
A reset output is generated at REG4’s decay.
External protection must be provided for reverse
battery protection.
Table 1.
Device summary
Order code
L4954
Package
Multiwatt15
Packing
Tube
July 2010
Doc ID 17719 Rev 1
1/13
www.st.com
1