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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
Table 1. Device summary
L4954
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.
Order code Package Packing
L4954 Multiwatt15 Tube
July 2010 Doc ID 17719 Rev 1 1/13
www.st.com
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Contents L4954
Contents
1 Block and pins connection diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2/13 Doc ID 17719 Rev 1
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L4954 List of tables
List of tables
Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 2. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 3. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 4. Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 5. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Doc ID 17719 Rev 1 3/13
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List of figures L4954
List of figures
Figure 1. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2. Pins connection diagram (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 3. Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 4. Timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 5. Multiwatt15 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4/13 Doc ID 17719 Rev 1