ST L4954 User Manual

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

1

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

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

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