ST L5955 User Manual

Multiple multifunction voltage regulator for car radio

Features

■ 2 stand-by regulators:

3.3V (125mA)

1.5V (300mA)

■ 6 regulators:

10V (40mA)

8.5V (200mA)

3.3V (850mA) 8/10V (1A) 5/3.3/1.8V (200mA)

1.8/2.5V(200mA)

■ All regulators are low dropout outputs

■ The different outputs voltage are controlled by

2

I

C Bus.

■ Reg3 on/off controlled by enable

■ Reg1, Reg2, Reg4, Reg5, Reg6 on/off

controlled by I

■ 3 high side drivers:

2A (HSD1)

0.45A (HSD2 & HSD3)

■ No external charge pump capacitors are

required

■ Stand-by mode controlled by EN pin for I

Bus and Reg1, Reg2, Reg3, Reg4, Reg5, Reg6, HSD1, HSD2, HSD3

■ LVW function externally selectable

■ Individual thermal shutdown

Table 1. Device summary

2

CBus.

2

C

L5955

Flexiwatt27

■ Independent current limiting

■ Short circuit protection

■ Load dump protection and overvoltage

shutdown

Description

The L5955 is an integration of three high side drivers, six regulators and two stand-by regulators with RESET function developed to provide the power to a complete audio system.

The outputs of the IC are controlled by I and Enable pin.

The device is equipped with sequencing and slew rate controls for the st-by regulators.

2

C bus

Order code Package Packing

L5955 Flexiwatt27 Tube

August 2007 Rev 1 1/17

www.st.com

17

Contents L5955

Contents

1 Block and pin connection diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Electrical specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.1 Write mode: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3.2 Chip address byte: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3.3 Data byte: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2/17

L5955 Block and pin connection diagrams

8

1 Block and pin connection diagrams

Figure 1. Block diagram

VBAT1

BANDGAP

VBG

CSLEW

VBAT3_1/2

MRST*

MRSTDLY

Standby Regulators

POR Logic

Vstby1

Vstby2

SDA

SCL

I2C Interface

EN

LVWIN LVW*

HSD1

HSD2

HSD3

VBAT2

Low Voltage

Warning

High Side

Driver

High Side

Driver

High Side

Driver

VBAT1

VBGVBG

Figure 2. Pin connection (top view)

Vstby1

CSLEW

And

Sequencing

27

26

25

24

23

22

21

20

19

18

17

16

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

Vstby2

BG1

BG2

ST-By REG 3.3V

St_By REG 1.5V

10V Linear

Regulator

8.5V Linear Regulator

3.3V Linear Regulator

8V Linear Regulator

10V selectable

5V Linear Regulator

1.8-3.3V selectable

1.8V Linear Regulator

2.5V selectable

VSTBY1

VSTBY2

REG1

REG2

REG3

REG4

REG5

REG6

GND

PGND

TAB2

REG4

V

BAT3_2

REG3

V

BAT2

REG6

SCL

STBY2

V

BAT1

STBY1

MRST

REG5

MRSTDLY

GND

LVW

REG1

LVW_IN

REG2

Cslew

HSD3

EN

HSD2

V

BAT3_1

HSD1

PGND

SDA

TAB1

D04AU154

3/17

Electrical specification L5955

2 Electrical specification

2.1 Absolute maximum ratings

Table 2. Absolute maximum ratings

Symbol Parameter Value Unit

VS1, VS2,

VS3_1,

VS3_2

VS1, VS2,

VS3_1,

VS3_2

V

S1,2,3_1,3

_2,ovs

V

T

DC operating supply voltage 0.6 to 26.5 V

Transient supply over voltages, rise time = 10ms

delay time = 115ms

34 V

Overvoltage shutdown 27 V

Input voltages (EN, SDA, SCL, LVW, MRST, MRSTDLY,

in

CSLEW)

Output control voltage -0.6 to 18 V

out

Operating temperature range -40 to 85 °C

op

Storage temperature range -40 to 150 °C

stg

-0.6 to 5.5 V

2.2 Thermal data

Table 3. Thermal data

Symbol Parameter Value Unit

R

th j-case

Thermal resistance junction to case 1 °C/W

4/17

L5955 Electrical specification

2.3 Electrical characteristics

Table 4.

Electrical characteristics

(Refer to the application circuit, V

0.5mA, I

REG1

= I

REG2

= I

REG3

= I

bat

REG4

=V

bat1+Vbat2+Vbat3

= I

REG5

= I

REG6

= 14V, I

= 5mA, R

ST-BY1

HSD1

= 0.5mA, I

= R

HSD2

= R

ST-BY2

HSD3

= 16Ω)

Symbol Parameter Test condition Min. Typ. Max. Unit

= 14V, EN = 0.

V

I

qST-BY

Stand-by quiescent current

bat

= Istby2=100uA,

I

ST-BY1

170 μA

IQ(Vbat)=Ivbat1+Ivabt2+Ivbat3

V

= 14V, EN=VSTBY1

bat

Istby1=125mA Istby2=300mA

= 40mA

I

REG1

I

V V

V

L MRST

Maximum quiescent current

I

q

Enable input current V

EN

IL

Enable threshold voltage V

IH

= 200mA, I

REG2

I

= 1A, I

REG4

I

REG6

I

HSD2,3

= 14V; 5V<Enable ≥ 0V; 10

bat

= 14V;

bat

V

ST-BY1

V

ST-BY2

REG5

= 200mA, I

= 450mA

= 0.5V to VTH (ST-BY1) = 0.5V to VTH (ST-BY2)

Rising

= 850mA

REG3

= 250mA

= 2A

HSD1

100 mA

2

0 0

0.8

0.4

MRST output voltage

V

H MRST

V V Falling

= VTH (ST-BY1) to 0.5V

ST-BY1

= VTH (ST-BY2) to 0.5V

ST-BY2

0 0

0.4

=

μA

V V

V

TH MRST

t

d MRST

t

por MRST

t

f MRST

I

SCR MRST

I

LKG

MRSTDLY

V

sat

MRSTDLY

V

TH

I

LKG

V

OH

MRST output voltage threshold

Force V

ST-BY1

& V

ST-BY2

Low until MRST asserted

V

ST-BY2

· 0.93

V

ST-BY1

· 0.93

V

ST-BY2

· 0.97

V

ST-BY1

· 0.97

V

MRST delay time see Figure 4 13 μs

Power on reset delay time

MRST fall time

CMRSTLY = 220nF see Figure 4

R

= 47kΩ, C

RST

see Figure 4

= 50pF

20 ms

1 μs

MRSTDLY current MRSTDLY = 0 6 12 μA

MRSTDLY leakage current

MRSTDLY saturation voltage I

MRSTDLY = 5V

MRSTDLY

=0.5mA 0 0.4 V

6 μA

LVWIN input voltage threshold 1.25 V (nominal) 1.22 1.28 V

lvwin input leakage current 2 µA

V

LVW output voltage IOH=-100µA

STBY1

-0.2

V

STBY1

V

5/17

Electrical specification L5955

Table 4.

Electrical characteristics

(continued)

(Refer to the application circuit, V

0.5mA, I

REG1

= I

REG2

= I

REG3

= I

bat

REG4

=V

bat1+Vbat2+Vbat3

= I

REG5

= I

REG6

= 14V, I

= 5mA, R

ST-BY1

HSD1

= 0.5mA, I

= R

HSD2

= R

ST-BY2

HSD3

= 16Ω)

Symbol Parameter Test condition Min. Typ. Max. Unit

V

T

S HYS

3.3V/125mA V

V

ST-BY1

ΔV

LVW output voltage IOL = 100µA 0 0.2 V

OL

HSDS, REGS, V

Thermal shutdown for HSDS,

T

S

R

EGS, V

ST-BY1

, V

ST-BY2

min. load. Increase T

REGS, V

until HSDS,

amb

ST-BY1,2

HSDS, REGS, V

Thermal shutdown hysteresis for HSDS, REGS, V

I

CSLEW output current 7 14 µA

o

ST-BY1, ST-BY2. minimum turn

t

on

on time

ST-BY1

, V

ST-BY2

Output voltage I

Line regulation

line

min. load. Decrease T

REGS, V

=7nF; see Figure 5 1.6 ms

C

SLEW

= 125mA 3.14 3.46 V

ST-BY1

7V ≤ V

BAT

amb

ST-BY1,2

≤ 18V

until HSDS,

(Measure ΔVreg1 across V

, V

ST-BY1

Disabled

, V

ST-BY1

Disabled

ST-BY2

BAT

170 °C

10 °C

10 mV

range)

ΔV

Load regulation

load

0.5mA ≤ I (Measure ΔVreg1 across V

ST-BY1

≤ 125mA

BAT

50 mV

range)

=

Δ Quiescent current

I

q1

V

DROPOUT

I

lim1

ΔV

lead

(measure ΔI

Dropout voltage (measure V

when V

V

ST-BY1

Current limit 160 350 mA

V

absolute differential

ST-BY1

BAT

)

ST-BY1

drops 0.1V)

output voltage

ΔV

lag

SVR1 Supply voltage rejection ST-BY1

1.5V/300mA V

V

ST-BY2

ΔV

Output voltage I

Line regulation

line

ST-BY2

I

ST-BY1

I

ST-BY1

I

-

ST-BY1

BAT

I

ST-BY1

force V V

f

o

with 1.0Vp-p AC, f

o

with 1.0Vp-p AC

ST-BY2

7V ≤ V (measure Δ V

range)

= 2mA, V = 125mA, V

BAT

= 14V,

= 14V

BAT

= 125mA = 5mA

Low; Measure

ST-BY2

- V

ST-BY1

= 120-10kHz, V

= 20-20kHz, V

ST-BY2

Low; Measure

ST-BY1

- V

ST-BY2

BAT

= 14V

50

45

= 300mA 1.425 1.575 V

≤ 18V

BAT

ST-BY2

across V

BAT

150

10

μA

mA

2.6

1.2

2.5 V

0.25 V

dB

50 mV

V V

6/17