Datasheet L4955V3.3, L4955, L4955V5.1 Datasheet (SGS Thomson Microelectronics)



L4955

5A ULDO LINEAR REGULATORS FAMILY

UP TO 5A OUTPUTCURRENT

2% PRECISEOUTPUT VOLTAGES

±

FASTTRANSIENTRESPONSE

0.75VTYP. DROP OUT VOLTAGEAT 5A OPERATINGINPUT VOLTAGEFROM 4.5V ADJUSTABLEVERSION:

= 1.26V

• V

O

• INHIBIT(I POWERGOOD

•

PROGRAMMABLECURRENT LIMIT

•

= 120µA TYP.)

Q

• HEPTAWATT PACKAGE

FIXED VERSION:

• 3.3V,5.1V OUTPUTS VERSAWATTPACKAGE

•

VERYLOW QUIESCENTCURRENT SHORT CIRCUIT PROTECTION (Foldback

function) THERMALSHUTDOWN

APPLICATIONS

PENTIUMANDPOWER PCSUPPLIES POSTREGULATOR FOR SMPS LOW COST SOLUTION FOR 5V TO 3.3V

CONVERSION LOW COST BATTERYCHARGER CONSTANT CURRENT REGULATOR SUITABLE FOR APPLICATION WITH

STANDBYFEATURE

DESCRIPTION

The L4955 is a familyof monolithic ultra very low drop linear regulators designed to supply the most recent microprocessors.

TYPICALAPPLICATIONS

MULTIPOWER BCD TECHNOLOGY

HEPTAWATT VERSAWATT

ORDERING

NUMBERS

L4955 1.26V ADJ HEPTAWATT L4955V3.3 3.3V VERSAWATT L4955V5.1 5.1V VERSAWATT

OUTPUT

VOLTAGE

(TO-220)

PACKAGE

The dropout voltage is only 0.75V (Typ.) at 5A, directly dependenton the output current conditions.

Realized in BCDII technology, it has on board a charge pump to properly drive an N-channel powermos Transistorwith 150mΩof R

DSON

.

It operates from a 4.5V minimum supply, with a very low quiescent current irrespective of the load; a minimum of 22µF output capacitor is required for stability.

The on-chip trimming techniques improve the precisionof the availableoutputvoltages to±2%.

Ancillary functions like power good, inhibit with low power consumption, programmable output voltage and current limiting make the flexible heptawatt version usable in applications where power management, stand-by, features, post regulation and adjustable current generators for batterychargers are important.

V

IN

C1

February 1999

INH PG

1

CL GND

63

L4955

24

OUTIN

7

R1

ADJ

5

R2

D97IN589

C2

V

OUT

V

IN

C1

1

L4955VXXX

2

GND

3

D97IN590

OUTIN

C2

V

OUT

1/14

L4955

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

IN

P

TOT

T

st,Ti

PIN CONNECTIONS (Top views)

tab connected to pin 4

Supply InputVoltage 24 V ADJ and CL pins

PG and INH pins Power Dissipation @ T

Power Dissipation @ T

amb case

=50°C

=90°C

-0.3 to 4 0toV

2

15

IN

Storage Temperature -40 to +150 °C

7 OUT 6 5 4 3 2 1

D96IN367

PG ADJ GND INH CL IN

3

1

D96IN369

V V

W W

OUT

GND

IN

HEPTAWATT

BLOCK DIAGRAM

10µF

IN

1(1)

REGULATOR

3

INH

1.26V ACTIVE HIGH

PIN x = PIN (x) = VERSAWATT

INHIBIT

V

IN

PRE

HEPTAWATT

V

REF

1.26V

V

REF

=

+

-

+

-

(1/4W, 1%)

VERSAWATT

(TO220)

FIXED

C.L.

E/A

PROGRAM.

C.L.

26

RCL

FOLDBACK

0.9V

REF

4(2)

+

-

GND PGCL

CHARGE

BUFFER

THERMAL

SHUTDOWN

PUMP

POWER

DMOS

150mΩ

D96IN366

OUT

7(3)

ADJ

5

R1 22µF

R2

V

OUT

2/14

PIN FUNCTIONS

HW VW Name Function

1 1 IN Unregulated input voltage; this pin must be bypassed with a capacitor larger than 10µF. 2 – CL A resistor connected between this pin and ground sets the programmable current limiting

value. When the programmable current limiting is not used the pin must be connected to GND.

3 – INH TTL-CMOS input. A logic high level on this input disables the device. An internal pull-down

insures full functionally even if the pin is open. 4 2 GND Ground. 5 – ADJ The output is connected directly to this terminal for 1.26V operation; it is connected to the

output through a resistivedivider for higher voltages. 6 – PG Opendrainoutput, this signal islow when the outputvoltage is lower than 90%,otherwise is high. 7 3 OUT Regulated output voltage. A minimum bypass capacitor of 22µF is requiredto insure stability.

L4955

THERMAL DATA

(HEPTAWATT& VERSAWATTpackages)

Symbol Parameter Value Unit

R

th j-case

R

th j-amb

Thermal ResistanceJunction-case Max. 2.5 °C/W Thermal ResistanceJunction-ambient Max. 50 °C/W Thermal Shutdown Typ. 150 °C Thermal Hysteresis Typ. 20 °C

L4955 - ELECTRICAL CHARACTERISTICS (Tj=25°C, Vin= 12V, unless otherwise specified).

•

= Specificationsreferredto TJfrom0°Cto +125°C.

Symbol Parameter Test Condition Min. Typ. Max. Unit

V

IN

V

O

V

∆ ∆V

V

O

I

O

I

Q

(1) Output voltage connected to ADJ.

OperatingSupply Voltage 4.5 22 V Output Voltage (1) 0.1A< IO<5A; 4.5V< VIN<12V 1.235 1.26 1.285 V

4.5V < V

Line regulation (1) 4.5V < VIN<22V; IO= 10mA 2 10 mV

O

Load regulation (1) 0.1A < IO < 5A 2 10 mV

O

<12V; 0.1A< I

IN

Dropout Voltage IO=5A

V

4.5V

≥

IN

=2A • 0.55 0.75 V

I

O

<5A • 1.222 1.26 1.298 V

O

0.75 1.1 V

• 1.1 1.5 V

Current Limiting • 5.1 6.3 7.5 A

Short Circuit Current V Programmable Current

Limiting Quiescent Current 0.1A < IO<5A CL=0

=0V • 1.8 A

O

R R

lim lim

= 13kΩ = 47k

Ω

•

2.55

0.7030.85 2

C

= 13k

L

2.7 Stand By Current INH = 5V 120 200 Inhibit Threshold Rising Edge

• 1.1 1.26 1.42 V

Inhibit Hysteresis 0.2 V Inhibit Bias Sink Current INH = 5V or 0.8V 20 60 Power Good Threshold Rising Edge 0.9x V Power Good Hysteresis Power Good Saturation I

PG

= 4mA

Ripple Rejection f = 120Hz,I

V

=6V∆VIN=2V

IN

O

=5A

PP

• 0.2 V

•

60 75 dB

O

0.1 0.4 V

3.45

1.00 3

4

A A

mA mA

µ

V

A

3/14

L4955

L4955V3.3 - ELECTRICAL CHARACTERISTICS

•

= Specificationsreferredto TJfrom0°Cto +125°C.

=25°C, Vin= 5V,unless otherwise specified)

(T

j

Symbol Parameter Test Condition Min. Typ. Max. Unit

V V

∆ ∆V

IN

O

V

I

O

I

Q

Operating Input Voltage 4.5 22 V Output Voltage 4.75V< VIN<12V; 0.1A< IO< 5A 3.234 3.300 3.366 V

4.75V< V

Line regulation 4.5V < VIN<12V; IO= 10mA 2 10 mV

O

Load regulation 0.1A < IO < 5A 3 15 mV

O

<12V; 0.1A< I

IN

<5A • 3.201 3.300 3.399 V

O

Current Limiting • 5.1 6.3 7.5 A

Short Circuit Current V

=0V • 1.8 A

O

Quiescent Current 0.1A < IO<5A 2 3 mA Ripple Rejection f = 120Hz,I

V

=6V∆VIN=2V

IN

O

=5A

PP

57 70 dB

L4955V5.1 - ELECTRICAL CHARACTERISTICS (Tj=25°C, Vin= 8V,unless otherwise specified)

•

= Specificationsreferredto TJfrom0°Cto +125°C.

Symbol Parameter Test Condition Min. Typ. Max. Unit

V

IN

V

O

V

D

Operating Input Voltage VO+V

D

Output Voltage 6.75V< VIN<15V; 0.1A< IO< 5A 5.000 5.100 5.200 V

6.75V < V

< 15V; 0.1A< I

IN

<5A • 4.950 5.100 5.250 V

O

Drop-out Voltage IO= 5A 0.75 1.1 V

22 V

• 1.1 1.5 V

=2A • 0.55 0.75 V

I

O

∆V ∆V

I

O

I

Q

Line regulation 6.5V < VIN<15V; IO= 10mA 2 10 mV

O

Load regulation 0.1A < IO < 5A 5 20 mV

O

Current Limiting • 5.1 6.3 7.5 A

Short Circuit Current V

=0V • 1.8 A

O

Quiescent Current 0.1A < IO<5A 2 3 mA Ripple Rejection f = 120Hz,I

V

=8V∆VIN=2V

IN

O

=5A

PP

55 65 dB

4/14

L4955

Figure 1:

Ou tput C urrent [A ]

8 7 6 5 4 3 2 1 0

0 2.5 5 7.5 10 12.5 15 17.5 20 22.5

L4955 DC Operating Area

Current Lim itation

Rdson

limit

DC O perating A rea

Power D issipation Lim it

(Vin - Vout) [V]

Vin > 4.5V Tj = 125°C

Tc = 25°C Pdm ax = 40W

Tc = 70°C Pdmax = 22W

Figure 3: LineRegulationvs. Junction

Temperature

5

4.5 4

3.5 3

2.5 2

1.5 1

Output Voltage Deviation [m V

0.5

0

-40 -20 0 20 40 60 80 100 120 140 160

Figure 5:

1.25

0.75

M in im u m V in - Vo u t Vo lta g e [V ]

0.25

DropoutVoltage

1

0.5

0

0123456

4.5V <Vin<22V Iout=10mA

Tj[°C]

Tj = 125 °C

Tj= 25 °C

Tj= -40°C

Pulsed techniq ue has b een used

Iout [A]

Figure2:

OutputVoltage Stabilityvs. Junction Temperature

Vout [V]

1.28

1.275

1.27

1.265

1.26

1.255

1.25

1.245

1.24

-40 0 40 80 120 160

Vin=12V

Iout=10m A

Tj [°C]

Figure4: Load Regulation

5 4 3 2 1 0

-1

-2

Output Voltage Deviation [m V ]

-3

-4

-5 012345

Figure6:

MaximumOutputCurrentvs.Junction

(Pulsed techn ique has been used)

Vin = 12V Tj= 25 °C

Vo u t = V

Iou t [ A ]

ADJ

Temperatur ewithinternalcurrentlimiti ng

O utp ut C urre n t [A]

10

9 8 7 6 5 4 3 2 1 0

-40 -20 0 20 40 60 80 100 120 140 160

*Pulsed tecnique has been used

(Vin-Vout) > 2V

pin 2 = GND

Tj [°C]

5/14

L4955

Figure 7:

S ho rt-circuit Cu rrent [A]

3.5

3

2.5

2

1.5

1

0.5

0

-40 -20 0 2 0 40 60 80 100 12 0 140 160

*Pulsed tecnique has been used

Figure 9:

Iq [m A ]

5

4.5 4

3.5 3

2.5 2

1.5 1

0.5 0

Figure 11: Stand-byCurrent vs. Supply Voltage

Iq [u A ]

400

350

300

250

200

150

100

50

0

6/14

Short-circuitCurrent vs.Junction

Temperaturewith Programmable Current Limiting

Rlim = 13 k

Rlim = 19 kΩ

Rlim = 47 kΩ

Tj [°C]

Ω

QuiescentCurrent vs. Supply voltage

(CL = 0V)

Io = 1 0 m A to 5 A

Tj= - 40°C

Tj=25°C Tj=125°C

0 5 10 15 20 25

Vin[V]

with INH = LOGIC HIGH

Tj= 25°C

0 5 10 15 20 2 5

Vin [V]

L4955

Figure8:

Iq [m A]

2.6

2.4

2.2 2

1.8

1.6

1.4

1.2 1

0.8

0.6

0.4

-40-200 20406080100120140160

Figure10:

Iq [mA]

5

4.5

4

3.5

3

2.5

2

1.5

1

0.5

0

0 5 10 15 20 25

Figure12:

R ip p le R e je c tio n [d B ]

100

90

80

70

60

50

40

30

20

10

0

QuiescentCurrent vs.Temperature

(CL = 0V)

Vin=12V Iout=10m A to 5A

Tj[°C]

QuiescentCurrent vs. Supply Voltage

with ProgrammableCurrent Limiting

Tj = 25°C

Rlim= 13k

Ω

Rlim = 47kΩ

Vin [V]

RippleRejection vs. Frequency

Vripple = 3V p-p V ripple = 0.5Vp-p

Cin = 22uF Cout = 2 2uF Vout = 1.26V Vinmin = 4.5V

Io u t = 5 A

1k10 100 10k

Frequency [Hz]

100k

Figure 13: RippleRejection vs. OutputCurrent

L4955

Figure14:

L4955

PowerGood Function

R ipp le R e jec t io n [d B ]

100

90

Fripple=120Hz Vripple=3Vp-p

80 70 60 50

Fripple=10kHz Vripple= 0.5V p-p

Fripple=1kHz V ripple= 0.5V p-p

40 30 20 10

Cin=22uF Cout=22uF Vout=1.26V Vinmin=4.5V

0

012345

Iou t [A ]

Fripple=50kHz Vripple=0.5Vp-p

Figure 15: InhibitFunction

V

INH

Vref = 1.26V

0.9 V

V

ADJ

PG

ADJ

Low

High

V

OUT=VADJ

hyst = 200mV

D96IN364B

(R1+R2)/R2

t

Low

t

hyst = 200mV

regulator

ON

regulator

OFF

regulator

ON

D96IN365A

t

7/14

L4955

LINE TRANSIENTRESPONSE Figure 16.

Figure 17.

Figure 18.

Test condition

8/14

= 12V; ∆VIN= 1V; VO= 3.3V; IO=200mA; CIN=10µF (electrolyticcapacitor);

:V

IN

C

=22µF (electrolyticcapacitor);dV/dt = 0.1 V/µs; TJ=25°C

out

LOAD TRANSIENT RESPONSE Figure 19.

Figure 21.

L4955

Figure20.

Test condition:

V

IN

= 5V, V

= 3.3V; Load Transient from 0.5A to 5A;

OUT

Figure 22: Loadtransient test circuit.

IN

L4955

C1,C2

470µ

F/25V

Panasonic

HFQ

2

CL GND

PG

6

43

INH

dI

out

dt

OUT

7

R4

ADJ

5

910

R5

560

C4 to

C9

100µ

F/10V

AVX TPS

6 each

D97IN546

A

⁄µs;TJ=25°C

= 20

C10 to

AVX

VOUT = 3.3VVIN = 5V 1

C15

1µF

X7R

6 each

9/14

L4955

L4955V3.3

Figure 23:

DCoperating area.

Output Current [A]

8

7

6

5

Curre nt L imitation

Power D issipation Limit

Rdson

4

3

2

1

0

limit

DC Operating Area

3 4.5 6 7.5 9 10.51213.51516.51819.52122.5

Vout = 3.3V Tj = 125°C

Tc = 25°C Pdmax=40W

Tc=70°C Pdmax=22W

Input Voltage [V]

Figure 25: QuiescentCurrent vs. Temperature.

Iq [m A]

3

2.75

2.5

2.25 2

1.75

1.5

1.25 1

0.75

0.5

0.25

Vin=5V Iout = 10mA to 5A

0

-40 -20 0 20 40 60 80 100 120 140 160 Tj[°C]

Figure24:

OutputVoltage Stability vs. Junction

Temperature.

Vout [V]

3.4

3.35

3.3

3.25

3.2

-40 0 40 80 120 160

Vin = 5V

Iou t = 10 mA

Tj [°C]

Figure26: Load Regulation

5 4 3 2 1 0

-1

-2

Output Voltage Deviation [mV]

-3

Vin=5V Tj = 25 °C

-4 (Pulsed tec nique has been used)

-5

012345

Iout [A]

Figure 27:

Lineregulation vs. JunctionTemperature.

5

4.5 4

4.5V<Vin<12V

3.5

Iout = 10mA

3

2.5 2

1.5

Output Voltage Deviation [mV]

1

0.5 0

-40 -20 0 20 40 60 80 100 120 140 160

10/14

Tj [°C]

Figure28:

MaximumOutput Currentvs.Junction

Temperaturewith internalcurrentlimiting

O utp ut C urre n t [A]

10

9 8 7 6 5 4 3 2 1 0

-40 -20 0 20 40 60 80 100 120 140 160

*Pulsed tecnique has been used

(Vin-Vout) > 2V

pin 2 = GND

Tj [°C]

L4955V5.1

L4955

Figure 29:

Output C u rr ent [A ]

8

7

6

5

4

3

2

1

0

0 2.5 5 7.5 10 12.5 15 17.5

DCoperating area.

Curre nt Lim itation

Rdso n

limit

DC Operatin g Area

Pow er Dissipation Limit

(V in - Vout) [V ]

Vout = 5.1V Tj = 125°C

Tc = 25°C Pdmax = 40W

Tc = 70°C Pdmax = 22W

Figure 31: QuiescentCurrent vs. Temperature.

Iq [mA]

3

2.75

2.5

2.25 2

1.75

1.5

1.25 1

0.75

0.25

Vin = 8 V

0.5 Iout = 10mA to 5A

0

-40 -20 0 20 40 60 80 100 120 140 160 Tj [°C]

Figure30:

OutputVoltage Stability vs. Junction

Temperature.

Vout [V]

5.2 Vin = 8V

5.15

5.1

5.05

5

4.95

4.9

Iout = 1 0mA

-40 0 40 80 120 1 60 Tj [°C]

Figure32: Load Regulation

10

8 6 4 2 0

-2

-4

Vin = 8V

Output Voltage Deviation [mV]

-6

Tj = 25 °C (Pulse d tecn iqu e h as been used )

-8

-10 012345

Iout [A]

Figure 33:

Lineregulation vs. JunctionTemperature.

5

4.5 4

6.5V < Vin < 15V Iout= 10mA

3.5 3

2.5 2

1.5

Output Voltage Deviation [mV]

1

0.5 0

-40 -20 0 20 40 60 80 100 120 140 160 Tj [°C]

Figure34:

Maximu mOutp utCur r entvs.Junction

Temperaturewith internalcurrentlimiting

O utp ut C urre n t [A]

10

9 8 7 6 5 4 3 2 1 0

-40 -20 0 20 40 60 80 100 120 140 160

*Pulsed tecnique has been used

(Vin-Vout) > 2V

pin 2 = GND

Tj [°C]

11/14

L4955

DIM.

MIN. TYP. MAX. MIN. TYP. MAX.

A 4.8 0.189 C 1.37 0.054 D 2.4 2.8 0.094 0.110

D1 1.2 1.35 0.047 0.053

E 0.35 0.55 0.014 0.022

E1 0.7 0.97 0.028 0.038

F 0.6 0.8 0.024 0.031

F1 0.9 0.035

G 2.34 2.54 2.74 0.095 0.100 0.105 G1 4.88 5.08 5.28 0.193 0.200 0.205 G2 7.42 7.62 7.82 0.295 0.300 0.307

H2 10.4 H3 10.05 10.4 0.396 0.409

L 16.7 16.9 17.1 0.657 0.668 0.673 L1 14.92 L2 21.24 21.54 21.84 0.386 0.848 0.860 L3 22.27 22.52 22.77 0.877 0.891 0.896 L4 1.29 L5 2.6 2.8 3 0.102 0.110 0.118 L6 15.1 15.5 15.8 0.594 0.610 0.622 L7 6 6.35 6.6 0.236 0.250 L9 0.2 0.008

M 2.55 2.8 3.05 0.100 0.110 0.120

M1 4.83 5.08 5.33 0.190 0.200 0.210

V4 40° (typ.)

Dia 3.65 3.85 0.144 0.152

mm inch

0.409

0.587

0.051

0.260

OUTLINE AND

MECHANICAL DATA

Heptawatt V

H3

L

VV

E

L1

M1

A

C

D

D1

L2

L5

L3

H1

Dia.

M

F

E1

E

GG1G2

H2

V4

L9

F

L7

L4

L6

F1H2

HEPTAMEC

12/14

L4955

DIM.

MIN. TYP. MAX. MIN. TYP. MAX.

A 4.40 4.60 0.173 0.181

C 1.23 1.32 0.048 0.051

D 2.40 2.72 0.094 0.107

E 0.49 0.70 0.019 0.027

F 0.61 0.88 0.024 0.034 F1 1.14 1.70 0.044 0.067 F2 1.14 1.70 0.044 0.067

G 4.95 5.15 0.194 0.203

G1 2.40 2.70 0.094 0.106

H2 10.0 10.4 0.393 0.409 L2 16.4 0.645 L4 13.0 14.0 0.511 0.551 L5 2.65 2.95 0.104 L6 15.25 15.75 0.600 0.620 L7 6.20 6.60 0.244 0.260 L9 3.50 3.93 0.137 0.154

M 2.6 0.102

Dia 3.75 3.85 0.147 0.151

mm inch

0.116

OUTLINE AND

MECHANICAL DATA

Versawatt (TO220)

M

TO220MEC

13/14

L4955

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14/14

Datasheet L4955V3.3, L4955, L4955V5.1 Datasheet (SGS Thomson Microelectronics)

Specifications and Main Features

Frequently Asked Questions

User Manual