L4812CX [STMICROELECTRONICS]

VERY LOWDROP VOLTAGE REGULATORS; 非常LOWDROP稳压器


型号：	L4812CX
厂家：	ST
描述：	VERY LOWDROP VOLTAGE REGULATORS 非常LOWDROP稳压器稳压器
文件：	总7页 (文件大小：140K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

L4805-L4885-L4892

L4808-L4810-L4812

VERY LOW DROP VOLTAGE REGULATORS

INPUT/OUTPUT DROP TYP. 0.4V

400mA OUTPUT CURRENT

LOW QUIESCENT CURRENT

REVERSE POLARITY PROTECTION

OVERVOLTAGEPROTECTION (± 60V)

FOLDBACK CURRENT LIMITING

THERMAL SHUTDOWN

DESCRIPTION

L4800 series devices are voltage regulators with a

verylow voltage drop (typically 0.4V at fullrated cur-

rent), output current up to 400mA, low quiescent

currentandcomprehensiveon-chipprotection.The-

se devices are protected against load dump and

field decaytransients of ± 60V, polarity reversaland

overheating. A foldback current limiter protects

against load short circuits. Available in 5V, 8.5V,

9.2V,10V and12Vversions(all± 4%,T_I=25°C)the-

se regulatorsaredesignedforautomotive, industrial

and consumer applications where low consumption

is particularly important.

SOT-82

TO-220

In automotiveapplications the L4805 is ideal for 5V

logicsuppliesbecauseitcan operateevenwhen the

batteryvoltagefallsbelow 6V. In batterybackupand

standbyapplications the low consumption of these

devices extends battery life.

BLOCK DIAGRAM

March 1992

1/7

L4805-L4808-L4885-L4892-L4810-L4812

ABSOLUTE MAXIMUM RATINGS

Symbol

Parameter

Value

+ 35

- 18

Unit

V_I

DC Input Voltage

DC Input Reverse Voltage

Transient Input Overvoltages :

Load Dump :

5ms < T_rise< 10ms,

τ_fFall Time Constant = 100ms,

R_source< 0.5Ω

Field Decay :

- 60

5ms < t_fall< 10ms, R_source< 10Ω

τ_rRise Time Constant = 33ms

Junction and Storage Temperature Range

T_j, T_stg

- 55 to + 150

°C

THERMAL DATA

Symbol

Parameter

SOT82

TO220

Unit

R_{th j-case}

R_{th j-amb}

Thermal Resistance Junction-case

Max.

°C/W

Thermal Resistance Junction-ambient

100

PIN CONNECTION (top view)

Order Codes

Output Voltage

TO-220

SOT-82

L4805CV

L4808CV

L4885CV

L4892CV

L4810CV

L4812CV

L4805CX

L4808CX

L4885CX

L4892CX

L4810CX

L4812CX

8.5 V

9.2 V

10 V

12 V

TEST AND APPLICATION CIRCUIT

Theoutput capacitorisrequired forstability. Though

the 100 µF shown is the minimum recommended

value, actual size and type may vary depending

upon the application load and temperature range.

Capacitoreffectiveseriesresistance (ESR)alsofac-

tors in the IC stability. Since ESR varies from one

brandtothe next,some bench workmay be required

to determine the minimum capacitor value to use in

production. Worst-case is usuallydetermined at the

minimum ambient temperature and maximum load

expected.

Capacitorsmust also berated at all ambient tempe-

ratureexpectedin the system. Many aluminum type

electrolyticswill freeze at temperatures less than –

30 °C, reducing their effective capacitance to zero.

To maintain regulatorstability down to – 40 °C, ca-

pacitors rated at that temperature (such as tan-

talums) must be used.

Output capacitors can be increased in size to any

desired value above the minimum. One possible

purpose of this would be to maintain the output vol-

tages during brief conditions of negative input tran-

sients that might be characteristics of a particular

system.

2/7

L4805-L4808-L4885-L4892-L4810-L4812

ELECTRICAL CHARACTERISTICS (V_I= 14.4V; C_O= 100µF; T_j= 25°C unless otherwise specified.)

Symbol

Parameter

Output Voltage

Test Condition

I_O= 5mA to 400mA (L4805)

I_O= 5mA to 400mA (L4808)

I_O= 5mA to 400mA (L4810)

I_O= 5mA to 400mA (L4812)

I_O= 5mA to 400mA (L4885)

I_O= 300mA (L4892)

Min.

4.80

7.68

8.16

8.83

9.60

11.50

Typ.

5.00

Max.

5.20

8.32

8.84

9.57

10.40

12.50

Unit

V_O

8.00

8.50

9.20

10.00

12.00

V_I

Operating Input Voltage

Line Regulation

∆V_O/V_O

V_I- V_O

VI = 13 to 26V; I_O= 5mA

IO = 5 to 400mA*

I_O= 400mA*

mV/V

Load Regulation

Dropout Voltage

0.4

0.2

0.8

0.1

0.7

I_O= 150mA

0.4

I_q

Quiescent Current

I_O= 0mA

I_O= 150mA

I_O= 400mA*

∆V_O

Temperature Output Voltage

Drift

°C•V

∆T•V_O

Supply Voltage Rejection

I_O= 350mA; f = 320Hz;

C_O= 100µF; V_I= V_O+3V+2V_pp

SVR

I_O

Max Output Current

800

350

I_SC

Output Short Circuit Current

(fold back condition)

500

* only for L4892 the current test conditions is I_O= 300mA

ELECTRICAL CHARACTERISTICS (V_I= 14.4V; C_O= 100µF; T_j= -40 to 125°C (note 1) unless

otherwise specified.)

Symbol

Parameter

Output Voltage

Test Condition

I_O= 5mA to 400mA (L4805)

I_O= 5mA to 400mA (L4808)

I_O= 5mA to 400mA (L4810)

I_O= 5mA to 400mA (L4812)

I_O= 5mA to 400mA (L4885)

I_O= 300mA (L4892)

see note 2

Min.

4.70

7.50

8.00

8.65

9.40

11.30

Typ.

5.00

Max.

5.30

8.50

9.00

9.75

10.60

12.70

Unit

V_O

8.00

8.50

9.20

10.00

12.00

V_I

Operating Input Voltage

Line Regulation

∆V_O/V_O

V_I- V_O

VI = 14 to 26V; I_O= 5mA

IO = 5 to 400mA*

mV/V

Load Regulation

Dropout Voltage

I_O= 400mA*

0.5

0.25

1.2

0.9

I_O= 150mA

0.5

I_q

Quiescent Current

I_O= 0mA

I_O= 150mA

I_O= 400mA*

140

I_O

Max Output Current

870

230

I_SC

Output Short Circuit Current

(fold back condition)

Notes : 1. This limits are guaranteed by design, correlation and statistical control on production samples over the indicated temperature and

supply voltage ranges..

2. For a DC voltage 26V < Vi < 35V the device is not operating.

3/7

L4805-L4808-L4885-L4892-L4810-L4812

Figure 1: Dropout Voltage vs. Output Current

Figure 2: Quiescent Current vs. Output Current

Figure 4: Foldback Current Limiting(L4805)

Figure 3: Output Voltage vs. Temperature

Figure 5: Preregulator for Distributed Supplies

4/7

L4805-L4808-L4885-L4892-L4810-L4812

SOT82 PACKAGE MECHANICAL DATA

inch

DIM.

MIN.

7.4

TYP.

MAX.

7.8

MIN.

0.291

0.413

0.028

0.019

0.094

TYP.

MAX.

0.307

0.425

0.035

0.030

0.106

10.5

0.7

10.8

0.9

0.49

2.4

0.75

2.7

1.2

15.7

2.2

0.047

0.618

0.087

0.173

0.150

4.4

3.8

2.54

0.100

5/7

L4805-L4808-L4885-L4892-L4810-L4812

TO220 PACKAGE MECHANICAL DATA

inch

TYP.

DIM.

MIN.

TYP.

MAX.

4.8

MIN.

MAX.

0.189

0.054

0.110

0.053

0.022

0.041

0.055

0.205

0.409

1.37

2.8

2.4

1.2

0.094

0.047

0.014

0.031

0.045

0.195

1.35

0.55

1.05

1.4

0.35

0.8

1.15

4.95

5.08

5.21

10.4

0.200

Dia

10.05

0.396

16.2

26.7

0.638

1.051

26.3

2.6

27.1

1.035

0.102

0.594

0.236

0.144

1.067

0.118

0.622

0.260

0.152

15.1

15.8

6.6

3.65

3.85

6/7

L4805-L4808-L4885-L4892-L4810-L4812

Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for

the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its

use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifica-

tions mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information pre-

viously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or

systems without express written approval of SGS-THOMSON Microelectronics.

SGS-THOMSON Microelectronics GROUP OF COMPANIES

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7/7

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