SGS Thomson Microelectronics L4902A Datasheet



DUAL 5V REGULATOR WITH RESETAND DISABLE

.

DOUBLEBATTERYOPERATING

.

OUTPUTCURRENTS : I01=300 mA

= 300 mA

I

02

.

FIXED PRECISIONOUTPUT VOLTAGE
5V±

2

%

.

RESETFUNCTION CONTROLLED BY INPUT
VOLTAGEANDOUTPUT1 VOLTAGE

.

RESET FUNCTION EXTERNALLY PRO­GRAMMABLETIMING

.

RESET OUTPUT LEVEL RELATED TO OUT­PUT 2

.

OUTPUT 2 INTERNALLY SWITCHED WITH
ACTIVEDISCHARGING

.

OUTPUT2 DISABLELOGICALINPUT

.

LOW LEAKAGE CURRENT, LESS THAN 1µA
ATOUTPUT1

.

RESETOUTPUT NORMALLY HIGH

.

INPUT OVERVOLTAGE PROTECTION UP TO
60V

.

OUTPUTTRANSISTORS SOA PROTECTION

.

SHORT CIRCUIT AND THERMAL OVER­LOADPROTECTION

L4902A

HEPTAWATT

ORDERING NUMBER : L4902A

(Vertical)

DESCRIPTION

The L4902A is a monolithic low drop dual 5V
regulatordesignedmainlyfor supplying microproc­essorsystems.

Reset and data save functions and remoteswitch
on/offcontrol can be realized.

PIN CONNECTION

June 2000

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L4902A

PIN FUNCTIONS

N°

1 Input 1 Regulators Common Input
2 Timing

3 Disable Input A high level (> V
4 GND Common Ground
5 Reset Output When pin 2 reaches 5V the reset output is switched high.

6 Output 2 5V – 300mA Regulator Output. Enabled if V
7 Output 1 5V – 300mA. Low leakage (in switch-OFF condition) output

BLOCKDIAGRAM

Name Function

If Reg. 2 is switched-ON thedelay capacitor is charged with a5µA constant current. When

Capacitor

Reg. 2 is switched-OFF the delay capacitor is discharged.

) disable outputReg. 2.

DT

5V

(

Therefore t

RD=Ct

Reg. 2 is switched-OFF the C

);tRD(ms) = Ct(nF)

10µA

capacitor is discharged.

02

1>VRT. DISABLE INPUT < VDTand VIN>VIT.If

o

SCHEMATIC DIAGRAM

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L4902A

ABSOLUTE MAXIMUMRATINGS

Symbol Parameter Value Unit

V

I

T

stg,Tj

IN

o

DC Input Voltage
Transient Input Overvoltage(t = 40ms)

Output Current Internally Limited
Storage and Junction Temperature – 40 to 150

THERMAL DATA

Symbol Parameter Value Unit

R

th j-case

Thermal Resistance Junction-case Max 4

28
60

V
V

°C

°C/W

ELECTRICAL CHARACTERISTICS

(V

IN

= 14.4V,T

=25oC unless otherwise specified))

amb

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

DC Operating Input Voltage 24 V

i

V

V

V

I

I

L01

I

V

V

V

∆V
∆V
∆V
∆V

V

V

V

V

t

V

∆V

∆

∆V

∆

SVR1 Supply Voltage Rejection f = 100Hz V

Output Voltage 1

01

Output Voltage 2 HIGH

02 H

Output Voltage 2 LOW I02= – 5mA 0.1 V

02 L

Output Current 1 max.

01

Leakage Output 1 Current
Output Current 2 max.

02

Output 1 Dropout Voltage (*) I01= 10mA

i01

Input Threshold Voltage V01+ 1.2 6.4 V01+ 1.7 V

IT

Input Threshold VoltageHyst. 250 mV

iTH

Line Regulation 1 7V < VIN< 24V,I01= 5mA 5 50 mV

01

Line Regulation 2 7V < VIN< 24V,I02= 5mA 5 50 mV

02

Load Regulation 1 5mA < I01< 300mA 40 80 mV

01

Load Regulation 2 5mA < I02< 300mA 50 80 mV

02

Quiescent Current

I

Q

Reset Threshold Voltage V02– 0.15 4.9 V02– 0.05 V

RT

Reset Threshold Hysteresis 30 50 80 mV

RTH

Reset Output Voltage HIGH

RH

Reset Output Voltage LOW IR= – 1mA 0.25 0.4 V

RL

Reset Pulse Delay Ct= 10nF 3 5 11 ms

RD

t

Timing Capacitor Discharge Time Ct= 10nF 20

d

V02Disable Threshold Voltage 1.25 2.4 V

DT

I

V02Disable Input Current

D

01

Thermal Drift

T

02

Thermal Drift

T

R Load 1k
R Load 1k

= – 100mV

∆V

01

=0,V01≤ 3V

V

IN

= – 100mV

∆V

02

= 100mA

I

01

= 300mA

I

01

I
0<V
7V < V
7V < V

I

V
V

01=I02

= 500µA

R

≤ 0.4V

D

≥ 2.4V

D

≤

< 13V

IN

< 13V V02LOW

IN

< 13V V02HIGH

IN

–20°C≤T

–20°C≤T

Io = 100mA

Ω 4.95 5.05 5.15 V
Ω V

–0.1 5 V

01

300 mA

300 mA

0.7

0.8

1.1

5mA

4.5

2.7

1.6

V

– 1 4.12 V

02

– 150

–30

amb

amb

R

≤125°C

≤125°C

= 0.5V

50 84 dB

0.3

– 0.8

0.3

– 0.8

1

0.8
1

1.4

6.5

4.5

3.5

01

V

µA

V
V
V

mA

02

V

µs

µA
µA

mV/°C

mV/°C

SVR2 Supply Voltage Rejection 50 80 dB

* The dropoutvoltage is defined as thedifference between theinput and the outputvoltage when theoutputvoltage is lowered of 25mV under
constant output current condition.

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