L4949 datasheet(3/8 Pages) MOTOROLA | MULTIFUNCTION VERY LOW DROPOUT VOLTAGE REGULATOR

3 page

L4949

MOTOROLA ANALOG IC DEVICE DATA

ELECTRICAL CHARACTERISTICS (continued) (VCC = 14 V, –40°C < TJ < 125°C, unless otherwise specified.)

Characteristic

Unit

Max

Typ

Min

Symbol

RESET

Reset Threshold Voltage

VResth

–

Vout – 0.5

–

Reset Threshold Hysteresis

VResth,hys

@ TJ = 25°C

100

200

@ TJ = –40 to +125°C

–

300

Reset Pulse Delay (CT = 100 nF, tR ≥ 100 µs)

tResD

100

180

Reset Reaction Time (CT = 100 nF)

tResR

–

5.0

µs

Reset Output Low Voltage (RReset = 10 kΩ to Vout, VCC ≥ 3.0 V)

VResL

–

0.4

Reset Output High Leakage Current (VReset = 5.0 V)

IResH

–

1.0

µA

Delay Comparator Threshold

VCTth

–

2.0

–

Delay Comparator Threshold Hysteresis

VCTth, hys

–

100

–

SENSE

Sense Low Threshold (VSI Decreasing = 1.5 V to 1.0 V)

VSOth

1.16

1.23

1.35

Sense Threshold Hysteresis

VSOth,hys

100

200

Sense Output Low Voltage

VSOL

–

0.4

(VSI ≤ 1.16 V, VCC ≥ 3.0 V, RSO = 10 kΩ to Vout)

Sense Output Leakage (VSO = 5.0 V, VSI ≥ 1.5 V)

ISOH

–

1.0

µA

Sense Input Current

ISI

–1.0

0.1

1.0

µA

PREREGULATOR

Preregulator Output Voltage (IZ = 10 µA)

–

6.3

–

PIN FUNCTION DESCRIPTION

Symbol

Description

VCC

Supply Voltage

Input of Sense Comparator

Output of Preregulator

Reset Delay Capacitor

Gnd

Ground

Reset

Output of Reset Comparator

Output of Sense Comparator

Vout

Main Regulator Output

4.96

4.98

5.0

5.02

5.04

–40

–20

100

120

TJ, JUNCTION TEMPERATURE (°C)

VCC = 14 V

Iout = 1.0 mA

2.0

3.0

4.0

6.0

010

VCC, SUPPLY VOLTAGE (V)

1.0

TJ = 25°C

RL = 100 Ω

RL = 5.0 k

5.0

2.0

3.0

4.0

5.0

6.0

7.0

8.0

9.0

Figure 1. Output Voltage versus

Junction Temperature

Figure 2. Output Voltage versus

Supply Voltage

TYPICAL CHARACTERIZATION CURVES

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