LM2647

www.ti.com

SNVS210E – MAY 2004 – REVISED JUNE 2005

Electrical Characteristics

(1)

Min

Typical

Max

Symbol

Parameter

Conditions

Units

(2)

(3)

(2)

Reference

FB Pin Voltage at Regualtion

VDD = 4.5V to 5.5V,

591

600

609

mV

(either FB Pin)

VIN = 5.5V to 28V

VDD = 4.5V to 5.5V,

0.5

VIN = 5.5V to 28V

FB Pin Current (sourcing)

20

100

nA

Chip Supply

VIN Quiescent Current

100

200

µA

VIN Shutdown Current

0

5

µA

VDD Quiescent Current

2.5

4

mA

VDD Shutdown Current

8

15

µA

V5 Normal Operating Current

0.3

0.5

mA

1

1.5

V5 Shutdown Current

0

5

µA

BOOT Quiescent Current

2

5

µA

300

500

BOOT Shutdown Current

1

5

µA

VDD UVLO Threshold

VDD rising from 0V

3.9

4.2

4.5

V

VDD UVLO Hysteresis

0.5

0.7

0.9

V

Logic

EN Input Current

0

µA

EN Input Logic High

2

1.8

V

EN Input Logic Low

1.3

0.8

V

FPWM Pull-down

100

200

1000

k

Ω

FPWM Input Logic High

2

1.8

V

FPWM Input Logic Low

1.3

0.8

V

Power Good

Power Good Upper Threshold as

110

113

116

%

a Percentage of Internal

Reference

Power Good Lower Threshold as

84

87

90

%

a Percentage of Internal

Reference

Power Good Hysteresis

7

%

Power Good Delay

From both output voltages “good”

10

20

30

µs

to PGOOD assertion.

From the first output voltage “bad”

4

7

10

to PGOOD de-assertion

From Enable low to PGOOD low

0.03

0.1

PGOOD Saturation Voltage

PGOOD de-asserted (Power Not

0.12

0.4

V

Good) and sinking 1.5mA

PGOOD Leakage Current

PGOOD = 5V and asserted

0

1

µA

OV and UV Protection

(1)

(2)

All limits are guaranteed at room temperature (standard face type) and at temperature extremes (bold face type). All room temperature

limits are 100% production tested. All limits at temperature extremes are guaranteed via correlation using Statistical Quality Control

(SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).

(3)

Typical numbers are at 25°C and represent the most likely norm.

Copyright © 2004–2005, Texas Instruments Incorporated

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