LM3489_14 datasheet(4/23 Pages) TI1

Numer części	LM3489

Szczegółowy opis	Hysteretic PFET Buck Controller with Enable Pin

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Producent	TI1 [Texas Instruments]

Strona internetowa	http://www.ti.com

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LM3489

SNVS443A – MAY 2006 – REVISED JUNE 2008

www.ti.com

Electrical Characteristics

(1), (2)

Specifications in Standard type face are for TJ = 25°C, and in bold type face apply over the full Operating Temperature

Range (TJ = −40°C to +125°C). Unless otherwise specified, VIN = 12V, VISNS = VIN − 1V, and VADJ = VIN − 1.1V. Datasheet

min/max specification limits are guaranteed by design, test, or statistical analysis.

Symbol

Parameter

Conditions

Min

Typ

Max

Units

ISHDN

Shutdown input supply current

EN = 0V

7

15

µA

VEN

Enable threshold voltage

Enable rising

1.15

1.5

1.85

V

VEN_HYST

Enable threshold hysteresis

130

mV

IQ

Quiescent Current at ground pin

FB = 1.5V (Not Switching)

280

400

µA

VFB

Feedback Voltage

1.223

1.239

1.255

V

(3)

1.214

1.264

VHYST

Comparator Hysteresis

10

15

mV

14

20

VCL_OFFSET

Current limit comparator offset

VFB = 1.0V

-20

0

+20

mV

ICL_ADJ

Current limit ADJ current source

VFB = 1.5V

3.0

5.5

7.0

µA

TCL

Current limit one shot off time

VADJ = 11.5V

6

9

14

µs

VISNS = 11.0V

VFB = 1.0V

RPGATE

Driver resistance

Source

5.5

Ω

ISOURCE = 100mA

Sink

8.5

ISINK = 100mA

IPGATE

Driver Output current

Source

0.44

A

VIN = 7V, PGATE = 3.5V

Sink

0.1

VIN = 7V, PGATE = 3.5V

IFB

FB pin Bias Current

VFB = 1.0V

300

750

nA

(4)

TONMIN_NOR

Minimum on time in normal

VISNS = VADJ + 0.1V

100

ns

operation

Cload on OUT = 1000pF (Note 10)

TONMIN_CL

Minimum on time in current limit

VISNS = VADJ - 0.1V

200

ns

VFB = 1.0V

Cload on OUT = 1000pF (Note 10)

%VFB/ΔVIN

Feedback Voltage Line Regulation

4.5

≤ VIN ≤ 35V

0.01

%/V

(1)

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

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

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

(2)

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

(3)

The VFB is the trip voltage at the FB pin when PGATE switches from high to low.

(4)

Bias current flows out from the FB pin.

4

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