LM3485Q1MMX datasheet(5/28 Pages) TI1

部件名	LM3485Q1MMX

功能描述	Hysteretic PFET Buck Controller

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制造商	TI1 [Texas Instruments]

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LM3485

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SNVS178H – JANUARY 2002 – REVISED DECEMBER 2015

6.5 Electrical Characteristics

Specifications are for TJ = 25°C. Unless otherwise specified, VIN = 12 V, VISNS = VIN − 1 V, and VADJ = VIN − 1.1 V. Data sheet

minimum and maximum specification limits are specified by design, test, or statistical analysis.

PARAMETER

TEST CONDITIONS

MIN(1)

TYP(2)

MAX(1)

UNIT

FB = 1.5 V (Not Switching)

250

Quiescent current at ground

IQ

µA

(TJ = −40°C to 125°C)

400

1.226

1.242

1.258

VFB

Feedback voltage(3)

V

(TJ = −40°C to 125°C)

1.217

1.267

10

15

VHYST

Comparator hysteresis

mV

(TJ = −40°C to 125°C)

14

20

RADJ = 20 kΩ

110

Current limit comparator trip

VCL

(4)

mV

voltage

RADJ = 160 kΩ

880

VFB = 1.5 V

0

Current limit comparator

VCL_OFFSET

mV

offset

(TJ = −40°C to 125°C)

−20

20

VFB = 1.5 V

5.5

Current limit ADJ current

ICL_ADJ

µA

source

(TJ = −40°C to 125°C)

3.0

7.0

VADJ = 11.5 V

9

Current limit one shot off

TONMIN_CLCL

VISNS = 11.0 V

µs

time

(TJ = −40°C to 125°C)

6

14

VFB = 1.0 V

Source

5.5

ISOURCE = 100 mA

RPGATE

Driver resistance

Ω

Sink

8.5

ISink = 100 mA

Source

VIN = 7 V,

0.44

PGATE = 3.5 V

IPGATE

Driver output current

A

Sink

VIN = 7 V,

0.32

PGATE = 3.5 V

VFB = 1.0 V

300

IFB

FB pin bias current(5)

nA

(TJ = −40°C to 125°C)

750

Minimum on time in normal

VISNS = VADJ + 0.1 V

TONMIN_NOR

100

ns

operation

Cload on OUT = 1000 pF

(6)

VISNS = VADJ + 0.1 V

Minimum on time in current

T

VFB = 1.0 V

175

ns

limit

Cload on OUT = 1000 pF

(6)

Feedback voltage line

%VFB/ΔVIN

4.5

≤ VIN ≤ 35 V

0.010%

regulation

(1)

All limits are at room temperature unless otherwise specified. All room temperature limits are 100% tested. All limits at temperature

extremes are specified 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)

VCL = ICL_ADJ × RADJ

(5)

Bias current flows out from the FB pin.

(6)

A 1000-pF capacitor is connected between VIN and PGATE.

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