LM25019_16 datasheet(6/28 Pages) TI1

Il numero della parte	LM25019

Spiegazioni elettronici	100-mA Constant On-Time Synchronous Buck Regulator

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Produttore elettronici	TI1 [Texas Instruments]

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LM25019

SNVS952E – DECEMBER 2012 – REVISED NOVEMBER 2015

www.ti.com

6.5 Electrical Characteristics

Typical values correspond to TJ = 25°C. Minimum and maximum limits apply over –40°C to 125°C junction temperature range

unless otherwise stated. VIN = 48V unless stated otherwise. See

(1).

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNIT

VCC SUPPLY

VCC Reg

VCC Regulator Output

VIN = 48 V, ICC = 20 mA

6.25

7.6

8.55

V

VCC Current Limit

VIN = 48 V

(2)

26

mA

VCC Undervoltage Lockout Voltage

4.15

4.5

4.9

V

(VCC Increasing)

VCC Undervoltage Hysteresis

300

mV

VCC Drop Out Voltage

VIN = 9 V, ICC = 20 mA

2.3

V

IIN Operating Current

Nonswitching, FB = 3 V

1.75

mA

IIN Shutdown Current

UVLO = 0 V

50

225

µA

SWITCH CHARACTERISTICS

Buck Switch RDS(ON)

ITEST = 100 mA, BST-SW = 7 V

0.8

1.8

Ω

Synchronous RDS(ON)

ITEST = 200 mA

0.45

1

Ω

Gate Drive UVLO

VBST − VSW Rising

2.4

3

3.6

V

Gate Drive UVLO Hysteresis

260

mV

CURRENT LIMIT

Current Limit Threshold

150

270

370

mA

Current Limit Response Time

Time to Switch Off

150

ns

Off-Time Generator (Test 1)

FB = 0.1 V, VIN = 48 V

12

µs

Off-Time Generator (Test 2)

FB = 1 V, VIN = 48 V

2.5

µs

REGULATION AND OVERVOLTAGE COMPARATORS

Internal Reference Trip Point for Switch

FB Regulation Level

1.2

1.225

1.25

V

ON

FB Overvoltage Threshold

Trip Point for Switch OFF

1.62

V

FB Bias Current

60

nA

UNDERVOLTAGE SENSING FUNCTION

UV Threshold

UV Rising

1.19

1.225

1.26

V

UV Hysteresis Input Current

UV = 2.5 V

–10

–20

–29

µA

Remote Shutdown Threshold

Voltage at UVLO Falling

0.32

0.66

V

Remote Shutdown Hysteresis

110

mV

THERMAL SHUTDOWN

Tsd

Thermal Shutdown Temperature

165

°C

Thermal Shutdown Hysteresis

20

°C

(1)

All hot and cold limits are specified by correlating the electrical characteristics to process and temperature variations and applying

statistical process control.

(2)

VCC provides self bias for the internal gate drive and control circuits. Device thermal limitations limit external loading.

6.6 Switching Characteristics

Typical values correspond to TJ = 25°C. Minimum and maximum limits apply over –40°C to 125°C junction temperature range

unless otherwise stated. VIN = 48 V unless otherwise stated.

MIN

TYP

MAX

UNIT

ON-TIME GENERATOR

TON Test 1

VIN = 32 V, RON = 100 kΩ

270

350

460

ns

TON Test 2

VIN = 48 V, RON = 100 kΩ

188

250

336

ns

TON Test 4

VIN = 10 V, RON = 250 kΩ

1880

3200

4425

ns

MINIMUM OFF-TIME

Minimum Off-Timer

FB = 0 V

144

ns

6

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