LM25019 datasheet(4/18 Pages) TI

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LM25019

SNVS952 – DECEMBER 2012

www.ti.com

Electrical Characteristics

Specifications with standard typeface are for TJ = 25°C, and those with boldface type apply over full Operating Junction

Temperature range. VIN = 48V, unless otherwise stated. See

(1).

Symbol

Parameter

Conditions

Min

Typ

Max

Units

VCC Supply

VCC Reg

VCC Regulator Output

VIN = 48V, ICC = 20mA

6.25

7.6

8.55

VCC Current Limit

VIN = 48V

(2)

VCC Undervoltage Lockout Voltage

4.15

4.5

4.9

(VCC Increasing)

VCC Undervoltage Hysteresis

300

VCC Drop Out Voltage

VIN = 9V, ICC = 20mA

2.3

IIN Operating Current

Non-Switching, FB = 3V

1.75

IIN Shutdown Current

UVLO = 0V

225

µA

Switch Characteristics

Buck Switch RDS(ON)

ITEST = 100mA, BST-SW =

0.8

1.8

Ω

Synchronous RDS(ON)

ITEST = 200mA

0.45

Ω

Gate Drive UVLO

VBST − VSW Rising

2.4

3.6

Gate Drive UVLO Hysteresis

260

Current Limit

Current Limit Threshold

150

270

370

Current Limit Response Time

Time to Switch Off

150

Off-Time Generator (Test 1)

FB = 0.1V, VIN = 48V

µs

Off-Time Generator (Test 2)

FB = 1V, VIN = 48V

2.5

µs

On-Time Generator

TON Test 1

VIN = 32V, RON = 100k

270

350

460

TON Test 2

VIN = 48V, RON = 100k

188

250

336

TON Test 4

VIN = 10V, RON = 250k

1880

3200

4425

Minimum Off-Time

Minimum Off-Timer

FB = 0V

144

Regulation and Overvoltage Comparators

FB Regulation Level

Internal Reference Trip Point

1.2

1.225

1.25

for Switch ON

FB Overvoltage Threshold

Trip Point for Switch OFF

1.62

FB Bias Current

Undervoltage Sensing Function

UV Threshold

UV Rising

1.19

1.225

1.26

UV Hysteresis Input Current

UV = 2.5V

-10

-20

-29

µA

Remote Shutdown Threshold

Voltage at UVLO Falling

0.32

0.66

Remote Shutdown Hysteresis

110

Thermal Shutdown

Tsd

Thermal Shutdown Temp.

165

°C

Thermal Shutdown Hysteresis

°C

Thermal Resistance

Junction to Ambient

PSOP-8

°C/W

θJA

LLP-8

°C/W

(1)

All electrical characteristics having room temperature limits are tested during production at TA = 25°C. 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.

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