LM5642, LM5642X

www.ti.com

SNVS219K – JUNE 2003 – REVISED APRIL 2013

ELECTRICAL CHARACTERISTICS

Unless otherwise specified, VIN = 28V, GND = PGND = 0V, VLIN5 = VDD1 = VDD2. Limits appearing in boldface type apply

over the specified operating junction temperature range, (-40°C to +125°C, if not otherwise specified). Specifications

appearing in plain type are measured using low duty cycle pulse testing with TA = 25°C

(1), (2). Min/Max limits are specified by

design, test, or statistical analysis.

Symbol

Parameter

Conditions

Min

Typ

Max

Units

System

ΔVOUT/VOUT

Load Regulation

VIN = 28V, Vcompx = 0.5V to 1.5V

0.04

%

Line Regulation

5.5V

≤ VIN ≤ 36V, Vcompx =1.25V

0.04

%

VFB1_FB2

Feedback Voltage

5.5V

≤ VIN ≤ 36V

1.2154

1.2364

1.2574

V

-20°C to 85°C

1.2179

1.2364

1.2549

IVIN

Input Supply Current

VON_SSx > 2V

1.1

2.0

mA

5.5V

≤ VIN ≤ 36V

Shutdown (3)

50

110

µA

VON_SS1 = VON_SS2= 0V

VLIN5

VLIN5 Output Voltage

IVLIN5 = 0 to 25mA,

4.70

5

5.30

V

5.5V

≤ VIN ≤ 36V

VCLos

Current Limit Comparator

VIN = 6V

±2

±7.0

mV

Offset (VILIMX

−VRSNSX)

ICL

Current Limit Sink Current

8.4

9.9

11.4

µA

Iss_SC1,

Soft-Start Source Current

VON_ss1 = VON_ss2 = 1.5V (on)

0.5

2.4

5.0

µA

Iss_SC2

Iss_SK1,

Soft-Start Sink Current

VON_ss1 = VON_ss2 = 1.5V

2

5.5

10

µA

Iss_SK2

VON_SS1,

Soft-Start On Threshold

0.7

1.12

1.4

V

VON_SS2

VSSTO

Soft-Start Timeout

(4)

3.4

V

Threshold

Isc_uvdelay

UV_DELAY Source Current

UV-DELAY = 2V

2

5

9

µA

Isk_uvdelay

UV_DELAY Sink Current

UV-DELAY = 0.4V

0.2

0.48

1.2

mA

VUVDelay

UV_DELAY Threshold

2.3

V

Voltage

VUVP

FB1, FB2, Under Voltage

As a percentage of nominal output voltage

75

80.7

86

%

Protection Latch Threshold

(falling edge)

Hysteresis

3.7

%

VOVP

VOUT Overvoltage

As a percentage measured at VFB1, VFB2

107

114

122

%

Shutdown Latch Threshold

Swx_R

SW1, SW2 ON-Resistance

VSW1 = VSW2 = 0.4V

420

487

560

Ω

(1)

A typical is the center of characterization data measured with low duty cycle pulse tsting at TA = 25°C. Typicals are not ensured.

(2)

All limits are specified. All electrical characteristics having room-temperature limits are tested during production with TA = TJ = 25°C. All

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

process control.

(3)

Both switching controllers are off. The linear regulator VLIN5 remains on.

(4)

When SS1 and SS2 pins are charged above this voltage and either of the output voltages at Vout1 or Vout2 is still below the regulation

limit, the under voltage protection feature is initialized.

Copyright © 2003–2013, Texas Instruments Incorporated

Submit Documentation Feedback

5

Product Folder Links: LM5642 LM5642X