LM2642 datasheet(5/31 Pages) TI1

Part #	LM2642

Description	Two-Phase Synchronous Step-Down Switching Controller

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Manufacturer	TI1 [Texas Instruments]

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LM2642

www.ti.com

SNVS203I – MAY 2002 – REVISED APRIL 2013

ELECTRICAL CHARACTERISTICS

Unless otherwise specified, VIN = 15V, GND = PGND = 0V, VLIN5 = VDD1 = VDD2. Limits appearing in boldface type apply

over the specified operating junction temperature range, (-20°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 = 15V, Vcompx = 0.5V to 1.5V

0.04

%

ΔVOUT/VOUT

Line Regulation

5.5V

≤ VIN ≤ 30V, Vcompx =1.25V

0.04

%

VFB1_FI2

Feedback Voltage

5.5V

≤ VIN ≤ 30V

1.215

1.238

1.260

0°C to 125°C

1.217

1.259

V

-40°C to 125°C

1.212

1.261

IVIN

Input Supply Current

VON_SSx > 2V

1.0

mA

5.5V

≤ VIN ≤ 30V

2.0

Shutdown (3)

37

µA

VON_SS1 = VON_SS2= 0V

110

VLIN5

VLIN5 Output Voltage (4)

IVLIN5 = 0 to 25mA,

4.70

5

5.30

5.5V

≤ VIN ≤ 30V

V

-40°C to 125°C

4.68

5.30

VCLos

Current Limit Comparator

±2

±7.0

mV

Offset (VILIMX

−VRSNSX)

ICL

Current Limit Sink Current

9

10

11

µA

-40°C to 125°C

8.67

11

Iss_SC1,

Soft-Start Source Current

VON_ss1 = VON_ss2 = 1.5V (on)

0.5

2

5.0

µA

Iss_SC2

Iss_SK1,

Soft-Start Sink Current

VON_ss1 = VON_ss2 = 2V

2

5.2

10

µA

Iss_SK2

VON_SS1,

Soft-Start On Threshold

0.7

1.12

1.4

V

VON_SS2

VSSTO

Soft-Start Timeout

(5)

3.3

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

86

%

Protection Latch Threshold

(falling edge)

Hysteresis

4

%

VOVP

VOUT Overvoltage

As a percentage measured at VFB1, VFB2

107

113

122

%

Shutdown Latch Threshold

Vpwrbad

Regulator Window Detector

As a percentage of output voltage

Thresholds (PGOOD1 from

86.5

90.3

94.5

%

High to Low)

Vpwrgd

Regulator Window Detector

Thresholds (PGOOD1 from

91.5

94

97.0

%

Low to High)

Swx_R

SW1, SW2 ON-Resistance

VSW1 = VSW2 = 2V

420

480

535

Ω

Gate Drive

ICBOOT

CBOOTx Leakage Current

VCBOOT1 = VCBOOT2 = 7V

10

nA

(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)

The output voltage at the VLIN5 pin may be as high as 5.9V in shutdown mode (ON/SS1 = ON/SS2 = 0V).

(5)

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.

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