LM2841 datasheet(3/19 Pages) TI1

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LM2841, LM2842

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SNVS540H – MARCH 2009 – REVISED APRIL 2013

Absolute Maximum Ratings

(1) (2)

VIN

-0.3V to +45V

SHDN

-0.3V to (VIN+0.3V) <45V

SW Voltage

-0.3V to +45V

CB Voltage above SW Voltage

FB Voltage

-0.3V to +5V

Maximum Junction Temperature

150°C

Power Dissipation(3)

Internally Limited

Lead Temperature

300°C

Vapor Phase (60 sec.)

215°C

Infrared (15 sec.)

220°C

ESD Susceptibility(4)

Human Body Model

2 kV

(1)

Absolute maximum ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions for which the

device is intended to be functional, but device parameter specifications may not be ensured. For ensured specifications and test

conditions, see the Electrical Characteristics.

(2)

If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and

specifications.

(3)

The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(MAX), the junction-to-ambient thermal

resistance,

θJA, and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated

using: PD (MAX) = (TJ(MAX) − TA)/θJA. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and

the regulator will go into thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent damage. Thermal

shutdown engages at TJ=175°C (typ.) and disengages at TJ= 155°C (typ).

(4)

Human Body Model, applicable std. JESD22-A114-C.

Operating Conditions

Operating Junction Temperature Range (1)

−40°C to +125°C

Storage Temperature

−65°C to +150°C

Input Voltage VIN

4.5V to 42V

SW Voltage

Up to 42V

(1)

All limits specified at room temperature (standard typeface) and at temperature extremes (bold typeface). All room temperature limits are

100% production tested. All limits at temperature extremes are ensured via correlation using standard Statistical Quality Control (SQC)

methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).

Electrical Characteristics

Specifications in standard type face are for TJ = 25°C and those with boldface type apply over the full Operating

Temperature Range ( TJ = −40°C to +125°C). Minimum and Maximum limits are specified through test, design, or statistical

correlation. Typical values represent the most likely parametric norm at TJ = +25°C, and are provided for reference purposes

only. Unless otherwise stated the following conditions apply: VIN = 12V.

Symbol

Parameter

Conditions

Min (1)

Typ (2)

Max (1)

Units

Quiescent current

SHDN = 0V

µA

Device On, Not Switching

1.30

1.75

Device On, No Load

1.35

1.85

RDSON

Switch ON resistance

See(3)

0.9

1.6

Ω

ILSW

Switch leakage current

VIN = 42V

0.0

0.5

µA

ICL

Switch current limit

LM2840 (4)

525

900

LM2841 (4)

525

900

LM2842 (4)

1.15

1.7

IFB

Feedback pin bias current

LM2840/41/42 (5)

0.1

1.0

µA

VFB

FB Pin reference voltage

0.747

0.765

0.782

(1)

All limits specified at room temperature (standard typeface) and at temperature extremes (bold typeface). All room temperature limits are

100% production tested. All limits at temperature extremes are ensured 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)

Includes the bond wires, RDSON from VIN pin to SW pin.

(4)

Current limit at 0% duty cycle. May be lower at higher duty cycle or input voltages below 6V.

(5)

Bias currents flow into pin.

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