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L4941

L4941
L4941

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January 2004s

LOW DROPOUT VOLTAGE (450mV Typ.at 1A)

s VERY LOW QUIESCENT CURRENT s THERMAL SHUTDOWN s SHORT CIRCUIT PROTECTION s

REVERSE POLARITY PROTECTION

DESCRIPTION

The L4941is a three terminal 5V positive regulators available in TO-220,TO-220FP and D 2PAK packages,making it useful in a wide range of industrial and consumer applications.Thanks to its very low input/output voltage drop,these devices are particularly suitable for battery powered equipments,reducing consumption and prolonging battery life.It employs internal current limiting,antisaturation circuit,thermal shut-down and safe area protection.

L4941

VERY LOW DROP 1A

REGULATOR

L4941

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ABSOLUTE MAXIMUM RATINGS

Absolute Maximum Ratings are those values beyond which damage to the device may occur.Functional operation under these condition is not implied.

THERMAL DATA

CONNECTION DIAGRAM (top view)

ORDERING CODES

(*)Available in Tape &Reel with the suffix "-TR".

Symbol Parameter

Value Unit V I Forward Input Voltage

30V V IR Reverse Input Voltage (R O =100?)-15

V I O Output Current Internally Limited mA P D Power Dissipation

Internally Limited mW T stg Storage Temperature Range

-40to +150°C T op

Operating Junction Temperature Range

-40to +150

°C

Symbol Parameter

TO-220TO-220FP

D 2PAK DPAK Unit R thj-case Thermal Resistance Junction-case 3538°C/W R thj-amb

Thermal Resistance Junction-ambient

50

60

62.5

100

°C/W

ORDERING CODE

PACKAGE L4941BV TO-220L4941BP TO-220FP L4941BD2T D 2PAK L4941BDT (*)

DPAK

L4941

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TEST CIRCUITS Figure 1:DC Parameter

Figure 2:Load Rejection

Figure 3:Ripple

Rejection

L4941

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ELECTRICAL CHARACTERISTICS (Refer to test circuit,V I =7V,C I =0.1μF,C O =22μF,T J =25°C,unless otherwise specified.)

TYPICAL CHARACTERISTICS

Figure 4:Dropout Voltage vs Output Current

Figure 5:Dropout Voltage vs Temperature

Symbol Parameter

Test Conditions

Min.Typ.Max.Unit V O Output Voltage I O =5mA to 1A

V I =6to 14V

4.8

5

5.2V V I Input Voltage I O =5mA 16V ?V O Line Regulation V I =6to 16V I O =5mA

520mV ?V O Load Regulation I O =5mA to 1A 820mV

I O =0.5A to 1A 515mV I q Quiescent Current I O =5mA V I =6V 48mA I O =1A V I =6V 20

40mA ?I q Quiescent Current Change I O =5mA V I =6to 14V 3mA I O =1A V I =6to 14V

-10mA V d

Dropout Voltage

I O =0.5A 250450mV I O =1A

450700

mV ?V O /?T Output Voltage Drift 0.6mv/°C SVR Supply

Voltage Rejection f =120Hz I O =1A

58

68dB I sc Short Circuit Current V I =14V 1.6 2.0A

V I =6V 1.8 2.2

Z O Output Impedance f =1KHz

I O =0.5A

30m ?e N

Output Noise Voltage

B =100Hz to 100KHz

30

μV/V O

L4941

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Figure 6:Output Voltage vs Temperature

Figure 7:Quiescent Current vs Temperature Figure 8:Quiescent Current vs Input Voltage

Figure 9:Quiescent Current vs Output Current

Figure 10:Short Circuit Current vs Temperature

Figure 11:Peak Output Current vs Input/Output Differential

Voltage

L4941

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Figure 12:Low Voltage Behavior

Figure 13:Supply Voltage Rejection vs Frequency

Figure 14:Supply Voltage Rejection vs Output Current

Figure 15:Load Dump Characteristics

Figure 16:Line Transient Response

Figure 17:Total Power

Dissipation

L4941

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Figure 18:Load transient Response

Figure 19:Distributed Supply with On-card L4940and L4941low drop

regulator

L4941

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Figure 20:Distributed Supply with On-card L4940and L4941low drop regulator

ADVANTAGES OTF THESE APPLICATION ARE:

On card regulation with short-circuit and thermal protection on each output.

Vary high total system efficency due to the switching preregulation and very low-drop

postregulation

L4941

Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.

The ST logo is a registered trademark of STMicroelectronics

All other names are the property of their respective owners

? 2004 STMicroelectronics - All Rights Reserved

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