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L4921 Dataheets PDF



Part Number L4921
Manufacturers STMicroelectronics
Logo STMicroelectronics
Description VERY LOWDROP ADJUSTABLE REGULATORS
Datasheet L4921 DatasheetL4921 Datasheet (PDF)

® L4920 L4921 VERY LOW DROP ADJUSTABLE REGULATORS . . . . . . . . VERY LOW DROP VOLTAGE ADJUSTABLE OUTPUT VOLTAGE FROM 1.25V TO 20V 400mA OUTPUT CURRENT LOW QUIESCENT CURRENT REVERSE VOLTAGE PROTECTION + 60/ − 60V TRANSIENT PEAK VOLTAGE PROTECTION SHORT CIRCUIT PROTECTION WITH FOLDBACK CHARACTERISTICS THERMAL SHUT-DOWN Pentaw att DESCRIPTION The L4920 and L4921 are adjustable voltage regulators with a verylow voltage drop (0.4V typ. at 0.4A Tj = 25°C), low quiescent current and comprehensiv.

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® L4920 L4921 VERY LOW DROP ADJUSTABLE REGULATORS . . . . . . . . VERY LOW DROP VOLTAGE ADJUSTABLE OUTPUT VOLTAGE FROM 1.25V TO 20V 400mA OUTPUT CURRENT LOW QUIESCENT CURRENT REVERSE VOLTAGE PROTECTION + 60/ − 60V TRANSIENT PEAK VOLTAGE PROTECTION SHORT CIRCUIT PROTECTION WITH FOLDBACK CHARACTERISTICS THERMAL SHUT-DOWN Pentaw att DESCRIPTION The L4920 and L4921 are adjustable voltage regulators with a verylow voltage drop (0.4V typ. at 0.4A Tj = 25°C), low quiescent current and comprehensive on-chip protection. Thesedevices are protectedagainst load dump and field decay transients, polarity reversal and over heating. A foldbackcurrent limiter protectsagainstload short circuits. The outputvoltage is adjustablethrough an external divider from 1.25V to 20V. The minimum operating input voltage is 5.2V (TJ = 25°C). BLOCK DIAGRAM Minidip (4 + 4) ORDERING NUMBERS : L4920 (Pentawatt) L4921 (Minidip) These regulators are designed for automotive, industrial and consumer applications where low consumption is particularly important. In battery backup and standby applications the low consumption of these devices extends battery life. June 2000 1/7 L4920/L4921 ABSOLUTE MAXIMUM RATINGS Symbol Vi Parameter DC Input Operating Voltage DC Reverse Input Voltage Transient Input Overvoltages: Load Dump: 5ms ≤ trise ≤ 10ms τf Fall time constant = 100ms R SOURCE ≥ 0.5Ω Field Decay: 5ms ≤ tfall ≤ 10ms, RSOURCE ≥ 10Ω τf Rise time constant = 33ms Value 35 Unit V TJ, TSTG Junction and Storage Temperature Range – 55 to 150 °C PIN CONNECTIONS (top view) TEST AND APPLICATION CIRCUIT C = 100µF is required for stability (ESR ≤ 3Ω over T range) R2 = 6.2KΩ. THERMAL DATA Symbol R th j-amb Rth j-pins Rth j-case Parameter Thermal Resistance Junction-ambient Thermal Resistance Junction-pins Thermal Resistance Junction-case Max Max Max Minidip (4 + 4) 80 °C/W 15 °C/W – Pentawatt 60 °C/W – 3.5 °C/W 2/7 L4920/L4921 ELECTRICAL CHARACTERISTICS (forVI =14.4V,TJ = 25°C, VO = 5V,CO = 100µF, unlessOtherwiseSpecified) Symbol VI VREF ∆V O ∆V O VD Parameter Operating Input Voltage Reference Voltage Line Regulation Load Regulation Dropout Voltage Test Condition VO ≥ 4.5V, IO = 400mA VREF ≤ VO < 4.5V, IO = 400mA 5.2V < VI < 26V 5mA ≤ IO ≤ 400mA (*) VO + 1V < VI < 26V, VO ≥ 4.5V IO = 5mA 5mA ≤ IO ≤ 400mA (*) VO ≥ 4.5V IO = 10mA IO = 150mA IO = 400mA IO = 0mA VO + 1V < VI <26V IO = 400mA (*) VO + 1V < VI <26V IO IOSC Maximal Output Current Short Circuit Output Current (*) Min. VO + 0.7 5.2 1.20 1.25 1 3 0.05 0.2 0.4 0.8 65 800 350 500 Typ. Max. 26 26 1.30 10 15 0.4 0.7 2 90 Unit V V V mV/V mV/V V V V mA mA mA mA IQ Quiescent Current (*) F oldback pr otection ELECTRICAL CHARACTERISTICS (forVI = 14.4V,–40 ≤ TJ ≤ 125°C (note1), VO = 5V, CO = 100µF, unless Otherwise Specified) Symbol VI VREF ∆V O ∆V O VD IQ Parameter Operating Input Voltage Reference Voltage Line Regulation Load Regulation Dropout Voltage Quiescent Current Test Condition VO ≥ 4.5V, IO = 400mA VREF ≤ VO < 4.5V, IO = 400mA 5.4V < VI < 26V VO + 1.2V < VI < 26V, VO ≥ 4.5V IO = 5mA 5mA ≤ IO ≤ 400mA (*) VO ≥ 4.5V IO = 150mA IO = 400mA IO = 0mA VO + 1.2V < VI <26V IO = 400mA (*) VO + 1.2V < VI <26V IO IOSC Maximal Output Current Short Circuit Output Current (*) Min. VO + 0.9 5.2 1.17 1.25 2 5 0.2 0.4 1,2 80 870 230 500 Typ. Max. 26 26 1.33 15 25 0.4 0.7 3 140 Unit V V V mV/V mV/V V V mA mA mA mA (*) Foldback protection. N ote : 1. Design limits are guaranteed (but not 100% production tested) over the indicated temperatu re and supply voltage ranges. These limits are not used to calculate outgoing quality levels. 3/7 L4920/L4921 Figure 1 : Output Voltage vs. Temperature. Figure 2 : Foldback Current Limiting. Figure 3 : Quiescent Current vs. Output Current (Vo = 5V). APPLICATION INFORMATION 1) The L4920 and L4921 have VREF ≅ 1.25V.Then the output voltage can be set down to VREF but Vi must be greater than 5.2V (Tj = 25°C). 2) As the regulator reference voltage source works in closed loop, the reference voltagemay change in foldbackcondition. 3) For applications with high Vl, the total power dissipation of the device with respect to the ther- mal resistance of the packagemay be limiting . The total power dissipation is : Ptot = Vi lq + (Vi - Vo) lo A typical curve giving the quiescent current lq as a function of the output current lo is shown in fig. 3. 4/7 L4920/L4921 DIM. MIN. A a1 B B1 b b1 D E e e3 e4 F I L Z 0.44 0.38 0.7 1.39 0.91 mm TYP. 3.3 0.028 1.65 1.04 0.5 0.5 9.8 8.8 2.54 7.62 7.62 7.1 4.8 3.3 1.6 0.017 0.015 0.055 0.036 MAX. MIN. inch TYP. 0.130 MAX. OUTLINE AND MECHANICAL DATA 0.065 0.041 0.020 0.020 0.386 0.346 0.100 0.300 0.300 0.280 0.189 0.130 0.063 PowerMinidip 5/7 L4920/L4921 mm TYP. inch TYP. DIM. A C D D1 E E1 F F1 G G1 H2 H3 L L1 L2 L3 L4 L5 L6 L7 L9 M M1 V4 MIN. 2.4 1.2 0.35 0.76 0.8 1 3.2 6.6 10.05 17.55 15.55 21.2 22.3 2.6 15.1 6 4.23 3.75 3.4 6.8 17.85 15.75 21.4 22.5 MAX. 4.8 1.37 2.8 1.35 0.55 1.19 1.05 1.4 3.6 7 10.4 10.4 18.15 15.9.


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