BL2940

BL2940 BELLING | Alldatasheet

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www.belling.com.cn V1.1 Page1 1A Low-Dropout Regulator BL2940

DESCRIPTION

The BL2940 positive voltage regulator features the ability to source 1A of output current with a dropout voltage of typically 0.5V and a maximum of 1V over the entire temperatur e range. Furthermore, a quiescent current reduction circuit has been included which reduces the ground current when the differential between the input voltage and the output voltage exceeds approximately 3V. The quiescent current with 1A of output current and an input-output differential of 5V is therefore only 30 mA. Higher quiescent currents only exist when the r egulator is in the dropout mode (V IN − V OU T ≤ 3V). Designed also for vehicular applications, the BL2940 and all regulated circuitry are protected from reverse battery installations or 2-battery jumps. During line transients, such as load dump when the input voltage can momentarily exceed the specified maximum operating voltage, the regulator will automatically shut down to protect both the internal circuits and the load. The BL2940 cannot be harmed by temporary mirror-ima ge insertion. Familiar regulator features such as short circuit and thermal overload protection are also provided.

FEATURES

/circle6 Dropout voltage typically 0.5V @I O = 1A /circle6 Output current in excess of 1A /circle6 Output voltage trimmed before assembly /circle6 Reverse battery protection /circle6 Internal short circuit current limit /circle6 Mirror image insertion protection /circle6 P+ Product Enhancement tested SOT223 TO-252 TO-220 TO-263

www.belling.com.cn V1.1 Page2 PIN CONFIGURATION SOT223 TO-252 TO-220 TO-263 BLOCK DIAGRAM

www.belling.com.cn V1.1 Page3 ABSOLUTE MAXIMUM RATINGS (Ta=25 ℃) *1 Characteristic Limit Unit Surge Supply voltage(t ≤100ms) 60 V Input Voltage 26 V Internal power dissipation Internally Limited Maximum junction temperature 150 ℃ Storage temperature range -65 ~ +150 ℃ ESD susceptibility （HBM ） 2 kV

ELECTRICAL CHARACTERISTICS

(V IN =V O +5V, I O =1A, C O =22 µF, TA = 25 ℃ unless otherwise specified. ) 5V 8V Characteristic Conditions Min. Typ. Max Min. Typ. Max Unit 6.25V ≤V IN ≤26V 9.4V ≤V IN ≤26V Output voltage 5mA ≤IO ≤1A V Line regulation V O +2V ≤V I N ≤26V IO =5mA 20 50 20 80 mV Load regulation 50mA ≤IO ≤1A 35 50 55 80 mV Output impedance 100mADC and 20mArms, f O =120Hz 35 55 m Ω V O +2V ≤V I N ≤26V IO =5mA 10 15 10 15 mA Quiescent current V I N =V O +5V IO =1A 30 45 30 45 mA Output noise voltage 10Hz-100kHz, I O =5mA 150 240 µVrms fO =120Hz,1Vrms IO =100mA 60 72 54 66 Ripple rejection fO =1kHz,1Vrms IO =5mA 60 54 dB Long term stability 20 32 mV/ 1000Hr IO =1A 0.5 0.8 0.5 0.8 V M AX Dropout voltage IO =100mA 110 150 110 150 mV MAX Short circuit current 1.6 1.9 1.6 1.9 A Maximum line transient R O =100 Ω T ≤100ms 60 75 60 75 V Reverse polarity DC input voltage R O =100 Ω -30 -15 -30 -15 V Reverse polarity transient input voltage R O =100 Ω T ≤100ms -75 -50 -75 -50 V

www.belling.com.cn V1.1 Page4 (V IN =V O +5V, I O =1A, C O =22 µF, TA = 25 ℃ unless otherwise specified. ) 9V 10V Characteristic Conditions Min. Typ. Max Min. Typ. Max Unit Line regulation V O +2V ≤V I N ≤26V IO =5mA 20 90 20 100 mV Load regulation 50mA ≤IO ≤1A 60 90 65 100 mV Output impedance 100mADC and 20mArms, f O =120Hz 60 65 m Ω V O +2V ≤V I N ≤26V IO =5mA 10 15 10 15 mA Quiescent current V I N =V O +5V IO =1A 30 45 30 45 mA Output noise voltage 10Hz-100kHz, I O =5mA 270 300 µVrms Ripple rejection fO =120Hz,1Vrms IO =100mA 52 64 51 63 dB Long term stability 34 36 mV/ 1000Hr IO =1A 0.5 0.8 0.5 0.8 V Dropout voltage IO =100mA 110 150 110 150 mV Short circuit current 1.6 1.9 1.6 1.9 A Maximum line transient R O =100 Ω T ≤100ms 60 75 60 75 V Reverse polarity DC input voltage R O =100 Ω -30 -15 -30 -15 V Reverse polarity transient input voltage R O =100 Ω T ≤100ms -75 -50 -75 -50 V

www.belling.com.cn V1.1 Page5 (V IN =V O +5V, I O =1A, C O =22 µF, TA = 25 ℃ unless otherwise specified. ) 12V 15V Characteristic Conditions Min. *5 Typ. Max Min. *5 Typ. Max Unit Line regulation V O +2V ≤V I N ≤26V IO =5mA 20 120 20 150 mV Load regulation 50mA ≤IO ≤1A 55 120 mV Output impedance 100mADC and 20mArms, f O =120Hz 80 100 m Ω V O +2V ≤V I N ≤26V IO =5mA 10 15 mA Quiescent current V I N =V O +5V IO =1A 30 45 30 45 mA Output noise voltage 10Hz-100kHz, I O =5mA 360 450 µVrms fO =120Hz,1Vrms IO =100mA 54 66 Ripple rejection fO =1kHz,1Vrms IO =5mA dB Long term stability 48 60 mV/ 1000Hr IO =1A 0.5 0.8 0.5 0.8 V Dropout voltage IO =100mA 110 150 110 150 mV Short circuit current 1.6 1.9 1.6 1.9 A Maximum line transient R O =100 Ω T ≤100ms 60 75 60 75 V Reverse polarity DC input voltage R O =100 Ω -30 -15 -30 -15 V Reverse polarity transient input voltage R O =100 Ω T ≤100ms -75 -50 -75 -50 V

www.belling.com.cn V1.1 Page6 APPLICATION SUMMARY External Capacitors The output capacitor is critical to maintaining regulator stability, and must meet the required conditions for both ESR(Equivalent Series Resistance) and minimum amount of capacitance. MINIMUM CAPACITANCE: The minimum output capacitance required to maintain stability is 22 µF (this value may be increased without limit). Larger values of output capacitance will give improved transient response. ESR LIMITS: The ESR of the output capacitor will cause loop instability if it is too high or too low. The acceptable range of ESR plotted versus load current is shown in the graph right. It is essential that the output capacitor meet these requirements, or oscillations can result. Fig. ESR Limits It is important to note that for most capacitors, ESR is specified only at room temperature. However, the designer must ensure that the ESR will stay inside the limits shown over the entire operating temperature range for the design. For aluminum electrolytic capacitors, ESR will increase by about 30X as the temperature is reduced from 25°C to −40°C. This type of capacitor is not well-suited for low temperature operation. Solid tantalum capacitors have a more stable ESR ov er temperature, but are more expensive than aluminum electrolytics. A cost-effective approach sometimes used is to parallel an aluminum electrolytic with a solid Tantalum, with the total capacitance split about 75/25% with the Aluminum being the larger value. If two capacitors are paralleled, the effective ESR is the parallel of the two individual values. The “flatter” ESR of the Tantalum will keep the effective ESR from rising as quickly at low temperatures.

www.belling.com.cn V1.1 Page7 CHARACTERISTICS CURVE

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www.belling.com.cn V1.1 Page11 OUTLINE DRAWING TO-252 Unit: mm

www.belling.com.cn V1.1 Page12 SOT-223 Unit: mm TO-220 Unit: mm

www.belling.com.cn V1.1 Page13 TO-263 Unit: mm