Voltage Regulators AN6531 4-pin variable positive output voltage regulator ■ Overview Unit : mm The AN6531 is a monolithic 4-pin variable positive output voltage regulator. With an external resistor, it provides any stabilized output voltages between 5V and 30V, and is optimum for the power circuits with a current capacity of up to 0.5A. This IC incorporates various protection circuits. 9.6+0.5 –0.1 2.0 12.5 max. 4.0 φ3.1 ■ Features 9.0 min. 3–1.0 1.8 • Wide range of output voltages: VO = 5 to 30V • Built-in thermal overload protection circuit • Built-in overcurrent protection circuit • Built-in ASO (area of safe operation) protection circuit 0.7±0.2 0.5±0.1 1.5 1.3 3.3 max. 2.3 2.3 2.3 SSIP004-P-0000 ■ Block Diagram RSC Output Pass Tr Short Circuit Protection 1 2 Ref. Voltage + Error Amp. − Thermal Protection 3 Control Common Input Start Circuit Current Source 4 Output 1 AN6531 Voltage Regulators ■ Absolute Maximum Ratings at Ta = 25°C Parameter Symbol Rating VCC ICC * 40 1.5 A Power dissipation PD 7.5 W Operating ambient temperature Topr −20 to +75 °C Storage temperature Tstg −55 to +150 °C Supply voltage Supply current * Unit V The internal circuit is provided with a current limiting circuit. ■ Electrical Characteristics at Ta = 25°C Parameter Output voltage tolerance Line regulation Load regulation Symbol VO REGIN REGL Conditions VI = VO+3V to VO+15V, IO = 5 to 350mA, Tj = 25°C VO = 5V, IO = 200mA, VI = 7.5 to 25V, Tj = 25°C VO = 18V, IO = 5mA, VI = 21 to 33V, Tj = 25°C VO = 18V, IO = 200mA, VI = 21 to 25V, Tj = 25°C VO = 5V, VI = 12V, IO = 5 to 500mA, Tj = 25°C Min Typ Max Unit 4 % 1 % 0.75 % 0.67 % 1 % Bias current IBias Tj = 25°C 3 5 mA Control pin current Icont Tj = 25°C 1 8 µA Ripple rejection ratio RR VI = 8 to 18V, VO = 5V, f = 120Hz Output noise voltage Vno VO = 5V, f = 10Hz to 100kHz Minimum input/output voltage difference VDIF(min) Output short-circuit current IOS Peak output current IOP Output voltage temperature coefficient Control pin voltage ∆VO/Ta Vcont 62 IO = 500mA, Tj = 25°C VO = 5V, Tj = 25°C Tj = −55 to +25°C IO = 5mA Tj = 25 to 150°C Tj = 25°C dB µV 2 VI = 35V, VO = 5V, Tj = 25°C VO = 5V 80 40 0.4 V 50 600 mA 1 1.4 A 0.5 mV/°C − 0.5 4.8 5 5.2 V Note 1) The specified condition Tj = 25°C means that the test should be carried out within so short a test time (within 10ms) that the characteristic value drift due to the chip junction temperature rise can be ignored. Note 2) Unless otherwise specified, VI = 10V, VO = 5V, IO = 350mA, CI = 0.33µF, CO = 0.1µF 2 Voltage Regulators AN6531 Peak output current IOP (A) 1.2 (1) 6 (2) 4 (3) 2 0 20 40 60 Tj = 0°C 0.6 125°C 0.4 0 80 100 120 140 160 25°C 0 4 8 12 16 20 24 28 32 Input/output voltage difference VDIF (V) RR f Transient response to input variation VI = 8 to 18V VO = 5V IO = 20mA 15 Output voltage fluctuation (mV) 100 80 60 40 20 0 10 100 1k 10k 100k 1M 10 5 10 0 −10 −20 0 2 4 Frequency f (Hz) 8 10 2.4 2.0 IO = 500mA 200mA 1.6 100mA 1.2 10mA 0mA 0.8 0.4 −80 −40 0 40 80 120 160 200 240 Junction temperature Tj (°C) Transient response to load variation 1.0 0.5 0 0.5 0 −0.5 −1.0 0 20 40 60 80 100 Time t (µs) ZO f Current limiting characteristic 104 6 4 Output impedance ZO (mΩ) 5 Output voltage VO (V) 6 Time t (µs) Input voltage VI (V) Ambient temperature Ta (°C) 120 Ripple rejection ratio RR (dB) 0.8 0.2 (4) 0 1.0 VDIF(min) Tj 2.8 Load current IL (A) (1) TC = Ta (2) With a 10°C/W heat sink (3) With a 20°C/W heat sink (4) Without heat sink 8 Power dissipation PD (W) IO(peak) VDIF 1.4 Output voltage fluctuation (V) PD Ta 10 Minimum input/output voltage difference VDIF(min) (V) ■ Main Characteristics VI = 10V VO = 5V Tj = 25°C 3 2 1 VI = 10V VO = 5V IO = 20mA CO = 0.1µF Ta = 25°C 103 102 10 0 0 0.2 0.4 0.6 0.8 1.0 Output current IO (A) 1.2 10 100 1k 10k 100k 1M Frequency f (Hz) 3 AN6531 Voltage Regulators ■ Basic Regulator Circuit 3 +V1 4 Input Output AN6531 CI 0.33µF +VO 1 Cont Common 2 Vcont R1 R1 + R 2 R1 (Vcont ≅ 5V, R1 = 5kΩ) CI is necessary when the VI line is long. CO improves the transient response. VO = Vcont R2 CO 0.1µF ■ Application Circuit Examples 1. Current bootstrap circuit 2. Current bootstrap circuit (with current limiting circuit) Q1 VI Ie1 RSC VI Q1 Ie2 R3 6Ω 3 Input IR IP AN6531 0.33µF Cont Common 2 R3 = IO Output 4 VBE(Q1) · β (β + 1) IP − IO 6Ω VO 0.1µF 5kΩ 3 IP Input Output AN6531 Cont 0.33µF R1 RSC = R3 = Common 2 VBE(Q2) Ie1(max) VBE(Q1) + Ie1RSC IO − Ie1 Ie2(max) = IP(max) − 4 Q2 IR R2 1 R3 VBE(Q1) + VBE(Q2) R3 IO 4 VO R2 1 0.1µF 5kΩ R1 Request for your special attention and precautions in using the technical information and semiconductors described in this material (1) An export permit needs to be obtained from the competent authorities of the Japanese Government if any of the products or technologies described in this material and controlled under the "Foreign Exchange and Foreign Trade Law" is to be exported or taken out of Japan. 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