AN6531 PANASONIC | Alldatasheet
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4-pin variable positive output voltage regulator I Overview The AN6531 is a monolithic 4-pin variable positive output voltage regulator. With an external resistor, it pro- vides any stabilized output voltages between 5V and 30V, and is optimum for the power circuits with a current ca- pacity of up to 0.5A. This IC incorporates various protec- tion circuits. I Features
- 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 I Block Diagram Unit : mm SSIP004-P-0000 12.5 max. φ3.1 2.0 4.0 3–1.0 0.7±0.2 0.5±0.1 1.8 9.0 min. 3.3 max. 9.6+0.5 –0.1 Control 1234 Error Amp. Common Input Output Output Pass Tr Ref. Voltage Thermal Protection Current Source Start Circuit Short Circuit Protection R SC
I Absolute Maximum Ratings at Ta = 25°C I Electrical Characteristics at Ta = 25°C VCC ICC * PD Topr Tstg V A W Parameter Symbol Rating Unit 1.5 7.5 −20 to +75 −55 to +150 Supply voltage Supply current Power dissipation Operating ambient temperature Storage temperature * The internal circuit is provided with a current limiting circuit. Parameter Symbol Conditions Min Typ Max Output voltage tolerance VO 4%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 Line regulation REGIN 0.75 %VO = 18V, IO = 5mA, VI = 21 to 33V, Tj = 25°C %VO = 18V, IO = 200mA, VI = 21 to 25V, Tj = 25°C mATj = 25°CBias current IBias µA1Tj = 25°C 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 Control pin current Icont dB80VI = 8 to 18V, VO = 5V, f = 120HzRipple rejection ratio RR µVOutput noise voltage Vno VO = 5V, f = 10Hz to 100kHz Minimum input/output voltage difference VDIF(min) mA50 IO = 500mA, Tj = 25°C 600 1.4 0.67 Output short-circuit current IOS VI = 35V, VO = 5V, Tj = 25°C A1VO = 5V, Tj = 25°CPeak output current IOP mV/°C0.5Output voltage temperature coefficient ∆VO/Ta VO = 5V Control pin voltage Vcont Tj = 25°C 5.2 VO = 5V, VI = 12V, IO = 5 to 500mA, Tj = 25°CLoad regulation REGL %1 4.8 0.4 Tj = −55 to +25°C − 0.5IO = 5mA Tj = 25 to 150°C Unit
Time t (µs) −10 −20 Output voltage fluctuation (mV) Input voltage VI (V) Transient response to input variation 0 20 40 60 80 100 120 140 160 Ambient temperature Ta (°C) Power dissipation PD (W) PD Ta (1) TC = Ta (2) With a 10°C/W heat sink (3) With a 20°C/W heat sink (4) Without heat sink (4) (3) (2) (1) 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 4 8 12 16 20 24 28 32 Input/output voltage difference VDIF (V) Peak output current IOP (A) IO(peak) VDIF 125°C Tj = 0°C 25°C 2.8 2.4 2.0 1.6 1.2 0.8 0.4 −80 −40 0 40 80 120 160 200 240 Junction temperature Tj (°C) Minimum input/output voltage difference VDIF(min) (V) Ripple rejection ratio RR (dB) VDIF(min) Tj IO = 500mA 200mA 100mA 10mA 0mA 120 100 10 100 1k 10k 100k 1M Frequency f (Hz) RR f VI = 8 to 18V VO = 5V IO = 20mA 0 2 04 06 08 0 1 0 0 Time t (µs) 0.5 −0.5 −1.0 1.0 0.5 Output voltage fluctuation (V) Load current IL (A) Transient response to load variation Output current IO (A) Output voltage VO (V) Current limiting characteristic 10 100 1k 10k 100k 1M Frequency f (Hz) Output impedance ZO (mΩ) ZO f VI = 10V VO = 5V Tj = 25°C 104 103 102 VI = 10V VO = 5V IO = 20mA CO = 0.1µF Ta = 25°C
I Application Circuit Examples 1. Current bootstrap circuit 2. Current bootstrap circuit (with current limiting circuit) +VO VO = Vcont CI is necessary when the VI line is long. CO improves the transient response. CO 0.1µF0.33µF Vcont CI +V1 AN6531 Cont Input Output Common R1 + R2 (Vcont ≅ 5V, R1 = 5kΩ) VO 0.33µF 0.1µF VI IO IPIR R3 = VBE(Q1) · β (β + 1) IP − IO 5kΩ Cont Input Output Common AN6531 VO 0.33µF 0.1µF VI IO IP IR Ie2 Ie1 RSC = VBE(Q2) Ie1(max) R3 = VBE(Q1) + Ie1RSC IO − Ie1 Ie2(max) = IP(max) − VBE(Q1) + VBE(Q2) RSC R15kΩ Cont Input Output Common AN6531
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