AN1433SSM PANASONIC
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Technical content
1Publication date: December 2001 SFF00002CEB AN1433SSM High accuracy, variable output, low voltage operation shunt regulator I Overview The AN1433SSM is a low voltage operation and highly accurate positive voltage variable output type shunt regulator IC. Since the output voltage is adjustable from approximately 1.25 V to 15 V, it is suitable for a power supply of small-sized 3 V-system portable equipment. Also, it contributes to the miniaturization of set equipment by the adoption of the small type surface mounting package. I Features
- Highly accurate reference voltage:
1.25 V (allowance: ±1%)
- Low voltage operation: 1.25 V to 14 V
- Small type surface mounting package I Applications
- Cellular phone, PHS, office automation equipment and other small-sized portable equipment SSMINI-5D Unit: mm I Block Diagram Constant current source Output Reference voltage Ref. IREF VREF VK VCC 0.01 µF A K 2 4 VK = VREF (1 + R1) + IREF × R1R2 Error amplifier Output transistor Part No. (2 letters)Indicates No.1 pin Marking AQ 1.60±0.10 1.00±0.10 1.20±0.10 1.60±0.10 0.20+0.10 −0.05 0 to 0.10 0.500.50 0.20 0.20 0.12+0.10 −0.05 0.60 max. Note) The package of this product will be changed to lead-free type (SSMINI-5DA). See the new package dimensions section later of this datasheet.
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I Absolute Maximum Ratings Parameter Symbol Rating Unit Cathode voltage V K 14.2 V Reference voltage V REF 7V Supply current I K 1.5 mA Reference current I REF 50 µA Cathode-anode reverse current −IKA −10 mA Cathode-reference reverse current −IKR −10 mA Cathode current I K 20 mA Power dissipation *2 PD 50 mW Operating ambient temperature *1 Topr −30 to +85 °C Storage temperature *1 Tstg −55 to +150 °C I Recommended Operating Range Parameter Symbol Range Unit Supply voltage V CC VREF to 14 V Pin No. Description 1V CC Power source current supply pin. 2 Anode The reference voltage pin for the constant voltage of this shunt regulator IC. The current from VCC, cathode and reference flow out from this pin. 3 K: Cathode The constant voltage output pin of this shunt regulator. The supplied current more than necessary to this pin is bypassed to anode pin by the output transistor. 4 N.C. Nothing is connected to this pin. If high voltage is applied, the characteristics of the IC may be affected. 5 Reference The reference voltage (1.25 V typical) pin. Although the impedance is high under the no- rmal using conditions, be careful that the impedance drops and current flows into the IC inside if a current or voltage is forced to apply from the outside. Note) 1. Do not apply external currents or voltages to any pins not specifically mentioned. For circuit currents, ' +' denotes current flowing into the IC and ' −' denotes current flowing out of the IC. 2. *1: Except for the power dissipation, operating ambient temperature and storage temperature, all ratings are for T a = 25°C. *2: The value at Ta = 85°C.
I Electrical Characteristics at VCC = 1.8 V, Ta = 25°C Parameter Symbol Conditions Min Typ Max Unit Reference voltage V REF IK = 10 mA 1.2375 1.25 1.2625 V Reference voltage ∆VREF 1.7 V ≤ VCC ≤ 14.0 V, − 0.73 −1.5 mV/V supply voltage fluctuation ∆VCC IK = 10 mA Reference voltage ∆VREF 0.2 mA ≤ IK ≤ 20 mA 0.04 0.3 mV/mA cathode current fluctuation ∆IK Reference input current I REF R1 = 10 kΩ, IK = 10 mA 4.0 10 µA Minimum cathode current I K min VK = VREF 0.2 mA Off time total current I OFF VK = 14.0 V, VREF = 0 V 1 µA Cathode saturation voltage V Ksat IK = 10 mA, VREF = 1.3 V 0.08 0.15 V Supply current ICC I K = 10 mA 0.75 1.50 mA Parameter Symbol Conditions Reference value Unit Reference voltage change ∆VREF /V KA = VREF , IKA = 10 mA 3 mV with temperature ∆Ta 0°C ≤ Ta ≤ +70°C Reference input current change ∆IREF /R 1 = 10 kΩ, IK = 10 mA 1.1 mA with temperature ∆Ta 0°C ≤ Ta ≤ +70°C
- Design reference data Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed. Power dissipation PD (W) 02 5 Ambient temperature Ta (°C) 50 75 100 125 00.000 0.050 0.100 0.120 0.150 0.200 Independent IC without heat sink Rth(j-a) = 833.3°C/W I Application Notes 1. P D Ta curves of SSMINI-5D package PD Ta
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I Application Notes (continued) 2. Main Characteristics Reference voltage (temperature characteristics) Reference current (temperature characteristics) Supply current Reference input current Reference voltage supply voltage fluctuation Reference voltage cathode current fluctuation VK = VREF VCC = 14 V VCC = 1.8 V VCC = 5 V 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 0 2 4 6 8 10 12 14 16 18 20 IK (mA) ICC (mA) 1.00 VCC = 1.8 V R1 = 10 kΩ 0 2 4 6 8 1 01 21 41 61 82 0 IK (mA) IREF (µA) VCC = 1.8 V VK = VREF −10.0 −6.0 −8.0 −4.0 −2.0 02 8 6 1 01 21 41 61 842 0 IK (mA) ∆VREF (mV) 6.0 4.0 2.0 50°C 95°C 75°C Ta = 0°C 25°C −25°C VCC = 1.8 V VK = VREF 024 8 1 01 21 41 61 86 20 IK (mA) IREF (µA) Ta = −25°C 0°C 95°C 75°C 25°C 50°C VK = VREF IK = 10 mA −14 −16 −12 −10 1.5 2 4 6 8 10 12 14 VCC (V) ∆VREF (mV) VCC = 1.8 V VK = VREF 0 2 4 6 8 1 01 21 41 61 82 0 IK (mA) ∆VREF (mV)
VREF temperature characteristic Cathode saturation voltage 1.24 −50 150 100500 Temp. (°C) VREF (V) 1.26 1.258 1.254 1.256 1.252 1.25 1.248 1.246 1.244 1.242 VCC = 1.8 V VREF = 1.3 V 0246 1 0 1 2 1 4 1 6 1 882 0 IK (mA) VKsat (mV) 200 180 160 140 120 100 VCC = 1.8 V −100 −90 −80 −70 −60 −50 −40 −30 −20 −10 IK (µA) ∆VREF (mV) I Application Notes (continued) 2. Main Characteristics (continued)
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(Primary side) Primary side to control IC (Secondary side) EO (+) EO (−) VCC VREF 0.01 µF AN1433SSM I Application Circuit Example This circuit amplifies the error voltage of the secondary side output voltage in the insulation type switching power supply, then transfers it to the primary side via a photocoupler. Replaceable with the conventional products (AN1431M, AN1431T, AN1432MS). Note) As V CC and cathode pin are separated, V K can operate till 0.15 V max (at IK = 10 mA) at least. I New Package Dimensions (Unit: mm)
- SSMINI-5DA (Lead-free package) 0 to 0.10 21 0.200.20 1.20±0.10 1.60±0.10 1.00±0.10 1.60±0.10 0.50 Seating plane 0.60 max. 0.08+0.10 -0.05 0.20+0.10 -0.05 0.50 0.10 M0.10
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