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| Voltage Regulators 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. 1.600.10 0.20 1 1.200.10 0.20 5 Unit: mm 0.50 0.50 1.600.10 1.000.10 2 3 4 0.60 max. 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 0.12 -0.05 +0.10 I Applications * Cellular phone, PHS, office automation equipment and other small-sized portable equipment Marking SSMINI-5D AQ Indicates No.1 pin Part No. (2 letters) I Block Diagram 0.01 F VCC K 1 3 Output VK R1 IREF Ref. Constant current source 5 Error amplifier Reference voltage Output transistor R2 VREF 2 A VK = VREF (1 + R1) + IREF x R1 R2 Publication date: August 2001 SFF00002AEB 4 0 to 0.10 0.20+0.10 -0.05 1 AN1433SSM I Pin Descriptions Pin No. 1 2 3 4 5 VCC Anode K: Cathode N.C. Reference Description Power source current supply pin. 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. 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. Nothing is connected to this pin. If high voltage is applied, the characteristics of the IC may be affected. The reference voltage (1.25 V typical) pin. Although the impedance is high under the normal 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. I Absolute Maximum Ratings Parameter Cathode voltage Reference voltage Supply current Reference current Cathode-anode reverse current Cathode-reference reverse current Cathode current Power dissipation *2 *1 Symbol VK VREF IK IREF -IKA -IKR IK PD Topr Tstg Rating 14.2 7 1.5 50 -10 -10 20 50 -30 to +85 -55 to +150 Unit V V mA A mA mA mA mW C C Operating ambient temperature Storage temperature *1 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 Ta = 25C. *2: The value at Ta = 85C. I Recommended Operating Range Parameter Supply voltage Symbol VCC Range VREF to 14 Unit V 2 SFF00002AEB AN1433SSM I Electrical Characteristics at VCC = 1.8 V, Ta = 25C Parameter Reference voltage Reference voltage supply voltage fluctuation Reference voltage cathode current fluctuation Reference input current Minimum cathode current Off time total current Cathode saturation voltage Supply current * Design reference data Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed. Symbol VREF VREF VCC VREF IK IREF IK min IOFF VKsat ICC Conditions IK = 10 mA 1.7 V VCC 14.0 V, IK = 10 mA 0.2 mA IK 20 mA R1 = 10 k, IK = 10 mA VK = VREF VK = 14.0 V, VREF = 0 V IK = 10 mA, VREF = 1.3 V IK = 10 mA Min Typ Max Unit V mV/V mV/mA A mA A V mA 1.2375 1.25 1.2625 - 0.73 -1.5 0.04 4.0 0.08 0.75 0.3 10 0.2 1 0.15 1.50 Parameter Reference voltage change with temperature Reference input current change with temperature Symbol VREF / Ta IREF / Ta Conditions VKA = VREF , IKA = 10 mA 0C Ta +70C R1 = 10 k, IK = 10 mA 0C Ta +70C Reference value 3 1.1 Unit mV mA I Application Notes 1. PD Ta curves of SSMINI-5D package PD T a 0.200 Power dissipation PD (W) 0.150 Independent IC without heat sink Rth(j-a) = 833.3C/W 0.120 0.100 0.050 0.000 0 0 25 50 75 100 125 Ambient temperature Ta (C) SFF00002AEB 3 AN1433SSM I Application Notes (continued) 2. Main Characteristics Supply current 1.00 0.95 0.90 0.85 VCC = 14 V VCC = 5 V VCC = 1.8 V VK = VREF 10 9 8 7 Reference input current VCC = 1.8 V R1 = 10 k IREF (A) ICC (mA) 0.80 0.75 0.70 0.65 0.60 0.55 0.50 0 2 4 6 8 10 12 14 6 5 4 3 2 1 0 16 18 20 0 2 4 6 8 10 12 14 16 18 20 IK (mA) IK (mA) Reference voltage (temperature characteristics) 6.0 4.0 2.0 Ta = 0C 25C VCC = 1.8 V VK = VREF Reference current (temperature characteristics) 10 9 8 7 Ta = -25C VCC = 1.8 V VK = VREF VREF (mV) IREF (A) 0 -2.0 -4.0 -25C 6 5 4 0C 25C 50C -6.0 -8.0 -10.0 95C 75C 95C 75C 50C 3 2 1 0 0 2 4 6 8 10 12 14 16 18 20 0 2 4 6 8 10 12 14 16 18 20 IK (mA) IK (mA) Reference voltage supply voltage fluctuation 6 4 2 0 VK = VREF IK = 10 mA Reference voltage cathode current fluctuation 5 4 3 VCC = 1.8 V VK = VREF VREF (mV) -4 -6 -8 -10 -12 -14 -16 1.5 2 4 6 8 10 12 14 VREF (mV) -2 2 1 0 -1 -2 -3 -4 -5 0 2 4 6 8 10 12 14 16 18 20 VCC (V) IK (mA) 4 SFF00002AEB AN1433SSM I Application Notes (continued) 2. Main Characteristics (continued) VREF temperature characteristic 1.26 1.258 1.256 1.254 200 180 160 140 VCC = 1.8 V VREF = 1.3 V Cathode saturation voltage VKsat (mV) 0 50 100 150 VREF (V) 1.252 1.25 1.248 1.246 1.244 1.242 1.24 -50 120 100 80 60 40 20 0 0 2 4 6 8 10 12 14 16 18 20 Temp. (C) IK (mA) Minimum cathode current VCC = 1.8 V 0 -10 -20 VREF (mV) -30 -40 -50 -60 -70 -80 -90 -100 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5 IK (A) SFF00002AEB 5 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). (Primary side) (Secondary side) EO (+) AN1433SSM VCC 0.01 F EO (-) Primary side to control IC VREF Note) As VCC and cathode pin are separated, VK can operate till 0.15 Vmax (at IK = 10 mA) at least. 6 SFF00002AEB |
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