LR432ALT1G

LESHAN RADIO COMPANY, LTD.  352*5$00$%/(35(&,6,21 5()(5(1&(  LR432ALT1G Description The LR432ALT1G is a three-terminal adjustable regulator with a guaranteed thermal stability over applicable temperature ranges.The output voltage may be set to any value between VREF (approximately 1.24V) and 18V with two external resistors. It provides very wide applications,including shunt regulator,series regulator,switching regulator,voltage reference and others. SOT-23 SOT-23 1: Ref; 2: Cathode; 3: Anode Features: • Precise Reference Voltage to 1.24V • Guaranteed 1% Reference Voltage Tolerance • Sink Current Capability, 80µA to100mA • Quick Turn-on • Adjustable Output Voltage, Vo=VREF to 18V • 0.2 Ω Typical Output Impedance • Marking:EA We declare that the material of product is ROHS compliant and does not contain any B r, Cl, and Sb203 Ordering Information Device Marking Shipping LR432ALT1G EA 3000/Tape & Reel LR432ALT3G EA 10000/Tape & Reel Ver 1.6 1/7 LESHAN RADIO COMPANY, LTD. Absolute Maximum Ratings Symbol VKA IK I REF Tj Topr Parameter Cathode voltage Continuous cathode current range Reference current range Operating Junction Temperature Range Operating Ambient Temperature Electrical Characteristics Symbol TA= 25°C Reference voltage VDEV VREF Temp Deviation ∆VREF/∆VKA Ratio of Change in VREF to Change in Cathode Voltage IREF Reference Input Current IREF(DEV) IREF Temp Deviation Ik(off) Off-state cathode current IK(MIN) Unit V mA mA °C °C ( unless otherwise noted) Parameter VREF Zka Rating 18 100 3 150 - 40 to 105 Dynamic Output Impedance Minimum Operating Current Test Conditions VKA=VREF, lK=10mA (Fig. 1) TA =25°C TA=full range(see Note1) VKA=VREF, lK=10mA(Fig. 1) IK=10mA, VKA=18V to VREF (Fig. 2) IK=10mA, R1 =10kΩ R2=∞ (Fig.2) TK=full range (see Note 1), R1 =10kΩ, R2=∞, IK=10mA (Fig. 2) VREF=0 V,(Fig.3) Vk=18V Vka=Vref, Ik=1mA to 100mA F ≤1kHz (Fig. 1) VKA=VREF(Fig. 1) LR432ALT1G Min 1.228 Typ 1.240 Unit Max 1.252 V 10 25 mV -1 -2.7 mV / V 0.25 0.5 µA 0.05 0.3 µA 0.04 0.5 µA 0.2 0.4 Ω 60 80 µA  2/7 LESHAN RADIO COMPANY, LTD. Fig.1 Test Circuit for Vka=Vref, Vo=Vka=Vref, Co=0.1µF Fig.2 Test Circuit for Vka>Vref, Vo=Vka=Vref·(1+R1/R2)+Iref·R1, Co=0.1µF Fig.3 Test Circuit for Ik(off)  3/7 LESHAN RADIO COMPANY, LTD. Typical Performance Characteristics IKA=10mA TA=25oC 50 Output IKA 15KΩ 40 + 9µF 30 232Ω + - AV-Small Signal Voltage Amplification (dB) 60 - 8.25KΩ GND 20 Test Circuit for Voltage Amplification 10 0 10K 1K 100K f-Frequency-Hz 1M 10M Fig.4 Small-Signal Voltage Amplification vs Frequency ∣ZKA∣ Reference Impedance (Ω) 100 I KA=10mA o TA =25 C 1KΩ Output I KA 10 50Ω + GND 1 Test Circuit for Reference Impedance 0.1 1K 10K 100K 1M 10M f-Frequency-Hz Fig.5 Reference Impedance vs Frequency 150Ω I KA CL + - VBATT Test Circuit for Curve A I KA 150Ω R1=10KΩ CL R2 + - VBATT Fig.6 STABILITY BOUNDARY CONDITIONS Test Circuit for Curve B, C, and D Unstable  region  VKA(V)  R1(KΩ)  R2(KΩ)  A  B  Vref  5.0  0  30  ∞  10  4/7 LESHAN RADIO COMPANY, LTD. 1.253 0.40 VKA=VREF IKA=10mA R1=10KΩ R2=Infinite IKA=10mA 0.35 Reference Current (μA) Reference Voltage (V) 1.252 1.251 1.250 1.249 1.248 0.30 0.25 0.20 0.15 1.247 -50 -25 0 25 50 75 100 125 0.10 -50 150 -25 o Ambient Temperature ( C) 25 50 75 100 o Ambient Temperature ( C) Fig 7. Reference Voltage vs. Ambient Temperature Fig 8. Reference Current vs. Ambient Temperature 400 150 VKA=VREF 100 VKA=VREF 300 o TA=25 C o TA=25 C Cathode Current (μA) Cathode Current (mA) 0 50 0 -50 200 100 0 -100 -200 -100 -300 -150 -1 0 1 -1.0 -0.5 0.0 0.5 1.0 1.5 Cathode Voltage (V) Cathode Voltage (V) Figu 10. Cathode Current vs. Cathode Voltage Fig 9. Cathode Current vs. Cathode Voltage Input and Output Voltage (V) 3 Input Output R1 1.8KΩ 2 Pulse Generator f=100KHz 1 R2 50Ω Output GND 0 -1 0 1 2 3 4 5 6 Time (μS) Fig 11. Pulse Response of Input and Output Voltage 5/7 LESHAN RADIO COMPANY, LTD. Application Examples VIN V IN R CL R R1B R1A ON R2A R2B I OUT V IN + OFF LED on when Low Limit < V < High Limit IN (1+R1B/R2B) Low Limit ≈ V REF (1+R1A/R2A) High Limit ≈ V Delay = RC x ln ( VIN V -V IN ) I OUT = V REF / RCL REF REF Fig. 13 Delay Timer Fig. 12 Voltage Monitor V IN I OUT V IN Fig. 14 Current Limiter or Current Source V OUT VIN R1 R1 R2 R2 RS LIMIT V OUT = (1 + R1/R2) x VREF I OUT = V REF / RS Fig. 15 Constant-Current Sink V OUT PUSE Fig. 16 Higher-Current Shunt Regulator (1 + R1/R2) x VREF Fig. 17 Crow Bar VIN R1A R1B + R2A Low Limit High Limit R2B Output ON when Low Limit