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TS4431AILT
1.224V open collector shunt voltage reference
Rev 2
November 2005 1/8
TS44311.224V Open Collector Shunt Voltage Reference Internal 1.224V ±0.5% precision Low output saturation voltage
75 mV max between SINK and GND Low current consumption: 250µA Industrial temperature range: -40 to +85°C 100ppm/°C temperature coefficient
DescriptionThe TS4431 is a four-terminal device dedicated to
low voltage Switch Mode Power Supplies (SMPS).
It integrates a 1.224V voltage reference, an
amplifier, and an open collector output transistor
in a single package. The TS4431’s operating
mode is similar to the well-known standard
voltage reference, the TL431. It maintains the
desired feedback voltage at the REF pin in a
closed loop configuration by sinking a current
proportional to the error voltage at the REF pin.
TS4431 features an open collector transistor with
an ultra-low saturation voltage, allowing it to be
used in series with the optocoupler in an SMPS
architecture to regulate low voltage SMPS.
Applications Low voltage switch mode power supplies Isolated DC/DC converter Computers Low voltage discrete regulator
Order Codes
Absolute Maximum Ratings TS44312/8
Absolute Maximum Ratings
Table 1. Key parameters and their absolute maximum ratings PD has been calculated with TAMB = 25°C, TJunction=150°C and
RthJA = 250°C/W for the SOT23-5 package
RthJC = 81°C/W for the SOT23-5 package
Table 2. Operating conditions
Typical Application Schematic TS44313/8
2 Typical Application Schematic
Figure 1. SMPS power supply: secondary side
Electrical Characteristics TS44314/8
3 Electrical Characteristics
Table 3. Electrical characteristics for T amb = 25°C, VCC = 1.8V, I SINK = 2mA unless
otherwise specified Note: Limits are 100% production tested at 25°C. Limits over temperature are guaranteed through
correlation and by design.
Electrical Characteristics TS44315/8
Figure 2. Vref vs. temp. Isink=2mA Figure 3. Vref vs. temp. Isink=2mA
Figure 4. dVref/dVcc vs. temp. Isink=2mA Figure 5. Icc vs. temp. Isink=2mA
Figure 6. Icc vs. temp. Isink=2mA Figure 7. Vref vs. temp. Vcc=1.8V
Electrical Characteristics TS44316/8
Figure 8. dVref/dIsink vs. temp. Vcc=1.8V Figure 9. Iref vs. temp. Vcc=1.8V
Figure 10. Vsat vs. temp. Vcc=1.8V
