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TS4436AICT
Adjustable 0.6V open collector shunt voltage reference
March 2006 Revision 1 1/8
TS4436Adjustable 0.6V Open Collector Shunt Voltage Reference Internal 0.6V ±0.5% precision Low output saturation voltage
75mV max. between SINK and GND Low current consumption: 150µA Low supply voltage 1.7V Industrial temperature range: -40 to +85°C 150ppm/°C temperature coefficient Lead free available
DescriptionThe TS4436 is a four-terminal device dedicated to
low voltage Switch Mode Power Supplies
(SMPS).
It integrates a 0.6V voltage reference, an
amplifier, and an open collector output transistor
in a single package. The TS4436’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.
TS4436 features an open collector transistor with
an ultra-low saturation voltage. This feature allows
it to be used in series with the optocoupler in an
SMPS for regulation up to a 1.8V output voltage.
Applications Low voltage switch mode power supplies Isolated DC/DC converter Computers Low voltage discrete regulators
Order Codes
Absolute Maximum Ratings and Operating Conditions TS44362/8
Absolute Maximum Ratings and Operating
Conditions
Table 1. Key parameters and their absolute maximum ratings Pdiss 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 packagePdiss has been calculated with TAMB = 25°C, T Junction =150°C and
RthJA = 250°C/W for the SOT23-5 packagethJC = 81°C/W for the SOT23-5 package
Table 2. Operating conditions
Typical Application Schematic TS44363/8
Typical Application Schematic
Figure 1. SMPS power supply: secondary side
Electrical Characteristics TS44364/8
3 Electrical Characteristics Note: Limits are 100% production tested at 25°C. Limits over temperature are guaranteed through
correlation and by design.
Table 3. Electrical characteristics for Tamb = 25°C, VCC = 1.8V, ISINK = 2mA unless
otherwise specified
Electrical Characteristics TS44365/8
Figure 2. Vref vs. temperature Figure 3. Vref vs. temperature
Figure 4. ICC vs. temperature Figure 5. ICC at 25°C
Figure 6. VSAT vs. temperature Figure 7. Vref vs. temperature
Package Mechanical Data TS44366/8
Package Mechanical DataIn order to meet environmental requirements, ST offers these devices in ECOPACK®
packages. These packages have a Lead-free second level interconnect. The category of
second level interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an ST trademark.
ECOPACK specifications are available at: .
SC70 Package
