TLE4307 ,Voltage Regulatorapplications.Data Sheet Rev. 1.1 1 2000-10-11TLE 4307P-TO252-5-1 (D-PAK)GND ..
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TLE4470 ,Voltage RegulatorFunctional DescriptionThe TLE 4470 is a monolithic integrated voltage regulator with two very low-d ..
TLE4470 ,Voltage RegulatorFeatures Stand-by output 180 mA; 5 V
TLE4307
Voltage Regulator
Power-Charge-Pump and Low-Drop Voltage Regulator TLE4307
Power Charge Pump Circuit FeaturesHigh Current CapabilityShort Circuit ProtectionOvertemperature ProtectionActive Zener Circuit
Very Low Drop Voltage Regulator Features3.3V or 3.8V output voltageLow Output Voltage ToleranceHigh Current Capability 800mAShort Circuit ProtectionOvertemperature Protection
General FeaturesOptimized SMD Package
• New Type
Functional DescriptionThe TLE4307 is a monolithic integrated power charge pump with a Low Drop Voltage
Regulator. The power charge pump loads an energy storage capacitor at pin C. The
voltage regulator supplies 3.3 V or 3.8 V out of this storage capacitor with up to 800mA
output current. The TLE4307 is intended for use with DC supplies for consumer or
industrial applications.
Figure1Pin Configuration (top view)
Pin Definitions and Functions
Figure2Block Diagram
Circuit DescriptionThe TLE4307 consists of 2 stages, the charge pump and the very low drop voltage
regulator.
Charge PumpThe power stage is used as a switching element, that is driven by a buffer. A current
source keeps the power stage on. When the output C of the charge pump reaches VC,off,
the power stage is switched off. It is active clamped, when the input I reaches VI,cl.
Optional, an external capacity can be connected between pin SL and I to limit the slew
rate at the input, when an inductive load drives the IC. Saturation control as a function of
the load current prevents any over-saturation of the power element. The regulator is
additionally protected against overload and overtemperature.
Very Low Drop RegulatorThe control amplifier compares a reference voltage, made highly accurate by resistance
balancing, with a voltage proportional to the output voltage and drives the base of the
series PNP transistor via a buffer. Saturation control as a function of the load current
prevents any over-saturation of the power element. The regulator is additionally
protected against overload and overtemperature.
Figure3Application Example
Application DescriptionThe IC is meant to be used with a DC power supply. The power charge pump limits the
energy that is needed to drive the load at the output Q of the IC. The energy is stored to
a capacity CC, connected to pin C. When pin C reaches VC,off, the power charge pump is
switched off. Since the power supply consists of the inductance and a parasitic series
resistance, the remaining available energy is dissipated in the external power supply and
therefore does not stress the IC with this dispensable energy. The very low drop
regulator is provided with the energy, stored in CC. The regulator requires an output
capacitor CQ for the stability of the regulating circuit. Stability is guaranteed at values
above 22mF and an ESR £1W within the operating temperature range.
Absolute Maximum Ratings
Input
Charge-Pump Output
Slewrate Input
Regulator Output
Temperature
Thermal Data
ESD
Operating Range
Absolute Maximum Ratings (cont’d)
