SE1086

SE1086 SECOS | Alldatasheet

Document overview

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Technical content

Features

• 1.4V Max. Dropout Full Load Current * Output Current Limiting * Fast Transient Response * Built-in Thermal Shutdown 01-Jun-2002 Rev. A Page 1 of 4 http://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual R o H S C o m p l i a n t P r o d u c t Typical Circuit A 4.40 4.80 c1 1.25 1.45 b 0.76 1.00 b1 1.17 1.47 c 0.36 0.50 L 13.25 14.25 D 8.60 9.00 e 2.54 REF. E 9.80 10.4 L1 2.60 2.89 L4 14.7 15.3 Ø 3.71 3.96 L5 6.20 6.60 A1 2.60 2.80 Millimeter Millimeter Block Diagram

Operating Juction Temperature Range Parameter Symbol Ratings Unit VVIN -0.3 to 12 0~+150 -65~+150 Absolute Maximum Ratings PD TST TOP C o C o Internally Limited Pin Descriptions Elektronische Bauelemente http://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual 01-Jun-2002 Rev. A Page 2 of 4 Name I/O PIN# FUNCTION Adj (GND) 1 Adjustable (Ground only for fixed mode) Vout O 2 The output of the regulator. A minimum of 10uF capacitor must be connected from this pin to ground to insure stability. Vin I 3 The input pin of regulator .Typically a large storage capacitor is connected from this pin to ground to insure that the input voltage does not sag below the min. dropout voltage during the load tage does not sag below the minimum dropout voltage during the load transient response .This pin must always be 1.5V higher than Vout in order for the device to V higher than Vout in order for the device to regulate properly.

Electrical Characteristics

Parameter Conditions MIN TYP MAX UNIT Reference Voltage SE1086-Adj Io=10mA, TJ =25, (Vin-Vout )=1.5V 1.225 1.250 1.275 V SE1086-1.5 Io=10mA, TJ =25, 3VVin12V 1.470 1.500 1.530 V SE1086-2.5 Io=10mA, TJ =25, 4VVin12V 2.450 2.500 2.550 V Output Voltage Line Regulator SE1086-XXX Io=10mA, Vout+1.5<Vin<12 - - 0.2 % SE1086ADJ Vin=3.3V, 0mA<Io<1.5A, TJ=25(Note 1,2) - - 1 % SE1086-1.5 Vin=3.0V, 0mA<Io<1.5A, TJ=25(Note 1,2) - 12 15 mV SE1086-1.8 Vin=3.3V, 0mA<Io<1.5A, TJ =25(Note 1,2) - 15 18 mV SE1086-2.5 Vin=4.0V, 0mA<Io<1.5A, TJ=25(Note 1,2) - 20 25 mV SE1086-3.3 Vin=5.0V, 0mA<Io<1.5A, TJ=25(Note 1,2) - 26 33 mV Load Regulation SE1086-5.0 Vin=8.0V, 0mA<Io<1.5A, TJ=25(Note 1,2) - 40 50 mV Dropout Voltage (Vin-Vout) SE1086-XXX Io=1.5A( Vout=1% Vout) - 1.3 1.4 V Current Limit SE1086-XXX Vin-Vout=5V 1.6 - - A Minimum Load Current SE1086-XXX 0 TJ 125 - 5 10 mA Thermal Regulation TA=25, 30ms pulse - 0.008 0.04 %/W F=120Hz, COUT=25uF, Tantalum, Io=1.5A Ripple Rejection SE1086-XXX Vin=Vout+3V - 60 70 dB Temperature Stability Io=10mA - 0.5 - % Thermal Resistance Junction– to-Ambient (No heat sink ;No air flow) - 86 - /W Thermal Resistance Junction-to-Case Control Circuitry/Power Transistor - 0.65/2.7 - /W Note 1: See thermal regulation specifications for changes in output voltage due to heating effects. Line and load regulation are measured at a constant junction Temperature by low duty cycle pulse testing. Load regulation is measured at the output lead =1/18” from the package. Note 2: Line and load regulation are guaranteed up to the maximum power dissipation of 15W. Power dissipation is determined by the difference in input and output and the output current. Guaranteed maximum power dissipation will not be available over the full input/output range. Note 3: Quiescent current is defined as the minimum output current required in maintaining regulation. At 12V input/output differential the device is guaranteed to regulate if the output current is greater than 10mA. SE1086 1.5A Low Dropout Positive Adjustable or Fixed-Mode Regulator

01-Jun-2002 Rev. A Page 3 of 4 h tp://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual Elektronische Bauelemente Functional Description Introduction The SE1086 adjustable or fixed-mode Low Dropout (LDO) regulator is a 3 terminal device which can easily be programmed by internal mask change to any voltage within the range of 1.25 to Vin-1.4V. The SE1086 only needs 1.4V differential between Vin and Vout to maintain output regulation, in addition, the output voltage tolerances are also extremely tight and they include the transient response as port of the specification. For example, Intel VRE specification calls for a total of +/-100mV including initial tolerance, load regulation and 0 to 1.5A load step. The SE1086 is specifically designed to meet the fast current transient needs as well as providing an accurate initial voltage, reducing the overall system cost with the need for fewer output capacitors. Load Regulation Since the SE1086 is only a 3 terminal device, it is not possible to provide true remote sensing of the output voltage at the load. But it can supply good load regulation by internal feedback bypass the external loss such as adjustable mode. Stability The SE1086 requires the use of an output capacitor as part of the frequency compensation in order to make the regulator stable .For most applications a minimum of 10uF aluminum electrolytic capacitor insures both stability and good transient response. Thermal Design The SE1086 incorporates an internal shutdown that protects the device when the junction temperature exceeds the maximum allowable junction temperatures. Although this device can operate with junction temperatures in the range of 150:, it is recommended that the selected heat sink be chosen such that during maximum continuous load operation the junction temperature is kept below the temperature. Layout Consideration The output capacitors must be located as close to the Vout terminal of the device as possible .It is recommended to use a section of a layer of the PC board as a plane to connect the Vout pin to the output capacitors to prevent any high frequency oscillation that may result due to excessive trace inductance. SE1086 1.5A Low Dropout Positive Adjustable or Fixed-Mode Regulator

01-Jun-2002 Rev. A Page 4 of 4 h tp://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual Elektronische Bauelemente Performance Characteristics SE1086 1.5A Low Dropout Positive Adjustable or Fixed-Mode Regulator