LM39100-2.5

1A Low-Voltage Low-Dropout Regulator LM39100/39101/39102 SOT-223 FEATURES •Fixed and adjustable output voltages to 1.24V •410mV typical dropout at 1A Ideal for 3.0V to 2.5V conversion Ideal for 2.5V to 1.8V or 1.5V conversion •1A minimum guaranteed output current •1% initial accuracy LM39100-X.X Fixed •Low ground current •Current limiting and thermal shutdown SOP-8 •Reversed-battery protection •Reversed-leakage protection •Fast transient response •Low-profile SOT-223 package APPLICATIONS •LDO linear regulator for PC add-in cards •PowerPC™ power supplies •High-efficiency linear power supplies •SMPS post regulator •Multimedia and PC processor supplies •Battery chargers •Low-voltage microcontrollers and digital logic PIN DESCRIPTION CMOS-compatible control input. Enable (Input) IN OUT FLG ADJ GND Logic high = enable, logic Logic low or open = shutdown Supply (Input) Regulator Output Flag (Output): Open-collector error flag output. Adjustment Input: Feedback input. Connect to resitive voltage-divider network Connect to resitive voltage-divider network Ground ORDERING INFORMATION Device LM39100- X.X LM39101-X.X LM39102-Adj Marking LM39100-X.X LM39101-X.X LM39102-Adj Package SOT-223 SOP-8 SOP-8 DESCRIPTION * X.X = Fixed Vout = 1.5V, 1.8V, 2.5V, 3.3V, 5.0V The LM39100, LM39101, and LM39102 are 1A low-dropout linear voltage regulators that provide lowvoltage,high-current output from an extremely small package. The LM39100/1/2 offers extremely low dropout (typically 410mVat 1A) and low ground current (typically 12mA at 1A). The LM39100 is a fixed output regulator offered in theSOT-223 package. The LM39101 and LM39102 are fixedand adjustable regulators, respectively, in a thermally en-hanced power 8-lead SOP (small outline package). The LM39100/1/2 is ideal for PC add-in cards that need toconvert from standard 5V to 3.3V, 3.3V to 2.5V or 2.5V to1.8V. A guaranteed maximum dropout voltage of 630mV overall operating conditions allows the LM39100/1/2 to provide2.5V from a supply as low as 3.13V and 1.8V from a supplyas low as 2.43V. The LM39100/1/2 is fully protected with over current limiting,thermal shutdown, and reversed-battery protection. Fixed voltages of 5.0V, 3.3V, 2.5V,1.8V and 1.5V are available on LM39100/1 with adjustable output voltages to 1.24V on LM39102. HTC 1 1A Low-Voltage Low-Dropout Regulator LM39100/39101/39102 Typical Application Circuit Absolute Maximum Ratings (Note 1) Supply Voltage (VIN) Enable Voltage (VEN) Storage Temperature (TS) Lead Temperature (soldering, 5 sec) ESD, Note 3 Operating Ratings (Note 2) Supply Voltage (VIN) Enable Voltage (VEN) Maximum Power Dissipation (PD(max)) Junction Temperature (TJ) Package Thermal Resistance SOT-223 (θJC) SOP-8 (θJC) +2.25V to +16V +16V Note 4 –20V to +20V +20V –65°C to +150°C 260°C –40°C to +125°C 15°C/W 20°C/W HTC 2 1A Low-Voltage Low-Dropout Regulator Block Diagram LM39100/39101/39102 LM39100 Fixed (1.5V,1.8V,2.5V,3.3V,5.0V) LM39100 Fixed with Flag and Enable LM39102 Adjustable HTC 3 1A Low-Voltage Low-Dropout Regulator LM39100/39101/39102 HTC 4 1A Low-Voltage Low-Dropout Regulator LM39100/39101/39102 TYPICAL PERFORMANCE CHARACTERISTICS HTC 5 1A Low-Voltage Low-Dropout Regulator LM39100/39101/39102 HTC 6 1A Low-Voltage Low-Dropout Regulator APPLICATION INFORMATION LM39100/39101/39102 The LM39100/1/2 is a high-performance low-dropout voltage regulator suitable for moderate to high-current voltage regulator applications. Its 630mV dropout voltage at full loadand over temperature makes it especially valuable in battery-powered systems and as high-efficiency noise filters in post-regulator applications. Unlike older NPN-pass transistor de-signs, where the minimum dropout voltage is limited by thebase-to-emitter voltage drop and collector-to-emitter satura-tion voltage, dropout performance of the PNP output of these devices is limited only by the low V CE saturation voltage.A trade-off for the low dropout voltage is a varying base drive requirement. The LM39100/1/2 regulator is fully protected from damage due to fault conditions. Linear current limiting is provided.Output current during overload conditions is constant. Thermal shutdown disables the device when the die temperature exceeds the maximum safe operating temperature. Tran-sient protection allows device (and load) survival even when the input voltage spikes above and below nominal. The output structure of these regulators allows voltages in excess of the desired output voltage to be applied without reverse current flow. Output Capacitor The LM39100/1/2 requires an output capacitor to maintain stability and improve transient response. Proper capacitor selection is important to ensure proper operation. The LM39100/1/2 output capacitor selection is dependent upon the ESR (equivalent series resistance) of the output capacitor to maintain stability. When the output capacitor is 10µF orgreater, the output capacitor should have an ESR less than 2Ω. This will improve transient response as well as promote stability. Ultra-low-ESR capacitors (