SC4215ASTRT

POWER MANAGEMENT Description The SC4215A is a high performance positive voltage regulator designed for use in applications requiring very low input voltage and very low dropout voltage at up to 2 amp. It operates with a Vin as low as 1.4V, with output voltage programmable as low as 0.5V. The SC4215A features ultra low dropout, ideal for applications where Vout is very close to Vin. Additionally, the SC4215A has an enable pin to further reduce power dissipation while shutdown. The SC4215A provides excellent regulation over variations in line, load and temperature. The SC4215A is available in the SOIC-8EDP (Exposed Die Pad) package. The output voltage can be set via an external divider or to 0.5V depending on how the FB pin is configured. Very Low Input /Very Low Dropout 2 Amp Regulator With Enable Features Input Voltage as low as 1.4V 500mV dropout @ 2A Adjustable output from 0.5V to 3.3V Over current and over temperature protection Enable pin 10µA quiescent current in shutdown Low reverse leakage (output to input) Full industrial temperature range Available in SOIC-8EDP package SC4215A Applications Telecom/Networking cards Motherboards/Peripheral cards Industrial applications Wireless infrastructure Set top boxes Medical equipment Notebook computers Battery powered systems Typical Application Circuits U1 4 NC VIN EN NC NC VO FB GND 5 6 7 8 VIN ENABLE 3 2 1 VO R1 VO C2 = 0.5 (R1 + R2) R2 Volts SC4215A C1 R2 U1 4 NC VIN EN NC NC VO FB GND 5 6 7 8 4 NC VIN EN NC U1 NC VO FB GND 5 6 7 8 VIN ENABLE 3 2 1 VO VIN ENABLE 3 2 1 VO VO = 0.5V VO = 1V SC4215A C1 C2 C1 SC4215A C2 Revision April 29, 2005 1 www.semtech.com SC4215A POWER MANAGEMENT Absolute Maximum Ratings Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied. Parameter Vin, EN, Vo, FB Absolute Voltage Power Dissipation Thermal Resistance Junction to Ambient SOIC-8EDP(1) Thermal Resistance Junction to Case SOIC-8EDP(1) Operating Ambient Temperature Range Operating Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering) 10 Sec. ESD Rating (Human Body Model) Symbol Max 6 Units V W °C/W °C/W °C °C °C °C kV PD θJA θJC TA TJ TSTG TLEAD V ESD Internally Limited 36 5.5 -40 to +85 -40 to +150 -65 to +150 300 2 Note: (1) 2 square inch of FR-4, double sided, 1 oz. minimum copper weight. Electrical Characteristics Unless specified: VEN = VIN, VFB = VO, VIN = 1.40V to 5.5V, VIN = (VO + 0.5V) to 5.5V and IO = 1mA to 1A. Values in bold apply over the full operating temperature range. Parameter VIN Supply Voltage Range Quiescent Current Symbol Test Conditions Min Typ Max Units VIN IQ VIN = 3.3V, IOUT = 0A VIN = 5.5V, VEN = 0V 1.40 5.5 3 10 50 V mA µA VO Output Voltage(1) (Internal Fixed Voltage) Line Regulation(1) REG(LINE) VIN = (VO + 0.5V), VIN < 3.3V, IOUT = 10mA VIN = (VO + 0.5V), VIN > 3.3V, IOUT = 10mA Load Regulation(1) REG(LOAD) VIN = (VO + 0.5V), IOUT = 10mA to 1A VO VIN = VO + 0.5V, IOUT = 10mA -1.5% -3% 0.7 0.5 0.5 VO +1.5% +3% 1 1.5 1.5 % % % V Notes: (1) Low duty cycle pulse testing with Kelvin connections required. (2) Defined as the input to output differential at which the output voltage drops to 1.5% below the value measured at a differential of 0.5V. (3) Required to maintain regulation. Voltage set resistors R1 and R2 are usually utilized to meet this requirement. (4) Guaranteed by design. (5) When VFB exceeds this threshold, the “Sense Select” switch disconnects the internal feedback chain from the error amplifier and connects VFB instead.  2005 Semtech Corp. 2 www.semtech.com SC4215A POWER MANAGEMENT Electrical Characteristics (Cont.) Unless specified: VEN = VIN, VFB = VO, VIN = 1.40V to 5.5V, VIN = (VO + 0.5V) to 5.5V and IO = 1mA to 1A. Values in bold apply over the full operating temperature range. Parameter VO (Cont.) Dropout Voltage(1)(2) Symbol Test Conditions Min Typ Max Units VD IO = 1A 90 300 400 mV IO = 1.5A 200 400 500 mV IO = 2A, VIN = VO + 0.5V IO = 2A, VIN = VO + 0.6V Minimum Load Current(3) Current Limit(4) F eed b ack Reference Voltage(1) VREF VIN = 3.3V, VFB = VOUT, IO = 10mA 0.495 0.485 Feedback Pin Current(4) Feedback Pin Threshold(5) EN Enable Pin Current Enable Pin Threshold IEN VIH VIL Over Temperature Protection High Trip level Hysteresis THI THYST VEN = 0V, VIN = 3.3V VIN = 3.3V VIN = 3.3V 1.6 IADJ VTH(FB) VFB = VREF 0.05 IO ICL VIN = VO + 0.5V 2.1 300 500 600 1 mV mA A 3 0.5 0.505 0.515 V 2 0.10 200 0.40 nA V 1.5 10 µA V 0.4 155 2 °C °C Notes: (1) Low duty cycle pulse testing with Kelvin connections required. (2) Defined as the input to output differential at which the output voltage drops to 1.5% below the value measured at a differential of 0.5V. (3) Required to maintain regulation. Voltage set resistors R1 and R2 are usually utilized to meet this requirement. (4) Guaranteed by design. (5) When VFB exceeds this threshold, the “Sense Select” switch disconnects the internal feedback chain from the error amplifier and connects VFB instead.  2005 Semtech Corp. 3 www.semtech.com SC4215A POWER MANAGEMENT Ordering Information Part Number SC4215ASTRT(1)(2)(3) S C 4215A E V B P ackag e SOIC-8EDP Temp. Range (TA) -40 to +85 OC Evaluation Board Note: (1) Available voltage is : 0.5V(FB=VO), 1.0V(FB=GND) or Output voltage can be adjusted using external resistors, see Pin Descriptions. (2) Only available in tape and reel packaging 2500 devices for the SOIC-8EDP package. (3) Lead free product. This product is fully WEEE and RoHS compliant. Pin Configuration Top View Bottom View GND NC EN VIN NC SOIC-8EDP GND FB VO NC GND FB VO NC 8 7 6 5 Exposed Die Pad 1 2 3 4 NC EN VIN NC SOIC-8EDP Pin Descriptions Pin Name Pin Description FB When this pin is grounded, an internal resistor divider sets the output voltage to 1.0V. If connected to the Vo pin, the output voltage will be set at 0.5V. If external feedback resistors are used, the output voltage will be (See Application Circuits on page 1): VO = 0.5 (R1 + R2) R2 Volts EN Enable Input. Pulling this pin below 0.4V turns the regulator off, reducing the quiescent current to a fraction of its operating value. A pull up resistor up to 400kOhms should be connected from this pin to the VIN pin in application where supply voltages of 1.4V