SC4212B Very Low Input /Very Low Dropout 1 Amp Regulator POWER MANAGEMENT Features Description Input Voltage Range from 1.6V to 6.0V 150mV Maximum Dropout @ 1A Adjustable Output from 0.5V with ± 1% Accuracy 12µA Quiescent Current in Shutdown Enable Input 250µs Internal Soft-Start Over Current and Over Temperature Protection Reverse Blocking from Output to Input Full Industrial Temperature Range 3mm x 3mm x 1mm MLPD-8 Package Fully WEEE and RoHS Compliant Applications Telecom and Networking Cards Motherboards and Peripheral Cards Industrial Applications Wireless Infrastructure Medical Equipment The SC4212B is a high performance linear voltage regulator designed for applications requiring very low dropout voltage at load currents up to 1 Ampere. It operates with VIN as low as 1.6V and up to 6V, making it useful for a wide range of different applications and rails. The output voltage is programmable down to 0.5V, set via an external resistor divider, or to a fixed setting of 0.5V depending upon how the FB pin is configured. The SC4212B has an enable pin to further reduce power dissipation while shut down. Protection features include over current protection, over temperature protection and reverse blocking from output to input. The SC4212B is available in a 3mm x 3mm MLPD-8 package. Typical Application Circuit SC4212B V IN V IN EN EN S C 4 2 1 2B V O = 0 .5 V VO VO FB V IN V IN EN EN GND VO = 0 .5 (R 1 + R 2 ) R2 VO VO FB R1 C3 GND C2 C1 C2 C1 R2 R2 * C3 is a placeholder Rev. 2.0 © 2015 Semtech Corporation SC4212B Pin Configuration Ordering Information TOP VIEW NC 1 8 GND EN 2 7 FB VIN 3 6 VO NC 4 5 NC Device Package SC4212BMLTRC(1)(2) 3mm x 3mm x 1mm MLPD-8 SC4212BEVB Evaluation Board Notes: (1) Available in tape and reel only. A reel contains 3,000 devices. (2) Available in lead-free package only. Device is WEEE and RoHS compliant and halogen free. 3mm x 3mm x 1mm MLPD-8 θJA = 36.3°C/W Marking Information 212B yyww xxxx yyww = Datecode ( Example : 1352 ) xxxx = Semtech Lot No. ( Example : 2932 ) SC4212B Absolute Maximum Ratings Recommended Operating Conditions VIN, VO to GND (V). . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to 6.5 VIN (V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6 ≤ VIN ≤ 6.0 EN to GND (V). . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to VIN + 0.3 Junction Temperature Range (°C). . . . . . . . . . -40 ≤ TJ ≤ +125 FB to GND (V). . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to VIN + 0.3 Output Current Range. . . . . . . . . . . . . . . . . . . . 50 µA ≤ IO ≤ 1A Power Dissipation. . . . . . . . . . . . . . . . . . . . . . Internally Limited Thermal Information ESD Protection Level HBM(1) (kV). . . . . . . . . . . . . . . . . . . 4 ESD Protection Level CDM(2) (kV). . . . . . . . . . . . . . . . . . . 1 Thermal Resistance, Junction to Ambient (3) (°C/W). . 36.3 Thermal Resistance, Junction to Case (°C/W). . . . . . . . 3.77 Storage Temperature (°C). . . . . . . . . . . . . . . . . . . . -65 to +150 Peak IR Reflow Temperature (10s to 30s). . . . . . . . . . +260 Exceeding the above specifications may result in permanent damage to the device or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not recommended. NOTES: (1) Tested according to standard ANSI/ESDA/JEDEC JS-001-2012. (2) Tested according to standard JESD-C101E. (3) Calculated from package in still air, mounted to 3” x 4.5”, 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards. Electrical Characteristics Unless noted otherwise TJ = 25° C for typical, -40° C < TJ < 125° C for min and max. VEN = VIN, VFB = VO, VIN = 1.6V to 6.0V, CIN=10µF, COUT=10µF. Parameter Symbol Conditions Min Typ Max Units 6.0 V 680 µA 2 mA 12 50 µA 0.500 0.505 V VIN VIN operating range(1) 1.6 VIN = 3.3V, IO = 0A Quiescent current IQ 325 IO = 1A VEN =0V Feedback Feedback voltage(2) VFB IO = 10mA to 1A 0.495 Feedback pin current IFB VFB = VOUT 80 200 nA Line regulation(2) IO = 10mA 0.01 0.2 %/V Load regulation(2) IO = 10mA to 1A 0.21 1.0 % VO SC4212B Electrical Characteristics (continued) Parameter Symbol Conditions IO =0.5A Dropout voltage(3) VDO IO = 1A Current limit Min Typ Max 1.6V ≤ VIN < 2.2V 86 2.2V ≤ VIN ≤ 6.0V 75 1.6V ≤ VIN < 2.2V 175 2.2V ≤ VIN ≤ 6.0V 150 ICL Units mV 1.2 2.6 A EN Enable pin current Enable pin threshold IEN VEN = 0V, VIN = 1.6V to 6.0V 1.5 10 µA VEN = VIN 80 200 nA VIH VIL 1.2 VIN = 1.6V to 6.0V V 0.4 Over Temperature Protection High trip level Hysteresis THI 150 O C THYST 10 O C Notes: (1) Minimum VIN = VOUT + VDO or 1.6V, whichever is greater. (2) Low duty cycle pulse testing with Kelvin connections required. (3) VDO = VIN - VO when VFB = GND. SC4212B Pin Descriptions Pin # Pin Name 1, 4, 5 NC No connection. Do not connect to any node electrically. 2 EN Enable input. Driving this pin high turns on the regulator. Driving this pin low shuts off the regulator. If not driven from a control circuit, tie this pin directly to the VIN pin, or via a resistor up to 400kΩ. 3 VIN Input supply pin. A large bulk capacitance should be placed close to this pin to ensure that the input supply does not sag below the minimum VIN. 6 VO Regulator output pin. Refer to the Applications Information section for output capacitor selection. 7 FB Input of the error amplifier. This pin is used to set the output voltage (See typical Application Circuits on page 1). 8 GND THERMAL PAD Pin Function Ground pin. The exposed pad enhances thermal performance and is not electrically connected inside the package. It is recommended to connect the exposed pad to the ground plane using multiple vias. Block Diagram R e ve rse P o la rity P ro te ctio n C ircu itry V IN VO O ve r-cu rre n t a n d th e rm a l sh u td o w n C ircu itry FB EN E n a b le C ircu itry V REF C ircu itry GND SC4212B Typical Characteristics Unless noted otherwise CIN=10µF/10V X7R 0805, COUT=10µF/10V X7R 0805. Dropout Voltage at Vin = 1.6V 1A 0.5A Dropout Voltage at Vin = 6.0V Dropout Voltage at Vin = 2.2V 1A 0.5A Current Limit Threshold 1A 0.5A Input Under-voltage Lockout Threshold Shutdown Current Vin rising threshold Vin = 6.0V Vin = 3.3V Vin falling threshold Vin = 1.6V SC4212B Typical Characteristics (Continued) Unless noted otherwise CIN=10µF/10V X7R 0805, COUT=10µF/10V X7R 0805. Quiescent Current Output Rise Time ENABLE Rising Threshold ENABLE Falling Threshold Io = 0A Power Supply Ripple Rejection Vin = 1.8V, Vo = 0.5V Output Spectral Noise Density RL = 50Ω SC4212B Applications Information Introduction Over-Current and Thermal Shutdown The SC4212B is intended for applications where high current capability and very low dropout voltage are required. It provides a very simple, low cost solution that uses very little PCB area. Additional features include an enable pin to allow for a very low power consumption in standby mode, and a fully adjustable output. The over-current protection and thermal shutdown functions protect the regulator against damage due to excessive power dissipation. The SC4212B is designed to current limit when the output current reaches 1.6A (typical). When the load exceeds 1.6A, the output voltage is reduced to maintain a constant current limit. VO Setting: VO = VREF The thermal shutdown function limits the junction temperature to a maximum of 150OC (typical). Thermal shutdown turns off the regulator as the junction temperature reaches the high trip level of 150OC. When the junction temperature drops below 140OC (typical), the regulator is turned on once again. By connecting the FB pin directly to the VO pin, the output voltage will be regulated to the 0.5V internal reference. In this configuration, R2 should be 10kΩ. VO Setting with External Resistors The use of 1% resistors, and designing for a current flow ≥ 50µA is recommended to ensure a well regulated output (thus R2 ≤ 10kΩ). R1 can then be calculated from R1 = R2 (VO-VREF)/VREF Enable Pulling this pin below 0.4V turns the regulator off, reducing the quiescent current to a fraction of its operating value. Driving this pin high enables the regulator. A pull up resistor ≤ 400kΩ should be connected from this pin to the VIN pin in applications where the Enable pin is not driven from a control circuit. Thermal Considerations The power dissipation in the SC4212B is given by the following equation: PD ≈ IO(VIN - VO) The allowable power dissipation will be dependant upon the thermal impedance achieved in the application. The derating curve below is valid for the thermal impedance specified in the Thermal Information section on page 3. Input Capacitor A 10µF X5R or X7R ceramic capacitor, along with a 0.1µF ceramic decoupling capacitor is recommended to be placed directly next to the VIN pin. This allows for the device being some distance from the input source, reducing the input droop due to load transients and improving load transient response. Additional capacitance may be needed if large step, fast di/dt load transients are required or the LDO is located far away from the input source. Figure 1. Power Derating Curve Output Capacitor A 10µF or larger X5R or X7R ceramic capacitor, along with a 0.1µF ceramic decoupling capacitor is recommended. SC4212B Outline Drawing — 3mm x 3mm MLPD-8 SC4212B Land Pattern — 3mm x 3mm MLPD-8 K Y (C ) H X D IM G Z C G H K P X Y Z D IM E N S IO N S IN C H E S M ILLIM E T E R S (.1 1 6) .0 87 .0 67 .1 02 .0 26 .0 16 .0 30 .1 46 (2 .9 5) 2 .20 1 .70 2 .58 0 .65 0 .40 0 .75 3 .70 P NOTES: 1. C O N T R O L L IN G D IM E N S IO N S A R E IN M IL L IM E T E R S (A N G L E S IN D E G R E E S ). 2. T H IS L A N D P A T T E R N IS F O R R E F E R E N C E P U R P O S E S O N L Y . C O N S U L T Y O U R M A N U F A C T U R IN G G R O U P T O E N S U R E Y O U R C O M P A N Y 'S M A N U F A C T U R IN G G U ID E L IN E S A R E M E T . 3. T H E R M A L V IA S IN T H E L A N D P A T T E R N O F T H E E X P O S E D P A D SH ALL BE C O N N EC TED TO A SYSTEM G RO UND PLANE. F A IL U R E T O D O S O M A Y C O M P R O M IS E T H E T H E R M A L A N D /O R F U N C T IO N A L P E R F O R M A N C E O F T H E D E V IC E . 10 SC4212B © Semtech 2015 All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent or other industrial or intellectual property rights. Semtech assumes no responsibility or liability whatsoever for any failure or unexpected operation resulting from misuse, neglect improper installation, repair or improper handling or unusual physical or electrical stress including, but not limited to, exposure to parameters beyond the specified maximum ratings or operation outside the specified range. SEMTECH PRODUCTS ARE NOT DESIGNED, INTENDED, AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN LIFESUPPORT APPLICATIONS, DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF SEMTECH PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE UNDERTAKEN SOLELY AT THE CUSTOMER’S OWN RISK. Should a customer purchase or use Semtech products for any such unauthorized application, the customer shall indemnify and hold Semtech and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs damages and attorney fees which could arise. 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