SEMTECH SC4215H

SC4215H Very Low Input /Very Low Dropout 2 Amp Regulator With Enable POWER MANAGEMENT Features Description  Input Voltage as low as 1.4V The SC4215H is a high performance positive voltage regu-  400mV dropout @ 2A lator designed for use in applications requiring very low  Adjustable output from 0.5V input voltage and very low dropout voltage at up to 2  Over current and over temperature protection amperes. It operates with a Vin as low as 1.4V, with output  Enable pin voltage programmable as low as 0.5V. The SC4215H fea-  10µA quiescent current in shutdown tures ultra low dropout, ideal for applications where Vout  Full industrial temperature range is very close to Vin. Additionally, the SC4215H has an  Available in SOIC-8-EDP Lead-free package, fully WEEE enable pin to further reduce power dissipation while shut- and RoHS compliant and halogen free down. The SC4215H provides excellent regulation over variations in line, load and temperature. Applications The SC4215H is available in the SOIC-8-EDP (Exposed Die Pad) package. The output voltage can be set via an exter-  Telecom/Networking cards nal divider or to a fixed setting of 0.5V depending on how  Motherboards/Peripheral cards the FB pin is configured.  Industrial applications  Wireless infrastructure  Set top boxes  Medical equipment  Notebook computers  Battery powered systems Typical Application Circuit Rev. 3.0 © 2011 Semtech Corporation 1 SC4215H Pin Configuration Ordering Information Device Package (1)(2) SC4215HSETRT SOIC-8-EDP SC4215HEVB Evaluation Board Notes: (1) Available in tape and reel only. A reel contains 2,500 devices. (2) Available in lead-free package only. Device is WEEE and RoHS compliant and halogen free. Marking Information 2 SC4215H Absolute Maximum Ratings Recommended Operating Conditions VIN, EN, VO, FB to GND (V) . . . . . . . . . . . . . . . . . . -0.3 to +7.0 VIN (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.4 < V < 6.0 IN Power Dissipation . . . . . . . . . . . . . . . . . . . . . Internally Limited Ambient Temperature Range (°C) . . . . . . . . . -40 < T < +105 A (1) ESD Protection Level (kV) . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Junction Temperature Range (°C) . . . . . . . . . -40 < T < +125 J Maximum Output Current (A) . . . . . . . . . . . . . . . . . . . . . . . . .2 Thermal Information (2) Thermal Resistance, Junction to Ambient (°C/W) . . . . 36 (2) Thermal Resistance, Junc to Case (°C/W) . . . . . . . . . . . . 5.5 Maximum Junction Temperature (°C) . . . . . . . . . . . . . .+150 Storage Temperature Range (°C) . . . . . . . . . . . . -65 to +150 Peak IR Reflow Temperature (10s to 30s) (°C) . . . . . . +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 JEDEC standard JESD22-A114-B. (2) 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 specified: V = V , V = V , V = 1.40V to 6.0V, I = 10µA to 2A, T = 25° C. EN IN FB O IN O A Values in bold apply over the full operating temperature range. Parameter Symbol Conditions Min Typ Max Units VIN V = 3.3V, I = 0A 3 mA IN O Quiescent Current I Q V = 6.0V, V =0V 10 50 µA IN EN VO V = V + 0.5V, I = 10mA IN O O -2% +2% (1) Output Voltage V V = 1.8V, I = 0.8A, 0°C ≤ T = T ≤85°C V V O IN O J A O (Fixed Voltage, V = V ) FB O 1.40V ≤ V ≤ 6.0V, I = 10mA -3% +3% IN O (1) Line Regulation REG I =10mA 0.2 0.4 %/V (LINE) O (1) Load Regulation REG I =10mA to 2A 0.5 1.5 % (LOAD) O 3 SC4215H Electrical Characteristics (continued) Parameter Symbol Conditions Min Typ Max Units 1.4V ≤ V < 1.6V 90 400 IN I =1A O 1.6V ≤ V ≤ 6.0V 200 IN 1.4V ≤ V < 1.6V 200 500 IN (1)(2) Dropout Voltage V I =1.5A mV DO O 1.6V ≤ V ≤ 6.0V 300 IN 1.4V ≤ V < 1.6V 300 600 IN I = 2A O 1.6V ≤ V ≤ 6.0V 400 IN (3)(4) Minimum Load Current I 10 µA O (4) Current Limit I 2.1 3 4.4 A CL Feedback 0.495 0.505 (1) Reference Voltage V V = 3.3V, V = V , I =10mA 0.5 V REF IN FB OUT O 0.490 0.510 (4) Feedback Pin Current I V = V 80 200 nA ADJ FB REF EN Enable Pin Current I V = 0V, V =3.3V 1.5 10 µA EN EN IN V 1.6 IH Enable Pin Threshold V =3.3V V IN V 0.4 IL Over Temperature Protection O High Trip Level T 160 C HI O Hysteresis T 10 C HYST Notes: (1) Low duty cycle pulse testing with Kelvin connections required. (2) V = V -V when V decreases by 1.5% of its nominal output voltage with V = V +0.8V. DO IN O O IN O (3) Required to maintain regulation. Voltage set resistors R1 and R2 are usually utilized to meet this requirement. (4) Guaranteed by design. 4 SC4215H Typical Characteristics 5 SC4215H Pin Descriptions Pin # Pin Name Pin Function Enable Input. Pulling this pin below 0.4V turns the regulator off, reducing the quiescent current to 2 EN a fraction of its operating value. The device will be enabled if this pin is left open. Connect to VIN if not being used. Input voltage. For regulation at full load, the input to this pin must be between (VO+ 0.5V) and 6.0V. Minimum VIN = 1.4V. A large bulk capacitance should be placed closely to this pin to ensure 3 VIN that the input supply does not sag below 1.4V. Also a minimum of 4.7uF ceramic capacitor should be placed directly at this pin. The pin is the power output of the device. A minimum of 10uF capacitor should be placed directly 6 VO at this pin. When this pin connected to the Vo pin, the output voltage will be set at 0.5V. If external feedback 7 FB resistors are used, the output voltage will be determined by the resistor ratio (See Application Circuits on page 1): Reference ground. The GND pin and the exposed die pad must be connected together at the IC 8 GND pin. 1, 4, 5 NC No Connection. THERMAL PAD Pad for heatsinking purposes. Connect to ground plane using multiple vias. Block Diagram 6 SC4215H Applications Information (continued) Introduction ≤50kΩ). A suitable value for R2 can be chosen in the range The SC4215H is intended for applications where high of 1kΩ to 50kΩ. R1 can then be calculated from. current capability and very low dropout voltage are ((V V −− V V )) O O R RE EF F required. It provides a very simple, low cost solution that R R == R R ⋅⋅ 1 1 2 2 V V R RE EF F uses very little PCB real estate. Additional features include an enable pin to allow for a very low power consumption standby mode, and a fully adjustable output. Enable: Pulling this pin below 0.4V turns the regulator off, The SC4215H is especially recommended for applications reducing the quiescent current to a fraction of its operat- where VO>3.8V, for lower output voltage requirements ing value. A pull up resistor up to 400kOhms should be the SC4215A can be considered. connected from this pin to the VIN pin in applications where supply voltages of Vin < 1.9V are required. For Component Selection applications with higher voltages than 1.9V, EN pin could Input capacitor: A large bulk capacitance ≥ 10µF/A be left open or connected to VIN. (output load) should be closely placed to the input supply pin of the SC4215H to ensure that Vin does not sag below Thermal Considerations 1.4V. Also a minimum of 4.7µF ceramic capacitor is recom- The power dissipation in the SC4215H is given by: mended to be placed directly next to the Vin pin. This P ≈ I x (V - V ) D O IN O allows for the device being some distance from any bulk The allowable power dissipation will be dependant on the capacitance on the rail. Additionally, input droop due to thermal impedance achieved in the application. The derat- load transients is reduced, improving load transient ing curve below is valid for the thermal impedance speci- response. Additional capacitance may be added if required fied in the Thermal Information section on page 3. by the application. Output capacitor: A minimum bulk capacitance of ≥ 10µF/A (output load), along with a 0.1µF ceramic decou- pling capacitor is recommended. Increasing the bulk capacitance will improve the overall transient response. The use of multiple lower value ceramic capacitors in par- allel to achieve the desired bulk capacitance will not cause stability issues. Although designed for use with ceramic output capacitors, the SC4215H is extremely tolerant of output capacitor ESR values and thus will also work com- fortably with tantalum output capacitors. Noise immunity: In very electrically noisy environments, it is recommended that 0.1µF ceramic capacitors be placed from IN to GND and OUT to GND as close to the device pins as possible. Internal voltage selection: By connecting the FB pin directly to the VO pin, the output voltage will be regulated to the 0.5V internal reference. External voltage selection resistors: The use of 1% resistors, and designing for a current flow ≥ 10µA is rec- ommended to ensure a well regulated output (thus R2 7 SC4215H Outline Drawing — SOIC-8-EDP-2 8 SC4215H Land Pattern — SOIC-8-EDP-2 9 SC4215H © Semtech 2011 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 conse- quence of its use. Publication thereof does not convey nor imply any license under patent or other industrial or intellec- tual 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 LIFE- SUPPORT 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. Notice: All referenced brands, product names, service names and trademarks are the property of their respective owners. Contact Information Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805) 498-2111 Fax: (805) 498-3804 www.semtech.com 10