SEMTECH SC4215A

SC4215A Very Low Input /Very Low Dropout 2 Amp Regulator With Enable POWER MANAGEMENT Features Description „ Input Voltage as low as 1.4V The SC4215A is a high performance positive voltage regu- „ 400mV dropout @ 2A lator designed for use in applications requiring very low „ Adjustable output from 0.5V to 3.8V 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 SC4215A 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 SC4215A has an „ Available in SOIC-8-EDP Lead-free package, fully WEEE enable pin to further reduce power dissipation while shut- and RoHS compliant down. The SC4215A provides excellent regulation over variations in line, load and temperature. Applications The SC4215A 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 fi xed settings of 0.5V and 1.2V depending „ Motherboards/Peripheral cards on how the FB pin is confi gured. „ Industrial applications „ Wireless infrastructure „ Set top boxes „ Medical equipment „ Notebook computers „ Battery powered systems Typical Application Circuit Revision 10.0 © 2011 Semtech Corporation 1 SC4215A Pin Confi guration Ordering Information Device Package (1)(2) SC4215ASTRT SOIC-8-EDP SC4215AEVB 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. Marking Information 2 SC4215A 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, Junction to Case (°C/W) . . . . . . . . 5.5 Maximum Junction Temperature (°C) . . . . . . . . . . . . . .+150 Storage Temperature Range (°C) . . . . . . . . . . . . -65 to +150 Peak IR Refl ow Temperature (10s to 30s) (°C) . . . . . . +260 Exceeding the above specifi cations may result in permanent damage to the device or device malfunction. Operation outside of the parameters specifi ed 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 specifi ed: 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 = 0) FB 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 SC4215A 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 (5) Feedback Pin Threshold V 0.05 0.10 0.15 V TH(FB) 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. DO IN O O (3) Required to maintain regulation. Voltage set resistors R1 and R2 are usually utilized to meet this requirement. (4) Guaranteed by design. (5) When V exceeds this threshold, the “Sense Select” switch disconnects the internal feedback chain from the error amplifi er and connects V FB FB instead. 4 SC4215A Typical Characteristics 5 SC4215A Pin Descriptions Pin # Pin Name Pin Function Enable Input. Pulling this pin below 0.4V turns the regulator off , reducing the quiescent current to 2EN 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 6VO at this pin. When this pin is grounded, an internal resistor divider sets the output voltage to 1.2V. If connected 7FB to the Vo pin, the output voltage will be set at 0.5V. If external feedback 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 SC4215A Applications Information (continued) Introduction ≤50kΩ). A suitable value for R2 can be chosen in the range The SC4215A 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 REF REF required. It provides a very simple, low cost solution that R R = =R R ⋅⋅ 11 22 V V REF REF uses very little PCB real estate. Additional features include an enable pin to allow for a very low power consumption The highest output voltage achievable with external resis- standby mode, and a fully adjustable output. tors is 4V. An attempt to set a higher voltage may result in V not being exceeded which will force the device into FB(TH) Component Selection the 1.2V output mode. Input capacitor: A large bulk capacitance ≥ 10μF/A The SC4215H does not have this limitation and is recom- (output load) should be closely placed to the input supply mended for applications requiring V above 3.8V. O pin of the SC4215A to ensure that Vin does not sag below 1.4V. Also a minimum of 4.7μF ceramic capacitor is recom- Enable: Pulling this pin below 0.4V turns the regulator off , mended to be placed directly next to the Vin pin. This reducing the quiescent current to a fraction of its operat- allows for the device being some distance from any bulk ing value. A pull up resistor up to 400kOhms should be capacitance on the rail. Additionally, input droop due to connected from this pin to the VIN pin in applications load transients is reduced, improving load transient where supply voltages of Vin < 1.9V are required. For response. Additional capacitance may be added if required applications with higher voltages than 1.9V, EN pin could by the application. be left open or connected to VIN. Output capacitor: A minimum bulk capacitance of ≥ Thermal Considerations 10μF/A (output load), along with a 0.1μF ceramic decou- The power dissipation in the SC4215A is given by: pling capacitor is recommended. Increasing the bulk P P ≈ ≈II ⋅⋅() () V V − −V V D D O O IN IN O O capacitance will improve the overall transient response. The use of multiple lower value ceramic capacitors in par- The allowable power dissipation will be dependant on the allel to achieve the desired bulk capacitance will not cause thermal impedance achieved in the application. The derat- stability issues. Although designed for use with ceramic ing curve below is valid for the thermal impedance speci- output capacitors, the SC4215A is extremely tolerant of fi ed in the Thermal Information section on page 3. 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 to GND, an internal resistor divider will regulate the output voltage to 1.2V. If the FB pin is connected 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 fl ow ≥ 10μA is rec- ommended to ensure a well regulated output (thus R2 7 SC4215A Outline Drawing — SOIC-8-EDP-2 8 SC4215A Land Pattern — SOIC-8-EDP-2 9 SC4215A © 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 specifi ed maximum ratings or operation outside the specifi ed 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 offi cers, employees, subsidiaries, affi liates, 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