SEMTECH SC4216

SC4216 Very Low Input /Very Low Dropout 3 Amp Regulator With Enable POWER MANAGEMENT Features Description n Input Voltage as low as 1.45V The SC4216 is a high performance positive voltage regula- n 500mV dropout @ 3A tor designed for use in applications requiring very low n Adjustable output from 0.5V to 3.8V input voltage and very low dropout voltage at up to 3 n Over current and over temperature protection amperes. It operates with a Vin as low as 1.45V, with output n Enable pin voltage programmable as low as 0.5V. The SC4216 features n 10μA quiescent current in shutdown ultra low dropout, ideal for applications where Vout is very n Full industrial temperature range close to Vin. Additionally, the SC4216 has an enable pin to n Available in SOIC-8-EDP Lead-free package, fully WEEE further reduce power dissipation while shut- down. The and RoHS compliant SC4216 provides excellent regulation over variations in line, load and temperature. Applications The SC4216 is available in the SOIC-8-EDP (Exposed Die Pad) package. The output voltage can be set via an exter- n Telecom/Networking cards nal divider or to # xed settings of 0.5V and 1.2V depending n Motherboards/Peripheral cards on how the FB pin is con# gured. n Industrial applications n Wireless infrastructure n Set top boxes n Medical equipment n Notebook computers n Battery powered systems Typical Application Circuit January 28, 2009 © 2009 Semtech Corporation 1 SC4216 Pin Con! guration Ordering Information Device Package (1)(2) SC4216STRT SOIC-8-EDP SC4216EVB 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 SC4216 Absolute Maximum Ratings Recommended Operating Conditions VIN, EN, VO, FB to GND (V) . . . . . . . . . . . . . . . . . . -0.3 to +7.0 VIN (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.45 < V < 5.5 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) . . . . . . . . . . . . . . . . . . . . . . . . .3 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 Re% ow Temperature (10s to 30s) (°C) . . . . . . +260 Exceeding the above speci# cations may result in permanent damage to the device or device malfunction. Operation outside of the parameters speci# 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 speci# ed: V = V , V = V , V = 1.45V to 5.5V, I = 10μA to 3A, 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 = 5.5V, V =0V 10 50 μA IN EN VO (1) V = V + 0.5V, I = 10mA -2% +2% Output Voltage IN O O V V V O O (Fixed Voltage, V = 0) FB 1.45V ≤ V ≤ 5.5V, I = 10mA -3% +3% IN O (1) Line Regulation REG I =10mA 0.2 0.4 %/V (LINE) O (1) Load Regulation REG 10mA ≤ I ≤ 3A, 1.6V ≤ V ≤ 5.5V 0.25 1.0 % (LOAD) O IN 75 150 I =500mA O 200 (1)(2) Dropout Voltage V mV DO 150 250 I =1A O 300 3 SC4216 Electrical Characteristics (continued) Parameter Symbol Conditions Min Typ Max Units 250 350 I =1.5A O 400 300 400 I = 2A O 500 350 450 (1)(2) Dropout Voltage V I = 2.5A mV DO O 600 450 550 I =3A O 700 400 500 I = 3A, 1.6V ≤ V ≤ 5.5V O IN 650 (3)(4) Minimum Load Current I 10 μA O (4) Current Limit I 3.5 4.5 5.0 A CL Feedback V = 3.3V, V = V , I =10mA 0.495 0.5 0.505 IN FB OUT O (1) Reference Voltage V V REF 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 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. (5) When V exceeds this threshold, the “Sense Select” switch disconnects the internal feedback chain from the error ampli# er and connects V FB FB instead. 4 SC4216 Typical Characteristics 5 SC4216 Pin Descriptions Pin # Pin Name Pin Function Enable Input. Pulling this pin below 0.4V turns the regulator o* , 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 5.5V. Minimum VIN = 1.45V. 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 is grounded, an internal resistor divider sets the output voltage to 1.2V. If connected 7 FB 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 SC4216 Applications Information (continued) Introduction ≤50kΩ). A suitable value for R2 can be chosen in the range The SC4216 is intended for applications where high of 1kΩ to 50kΩ. R1 can then be calculated from. current capability and very low dropout voltage are ( (VV − −VV ) ) O O RE REFF required. It provides a very simple, low cost solution that RR = =RR ⋅⋅ 11 22 VV RE REFF 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 SC4216H 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 SC4216 to ensure that Vin does not sag below 1.45V. Also a minimum of 4.7μF ceramic capacitor is rec- Enable: Pulling this pin below 0.4V turns the regulator o* , ommended 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 SC4216 is given by: pling capacitor is recommended. Increasing the bulk PP ≈ ≈II ⋅⋅ ( (VV − −VV ) ) DD 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 SC4216 is extremely tolerant of # 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 % ow ≥ 10μA is rec- ommended to ensure a well regulated output (thus R2 7 SC4216 Outline Drawing — SOIC-8-EDP-2 8 SC4216 Land Pattern — SOIC-8-EDP-2 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 9