SEMTECH SC4211

SC4211 Very Low Input /Very Low Dropout 1 Amp Regulator With Enable PO POWER MANA WER MANAGEMENT GEMENT Description Features The SC4211 is a high performance positive voltage ‹ Input Voltage as low as 1.4V regulator designed for use in applications requiring very ‹ 400mV dropout @ 1A low Input voltage and very low dropout voltage at up to ‹ Adjustable output from 0.5V 1 amperes. It operates with a Vin as low as 1.4V, with ‹ Over current and over temperature protection output voltage programmable as low as 0.5V. The ‹ Enable pin SC4211 features ultra low dropout, ideal for applications ‹ 10µA quiescent current in shutdown where Vout is very close to Vin. Additionally, the SC4211 ‹ Full industrial temperature range has an enable pin to further reduce power dissipation ‹ Available in SOIC-8-EDP Lead-free package, fully while shutdown. The SC4211 provides excellent regula- WEEE and RoHS compliant tion over variations in line, load and temperature. Applications The SC4211 is available in the SOIC-8-EDP (Exposed Die ‹ Telecom/Networking cards Pad) package. Depending on how the FB pin is config- ‹ Motherboards/Peripheral cards ured, the output voltage can be either externally adjusted ‹ Industrial Applications or fixed to either 0.5V or 1V. ‹ Wireless infrastructure ‹ Set top boxes ‹ Medical equipment ‹ Notebook computers ‹ Battery powered systems Typical Application Circuits SC4211 4 5 NC NC 3 6 VIN VIN VO VO 0.5(R1 +R2) 2 7 VO = Volts ENABLE EN FB R2 1 8 R1 NC GND U1 C1 C2 R2 SC4211 SC4211 5 4 5 4 NC NC NC NC 6 3 6 3 VIN VO VIN VIN VO VO = 0.5V VIN VO = 1V 7 2 2 7 EN FB ENABLE EN FB ENABLE 1 1 8 8 NC GND NC GND U1 U1 C1 C2 C1 C2 Revision: November 06, 2008 1 www.semtech.com SC4211 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 Sx ymbol Ms a Unit Vin, EN, Vo, FB to GND 7V Power Dissipation PIW nternally Limited D (1) Thermal Resistance Junction to Ambient 3W 6 °C/ θ JA (1) Thermal Resistance Junction to Case 5W .5 °C/ θ JC Operating Ambient Temperature Range T -C 40 to +85 ° A Operating Junction Temperature Range T -C 40 to +125 ° J Storage Temperature Range T -C 65 to +150 ° STG Peak IR Reflow Temperature (10s to 30s) T 2C 60 ° P (2) ESD Rating (Human Body Model) V 2V k ESD Notes: (1) 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, (2) Tested according to JEDEC standard JESD22-A114-B. Electrical Characteristics Unless specified: V = V , V = V V = 1.40V to 6.0V, I = 10µA to 1A. EN IN FB O, IN O Values in bold apply over the full operating temperature range. Pl arameter Ss ymbo Tn estCondition Mp i Tx y Ms a Unit VIN SV upply Voltage Range 10 .40 6. V IN QI uiescent Current V = 3.3V, I = 0A 3 mA Q IN O V = 6.0V, V=0 0V 1 50 µA IN EN VO (1) Output Voltage V V = V + 0.5V, I=% 10mA -V 2 +V 2% O IN O O O (Fixed Voltage, V = 0) 1.40V ≤ V ≤ 6.0V, I = 10mA -% 3% +3 IN O FB (1) Line Regulation REG I=2 10mA 0. 0.4 %/V (LINE) O (1) Load Regulation REG I=5 10mA to 1A 0. 1.5 %/V (LOAD) O (1)(2) Dropout Voltage V I=0 500mA 10 0 2V 5 m DO O 300  2007 Semtech Corp. 2 www.semtech.com SC4211 POWER MANAGEMENT Electrical Characteristics (Cont.) Unless specified: V = V , V = V V = 1.40V to 6.0V, I = 10µA to 1A. EN IN FB O, IN O Values in bold apply over the full operating temperature range. Pl arameter Ss ymbo Tn estCondition Mp i Tx y Ms a Unit VO(Cont.) (1)(2) 20 00 40 Dropout Voltage V I = 1A mV DO O 500 (3) Minimum Load Current I V = V + 0.5V 10 µA O IN O (4) Current Limit I 1.1 1.5 2.0 A CL Feedback (1) Reference Voltage V V = 3.3V, V = V , I=5 10mA 05 .49 05 . 0V .50 REF IN FB OUT O Full I , and V Range 00 .490 0.51 OUT IN (4) Feedback Pin Current I V = V 80 200 nA ADJ FB REF (5) Feedback Pin Threshold V 0.05 0.16 0.40 V TH(FB) EN EI nable Pin Current V = 0V, V=5 3.3V 1. 10 µA EN EN IN EV nable Pin Threshold V = 3.3V 1.6 V IH IN V V = 3.3V 0.4 IL IN Over Temperature Protection HT igh Trip level 1C 60 ° HI HT ysteresis 1C 0 ° 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 FB amplifier and connects V instead. FB  2007 Semtech Corp. 3 www.semtech.com SC4211 POWER MANAGEMENT Ordering Information Pe artNumber PT ackag Temp.Range ( ) J (1)(2) O SC4211STRTS5 OIC-8-EDP -40 to +12 C Sd C4211EVB Evaluation Boar Notes: (1) Only available in tape and reel packaging. A reel con- tains 2500 devices. (2) Lead-free product. This product is fully WEEE and RoHS compliant. Pin Configuration Top View Bottom View GND NC GND GND 8 1 NC FB 7 Exposed EN FB 2 EN Die Pad 6 VIN VO 3 VIN VO 5 4 NC NC NC NC SOIC-8-EDP-2 SOIC-8-EDP-2 Pin Descriptions Pe in # Pn in Nam Pin Desciptio 2N E Enable Input. Pulling this pin below 0.4V turns the regulator off, reducing the quiescent current to a fraction of its operating value. The device will be enabled if this pin is left open. Connect to VIN if not being used. 3N VI Input voltage. For regulation at full load, the input to this pin must be between (VO+ 0.5V) and 5.5V. Minimum VIN = 1.4V. A large bulk capacitance should be placed closely to this pin to ensure 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. 6O V The pin is the power output of the device. A minimum of 10uF capacitor should be placed directly at this pin. 7B F 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): 0.5(R1 +R2) VO = Volts R2 8D GN Reference ground. The GND pin and the exposed die pad must be connected together at the IC pin. 1C ,4,5N. No Connection THERMAL Pad for heatsinking purposes. Connect to ground plane using multiple vias. Not electrically connected PAD internally.  2007 Semtech Corp. 4 www.semtech.com SC4211 POWER MANAGEMENT Block Diagram FB FB FB FB FB 1.5uA 0.5V 0.5V 0.5V 0.5V 0.5V 8V REF REF REF REF REF Marking Information Top View SC4211 yyww xxxxx yyww = Datecode (Example: 0015) xxxxx = Semtech Lot No. (Example: 00101)  2007 Semtech Corp. 5 www.semtech.com SC4211 POWER MANAGEMENT Typical Characteristics Region of Instability Stable Region Region of Instability Region of Instability Stable Region Region of Instability  2007 Semtech Corp. 6 www.semtech.com SC4211 POWER MANAGEMENT Applications Information Introduction Enable: Pulling this pin below 0.4V turns the regulator off, reducing the quiescent current to a fraction of its The SC4211 is intended for applications where high cur- operating value. A pull up resistor up to 400kOhms should rent capability and very low dropout voltage are required. be connected from this pin to the VIN pin in application It provides a very simple, low cost solution that uses very where supply voltages of Vin < 1.9V is required. For ap- little PCB real estate. Additional features include an en- plications with higher voltages than 1.9V, EN pin could able pin to allow for a very low power consumption standby be left open or connected to VIN. mode, and a fully adjustable output. Thermal Considerations Component Selection The power dissipation in the SC4211 is approximately Input capacitor: A large bulk capacitance of about equal to the product of the output current and the input ≥ 10uF/A (output load) should be closely placed to the to output voltage differential: input supply pin of the SC4211 to ensure that Vin does not sag below 1.4V. Also a minimum of 4.7µF ceramic P ≈() VIN − VOUT •I D O capacitor is recommended to be placed directly next to the Vin pin. This allows for the device being some dis- The absolute worst-case dissipation is given by: tance from any bulk capacitance on the rail. Additionally, input droop due to load transients is reduced, improving () P = VIN − VOUT •I + VIN •I D(MAX) (MAX) (MIN) O(MAX) (MAX) Q(MAX) load transient response. Additional capacitance may be added if required by the application. For a typical scenario, V = 3.3V ± 5%, V = 2.8V and IN OUT I = 1A, therefore: O Output capacitor: A minimum bulk capacitance of ≥ 10µF/A (output load), along with a 0.1µF ceramic de- V = 3.465V, V = 2.744V and I = 1.75mA, IN(MAX) OUT(MIN) Q(MAX) coupling capacitor is recommended. Increasing the bulk capacitance will improve the overall transient response. Thus P = .722W. D(MAX) The use of multiple lower value ceramic capacitors in parallel to achieve the desired bulk capacitance will not Using this figure, and assuming T = 70°C, we can cal- A(MAX) cause stability issues. Although designed for use with ce- culate the maximum thermal impedance allowable to main- ramic output capacitors, the SC4211 is extremely toler- tain T ≤ 150°C: J ant of output capacitor ESR values and thus will also work comfortably with tantalum output capacitors. () T −T () 150−70 J(MAX) A(MAX) R = = =110°C/W TH(J−A)(MAX) Noise immunity: In very electrically noisy environments, P .722 D(MAX) it is recommended that 0.1µF ceramic capacitors be placed from IN to GND and OUT to GND as close to the This should be achievable for the SOIC-8-EDP package device pins as possible. using PCB copper area to aid in conducting the heat away, such as one square inch of copper connected to the ground Internal voltage selection: By connecting the FB pin to pins of the device. Internal ground/power planes and air GND, an internal resistor divider will regulate the output flow will also assist in removing heat. For higher ambient voltage to 1.0V. If the FB pin is connected directly to the temperatures it may be necessary to use additional cop- VO pin, the output voltage will be regulated to the 0.5V per area. internal reference. External voltage selection resistors: The use of 1% resistors, and designing for a current flow ≥ 10µA is recommended to ensure a well regulated output (thus R2 ≤ 50kΩ).  2007 Semtech Corp. 7 www.semtech.com SC4211 POWER MANAGEMENT Outline Drawing - SOIC-8-EDP A D e DIMENSIONS N INCHES MILLIMETERS DIM MIN NOM MAX MIN NOM MAX - - A .053 .069 1.35 1.75 2X E/2 .000 - .005 0.00 - 0.13 A1 - - A2 .049 .065 1.25 1.65 E1 E - - b .012 .020 0.31 0.51 c - - .007 .010 0.17 0.25 D .189 .193 .197 4.80 4.90 5.00 12 E1 .150 .154 .157 3.80 3.90 4.00 E .236 BSC 6.00 BSC ccc C e .050 BSC 1.27 BSC 2X N/2 TIPS e/2 F .116 .120 .130 2.95 3.05 3.30 H .085 .095 .099 2.15 2.41 2.51 B - - h .010 .020 0.25 0.50 L .016 .028 .041 0.40 0.72 1.04 D (.041) (1.05) L1 N 8 8 aaa C - - 01 0° 8° 0° 8° A2 A aaa .004 0.10 SEATING bbb .010 0.25 PLANE C A1 ccc .008 0.20 bxN bbb C A-B D h F EXPOSED PAD h H H c GAGE PLANE 0.25 L 01 (L1) DETAIL A SEE DETAIL A SIDE VIEW NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. DATUMS AND TO BE DETERMINED AT DATUM PLANE -A- -B- -H- 3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. 4. REFERENCE JEDEC STD MS-012, VARIATION BA.  2007 Semtech Corp. 8 www.semtech.com SC4211 POWER MANAGEMENT Land Pattern - SOIC-8-EDP E SOLDER MASK D DIMENSIONS DIM INCHES MILLIMETERS (.205) (5.20) C Z (C) D .134 3.40 G F E .201 5.10 F .101 2.56 G .118 3.00 Y P .050 1.27 X .024 0.60 THERMAL VIA P Y .087 2.20 Ø 0.36mm X Z .291 7.40 NOTES: 1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. 2. REFERENCE IPC-SM-782A, RLP NO. 300A. 3. THERMAL VIAS IN THE LAND PATTERN OF THE EXPOSED PAD SHALL BE CONNECTED TO A SYSTEM GROUND PLANE. FAILURE TO DO SO MAY COMPROMISE THE THERMAL AND/OR FUNCTIONAL PERFORMANCE OF THE DEVICE. Contact Information Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804  2007 Semtech Corp. 9 www.semtech.com