SC633 Fixed 5.3V Output Charge Pump Regulator POWER MANAGEMENT Features Description Input voltage range — 2.9V to 5.5V VOUT tolerance — 5.3V ±3% Continuous output current — 275mA, VIN=3V Peak output current — 400mA Three charge pump modes — 1x, 1.5x and 2x Output ripple ≤ 40mVPP for IOUT ≤ 400mA Short circuit, over-voltage, and over-temperature protection Soft-start functionality Shutdown current — 0.1µA, typical Ultra thin package — 2 x 2 x 0.6 (mm) Lead-free and halogen-free WEEE and RoHS compliant The SC633 is a high-current voltage regulator using Semtech’s proprietary low-noise charge pump technology. Performance is optimized for use in single Li-Ion battery cell applications. The regulator provides the performance of a linear, low drop-out (LDO) voltage regulator when the input is greater than 5.3V. Unlike an LDO, dropout is avoided when the input is less than 5.3V. Instead, a charge pump is activated to provide voltage boost and the head-room needed for voltage regulation. Only two 2.2µF bucket capacitors are required to deliver the full output current. The charge pump provides a low EMI solution compared to inductive boost regulators. Applications The SC633’s charge pump has three modes of operation: 2x, 1.5x, and 1x modes. The 2x and 1.5x modes deliver current to the load in each of two phases. The 1x mode turns off the charge pump, delivering current through an LDO. When active, the charge pump provides low-ripple operation at 200kHz, which is typically less than 30mVpp at the output. The SC633 is capable of delivering 275mA continuous current, with peak current to 400mA. A 22µF output capacitor is used for decoupling the load and for smoothing mode transitions. Hysteresis is provided to prevent chatter between charge pump modes. Mobile phones MP3 players USB On-The-Go Multi-LED backlit LCDs Compact flash/CF+ products PMPs Digital video cameras Digital still cameras PDAs Typical Application Circuit C IN 22µF V BAT IN OUT V O U T = 5.3V @ 275m A C OUT 22µF SC633 C hip enable EN GND C 1+ C 1- C1 2.2µF C 2+ C 2- C2 2.2µF US Patent: 7,808,220 Rev 2.0 SC633 Pin Configuration GND Ordering Information 1 8 C 2- T O P V IE W C 1+ 2 7 C 2+ C 1- 3 6 OUT 5 EN T IN 4 MLPD-UT-8; 2x2, 8 LEAD θJA = 68°C/W Device Package SC633ULTRT(1)(2) MLPD-UT-8 2x2 SC633EVB Evaluation Board Notes: (1) Available in tape and reel only. A reel contains 3,000 devices. (2) Lead-free packaging only. Device is WEEE and RoHS compliant, and halogen-free. Device Options Part Num nnn Features SC630A K0A 1 MHz, 3.3V, smaller Cin and Cout SC632A K2A 1 MHz, 5V, smaller Cin and Cout SC632 632 200 kHz, 5.0V SC630 630 200 kHz, 3.3V SC633 633 200 kHz, 5.3V Marking Information nnn yw nnn=Part Number Oyw = Pin 1 and Datecode SC633 Absolute Maximum Ratings Recommended Operating Conditions IN (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +6.0 Ambient Temperature Range (°C). . . . . . . . . -40 ≤ TA ≤ +85 OUT (V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +6.0 IN (V)..... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.9 ≤ VIN ≤ 5.5 C1+, C2+ (V) . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to (VOUT + 0.3) Pin Voltage — All Other Pins (V). . . . . . . . . -0.3 to (VIN + 0.3) OUT pin — Short Circuit Duration . . . . . . . . . . . Continuous ESD Protection Level(2) (kV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Thermal Information Thermal Resistance, Junction to Ambient(1) (°C/W) . . . . 68 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) Calculated from package in still air, mounted to 3 x 4.5 (in), 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 otherwise specified: TA = +25°C for Typ, -40°C to +85°C for Min and Max; C1 = C2 = 2.2µF (ESR < 0.03Ω); CIN = COUT = 22µF; VIN = 2.9V to 5.5V Parameter Symbol Condition Min Typ Max Units Output Voltage VOUT VIN = 4.2V, IOUT = 1mA 5.14 5.3 5.46 V Output Voltage Ripple VPP IOUT ≤ 400mA Maximum Output Current IOUT 40 mV Peak Load - thermally limited(1), TJ <150°C, 3.3V ≤ VIN ≤ 5.0V 400 mA Continuous Load, 3.10V ≤ VIN ≤ 4.2V 275 mA Shutdown Current ISD Shutdown (EN = GND), VIN = 3.6V 0.1 2 µA Total Quiescent Current IQ EN high, IOUT = 1mA, Vin=4.2V 1.5 2.5 mA Charge Pump Frequency fPUMP VIN = 3.2V 200 260 kHz tSU (EN transitions from low to high), 5.14V ≤ VOUT ≤ 5.46V, No load Line Regulation ΔVLINE IOUT = 1mA, 2.85V ≤ VIN ≤ 4.2V 21 mV Load Regulation ΔVLOAD VIN =4.2V, 1mA ≤ IOUT ≤ 400mA 37.5 mV VIH VIN = 5.5V Start-Up Time EN Input High Threshold 140 400 1.6 µs V SC633 Electrical Characteristics (continued) Parameter Symbol Condition EN Input Low Threshold VIL EN Input High Current EN Input Low Current Open-Loop Output Resistance Mode Transition Voltage (2) Min Typ Max Units VIN = 2.7V 0.4 V IIH VIN = 5.5V 2 µA IIL VIN = 5.5V 2 µA 1x mode 0.25 Ω 1.5x mode, VIN = 3.7V 2.85 Ω 2x mode, VIN = 3.1V 2.9 Ω V TRANS 1X IOUT = 200mA 5.32 V V TRANS 1.5X IOUT = 200mA 3.86 V ISC VOUT = 0V, IOUT = IIN 300 600 980 mA VOUT > 2V, 1x mode 0.6 1.2 2.0 A VOUT > 2V, 1.5x and 2x modes 1.2 2.0 2.8 A ROUT Fault Protection Short-Circuit Current Input Current Limit Over Temperature ILIMIT VOUT ≤ 2V, IOUT = IIN 700 mA TOTP Rising Threshold 165 °C THYS Hysteresis(3) 20 °C Notes: (1) Thermal limitation is dependent upon the thermal performance of the printed circuit board in support of the package standard of 68° C/W. (2) Voltage at the IN pin where a mode transition takes place in the charge pump with VIN falling. (3) Guaranteed by design — not tested in production. SC633 Typical Characteristics Line Regulation Load Regulation PSRR versus Frequency — 1.0x Mode PSRR versus Frequency — 1.5x Mode Vin=5.5V, Vout=5.3V, 50mA, 1X mode Vin=4.7V, Vout=5.3V, 50mA, 1.5X mode CIN=COUT=22µF (0805) CIN=COUT=22µF (0805) C1=C2=2.2µF (0603) C1=C2=2.2µF (0603) Quiescent Current PSRR versus Frequency — 2x Mode VOUT = 5.3V, IOUT = 0mA IQ (mA) Vin=3.5V, Vout=5.3V, 50mA, 2X mode CIN=COUT=22µF (0805) C1=C2=2.2µF (0603) SC633 Typical Characteristics (continued) Efficiency — 10mA Efficiency — 50mA Efficiency — 100mA Efficiency — 200mA Efficiency — 300mA Efficiency — 400mA SC633 Typical Characteristics (continued) Ripple — 1.5x Mode Ripple — 1x Mode VIN = 4.2V, VOUT= 5.3V, IOUT = 400mA VIN = 5.5V, VOUT = 5.3V, IOUT = 400mA VOUT -PP (20mV/div) VOUT -PP (50mV/div) IOUT (200mA/div) IOUT (200mA/div) CIN=COUT=22µF (0805) CIN=COUT=22µF (0805) C1=C2=2.2µF (0603) C1=C2=2.2µF (0603) Time (4µs/div) Time (4µs/div) Startup (No Load) Ripple — 2x Mode VIN = 3.3V, VOUT = 5.3V, IOUT = 400mA VIN = 3.6V, IOUT = 0mA VOUT -PP VEN (1V/div)– (100mV/div) IOUT (200mA/div) VOUT (2V/div)– CIN=COUT=22µF (0805) CIN=COUT=22µF (0805) C1=C2=2.2µF (0603) C1=C2=2.2µF (0603) Time (100µs/div) Time (4µs/div) Mode Transition at Load =240mA Startup (400mA) Vin = 3V to 5.5V, Vout=5.3V, IOUT = 240mA VIN = 5V, IOUT = 400mA CIN=COUT=22µF (0805) IOUT (200mA/div) C1=C2=2.2µF (0603) VEN (1V/div)– VIN (1V/div, Ch1)– IOUT (200mA/div) VOUT (200mV/div)– VOUT (2V/div)– CIN=COUT=22µF (0805) – C1=C2=2.2µF (0603) – Time (200µs/div) SC633 Pin Descriptions Pin Pin Name Pin Function 1 GND Ground — connect to ground plane with multiple vias 2 C1+ Positive terminal of bucket capacitor 1 3 C1- Negative terminal of bucket capacitor 1 4 IN Input supply voltage 5 EN Chip enable — active-high 6 OUT Output 7 C2+ Positive terminal of bucket capacitor 2 8 C2- Negative terminal of bucket capacitor 2 T Thermal Pad This pad is for heat sinking and is not connected internally. It must be connected to a ground plane using multiple vias. SC633 Block Diagram IN 4 LD O 2 C 1+ 200 kH z EN 5 Logic C ontrol R eference V oltage G enerator CHARGE PUMP 3 C1- 7 C 2+ 8 C2- 6 OUT 1 GND SC633 Applications Information General Description The SC633 is a 5.3V output charge pump regulator designed to support up to peak current of 400mA (TA ≤ 55°C, 3.3V ≤ VIN ≤ 4.2V) and 275mA (TA ≤ 85°C, 3.15V ≤ VIN ≤ 5.5V) of continuous current for powering 5.0V devices in portable handheld equipment including Compact Flash and CF+ products. The SC633 has three operating modes — 1x, 1.5x, and 2x. The 1x mode is a linear series regulation mode with a low open-loop output resistance of only 250mW. The 1x mode functions as a low-noise series linear regulator. The 1.5x and 2x modes are a low noise, constant frequency, constant duty cycle switch mode, using two bucket capacitors. One bucket supports the full output current while the other bucket charges from the input. The two buckets exchange roles in the next phase, supplying continuous output current in both phases and reducing the need for a large output decoupling capacitor. The constant frequency, constant duty cycle operation also produces predictable constant frequency harmonics. output current related to the operation efficiency. The following derating curve is obtained based on efficiency at input voltage of 5V and 3.3V. For any input conditions, due to the mode hysteresis, SC633 operation mode might be determined from its previous operation voltage, it could be in 1X, 1.5X, or 2X mode. The low efficiency should always be used for worst case consideration. In this case, at VIN =3.3V, SC633 operates in 2X mode. At VIN =5V, SC633 operates either in 2X or 1.5X mode. In the derating curve below, the DC operating points beneath each curve are in the safe operating temperature range of the MLP package. Thermal Resistance The SC633 package is thermally efficient when the circuit board layout connects the thermal pad through multiple vias to the ground plane. The thermal resistance rating is dependent upon the connection between the thermal pad and the ground plane. A layout that is done correctly should keep the junction temperature below the overtemperature limit while operating the SC633 within the specified electrical conditions. A poor layout may allow the junction temperature to reach the over temperature limit, so it is important to maintain adequate ground plane around the device to maximize heat transfer to the PCB. Temperature Derating The maximum power dissipation of the package can be calculated by the difference between the junction temperature of 150 degree and the ambient temperature divided by the thermal impedance 68 °C/W. The higher the ambient temperature, the lower the maximum allowable power dissipation. At a given V IN condition, the allowable power dissipation will correlates to the specific Maximum Continuous Output Mode Transition As input voltage varies, the SC633 will experience mode transitions. The transition threshold changes with input voltage and load conditions. The mode change hysteresis at several load current conditions are shown in the operating curves on page 6. Mode transition will bring output voltage dip or overshoots. The output voltage deviation in mode transition can be improved by using larger output capacitors if the output voltage going beyond the regulation range. Mode Transition Hysteresis Hysteresis is provided to prevent chatter between charge pump modes for input steps of up to 120mV. Decouple the input to prevent steps greater than 120mV, for 10 SC633 Applications Information (continued) optimum transient performance, when the input voltage reaches the mode transition thresholds. that prevents the device from re-enabling until the junction temperature is reduced by 20°C. Protection Circuitry Capacitor Selection The SC633 also provides protection circuitry that prevents the device from operating in an unspecified state. These functions include: • • • Over-Current Protection (OCP) Short-Circuit Current Protection (SCCP) Over-Temperature Protection (OTP) Over-Current Protection Over-current protection is provided to limit the output current. When VOUT is greater than 2V, OCP limits the output to 1A typical. The threshold at 2V allows the device to recover from excessive voltage droop during an over current. Short-Circuit Current Protection Short-circuit current protection is provided to limit the current that can be sourced when the output is shorted to ground. When a short circuit forces VOUT to drop below 2V, the SCCP detects the condition and limits the output current to 600mA (typical). Over-Temperature Protection The over-temperature circuit helps prevent the device from overheating and experiencing a catastrophic failure. When the junction temperature exceeds 165°C, the device is disabled. It remains disabled until the junction temperature drops below this threshold. Hysteresis is included The SC633 is designed to use low-ESR ceramic capacitors for the input and output bypass capacitors as well as the charge pump bucket capacitors. Ideal performance is achieved when the bucket capacitors are exactly equal. The value of input and output decoupling capacitors will vary with system requirements. For best ripple performance CIN and COUT are normally 22µF and the bucket capacitors C1 and C2 are 2.2µF. For low profile designs, two 10µF capacitors may be used in place of each 22µF. When selecting capacitors for an application, first consider the DC voltage characteristic of the capacitor. The value of capacitance at the DC operating voltage may be considerably lower than the rated value. The following table lists recommended capacitor values which have been chosen to minimize the impact of this limitation. Table 1 — Recommended Capacitors Capacitor Value μF Case Size Notes Typical output VPP ≤ 20mV in all charge pump modes CIN , COUT 22 0805 CBUCKET 2.2 0603 Required for the full rated output current CBUCKET 2.2 0402 Useful for load current up to 300mA Typical input ripple ≤ 100mV in all charge pump modes NOTE: Use only X5R type capacitors, with a 6.3V rating or higher The highest capacitance values in the smallest package sizes will tend to have poor DC voltage characteristics. The highest value 0402 size capacitor retains as little as 35% of its rated value at 5VDC. The same value chosen in the next larger package size, 0603, will retain about 60% of its rated value at 5VDC. 11 SC633 Applications Information (continued) PCB Layout Considerations Poor layout can degrade the performance of the regulator and can be a contributory factor in EMI problems, ground bounce, thermal issues, and resistive voltage losses. Poor regulation and instability can result. The following design rules are recommended: . Place the bucket capacitors as close to the device as possible and on the same side of the board. Use short wide copper areas between the capacitor pins and the device pins. 2. Place the input and output decoupling capacitors as close as possible to the device and connect these capacitors’ ground pads together to the ground plane using multiple vias through a short wide copper area. 3. Connect pin 1 directly to the copper area under the thermal pad. 4. The thermal pad at the center of the device is not electrically connected. Connect this pad to the ground plane using multiple vias. 5. Use a ground plane to further reduce noise interference on sensitive circuit nodes. SC633 C2- GND C1 C1+ GND C2 C2+ C1- OUT IN EN C OUT C IN EN 12 SC633 Outline Drawing — MLPD-UT-8 2x2 B D A D IM E N S IO N S D IM E P IN 1 IN D IC A T O R (LA S E R M A R K ) A S E A T IN G P LA N E aaa C A2 A1 C A A1 A2 b D D1 E E1 e L N aaa bbb IN C H E S M IN .020 .000 NOM (.006 ) M ILLIM E T E R S MAX .024 .002 .007 .075 .061 .075 .026 .012 .010 .079 .083 .067 .071 .083 .079 .031 .035 .020 B S C .012 .014 .016 8 .003 .004 M IN 0.50 0.00 NOM - (0.1524 ) 0.18 0.25 1.90 2.00 1.55 1.70 1.90 2.00 0.65 0.80 0 .50 B S C 0.30 0.35 8 0.08 0.10 MAX 0.60 0.05 0.30 2.10 1.80 2.10 0.90 0.40 D1 1 E /2 2 LxN E1 N bxN bbb e C A B e/2 D /2 NO TES: 1. C O N T R O LLIN G D IM E N S IO N S A R E IN M ILLIM E T E R S (A N G LE S IN D E G R E E S ). 2. C O P LA N A R IT Y A P P LIE S T O T H E E X P O S E D P A D A S W E LL A S T H E T E R M IN A LS . 13 SC633 Land Pattern — MLPD-UT-8 2x2 H R (C ) D IM E N S IO N S K G Z Y P D IM IN C H E S M ILLIM E T E R S C (.077 ) (1 .95 ) G .047 1 .20 H .067 1 .70 K .031 0 .80 P .020 0 .50 R .006 0 .15 X .012 0 .30 Y .030 0 .75 Z .106 2 .70 X NO TES: 1. C O N T R O LLIN G D IM E N S IO N S A R E IN M ILLIM E T E R S (A N G LE S IN D E G R E E S ). 2. T H IS LA 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 LY . C O N S U LT 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 LIN E S A R E M E T . 3. T H E R M A L V IA S IN T H E LA N D P A T T E R N O F T H E E X P O S E D P A D S H A LL B E C O N N E C T E D T O A S Y S T E M G R O U N D P LA N E . F A ILU 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 . 14 SC633 © Semtech 2013 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. 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 15