SC630A 1MHz Fixed 3.3V Output Charge Pump Regulator POWER MANAGEMENT Features Description Input voltage range — 2.95V to 5.5V VOUT tolerance — 3.3V ±3% Continuous output current — 300mA max Three charge pump modes — 1x, 1.5x and 2x Output ripple voltage — 33mVPP , typical 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 Applications Mobile phones Tablets USB On-The-Go Multi-LED backlit LCDs Compact flash/CF+ products Digital video cameras DVI/HDMI ports Wi-Fi base stations Modems Set-top boxes The SC630A is a high-current voltage regulator using Semtech’s proprietary low-noise charge pump technology. The charge pump provides a low EMI solution compared to inductive boost regulators. 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 battery is greater than 3.3V. Unlike an LDO, drop-out is avoided when the battery is less than 3.3V. Instead, a charge pump is activated to provide voltage boost and the head-room needed for regulation. The SC630A’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. Hysteresis is provided to prevent chatter between charge pump modes. When active, the charge pump provides low-ripple operation at 1MHz. Typically the output ripple is 1% of the output voltage — 33mVpp at 215mA. A small 2.2µF capacitor is recommended for all four capacitors. The full rated output current is provided when 2.2µF is used for both bucket capacitors. At the output, a 2.2µF capacitor decouples the load and provides smoothing for mode transitions, while another 2.2µF is used to decouple the input. Typical Application Circuit CIN 2.2µF VBAT IN OUT VOUT = 3.3V @ 300mA COUT 2.2µF SC630A Chip enable EN C1+ C1C2+ GND C2- C1 2.2µF C2 2.2µF US Patent: 7,808,220 Rev. 1.1 © 2011 Semtech Corporation SC630A Pin Configuration GND Ordering Information 1 8 C2- TOP VIEW C1+ 2 7 C2+ C1- 3 6 OUT 5 EN Device Package SC630AULTRT(1)(2) MLPD-UT-8 2x2 SC630AEVB Evaluation Board Notes: (1) Available in tape and reel only. A reel contains 3,000 devices. (2) Lead-free package only. Device is WEEE and RoHS compliant and halogen free. T IN 4 MLPD-UT-8; 2x2, 8 LEAD θJA = 68°C/W Marking Information K0A yw yw = Datecode SC630A Absolute Maximum Ratings Recommended Operating Conditions IN, OUT (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +6.0 Ambient Temperature Range (°C). . . . . . . . . -40 < TA < +85 C1+, C2+ (V) . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.3 to (VOUT + 0.3) IN (V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.95 < VIN < 5.5 Pin Voltage - All Other Pins (V). . . . . . . . . . . -0.3 to (VIN + 0.3) OUT Short Circuit Duration. . . . . . . . . . . . . . . . . . Continuous ESD Protection Level(1) (kV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Thermal Information Thermal Resistance, Junction to Ambient(2) (°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) Tested according to JEDEC standard JESD22-A114-B. (2) 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. 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 = 2.95V to 5.5V Parameter Symbol Condition Min Typ Max Units Output Voltage VOUT VIN = 4.2V, IOUT = 1mA 3.2 3.3 3.4 V Output Voltage Ripple VPP IOUT = 215mA Continuous Load, 2.95V ≤ VIN ≤ 5.5V, 1x or 1.5x mode 33 mV 300 mA Shutdown Current ISD Shutdown (EN = GND), VIN = 3.6V 0.1 2 µA Total Quiescent Current IQ EN high, IOUT = 1mA 2.5 3.5 mA Charge Pump Frequency fPUMP VIN = 3.2V 1 MHz tSU (EN transitions from low to high), 3.2V ≤ VOUT ≤ 3.4V, No load 400 µs Line Regulation ΔVLINE IOUT = 1mA, 2.95V ≤ VIN ≤ 4.2V 21 mV Load Regulation ΔVLOAD VIN Fixed, 1mA ≤ IOUT ≤ 300mA 25 mV EN Input High Threshold VIH VIN = 5.5V EN Input Low Threshold VIL VIN = 2.7V 0.4 V EN Input High Current IIH VIN = 5.5V 2 µA Start-Up Time 1.6 V SC630A Electrical Characteristics (continued) Parameter EN Input Low Current Open-Loop Output Resistance Mode Transition Voltage (2) Symbol Condition IIL VIN = 5.5V Min Typ Max Units 2 µA 1x mode 0.3 Ω 1.5x mode, VIN = 3.08V 4.5 Ω 2x mode, VIN = 2.95V 2.6 Ω V TRANS 1X IOUT = 300mA 3.35 V V TRANS 1.5X IOUT = 300mA 3.08 V ISC VOUT = 0V, IOUT = IIN 300 600 980 mA 1x mode 0.6 1.2 2.0 A 1.5x and 2x modes 1.2 2.0 2.8 A ROUT Fault Protection Short-Circuit Current Input Current Limit Over Temperature (3) ILIMIT VOUT ≤ 2V, IOUT = IIN 700 mA TOTP Rising Threshold 165 °C THYS Hysteresis 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 is where a mode transition takes place in the charge pump with VIN falling. (3) Guaranteed by design — not tested in production SC630A Typical Characteristics Line Regulation Load Regulation VOUT = 3.3V, VIN = 3.6V -20 -15 TA=85°C -10 TA=25°C TA=-40°C -5 0 0 50 VOUT = 3.3V, IOUT = 1mA 20 100 150 200 Output Current (mA) 250 300 15 Output Voltage Variation — ΔVLINE (mV) Output Voltage Variation — ΔVLOAD (mV) -25 25°C 10 85°C 5 -40°C 0 PSRR — 1x Mode -5 -10 -15 -20 350 2.7 3.1 3.5 3.9 4.3 Input Voltage (V) VOUT = 3.3V VIN = 4.0V 80 70 60 20 50 0 100 150 200 Load Current (mA) 250 300 300mA 40 60 50 VOUT = 3.3V, CIN = COUT = C1 = C2 = 2.2µf (0603) 80 VIN = 3.8V 0 350 200mA 100mA 50mA 5.6 0 CIN = COUT = C1 = C2= 2.2µF (0603) 4.8 4.0 4.4 Input Voltage (V) 3.6 3.2 2.8 -30 -40 -40 Gain (dB) Gain (dB) -20 -30 -50 -60 VIN = 4.2V, VOUT = 3.3V, IOUT = 50mA CIN = COUT = C1 = C2= 2.2µF (0603) -10 -20 -50 -60 -70 -70 -80 -80 -90 -90 -100 10 5.2 PSRR — 1x Mode VIN = 3.2V, VOUT = 3.3V, IOUT = 50mA -10 10mA 1x mode PSRR — 1.5x Mode 0 5.5 1.5x and 2x mode VIN = 3.6V Ripple (mV p-p) Efficiency (%) 100 VIN = 3.4V 90 5.1 Output Ripple Efficiency versus Load Current 100 4.7 100 Frequency (Hz) 1000 10000 -100 10 100 Frequency (Hz) 1000 10000 SC630A Typical Characteristics (continued) Efficiency — 10mA 100 Efficiency — 50mA VOUT = 3.3V, IOUT = 10mA 100 90 Efficiency(%) Efficiency(%) 90 80 1x Mode 70 Mode Transition Hysteresis 60 50 VOUT = 3.3V, IOUT = 50mA 80 70 5.2 4.8 4.4 4.0 Input Voltage (V) 3.6 1x Mode 1.5x Mode 60 1.5x Mode 50 5.6 3.2 2.8 5.6 5.2 Efficiency — 100mA 100 Mode Transition Hysteresis 4.8 4.4 4.0 Input Voltage (V) 3.6 3.2 2.8 Efficiency — 200mA VOUT = 2.95V, IOUT = 100mA 100 90 VOUT = 3.3V, IOUT = 200mA 90 80 1x Mode Mode Transition Hysteresis 70 1.5x Mode 60 50 Efficiency(%) Efficiency(%) 1x Mode 80 Mode Transition Hysteresis 70 1.5x Mode 60 2x Mode 5.6 5.2 4.8 4.4 4.0 Input Voltage (V) 3.6 3.2 2.8 50 5.6 5.2 4.8 4.4 4.0 Input Voltage (V) 3.6 3.2 2.8 Efficiency — 300mA 100 VOUT = 3.3V, IOUT = 300mA 1x Mode 90 Efficiency(%) 80 1.5x Mode 70 Mode Transition Hysteresis 60 50 40 2x Mode 5.6 5.2 4.8 4.4 4.0 Input Voltage (V) 3.6 3.2 2.8 SC630A Typical Characteristics (continued) Ripple — 1.5x Mode Ripple — 1x Mode VIN = 3.6V, VOUT = 3.3V, IOUT = 215mA VIN = 3.2V, VOUT = 3.3V, IOUT = 215mA VIN -PP (100mV/div) VIN -PP (100mV/div) VOUT -PP (100mV/div) VOUT -PP (100mV/div) 215mA IOUT (200mA/div) 215mA IOUT (200mA/div) CIN=COUT=C1=C2=2.2µF (0603) 0mA 0mA CIN=COUT=C1=C2=2.2µF (0603) Time (1µs/div) Time (1µs/div) Startup (No Load) Ripple — 2x Mode VIN = 2.85V, VOUT = 3.3V, IOUT = 215mA VIN = 3.6V, IOUT = 0mA VEN (2V/div)– VIN -PP (100mV/div) 0V— VOUT -PP (100mV/div) VOUT (2V/div)–– 0V— 215mA IOUT (200mA/div) IOUT (200mA/div)– 0mA 0V— CIN=COUT=C1=C2=2.2µF (0603) CIN=COUT=C1=C2=2.2µF (0603) Time (200µs/div) Time (1µs/div) Quiescent Current Startup (215mA) VIN = 3.6V, IOUT = 215mA 2.5 VEN (2V/div)– VOUT = 3.3V, IOUT = 1mA 2 0V— 85°C 1.5 IQ(mA) VOUT (2V/div)–– -45°C 0V— 1 IOUT (200mA/div)– 0.5 0V— 25°C CIN=COUT=C1=C2=2.2µF (0603) Time (200µs/div) 0 5.6 5.2 4.8 4.4 VIN (V) 4 3.6 3.2 2.8 SC630A 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. SC630A Block Diagram IN 4 LDO 2 C1+ 1MHz 3 C17 C2+ EN 5 Logic Control Reference Voltage Generator CHARGE PUMP 8 C26 OUT 1 GND SC630A Applications Information General Description Temperature Derating The SC630A is a 3.3V output charge pump regulator designed to support up to 300mA (TA ≤ 85°C, 2.95V ≤ VIN ≤ 5.5V) of continuous current. It is used for powering Micro HDDs (Hard Disk Drives) and other 3.3V devices in portable handheld equipment including Compact Flash and CF+ products. The load current and battery voltage range of the application should be compared with the efficiency plots on page 6 to determine if 2x mode is required by the application. The data provided in the following derating curve for 2x mode is based on the peak power dissipation that could occur while in 2x mode. 1x and 1.5x modes do not require derating. Mode Transition Hysteresis Hysteresis is provided to prevent chatter between charge pump modes. The hysteresis between charge pump modes is shown in the efficiency plots of the Typical Characteristics section. For optimum transient performance, the input should be decoupled to prevent steps greater than the hysteresis voltage. Note that hysteresis is load dependent, and increases with the load current to prevent chatter between the charge pump modes. Thermal Resistance The SC630A package is thermally efficient when the circuit board layout connects the thermal pad through multiple vias to the ground plane. The thermal resistance 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 SC630A 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. 350 300 IOUT (mA) The SC630A has three operating modes — 1x, 1.5x, and 2x. The 1x mode is a linear series regulation mode with a low output resistance of only 300mW. 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. Derating for applications requiring 2x mode 250 200 150 100 35 45 55 65 75 85 Ambient Temperature (°C) 95 105 Maximum Continuous Output Protection Circuitry The SC630A 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). 10 SC630A Applications Information (continued) 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 that prevents the device from re-enabling until the junction temperature is reduced by 20°C. Table 1 — Recommended Capacitors Size Code mil(mm) Value μF CIN , COUT 0603(1608) 2.2 C1, C2 Capacitor Selection The SC630A is designed to use low-ESR ceramic capacitors for the input and output bypass capacitors as well as the charge pump bucket capacitors. The value of input, output and decoupling capacitors will vary with system requirements for ripple and output current. Performance as shown in the Typical Characteristic section is expected when using 2.2µF capacitors in the 0603(1608 metric) case size with X5R dielectric for CIN , COUT , C1 and C2 capacitors (refer to Table 1). Consider the DC voltage characteristic of the capacitor when choosing capacitors for an application. 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. The highest capacitance values in the smallest package sizes 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. Capacitor CIN , COUT 0402(1005) 2.2 C1, C2 CIN , COUT 0402(1005) 0.47 C1, C2 1.0 CIN , COUT 0.1 C1, C2 0402(1005) Notes This capacitor is required for the full rated output current. Typical output VPP < 100mV in all charge pump modes. This capacitor combination supports up to 200mA output current with typical output VPP < 100mV in all charge pump modes. This capacitor combination supports up to 100mA output current with typical output VPP < 100mV in all charge pump modes. This combination of capacitors support up to 100mA output current with typical output VPP < 100mV in all charge pump modes. The 0.1µF bucket capacitors will increase output resistance by 2.5Ω compared to 0.47µF and larger values. NOTE: Use only X5R type capacitors, with a 6.3V rating or higher 11 SC630A 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. SC630A GND C1 C1+ C2- GND C2 C2+ C1- OUT IN EN COUT CIN EN 12 SC630A Outline Drawing — MLPD-UT-8 2x2 B D A DIMENSIONS DIM E PIN 1 INDICATOR (LASER MARK) A SEATING PLANE aaa C A2 A1 C A A1 A2 b D D1 E E1 e L N aaa bbb INCHES MIN .020 .000 NOM (.006) MILLIMETERS MAX .024 .002 .007 .075 .061 .075 .026 .010 .012 .079 .083 .067 .071 .079 .083 .031 .035 .020 BSC .012 .014 .016 8 .003 .004 MIN 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 BSC 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 NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS THE TERMINALS. 13 SC630A Land Pattern — MLPD-UT-8 2x2 H R (C) DIMENSIONS K G Z Y P DIM INCHES MILLIMETERS 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 NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. 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. 14 SC630A © 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 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. 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