SC632 Fixed 5.0V Output Charge Pump Regulator POWER MANAGEMENT Features Description Input voltage range — 2.9V to 5.5V VOUT tolerance — 5.0V ±3% Continuous output current — 275mA Peak output current — 500mA Three charge pump modes — 1x, 1.5x and 2x Output ripple ≤ 30mVPP 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 Applications The SC632 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 5.0V. Unlike an LDO, dropout is avoided when the input is less than 5.0V. 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. The SC632’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 SC632 is capable of delivering 275mA continuous current, with peak current to 500mA. 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 CIN 22µF VBAT IN OUT VOUT = 5.0V @ 275mA COUT 22µF SC632 Chip enable EN GND C1+ C1- C1 2.2µF C2+ C2- C2 2.2µF US Patent: 7,808,220 Revision 6.0 © 2011 Semtech Corporation SC632 Pin Configuration GND Ordering Information 1 8 C2- TOP VIEW C1+ 2 7 C2+ C1- 3 6 OUT 5 4 MLPD-UT-8; 2x2, 8 LEAD θJA = 68°C/W Package SC632ULTRT(1)(2) MLPD-UT-8 2x2 SC632EVB 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 Device T IN Device EN Features SC630A 1MHz, 3.3V, smaller CIN and COUT SC632A 1MHz, 5.0V, smaller CIN and COUT SC630 200kHz, 3,3V Marking Information 632 yw yw = Datecode SC632 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 4.85 5.0 5.15 V Output Voltage Ripple VPP IOUT ≤ 400mA Maximum Output Current IOUT 30 mV Peak Load - thermally limited(1), TJ <150°C, 3.3V ≤ VIN ≤ 5.5V 500 mA Continuous Load, TA ≤ 55°C, 3.15V ≤ VIN ≤ 4.2V 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 1.5 2.5 mA Charge Pump Frequency fPUMP VIN = 3.2V 200 260 kHz tSU (EN transitions from low to high), 4.85V ≤ VOUT ≤ 5.15V, 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 Start-Up Time 140 400 µs SC632 Electrical Characteristics (continued) Parameter Symbol Condition Min EN Input High Threshold VIH VIN = 5.5V 1.6 EN Input Low Threshold VIL VIN = 2.7V 0.4 V EN Input High Current IIH VIN = 5.5V 2 µA EN Input Low Current IIL VIN = 5.5V 2 µA Open-Loop Output Resistance Mode Transition Voltage (2) Typ Max Units V 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 5.05 V V TRANS 1.5X IOUT = 200mA 3.71 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. SC632 Typical Characteristics Line Regulation Load Regulation VOUT = 5V, VIN = 4.2V TA=25°C 20 TA=85°C 15 10 TA=-40°C 5 0 0 90 VOUT = 5V, IOUT = 1mA 25 Output Voltage Variation — ΔV LINE (mV) Output Voltage Variation — ΔVLOAD (mV) 25 180 270 Output Current (mA) 360 20 25°C 10 3.6V, 0mV 0 -5 -10 2.7 PSRR versus Frequency — 1.5x Mode -40 Gain (dB) -30 -40 -50 -60 -80 -80 -90 -90 -100 -100 1000 5.1 5.5 VIN = 4.2V, VOUT = 5V, IOUT = 50mA CIN=COUT=22µF (0805) C1=C2=2.2µF (0603) -60 -70 Frequency (Hz) 4.7 -50 -70 100 3.9 4.3 Input Voltage (V) -20 -30 10 3.5 -10 C1=C2=2.2µF (0603) -20 Gain (dB) 0 CIN=COUT=22µF (0805) -10 3.1 PSRR versus Frequency — 1.5x Mode VIN = 3.6V, VOUT = 5V, IOUT = 50mA 0 -40°C 5 -15 450 85°C 15 10000 10 100 Frequency (Hz) 1000 10000 PSRR versus Frequency — 2x Mode 0 VIN = 2.9V, VOUT = 5V, IOUT = 50mA CIN=COUT=22µF (0805) -10 C1=C2=2.2µF (0603) -20 Gain (dB) -30 -40 -50 -60 -70 -80 -90 -100 10 100 Frequency (Hz) 1000 10000 SC632 Typical Characteristics (continued) Efficiency — 50mA Efficiency — 10mA 100 VOUT = 5V, IOUT = 10mA 100 90 90 1.5x Mode 80 1.5x Mode Efficiency(%) Efficiency(%) VOUT = 5V, IOUT = 50mA Mode Transition Hysteresis 70 2x Mode 80 Mode Transition Hysteresis 70 60 60 50 4.2 3.9 3.6 3.3 Input Voltage (V) 3.0 50 4.2 2.7 3.3 3.6 Input Voltage (V) 3.9 3.0 2.7 3.0 2.7 3.0 2.7 Efficiency — 200mA Efficiency — 100mA 100 2x Mode VOUT = 5V, IOUT = 100mA 100 VOUT = 5V, IOUT = 200mA 1.5x Mode 90 90 80 Efficiency(%) Efficiency(%) 1.5x Mode Mode Transition Hysteresis 70 2x Mode 60 Mode Transition Hysteresis 80 70 60 50 4.2 3.9 3.3 3.6 3.0 50 4.2 2.7 Input Voltage (V) 100 VOUT = 5V, IOUT = 400mA 90 1.5x Mode 1.5x Mode 80 2x Mode 70 80 2x Mode 70 60 60 50 4.2 3.3 Input Voltage (V) Efficiency — 400mA VOUT = 5V, IOUT = 300mA Efficiency(%) Efficiency(%) 90 3.6 3.9 Efficiency — 300mA 100 2x Mode 3.9 3.6 3.3 Input Voltage (V) 3.0 2.7 50 4.2 3.9 3.6 3.3 Input Voltage (V) SC632 Typical Characteristics (continued) Ripple — 1.5x Mode Ripple — 1x Mode VIN = 4.2V, VOUT= 5.0V, IOUT = 400mA VIN = 5.2V, VOUT = 5.0V, IOUT = 400mA VIN -PP (20mV/div) VIN -PP (100mV/div) VOUT -PP (20mV/div) VOUT -PP (100mV/div) IOUT (200mA/div) 400mA 400mA IOUT (200mA/div) CIN=COUT=22µF (0805) CIN=COUT=22µF (0805) C1=C2=2.2µF (0603) 0mA 0mA C1=C2=2.2µF (0603) Time (10µs/div) Time (10µs/div) Startup (No Load) Ripple — 2x Mode VIN = 3.2V, VOUT = 5.0V, IOUT = 400mA VIN = 3.6V, IOUT = 0mA VIN -PP (50mV/div) VEN (2V/div)– 0V— VOUT -PP (50mV/div) IOUT (200mA/div) 400mA VOUT (2V/div)– CIN=COUT=22µF (0805) 0V— CIN=COUT=22µF (0805) C1=C2=2.2µF (0603) 0mA C1=C2=2.2µF (0603) 0V— IOUT (200mA/div) Time (200µs/div) Time (10µs/div) Quiescent Current Startup (400mA) VOUT = 5V, IOUT = 1mA VIN = 3.6V, IOUT = 400mA 2.5 2.0 VEN (2V/div)– 85C 25C IQ (mA) 0V — 1.5 -45C VOUT (2V/div)– 0V— 0V— IOUT (200mA/div)– 1.0 CIN=COUT=22µF (0805) C1=C2=2.2µF (0603) Time (200µs/div) 0.5 4.20 3.94 3.68 3.42 3.16 2.90 VIN (V) SC632 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. SC632 Block Diagram IN 4 LDO 2 C1+ 200kHz 3 C17 C2+ EN 5 Logic Control Reference Voltage Generator CHARGE PUMP 8 C26 OUT 1 GND SC632 Applications Information General Description Temperature Derating The SC632 is a 5.0V output charge pump regulator designed to support up to 400mA (TA ≤ 55°C, 3.15V ≤ 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 VIN supply range and ambient temperature range of the application should be compared with the following derating curve to determine the maximum safe continuous load current. The DC operating points beneath each curve are in the safe operating temperature range of the MLP package. 450 400 300 Thermal Resistance The SC632 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 SC632 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. Derating for VIN < 5.5V 250 200 150 35 45 55 75 65 Ambient Temp (°C) 85 95 105 Maximum Continuous Output 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 optimum transient performance, when the input voltage reaches the mode transition thresholds. Derating for VIN < 4.2V 350 IOUT (mA) The SC632 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. Protection Circuitry The SC632 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. 10 SC632 Applications Information (continued) 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). 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. 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 Capacitor Selection The SC632 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. 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 SC632 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. SC632 C2- GND C1 C1+ GND C2 C2+ C1- OUT IN EN COUT CIN EN 12 SC632 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 SC632 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 SC632 © 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. 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