FAN48610 2.5 MHz, Fixed-Output Synchronous TinyBoost® Regulator Features Description The FAN48610 is a low-power boost regulator designed to provide a minimum voltage-regulated rail from a standard single-cell Li-Ion battery and advanced battery chemistries. Even below the minimum system battery voltage, the device maintains the output voltage regulation for a minimum output load current of 1.0 A. The combination of built-in power transistors, synchronous rectification, and low supply current suit the FAN48610 for battery-powered applications. Output Voltages Range: 3.0 V to 5.0 V IOUT ≥ 1 A at VOUT =5.0 V, VIN ≥ 2.5 V IOUT ≥ 1.5 A at VOUT =5.0 V, VIN ≥ 3.0 V Up to 94% Efficient Automatic Pass-Through Operation when VIN > VOUT Internal Synchronous Rectification The FAN48610 is available in a 9-bump, 0.4 mm pitch, Wafer-Level Chip-Scale Package (WLCSP). Soft-Start with True Load Disconnect Short-Circuit Protection 9-Bump, 1.215 mm x 1.215 mm, 0.4 mm Pitch WLCSP Three External Components: 2016 0.47 µH Inductor, 0603 Case Size Input / Output Capacitors Total Application Board Solution Size: < 11 mm 2 Battery + L1 Input Voltage Range: 2.35 V to 5.50 V 0.47µH VIN VOUT CIN COUT 10µF SW 22µF FAN48610 SYSTEM LOAD PGND Applications EN AGND Class-D Audio Amplifier and USB OTG Supply Boost for Low-Voltage Li-Ion Batteries Smart Phones, Tablets, Portable Devices Figure 1. Typical Application Ordering Information Part Number FAN48610UC50X (2) FAN48610BUC50X Packing (1) VOUT Operating Temp Package 5.0 V -40°C to 85°C WLCSP, 0.4 mm Pitch Tape and Reel 5.0 V -40°C to 85°C WLCSP, 0.4 mm Pitch Tape and Reel Notes: 1. Please refer to Application Note AN-6054 — Tape and Reel Specifications on www.fairchildsemi.com. 2. The FAN48610BUC50X includes backside lamination. © 2013 Fairchild Semiconductor Corporation FAN48610 • Rev. 1.0.0 www.fairchildsemi.com FAN48610 — 2.5 MHz, Fixed-Output Synchronous TinyBoost® Regulator September 2013 SW Q2A L1 Q2B VOUT VIN Q1 Q2 COUT CIN Synchronous Rectifier Control PGND MODULATOR LOGIC AND CONTROL EN AGND Figure 2. IC Block Diagram Table 1. Recommended Components Component Description Vendor Parameter Typ. Unit 0.47 µH 0.47 µH, 30%, 2016 Toko: DFE201612C DFR201612C Cyntec: PIFE20161B L L1 DCR (Series R) 40 mΩ CIN 10 µF, 10%, 6.3 V, X5R, 0603 Murata: GRM188R60J106K TDK: C1608X5R0J106K C 10 µF COUT 22 µF, 20%, 6.3 V, X5R, 0603 TDK: C1608X5R0J226M C 22 µF Pin Configuration VOUT A2 A1 SW B1 A3 A3 A2 A1 B3 B2 B1 C3 C2 C1 EN B2 PGND C1 VIN C2 B3 AGND C3 Figure 3. Top View Figure 4. Bottom View Pin Definitions Pin # Name Description A1, A2 VOUT A3 VIN Input Voltage. Connect to Li-Ion battery input power source and the bias supply for the gate drivers. B1, B2 SW Switching Node. Connect to inductor. B3 EN Output Voltage. This pin is the output voltage terminal; connect directly to COUT. Enable. When this pin is HIGH, the circuit is enabled. C1, C2 PGND Power Ground. This is the power return for the IC. COUT capacitor should be returned with the shortest path possible to these pins. C3 AGND Analog Ground. This is the signal ground reference for the IC. All voltage levels are measured with respect to this pin – connect to PGND at a single point. © 2013 Fairchild Semiconductor Corporation FAN48610 • Rev. 1.0.0 • www.fairchildsemi.com 2 FAN48610 — 2.5 MHz , Fixed-Output Synchronous TinyBoost® Regulator Block Diagrams Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. Symbol VIN VOUT SW Parameter Min. Max. Unit -0.3 6.0 V 6.0 V DC -0.3 6.0 Transient: 10 ns, 3 MHz -1.0 8.0 Voltage on VIN Pin Voltage on VOUT Pin SW Node Voltage on Other Pins ESD -0.3 Electrostatic Discharge Protection Level Human Body Model per JESD22-A114 5 Charged Device Model per JESD22-C101 2 TJ Junction Temperature -40 TSTG Storage Temperature -65 TL 6.0 (3) V kV +150 Lead Soldering Temperature, 10 Seconds V °C +150 °C +260 °C Note: 3. Lesser of 6.0 V or VIN + 0.3 V. Recommended Operating Conditions The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to absolute maximum ratings. Symbol Parameter VIN Supply Voltage IOUT Maximum Output Current Min. Max. 2.5 4.5 1000 Unit V mA TA Ambient Temperature -40 +85 °C TJ Junction Temperature -40 +125 °C Thermal Properties Junction-to-ambient thermal resistance is a function of application and board layout. This data is measured with four-layer 2s2p boards with vias in accordance to JEDEC standard JESD51. Special attention must be paid not to exceed junction temperature, TJ(max), at a given ambient temperature, TA. Symbol ϴJA Parameter Junction-to-Ambient Thermal Resistance © 2013 Fairchild Semiconductor Corporation FAN48610 • Rev. 1.0.0 • Typical Unit 50 °C/W www.fairchildsemi.com 3 FAN48610 — 2.5 MHz , Fixed-Output Synchronous TinyBoost® Regulator Absolute Maximum Ratings Recommended operating conditions, unless otherwise noted, circuit per Figure 1, VOUT= 3.0 V to 5.0 V, VIN = 2.5 V to 4.5 V, TA = -40˚C to 85˚C. Typical values are given VIN = 3.6 V and TA = 25˚C. Symbol Parameter Conditions Min. Typ. Max. Units Power Supply IQ VIN Quiescent Current VUVLO Under-Voltage Lockout VIN=3.6 V, IOUT=0, EN= VIN 85 125 Shutdown: EN=0, VIN=3.6 V 3 10 2.2 2.3 VIN Rising VUVLO_HYS Under-Voltage Lockout Hysteresis 150 µA V mV Inputs VIH Enable HIGH Voltage VIL Enable LOW Voltage IPD RLOW 1.05 Current Sink Pull-Down EN Pin, Logic HIGH Low-State Active Pull-Down EN Pin, Logic LOW V 0.4 V 400 kΩ 100 200 300 nA Outputs VREG (4) Output Voltage Accuracy DC Referred to VOUT ILK_OUT VIN -to-VOUT Leakage Current VOUT=0, EN=0, VIN=4.2 V ILK VOUT-to-VIN Reverse Leakage Current VTRSP Output Voltage Accuracy Transient -2 VOUT=5.0 V, EN=0, VIN=2.5V (5) Referred to VOUT, 50-500 mA Load Step -5 2.0 4 % 1 µA 3.5 µA 5 % 3.0 MHz Timing fSW Switching Frequency VIN=3.6 V, VOUT=5.0 V, Load=1000 mA tSS Soft-Start EN HIGH to Regulation 50 Ω Load, VOUT = 5.0 V tRST FAULT Restart Timer 2.5 600 µs 20 ms Power Stage RDS(ON)N N-Channel Boost Switch RDS(ON) VIN=3.6 V, VOUT=5.0 V 80 130 mΩ RDS(ON)P P-Channel Sync. Rectifier RDS(ON) VIN=3.6 V, VOUT=5.0 V 65 115 mΩ Boost Valley Current Limit VOUT=5.0 V 3.0 Boost Soft-Start Valley Current Limit VIN<VOUT < VOUT_TARGET, SS Mode 1.7 A OCP Comparator Threshold VIN=5.0 V, VIN-VOUT 300 mV VMIN_1.0A Minimum VIN for 1000 mA Load VOUT=5.0 V 2.5 V VMIN_1.5A Minimum VIN for 1500 mA Load VOUT=5.0 V 3.0 V IV_LIM IV_LIM_SS VOCP A T150T Over-Temperature Protection (OTP) 150 ˚C T150H OTP Hysteresis 20 ˚C Notes: 4. DC ILOAD from 0 to 1 A. VOUT measured from mid-point of output voltage ripple. Effective capacitance of COUT > 3 µF. 5. Guaranteed by design and characterization; not tested in production. © 2013 Fairchild Semiconductor Corporation FAN48610 • Rev. 1.0.0 • www.fairchildsemi.com 4 FAN48610 — 2.5 MHz , Fixed-Output Synchronous TinyBoost® Regulator Electrical Specifications 100% 100% 96% 96% Efficiency Efficiency Unless otherwise specified; VIN = 3.6 V, VOUT = 5.0 V, TA = 25°C, and circuit and components according to Figure 1. 92% 88% 92% 88% 2.6 VIN 3.0 VIN 84% - 40C 84% +25C 3.3 VIN +85C 4.2 VIN 80% 80% 1 10 100 10 1 1000 1000 Figure 6. Efficiency vs. Load Current and Temperature, VIN=3.0 V, VOUT=3.5 V Figure 5. Efficiency vs. Load Current and Input Voltage, VOUT=3.5 V 96% 96% 92% 92% Efficiency Efficiency 100 Load Current (mA) Load Current (mA) 88% 84% 88% 84% 2.6 VIN 80% - 40C 80% 3.0 VIN +25C 3.6 VIN 4.2 VIN +85C 76% 76% 1 10 100 1000 1 10 Load Current (mA) 1000 Load Current (mA) Figure 7. Efficiency vs. Load Current and Input Voltage Figure 8. Efficiency vs. Load Current and Temperature 100% 98% 96% 94% Efficiency Efficiency 100 92% 88% 5.0 VOUT 84% 90% 86% 5.0 VOUT 82% 3.5 VOUT 3.5 VOUT 80% 78% 2.0 2.5 3.0 3.5 4.0 4.5 2.0 Input Voltage (V) 2.5 3.0 3.5 4.0 4.5 Input Voltage (V) Figure 9. Efficiency vs. Input Voltage and Output Voltage, Figure 10. Efficiency vs. Input Voltage and Output Voltage, 200 mA Load 1000 mA Load © 2013 Fairchild Semiconductor Corporation FAN48610 • Rev. 1.0.0 • www.fairchildsemi.com 5 FAN48610 — 2.5 MHz , Fixed-Output Synchronous TinyBoost® Regulator Typical Characteristics Unless otherwise specified; VIN = 3.6 V, VOUT = 5.0 V, TA = 25°C, and circuit and components according to Figure 1. 2 3 Output Regulation (%) Output Regulation (%) 2 1 0 2.6 VIN -1 1 0 -1 3.0 VIN - 40C 3.6 VIN +25C 4.2 VIN +85C -2 -2 0 250 500 750 0 1000 250 750 Figure 12. Output Regulation vs. Load Current and Temperature (Normalized to 3.6 VIN, 500 mA Load, TA=25°C) Figure 11. Output Regulation vs. Load Current and Input Voltage (Normalized to 3.6 VIN, 500 mA Load) 120 100 100 Input Current (µA) 120 80 60 40 80 60 40 - 40C Auto - 40C Auto 20 20 +25C Auto +25C Auto +85C Auto +85C Auto 0 0 2.0 2.5 3.0 3.5 4.0 4.5 2.0 2.5 3.0 Input Voltage (V) 3.5 4.0 4.5 Input Voltage (V) Figure 13. Quiescent Current vs. Input Voltage, Temperature, VOUT=5.0 V Figure 14. Quiescent Current vs. Input Voltage, Temperature, VOUT=3.5 V 60 3,000 50 2,500 Switching Frequency (KHz) Output Ripple (mVpp) 1000 Load Current (mA) Load Current (mA) Input Current (µA) 500 40 30 20 2.6 VIN 3.0 VIN 10 3.6 VIN 2,000 1,500 1,000 2.6 VIN 3.0 VIN 500 3.6 VIN 4.2 VIN 4.2 VIN 0 0 0 250 500 750 1000 0 Load Current (mA) 500 750 1000 Load Current (mA) Figure 15. Output Ripple vs. Load Current and Input Voltage © 2013 Fairchild Semiconductor Corporation FAN48610 • Rev. 1.0.0 • 250 Figure 16. Frequency vs. Load Current and Input Voltage www.fairchildsemi.com 6 FAN48610 — 2.5 MHz , Fixed-Output Synchronous TinyBoost® Regulator Typical Characteristics Unless otherwise specified; VIN = 3.6 V, VOUT = 5.0 V, TA = 25°C, and circuit and components according to Figure 1. Figure 17. Startup, 50 Ω Load Figure 18. Startup, 50 Ω Load, VIN =2.6 V, VOUT =3.5 V Figure 19. Overload Protection Figure 20. Load Transient, 100-500 mA, 100 ns Edge Figure 21. Load Transient, 500-1000 mA, 100 ns Edge Figure 22. Simultaneous Line / Load Transient, 3.3-3.9 VIN , 10 µs Edge, 500-1000 mA Load, 100 ns Edge © 2013 Fairchild Semiconductor Corporation FAN48610 • Rev. 1.0.0 • www.fairchildsemi.com 7 FAN48610 — 2.5 MHz , Fixed-Output Synchronous TinyBoost® Regulator Typical Characteristics Unless otherwise specified; VIN = 3.6 V, VOUT = 5.0 V, TA = 25°C, and circuit and components according to Figure 1. Figure 23. Load Transient, 100-500 mA, 100 ns Edge, VIN =3 V, VOUT =3.5 V Figure 24. Load Transient, 500-1000 mA, 100 ns Edge, VIN =3 V, VOUT =3.5 V Figure 25. Line Transient, 3.0-3.6 VIN , 10 µs Edge, 500 mA Load, VOUT =3.5 V Figure 26. Line Transient, 3.3-3.9 VIN , 10 µs Edge, 500 mA Load, VOUT =5.0 V Maximum Output Current (A) 2.60 2.20 1.80 1.40 1.00 +25C +85C 0.60 2.5 3.0 3.5 4.0 4.5 Input Voltage (V) Figure 27. Pass-Through Entry / Exit, 3.2-3.8 VIN , 1 ms Ramp, 500 mA Load, VOUT =3.5 V © 2013 Fairchild Semiconductor Corporation FAN48610 • Rev. 1.0.0 • Figure 28. Typical Maximum Output Current vs. Input Voltage www.fairchildsemi.com 8 FAN48610 — 2.5 MHz , Fixed-Output Synchronous TinyBoost® Regulator Typical Characteristics FAN48610 is a synchronous boost regulator, typically operating at 2.5 MHz in Continuous Conduction Mode (CCM), which occurs at moderate to heavy load current and low VIN voltages. The regulator’s Pass-Through Mode automatically activates when VIN is above the boost regulator’s set point. Table 2. If VOUT reaches VIN-300 mV during LIN1 Mode, the SS Mode is initiated. Otherwise, LIN1 times out after 512 µs and LIN2 Mode is entered. In LIN2 Mode, the current source is incremented to 1.6 A. If VOUT fails to reach VIN-300 mV after 1024 µs, a fault condition is declared and the device waits 20 ms to attempt an automatic restart. Operating Modes Mode Description Invoked When: LIN Linear Startup VIN > VOUT SS Boost Soft-Start VIN < VOUT < VOUT(TARGET) BST Boost Operating Mode VOUT= VOUT(TARGET) PT Pass-Through Mode VIN > VOUT(TARGET) Soft-Start (SS) Mode Upon the successful completion of LIN Mode (VOUT>VIN300 mV), the regulator begins switching with boost pulses current limited to 50% of nominal level. During SS Mode, if VOUT fails to reach regulation during the SS ramp sequence for more than 64 µs, a fault is declared. If large COUT is used, the reference is automatically stepped slower to avoid excessive input current draw. Boost Mode Regulation Boost (BST) Mode The FAN48610 uses a current-mode modulator to achieve excellent transient response and smooth transitions between CCM and DCM operation. During CCM operation, the device maintains a switching frequency of about 2.5 MHz. In lightload operation (DCM), frequency is naturally reduced to maintain high efficiency. This is a normal operating mode of the regulator. Pass-Through (PT) Mode In normal operation, the device automatically transitions from Boost Mode to Pass-Through Mode if VIN goes above the target VOUT. In Pass-Through Mode, the device fully enhances Q2 to provide a very low impedance path from VIN to VOUT. Entry to the Pass-Through Mode is triggered by condition where VIN > VOUT and no switching has occurred during the past 5 µs. To soften the entry into Pass-Through Mode, Q2 is driven as a linear current source for the first 5 µs. Pass-Through Mode exit is triggered when VOUT reaches the target VOUT voltage. During Automatic PassThrough Mode, the device is short-circuit protected by a voltage comparator tracking the voltage drop from VIN to VOUT; if the drop exceeds 300 mV, a fault is declared. Shutdown and Startup When EN is LOW, all bias circuits are off and the regulator is in Shutdown Mode. During shutdown, current flow is prevented from VIN to VOUT, as well as reverse flow from VOUT to VIN. It is recommended to keep load current draw below 500 mA until the devices successfully executes startup. The following table describes the startup sequence. Table 3. Boost Startup Sequence Start Mode Entry LIN1 VIN > VUVLO, EN=1 LIN2 LIN1 Exit Exit VOUT > VIN300 mV SS TIMEOUT LIN2 VOUT > VIN300 mV SS TIMEOUT FAULT VOUT=VOUT(TARG SS LIN1 or LIN2 Exit ET) OVERLOAD TIMEOUT Fault State End Timeout Mode (µs) The regulator enters Fault State under any of the following conditions: 512 1024 BST FAULT VOUT fails to achieve the voltage required to advance from LIN Mode to SS Mode. VOUT fails to achieve the voltage required to advance from SS Mode to BST Mode. Boost current limit triggers for 2 ms during BST Mode. VIN – VOUT > 300 mV; this fault can occur only after successful completion of the soft-start sequence. VIN < VUVLO. Once a fault is triggered, the regulator stops switching and presents a high-impedance path between VIN and VOUT. After waiting 20 ms, an automatic restart is attempted. 64 LIN Mode Over-Temperature When EN is HIGH and VIN > VUVLO, the regulator first attempts to bring VOUT within 300 mV of VIN by using the internal fixed-current source from VIN (Q2). The current is limited to the LIN1 set point. The regulator shuts down if the die temperature exceeds 150°C. Restart occurs when the IC has cooled by approximately 20°C. © 2013 Fairchild Semiconductor Corporation FAN48610 • Rev. 1.0.0 • www.fairchildsemi.com 9 FAN48610 — 2.5 MHz , Fixed-Output Synchronous TinyBoost® Regulator Circuit Description Output Capacitance (COUT) Output Voltage Ripple (6) The effective capacitance (CEFF ) of small, high-value ceramic capacitors decreases as their bias voltage increases, as illustrated in the graph below: Output voltage ripple is inversely proportional to COUT. During tON, when the boost switch is on, all load current is supplied by COUT. 25 VRIPPLE ( P −P ) = tON • Capacitance (µF) 20 I LOAD COUT EQ. 1 and V tON = t SW • D = t SW • 1 − IN VOUT therefore: 15 10 V VRIPPLE ( P − P ) = tSW • 1 − IN VOUT 5 EQ. 2 ILOAD • COUT EQ. 3 0 0 2 1 3 4 5 6 t SW = DC Bias Voltage (V) Figure 29. CEFF for 22 µF, 0603, X5R, 6.3 V-Rated Capacitor (TDK C1608X5R0J226M) Minimum CEFF Required for Stability Operating Conditions VOUT (V) VIN (V) ILOAD (mA) CEFF(MIN) (µF) 5.0 2.5 to 4.5 0 to 1000 3.0 EQ. 4 The maximum VRIPPLE occurs when VIN is minimum and ILOAD is maximum. For better ripple performance, more output capacitance can be added. FAN48610 is guaranteed for stable operation with the minimum value of CEFF (CEFF(MIN)) outlined in Table 4. Table 4. 1 fSW Layout Recommendations Note: 6. CEFF varies by manufacturer, capacitor material, and case size. The layout recommendations below highlight various topcopper pours by using different colors. To minimize spikes at VOUT, COUT must be placed as close as possible to PGND and VOUT, as shown below. For thermal reasons, it is suggested to maximize the pour area for all planes other than SW. Especially the ground pour should be set to fill all available PCB surface area and tied to internal layers with a cluster of thermal vias. Inductor Selection Recommended nominal inductance value is 0.47 µH. The FAN48610 employs valley-current limiting, so peak inductor current can reach 3.8 A for a short duration during overload conditions. Saturation effects cause the inductor current ripple to become higher under high loading, as only the valley of the inductor current ripple is controlled. Startup Input current limiting is in effect during soft-start, which limits the current available to charge COUT and any additional capacitance on the VOUT line. If the output fails to achieve regulation within the limits described in the Soft-Start section above, a fault occurs, causing the circuit to shut down. It waits about 20 ms before attempting a restart. If the total combined output capacitance is very high, the circuit may not start on the first attempt, but eventually achieves regulation if no load is present. If a high current load and high capacitance are both present during soft-start, the circuit may fail to achieve regulation and continually attempt soft-start, only to have the output capacitance discharged by the load when in Fault State. © 2013 Fairchild Semiconductor Corporation FAN48610 • Rev. 1.0.0 • Figure 30. Layout Recommendation www.fairchildsemi.com 10 FAN48610 — 2.5 MHz , Fixed-Output Synchronous TinyBoost® Regulator Application Information FAN48610 — 2.5 MHz , Fixed-Output Synchronous TinyBoost® Regulator Physical Dimensions Figure 31. 9-Bump, 0.4 mm Pitch, WLCSP Package Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/dwg/UC/UC009Ak.pdf Product-Specific Dimensions Product D E X Y FAN48610UC50X 1.215 ±0.030 mm 1.215 ±0.030 mm 0.02075 mm 0.02075 mm FAN48610BUC50X 1.215 ±0.030 mm 1.215 ±0.030 mm 0.02075 mm 0.02075 mm © 2013 Fairchild Semiconductor Corporation FAN48610 • Rev. 1.0.0 • www.fairchildsemi.com 11 FAN48610 — 2.5 MHz , Fixed-Output Synchronous TinyBoost® Regulator © 2013 Fairchild Semiconductor Corporation FAN48610 • Rev. 1.0.0 • www.fairchildsemi.com 12 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Fairchild Semiconductor: FAN48610UC50X FAN48610BUC50X