FAN5365

FAN5365 — 1A / 0.8A, 6MHz Digitally Programmable Regulator November 2010 FAN5365 1A / 0.8A, 6MHz Digitally Programmable Regulator Features High Efficiency (>88%) at 6MHz 800mA or 1A Output Current Regulation Maintained with VIN from 2.3V to 5.5V 6-Bit VOUT Programmable from 0.75 to 1.975V 6MHz Fixed-Frequency Operation (PWM Mode) Excellent Load and Line Transient Response Small Size, 470nH Inductor Solution ±2% DC Voltage Accuracy in PWM Mode 25ns Minimum On-Time High-Efficiency, Low-Ripple, Light-Load PFM Smooth Transition between PWM and PFM 40μA Operating PFM Quiescent Current I C™-Compatible Interface up to 3.4Mbps Pin-Selectable or I C™ Programmable Output Voltage 9-Bump, 1.27 x 1.29mm, 0.4mm Pitch WLCSP Package 2 2 Description The FAN5365 is a high-frequency, ultra-fast transient response, synchronous step-down, DC-DC converter optimized for low-power applications using small, low-cost inductors and capacitors. The FAN5365 supports up to 800mA or 1A load current. The FAN5365 is ideal for mobile phones and similar portable applications powered by a single-cell Lithium-Ion battery. 2 With an output voltage range adjustable via I C™ interface from 0.75V to 1.975V, it supports low-voltage DSPs and processors, core power supplies, and memory modules in smart phones, data cards, and hand-held computers. The FAN5365 operates at 6MHz (nominal) fixed switching frequency in PWM mode. During light-load conditions, the regulator includes a PFM mode to enhance light-load efficiency. The regulator transitions smoothly between PWM and PFM modes with no glitches on VOUT. In hardware shutdown, the current consumption is reduced to less than 200nA. The serial interface is compatible with fast / standard mode, 2 fast mode plus, and high-speed mode I C specifications, allowing transfers up to 3.4Mbps. This interface is used for dynamic voltage scaling with 12.5mV voltage steps, for reprogramming the mode of operation (PFM or forced PWM), or to disable/enable the output voltage. The chip's advanced protection features include short-circuit protection and current and temperature limits. During a sustained over-current event, the IC shuts down and restarts after a delay to reduce average power dissipation into a fault. During startup, the IC controls the output slew rate to minimize input current and output overshoot at the end of soft-start. The IC maintains a consistent soft-start ramp, regardless of output load during startup. The FAN5365 is available in a 1.27 x 1.29mm, 9-bump WLCSP package. Applications 3G, WiFi , WiMAX™, and WiBro Data Cards Netbooks , Ultra-Mobile PCs SmartReflex™-Compliant Power Supply Split Supply DSPs and μP Solutions OMAP™, XSCALE™ Handset Graphic Processors (NVIDIA , ATI) ® ® ® ® All trademarks are the property of their respective owners © 2008 Fairchild Semiconductor Corporation FAN5365 • Rev. 1.0.4 www.fairchildsemi.com FAN5365 — 1A / 0.8A, 6MHz Digitally Programmable Regulator Ordering Information Part Number (1) Option 00 02 03 06 Slave Address LSB A2 A1 1 1 0 0 Output Current mA 800 800 1000 1000 VOUT Programming Min. 0.7500 0.7500 0.7500 1.1875 Power-up Defaults VSEL0 1.05 0.95 1.00 1.80 Package WLCSP-09 WLCSP-09 WLCSP-09 WLCSP-09 A0 0 0 0 0 Max. 1.4375 1.4375 (3) (3) VSEL1 1.20 1.10 1.20 1.80 FAN5365UC00X FAN5365UC02X FAN5365UC03X FAN5355UC06X (2) (2) 0 1 0 0 1.5375 1.9750 Notes: 1. The “X” designator on the part number indicates tape and reel packaging. 2. Preliminary; not full production release at this time. Contact a Fairchild representative for information. 3. VOUT is limited to the maximum voltage for all VSEL codes greater than the maximum VOUT listed. Typical Application VIN Q1 VIN CIN EN VSEL SDA SCL PGND AGND VOUT SW VOUT L COUT MODULATOR Q2 Figure 1. Typical Application Table 1. Recommended External Components Component L (LOUT) COUT (5) Description 470nH Nominal 0603 (1.6x0.8x0.8), 10μF X5R 0402 (1x0.5x0.25), 4.7μF X5R Vendor Murata, TDK, FDK Various Taiyo-Yuden Parameter L (4) Min. 390 2.2 1.6 Typ. 470 80 10.0 4.7 Max. 600 15.0 Units nH mΩ μF μF DCR (Series R) C (6) CIN Notes: 4. Minimum L incorporates tolerance, temperature, and partial saturation effects (L decreases when increasing current). 5. A capacitor similar to CIN can be used for COUT. With 1.4V of bias, a 4.7μF 0402 capacitor minimum value is 2.5μF. The regulator is stable, but transient response degraded due to large signal effects. 6. Minimum C is a function of initial tolerance, maximum temperature, and the effective capacitance being reduced due to frequency, dielectric, and voltage bias effects. CIN is biased with a higher voltage which reduces its effective capacitance by a larger amount. © 2008 Fairchild Semiconductor Corporation FAN5365 • Rev. 1.0.4 www.fairchildsemi.com 2 FAN5365 — 1A / 0.8A, 6MHz Digitally Programmable Regulator Pin Configuration A1 A2 A3 A3 A2 A1 B1 B2 B3 B3 B2 B1 C1 C2 C3 C3 C2 C1 Bumps Facing Down Figure 2. WLCSP-09, 0.4mm Pitch Bumps Facing Up Pin Definitions Pin # A1 A2 A3 B1 B2 B3 C1 C2 C3 Name VSEL VIN SDA SW SCL EN VOUT PGND AGND Description Voltage Select. When HIGH, VOUT is set by VSEL1. When LOW, VOUT is set by VSEL0. This behavior 2 can be overridden through I C register settings. This pin should not be left floating. Input Voltage. Connect to input power source. The connection from this pin to CIN should be as short as possible. SDA. I C interface serial data. This pin should not be left floating. Switching Node. Connect to output inductor. SCL. I C interface serial clock. This pin should not be left floating. Enable. When this pin is HIGH, the circuit is enabled. When LOW, part enters shutdown mode and input current is minimized. This pin should not be left floating. Output Voltage Monitor. Tie this pin to the output voltage at COUT. This is a signal input pin to the control circuit and does not carry DC current. Power GND. Power return for gate drive and power transistors. Connect to AGND on PCB. The connection from this pin to the bottom of CIN should be as short as possible. Analog GND. This is the signal ground reference for the IC. All voltage levels are measured with respect to this pin. AGND should be connected to PGND at a single point. 2 2 © 2008 Fairchild Semiconductor Corporation FAN5365 • Rev. 1.0.4 www.fairchildsemi.com 3 FAN5365 — 1A / 0.8A, 6MHz Digitally Programmable Regulator Absolute Maximum Ratings 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, SW Pins VCC VOUT Other Pins ESD TJ TSTG TL Parameter Min. –0.3 –0.3 –0.3 Max. 6.5 2.5 VIN + 0.3 3 1 (7) Units V Electrostatic Discharge Protection Junction Temperature Storage Temperature Human Body Model, JESD22-A114 Charged Device Model, JESD22-C101 –40 –65 KV +150 +150 +260 °C °C °C Lead Soldering Temperature, 10 Seconds Note: 7. Lesser of 6.5V or VCC+0.3V. 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 VIN VCCIO TA TJ Parameter Supply Voltage SDA and SCL Voltage Swing Ambient Temperature Junction Temperature (8) Min. 2.3 1.2 –40 –40 Max. 5.5 2.0 +85 +125 Units V V °C °C Note: 2 8. The I C interface operates with tHD;DAT = 0 as long as the pull-up voltage for SDA and SCL is less than 2.5V. If voltage 2 swings greater than 2.5V are required (for example, if the I C bus is pulled up to VIN), the minimum tHD;DAT must be 2 increased to 80ns. Most I C masters change SDA near the midpoint between the falling and rising edges of SCL, which provides ample tHD;DAT. Dissipation Ratings(9) Package Wafer-Level Chip-Scale Package (WLCSP) RθJA (10) Power Rating at TA ≤ 25°C 900mW Derating Factor > TA = 25ºC 9mW/ºC 110ºC/W Notes: 9. Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable ambient temperature is PD = [TJ(max) - TA ] / θJA. 10. This thermal data is measured with a high-K board (four-layer board, according to the JESD51-7 JEDEC standard). © 2008 Fairchild Semiconductor Corporation FAN5365 • Rev. 1.0.4 www.fairchildsemi.com 4 FAN5365 — 1A / 0.8A, 6MHz Digitally Programmable Regulator Electrical Specifications Unless otherwise noted, over the recommended operating range for VIN and TA, EN = VSEL = SCL = SDA = 1.8V, and register VSEL0[6] bit = 1. Typical values are at VIN = 3.6V, TA = 25°C. Circuit and components according to Figure 1. Symbol Parameter Power Supplies IQ Quiescent Current Conditions IO = 0mA, PFM Mode, 2.3V