FAN53701, FAN53702, FAN53703 300 mA / 600 mA / 1 A Synchronous Buck Regulator Description www.onsemi.com The FAN5370X is a Super Low Iq, stepdown switching voltage regulator, that delivers a fixed output from an input voltage supply of 2.3 V to 5.5 V. Using a proprietary architecture with synchronous rectification, the FAN5370X is capable of delivering a peak efficiency of 93%, while maintaining efficiency over 90% at load currents as low as 1 mA. WLCSP6 The regulator operates with 0402 and 0603 input and output CASE 567UH capacitors, respectively, which reduces the total solution size to 2 5.5 mm . At moderate and light load, Pulse Frequency Modulation (PFM) is used to operate the device with a low quiescent current. Even MARKING DIAGRAM with such a low quiescent current, the part exhibits excellent transient response during load swings. In Shutdown Mode, the supply current 12KK drops to 100 nA, reducing power consumption. The Mode pin allows XYZ the part to be in a Super Low IQ (SLIQ) mode with a typical quiescent current of 2 A. The FAN5370X is available in 6bump, 0.4 mm pitch, WaferLevel 12 = Alphanumeric Device Marking ChipScale Package (WLCSP). KK = Lot Run Code X = Alphabetical Year Code Features Y = 2weeks Date Code 2 A Typical Quiescent Current Z = Assembly Plant Code 2 5.5 mm Total Solution Size 300 mA / 600 mA / 1 A Output Current Capability 0.6 V to 3.3 V Fixed Output Voltage SW L1 VIN VOUT 2.3 V to 5.5 V Input Voltage Range 1.0H C IN BestinClass Load Transient Response C OUT 2.2F 22F BestinClass Efficiency with Sub 1 mA Output Currents FAN5370X Internal SoftStart Limits Battery Current Below 150 mA to Avoid MODE FB Brownout Scenarios Protection Faults (UVLO, OCP and OTP) EN GND Thermal Shutdown and Overload Protection 6Bump WLCSP, 0.4 mm Pitch Figure 1. Typical Application These Devices are PbFree, Halogen Free/BFR Free and are RoHS Compliant Applications ORDERING INFORMATION See detailed ordering and shipping information on page 2 of Wearables this data sheet. Smart Watch Health Monitoring Sensor Drive Energy Harvesting Utility and Safety Modules RF Modules Semiconductor Components Industries, LLC, 2017 1 Publication Order Number: January, 2017 Rev. 1 FAN53701/DFAN53701, FAN53702, FAN53703 Table 1. ORDERING INFORMATION Output Voltage Max. Output Temperature (Note 1) Current (Note 1) Range Part Number Package Packing Method Device Marking FAN53703UC48X 3.0 V 1.0 A 40 to 85C WLCSP Tape & Reel GH 1. Other voltage and output current options are available. Contact an On Semiconductor representative. Table 2. RECOMMENDED EXTERNAL COMPONENTS Component Description Vendor Parameter Typ Unit L 1.0 H, 20%, 2.3 A, 107 m , 1608 DFE160810S1R0M (Murata) L 1.0 H C 2.2 F, 20%, 6.3 V, X5R, 0402 C1005X5R0J225M050BC (TDK) C 2.2 IN F C (Note 2) C1608X5R0J226M080AC (TDK) C 22 22 F, 20%, 6.3 V, X5R, 0603 OUT 2. A 10 F, 0402 capacitor can be used to reduce total solution size at the expense of load transient performance. Pin Configuration EN A2 VIN VIN A1 EN A1 A2 MODE SW SW B1 MODE B1 B2 B2 C1 C1 C2 C2 FB GND GND FB Figure 2. Top View Figure 3. Bottom View Table 3. PIN DEFINITIONS Pin Name Description A1 EN Enable. The device is in Shutdown Mode when voltage to this pin is <0.4 V and enabled when >1.2 V. Do not leave this pin floating. Recommended for GPIO 1.8 V to drive this pin. A2 VIN Input Voltage. Connect to input power source across C . IN B1 MODE MODE. Logic LOW allows the IC to be in a Super Low IQ (SLIQ) state. A Logic HIGH allows the part to be in normal Iq state Auto Mode. B2 SW Switching Node. Connect to SW pad of inductor. C1 FB Feedback. Connect to positive side of output capacitor. C2 GND Ground. Power and IC ground. All signals are referenced to this pin. Table 4. ABSOLUTE MAXIMUM RATINGS Symbol Parameter Min Max Unit V Input Voltage 0.3 6.5 V IN V Voltage on SW Pin 0.3 V +0.3 (Note 3) V SW IN V EN, FB and Mode Pin Voltage 0.3 V +0.3 (Note 3) V CTRL IN ESD Human Body Model per JESD22A114 2.0 kV Charged Device Model per JESD22C101 1.0 T Junction Temperature 40 +150 C J T Storage Temperature 40 +150 C STG T Lead Soldering Temperature, 10 Seconds +260 C L Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed, damage may occur and reliability may be affected. 3. Lesser of 6 V or V + 0.3 V IN www.onsemi.com 2