SY7807ADC

SY7807 1.5A flash LED boost driver for smart phone application Preliminary Specification General Description Features The SY7807 is a high efficiency, 2 MHz frequency synchronous Boost converter with 1.5A constant current drivers for high current white LED. SY7807 could operate in Torch mode or Flash mode. It is an ideal power solution for WLED photo flash applications within small PCB layout dimension and used in Lithiumion/polymer battery operated products. • • Ordering Information Temperature Code Package Code Optional Spec Code Package Type TSOT23-6 DFN2×2-6 • Dimming frequency: 20kHz~200kHz • • • SY7807 □(□□)□ Ordering Number SY7807ADC SY7807DEC • • Note ----------- Input voltage range: 2.7V to 5.5V. 2MHz switching frequency to achieve small total solution size. Drive up to 1.5A LED flash current Drive up to 300mA LED torch current • • • • • • Timeout function in flash mode Independent flash-mode enable and torch-mode enable pins Low RDS(ON) of internal FET: 180m ohm for PFET and 200m ohm for NFET. LED open/short protection Over-voltage protection 0.1 µA shutdown current Thermal shutdown. -40 to +85 C° Temperature Range Pb-free Package: TSOT23-6, DFN2×2-6 Applications • • Smart phone/digital camera LED flash. White LED driver. Typical Applications Fig.1 schematic SY7807 Rev. 0.2 Silergy Corp. Confidential- Prepared for Customer Use Only 1 SY7 7807 w) Pinou ut (top view (DF FN2×2-6) (TSO OT23-6) Part Number N SY7807A ADC SY7807D DEC Package typee TSOT23-6 DFN2×2-6 Toop Mark Mrxyz Tqxyz ① N ① ： x=yyear code, y=weeek code, z= lott number code. Note Pin Nam me IN TSOT223-6 1 DFN2×2-6 3 GND OUT 2 3 5 1 ENM LX ENF Exposeed PAD 4 5 6 6 2 4 Pin Description D Poweer supply input pin. Decouplee this pin to GN ND pin with 2.2uF or greateer ceramic capacitor. It receivves the input fr from 2.7V to 5..5V. Poweer Ground. Boostt output. Conneect a 2.2uF or greater ceramiic capacitor fro om OUT to GN ND. Torchh mode enable pin. Inducctor node. Conn nect an inductoor from power input to LX pin. Flash mode enable pin. p Connected to GND pin for electriccal and thermaal usage. Absolu ute Maxim mum Ratin ngs (Note 1) IN, OUT,, LX ----------------------------------------------------------------------------------------------------------------------------------V ENM, EN NF ---------------------------------------------------------------------------------------------------------------------- VIIN+0.3/6V Power Diissipation, PD@ TA=25°C, TSOT23-6----------------------------------------------------------------------------------- TBD PD@ TA=25°C, DFN2×2-6 D ---------------------------------------------------------------------------------- TBD Package Thermal T Resisttance (Note 2) T TSOT23-6 θ JAA ------------------------------------------------------------------------------------------------------------------------------------------------------------------ TBD T TSOT23-6 θ JCC ------------------------------------------------------------------------------------------------------------------------------------------------------------------ TBD D DFN2×2-6 θ JA J ---------------------------------------------------------------------------------------------------------------------------------------------------------------- TBD D DFN2×2-6 θ JC J ---------------------------------------------------------------------------------------------------------------------------------------------------------------- TBD Junction Temperature T R Range --------------------------------------------------------------------------------------------------------- 150°C Lead Tem mperature (Solldering, 10 secc.) ------------------------------------------------------------------------------------------- 300°C Storage Temperature T R Range ---------------------------------------------------------------------------------------------- 65°C C to 150°C Recom mmended Operating O g Conditioons (Note 3) IN, OUT, LX ----------------------------------------------------------------------------------------------------------------- --2.7 7V to 5.5V NF -------------------------------------------------------------------------------------------------------------------- VIN N+0.3/5.5V ENM, EN Junction Temperature T R Range --------------------------------------------------------------------------------------------- 40°C C to 125°C Ambient Temperature T R Range ----------------------------------------------------------------------------------------------- 40°°C to 85°C SY78007 Rev. 0.2 Silergy S Corpp. Confidenttial- Prepared for Custom mer Use Onlly 2 SY7807 Electrical Characteristics (VIN = 3.6V, TA = 25°C unless otherwise specified) Parameter Input Voltage Range Quiescent Current Shutdown Current NFET RON PFET RON OVP Rising Threshold OVP Hystersis Maximum Output Current Flash timeout LED Current Accuracy Symbol VIN IQ ISHDN RDS(ON)1 RDS(ON)2 OVPth OVPhys IMAX Ttimeout ILEDA Switching Frequency Input Logic Low Input Logic High VIN UVLO Rising Threshold UVLO Hysteresis Thermal Shutdown Temperature Thermal Shutdown Hysteresis FSW VIL VIH VINUVLO Test Conditions Min 2.7 ENM=’1’ or ENF=’1’, ILED=0 ENM=’0’, ENF=’0’ ENF=’1’ 750mA flash current 150mA torch current Typ 0.1 200 180 5 120 1.5 1.024 -13 -11 Max 5.5 1500 1 +13 +11 2 1.4 2.1 2.4 0.4 VIN 2.68 Unit V µA µA mΩ mΩ V mV A S % % MHz V V V UVLO,HYS TSD 0.1 150 V °C THYS 20 °C Note 1: Stresses beyond the “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability Note 2: θ JA is measured in the natural convection at TA = 25°C on a low effective single layer thermal conductivity test board of JEDEC 51-3 thermal measurement standard. Note 3. The device is not guaranteed to function outside its operating conditions SY7807 Rev. 0.2 Silergy Corp. Confidential- Prepared for Customer Use Only 3 SY7807 Function Description SY7807 is a 2MHz switching frequency boost flash LED driver capable of delivering up to 1.5A current into a single LED. Enable the Device: The driver IC will be shut down if both ENF and ENM are low. If ENF is high and ENM is low, the LED current will be ramped up to the flash mode current. If ENM is high whether ENF is high or low, the LED current will be ramped up to the torch mode current. Boost Mode & LDO Mode: When ENM or ENF is high level, SY7807 operates in LDO Mode to slowly charge output capacitor firstly. In LDO Mode, Boost converter stops switching and the internal PFET turns on as LDO to adjust the LED output current. If the internal PFET is fully turned on and VOUT is not high enough to provide desired LED current, SY7807 will enter into Boost Mode. When the Boost input voltage increase and/or the LED current setting value decreases, if the LED current is higher than setting value in Boost mode, SY7807 will quit boost mode and enter into LDO mode again. Torch Mode: Torch mode LED current is set a maximum current of 300mA internally. For additional flexibility, a lower torch mode current and flash mode current than the fixed setting value could be realized by applying a PWM dimming signal at ENM/ENF pin. Fig.2 shows the internal block diagram of PWM dimming circuit of SY7807.The external PWM signal could be used to adjust the internal LED current reference to adjust LED current. If the PWM signal is added at ENM pin, the torch LED current will be regulated to be:300xPWM duty cycle(mA). If the PWM signal is added at ENF pin, the flash LED current will be regulated to be:1500xPWM duty cycle(mA). It is recommended to apply the PWM signal frequency with 20kHz to 200kHz range. Figure2 Block Diagram of PWM dimming LED Short Protection: If OUT voltage is lower than 2.2V when IC has been enabled (torch or flash mode),the output current will be limited to 100mA. LED Over Voltage Protection(OVP): Flash Mode: Flash-mode LED current is set a maximum current of 1.5A internally. PWM Dimming: When the ENM pin is constantly high, the LED current is regulated to 300mA typically in torch mode. When the ENF pin is constantly high, the LED current is regulated to 1.5A typically in flash mode with a fixed flash time out event. The OVP threshold is typically 5V. Once OUT voltage is higher than OVP threshold, OVP event is triggered, the boost converter stops switching by turning off internal NFET and PFET, then resumes switching after the OUT voltage falls below the OVP threshold by the OVP hysteresis. Over Temperature Protection: When the SY7807’s junction temperature reaches +150℃, the IC will shut down. The IC will not start up again until the junction temperature falls below +130℃ or the power input is recycled. SY7807 Rev. 0.2 Silergy Corp. Confidential- Prepared for Customer Use Only 4 SY7807 Applications Information Input Capacitor CIN: The ripple current through input capacitor is calculated as: ICIN_RMS = VIN × (VOUT − VIN) 2 3 × L × FSW × VOUT X5R or X7R ceramic capacitors with greater than 2.2uF capacitance are recommended to handle this ripple current. To minimize the potential noise problem, place this ceramic capacitor to close to the IN pin and GND pin. Output Capacitor COUT: The output capacitor is selected to handle the output ripple noise requirements. This ripple voltage is related to the capacitance and its equivalent series resistance (ESR). For the best performance, it is recommended to use X5R or better grade low ESR ceramic capacitor. The voltage rating of the output capacitor should be higher than the maximum output voltage. The minimum required capacitance can be calculated as: COUT = ILED × (VOUT − VIN) FSW × VOUT × VRIPPLE VRIPPLE is the peak to peak output ripple. For LED applications, the equivalent resistance of the LED is typically low. The output capacitance should be large enough to attenuate the ripple current through LED. For most applications, a 2.2µF ceramic capacitor is sufficient. Inductor L: A 1µH~2.2µH inductor is recommended.(Reference Table 1).The DCR of the inductor and the core loss at the switching frequency must be low enough to achieve the desired high efficiency requirement. The saturation current rating of the inductor must be selected to be greater than the peak inductor current under full load conditions. Table 1. Recommended Inductor for SY7807 Part Number L (uH) DCR (mΩ) Saturation Current (A) Dimensions (L×W×H) (mm) VLS252010HBX1R0M 1 65 3.57 2.5×2×1 Layout Design: Proper PCB layout and components placement are critical to the performance of the IC and to prevent noise and electromagnetic interference problems. Following are some rules for the PCB layout: 1) The loop of OUT pin, output capacitor and GND pin must be as short as possible 2) It is desirable to maximize the PCB copper area connecting to GND pin to achieve the best thermal and noise performance. 3) CIN must be close to IN pin and GND pin. The loop area formed by CIN and GND must be minimized. 4) The PCB copper area associated with LX pin must be minimized to avoid the potential noise problem. SY7807 Rev. 0.2 Silergy Corp. Confidential- Prepared for Customer Use Only 5 SY7807 TSOT23-6 Package outline & PCB layout 1.90 1.50 - 1.70 1.00 2.70 - 3.00 2.40 2.80 - 3.10 0.95 0.60 0.30 - 0.50 0.25 REF 1.00 (max) 0.3 - 0.6 Notes: 0.01 - 0.1 0.1 - 0.20 Recommended Pad Layout 0.95 TYP 1.90 TYP All dimension in millimeter All dimension don’t include mold flash & metal burr SY7807 Rev. 0.2 Silergy Corp. Confidential- Prepared for Customer Use Only 6 SY7807 DFN2x2-6 Package outline Top View Bottom View Side View Recommended PCB Layout (Reference only) Notes: All dimension in millimeter and exclude mold flash & metal burr. SY7807 Rev. 0.2 Silergy Corp. Confidential- Prepared for Customer Use Only 7 SY7807 Taping & Reel Specification 1. Taping orientation 1) TSOT23-6 Feeding direction 2) DFN2×2-6 1.45/1.55 7.7/8.3 3.9/4.1 Feeding direction SY7807 Rev. 0.2 Silergy Corp. Confidential- Prepared for Customer Use Only 8 SY7807 2. Carrier Tape & Reel specification for packages Reel Size Package type Tape width (mm) Pocket pitch(mm) Reel size (Inch) Trailer length(mm) Leader length (mm) Qty per reel TSOT23-6 8 4 7" 400 160 3000 DFN2x2 8 4 7" 400 160 3000 3. Others: NA SY7807 Rev. 0.2 Silergy Corp. Confidential- Prepared for Customer Use Only 9