Datasheet AS1302 5V/30mA Adaptive Inductorless Boost Converter 1 General Description 2 Key Features The AS1302 is a 30mA inductorless boost converter using a double H-bridge charge-pump topology with two external flying capacitors. The AS1302 charge pump features 1:2 and 2:3 operation modes as well as a 1:1 operation mode where the input is directly connected to the output. ! Up to 90% Efficiency ! 2.9V to 5.15V Input Voltage ! Regulated 5V Output ! Automatic Mode Switching ! <1µA Shutdown Current The AS1302 runs on a 1.2MHz fixed frequency and is utilized with a low noise regulation scheme to allow usage together with sensitive RF circuitry from the same battery supply. Additionally to increase efficiency the AS1302 switches to 49kHz at light loads. ! Startup with Full Load (within 1ms) ! Up to 30mA Load Current ! Short Circuit Protection ! Output Disconnected During Shutdown Designed to reside in portable and space limited equipment the 1.2MHz charge pump converts a 2.9V to 5.15V input to regulated 5V output with 3% accuracy. ! Soft-Start ! No Inductor Required ! Small External Components Required (COUT =2.2µF, CFLY =220nF) ! Low Noise Fixed Frequency (1.2MHz, 49kHz) Charge Pump: The shutdown function reduces the supply current to <1µA and disconnects the load from the output. The integrated soft-start circuitry prevents high inrush currents being drawn from the battery during start-up. The AS1302 includes built-in under-voltage lockout, short circuit-, and thermal protection circuitry. The AS1302 is available in TDFN (3x3x0.8mm) 10-pin and an extremely small 1.2x1.2mm WL-CSP 8-bumps package with 0.4mm pitch. ! - 1:1 Battery Feed Through Mode - 2:3 Single Phase Mode - 1:2 Single Phase Mode Package Options: - TDFN (3x3x0.8mm) 10-pin - WL-CSP 8-bumps with 0.4mm Pitch 3 Applications The device is ideal for two or three AA cells or a single Li-Ion battery cell to 5V conversion, mobile phones, portable instruments, microprocessor based systems and remote data-acquisition systems. Figure 1. AS1302 - Typical Application Diagram CFLY1 220nF C1+ VBATT 2.9V to 5.15V C1- VBATT CBAT 2.2µF On Off VOUT VOUT = 5V COUT 2.2µF AS1302 EN GND C2+ C2220nF CFLY2 www.austriamicrosystems.com Revision 1.02 1 - 18 AS1302 Datasheet - P i n A s s i g n m e n t s 4 Pin Assignments Figure 2. Pin Assignments (Through View) GND 1 10 EN C1- 2 NC 3 C1- GND EN A1 A2 A3 9 VBATT AS1302 C1+ 4 C1+ 8 C27 NC C1 GND VOUT 5 B1 6 C2+ B3 C2 VBATT C3 VOUT C2+ C2WL-CSP 8-bumps TDFN (3x3x0.8mm) 10-pin Pin Descriptions Table 1. Pin Descriptions Pin Name C1GND Pin Number A1 A2 EN A3 C1+ B1 VBATT B3 VOUT C1 C2+ C2- C2 C3 www.austriamicrosystems.com Description Connector 1-. Negative terminal of flying cap 1. Ground. Enable. (operating if EN = 1). Set this digital input to logic high for normal operation. For shutdown, set to logic low. Connector 1+. Positive terminal of flying cap 1. +2.9V to 5.15V Input Voltage. Bypass this pin to GND with a ≥2.2µF low ESR ceramic capacitor. +5V Output Voltage. This pin must be bypassed with a ≥2.2µF low ESR ceramic capacitor. Connector 2+. Positive terminal of flying cap 2. Connector 2-. Negative terminal of flying cap 2. Revision 1.02 2 - 18 AS1302 Datasheet - A b s o l u t e M a x i m u m R a t i n g s 5 Absolute Maximum Ratings Stresses beyond those listed in Table 2 may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in Section 6 Electrical Characteristics on page 4 is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Table 2. Absolute Maximum Ratings Parameter Min Max Units All pins to GND -0.3 +7.0 V Operating Temperature Range -40 +85 ºC Storage Temperature Range -65 +125 ºC ESD Package Body Temperature www.austriamicrosystems.com Notes 2 kV HBM MIL-Std. 883E 3015.7 methods 500 V CDM JESD22-C101C methods ºC The reflow peak soldering temperature (body temperature) specified is in accordance with IPC/JEDEC J-STD020D “Moisture/Reflow Sensitivity Classification for Non-Hermetic Solid State Surface Mount Devices”. The lead finish for Pb-free leaded packages is matte tin (100% Sn). +260 Revision 1.02 3 - 18 AS1302 Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s 6 Electrical Characteristics VBATT = 2.9V to 5.15V, VOUT = 5V, COUT = CBAT = 2.2µF, CFLY1 = CFLY2 =220nF, TAMB = -40 to +85ºC. Typical values are at TAMB = +25ºC and VIN = 3.3V, unless otherwise specified. Table 3. Electrical Characteristics Symbol Parameter Conditions VBATT(on) Undervoltage Lockout Rising VBATT VBATT(off) Undervoltage Lockout Falling VBATT VBATT Battery Supply Voltage VOUT Output Voltage Accurracy Min 2.4 Typ Max Units 2.8 2.9 V 2.5 2.8 V 5.15 V 5.15 V 2.9 IOUT = 0mA, 15mA 4.85 5.0 ΔVO/ΔIO11 Load Regulation in 1:1 Mode VBATT = 5.4V, IOUT = 10~30mA 2 ΔVO/ΔIO23 Load Regulation in 2:3 Mode VBATT = 4.3V, IOUT = 10~30mA 3 ΔVO/ΔIO12 Load Regulation in 1:2 Mode VBATT = 3.3V, IOUT = 10~30mA 3 Vtgr11/23 Vtgr23/12 IOUT Vripple Iinr Ishort Mode Switching Voltage Load Current 2:3 / 1:2 mode, falling VBATT 3.6 Mode switching voltage hysteresis 150 V mV 30 mA VBATT = 3.6V, IOUT = 30mA 22 mVPP VBATT = 3.6V, IOUT = 2mA 40 mVPP Output Voltage Ripple 2 Inrush Current 150 mA Short-Circuit Current 150 mA Efficiency in Switching Mode η23 IOP12 Operating Quiescent Current IOP11 IOFF 5.1 1 η12 IOP23 1:1 / 2:3 mode, falling VBATT mV/mA Shutdown Current 1:2 mode, VBATT = 2.9V, IOUT = 30mA 85 % 2:3 mode, VBATT = 3.8V, IOUT = 30mA 85 % VBATT = 3.4V (1:2 mode without load) 240 300 VBATT = 4.5V (2:3 mode without load) 170 230 VBATT = 5.3V (1:1 mode without load) 100 150 EN = 0V 0.01 1 µA 1.1 5.5 V 0.0 0.4 V µA Input Levels VIH Input High Level VIL Input Low Level pin EN Timing fOSC tSTART Oscillator Frequency VBATT = 3.6V, IOUT = 30mA 0.9 1.2 1.5 MHz VBATT = 3.6V, IOUT = 2mA 40 49 65 kHz 0.5 1 ms Startup Time Thermal Regulation TOFF Temperature Shutdown Temperature rising 145 Hysteresis 10 ºC 1. The device is tested in a proprietary test mode. 2. The inrush current is limited by the internal soft-start circuitry. www.austriamicrosystems.com Revision 1.02 4 - 18 AS1302 Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s 7 Typical Operating Characteristics VBATT = 3.3V, VOUT = 5V, COUT = CBAT = 2.2µF, CFLY1 = CFLY2 =220nF, TAMB = +25ºC, unless otherwise specified. Figure 4. Efficiency vs. Input Voltage; ILOAD = 10mA 100 100 90 90 80 80 70 70 Efficiency (%) Efficiency (%) Figure 3. Efficiency vs. Input Voltage; ILOAD = 1mA 60 50 1:2 mode 40 2:3 mode 1:1 mode 60 50 30 30 20 20 10 10 0 1:2 mode 40 2:3 mode 0 2.6 3 3.4 3.8 4.2 4.6 5 5.4 2.6 3 3.4 Input Voltage (V) 90 90 80 80 70 70 60 40 2:3 mode 1:1 mode Efficiency (%) 100 1:2 mode 4.2 4.6 5 5.4 Figure 6. Efficiency vs. Input Voltage; ILOAD = 30mA 100 50 3.8 Input Voltage (V) Figure 5. Efficiency vs. Input Voltage; ILOAD = 20mA Efficiency (%) 1:1 mode 60 50 40 30 30 20 20 10 10 0 1:2 mode 2:3 mode 1:1 mode 0 2.6 3 3.4 3.8 4.2 4.6 5 5.4 2.6 3 3.4 Input Voltage (V) 3.8 4.2 4.6 5 5.4 Input Voltage (V) Figure 7. Quiescent Current vs. Input Voltage Figure 8. Quiescent Current vs. Temperature 300 300 275 275 250 250 Quiescent Current (µA) Quiescent Current (µA) Vi n=3.4V (1:2 Mode) 225 200 175 150 125 100 75 Vi n=4.5V (2:3 Mode) Vi n=5.3V (1:1 Mode) 225 200 175 150 125 100 75 50 2.4 2.9 3.4 3.9 4.4 4.9 5.4 50 -45 -30 -15 Input Voltage (V) www.austriamicrosystems.com 0 15 30 45 60 75 90 Temperature (°C) Revision 1.02 5 - 18 AS1302 Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s Figure 10. Efficiency vs. Output Current; VBATT = 3.3V 100 100 90 90 80 80 70 70 60 Efficiency (%) Efficiency (%) Figure 9. Efficiency vs. Output Current; VBATT = 2.9V 49kHz 1.2MHz 50 40 60 49kHz 40 30 30 20 20 10 10 0 0 0.1 1 10 100 0.1 Output Current (mA) 10 100 Figure 12. Efficiency vs. Output Current; VBATT = 4V 100 100 90 90 80 80 70 70 Efficiency (%) Efficiency (%) 1 Output Current (mA) Figure 11. Efficiency vs. Output Current; VBATT = 3.6V 60 49kHz 1.2MHz 50 40 60 49kHz 1.2MHz 50 40 30 30 20 20 10 10 0 0 0.1 1 10 100 0.1 Output Current (mA) 10 100 Figure 14. Efficiency vs. Output Current; VBATT = 5.4V 100 90 90 80 80 70 70 Efficiency (%) 100 60 1 Output Current (mA) Figure 13. Efficiency vs. Output Current; VBATT = 4.3V Efficiency (%) 1.2MHz 50 49kHz 1.2MHz 50 40 60 50 40 30 30 20 20 10 10 0 permanent 1:1 Mode 0 0.1 1 10 100 0.1 Output Current (mA) www.austriamicrosystems.com 1 10 100 Output Current (mA) Revision 1.02 6 - 18 AS1302 Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s Figure 15. Output Voltage vs. Output Current Figure 16. Output Voltage vs. Output Current 5.15 5.15 49kHz 5.1 1.2MHz Output Voltage (V) Output Voltage (V) 5.1 5.05 5 4.95 4.9 49kHz 5.05 5 4.95 4.9 Vi n = 2.9V Vi n = 3.0V Vi n = 3.3V Vi n = 3.6V Vi n = 4.3V 4.85 0.01 0.1 Vi n = 4.0V 1 10 4.85 0.01 100 0.1 Output Current (mA) 1 10 100 Output Current (mA) Figure 17. Output Voltage vs. Input Voltage Figure 18. Output Voltage vs. Temperature 5.15 5.15 1:2 mode 2:3 mode 5.1 1:1 mode 5.05 5 4.95 Iout = 4mA 4.9 Output Voltage (V) 5.1 Output Voltage (V) 1.2MHz 5.05 5 4.95 4.9 Iout = 10mA Iout = 0.1mA Iout = 10mA Iout = 20mA Iout = 30mA Iout = 30mA 4.85 2.9 3.2 3.5 3.8 4.1 4.4 4.7 5 5.3 4.85 -45 -30 -15 Input Voltage (V) 0 15 30 45 60 75 90 Temperature (°C) Figure 19. Startup Time vs. Input Voltage; load=166Ω 1 Startup Time (ms) 0.875 0.75 0.625 0.5 0.375 0.25 0.125 0 2.9 3.15 3.4 3.65 3.9 4.15 4.4 4.65 4.9 Input Voltage (V) www.austriamicrosystems.com Revision 1.02 7 - 18 AS1302 Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s 50mA/Div Figure 21. Inrush Current; no load 2V/Div 2V/Div EN EN 1V/Div VOUT VOUT 2V/Div Iinr Figure 20. Turn-ON / Turn-OFF Time @ load = 166Ω 200µs/Div 50µs/Div Figure 22. Switching Frequency vs. Input Voltage; IOUT = 2mA Figure 23. Switching Frequency vs. Input Voltage; IOUT = 20mA 1.5 Switching Frequency (MHz) Switching Frequency (kHz) 65 60 55 50 45 40 1.4 1.3 1.2 1.1 1 0.9 2.9 3.2 3.5 3.8 4.1 4.4 4.7 5 2.9 3.2 Input Voltage (V) 4.1 4.4 4.7 5 Figure 25. Switching Frequency vs. Temperature; IOUT = 20mA 65 1.5 Switching Frequency (MHz) Switching Frequency (kHz) 3.8 Input Voltage (V) Figure 24. Switching Frequency vs. Temperature; IOUT = 2mA 60 55 50 45 40 -45 -30 -15 3.5 0 15 30 45 60 75 90 1.4 1.3 1.2 1.1 1 0.9 -45 -30 -15 Temperature (°C) www.austriamicrosystems.com 0 15 30 45 60 75 90 Temperature (°C) Revision 1.02 8 - 18 AS1302 Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s 50mV/Div 10mA IOUT VOUT VOUT 50mV/Div 10mA IOUT 30mA Figure 27. Load Transient; Mode = 2:3, IOUT = 30 to 10 to 30 mA 30mA Figure 26. Load Transient; Mode = 1:1, IOUT = 30 to 10 to 30 mA 500µs/Div 500µs/Div 500µs/Div 500µs/Div 1V/Div VOUT C2- 5mV/Div VIN VOUT 20mV/Div - BW=20MHZ Figure 31. Output Ripple 3.8V 4.8V Figure 30. Line Transient 5ms/Div www.austriamicrosystems.com 50mV/Div VOUT VOUT 50mV/Div 10mA 4mA IOUT IOUT 20mA Figure 29. Load Transient; Mode = 1:2, IOUT = 20 to 4 to 20 mA 30mA Figure 28. Load Transient; Mode = 1:2, IOUT = 30 to 10 to 30 mA 10µs/Div Revision 1.02 9 - 18 AS1302 Datasheet - D e t a i l e d D e s c r i p t i o n 8 Detailed Description Functional Description The AS1302 is a high efficiency and low noise switched capacitor DC-DC converter that is capable of boost operation. It is equipped with two built-in coupled H-bridge type switch configurations. Based on the value of the output voltage the system automatically initiates mode-switching to achieve the highest possible efficiency. The regulation of the output voltage is achieved by a regulation loop, which modulates the current drive capability of the power transistors so that the amount of charge transferred from the input to the output at each clock cycle is controlled and is equal to the charge needed by the load. Regulation Loop The AS1302 operates at a constant frequency. For the regulation loop power transistors, a resistor divider and an error amplifier are used to keep the output voltage within the allowed limits. The error amplifier takes the feedback and reference signals as inputs and generates the error voltage signal. The error voltage controls a driver that triggers the gate voltage of the power transistor which modulates the current drive capability of the power amplifier. The modulated transistor controls the charge transferred from the input to the output and therefore the regulation of the output is realized. This regulation concept which is based on adjusting the amount of charge transferred, delivers the smallest voltage ripple possible. Figure 32. AS1302 - Functional Block Diagram CFLY1 C1+ VBATT C1- CFLY2 C2+ C2VOUT Double-H Bridge Topology + CBAT COUT ∫ i ( t ) dt Vctrl Vmode Softstart Mode Select Ref POR State Machine & Control Logic Temp Bias CLK On Off EN AS1302 GND Light/Heavy Load Monitor To detetect the output current in the 2:3 and in the 1:2 mode, a current sense is used. The device switches to a lower switching frequency (49kHz typ), due to a detected light-load condition. With this frequency an excellent light-load efficiency is achieved and no audible noise is generated. If the load is increasing (typically more than 3mA), the device operates at 1.2MHz. www.austriamicrosystems.com Revision 1.02 10 - 18 AS1302 Datasheet - D e t a i l e d D e s c r i p t i o n Switch Configuration The AS1302 has nine built-in power switches in the shape of two coupled H-bridge topologies. The system features 1:2 and 2:3 operation modes as well as a 1:1 operation where the input is directly connected to the output. In 2:3 operation mode two flying capacitors are placed in series and each capacitor is charged to the half of the input voltage. In pumping phase the flying capacitors are placed in parallel. The bottom-plates of the parallel flying capacitors CFLY1 and CFLY2 are connected to the input voltage so that the voltage at the top-plates of the flying capacitors is boosted to a voltage equal to VBATT + VBATT/2. By connecting the top-plates of the capacitors to the output, the output voltage in the 2:3 mode can be up to one and a half of VBATT. If the top-plate voltage is higher than 5V, the regulation loop adapts the power transistor’s on-resistance to drop some voltage. Figure 33. 2:3 Operating Mode Charging Phase Pumping Phase VOUT +5V VOUT +5V SW1 VBATT +2.9V to 5.15V SW1 SW2 VBATT +2.9V to 5.15V CFLY1 SW2 CFLY1 CFLY2 CFLY2 SW3 SW3 SW4 SW4 In 1:2 operation both flying capacitors are placed in parallel to the input voltage, and therefore charged to the input voltage. During pumping phase the input voltage is connected to the bottom of the charged flying capacitors. The voltage at the top-plates of the parallel capacitors is now boosted to 2VBATT. By connecting the top-plates of the capacitors to the output, the output can be charged to twice the voltage of VBATT. If the top-plate voltage is higher than 5V the regulation loop limits the charge transfer to the output. Figure 34. 1:2 Operating Mode Charging Phase Pumping Phase VOUT +5V VOUT +5V SW1 VBATT +2.9V to 5.15V SW1 SW2 CFLY1 CFLY2 VBATT +2.9V to 5.15V SW2 CFLY1 CFLY2 SW3 SW3 SW4 www.austriamicrosystems.com SW4 Revision 1.02 11 - 18 AS1302 Datasheet - D e t a i l e d D e s c r i p t i o n Soft-start The soft-start circuit prevents the supply from high inrush currents caused by the converter’s power-up sequence. During the soft-start (0.5ms typ) the device limits the inrush current. The device is capable to power-up at the minimum specified battery voltage and with the maximum load (ohmic equivalent) applied to the output. Undervoltage Lockout, UVLO The AS1302 is equipped with an undervoltage lockout functionality. If the battery voltage drops below 2.5V (typ) the device enters the undervoltage lockout condition. The device remains in this condition until the battery voltage is high enough to enter the soft start sequence. An internal hysteresis of 300mV prevents ringing during startup. If the input voltage increases to 2.8V (typ) again after such a condition the device turns-on automatically. Shutdown Mode The AS1302 enters low-power shutdown mode when EN is set to logic low. In shutdown the charge-pump action is halted, the output is completely disconnected from the input and VOUT will drop to 0V. Short-Circuit Protection Short-circuit protection prevents damage to the device if the output is shorted to ground. Whenever the output voltage is pulled significantly below VBATT, short-circuit protection is triggered and limits the current. As soon as VOUT recovers the protection is released and the device enters soft-start mode. Thermal Shutdown The AS1302 offers thermal shutdown, which prevents damage due to an over-temperature condition. Thermal shutdown will be initiated if the junction temperature exceeds 145°C. If the temperature drops below this value, the thermal shutdown will be released automatically and the device resumes operation. A hysteresis prevents the thermal shutdown from oscillating. Efficiency Consideration In the 2:3 operation mode the input current of the charge pump is approximately 1.5x the load current. In an ideal charge pump the efficiency can be calculated by: V OUT V OUT × I OUT P OUT η = ------------- = ------------------------------------------- = ------------------------V BATT × 1, 5I OUT P IN 1, 5V BATT (EQ 1) The same works for the 1:2 operation mode. The input current of the charge pump is approximately 2x the load current. The efficiency of a charge pump in 1:2 operation mode can be calculated by: V OUT V OUT × I OUT P OUT η = ------------- = ------------------------------------- = ------------------P IN 2V BATT V BATT × 2I OUT (EQ 2) For typical and high output power conditions the quiescent current and the switching losses are negligible and (EQ 1) and (EQ 2) are valid. Hence, with the same input Voltage the 2:3 operation mode will result into a higher efficiency than the 1:2 operation mode. www.austriamicrosystems.com Revision 1.02 12 - 18 AS1302 Datasheet - A p p l i c a t i o n I n f o r m a t i o n 9 Application Information External Component Selection The high internal oscillator frequency of 1.2MHz permits the use of small capacitors for both, the flying capacitors and the output capacitors. For any given load the value of the flying- and output capacitors as well as their ESR are affecting the output voltage performance. In general, the capacitor’s ESR is inversely proportional to its physical size. Larger capacitances and higher voltage ratings tend to reduce ESR. The ESR is a function of the frequency too, so it must be rated at the devices operating frequency. Another factor affecting capacitor ESR is temperature. Note: Many capacitors have a huge capacity variation over temperature. This can be compensated by choosing a capacitor with a better thermal coefficient or by choosing a larger nominal value to ensure proper operation over temperature. It is not critical which type of input bypass capacitor CBAT and output filter capacitor COUT is used, but it will affect the performance of the charge pump. Low ESR capacitors should be used to minimize VOUT ripple. Multi-layer ceramic capacitors are recommended since they have extremely low ESR and are available in small footprints. Input Capacitor A 2.2µF input bypass low ESR capacitor such as tantalum or ceramic is recommended to reduce noise and supply transients. During startup and mode change it supplies a part of the peak input current drawn by the device. Output Capacitor The output capacitor is charged to VOUT during the pumping phase. The ESR of the output capacitor introduces spikes in the output voltage waveform whenever the charge pump charges COUT. These spikes contribute to the ripple voltage of VOUT. Therefore, ceramic or tantalum low ESR capacitors are recommended for COUT to minimize the output voltage ripple. Table 4. Recommended Input and Output Capacitors Part Number C TC Code Rated Voltage Dimensions GRM188R61C225KE15 2.2µF X5R 16V 0603 GRM21BR71E225KA73 2.2µF X7R 25V 0805 GRM188R60J475KE19 4.7µF X5R 6.3V 0603 GRM188R60J106ME47 10µF X5R 6.3V 0603 Figure 35. Load Regulation Comparision with different Capacitors Manufacturer Murata www.murata.com Figure 36. Output Ripple vs. Output Current Comparision with different Capacitors 100 5.15 2.2µF 16V 0603 49kHz 2.2µF 25V 0805 4.7µF 6.3V 0603 80 Output Ripple (mV) Output Voltage (V) 5.1 1.2MHz 5.05 5 4.95 60 40 20 2.2µF 16V 0603 4.9 10µF 6.3V 0603 2.2µF 25V 0805 4.7µF 6.3V 0603 10µF 6.3V 0603 4.85 0 0 5 10 15 20 25 30 Load Current (mA) www.austriamicrosystems.com 0 5 10 15 20 25 30 Load Current (mA) Revision 1.02 13 - 18 AS1302 Datasheet - A p p l i c a t i o n I n f o r m a t i o n Flying Capacitor Selection To ensure the required output current and avoid high peak currents the values of the flying capacitors CFLY1 and CFLY2 are very critical. A 220nF capacitor is sufficient for most applications. Dependent on the operation mode the AS1302 alternately charges and discharges the CFLY1/2 . While the ESR of the output capacitor produces a part of the output voltage ripple, the ESR of the flying capacitors directly adds to the charge pump’s output source resistance. Therefore low ESR capacitors, e.g. tantalum or ceramic, are recommended for the flying capacitors as well. Due to different materials for ceramic capacitors the on the material depending temperature and voltage coefficients have to be considered. The capacitance of a X7R ceramic capacitor is more stable than a Z5U or Y5V ceramic capacitor over the whole temperature range from -40°C to +85°C. As an additional effect a Z5U or Y5V ceramic capacitor will loose about the half of his nominal capacitance when the rated voltage is applied. It is important to choose the ceramic capacitor according to the minimum available capacitance over the operating voltage and the bias voltage. This information is stated in the datasheets of the capacitor manufacturer. Table 5. Recommended Flying Capacitors Part Number C TC Code Rated Voltage Dimensions GRM188R71E224KA88 220nF X7R 25V 0603 GRM155R61A224KE19 220nF X5R 10V 0402 Manufacturer Murata www.murata.com Layout Consideration To achieve the best performance of the AS1302 a careful board layout is necessary to reduce the impact of the high switching frequency and the high transient currents which are produced by the device. For a proper regulation under all conditions a true ground plane and short connections to all external capacitors are needed. www.austriamicrosystems.com Revision 1.02 14 - 18 AS1302 Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s 10 Package Drawings and Markings The device is available in a TDFN (3x3x0.8mm) 10-pin and WL-CSP 8-bumps package. Figure 37. TDFN (3x3x0.8mm) 10-pin Package Diagram D2 SEE DETAIL B A D D2/2 B 2x E E2 E2/2 L aaa C PIN 1 INDEX AREA (D/2 xE/2) K PIN 1 INDEX AREA (D/2 xE/2) aaa C N N-1 2x e TOP VIEW e (ND-1) X e b bbb C ddd C A B BTM VIEW Terminal Tip DETAIL B A3 ccc C A C SIDE VIEW A1 SEATING PLANE 0.08 C Datum A or B ODD TERMINAL SIDE Table 6. TDFN (3x3x0.8mm) 10-pin Package Dimensions Symbol Min Typ Max A 0.70 0.75 0.80 A1 0.00 0.02 0.05 A3 0.20 REF L1 0.03 0.15 L2 0.13 aaa 0.15 bbb 0.10 ccc 0.10 ddd 0.05 eee 0.08 ggg 0.10 Symbol D BSC E BSC D2 E2 L θ k b e N ND Min 2.20 1.40 0.30 0º 0.20 0.18 Typ 3.00 3.00 0.40 0.25 0.50 10 5 Max 2.70 1.75 0.50 0.30 Note: 1. 2. 3. 4. Figure 37 is shown for illustration only. N is the total number of terminals. All dimensions are in millimeters, angle is in degrees. Dimensioning and tolerancing conform to ASME Y14.5M-1994. www.austriamicrosystems.com Revision 1.02 15 - 18 AS1302 Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s Figure 38. WL-CSP 8-bumps Package Diagram Bottom view Ball side 40 typ. 270 ±10 400 205±20 CCC 1210±20.00 200 typ. 20µm Top through view 205±20 1210±20.00 20 350 typ. 600±30 Notes: ccc Coplanarity All dimensions in µm www.austriamicrosystems.com Revision 1.02 16 - 18 AS1302 Datasheet - O r d e r i n g I n f o r m a t i o n 11 Ordering Information The device is available as the standard products shown in Table 7. Table 7. Ordering Information Ordering Code Marking AS1302-BWLT ASQ7 AS1302-BTDT ASQ7 Description 5V/30mA Adaptive Inductorless Boost Converter 5V/30mA Adaptive Inductorless Boost Converter Delivery Form Package Tape and Reel WL-CSP 8-bumps Tape and Reel TDFN (3x3x0.8mm) 10-pin Note: All products are RoHS compliant and Pb-free. Buy our products or get free samples online at ICdirect: http://www.austriamicrosystems.com/ICdirect For further information and requests, please contact us mailto:[email protected] or find your local distributor at http://www.austriamicrosystems.com/distributor www.austriamicrosystems.com Revision 1.02 17 - 18 AS1302 Datasheet Copyrights Copyright © 1997-2009, austriamicrosystems AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. All products and companies mentioned are trademarks or registered trademarks of their respective companies. Disclaimer Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application. 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Contact Information Headquarters austriamicrosystems AG Tobelbaderstrasse 30 A-8141 Unterpremstaetten, Austria Tel: +43 (0) 3136 500 0 Fax: +43 (0) 3136 525 01 For Sales Offices, Distributors and Representatives, please visit: http://www.austriamicrosystems.com/contact www.austriamicrosystems.com Revision 1.02 18 - 18