TS1910A 680kHz/1.2MHz High Voltage Boost Converter SOP-8EP Pin Definition: 1. COMP 8. SS 2. FB 7. FREQ 3. EN 6. VCC 4. GND 5. LX General Description The TS1910A is a high performance, high efficiency step up DC-DC Converter with integrated 2A. The TS1910A converter input voltage ranging from 2.6 to 5.5V. The Output voltage can be set up to 27V. The selectable frequency of 680kHz and 1.2MHz allows the use of small external inductors and capacitors and provides fast transient response. Current mode control with external compensation network makes it easy to stabilize the system and keep maximum flexibility. Programmable soft start function minimizes impact on the input power system. Internal power MOSFET with very low RDS(ON) provides high efficiency. The TS1910A automatically transits from PWM to PFM during light load condition further increasing efficiency. The converter also provides protection functions such as Current Limit and Thermal shutdown. Features Application ● 2.6V to 5.5V operating input voltage range ● Digital Still Cameras ● Adjustable output voltage range up to 27V ● Portable Electronics ● Up to 3A output switch current ● PDA’s and Palm-Top Computers ● 680K/1.2MHz Selectable Switching Frequency ● Local Boost Regulator ● Programmable soft-start function ● External Compensation Network ● Current limit and Thermal shutdown protection ● Under voltage Lockout ● ≤1µA Shutdown Current Ordering Information Part No. Package Packing TS1910ACS RLG SOP-8EP 2.5Kpcs / 13” Reel Note: “G” denotes for Halogen Free Absolute Maximum Rating Parameter VCC Pin Voltage Symbol Limit Unit VCC GND - 0.3 to GND + 6 V EN, FREQ,COMP,FB,SS, Pin Voltage GND - 0.3 to VCC + 0.3 V LX Pin Voltage VLX 30 V Power Dissipation PD ( TJ-TA ) / θJA mW Storage Temperature Range TST -65 to +150 °C Operating Junction Temperature Range TOP -40 to +125 °C Thermal Resistance from Junction to case θJC 15 °C/W Thermal Resistance from Junction to ambient θJA 40 °C/W Note: θJA is measured with the PCB copper area of approximately 1.5 in2(Multi-layer). That copper area needs connect to exposed pad. 1/8 Version: A12 TS1910A 680kHz/1.2MHz High Voltage Boost Converter Electrical Specifications (Ta = 25oC, VIN=5V, EN=VIN, IL=0A unless otherwise noted) Characteristics Symbol Conditions Min Typ Input Voltage range Units 2.6 -- 5.5 V -- 2.35 2.6 V UVLOhys -- -150 -- mV Step-Up Voltage Adjust Range VOUT VCC+0.5 -- 27 V Operating quiescent current ICCQ IOUT=0mA, VFB=1.5V -- 150 250 µA Shutdown current ISD VEN=0V -- 0.1 1 µA Feedback Voltage VFB 1.219 1.238 1.257 V -100 0.01 +100 nA -- 0.2 -- % - 0.3 -- % FREQ=High 900 1200 1500 FREQ=Low 500 680 850 Under Voltage Lockout UVLO Hysteresis FB Input Leakage Current VCC Max UVLO IFB-LKG Line Regulation REGLINE Load Regulation REGLOAD Rising VFB = 1.5V VIN=2.6 to 5.5V IOUT=20mA VIN=5V IOUT= 1mA to 0.7A Oscillator frequency FOSC FREQ high-level input voltage VFQ-IH 2 -- -- FREQ low-level input voltage VFQ-IL -- -- 0.5 FREQ input leakage current IFQ-LKG -- -- 0.1 uA 4 7 13 µA Duty=40% 3 3.8 - A VIN=3V, ISW =2A -- 200 280 VIN=5V, ISW =2A -- 160 220 Soft Start Current ISS N-channel MOSFET current limit ILIM MOSFET on-resistance (Note) RDS(on) FREQ=GND KHz V mΩ EN high-level input voltage VIH 1.0 -- -- V EN low-level input voltage VIL -- - 0.4 V EN Hysteresis ENhys -- 200 - mV EN input leakage current IEN-LKG VEN=GND or VIN -- 0.01 0.1 µA VFB=0V 85 90 -- % VLX =25V, VFB=1.5V -- -- 10 µA Maximum Duty Cycle Duty LX Leakage Current ILXL Thermal Shutdown TSD -- 150 -- Thermal Shutdown Hysteresis Thys -- 35 -- °C Note: Guaranteed by design 2/8 Version: A12 TS1910A 680kHz/1.2MHz High Voltage Boost Converter Block Diagram VCC Soft Start 1.238V Reference Thermal Shutdown Enable/ Disable EN 7uA Error Amplifier SS LX Summing Comparator FB Control and Driver Logic COMP N-MOS Oscillator FREQ SGND Current Sense Slope Compensation PGND Pin Description Pin Number Pin Name Description 1 2 3 4 5 6 COMP FB EN GND LX VCC 7 FREQ 8 SS Compensation Pin Feedback Pin Enable Pin Ground Pin Switch Output Pin Power Input pin Frequency select pin. The power switch operates at 680kHz if FREQ is connected to GND and at 1.2MHz if FREQ is connected to VCC Soft start Pin. Connect a capacitor to GND 3/8 Version: A12 TS1910A 680kHz/1.2MHz High Voltage Boost Converter Application Circuit FREQ=High (Frequency=1.2MHz) VIN=5V 4.7uH R3 4.7~100Ω C2 2*10uF C4 0.1uF 6 VCC 7 FREQ 3 EN 1 COMP 1M C8 1nF B340A R2 C1 130K U1 R4 VOUT=12V D1 L1 LX 5 2 FB 4 GND 8 SS AX5510A R6 100K 220pF C3 R8 15K 3*10uF C6 10nF C7 100pF R2 VOUT = 1.238V X (1 + ------- ) R8 R8 Suggest 10K~30K VIN ≦ 4.5V, R3=10Ω VIN > 4.5V, R3=100Ω FREQ=Low (Frequency=680KHz) VIN=5V D1 B340A L1 VOUT=12V 6.8uH R3 4.7~100Ω C2 2*10uF C4 0.1uF VCC 7 FREQ 3 EN 1 COMP R4 1M C8 1nF R7 10K R2 130K 220pF C1 U1 6 LX 5 2 FB 4 GND 8 SS AX5510A R6 100K C3 R8 15K 3*10uF C6 10nF C7 100pF R2 VOUT = 1.238V X (1 + ------- ) R8 R8 Suggest 10K~30K VIN ≦ 4.5V, R3=10Ω VIN > 4.5V, R3=100Ω 4/8 Version: A12 TS1910A 680kHz/1.2MHz High Voltage Boost Converter Compensation Table Frequency(Hz) 680K (FREQ=Low) 1.2M (FREQ=High) L1 (H) VIN (V) VOUT (V) R6 (Ω) C7 (F) 2.5~4.4 5 10K 1.2n 2.5~5.5 7 15K 470p 2.5~5.5 9 27K 270p 2.5~5.5 12 56K 150p 2.5~5.5 15 150K 120p 2.5~5.5 18 110K 100p 2.5~5.5 21 150K 82p 2.5~5.5 24 100K 47p 2.5~4.0 5 33K 1n 2.5~5.5 7 39K 390p 2.5~5.5 9 39K 220p 2.5~5.5 12 100K 100p 2.5~5.5 15 130K 68p 2.5~5.5 18 150K 56p 2.5~5.5 21 220K 47p 2.5~5.5 24 390K 39p 6.8u 4.7u Application Information Setting the Output Voltage Application circuit item shows the basic application circuit with TS1910A adjustable output version. The external resistor sets the output voltage according to the following equation: VOUT=1.238V x (1+R2/R8) For most applications, R8 is a suggested a value by 10~30KΩ. Place the resistor-divider as close to the IC as possible to reduce the noise sensitivity. Soft Start Capacitor The soft-start function begins from SS pin Voltage=0V to VCC with a 7uA (typ.) constant current charging to the softstart capacitor, so the capacitor should be large enough to let the output voltage reach regulation inside the soft-start cycle. Typical value of soft-start capacitor range is from 4.7nF to 100nF. After the cycle finished, the load can start to draw maximum current as required. Frequency Select Pin (FREQ) The frequency select pin FREQ allows to set the switching frequency of the device to 680 KHz (FREQ = low) or 1.2 MHz (FREQ = high). Higher switching frequency improves load transient response but reduces slightly the efficiency. The other benefits of higher switching frequency are a lower output ripple voltage. Usually, it is recommended to use 1.2 MHz switching frequency unless light load efficiency is a major concern. 5/8 Version: A12 TS1910A 680kHz/1.2MHz High Voltage Boost Converter Application Information (Continue) Under Voltage Lockout (UVLO) To avoid mis-operation of the device at low input voltages an under voltage lockout is included that disables the device, if the input voltage falls below (2.35V-150mV). Input Capacitor Selection For better input bypassing, low-ESR ceramic capacitors are recommended for performance. Two parallel 10uF (or one 22uF) input capacitor is sufficient for most applications. For a lower output power requirement application, this value can be decreased. Output Capacitor Selection For lower output voltage ripple, low-ESR output capacitor like ceramic capacitor is recommended. Three 10uF ceramic capacitors work for most of the applications. Higher capacitor values can be used to improve the load transient response and reduce output ripple. Layout Guide 6/8 Version: A12 TS1910A 680kHz/1.2MHz High Voltage Boost Converter SOP-8EP Mechanical Drawing DIM A B C D E E1 F G K M P R 7/8 SOP-8EP DIMENSION MILLIMETERS INCHES MIN MAX MIN MAX. 4.80 5.00 0.189 0.196 3.80 4.00 0.150 0.157 1.35 1.75 0.054 0.068 0.35 0.49 0.014 0.019 2.05 2.41 0.081 0.095 2.82 3.30 0.111 0.130 0.40 1.25 0.016 0.049 1.27BSC 0.05BSC 0.10 0.25 0.004 0.009 0º 7º 0º 7º 5.80 6.20 0.229 0.244 0.25 0.50 0.010 0.019 Version: A12 TS1910A 680kHz/1.2MHz High Voltage Boost Converter Notice Specifications of the products displayed herein are subject to change without notice. TSC or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies. Information contained herein is intended to provide a product description only. No license, express or implied, to any intellectual property rights is granted by this document. Except as provided in TSC’s terms and conditions of sale for such products, TSC assumes no liability whatsoever, and disclaims any express or implied warranty, relating to sale and/or use of TSC products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right. The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications. Customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify TSC for any damages resulting from such improper use or sale. 8/8 Version: A12