TS1910 TSC | Alldatasheet

Document overview

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Technical content

Features

  • 2.6V to 5.5V operating input voltage range
  • Adjustable output voltage range up to 27V
  • Up to 2A output switch current
  • 680K/1.2MHz Selectable Switching Frequency
  • Programmable soft-start function
  • External Compensation Network
  • Current limit and Thermal shutdown protection
  • Under voltage Lockout
  • ≤1µA Shutdown Current Application
  • Digital Still Cameras
  • Portable Electronics
  • PDA’s and Palm-Top Computers
  • Local Boost Regulator

Ordering Information

Part No. Package Packing TS1910CS RLG SOP-8EP 2.5Kpcs / 13” Reel Note: “G” denotes for Halogen Free Absolute Maximum Rating Parameter Symbol Limit Unit VCC Pin Voltage VCC GND - 0.3 to GND + 6 V EN, FREQ,COMP,FB,SS, Pin Voltage GND - 0.3 to V CC + 0.3 V LX Pin Voltage VLX 30 V Power Dissipation PD ( T J-TA ) / θJA mW Storage Temperature Range T ST -65 to +150 ° C Operating Junction Temperature Range T OP -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. Pin Definition : 1. COMP 8. SS 2. FB 7. FREQ 3. EN 6. VCC 4. GND 5. LX

680kHz/1.2MHz High Voltage Boost Converter 2/8 Version: A12 Electrical Specifications (Ta = 25 oC, VIN =5V, EN=VIN , I L=0A unless otherwise noted) Characteristics Symbol Conditions Min Typ Max Units Input Voltage range V CC 2.6 -- 5.5 V Under Voltage Lockout UVLO Rising -- 2.35 2.6 V UVLO Hysteresis UVLOhys -- -150 -- mV Step-Up Voltage Adjust Range V OUT V CC +0.5 -- 27 V Operating quiescent current I CCQ I OUT = 0mA, V FB =1.5V -- 150 250 µA Shutdown current I SD V EN =0V -- 0.1 1 µA Feedback Voltage V FB 1.219 1.238 1.257 V FB Input Leakage Current I FB-LKG V FB = 1.5V -100 0.01 +100 nA Line Regulation REG LINE VIN =2.6 to 5.5V IOUT =20mA -- 0.2 -- % Load Regulation REG LOAD VIN =5V IOUT = 1mA to 0.4A - 0.15 -- % Oscillator frequency F OSC FREQ=High 900 1200 1500 KHz FREQ=Low 500 680 850 FREQ high-level input voltage V FQ-IH 2 -- -- V FREQ low-level input voltage V FQ-IL -- -- 0.5 FREQ input leakage current I FQ-LKG FREQ=GND -- -- 0.1 uA Soft Start Current I SS 4 7 13 µA N-channel MOSFET current limit I LIM Duty=40% 2 2.5 - A MOSFET on-resistance (Note) R DS(on) VIN =3V, I SW =1A -- 200 280 m Ω VIN =5V, I SW =1A -- 160 220 EN high-level input voltage V IH 1.0 -- -- V EN low-level input voltage V IL -- - 0.4 V EN Hysteresis ENhys -- 200 - mV EN input leakage current I EN-LKG V EN =GND or V IN -- 0.01 0.1 µA Maximum Duty Cycle Duty V FB =0V 85 90 -- % LX Leakage Current I LXL V LX = 25V, VFB =1.5V -- -- 10 µA Thermal Shutdown TSD -- 150 -- ° C Thermal Shutdown Hysteresis Thys -- 35 -- Note: Guaranteed by design

680kHz/1.2MHz High Voltage Boost Converter 3/8 Version: A12 Block Diagram VCC SS LX SGND Control and Driver Logic EN COMP 1.238V Reference Soft Start Current Sense Slope Compensation Oscillator FB Error Amplifier Summing Comparator Thermal Shutdown 7uA Enable/ Disable PGND N-MOS FREQ Pin Description Pin Number Pin Name Description

1 COMP Compensation Pin

2 FB Feedback Pin

3 EN Enable Pin

4 GND Ground Pin

5 LX Switch Output Pin

6 VCC Power Input pin

7 FREQ 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 8 SS Soft start Pin. Connect a capacitor to GND

680kHz/1.2MHz High Voltage Boost Converter 4/8 Version: A12 Application Circuit FREQ=High (Frequency=1.2MHz) 15K VIN=5V 2*10uF 4.7uH 130K VOUT=12V 100pF AX5510A 5VCC EN COMP FB SS GND FREQ LX 0.1uF 3*10uF 100K C6 10nF B340AR3 1nF R8 Suggest 10K~30K 220pF VIN ≦ 4.5V, R3=10 Ω VIN > 4.5V, R3=100 Ω 4.7~100 Ω FREQ=Low (Frequency=680KHz) 15K VIN=5V 2*10uF 6.8uH R2130K VOUT=12V 100pF AX5510A 5VCC EN COMP FB SS GND FREQ LX 0.1uF 3*10uF 100K C6 10nF B340A 1nF R8 Suggest 10K~30K 10K 220pF VIN ≦ 4.5V, R3=10 Ω VIN > 4.5V, R3=100 Ω 4.7~100 Ω

680kHz/1.2MHz High Voltage Boost Converter 5/8 Version: A12 Compensation Table Frequency(Hz) L1 (H) VIN (V) VOUT (V) R6 ( Ω) C7 (F) 680K (FREQ=Low) 6.8u 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 1.2M (FREQ=High) 4.7u 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

Application Information

Setting the Output Voltage 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 10~30K Ω. 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 soft- start 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.

680kHz/1.2MHz High Voltage Boost Converter 6/8 Version: A12 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

680kHz/1.2MHz High Voltage Boost Converter 7/8 Version: A12 SOP-8EP Mechanical Drawing SOP-8EP DIMENSION DIM MILLIMETERS INCHES MIN MAX MIN MAX. A 4.80 5.00 0.189 0.196 B 3.80 4.00 0.150 0.157 C 1.35 1.75 0.054 0.068 D 0.35 0.49 0.014 0.019 E 2.05 2.41 0.081 0.095 E1 2.82 3.30 0.111 0.130 F 0.40 1.25 0.016 0.049 G 1.27BSC 0.05BSC K 0.10 0.25 0.004 0.009 M 0º 7º 0º 7º P 5.80 6.20 0.229 0.244 R 0.25 0.50 0.010 0.019

680kHz/1.2MHz High Voltage Boost Converter 8/8 Version: A12 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.