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Zetex Products For Mobile Phones

Zetex Products For Mobile Phones. February 2007. Applications within Mobile Phones. RF Power Amplifier MOSFETs and Schottky Diode. Camera Flash Strobe Charger MOSFET. Display Backlighting LED/OLED/LCD Driver and Schottky Diode. GPS Antenna Detection Current Monitor. Tuning Interface

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Zetex Products For Mobile Phones

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  1. Zetex Products For Mobile Phones February 2007

  2. Applications within Mobile Phones RF Power Amplifier MOSFETs and Schottky Diode Camera Flash Strobe Charger MOSFET Display Backlighting LED/OLED/LCD Driver and Schottky Diode GPS Antenna Detection Current Monitor Tuning Interface Varactor Diodes Power Management Low Drop Out Regulators Battery Management Current Monitor, Transistor and Schottky Diode

  3. Battery Management

  4. Cost Effective Unidirectional Gas Gauge • A common mobile phone battery gas gauge uses VBATT and TBATT • VBATT changes due to many factors • QBATT, TBATT, IDSCH, IDSCH profile IDSCH > I(C) • Sensing IDSCH improves accuracy • ZXCT1012 Micro-power CurrentMonitor Provides Simple Solution • IDSCH is measured & can be used: • Calculate charge remaining • To protect battery • To change capacity profile • QBATT can be measured • From assumption of charging level • System performance and userinterface greatly improved • ZXCT1012 key features • 3.5µA IQ • Thin small footprint packages • TSOT23-5 or TDFN3x3-5 Mobile phone handset RSENSE 2.7 to 4.2V ZXCT1012 Handset battery + - VOUT

  5. Typical Mobile Phone Charging Circuit External Supply Power Management IC Main Battery Circuit demand on transistor • Using Zetex PNP can eliminate need for a series connected Schottky diode for reverse blocking • SOT23F, SOT23-6 or MLP packaging to meet Pd at low battery condition • Low Saturation voltage to enable lower input voltage Main Circuit “Smallest, high dissipation switches”

  6. Transistor Package Comparison

  7. Fits on same pcb footprint as SOT23 3mm x 2.5mm Low profile package Max height 1mm High power dissipation 1.3W (25 x 25mm, 2 oz copper) 1.5W (50 x 50mm, 2 oz copper) 2W (50 x 50mm, 2 oz copper, t ≤ 5secs) SOT23F (flat) package --------- New Package Introduction 1mm 2.5mm 3mm

  8. PNP Transistors and Schottky for Battery Charging Circuit * Dual device for phones with adaptor plus USB charging

  9. Power Management

  10. 150mA LDOs in SC70-5 and SOT23-5 The ZXCL range of low dropout regulators are inherently stable with tantalum and ceramic capacitor values  1µF. Low output noise (50µVRMS) and good PSRR (56dB) is achieved without the need for additional bypass capacitors. 1.5V and 1.8V variants can be made available.

  11. RF Power Amplifier

  12. MOSFETs and Schottky for within the RF Power Amplifier Advance Info Advance Info

  13. LCD Display & Backlighting

  14. Zetex LED driver ICs Designed specifically to drive white LEDs for a wide range of existing and emerging applications, Zetex LED driver solutions provide high efficiency, cost effectiveness and versatility. Key features: • Programmable LED current • <5µA shutdown current • High efficiency: 94% • Low 100mV feedback voltage for high efficiency • Series, parallel and series parallel connection combinations • Complementary external switches and Schottky diodes Key Existing Products: • ZXLD11xx / 19xx series

  15. Boost converters for LCD / OLED bias These boost converters provide an adjustable bias voltage of up to 28V for LCD and OLED displays. Key features: • Adjustable output voltage up to 28V • Wide input voltage range: 1.6V to 5.5V (ZXLB16xx series) • <1µA typical shutdown current (ZXLD16xx series) • 85% efficiency (ZXLB1600) / 80% (ZXLD16xx series) • PWM & analog control input (ZXLD16xx series) • True shutdown with output isolated from supply (ZXLB16xx series) Key products: • ZXLB16xx series (MSOP-10 Package) • ZXLD16xx series (TSOT23-5 and SC70-6 Package)

  16. Boost converters for LCD / OLED bias Typical Application Circuit; ZXLD1601 Typical Application Circuit; ZXLD1615 Typical Application Circuit; ZXLB1600 ZXLD1601/1615

  17. Photo Flash

  18. Photoflash charger ICs The ZXSC44x series have a flyback efficiency of 75%, much higher than commonly used discrete charging circuits. Key features: • Dedicated photoflash charger ICs • Charges 80µF to 300V in 3.5 sec from 3V supply • Operates from 1.8V to 8V supply • >75% flyback efficiency • Idle current: only 4.5µA when cap is charged • Total solution: control IC, bipolar transistor or MOSFET and Schottky diode • Small MSOP8 package Key products: • ZXSC44x series • Key applications: • Digital camera flash unit • Film camera flash unit • Rescue / safety flash strobe

  19. Photoflash charger ICs – ZXSC440

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