2A WLED driver for notebooks with PWM control interface
Product details
Parameters
Package | Pins | Size
Features
- 4.2 V to 24 V Input Voltage
- Integrated 2 A/40 V MOSFET
- 600 kHz to 2 MHz Programmable Switching Frequency
- Adaptive Boost Output for Best Efficiency
- Design to Use Small L-C Components
- Integrated Loop Compensation
- Eight 25 mA Current Sinks
- Up to 10 WLED in Series
- 1% Current Matching and Accuracy
- PWM Brightness Interface Control
- 200 mV Ripple Under PWM Dimming
- Driver for Input/Output Isolation PFET
- Programmable Over Voltage Threshold
- 100 Hz to 5 kHz Programmable PWM Dimming Frequency
- Up to 20 kHz Direct PWM Dimming Frequency
- Enhanced Electrostatic Discharge Immunity Level
- Built-in WLED Open/Short Protection
- Over Temperature Protection
- 24 Pin 4 mm × 4 mm QFN Package
- APPLICATIONS
- Notebook LCD Display Backlight
Description
The TPS61185 IC provides highly integrated solutions for large-size LCD backlighting. This device has a built-in high efficiency boost regulator with integrated 2 A/40 V power MOSFET. The eight current sink regulators provide high precision current regulation and matching. In total, the device can support up to 80 LEDs. In addition, the boost output automatically adjusts its voltage to the WLED forward voltage to improve efficiency.
The TPS61185 supports the PWM method for brightness dimming. Simply tie the unused current sinks to ground if fewer than eight are needed. During PWM dimming, each of the eight current regulators is turned on/off at the duty cycle determined by an external pulse width modulation (PWM) signal input to the PWM pin. The frequency at which each current regulator turns on/off follows the input PWM signal on the PWMIN pin if the MODE pin is grounded. If the MODE pin is left floating or tied high, the regulators turn on/off at the frequency programmed by an external resistor on the FPWMO pin.
The TPS61185 IC supports boost switch frequency programming from 600kHz to 2MHz by an external resistor on the FSW pin. The device also provides a driver output for an optional external PFET connected between the input and inductor for truly disconnecting the battery from LED during the shutdown or fault protection. The device integrates resistor programmable over-voltage protection, soft-start, and thermal shutdown.
The TPS61185 IC has a built-in linear regulator to power the internal circuits of the IC. The device is in a 4 mm × 4 mm QFN package.
Technical documentation
| Type | Title | Date | |
|---|---|---|---|
| * | Datasheet | WLED Driver for Notebooks with PWM Control Interface datasheet (Rev. A) | May 18, 2010 |
| White paper | Common LED Functions and LED Driver Design Considerations | Sep. 21, 2020 | |
| Technical article | Overcoming challenges for backlight LED drivers in automotive display solutions | Jul. 16, 2020 | |
| Application note | Some Guidelines and Tips for the LED Driver Application | Aug. 14, 2019 | |
| Application note | Performing Accurate PFM Mode Efficiency Measurements (Rev. A) | Dec. 11, 2018 | |
| Selection guide | Power Management Guide 2018 (Rev. R) | Jun. 25, 2018 | |
| Technical article | Here's how body electronics and lighting technology are changing the driving experience | Sep. 26, 2016 | |
| Technical article | LED brightness adjustment: high-frequency PWM dimming | Aug. 26, 2016 | |
| Technical article | Take better selfies with innovative LED flashes | Nov. 18, 2014 | |
| User guide | TPS61185EVM-335 | May 25, 2010 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
Description
Features
- 4.2V to 24V input voltage
- Integrated 2A 40V MOSFET
- 600KHz to 2MHz programmable switching frequency
- Adaptive Boost Output for Best Efficiency
- Design to Use Small L-C Components
- Integrated loop compensation
- Eight 25mA Current Sinks
- Up to 10 WLED in series
- 1% current matching and accuracy
- PWM brightness (...)
Design tools & simulation
Features
- Leverages Cadence PSpice Technology
- Preinstalled library with a suite of digital models to enable worst-case timing analysis
- Dynamic updates ensure you have access to most current device models
- Optimized for simulation speed without loss of accuracy
- Supports simultaneous analysis of multiple products
- (...)
CAD/CAE symbols
| Package | Pins | Download |
|---|---|---|
| VQFN (RGE) | 24 | View options |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
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