High Efficiency 2-Channel LED Backlight Driver
Description
KTD3133 is the ideal power solution for LED backlighting in medium to large size LCD panels. It is a highly integrated step-up DC-DC converter operating with an input voltage from 2.7V to 5.5V, accommodating 1-cell lithium ion batteries or 5V supply. It includes a high voltage power NMOS, as well as two current sinks, resulting in a simpler and smaller solution with fewer external components. High switching frequency allows the use of a smaller inductor and capacitor.
Each of the two regulated current sinks can regulate up to 29.8mA in backlight mode. With a maximum of 32V at the output of the step-up converter, each string can connect up to 8-LED in series for a 16-LED application.
KTD3133 is equipped with I2C interface for various controls. For additional flexibility, PWM dimming with a wide range frequency and duty cycle is included to support Content Adaptive Brightness Control (CABC).
Various protection features are built into KTD3133, including cycle-by-cycle inductor current limit protection, output over-voltage protection, LED fault (open or short) protection, and thermal shutdown protection.
KTD3133 is available in a RoHS-compliant 12-ball 1.19mm x 1.64mm WLCSP or a 16-lead 3mm x 3mm x 0.75mm Thin-QFN package.
Features
- Wide input range: 2.7V ~5.5V
- High efficiency step-up 2-Channel LED driver
- 2-Ch current sinks, up to 8-LEDs per string
- Up to 29.8mA/Ch in backlight mode
- +/-0.6% current matching at 20.2mA
- +/-1.5% current accuracy at 20.2mA
- I2C/PWM dual dimming control scheme
- 11-bit I2C exponential or linear mapping with programmable transition ramp time
- Wide range PWM dimming with programable transition ramp time
- 100Hz to 100kHz frequency
- 2% to 100% duty cycle at 20kHz
- Programmable current sink turn on/off ramp time and shape
- Selectable boost converter switching frequency 1MHz or 500kHz with 20% shift up option
- Programmable input PWM hysteresis to minimize jitter at low PWM duty cycle
- Programmable OVP (25.9V/32V) and current limit (1.8A/2.6A)
- LED open/short protection
- Status reporting through I2C interface
Applications
- Smartphone/Tablet Backlight
Packaging Information
| Package | Dimensions | Bumps | Package Code |
| TQFN33-16 | 3.00mm x 3.00mm x 0.75mm | 16 | FJ |
| WLCSP34-12 | 1.19mm x 1.64mm x 0.62mm | 12 | US |
Parameters
| Vin (min) | Vin (max) | Number of LEDs/ Channels | LED Channels | Total Number of LEDs | Brightness Control | Switching Frequency (MHz) | Current per Channel (Max) | Output OVP |
| 2.7V | 5.5V | 8 | 2 | 16 | I2C and/or PWM | 1.0/0.5 | 29.8mA | 25.9V/32V |
Technical Documentation
| Description | Documents | Type |
|---|---|---|
| Datasheet | KTD3133-04b | |
| Package Outline Drawing | TQFN33-16 FJ POD |
Purchase
| Purchase Options |
|---|
| Buy from Digi-Key |
| Buy from Mouser |