TPS61177A WLED Driver for Notebook and Tablet Display |

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WLED Driver for Notebook and Tablet Display



The TPS61177A device provides a highly integrated white LED (WLED) driver solution for notebook LCD backlight. This device has a built-in high-efficiency boost regulator with integrated 1.8-A, 40-V power MOSFET. The six current sink regulators provide high precision current regulation and matching. In total, the device can support up to 72 WLEDs. In addition, the boost output automatically adjusts its voltage to the WLED forward voltage to optimize efficiency.

The TPS61177A supports the analog dimming, analog and PWM dimming, and direct PWM dimming method. During analog dimming mode, each CS current linearly varies depending on the duty cycle information on the PWMB pin. During analog and PWM mixed dimming mode, the input PWM duty cycle information is translated to an analog signal to control the WLED current linearly over 25% to 100% brightness area. The device also allows adding PWM dimming when the analog current is down to 25%. Below 25%, the analog signal translates to PWM duty cycle information to control the on or off of WLED current and averages the WLED current down to 1%. The frequency of adding PWM dimming is same to input PWM frequency on the PWMB pin. While the TPS61177A also supports a direct PWM dimming method, in direct PWM dimming mode the WLED current is turned on or off, synchronized with the input PWM signal.


  • 2.5-V to 24-V Input Voltage Range
  • 39-V Maximum Output Voltage
  • Integrated 1.8-A, 40-V MOSFET
  • 450-kHz to 1.2-MHz Programmable Switching Frequency
  • Adaptive Boost Output to WLED Voltages
  • 100-Hz to 25-kHz Wide Input PWM Dimming Frequency Range
  • 1% Minimum Dimming Duty Cycle
  • Small External Components
  • Integrated Loop Compensation
  • Six Current Sinks of 30 mA Maximum
  • 1% (Typical) Current Matching
  • Input PWM Glitch Filter
  • PWM Brightness Interface Control
  • Three Optional Dimming Methods, including Direct PWM Dimming, Analog Dimming, and Analog and PWM Mixed Dimming
  • Built-in WLED Open Protection
  • Thermal Shutdown

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Part number Order Channels (#) Vin (Min) (V) Vin (Max) (V) Vout (Min) (V) Vout (Max) (V) Switching frequency (Max) (kHz) Type LED current per channel (mA) LED (#) Topology Shutdown current (Typ) (uA) Peak efficiency (%) LED configuration Function Features Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
TPS61177A Order now 6     2.5     24     4.5     39     1200     Inductive     30     60     Boost     5     95     Dual
  Analog Dimming
Analog/PWM Mixed Dimming
Direct PWM Dimming    
-40 to 85     VQFN | 20     20VQFN: 12 mm2: 3.5 x 3.5 (VQFN | 20)    
LP8553 Order now 4     2.7     22     10     40     1250     Inductive     50     40     Boost     1     93         PWM Control     -30 to 85     DSBGA | 25     25DSBGA: 8 mm2: 2.8 x 3 (DSBGA | 25)    
LP8555 Order now 12     2.7     20     7     28     1000     Inductive     50     96     Boost     3     93     6 LED channels
Backlight     Adjustable Switch Frequency
Analog/PWM Mixed Dimming
Edge Rate Control
I2C Control
Integrated Switch
PWM Control
Thermal Shutdown    
-40 to 85     DSBGA | 36     See datasheet (DSBGA)    
LP8556 Order now 6     2.7     20     7     48     1250     Inductive     50     60     Boost     0.1     95     Parallel       I2C Control     -30 to 85     DSBGA | 20
WQFN | 24    
See datasheet (DSBGA)
24WQFN: 16 mm2: 4 x 4 (WQFN | 24)    
LP8557 Order now 6     2.7     5.5     7     28     1000     Inductive     25     48     Boost     0.001     93     6 LED channels