Texas Instruments TPS61061DRBR, DC DC Regulator, Step-Up (Boost), 1MHz, PWM Dimming, 400mA Switch, 8-VDFN Exposed Pad, -40°C~85°C.
| Parameter | Value |
|---|---|
| Type | DC DC Regulator |
| Mounting | Surface Mount |
| Voltage - output | 18.5V |
| Voltage | 2.7V |
| Current - output (Channel) | 400mA (Switch) |
| Frequency | 1MHz |
| I/O channels | 1 |
| Operating temperature | -40°C~85°C(TA) |
| Dimming | PWM |
| Package | Tape & Reel (TR); Cut Tape (CT) |
| Topology | Step-Up (Boost) |
| Applications | Backlight |
| Case | 8-VDFN Exposed Pad |
| Internal switch | Yes |
The 400 mA switch current is the peak current the internal NMOS switch can handle, not the average LED current. For a typical boost converter, the average LED current is lower than the switch peak by a factor that depends on input voltage, output voltage, and inductor ripple.
For new designs, this part is a safe choice with no imminent obsolescence risk.
Yes, the TPS61061DRBR supports PWM dimming. A logic-level PWM signal controls the output brightness directly from a microcontroller GPIO.
The internal switch is rated for 400 mA peak current. The achievable average LED current depends on input voltage, output voltage, and inductor selection; expect approximately 80–100 mA for a typical 3-LED string at 18.5 V from a 3.6 V input.
A close functional equivalent is the LM2703MF-ADJ/NOPB from Texas Instruments, also a step-up DC-DC regulator for backlighting with PWM dimming. The LM2703 has a 350 mA switch current (vs 400 mA), operates from 2.2 V minimum input, and is rated to 125°C junction temperature. Pin compatibility should be verified against the respective datasheets before substitution.
Yes, as a DC-DC regulator it requires an external inductor, input and output capacitors, and feedback resistors to set the output voltage. The internal switch and compensation are integrated, but the inductor and capacitors are not.