TOSHIBA Bi-CMOS Digital Integrated Circuit Silicon Monolithic
Class KB High-Efficiency, Low-Frequency Power Amplifier IC
Maximum Power: 47 W × 4 Channels
The TB2905HQ is a high-efficiency class KB power amplifier
IC developed for car audio applications that incorporates four
BTL amplifier channels.
It employs a pure complementary DMOS output stage
www.DataSheetc4oUn.csoismting of P-ch upper and N-ch lower sections, offering a
maximum output power (POUT) of 47 W.
Class KB (keyed BTL) amplifiers exhibit less than half the
heat generation of comparable class AB solutions under normal
operating conditions. Therefore, it is possible to design a smaller
heatsink and maintain lower internal temperature in the car
Weight: 7.7 g (typ.)
Additionally, the TB2905HQ has many built-in functions for car audio, such as standby switching, muting,
protective circuits, and self diagnosis.
• High output power
: POUT MAX (1) = 47 W (typ.)
(VCC = 14.4 V, f = 1 kHz, JEITA max, RL = 4 Ω)
: POUT MAX (2) = 43 W (typ.)
(VCC = 13.7 V, f = 1 kHz, JEITA max, RL = 4 Ω)
: POUT Pout MAX (3) = 80 W (typ.)
(VCC = 14.4V, f = 1 kHz, JEITA max, RL = 2 Ω)
: POUT (1) = 29 W (typ.)
(VCC = 14.4 V, f = 1 kHz, THD = 10%, RL = 4 Ω)
: POUT (2) = 25 W (typ.)
(VCC = 13.2 V, f = 1 kHz, THD = 10%, RL = 4 Ω)
: POUT (3) = 55 W (typ.)
(VCC = 14.4 V, f = 1 kHz, THD = 10%,RL = 2 Ω)
• Low distortion ratio
: THD = 0.03% (typ.)
(VCC = 13.2 V, f = 1 kHz, GV = 26dB, POUT = 2 W, RL = 4 Ω)
• Low noise
: VNO = 120 µVrms (typ.)
(VCC = 13.2 V, GV = 26dB, Rg = 0 Ω, BW = 20 Hz~20 kHz, RL = 4 Ω)
• Built-in standby (pin 4) and muting (pin22) functions
• Built-in offset/clipping detection (pin 25)
• Protective circuits: Thermal shutdown, overvoltage, out to GND, out to VCC, out to out short
• Operating supply voltage: VCC (opr) = 9 to 18 V (RL = 4 Ω)
Note 1: Some pins of this product are sensitive to electrostatic discharge. When handling this product, ensure that
the environment is protected against electrostatic discharge.
Note 2: Install the product correctly. Otherwise, the product or connected equipment may get damaged or degrade.
These protective features are intended to temporarily prevent an output short circuit or other abnormal
conditions from occurring. Toshiba does not guarantee that they prevent the IC from being damaged.
If the product is operating outside any of the guaranteed operating ranges, these protective features may
not operate and an output short circuit may result in the IC being damaged.