Overview

The TDA7052 is a 1W mono Bridge-Tied Load (BTL) audio power amplifier IC manufactured by NXP Semiconductors (originally Philips). Designed specifically for battery-operated portable equipment (such as handheld radios, walkie-talkies, small battery speakers, and microcontroller voice prompts), it operates over a supply range of 3.0V to 18.0V DC.

Utilizing a Bridge-Tied Load (BTL) output architecture, the speaker is connected differentially between two internal output amplifiers (OUT1 and OUT2). This quadruples the output power compared to a single-ended amplifier at the same supply voltage and eliminates the large output DC-blocking capacitor, dramatically reducing PCB component count and physical size.

Quick reference

Amplifier TypeMono Bridge-Tied Load (BTL) Audio Amplifier
Output Power1.2 WRMS1.2\text{ W}_{\text{RMS}} into 8 Ω8\ \Omega load at VP=6.0VV_P = 6.0\text{V} (2.0W2.0\text{W} into 8 Ω8\ \Omega at 9.0V9.0\text{V})
Supply Voltage (VP)3.0 V to 18.0 V DC (Optimal battery supply 6.0V6.0\text{V})
Quiescent Current4.0 mA4.0\text{ mA} typical (Ultra-low standby battery drain)
Fixed Voltage Gain39 dB39\text{ dB} (Internal fixed gain — no external feedback resistors required)
External Capacitor RequirementNO output coupling capacitors needed
Package8-pin DIP / SOIC-8

Pinout (DIP-8 Package)

text
             ┌───┴───┐
        VP  1│ 1   8 │ GND3
      OUT1  2│       │ 7 OUT2
      GND1  3│TDA7052│ 6 NC
       IN+  4│       │ 5 GND2
             └───────┘
PinNameTypeDescription
1VPPowerPositive DC Power Supply (+3.0V to +18.0V DC)
2OUT1OutputPositive BTL Speaker Output (+)
3GND1PowerGround Reference
4IN+InputAudio Signal Input
5GND2PowerGround Reference
6NCUnusedNo Internal Connection
7OUT2OutputNegative BTL Speaker Output (-)
8GND3PowerGround Reference

Minimal 6V Battery Application Circuit

text
  Audio Input ───[ 0.47µF Film Cap ]───► [Pin 4: IN+]
                                           TDA7052
  +6V DC Battery ──────────────────────► [Pin 1: VP]
  Battery GND ─────────────────────────► [Pins 3, 5, 8: GND]

  [Pin 2: OUT1] ───────────────────────► ( + ) $8\ \Omega$ Speaker
  [Pin 7: OUT2] ───────────────────────► ( - ) $8\ \Omega$ Speaker

Common mistakes

  • Connecting BTL speaker outputs (OUT1 or OUT2) to Ground: Because the speaker is driven differentially across OUT1 and OUT2 (both resting at VP/2V_P / 2), grounding either terminal creates an immediate DC short-circuit that damages the IC.
  • Connecting a headphone jack with shared ground: Headphone jacks share a common ground terminal between left and right channels. BTL outputs cannot drive shared-ground headphones directly.

Notes

  • TDA7052 vs TDA7052A: TDA7052 has a fixed 39 dB39\text{ dB} gain; TDA7052A includes an internal DC-voltage controlled volume control circuit on Pin 4 (0V…1.4V0\text{V} \dots 1.4\text{V} volume adjustment).

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