General description
The TDF8599B is a dual Bridge-Tied Load (BTL) car audio amplifier comprising an
NDMOST-NDMOST output stage based on SOI BCDMOS technology. Low power
dissipation enables the TDF8599B high-efficiency, class-D amplifier to be used with a
smaller heat sink than those normally used with standard class-AB amplifiers.
The TDF8599B can operate in either non-I2C-bus mode or I2C-bus mode. When in I2Cbus
mode, DC load detection results and fault conditions can be easily read back from
the device. Up to 15 I2C-bus addresses can be selected depending on the value of the
external resistor connected to pins ADS and MOD.
When pin ADS is short circuited to ground, the TDF8599B operates in non-I2C-bus mode.
Switching between Operating mode and Mute mode in non-I2C-bus mode is only possible using pins EN and SEL_MUTE.

Features
• High-efficiency
• Low quiescent current
• Operating voltage from 8 V to 24 V
• Two 4 Ω/2 Ω capable BTL channels or one 1 Ω capable BTL channel
• Differential inputs
• I2C-bus mode with 15 I2C-bus addresses or non-I2C-bus mode operation
• Clip detect
• Independent short circuit protection for each channel
• Advanced short circuit protection for load, GND and supply
• Load dump protection
• Thermal foldback and thermal protection
• DC offset protection
• Selectable AD or BD modulation
• Parallel channel mode for high-current drive capability
• Advanced clocking:
– Switchable oscillator clock source: internal for Master mode or external for Slave
mode
– Spread spectrum mode
– Phase staggering
– Frequency hopping
• No ‘pop noise’ caused by DC output offset voltage
• I2C-bus mode:
– DC load detection
– AC load detection
– Thermal pre-warning diagnostic level setting
– Identification of activated protections or warnings
– Selectable diagnostic information available using pins DIAG and CLIP
• Qualified in accordance with AEC-Q100