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HT8699
2×5.5W Stereo Audio Amplifier with Boost Converter

HT8699 integrates a boost converter with a filter-less stereo class D audio power amplifier to provide 2×5.5W continuous power into a 4Ω speaker when operating from a Li-battery voltage boosted to 7V. Meanwhile, the boost output voltage is adjustable.

Class AB amplifier mode is also available for HT8699. Once the EMI Interference from class D and Boost Converter becomes an annoying problem, HT8699 can be switched into Class AB mode.

HT8699 has a filter-less modulation circuit which directly drives speakers while realizes low distortion and low noise characteristics. Thanks to filter-less, circuit design with fewer external parts can be made in portable applications.

HT8699 has the independent Shutdown function which can minimize the power consumption at standby and MUTE function. As for protection function, over current protection, over temperature protection function, and low supply voltage malfunction preventing function are also prepared.


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FEATURE

  • Pb-Free Packages，SOP16L-PP

  • Anti-Clipping Function (ACF)

  • Filter-less Modulation, Eliminating Output Filter

  • Output Power

    2×5.5W(VBAT=4V, PVDD = 7V, RL=4Ω, THD+N=10%)

  • BOOST Input VBAT：2.5V to 5.5V
    -BOOST Output PVDD：VBAT to 7.5V

  • Adjustable BOOST Output Voltage

  • Class AB /Class D available

  • Thermal Protection, Over current protection, Low voltage malfunction prevention function included

APPLICATIONS

  • Bluetooth Speakers        

  • Portable Speakers

  • iPhone/iPod/iPod docking    

  • Megaphone


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TERMINAL FUNCTION

Terminal No.

Name

I/O

ESD

Protection

Function

0

GND

GND

-

Power Ground. Do connect to the system Ground.

1

INL+

I

PN

Left channel positive input (differential +)

2

INL-

I

PN

Left channel negative input (differential -)

3

CTRL

I

PN

Shutdown and ACF control terminal

4

VBAT

Power

PN

Logic Power Supply

5

FB

I

PN

Regulator Feedback Input

6,7

LX

I

-

Internal Switch Input

8

NC



No connection. Connect to GND for better thermal performance

9

PVDDR

Power

-

Boost Converter Output Voltage, Power Supply for Class D Right Channel

10

OUTR-

O

-

Right channel negative output (BTL-)

11

OUTR+

O


Right channel positive output (BTL+)

12

INR+

I

PN

Right channel positive input (differential +)

13

INR-

I

PN

Right channel negative input (differential -)

14

PVDDL

Power

-

Boost Converter Output Voltage, Power Supply for Class D Left Channel

15

OUTL-

O

-

Left channel negative output (BTL-)

16

OUTL+

O


Left channel positive output (BTL+)

 I: Input   O: Output