NJU8754KM1

Common Mode Rejection Ratio (Min) :
Operating Supply Voltage :
Mounting Style : SMD/SMT
Packaging : Reel
Product : Class-D
Maximum Operating Temperature : + 85 C
THD plus Noise : 0.05 %
Output Type : 1-Channel Mono
Supply Current : 4 mA
Package / Case : QFN-20
Output Power : 1.2 W
Available Set Gain : 23 dB
Maximum Power Dissipation : 620 mW


Features:

·Monaural Analog Signal Input
·Monaural BTL Output :1.2W at 5V into 8Ohms
                                     :0.6W at 3.6V into 8Ohms
·Standby(Hi-Z), Mute Control
·Built-in Short Protector
·Built-in Low Voltage Detector
·Operating Voltage :2.7 ~ 5.25V
·CMOS Technology
·Package Outline :SSOP10, QFN20

Pinout




Specifications

PARAMETER	SYMBOL	RATING	UNIT
Supply Voltage	VDD VDDO	-0.3 ~ +5.5 -0.3 ~ +5.5	V V
Input Voltage	Vin	-0.3 ~ VDD+0.3	V
Operating Temperature	Topr	-40 ~ +85	°C
Storage Temperature	Tstg	-40 ~ +125	°C
Power Dissipation	PD	250 (SSOP10) TBD(QFN20)	mW

Note 1) All voltage are relative to "VSS= 0V" reference.
Note 2) The LSI must be used inside of the "Absolute maximum ratings". Otherwise, a stress may cause permanent damage to the LSI.
Note 3) De-coupling capacitors for VDD-VSS and VDDO-VSS should be connected for stable operation.
Note 4) Power Dissipation
The class-D amplifiers are more power efficient, and dissipate power less than general analog-amplifiers. In theory, the NJU8754 actualize quite high output-power such as 1.2W at =5V operation with 8ohms load, it looks as if the NJU8754 exceeds the absolute maximum rating of the power dissipation. However, in practice, the effective output-power of usual music sound is only about 1/10 of its
maximum output power, thus it may never exceed the absolute maximum rating.
The maximum power dissipation in the system is calculated, as shown below. Pdmax(W) = (Tjmax(°C) - Ta(°C)) /ja
Pdmax: Maximum Power Dissipation, Tjmax: Junction Temperature = 125°C
Ta: Ambient Temperature, ja: Thermal Resistance of package(SSOP10) = 400°C/W
Power dissipation of the NJU8754 itself is calculated, as shown below.
Pd(W) = PO(W) X RO(Ω) / RL(Ω) + PdIC(W)
Pd: Power Dissipation, PO: Output Power, RO: Internal Resistance(output driver)
RL: Load Resistance, PdIC: Power of internal circuit

Description

The NJU8754 is an analog signal input monaural class D power amplifier. The NJU8754 includes Inversion operatinal amplifier input circuit, PWM modulator, an output-short protector and a low voltage detector. The NJU8754 incorporates BTL amplifier, which eliminate AC coupling capacitors, capable of driving up to 0.6W at 3.6V supply voltage with simple external LC low-pass filters.

The NJU8754 features high power-efficiency by class-D operation and very small package, and is suited for cellular phone, PDA, etc.