UTC M4670G-K08-3030-R Fiterless high efficiency 3w switching audio amplifier Datasheet

UNISONIC TECHNOLOGIES CO., LTD
M4670
Preliminary
CMOS IC
FITERLESS HIGH EFFICIENCY
3W SWITCHING AUDIO
AMPLIFIER

DESCRIPTION
The M4670 is a fully integrated single-supply, high-efficiency
Class D switching audio amplifier, and it can provide 3W of output
power. Containing adjustable output gain chip with micro-power
shutdown mode, the M4670 has innovative modulation schemes
that eliminate the output filter wave devices and thus reduces the
requirement of external components helping to streamline the circuit
design and reduce board area.
By using delta-sigma modulation technique which handles
incoming analog signal, the M4670 can reduce the output noise and
total harmonic distortion.
Operating on a single 5V supply, the M4670 can be a continuous
average output of 2.3W of power to driver the 4Ω speaker, and the
total harmonic distortion and noise (THD+N) are less than 1%. High
power conversion efficiency of the M4670 can drive a larger load
speaker that is respectively comparable to the typical Class AB
amplifier. Its can be used with a 3.6V, 600mW power supply to
driver an 8Ω speaker, while the efficiency is as high as 88%.
The M4670 has a high output power characteristics that makes it
ideal for ultra-high-power walkie-talkies, mobile phones, hands-free
intercom systems and applications.

FEATURES
* Externally Configurable Gain
* No Output Filter Required for Inductive Loads
* Very Fast Turn on Time: 1.05ms (Typical)
* ‘Click and Pop’ Suppression Circuitry
* Micro-Power Shutdown Mode
* Short Circuit Protection

ORDERING INFORMATION
Ordering Number
M4670G-K08-3030-R
www.unisonic.com.tw
Copyright © 2015 Unisonic Technologies Co., Ltd
Package
DFN-8(3×3)
Packing
Tape Reel
1 of 8
QW-R502-442.d
M4670
Preliminary

MARKING

PIN CONFIGURATIONS

SHUTDOWN
1
8
VOUT 2
-IN
2
7
VDD
+IN
3
6
GND
GND
4
5
VOUT 1
PIN DESCRIPTION
PIN NO
1
2
3
4, 6
5
7
8

CMOS IC
PIN NAME
SHUTDOWN
-IN
+IN
GND
VOUT1
VDD
VOUT2
PIN TYPE
I
I
I
I
O
I
O
PIN DESCRIPTION
Enable input
Negative signal input
Positive signal input
Ground pin
Output voltage pin
Power supply input for internal circuitry
Output voltage pin
BLOCK DIAGRAM
VDD
SHUTDOWN
Bias
Circuit
Internal
OSC
Click
Pop/Suppression
-IN
VOUT1
Amplifier
ΔΣ Modulation
+IN
FET Drivers
VOUT2
GND
GND
Fig. 1 Interior Configuration Circuit
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2 of 8
QW-R502-442.d
M4670

Preliminary
CMOS IC
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VDD
6
V
Voltage at any input pin
GND-0.3~VDD+0.3
V
Junction Temperature
TJ
150
°C
Storage Temperature
TSTG
-65 ~ +150
°C
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.

RECOMMENDED OPERATING CONDITIONS (Note)
PARAMETER
SYMBOL
RATINGS
Supply Voltage
VDD
2.4 ~ 5.5
Ambient Operating Temperature
TOPR
-40 ~ +85
Note: All voltage values are with respect to the network ground terminal unless otherwise noted.

THERMAL DATA
PARAMETER
Junction to Ambient

UNIT
V
°C
SYMBOL
θJA
RATINGS
220
UNIT
°C/W
ELECTRICAL CHARACTERISTICS
(The following specifications apply for AV=2V/V (RIN=150KΩ), RL = 15μH+8Ω+15μH, limits apply for TA=25°C, unless
otherwise specified.)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX UNIT
Differential Output Offset Voltage
| VOS | VIN =0, Av=2V/V,VDD=2.4V to 5.0V
25
mV
GMS Power Supply Rejection Ratio PSRRGSM VDD=2.4V to 5.0V, Input Referred
64
dB
VDD=2.4V to 5.0V
VIC=VDD/2 to 0.5V
GMS Common Mode Rejection
CMRRGSM
80
dB
Ratio
VIC=VDD/2 to VDD-0.8V
Input Referred
Logic High Input Current
IIH
VDD = 5.0V,VIN = 5.8V
20
100
μA
Logic Low Input Current
IIL
VDD = 5.0V,VIN = -0.3V
1
5
μA
7.0
10
VDD = 5.0V,VIN = 0V, No Load
mA
Quiescent Power Supply Current
IDD
VDD = 3.6V,VIN = 0V , No Load
4.8
VDD = 2.4V,VIN = 0V
3.8
5
Shutdown Current
ISD
VSHUTDOWN = 0 V, VDD = 2.4V ~ 5V
0.01
1
μA
Shutdown voltage input high
VSDIH
1.4
V
Shutdown voltage input low
VSDIL
0.4
V
Output Impedance
ROSD
VSHUTDOWN = 0.4 V
>100
KΩ
270
300
330
Gain
AV
V/V
KΩ/RI KΩ/RI KΩ/RI
Resistance from Shutdown pin to GND
RSD
300
KΩ
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
3 of 8
QW-R502-442.d
M4670

Preliminary
CMOS IC
ELECTRICAL CHARACTERISTICS (Cont.)
PARAMETER
SYMBOL
TEST CONDITIONS
VDD=5V
VDD=3.6V
VDD=2.5V
VDD=5V
RL=15μH+4Ω+15μH
THD=1% (max)
VDD=3.6V
f=1KHz, 22KHz BW
VDD=2.5V
Po
VDD=5V
RL=15μH+8Ω+15μH
THD=10% (max)
VDD=3.6V
f=1KHz, 22KHz BW
VDD=2.5V
VDD=5V
RL=15μH+8Ω+15μH
THD=1% (max)
VDD=3.6V
f=1KHz, 22KHz BW
VDD=2.5V
VDD=5V,PO=1 WRMS, f=1KHz
VDD=3.6V,PO=0.5 WRMS, f=1KHz
THD+N
VDD=3.6V,PO=0.5 WRMS, f=5KHz
VDD=3.6V,PO=0.5 WRMS, f=10KHz
VDD=3.6V, VRIPPLE=200mVpp Sine,
fRIPPLE=217Hz, Input to AC GND,
CI=0.1μ, Input Referred
VDD=3.6V, VRIPPLE=200mVPP Sine,
PSRR fRIPPLE=1KHz, Input to AC GND,
CIN=0.1μF, Input Referred
VDD=3.6V, VRIPPLE=200mVpp Sine,
fRIPPLE=217Hz, fIN=1KHz,
Po=10m WRMS, Input Referred
SNR VDD=5V, Po=1 WRMS
VDD=3.6V,f = 20Hz-20KHz
Inputs to AC GND,CIN=0.1μF,
OUT No Weighting, Input Referred
VDD=3.6V, Inputs to AC GND,
CIN=0.1μF, A Weighted
Input Referred
VDD=3.6V, VRIPPLE=1VPP Sine
CMRR
fRIPPLE=217Hz,Input Referred
TWU VDD=3.6V
TSD
VDD=3.6V
MIN
RL=15μH+4Ω+15μH
THD=10% (max)
f=1KHz, 22KHz BW
Output Power
Total Harmonic Distortion + Noise
Power Supply Rejection Ratio
Signal to Noise Ratio
Output Noise
Common Mode Rejection Ratio
Wake-up Time
Shutdown Time
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
600
TYP
3.0
1.5
675
2.3
1.2
550
1.65
850
400
1.35
680
325
0.35
0.30
0.30
0.30
MAX
UNIT
W
W
mW
W
W
mW
W
mW
mW
W
mW
mW
%
68
65
dB
62
93
dB
85
μVRMS
65
80
dB
1.35
0.01
ms
ms
4 of 8
QW-R502-442.d
M4670

Preliminary
CMOS IC
APPLICATION INFORMATION
GENERAL AMPLIFIER FUNCTION
The M4670 output signal consists of two, BTL connected, of course, the output signal can also be a pulse signal,
the minimum width of each pulse is approximately 350ns. The two outputs can pulse independently exception that
they both may never pulse simultaneously as this would result in zero volts across the BTL load. But in the same row
of as the output pulse occurred in this case, they are connected together, as a broader pulse, to achieve an effective
100% duty cycle occurs. For a given supply voltage and load impedance, the maximum audio output power effects.
The M4670 chip can achieve much high efficiencies than the class AB amplifier, while maintaining acceptable THD
performance.
The short driver pulse output means, a good efficiency can be issued with the M4670 inductive load. For the
typical sensor load audio amplifier is a very passive. To this end, the load can act as its own filter.
POWER DISSIPATION AND EFFICIENCY
In general, efficiency is considered useful in the work required to produce a different power dissipated in the
integrated circuit usually it is divided by the total energy output ratio. For audio systems, the energy delivered in the
audible bands is considered useful including the distortion products of the input signal. Sub-sonic (DC) and
super-sonic components (>22kHz) are not useful. The difference between the power flowing from the power supply
and the audio band power being transduced is dissipated in the M4670 and in the transducer load. The amount of
power dissipation in the M4670 is very low. This is because the on resistance of the switches used to form the output
waveforms is typically less than 0.25Ω. This leaves only the transducer load as a potential "sink" for the small excess
of input power over audio band output power. The M4670 dissipates only a fraction of the excess power requiring no
additional PCB area or copper plane to act as a heat sink.
DIFFERENTIAL AMPLIFIER EXPLANATION
The M4670 is a fully differential amplifier with differential input and output stages. A differential amplifier
amplifies the difference between the two input signals. Traditional audio power amplifiers have typically offered only
single-ended inputs resulting in a 6dB reduction in signal to noise ratio relative to differential inputs. The M4670 also
provides the possibility of DC input coupling, eliminating the need for two external AC coupling, DC blocking
capacitors. The M4670 also can be used, but as a single-ended input amplifier while still retaining it is an entirely
different interests. The main advantage of a differential amplifier is to increase common-mode rejection ratio (CMRR)
for a single input amplifier.
SHUTDOWN FUNCTION
In order to reduce power consumption while not in use, the M4670 contains shutdown circuit current
consumption reduced to less than the reduced 0.01μA. For the closure of trigger point is displayed as a table of
electrical characteristics and typical shutdown hysteresis voltage diagram found in some of the typical performance
characteristics. The best is to switch on the ground and use the smallest current supply, while in the closed state.
The M4670 may be disabled chip off the ground and supply voltage, the idle current is larger than the typical value of
reduced 0.01μA. Total harmonic distortion may increase, but also can be observed when the voltage is less than the
diameter of the shutdown pin in PLAY mode.
There has a resistor connected between GND and Shutdown pins in the M4670 internal, and this resistor is
designed to eliminate any unnecessary state changes, when the Shutdown pin is floating. To minimize the supply
current when the M4670 working in the Shutdown mode, if the M4670 don’t working in the Shutdown mode, the
amount of additional resistor current due to the internal shutdown resistor can be found be Equation (1) below.
(VSD - GND) / 300kΩ (1)
The difference is only 0.5V, the current additional 1.7μA, lots will be drawn, while in the closed state.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
5 of 8
QW-R502-442.d
M4670

Preliminary
CMOS IC
APPLICATION INFORMATION (Cont.)
PROPER SELECTION OF EXTERNAL COMPONENTS
The M4670’s gain is set by the external resistors Ri, shown in Fig. 2, the gain of the equation by (2) is given.
When the gain of 2V/V (6dB), the THD+N performance of the best.
AV = 2 * 150 kΩ/ Ri (V/V) (2)
We recommend an external resistor Ri of the error within 1%, and the resistance should be close to M4670
input pins to keep two symmetrical inputs, which will help improve the M4670 noise suppression due to the good
CMRR of the M4670. Noise coupled onto input traces which are physically close to each other will be common mode
and easily rejected by the M4670. Input capacitors may be needed for some applications or when the source is
single- ended (Fig. 4, 6). Input capacitors are needed to block any DC voltage at the source so that the DC voltage
seen between the input terminals of the M4670 is 0V. Input capacitors create a high-pass filter with the input
resistors, Ri. The -3dB point of the high-pass filter is found using Equation (3) below.
fC = 1 / (2πRi Ci ) (Hz) (3)
Of course, the input capacitors can also be used to remove the low audio frequencies. When using the M4670
single-ended source, power supply noise on the ground is a +IN input pin capacitance-coupled input signals are on
the ground (Fig. 6~8). Setting the high-pass filter point above the power supply noise over the frequency of 217Hz in
the GMS mobile phone.
DIFFERENTIAL CIRCUIT CONFIGURATIONS
The M4670 can be used in many different circuit configurations. The most typical is the DC-coupled,
differential input configuration shown in Fig. 3. Equation(2) above is used to determine the value of the Ri resistors
for a desired gain.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
6 of 8
QW-R502-442.d
M4670

Preliminary
CMOS IC
APPLICATION INFORMATION (Cont.)
Input capacitors can be used in a differential configuration as shown in Fig. 4. Equation (3) above is used to
determine the value of the Ci capacitors for a desired frequency, Equation (2) above is used to determine the value
of the Ri resistors for a desired gain.
The M4670 can be used for amplification of multiple audio sources. The application configuration as shown in
Fig. 5. Each input gain can be independently set the maximum use of each input and the design equation (2) on the
Ri resistors of flexibility. Input capacitance can be used with one or more than one source, as well as the different
frequency response according to the source or DC voltage, if necessary from the source block.
SINGLE-ENDED CIRCUIT CONFIGURATIONS
The M4670 can be used for single-ended input capacitance of the source, but will need to enter the terminal to
prevent any DC. For the gain equations, Equation (2), frequency response, Equation (3), the typical application
configuration as shown in Fig. 6.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
7 of 8
QW-R502-442.d
M4670

Preliminary
CMOS IC
APPLICATION INFORMATION (Cont.)
If the input signal as shown in Fig. 7, the equivalent impedance of each input should be equal. To find the
correct values for Ci3 and Ri3, which are found by calculating the parallel combination of all Ci values and all Ri
values. Equations (4) and (5) below are for any number of single-ended sources.
Ci3 = Ci1 + Ci2 + Cin ... (f) (4)
Ri3 = 1 / (1/Ri1 + 1/Ri2 + 1/Rin ...)(Ω) (5)
The M4670 also can use a combination of single-ended and differential sources. A typical application with one
single-ended source and one differential source is shown in Fig. 8. The use of superposition principle, the external
component values can be determined according to the configuration of the above equations(4)(5).
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
8 of 8
QW-R502-442.d
Similar pages