SGM4917
80mW, Capless, Stereo Headphone Amplifier with Shutdown
JULY 2017 –REV. A. 3 SG Micro Corp
www.sg-micro.com
GENERAL DESCRIPTION
The SGM4917 stereo headphone amplifier is designed for portable equipment where board space is at a premium. The SGM4917 uses capless architecture to produce a ground-referenced output from a single power supply, eliminating the need for large DC-blocking capacitors for output, saving cost, board space, and component height. Additionally, for SGM4917B, the gain is set internally (-2V/V), further reducing component count. For SGM4917A, the gain can be adjusted by external feedback resistors.
The SGM4917 delivers up to 80mW per channel into a 32Ω load and has low 0.02% THD+N. A -78dB power supply rejection ratio (PSRR) at 217Hz allows this device to operate from noisy digital supplies without an additional linear regulator. Comprehensive click-and- pop circuitry suppresses audible clicks and pops on startup and shutdown.
The SGM4917 operates from a single 2.7V to 5.5V supply, consumes only 2.7mA supply current, and is specified over the extended -40 to +85 temperature range. The SGM4917 is available in a Green TQFN-3×3-16L package.
FEATURES • SGM4917A: External Feedback Gain Network
SGM4917B: Fixed -2V/V Gain • No Bulky DC-Blocking Capacitors Required • Ground-Referenced Outputs Eliminate DC-Bias
Voltage on Headphone Ground Pin • No Degradation of Low-Frequency Response
Due to Output Capacitors • Differential Inputs for Enhanced Noise Cancellation • 80mW into 32Ω Load from 5V Power Supply at
THD+N = 0.1% (TYP, per Channel) • Low 0.02% THD+N • High PSRR (-78dB at 217Hz) • Integrated Click-and-Pop Suppression • 2.7V to 5.5V Single Supply Operation • Low Quiescent Current (2.7mA at VDD = 5V) • Shutdown Control • Under-Voltage Lockout Function • -40 to +85 Operating Temperature Range • Available in a Green TQFN-3×3-16L Package
APPLICATIONS Notebook PCs Cellular Phones PDAs MP3 Players Smart Phones Portable Audio Equipment
80mW, Capless, Stereo Headphone SGM4917 Amplifier with Shutdown
2 JULY 2017 SG Micro Corp
www.sg-micro.com
PACKAGE/ORDERING INFORMATION
MODEL GAIN (V/V)
PACKAGE DESCRIPTION
SPECIFIED TEMPERATURE
RANGE ORDERING NUMBER
PACKAGE MARKING
PACKING OPTION
SGM4917A ADJ TQFN-3×3-16L -40 to +85 SGM4917AYTQ16G/TR 4917AQ XXXXX Tape and Reel, 3000
SGM4917B -2 TQFN-3×3-16L -40 to +85 SGM4917BYTQ16G/TR 4917BQ XXXXX Tape and Reel, 3000
MARKING INFORMATION NOTE: XXXXX = Date Code and Vendor Code.
Date Code - WeekVendor Code
Date Code - Year
X XXX X
Green (RoHS & HSF): SG Micro Corp defines "Green" to mean Pb-Free (RoHS compatible) and free of halogen substances. If you have additional comments or questions, please contact your SGMICRO representative directly.
ABSOLUTE MAXIMUM RATINGS PVSS to SVSS................................................... -0.3V to +0.3V PGND to SGND .............................................. -0.3V to +0.3V PVDD to SVDD .................................................. -0.3V to +0.3V PVDD and SVDD to PGND or SGND ................... -0.3V to +6V PVSS and SVSS to PGND or SGND .................... -6V to +0.3V IN to SGND ............................ (SVSS - 0.3V) to (SVDD + 0.3V) SHDN to SGND ................................ -0.3V to (SVDD + 0.3V) OUT to SGND ........................ (SVSS - 0.3V) to (SVDD + 0.3V) C1P to PGND .................................... -0.3V to (PVDD + 0.3V) C1N to PGND ................................... (PVSS - 0.3V) to + 0.3V Output Short Circuit to GND or VDD ..................... Continuous Junction Temperature ................................................ +150 Storage Temperature Range ....................... -65 to +150 Lead Temperature (Soldering, 10s) ........................... +260 ESD Susceptibility HBM ............................................................................ 2000V HBM (Output pins to Supply and Ground pins) ........... 4000V MM ................................................................................ 150V RECOMMENDED OPERATING CONDITIONS Supply Voltage Range ....................................... 2.7V to 5.5V Operating Temperature Range ...................... -40 to +85
OVERSTRESS CAUTION Stresses beyond those listed in Absolute Maximum Ratings may cause permanent damage to the device. Exposure to absolute maximum rating conditions for extended periods may affect reliability. Functional operation of the device at any conditions beyond those indicated in the Recommended Operating Conditions section is not implied. ESD SENSITIVITY CAUTION This integrated circuit can be damaged by ESD if you don’t pay attention to ESD protection. SGMICRO recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. DISCLAIMER SG Micro Corp reserves the right to make any change in circuit design, or specifications without prior notice.
80mW, Capless, Stereo Headphone SGM4917 Amplifier with Shutdown
3 JULY 2017 SG Micro Corp
www.sg-micro.com
PIN CONFIGURATION (TOP VIEW)
OUTR
SVDD
OUTL
INL-
SVSS
INL+
PVSS
C1N
PGND
C1P
INR
+
SGN
D
INR
-
PVDD
TQFN-3×3-16L
SVD
D
SHD
N9
12
11
10
5 6 7 8
16 15 14 13
4
1
2
3
PIN DESCRIPTION
PIN NAME DESCRIPTION
1 PVDD Charge-Pump Power Supply. Powers charge-pump inverter, charge-pump logic, and oscillator. Connect to positive supply (2.7V to 5.5V). Bypass with a 1µF capacitor to PGND as close to the pin as possible.
2 C1P Flying Capacitor Positive Terminal.
3 PGND Power Ground. Connect to ground.
4 C1N Flying Capacitor Negative Terminal.
5 PVSS Charge-Pump Output. Connect to SVSS.
6 SGND Signal Ground. Connect to ground.
7 INR+ Noninverting Right-Channel Audio Input.
8 INR- Inverting Right-Channel Audio Input.
9,13 SVDD Amplifier Positive Power Supply. Connect to positive supply (2.7V to 5.5V). Bypass with a 1µF capacitor to SGND as close to the pin as possible.
10 OUTR Right-Channel Output.
11 SVSS Amplifier Negative Power Supply. Connect to PVSS.
12 OUTL Left-Channel Output.
14 INL- Inverting Left-Channel Audio Input.
15 INL+ Noninverting Left-Channel Audio Input.
16 SHDN Active-Low Shutdown Input. Exposed Paddle ‒ Exposed Paddle. Can be connected to GND or left floating.
80mW, Capless, Stereo Headphone SGM4917 Amplifier with Shutdown
4 JULY 2017 SG Micro Corp
www.sg-micro.com
ELECTRICAL CHARACTERISTICS (PVDD = SVDD = 5V, PGND = SGND = 0V, SHDN = SVDD, C1 = C2 = 1µF, RL = ∞, resistive load referenced to ground; for SGM4917A, gain = -1V/V (RIN = RF = 10kΩ); for SGM4917B, gain = -2V/V (internally set). TA = +25, unless otherwise noted.) (1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
General
Supply Voltage Range VDD 2.7 5.5 V
Quiescent Supply Current IDD 2.7 3.7 mA
Shutdown Supply Current ISHDN SHDN = SGND = PGND 0.01 8 µA
SHDN Input Logic High VIH 1.2 V
SHDN Input Logic Low VIL 0.4 V
SHDN to Full Operation Time tSON 3.2 ms
Amplifiers
Voltage Gain AV SGM4917B -2.12 -2 -1.88 V/V
Gain Matching ΔAV SGM4917B, between the right and left channels 0.2 %
Output Offset Voltage VOS Between IN+ and IN-, input AC-coupled to ground (SGM4917A) -5.5 1.1 5.5 mV
Input Impedance RIN SGM4917B, measured at INL and INR 12.5 14.6 17 kΩ
Common Mode Rejection Ratio CMRR Input referred, SGM4917A -70 dB
Power Supply Rejection Ratio PSRR f = 217Hz, VRIPPLE = 200mVP-P -78
dB f = 10kHz, VRIPPLE = 200mVP-P -70
Output Power POUT RL = 32Ω, THD+N = 0.1% 80 mW
Output Impedance in Shutdown 2 kΩ
Total Harmonic Distortion Plus Noise THD+N RL = 32Ω, POUT = 55mW, f = 1kHz 0.02 %
Signal-to-Noise Ratio SNR RL = 32Ω, POUT = 20mW, BW < 20kHz 100 dB
Capacitive Drive CL No sustained oscillation 200 pF
Charge-Pump Oscillator Frequency fOSC 200 350 500 kHz
Crosstalk RL = 32Ω, VIN = 200mVP-P, f = 10kHz AV = -1V/V 90 dB
Thermal Shutdown Threshold 137
Thermal Shutdown Hysteresis 11 NOTE: 1. For CIN, C1 and etc, please refer to the Functional Diagram and Typical Application on pages 8 and 9.
80mW, Capless, Stereo Headphone SGM4917 Amplifier with Shutdown
5 JULY 2017 SG Micro Corp
www.sg-micro.com
TYPICAL PERFORMANCE CHARACTERISTICS
THD+N vs. Output Power
Output Power (mW)
THD+N vs. Output Power
Output Power (mW)
0
50
100
150
200
250
300
350
0 50 100 150 200 250 300
Pow
er D
issi
patio
n (m
W)
Output Power (mW)
Power Dissipation vs. Output Power
VDD = 5V, RL = 32Ω f = 1kHz, BW < 22kHz
OUTPUTS IN PHASE
ONE CHANNEL DRIVEN
0
50
100
150
200
250
2.5 3 3.5 4 4.5 5 5.5
Out
put P
ower
(mW
)
Supply Voltage (V)
Output Power vs. Supply Voltage
RL = 32Ω, f = 1kHz, BW < 22kHz ONE CHANNEL DRIVEN
THD+N 1%
THD+N 10%
0
2
5
2
5
2
5
2
5
0
30
60
90
120
150
0 20 40 60 80 100 120
Pow
er D
issi
patio
n (m
W)
Output Power (mW)
Power Dissipation vs. Output Power
VDD = 3V, RL = 32Ω f = 1kHz, BW < 22kHz
OUTPUTS IN PHASE
ONE CHANNEL DRIVEN
0
50
100
150
200
250
2.5 3 3.5 4 4.5 5 5.5
Out
put P
ower
(mW
)
Supply Voltage (V)
Output Power vs. Supply Voltage
RL = 32Ω, f = 1kHz, BW < 22kHz OUTPUTS IN PHASE
THD+N 1%
THD+N 10%
10
5
2
1
0.5
0.2
0.1
0.05
0.02
0.01
0.005
0.002
0.001 25 50 75 100 125 150 175 200
OUTPUTS IN PHASE ONE CHANNEL DRIVEN
VDD = 5V RL = 32Ω f = 1kHz BW < 22kHz
10
5
2
1
0.5
0.2
0.1
0.05
0.02
0.01
0.005
0.002
0.001 10 20 30 40 50 60 70 80
OUTPUTS IN PHASE ONE CHANNEL DRIVEN
VDD = 3V RL = 32Ω f = 1kHz BW < 22kHz
THD
+N (%
)
THD
+N (%
)
80mW, Capless, Stereo Headphone SGM4917 Amplifier with Shutdown
6 JULY 2017 SG Micro Corp
www.sg-micro.com
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
THD+N vs. Frequency
Frequency (Hz)
THD+N vs. Frequency
Frequency (Hz)
-120
-100
-80
-60
-40
0.01 0.1 1 10 100
Cro
ssta
lk (d
B)
Frequency (kHz)
Crosstalk vs. Frequency
VDD = 5V, RL = 32Ω VOUT = 70mVRMS, AV = -2
RIGHT TO LEFT
LEFT TO RIGHT
-120
-100
-80
-60
-40
0.01 0.1 1 10 100
Cro
ssta
lk (d
B)
Frequency (kHz)
Crosstalk vs. Frequency
VDD = 5V, RL = 32Ω VIN = 200mVP-P, AV = -1
RIGHT TO LEFT
LEFT TO RIGHT
-120
-100
-80
-60
-40
0.01 0.1 1 10 100
Cro
ssta
lk (d
B)
Frequency (kHz)
Crosstalk vs. Frequency
VDD = 3V, RL = 32Ω VOUT = 70mVRMS, AV = -2
RIGHT TO LEFT
LEFT TO RIGHT
-120
-100
-80
-60
-40
0.01 0.1 1 10 100
Cro
ssta
lk (d
B)
Frequency (kHz)
Crosstalk vs. Frequency
VDD = 3V, RL = 32Ω VIN = 200mVP-P, AV = -1
RIGHT TO LEFT
LEFT TO RIGHT
10
5
2
1
0.5
0.2
0.1
0.05
0.02
0.01
0.005
0.002
0.001 10 20 50 100 200 500 1k 2k 5k 10k 20k 50k 100k
PO = 5mW PO = 20mW PO = 80mW
VDD = 5V RL = 32Ω AV = -1V/V BW < 22kHz
THD
+N (%
)
10
5
2
1
0.5
0.2
0.1
0.05
0.02
0.01
0.005
0.002
0.001 10 20 50 100 200 500 1k 2k 5k 10k 20k 50k 100k
PO = 5mW PO = 20mW PO = 40mW
VDD = 3V RL = 32Ω AV = -1V/V BW < 22kHz
THD
+N (%
)
80mW, Capless, Stereo Headphone SGM4917 Amplifier with Shutdown
7 JULY 2017 SG Micro Corp
www.sg-micro.com
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
-100
-80
-60
-40
-20
0
0.01 0.1 1 10 100
PSR
R (d
B)
Frequency (kHz)
Power Supply Rejection Ratio vs. Frequency
VDD = 5V, RL = 32Ω Input AC-coupled to GND VRIPPLE = 200mVP-P
LEFT CHANNEL
RIGHT CHANNEL
-100
-80
-60
-40
-20
0
0.01 0.1 1 10 100
PSR
R (d
B)
Frequency (kHz)
Power Supply Rejection Ratio vs. Frequency
VDD = 5V, RL = 32Ω Input AC-coupled to GND VRIPPLE = 100mVP-P
LEFT CHANNEL
RIGHT CHANNEL
-100
-90
-80
-70
-60
-50
2.5 3 3.5 4 4.5 5 5.5
PSR
R (d
B)
Supply Voltage (V)
PSRR vs. Supply Voltage
f = 1kHz VRIPPLE = 200mVP-P
LEFT CHANNEL
RIGHT CHANNEL
-100
-80
-60
-40
-20
0
0.01 0.1 1 10 100
PSR
R (d
B)
Frequency (kHz)
Power Supply Rejection Ratio vs. Frequency
VDD = 3V, RL = 32Ω Input AC-coupled to GND VRIPPLE = 200mVP-P
LEFT CHANNEL
RIGHT CHANNEL
-100
-80
-60
-40
-20
0
0.01 0.1 1 10 100
PSR
R (d
B)
Frequency (kHz)
Power Supply Rejection Ratio vs. Frequency
VDD = 3V, RL = 32Ω Input AC-coupled to GND VRIPPLE = 100mVP-P
LEFT CHANNEL
RIGHT CHANNEL
0
0.5
1
1.5
2
2.5
3
3.5
4
2.5 3 3.5 4 4.5 5 5.5
Turn
-On
Tim
e (m
s)
Supply Voltage (V)
Turn-On Time vs. Supply Voltage
80mW, Capless, Stereo Headphone SGM4917 Amplifier with Shutdown
8 JULY 2017 SG Micro Corp
www.sg-micro.com
FUNCTIONAL DIAGRAM AND TYPICAL APPLICATION
CHARGEPUMP
UVLO/SHUTDOWNCONTROL
CLICK-AND-POPSUPPRESSION
_
+
_
+
2.7V to 5.5V
C31µF
1
PVDD
9,13
SVDD
16
SHDN
14
INL-
LEFTCHANNELAUDIO IN
CIN1µF RIN* RF*
OUTL 12
HEADPHONEJACK
10OUTR
RIN* RF*CIN1µF
RIGHTCHANNELAUDIO IN
8
INR-
6
SGND
3
PGNDSVSS
11
PVSS
5
C21µF
C1P
C1N
C11µF
2
4
INR+
7
SVDD
SVDD
SVSS
SVSS
* FOR SGM4917A, RIN AND RF ARE EXTERNAL TO THE DEVICE. FOR SGM4917B, RIN AND RF ARE INTERNAL TO THE DEVICE, RIN = 15kΩ, RF = 30kΩ
15
INL+
10kΩ
To External Power Supply or Control I/O
Figure 1. Typical Single-Ended Input Application Circuit NOTES: 1. To ensure the normal operation of the device, decoupling capacitor (C3) must be placed as close to SGM4917 as possible. The loop length formed by C3, SVDD and GND should be no longer than 1.2cm; otherwise the device will not start up at high supply voltage. 2. In order to get good performance, it’s important to select the right C1, C2 and C3 in application. All tests are performed with circuit set up with X5R and X7R capacitors. Capacitors having high dissipative loss, such as Y5V capacitor, may cause performance degradation and unexpected system behavior. 3. A 10kΩ resistor must be serially connected to SHDN pin.
80mW, Capless, Stereo Headphone SGM4917 Amplifier with Shutdown
9 JULY 2017 SG Micro Corp
www.sg-micro.com
FUNCTIONAL DIAGRAM AND TYPICAL APPLICATION (continued)
CHARGEPUMP
UVLO/SHUTDOWNCONTROL
CLICK-AND-POPSUPPRESSION
_
+
_
+
2.7V to 5.5V
C31µF
1
PVDD
9,13
SVDD
16
SHDN
14
INL-
LEFTCHANNELAUDIO IN
CIN1µF
RIN1* RF1*
OUTL 12
HEADPHONEJACK
10OUTR
RIN1* RF1*
CIN1µF
RIGHTCHANNELAUDIO IN
8
INR-
6
SGND
3
PGNDSVSS
11
PVSS
5
C21µF
C1P
C1N
C11µF
2
4
INR+
7
SVDD
SVDD
SVSS
SVSS
* FOR SGM4917A, RIN_ AND RF_ ARE EXTERNAL TO THE DEVICE. FOR SGM4917B, RIN_ AND RF_ ARE INTERNAL TO THE DEVICE, RIN1 = 15kΩ, RF1 = 30kΩ, RIN2 = 15kΩ, RF2 = 30kΩ
15
INL+
RIN2*
RF2*
LEFTCHANNELAUDIO IN
RIN2*
RF2*
RIGHTCHANNELAUDIO IN
CIN1µF
CIN1µF
10kΩ
To External Power Supply or Control I/O
Figure 2. Typical Differential Input Application Circuit NOTES: 1. To ensure the normal operation of the device, decoupling capacitor (C3) must be placed as close to SGM4917 as possible. The loop length formed by C3, SVDD and GND should be no longer than 1.2cm; otherwise the device will not start up at high supply voltage. 2. In order to get good performance, it’s important to select the right C1, C2 and C3 in application. All tests are performed with circuit set up with X5R and X7R capacitors. Capacitors having high dissipative loss, such as Y5V capacitor, may cause performance degradation and unexpected system behavior. 3. A 10kΩ resistor must be serially connected to SHDN pin.
80mW, Capless, Stereo Headphone SGM4917 Amplifier with Shutdown
10 JULY 2017 SG Micro Corp
www.sg-micro.com
REVISION HISTORY NOTE: Page numbers for previous revisions may differ from page numbers in the current version. JULY 2017 ‒ REV.A.2 to REV.A.3
Updated Typical Application Circuit .................................................................................................................................................................. 8-9
DECEMBER 2012 ‒ REV.A.1 to REV.A.2
Added note for Typical Application Circuit ......................................................................................................................................................... 8-9
SEPTEMBER 2012 ‒ REV.A to REV.A.1
Added Tape and Reel Information ................................................................................................................................................................ 11-12
Changes from Original (FEBRUARY 2012) to REV.A
Changed from product preview to production data ............................................................................................................................................. All
PACKAGE INFORMATION
TX00081.000 SG Micro Corp www.sg-micro.com
PACKAGE OUTLINE DIMENSIONS TQFN-3×3-16L
Symbol Dimensions
In Millimeters Dimensions
In Inches MIN MAX MIN MAX
A 0.700 0.800 0.028 0.031 A1 0.000 0.050 0.000 0.002 A2 0.203 REF 0.008 REF D 2.900 3.100 0.114 0.122
D1 1.600 1.800 0.063 0.071 E 2.900 3.100 0.114 0.122
E1 1.600 1.800 0.063 0.071 k 0.200 MIN 0.008 MIN b 0.180 0.300 0.007 0.012 e 0.500 TYP 0.020 TYP L 0.300 0.500 0.012 0.020
TOP VIEW BOTTOM VIEW
SIDE VIEW
A
A2
A1
e
E1
b
L
k
D1
D
E
N1
N5
N16
1.7
1.7
0.7
2.23.6
0.5 0.24
RECOMMENDED LAND PATTERN (Unit: mm)
PACKAGE INFORMATION
TX10000.000 SG Micro Corp www.sg-micro.com
TAPE AND REEL INFORMATION NOTE: The picture is only for reference. Please make the object as the standard.
KEY PARAMETER LIST OF TAPE AND REEL
Package Type Reel Diameter
Reel Width W1
(mm) A0
(mm) B0
(mm) K0
(mm) P0
(mm) P1
(mm) P2
(mm) W
(mm) Pin1
Quadrant
DD
0001 TQFN-3×3-16L 13″ 12.4 3.35 3.35 1.13 4.0 8.0 2.0 12.0 Q1
Reel Width (W1)
Reel Diameter
REEL DIMENSIONS
TAPE DIMENSIONS
DIRECTION OF FEED
P2 P0
W
P1 A0 K0
B0Q1 Q2
Q4Q3 Q3 Q4
Q2Q1
Q3 Q4
Q2Q1
PACKAGE INFORMATION
TX20000.000 SG Micro Corp www.sg-micro.com
CARTON BOX DIMENSIONS NOTE: The picture is only for reference. Please make the object as the standard.
KEY PARAMETER LIST OF CARTON BOX
Reel Type Length (mm)
Width (mm)
Height (mm) Pizza/Carton
DD
0002 13″ 386 280 370 5