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Web:www.orient-chip.com
OCA7237
Multi-level Constant Output Power Class D Audio Amplifier
General Description
The OCA7237 is a high efficiency filter-less Class-
D audio power amplifier with Automatic Gain Control
(AGC) technology and an integrated high efficiency
charge pump boost power supply. The device
constantly monitors output power and dynamically
adjust internal gain to prevent long time overstress
across the speaker.
The integrated charge pump structure generates
5.9V supply for output stage of amplifier. It can deliver
1W (THD+N=1%) of continuous average power to an
8Ω load by a lithium/Ion battery. The OCA7237 features
high efficiency up to 81%, which helps extend battery
life when playing audio.
The AGC with multi-level constant output power
technology helps designer to select suitable output
power which match the speaker.
The OCA7237 has a 47μVrms low output noise at
gain=8V/V to improve the signal to noise ratio (SNR).
The OCA7237 is available in small
1.57mmX1.61mm 14-ball WLCSP package with 400μm
pitch.
Features
Built-In AGC With 4 Constant Output Power
Control:1.2W,1W,0.8W,0.6W@8Ω
Built-in Charge Pump Power Supply
Low Output Noise : 47μVrms @ gain=8V/V
Vdd=3.8V(A-Weighted)
High Efficiency : 81%
2.2W Output into 8Ω Load at 4.2V With
THD+N=10%
THD+N:0.015%@1kHz,500mW,8Ω
Load,3.8V Supply
Thermal and Short-Circuit Protection with
Auto Recovery
Built-in Pop-and-click noise suppression
Low RF Susceptibility
single wire Pulse Control
Available in 1.57mmX1.61mm 14-ball
WLCSP Packager
Applications
Mobile Phones and Tablets
Portable Media Players
Page1-3
Ver1.6 Mar .9, 2018
源于灿瑞 磁传天下

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Web:www.orient-chip.com
OCA7237
Multi-level Constant Output Power Class D Audio Amplifier
Simplified Application Diagram
Cf1=2.2uF
Cf2=2.2uF
VBAT
CS1=4.7uF CS2=0.1uF
C1P
(D2)
VDD(A3B3)
C1N
(C1)
C2P
(D1)
C2N
(B1)
CHARGE-PUMP
PVDD(D3)
CIN =15nF
Audio
Input
CIN =15nF
GPIO_PA
RIN =3kΩ
CLF =220pF
RIN =3kΩ
OCA7237
INP(A1)
AGC
INN(A2)
SHDN(A4)
RSO =100kΩ
AMP
GND(C2C4)
VON(D4)
PWM
VOP(B4)
CPVDD=4.7uF/10V
FB1
Ferrite Bead
CO =1nF
FB2
Ferrite Bead
Pin Configuration and Functions
OCA7237 TOP VIEW
C2P
C1P
PVDD
VON
D1 D2 D3 D4
C1N GND
C1 C2
C4
C2N VDD VOP
B1 B3 B4
INP INN
A1 A2
SHDN
A3 A4
Power
Analog
Digital
OCA7237 MARKING DIAGRAM
FLB
YWWX
Page2-3
Ver1.6 Mar .9, 2018
源于灿瑞 磁传天下

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Web:www.orient-chip.com
OCA7237
Multi-level Constant Output Power Class D Audio Amplifier
PIN No.
A1
A2
A3B3
A4
B1
B4
C1
C2,C4
D1
D2
D3
D4
Table 1 Pin Functions
PIN
Name
INP
Description
Positive audio input of the Class D Audio Amplifier
INN Negative audio input of the Class D Audio Amplifier
VDD Supply voltage
SHDN Single wire Pulse Control Terminal
C2N Charge-Pump Flying Capacitor Terminal
VOP Positive PWM audio Output of the Class D Audio Amplifier
C1N Charge-Pump Flying Capacitor Terminal
GND Ground
C2P Charge-Pump Flying Capacitor Terminal
C1P Charge-Pump Flying Capacitor Terminal
PVDD Audio power stage supply voltage
VON Negative PWM audio Output of the Class D Audio Amplifier
Ordering Information
Device
OCA7237WPAD
Temperature
Range
40°C to +85°
C
Package
14-ball WLCSP
1.57x1.61mm
Shipping
3000 / tape & Reel
MSL
1
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Page3-3
Ver1.6 Mar .9, 2018
源于灿瑞 磁传天下