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OCA7890A
2.4Watt Class AB Audio Power Amplifier
General Description
The OCA7890A is an audio power amplifier
primarily designed for demanding applications in
mobile phones and other portable communication
device applications. It is capable of delivering 1.41W
of continuous average power to an 8Ω BTL load with
less than 1% distortion (THD+N) from a 5V DC power
supply.
Audio power amplifiers were designed specifically
to provide high quality output power with a minimal
amount of external components. The OCA7890A does
not require output coupling capacitors or bootstrap
capacitors, and therefore is ideally suited for mobile
phone and other low voltage applications where
minimal power consumption is a primary requirement.
The OCA7890A features a low power
consumption shutdown mode, which is achieved by
driving the shutdown pin with logic low. Additionally,
the OCA7890A features an internal thermal shutdown
protection mechanism.
The OCA7890A contains advanced pop and click
circuitry which eliminates noises which would
otherwise occur during turn-on and turn-off transitions.
The OCA7890A is unity-gain stable and can be
configured by external gain-setting resistors.
Features
PSRR at 217Hz, VDD=4.2V (Fig.1) 71dB(typ.)
2.4W Output @VDD=5.0V, THD=1%, 4Ω Load
1.41W Output @VDD=5.0V, THD=1%, 8Ω Load
0.5W Output @VDD=3.0V, THD=1%, 8Ω Load
Shutdown Current 0.1μA(typ.)
Available in space-saving packages: WLCSP-9
Ultra low current shutdown mode
BTL output can drive capacitive loads
Improved pop and click circuitry eliminates
noises during turn-on and turn-off transitions
2.2V - 5.5V operation
No output coupling capacitors, snubber
networks or bootstrap capacitors required
Thermal shutdown protection
Unity-gain stable
External gain configuration capability
Applications
Mobile Phones
PDA
Portable electronic devices
Pin Configuration
WLCSP9
(Top View)
Name
IN−
IN+
VO1
VO2
VDD
/SD
Bypass
GND
No.
WLCSP9
A1
A3
A2
C2
B3
C3
C1
B1, B2
I/O Descriptions
I Negative differential input
I Positive differential input
O Negative BTL output
O Positive BTL output
P Power supply
I Shutdown terminal, hold low for shutdown mode (active low logic)
I Bypass capacitor which provides the common mode voltage
I High-current ground
Page1 - 2
Rev. 1.1 Feb .27, 2018
源于灿瑞 磁传天下

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OCA7890A
2.4Watt Class AB Audio Power Amplifier
Ordering Information
OCA7890AX X X
Package:
WP: WLCSP9
Packing:
A: Tape & Reel
Temperature Grade:
D: -40~85
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Page2 - 2
Rev. 1.1 Feb .27, 2018
源于灿瑞 磁传天下