Document
NCP4894
1.8 Watt Differential Audio Power Amplifier with Selectable Shutdown
The NCP4894 is a differential audio power amplifier designed for portable communication device applications. This feature and the excellent audio characteristics of the NCP4894 are a guarantee of a high quality sound, for example, in mobile phones applications. With a 10% THD+N value the NCP4894 is capable of delivering 1.8 W of continuous average power to an 8.0 W load from a 5.5 V power supply. With the same load conditions and a 5.0 V battery voltage, it ensures 1.0 W to be delivered with less than 0.01% distortion.
The NCP4894 provides high quality audio while requiring few external components and minimal power consumption. It features a low−power consumption shutdown mode.
To be flexible, shutdown may be enabled by either a logic high or low depending on the voltage applied on the SD MODE pin.
The NCP4894 contains circuitry to prevent from “pop and click” noise that would otherwise occur during turn−on and turn−off transitions.
For maximum flexibility, the NCP4894 provides an externally controlled gain (with resistors), as well as an externally controlled turn−on time (with bypass capacitor).
Due to its excellent PSRR, it can be directly connected to the battery, saving the use of an LDO.
This device is available in 9−Pin Flip−Chip, Micro−10 and DFN10 3x3 mm packages.
Features
• Differential Amplification • Shutdown High or Low Selectivity • 1.0 W to an 8.0 W Load from a 5.0 V Power Supply • Superior PSRR: Direct Connection to the Battery • “Pop and Click” Noise Protection Circuit • Ultra Low Current Shutdown Mode • 2.2 V−5.5 V Operation • External Gain Configuration Capability • External Turn−on Configuration Capability • Thermal Overload Protection Circuitry • Pb−Free Packages are Available
Typical Applications
• Portable Electronic Devices • PDAs • Mobile Phones
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MARKING DIAGRAMS
1
9−PIN FLIP−CHIP FC SUFFIX CASE 499AL
A3
xxxG AYWW
C1
A1
8 1
Micro−10 DM SUFFIX CASE 846B
xxxx AYWG
G
DFN10
1
MN SUFFIX
xxx
CASE 485C
ALYWG
1G
xxxx = Specific Device Code A = Assembly Location L = Wafer Lot Y = Year W, WW = Work Week G = Pb−Free Package (Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering and shipping information in the package dimensions section on page 15 of this data sheet.
© Semiconductor Components Industries, LLC, 2007
January, 2007 − Rev. 9
1
Publication Order Number: NCP4894/D
NCP4894
Rf1 20 kW VP
Cs 1 mF
Negative Diff Input from DAC
Ci1 Ri1 390 nF 20 kW
Cb
INM VP
BYPASS VP
BYPASS 1 mF
VMC BRIDGE
SHUTDOWN CONTROL
SD MODE 0
0 1 1
SD SELECT 0
1 0 1
Status Shutdown
On On Shutdown
Positive Diff Input from DAC
Ci2 Ri2 390 nF 20 kW
SD SELECT
SD MODE BYPASS
INP
VM
− OUTA +
SHUTDOWN CONTROL + OUTB −
20 kW Rf2
Figure 1. Typical NCP4894 Application Circuit with Differential Input
RL 8W
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NCP4894
Rf2 20 kW VP
Cs 1 mF
Left Channel Input
Ci1 Ri1 390nF 20 kW
VP INM
BYPASS VP
−
+
BYPASS Cb 1 mF
VMC BRIDGE
OUTA
SHUTDOWN CONTROL
SD MODE SD SELECT Status
0 0 Shutdown 0 1 On 1 0 On 1 1 Shutdown
Right Channel Input
Ci2 Ri2 390nF 20 kW
SD SELECT SD MODE INP BYPASS
VM
SHUTDOWN CONTROL
+
− OUTB
Co1 47uF
Co2 47uF
32W /
16W
Earpiece
32W /
16W
Rf1
20 kW Figure 2. Typical NCP4894 Application Circuit for Driving Earpiece
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NCP4894
PIN CONNECTIONS
9−Pin Flip−Chip
Micro−10
DFN10
A1 A2 A3 INP BYPASS OUTB
B1 B2 B3 VP SD MODE VM C1 C2 C3
INM SD SELECT OUTA (Top View)
SD SELECT 1
INM 2
SD MODE INP
BYPASS
3 4 5
(Top View)
10 OUTA
9 VP
8 NC 7 VM 6 OUTB
SD SELECT 1 INM 2
SD MODE 3 INP 4
BYPASS 5
10 OUTA 9 VP 8 NC 7 VM 6 OUTB
(Top View)
PIN DESCRIPTION
9−Pin Flip−Chip Micro−10/DFN10 Type Symbol
Description
A1 4 I INP Positive Differential Input
A2 5 O BYPASS Bypass Capacitor Pin which Provides the Common Mode Voltage
A3
6
I
OUTB
Negative BTL Output
B1 9 I VP Positive Analog Supply of the Cell
B2 3 I SD MODE Shutdown High or Low Selectivity (Note 1)
B3 7 I VM Ground
C1 2 I INM Negative Differential Input
C2 1 O SD SELECT (Note 1)
C3
10
I
OUTA
Positive BTL Output
1. The SD SELECT pin must be toggled to the same state as the SD MODE pin to force the device in shutdown mode.
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NCP4894
MAXIMUM RATINGS (Note 2) Rating
Symbol
Value
Unit
Supply Voltage
VP 6.0 V
Operating Supply Voltage
Op VP
2.2 to 5.5 V
−
Input Voltage Max Output Current
Vin
−0.3 to Vcc +0.3
V
Iout 500 mA
Power Dissipation (Note 3)
Pd
Internally Limited
−
Operating Ambient Temperature Max Junction Temperature Storage Temperature Range Thermal Resistance Junction−to−Air
Micro−10 DFN 3x3 mm 9−Pin Flip−Chip
TA TJ Tstg RqJA
−40 to +85
150
−65 to +150
200 70 (Note 4)
°C °C °C °C/W
ESD Protection
Human Body Model (HBM) (Note 5) Machine Model (MM) (Note 6)
−
> 2000 > 200.