Document
CM8601
3 Watt Audio Power Amplifier with Selectable Shutdown Logic Level
General Description
The CM8601 is an audio power amplifier primarily designed for demanding applications in mobile phones and other por-table communication device applications. It is capable of delivering 1.25 watts of continuous average power to an 8 BTL load and 2 watts of continuous average power (LD and MH only) to a 4ΩBTL load with less than 1% distortion (THD+N+N) from a 5VDC power supply.
Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The CM8601 does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited for mobile phone and other low voltage appli- cations where minimal power consumption is a primary re- quirement.
The CM8601 features a low-power consumption shutdown mode. To facilitate this, Shutdown may be enabled by either logic high or low depending on mode selection. Driving the shutdown mode pin either high or low enables the shutdown pin to be driven in a likewise manner to enable shutdown.
The CM8601 contains advanced pop & click circuitry which eliminates noise which would otherwise occur during turnon and turn-off transitions.
The CM8601 is unity-gain stable and can be configured by external gain-setting resistors.
Key Specifications
Ø Improved PSRR at 217Hz & 1KHz
62dB
Ø Power Output at 5.0V,
10% THD+N, 4Ω (LD and MH only)
3W (typ)
Ø Power Output at 5.0V, 1% THD+N, 8Ω 1.25W (typ)
Features
Available in space-saving packages:SOP-8 Ø Ultra low current shutdown mode Ø Improved pop & click circuitry eliminates noise
during turn-on and turn-off transitions Ø 1.8V – 7.0V operation
Applications
Ø Mobile Phones Ø PDAs
Ø Power Output at 3.0V, 1% THD+N, 4Ω 600mW (typ)
Ø Power Output at 3.0V, 1% THD+N, 8Ω 425mW (typ)
Ø Shutdown Current
0.1µA (typ)
Ø No output coupling capacitors, snubber networks or bootstrap capacitors required
Ø Unity-gain stable Ø External gain configuration capability Ø User selectable shutdown High or Low logic Level
Ø Portable electronic device
Connection Diagrams
SOP-8
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CM8601
3 Watt Audio Power Amplifier with Selectable Shutdown Logic Level
Package LD MH MM ITL
Shutdown Mode
Selectable
Selectable
Low
Low
Typical Power Output at 10% THD+N 3W 10% THD+N 3W
5V
(RL = 4Ω)
(RL = 4Ω)
1% THD+N 1.25W 1% THD+N 1.25W
(RL = 8Ω)
(RL = 8Ω)
. A SD_MODE select pin determines the Shutdown Mode for the LD and MH packages, whether it is an Asserted High
or an Asserted Low device, to activate shutdown.
. The SD_MODE select pin is not available with the MM and ITL packaged devices. Shutdown occurs only with a low
assertion.
Typical Application
Note: MM and ITL packaged devices are active low only; Shutdown Mode pin is internally tied to GND.
FIGURE 1. Typical Audio Amplifier Application Circuit (LD and MH)
Absolute Maximum Ratings (Note 2)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (Note 11) Storage Temperature Input Voltage
6.0V −65°C to +150°C −0.3V to VDD +0.3V
Power Dissipation (Notes 3, 12)
Internally Limited
ESD Susceptibility (Note 4)
2000V
ESD Susceptibility (Note 5) Junction Temperature
200V 150°C
Thermal Resistance θJC (MSOP) θJA (MSOP) θJA (9 Bump micro SMD) (Note 15)
56°C/W 190°C/W 180°C/W
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CM8601
3 Watt Audio Power Amplifier with Selectable Shutdown Logic Level
θJA (LLP)
63°C/W (Note 13)
θJC (LLP)
12°C/W (Note 13)
Soldering Information
See AN-1187 "Leadless
Leadframe Package (LLP)."
Operating Ratings
Temperature Range TMIN ≤ TA ≤ TMAX Supply Voltage
−40°C ≤ TA ≤ 85°C 2.2V ≤ VDD ≤ 5.5V
Electrical Characteristics VDD = 5V (Notes 1, 2)
The following specifications apply for the circuit shown in Figure 1, unless otherwise specified. Limits apply for TA = 25°C.
CM8601
Symbol
Parameter
Conditions
Typical
Limit
(Note 6) (Notes7, 9)
IDD
Quiescent power supply current
VIN=0V, IO=0A, No Load VIN=0V, IO=0A, 8Ω Load
3 4
7 10
ISD
Shutdown current
VSD=VSD Mode (Note 8)
0.1
2.0
VSDIH
Shutdown voltage input high
VSD MODE=VDD
1.5 --
VSDIL
Shutdown voltage input low
VSD MODE=VDD
1.3 --
VSDIH VSDIL
Shutdown voltage input high Shutdown voltage input low
VSD MODE=GND VSD MODE=GND
1.5 -1.3 --
VOS ROUT
PO TWU THD+N+N
PSRR
Output offset voltage
Resistor output to GND (Note 10) Output power (8Ω) (4Ω) (Note 13, 14) Wake-up time
Total harmonic distortion + Noise
Power supply rejection ratio
7
8.5
THD+N=1%(max); f=1KHz THD+N=10%(max); f=1KHz
PO=0.5Wrms; f=1KHz
Vripple=200mV sine p-p Input terminated with 10Ω
1.25
3
100
0.2 60 (f=217Hz) 64 (f=1KHz)
50 9.7 7.0 0.9 ----
55
Units (Limits)
mA(max) mA(max) uA(max)
V V V V mV(max) KΩ(max) KΩ(min) W(min)
W
ms %
dB(min)
Electrical Ch.