Document Title Document ID/Size Revision Score 1.35 Watt Audio Power Amplifier with Selectable Fast Turn On Time
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© Semiconductor Components Industries, LLC, 2009 November, 2009 - Rev. 2 1 Publication Order Number: NCP2991/D NCP2991 1.35 Watt Audio Power Amplifier with Selectable Fast Turn On Time The NCP2991 is an audio power amplifier designed for portable communication device applications such as mobile phone applications. The NCP2991 is capable of delivering 1.35 W of continuous average power to an 8.0 BTL load from a 5.0 V power supply, and 1.1 W to a 4.0 BTL load from a 3.6 V power supply. The NCP2991 provides high quality audio while requiring few external components and minimal power consumption. It features a low-power consumption shutdown mode, which is achieved by driving the SHUTDOWN pin with logic low. The NCP2991 contains circuitry to prevent from “pop and click” noise that would otherwise occur during turn-on and turn-off transitions. It is a zero pop noise device when a single ended or a differential audio input is used. For maximum flexibility, the NCP2991 provides an externally controlled gain (with resistors). In addition, it integrates 2 different Turn On times (15 ms or 30 ms) adjustable with the TON pin. Due to its superior PSRR, it can be directly connected to the battery, saving the use of an LDO. This device is available in a 9-Pin Flip-Chip CSP (Lead-Free). Features • 1.35 W to an 8.0 BTL Load from a 5.0 V Power Supply • Best-in-Class PSRR: up to -100 dB, Direct Connection to the Battery • Zero Pop Noise Signature with a Single Ended Audio Input • Ultra Low Current Shutdown Mode: 10 nA • 2.5 V-5.5 V Operation • External Gain Configuration Capability • External Turn-on Time Configuration Capability: 15 ms or 30 ms • Thermal Overload Protection Circuitry • This is a Pb-Free Device* Typical Applications • Portable Electronic Devices • PDAs • Wireless Phones *For additional information on our Pb-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. 9-Pin Flip-Chip CSP FC SUFFIX CASE 499E PIN CONNECTIONS MRH = Specific Device Code A = Assembly Location Y = Year WW = Work Week = Pb-Free Package MARKING DIAGRAMS A3 B3 C3 A2 B2 C2 A1 B1 C1 INM OUTA INP VM TON VP BYPASS OUTB SHUTDOWN (Top View) See detailed ordering and shipping information in the package dimensions section on page 14 of this data sheet. ORDERING INFORMATION MRH AYWW http://onsemi.com A1

NCP2991 http://onsemi.com 2 Figure 1. Typical Audio Amplifier Application Circuit with Single Ended Input + - + - INM Vp Vp Vp 8 OUTA OUTB R1 20 k R2 20 k INP BYPASS 24 k 1 F 100 nF TON VM SHUTDOWN CONTROL Cbypass 24 k Cs 1 F SHUTDOWN Rf Ci Ri AUDIO INPUT Connect to Vp or GND Figure 2. Typical Audio Amplifier Application Circuit with a Differential Input + - + - INM Vp Vp Vp 8 OUTA OUTB R1 20 k R2 20 k INP BYPASS 24 k 1 F 100 nF TON VM SHUTDOWN CONTROL Cbypass 24 k Cs 1 F SHUTDOWN Rf Ci Ri AUDIO INPUT Connect to Vp or GND 100 nF 24 k Ci Ri Rf + - 24 k

NCP2991 http://onsemi.com 3 PIN DESCRIPTION Pin Name Type Description A1 INM I Negative input of the first amplifier, receives the audio input signal. Connected to the feedback resistor Rf and to the input resistor Rin. A2 OUTA O Negative output of the NCP2991. Connected to the load and to the feedback resistor Rf. A3 INP I Positive input of the first amplifier, receives the common mode voltage. B1 VM I Analog Ground. B2 TON I TON pin selects 2 different Turn On times: TON = GND -> 30 ms TON = VP -> 15 ms B3 VP I Positive analog supply of the cell. Range: 2.5 V-5.5 V. C1 BYPASS I Bypass...

NCP2991 http://onsemi.com 4 ELECTRICAL CHARACTERISTICS Limits apply for TA between -40°C to +85°C (Unless otherwise noted). Characteristic Symbol Conditions Min (Note 6) Typ Max (Note 6) Unit Supply Quiescent Current Idd Vp = 2.5 V, No Load Vp = 5.0 V, No Load - - 1.8 1.95 3.5 mA Vp = 2.5 V, 8 Vp = 5.0 V, 8 - - 1.8 1.95 3.5 Common Mode Voltage Vcm - - Vp/2 - V Shutdown Current ISD - 0.02 0.5 A Shutdown Pull-Down RSD - 300 - k Shutdown Voltage High VSDIH - 1.2 - - V Shutdown Voltage Low VSDIL - - - 0.4 V Turn On Time (Note 8) TWU TON = GND TON = VP - 30 15 - ms Turn Off Time TOFF - - 1.0 - s...

NCP2991 http://onsemi.com 5 TYPICAL CHARACTERISTICS Figure 3. THD+N vs. Frequency Figure 4. THD+N vs. Frequency FREQUENCY (Hz) 100 1,000 10,000 0.01 0.1 1 Figure 5. THD+N vs. Frequency Figure 6. THD+N vs. Frequency Figure 7. THD+N vs. Frequency Figure 8. THD+N vs. Frequency THD+N (%) THD+N VP = 2.5 V Pout = 100 mW RL = 8 FREQUENCY (Hz) 100 1,000 10,000 0.01 0.1 THD+N (%) THD+N VP = 3 V Pout = 250 mW RL = 8 1 FREQUENCY (Hz) THD+N (%) FREQUENCY (Hz) 100 1,000 10,000 0.01 0.1 1 THD+N (%) THD+N VP = 2.5 V Pout = 100 mW RL = 4 FREQUENCY (Hz) 100 1,000 10,000 0.01 0.1 1 THD+N (%) THD+N VP = 3 V...

NCP2991 http://onsemi.com 6 TYPICAL CHARACTERISTICS Figure 9. THD+N vs. Frequency Figure 10. THD+N vs. Frequency FREQUENCY (Hz) 100 1,000 10,000 0.001 0.1 1 Figure 11. THD+N vs. Frequency Figure 12. THD+N vs. Frequency Figure 13. THD+N vs. Frequency Figure 14. THD+N vs. Frequency THD+N (%) THD+N VP = 2.5 V Pout = 100 mW RL = 8 Differential Input FREQUENCY (Hz) 100 1,000 10,000 0.001 0.1 THD+N (%) 1 FREQUENCY (Hz) 100 1,000 10,000 0.01 0.1 1 THD+N (%) THD+N VP = 5 V Pout = 500 mW RL = 8 Differential Input THD+N (%) 100 1,000 10,000 0.01 0.1 1 FREQUENCY (Hz) THD+N VP = 2.5 V Pout = 100 mW RL...

NCP2991 http://onsemi.com 7 TYPICAL CHARACTERISTICS Figure 15. THD+N vs. Pout Pout (mW) 0 400 1200 0.01 0.1 10 Figure 16. THD+N vs. Pout Figure 17. PSRR vs. Frequency Figure 18. PSRR vs. Frequency THD (%) RL = 8 Pout (mW) 0 500 1000 0.001 0.1 100 THD (%) THD+N RL = 8 Differential Input FREQUENCY (Hz) PSRR (dB) 1 10 0.01 1500 2000 2500 Vp = 2.5 V 2.7 V 3.0 V 3.3 V 3.6 V 5.0 V 5.5 V 1 800 1600 2000 Vp = 2.5 V 4.2 V 3.0 V 3.3 V 3.6 V 5.0 V 5.5 V FREQUENCY (Hz) 10 100 100,000 -120 -80 0 PSRR (dB) PSRR VP = 3 V G = 2 Input Shorted to GND Differential Configuration -100 -60 -40 -20 1,000 10,000...