MP7705 datasheet(3/10 Pages) MPS

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MP7705 – 12V, 2x5W/2x2.5W CLASS–D STEREO SINGLE ENDED AUDIO AMPLIFIER

MP7705 Rev. 1.1

www.MonolithicPower.com

9/18/2009

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

OPERATING SPECIFICATIONS

Circuit of Figure 1, VDD = 12V, VEN = 5V, TA = +25°C, unless otherwise noted.

Parameters

Symbol Condition

Min

Typ

Max

Units

Power Output

f = 1KHz, THD+N = 10%,

8Ω Load

2.5

THD+ Noise

POUT = 1W, f = 1KHz, 8Ω

Load

0.06

Efficiency

f = 1KHz, POUT = 1W, 8Ω

Load

Maximum Power Bandwidth

KHz

Dynamic Range

Noise Floor

A-Weighted

190

μV

Power Supply Rejection

f = 1KHz

PIN FUNCTIONS

Pin #

Name

Description

1, 5,

11, 16

No Connect. Not internally connected

REF1

Amplifier 1 Reference. REF1 is the reference point for amplifier 1. Use a resistive voltage

divider to set the voltage at REF1 to VDD/2.

IN1

Amplifier 1 Input. IN1 is the inverting input for amplifier 1.

AGND1 Analog Ground 1. Connect AGND1 to AGND2.

EN1

Enable Input 1. EN1 must be connected to EN2. Drive EN1 high to enable MP7705; low to

disable it.

IN2

Amplifier 2 Input. IN2 is the inverting input for amplifier 2.

REF2

Amplifier 2 Reference. REF2 is the reference point for amplifier 2. Use a resistive voltage

divider to set the voltage at REF1 to VDD/2.

AGND2 Analog Ground 2. Connect AGND2 to AGND1.

EN2

Enable Input 2. EN2 must be connected to EN1. Drive high to enable MP7705, drive low to

disable.

BS2

High-Side MOSFET Bootstrap Input for Amplifier 2. A capacitor from BS2 to SW2 supplies

the gate drive current to the internal high-side MOSFET. Connect a 1μF capacitor from SW2

to BS2.

VDD2

Power Supply Input. Bypass VDD2 to PGND2 with a 1μF X7R capacitor (in addition to the

main bulk capacitor), placed close to the IC PIN13 and PIN15.

SW2

Switched Power Output. SW2 is the output of Amplifier 2. Connect the LC filter to this pin.

PGND2 Power Ground for Amplifier 2. Connect PGND2 to PGND1.

BS1

High-Side MOSFET Bootstrap Input for Amplifier 1. A capacitor from BS1 to SW1 supplies

the gate drive current to the internal high-side MOSFET. Connect a 1μF capacitor from SW1

to BS1. See Figure 1.

VDD1

Power Supply Input. Bypass VDD1 to PGND1 with a 1μF X7R capacitor (in addition to the

main bulk capacitor), placed close to the IC PIN18 and PIN20.

SW1

Switched Power Output. SW1 is the output of Amplifier 1. Connect the LC filter to this pin.

See Figure 1.

PGND1 Power Ground for Amplifier 1. Connect PGND1 to PGND2. See Figure 1.

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