MAS6240 Micro Analog systems, MAS6240 Datasheet

MAS6240

Manufacturer Part Number

MAS6240

Description

Piezo Driver

Manufacturer

Micro Analog systems

Datasheet

1.MAS6240.pdf (10 pages)

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Manufacturer

Quantity

Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

MAS6240A

Manufacturer:

MAS-OY

Quantity:

20 000

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DESCRIPTION

MAS6240 is a piezo driver device that can drive

outputs up to 18Vpp from 3V supply. An internal

three-mode charge pump generates boosted supply

voltage for piezo driver. For adjusting the piezo

element sound volume, the charge pump can

operate in either of a 1x, 2x or 3x mode. In 1x mode

the input voltage is bypassed to the output, in 2x or

3x mode the input voltage is boosted up accordingly

2 or 3 times. Charge pump mode is selected by

control pins EN1 and EN2 (see Table1 at page 2).

MAS6240 is an easy and low-cost solution for piezo

driver, since only 4 small value capacitors are

needed in addition to sound element - the use of

inductors can be avoided. The inductorless design

also causes significantly less disturbance to the

surrounding circuits making it an ideal choice for

sensitive designs. Its charge pump switches at

1MHz, allowing to use as small as 100nF external

capacitors.

FEATURES

Thin 0.75 mm QFN 12 package

Piezo Driver

• Three-Step Volume Adjusting

• Both Single Ended and Differential Output

• Up to 18Vpp Output from 3V Supply

• One Wire Audio & Shutdown Control

Charge Pump

• Low External Part Count

• Solution without Inductors

• 1 MHz Switching Frequency

• Multi-Mode Charge Pump (1x/2x/3x)

This is preliminary information on a new

product under development. Micro Analog

Systems Oy reserves the right to make any

changes without notice.

Piezo Driver with Multi-Mode Charge Pump

• Both Single Ended and

• Three-Step Volume Adjusting

• Up to 18Vpp Output from 3V

• One Wire Audio & Shutdown

• High Efficiency

• Solution without Inductors

• Low External Part Count

Differential Output

Supply

Control

Control logic is switching the charge pump on at

first rising signal of digital input (DIN) pin. The

switch-off signal will be generated while the signal at

DIN has been low at least for 10ms. The piezo

driver is enabled at a second rising edge of a pulse

at DIN and the signal is transferred to piezo output

VO1. The same signal is inverted into output VO2

for using differential output.

Continuous logic high level at DIN input causes the

charge pump to be turned ON but leaves the audio

amplifier disabled. In that state the charge pump

output can be used to power the external LEDs or

any other external circuit. The output voltage is still

selectable at three steps.

In "disabled" mode (DIN has been low for 10ms) all

functional blocks are switched off to achieve the

quiescent current less than 1µA.

See more information in the chapter Detailed

Description.

APPLICATIONS

•Wrist Watches

•Alarm Clocks

•Handheld GPS devices

•PDAs

•Portable Device with Sound Feature

MAS6240

20 November 2006

DA6240.001

1 (10)

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MAS6240 Summary of contents

Page 1

... Micro Analog Systems Oy reserves the right to make any changes without notice. DESCRIPTION MAS6240 is a piezo driver device that can drive outputs up to 18Vpp from 3V supply. An internal three-mode charge pump generates boosted supply voltage for piezo driver. For adjusting the piezo element sound volume, the charge pump can operate in either mode ...

Page 2

BLOCK & APPLICATION DIAGRAM VIN (3V) 0.1uF Figure 1: Charge Pump + Single End Piezo Driver (max 9Vpp) 0.1uF Figure 2: Charge Pump + Differential Piezo Driver (max 18Vpp) Table 1 Charge Pump boosting mode selection DIN EN1 0 - ...

Page 3

PIN DESCRIPTION Pin Description Control signal input for setting charge pump mode Control signal input for setting charge pump mode Enable signal + Digital signal input Flying capacitor negative terminal Supply ground Digital audio signal output Digital audio signal output ...

Page 4

ELECTRICAL CHARACTERISTICS T = -40° +85° C, typical values 27° Parameter Symbol Output Voltage VOUT Current Consumption I CC Signal Frequency F AUDIO Shutdown Current I SD Internal Switching F OSC ...

Page 5

... DIN pin. If only one continous pulse is fed to the input DIN, the output VO1 is not enabled. This make it possible to control e.g. a white LED or other device through pin VOUT while charge pump is enabled, without enabling the piezo output VO1. MAS6240 first pulse skipping & power down delay 10 8 ...

Page 6

... IC OUTLINES EN1 EN2 DIN MAS6240 DIE size = 1.13 x 1.20 mm; PAD size = µm DEVICE OUTLINE CONFIGURATION Pin nr. Pin Name Pin nr. 1 EN1 4 2 EN2 5 3 DIN 6 1130 µ µ µ µ m QFN 3x3 12ld 7 1234 10 GAv 4 YWW 1 Top Marking Information: 1234 = Product Number ...

Page 7

PACKAGE (QFN 3X3x0.75 12ld) OUTLINE D TOP VIEW PIN 1 MARK AREA SIDE VIEW L SHAPE OF PIN #1 IDENTIFICATION IS OPTIONAL BOTTOM VIEW DETAIL A Symbol Min A 0.700 A1 0.000 A3 0.178 b 0.180 D 2.950 D2 (Exposed.pad) ...

Page 8

SOLDERING INFORMATION N For Lead-Free / Green QFN 3mm x 3mm x 0.75mm Resistance to Soldering Heat Maximum Temperature Maximum Number of Reflow Cycles Reflow profile Lead Finish EMBOSSED TAPE SPECIFICATIONS 0.25 typ A ...

Page 9

REEL SPECIFICATIONS A D End Trailer Dimension (measured at hub (measured at hub) 2 Trailer Leader of which minimum 160 mm of empty carrier tape sealed with Tape Slot for Tape Start ...

Page 10

... Product Code Product MAS6240A1HP06 Piezo Driver with Multi-Mode Charge Pump MAS6240A1TC00 Piezo Driver with Multi-Mode Charge Pump The formation of product code An example for MAS6240A1HP06: MAS6240 A Product name Design version LOCAL DISTRIBUTOR MICRO ANALOG SYSTEMS OY CONTACTS Micro Analog Systems Oy Kamreerintie 2, P.O.Box 51 FIN-02771 Espoo, FINLAND ...

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