LM48580TLX/NOPB - NATIONAL SEMICONDUCTOR

LM48580

LM48580 High Efficiency Class H, High Voltage, Haptic Piezo Actuator /

Ceramic Speaker Driver

Literature Number: SNAS491

LM48580 February 23, 2010

High Efficiency Class H, High Voltage, Haptic Piezo

Actuator / Ceramic Speaker Driver

General Description

The LM48580 is a fully differential, high voltage driver for

piezo actuators and ceramic speakers for portable multi-me-

dia devices. Part of National’s Powerwise product line, the

LM48580’s Class H architecture offers significant power sav-

ings compared to traditional Class AB amplifiers. The device

provides 30VP-P output drive while consuming just 15mW of

quiescent power.

The LM48580 is a single supply driver with an integrated

boost converter which allows the device to deliver 30VP-P from

a single 3.6V supply.

The LM48580 has three pin-programmable gain settings and

a low power Shutdown mode that reduces quiescent current

consumption to 0.1µA. The LM48580 is available in an ultra-

small 12-bump micro SMD package (1.46mm x 1.97mm).

Key Specifications

■ Output Voltage at VDD = 3.6V

RL = 6μF+10Ω, THD+N ≤ 1% 30VP-P (typ)

■ Quiescent Power Supply current

at 3.6V 2.7mA (typ)

■ Power Dissipation at 25VP-P 800mW (typ)

■ Shutdown current 0.1μA (typ)

Features

■Class H Driver

■Integrated Boost Converter

■Bridge-tied Load Output

■Differential Input

■Three Pin-Programmable Gains

■Low Supply Current

■Minimum external components

■Micro-power shutdown

■Thermal overload protection

■Available in space-saving 12-bump microSMD package

Applications

■Touch screen Smart Phones

■Tablet PCs

■Portable Electronic Devices

■MP3 Players

Typical Application

30108070

FIGURE 1. Typical Application Circuit

Boomer® is a registered trademark of National Semiconductor Corporation.

LM48580 High Efficiency Class H, High Voltage, Haptic Piezo Actuator / Ceramic Speaker Driver

Connection Diagrams

TL Package

1.46mm x 1.97mm x 0.6mm

30108071

Top View

Order Number LM48580TL

See NS Package Number TLA12Z1A

12–Bump micro SMD Marking

30108072

Top View

XY = Date code

TT = Die traceability

G = Boomer Family

M3 = LM48580TL

TLA12 Package View (Bumps Up)

30108031

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LM48580

Ordering Information

Ordering Information Table

Order

Number Package

Package

Drawing

Number

Transport Media MSL Level Green Status

LM48580TL 12 Bump µSMD TLA12Z1A 250 units on tape and reel 1 RoHS & no Sb/Br

LM48580TLX 12 Bump µSMD TLA12Z1A 3000 units on tape and reel 1 RoHS & no Sb/Br

Pin Descriptions

TABLE 1. Bump Descriptions

Bump Name Description

A1 OUT+ Amplifier Non-Inverting Output

A2 SGND Amplifier Ground

A3 IN+ Amplifier Non-Inverting Input

B1 OUT- Amplifier Inverting Output

B2 GAIN

Gain Select:

GAIN = float: AV = 18dB

GAIN = GND: AV = 24dB

GAIN = VDD: AV = 30dB

B3 IN- Amplifier Inverting Input

C1 VAMP Amplifier Supply Voltage. Connect to VBST

C2 SHDN Active Low Shutdown. Drive SHDN low to disable device.

Connect SHDN to VDD for normal operation.

C3 VDD Power Supply

D1 VBST Boost Converter Output

D2 SW Boost Converter Switching Node

D3 PGND Boost Converter Ground

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LM48580

Absolute Maximum Ratings (Note 1, Note

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Supply Voltage (Note 1) 6V

SW Voltage 25V

VBST Voltage 21V

VAMP 17V

Input Voltage −0.3V to VDD + 0.3V

Power Dissipation (Note 3) Internally limited

ESD Rating, Human Body Model

(Note 4) 2kV

ESD Rating, Machine Model

(Note 5) 150V

ESD Rating, Charge Device Model

(Note 6) 750V

Storage Temperature −65°C to + 150°C

Junction Temperature 150°C

Thermal Resistance

θJA (TLA12Z1A) 64 °C/W

Soldering Information

See AN-1112 "Micro SMD Wafer Level Chip

Scale Package."

Operating Ratings

Temperature Range

TMIN ≤ TA ≤ TMAX (Note 10) −40°C ≤ TA ≤ +85°C

Supply Voltage

VDD 2.5V ≤ VDD ≤ 5.5V

Electrical Characteristics VDD = 3.6V (Note 1, Note 2)

The following specifications apply for RL = 6μF + 10Ω, CBST = 1μF, CIN = 0.47μF, AV = 24dB unless otherwise specified. Limits

apply for TA = 25°C.

Symbol Parameter Conditions

LM48580 Units

(Limits)

Min

(Note 8)

Typ

(Note 7)

Max

(Note 8)

VDD Supply Voltage Range 2.5 5.5 V

IDD Quiescent Power Supply Current

VIN = 0V, RL = ∞

VDD = 3.6V 2.7 4 mA

VDD = 3V 3 mA

PDPower Consumption

VOUT = 25P-P, f = 200Hz

VDD = 3.6V 800 mW

VDD = 3V 830 mW

ISD Shutdown Current Shutdown Enabled 0.5 2 µA

TWU Wake-up Time From Shutdown 1 1.4 1.6 ms

VOS Differential Output Offset Voltage VDD = 3.6V 63 360 mV

AVGain

GAIN = FLOAT

GAIN = GND

GAIN = VDD

17.5

23.5

29.5

18.5

24.5

30.5

RIN Input Resistance 46 52 58 kΩ

RIN Gain Input Resistance to GND

to VDD

575

131

kΩ

VIN Maximum Input Voltage Range AV = 18dB 3 VP-P

VOUT Output Voltage

f = 200Hz, THD+N = 1%

VDD = 3.6V

VDD = 3V 25

30.5

VP-P

f = 2kHz, THD+N = 5%

VDD = 3.6V

VDD = 3V

8.5

VP-P

THD+N Total Harmonic Distortion + Noise VOUT = 25VP-P, f = 200Hz 0.16 %

PSRR Power Supply Rejection Ratio

(Figure TBD)

VDD = 3.6V + 200mVp-p sine, Inputs AC GND

fRIPPLE = 217Hz,

fRIPPLE = 1kHz 75

CMRR Common Mode Rejection Ratio

(Figure TBD)

VCM = 200mVP-P sine

fRIPPLE = 217Hz

fRIPPLE = 1kHz 56

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LM48580

Symbol Parameter Conditions

LM48580 Units

(Limits)

Min

(Note 8)

Typ

(Note 7)

Max

(Note 8)

fSW

Boost Converter Switching

Frequency 2.1 MHz

ILIMIT Boost Converter Current Limit 1100 mA

VIH Logic High Input Threshold SHDN 1.2 V

VIL Logic Low Input Threshold SHDN 0.45 V

IIN Input Leakage Current SHDN 0.1 1 μA

Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur, including inoperability and degradation of device reliability

and/or performance. Functional operation of the device and/or non-degradation at the Absolute Maximum Ratings or other conditions beyond those indicated in

the Recommended Operating Conditions is not implied. The Recommended Operating Conditions indicate conditions at which the device is functional and the

device should not be operated beyond such conditions. All voltages are measured with respect to the ground pin, unless otherwise specified.

Note 2: The Electrical Characteristics tables list guaranteed specifications under the listed Recommended Operating Conditions except as otherwise modified

or specified by the Electrical Characteristics Conditions and/or Notes. Typical specifications are estimations only and are not guaranteed.

Note 3: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX, θJA, and the ambient temperature, TA. The maximum

allowable power dissipation is PDMAX = (TJMAX − TA) / θJA or the given in Absolute Maximum Ratings, whichever is lower.

Note 4: Human body model, applicable std. JESD22-A114C.

Note 5: Machine model, applicable std. JESD22-A115-A.

Note 6: Charge device model, applicable std. JESD22-C101-C.

Note 7: Typical values represent most likely parametric norms at TA = +25ºC, and at the Recommended Operation Conditions at the time of product

characterization and are not guaranteed.

Note 8: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.

30108073

FIGURE 2. PSRR Test Circuit

30108074

FIGURE 3. CMRR Test Circuit

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LM48580

Typical Performance Characteristics

THD+N vs Frequency

VDD = 3.6V, VOUT = 9VP-P

RL = 6μF + 10Ω

30108011

THD+N vs Frequency

VDD = 4.2V, VOUT = 10VP-P

RL = 6μF + 10Ω

30108012

Output Voltage vs Frequency

VDD = 3.6V, THD+N = 5%

RL = 6μF + 10Ω

30108013

Output Voltage vs Frequency

VDD = 4.2V, THD+N = 5%

RL = 6μF + 10Ω

30108014

THD+N vs Output Voltage

VDD = 3.6V, RL = 6μF + 10Ω

30108009

THD+N vs Output Voltage

VDD = 4.2V, RL = 6μF + 10Ω

30108010

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LM48580

Power Consumption vs Output Voltage

VDD = 3.6V, RL = 6μF + 10Ω

30108015

Power Consumption vs Output Voltage

VDD = 4.2V, RL = 6μF + 10Ω

30108016

Output Voltage vs Supply Voltage

RL = 6μF + 10Ω, f = 200Hz

30108017

PSRR vs Frequency

VDD = 3.6V, VRIPPLE = 200mVP-P

RL = 6μF + 10Ω, f = 200Hz

30108019

CMRR vs Frequency

VDD = 3.6V, VCM = 1VP-P

RL = 6μF + 10Ω

30108019

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LM48580

Application Information

GENERAL AMPLIFIER FUNCTION

The LM48580 is a fully differential, Class H ceramic element

driver for ceramic speakers and haptic actuators. The inte-

grated, high efficiency boost converter dynamically adjusts

the amplifier’s supply voltage based on the output signal, in-

creasing headroom and improving efficiency compared to a

conventional Class AB driver. The fully differential amplifier

takes advantage of the increased headroom and bridge-tied

load (BTL) architecture, delivering significantly more voltage

than a single-ended amplifier.

CLASS H OPERATION

Class H is a modification of another amplifier class (typically

Class B or Class AB) to increase efficiency and reduce power

dissipation. To decrease power dissipation, Class H uses a

tracking power supply that monitors the output signal and ad-

justs the supply accordingly. When the amplifier output is

below 3VP-P, the nominal boost voltage is 6V. As the amplifier

output increases above 3VP-P, the boost voltage tracks the

amplifier output as shown in Figure 4. When the amplifier out-

put falls below 3VP-P, the boost converter returns to its nom-

inal output voltage. Power dissipation is greatly reduced

compared to conventional Class AB drivers.

30108021

FIGURE 4. Class H Operation

PROPERTIES OF PIEZOELECTRIC ELEMENTS

Piezoelectric elements such as ceramic speakers or piezo-

electric haptic actuators are capacitive in nature. Due to their

capacitive nature, piezoelectric elements appear as low

impedance loads at high frequencies (typically above 5kHz).

A resistor in series with the piezoelectric element is required

to ensure the amplifier does not see a short at high frequen-

cies.

The value of the series resistor depends on the capacitance

of the element, the frequency content of the output signal, and

the desired frequency response. Higher valued resistors min-

imize power dissipation at high frequencies, but also impacts

the frequency response. This configuration is ideal for use

with haptic actuators, where the majority of the signal content

is typically below 2kHz. Conversely, lower valued resistors

maximize frequency response, while increasing power dissi-

pation at high frequency. This configuration is ideal for ce-

ramic speaker applications, where high frequency audio

content needs to be reproduced. Resistor values are typically

between 10Ω and 20Ω.

DIFFERENTIAL AMPLIFIER EXPLANATION

The LM48580 features a fully differential amplifier. A differ-

ential amplifier amplifies the difference between the two input

signals. A major benefit of the fully differential amplifier is the

improved common mode rejection ratio (CMRR) over single

ended input amplifiers. The increased CMRR of the differen-

tial amplifier reduces sensitivity to ground offset related noise

injection, especially important in noisy systems.

THERMAL SHUTDOWN

The LM48580 features thermal shutdown that protects the

device during thermal overload conditions. When the junction

temperature exceeds +160°C, the device is disabled. The

LM48580 remains disabled until the die temperature falls be-

low the +160°C and SHDN is toggled.

GAIN SETTING

The LM48580 features three internally configured gain set-

tings 18, 24, and 30dB. The device gain is selected through

a single pin (GAIN). The gain settings are shown in Table 2.

TABLE 2. Gain Setting

Gain Gain Setting

FLOAT 18dB

GND 24dB

VDD 30dB

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LM48580

SHUTDOWN FUNCTION

The LM48580 features a low current shutdown mode. Set

SD = GND to disable the amplifier and boost converter and

reduce supply current to 0.01µA.

SINGLE-ENDED INPUT CONFIGURATION

The LM48580 is compatible with single-ended sources. When

configured for single-ended inputs, input capacitors must be

used to block and DC component at the input of the device.

Figure 5 shows the typical single-ended applications circuit.

30108022

FIGURE 5. Single-Ended Configuration

PROPER SELECTION OF EXTERNAL COMPONENTS

Boost Converter Capacitor Selection

The LM48580 boost converter requires three external capac-

itors for proper operation: a 1μF supply bypass capacitor, and

1μF + 100pF output reservoir capacitors. Place the supply

bypass capacitor as close to VDD as possible. Place the reser-

voir capacitors as close to VBST and VAMP as possible. Low

ESR surface-mount multi-layer ceramic capacitors with X7R

or X5R temperature characteristics are recommended. Select

output capacitors with voltage rating of 25V or higher. Tanta-

lum, OS-CON and aluminum electrolytic capacitors are not

recommended. See Table 4 for suggested capacitor manu-

facturers.

BOOST CONVERTER OUTPUT CAPACITOR SELECTION

Inductor Selection

The LM48580 boost converter is designed for use with a

4.7μH inductor. Table 3 lists various inductors and their man-

ufacturers. Choose an inductor with a saturation current rating

greater than the maximum operating peak current of the

LM48580 (> 1A). This ensures that the inductor does not sat-

urate, preventing excess efficiency loss, over heating and

possible damage to the inductor. Additionally, choose an in-

ductor with the lowest possible DCR (series resistance) to

further minimize efficiency losses.

TABLE 3. Recommended Inductors

MANUFACTURER PART# INDUCTANCE/

ISAT

Taiyo Yuden BRL3225T4R7M 4.7µH/1.1A

Coilcraft LP3015 4.7µH/1.1A

Diode Selection

Use a Schottkey diode as shown in Figure 1. A 20V diode

such as the NSR0520V2T1G from On Semiconductor is rec-

ommended. The NSR0520V2T1G is designed to handle a

maximum average current of 500mA.

PCB LAYOUT GUIDELINES

Minimize trace impedance of the power, ground and all output

traces for optimum performance. Voltage loss due to trace

resistance between the LM48580 and the load results in de-

creased output power and efficiency. Trace resistance be-

tween the power supply and ground has the same effect as a

poorly regulated supply, increased ripple and reduced peak

output power. Use wide traces for power supply inputs and

amplifier outputs to minimize losses due to trace resistance,

as well as route heat away from the device. Proper grounding

improves audio performance, minimizes crosstalk between

channels and prevents switching noise from interfering with

the audio signal. Use of power and ground planes is recom-

mended.

Place all digital components and route digital signal traces as

far as possible from analog components and traces. Do not

run digital and analog traces in parallel on the same PCB lay-

er. If digital and analog signal lines must cross either over or

under each other, ensure that they cross in a perpendicular

fashion.

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LM48580

Demoboard Bill of Materials

TABLE 4. Demoboard Bill of Materials

DESIGNATOR QUANTITY DESCRIPTION

C1 1

10µF ±10% 16V

Tantalum Capacitor (B Case)

AVX TPSB106K016R0800

C2 1

1µF ±10% 16V X5R

Ceramic Capacitor (603)

Panasonic ECJ-1VB1C105K

Murata GRM188R61C105KA93D

C3 1

1µF ±10% 25V X5R

Ceramic Capacitor (603)

Panasonic ECJ-1VB1E105K

Murata GRM188R61E105KA12D

C4 1

100pF ±5% 50V C0G

Ceramic Capacitor (603)

Panasonic ECJ-1VC1H101J

Murata GRM1885C1H101JA01D

C5, C6 2

4.7µF ±10% 10V X5R

Ceramic Capacitor (603)

Panasonic ECJ-1VB1A474K

Murata GRM188R61A474KA61D

C7 1

0.1µF ±10% 50V X7R

Ceramic Capacitor (603)

Panasonic ECJ-1VB1H104K

Murata GRM188R71H104KA93D

C8 UNSTUFFED

D1 1

20V, 500mA

Schottky Diode (SOD-523)

ON Semiconductor NSR0520V2T1G

L1 1 4.7µH ±20% 1.1A Inductor

Taiyo Yuden BRL3225T4R7M

JU1, JU2 2 3-Pin Header

LM48580TL 1 LM48580TL (12-Bump microSMD)

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LM48580

Demo Board Schematic

30108006

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LM48580

PC Board Layout

30108008

Top Silk Screen 30108007

Top Layer

30108003

Layer 2

30108005

Layer 3

30108002

Bottom Silkscreen

30108001

Bottom Layer

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LM48580

Revision History

Rev Date Description

1.0 02/23/10 Initial released.

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LM48580

Physical Dimensions inches (millimeters) unless otherwise noted

Thin micro SMD

Order Number LM48580TL

NS Package Number TLA12Z1A

X1 = 1.463±0.03mm X2 = 1.970±0.03mm X3 = 0.600±0.075mm

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LM48580

Notes

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LM48580

Notes

LM48580 High Efficiency Class H, High Voltage, Haptic Piezo Actuator / Ceramic Speaker Driver

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