February 23, 2010
LM48580
High Efficiency Class H, High Voltage, Haptic Piezo
Actuator / Ceramic Speaker Driver
General Description
Features
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.
Class H Driver
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Integrated Boost Converter
Bridge-tied Load Output
Differential Input
Three Pin-Programmable Gains
Low Supply Current
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.
Minimum external components
Micro-power shutdown
Thermal overload protection
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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).
Available in space-saving 12-bump microSMD package
Applications
Touch screen Smart Phones
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Key Specifications
Tablet PCs
Portable Electronic Devices
■ꢀOutput Voltage at VDD = 3.6V
MP3 Players
RL = 6μF+10Ω, THD+N ≤ 1%
30VP-P (typ)
■ꢀQuiescent Power Supply current
at 3.6V
2.7mA (typ)
800mW (typ)
■ꢀPower Dissipation at 25VP-P
■ꢀShutdown current
0.1μA (typ)
Typical Application
30108070
FIGURE 1. Typical Application Circuit
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301080
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