LM48580 Datasheet, PDF (1/16 Pages) National Semiconductor (TI) – High Efficiency Class H, High Voltage, Haptic Piezo Actuator / Ceramic Speaker Driver

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 30V_P-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 30V_P-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 V_DD = 3.6V
R_L = 6μF+10Ω, THD+N ≤ 1%
■ Quiescent Power Supply current
at 3.6V
■ Power Dissipation at 25V_P-P
■ Shutdown current
30V_P-P (typ)
2.7mA (typ)
800mW (typ)
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
FIGURE 1. Typical Application Circuit
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