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LM4961LQ 데이터시트 PDF




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부품번호 LM4961LQ 기능
기능 Ceramic Speaker Driver
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LM4961LQ 데이터시트, 핀배열, 회로
October 2004
LM4961
Ceramic Speaker Driver
General Description
The LM4961 is an audio power amplifier primarily designed
for driving Ceramic Speaker for applications in Cell Phone
and PDAs. It integrates a boost converter, with variable
output voltage, with an audio power amplifier. It is capable of
driving 15Vp-p in BTL mode to 2uF+ 30 ohms load, continu-
ous average power, with less than 1% distortion (THD+N)
from a 3.2VDC power supply.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal number of
external components. The LM4961 does not require boot-
strap capacitors, or snubber circuits therefore it is ideally
suited for portable applications requiring high voltage output
to drive capacitive loads like Ceramic Speakers. The
LM4961 features a low-power consumption shutdown mode.
Additionally, the LM4961 features an internal thermal shut-
down protection mechanism.
The LM4961 contains advanced pop & click circuitry that
eliminates noises which would otherwise occur during
turn-on and turn-off transitions.
The LM4961 is unity-gain stable and can be configured by
external gain-setting resistors.
Key Specifications
n Quiescent Power Supply Current
n Voltage Swing in BTL at 1% THD
n Shutdown current
7mA (typ)
15Vp-p (typ)
0.1µA (typ)
Features
n Pop & click circuitry eliminates noise during turn-on and
turn-off transitions
n Low current shutdown mode
n Low quiescent current
n Mono 15Vp-p BTL output, RL = 2µF+30, f = 1kHz
n Thermal shutdown protection
n Unity-gain stable
n External gain configuration capability
n Including Band exchange SW
n Including Leakage cut SW
Applications
n Cellphone
n PDA
Connection Diagram
LM4961LQ (5x5)
Top View
Order Number LM4XXX
See NS Package Number
20094084
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation DS200940
www.national.com




LM4961LQ pdf, 반도체, 판매, 대치품
Electrical Characteristics VDD = 3.2V (Continued)
The following specifications apply for VDD = 3.2V, AV-BTL = 26dB, RL = 2µF+30, Cb = 1.0µF, Band-SW = VDD unless other-
wise specified. Limits apply for TA = 25˚C.
Symbol
Parameter
Conditions
LM4961
Units
Typical
Limit
(Limits)
(Note 6) (Notes 7, 8)
VLH
Logic High Threshold Voltage
For Shutdown 1, Shutdown 2, and
Band-SW
1.5 V (min)
VLL
Logic Low Threshold Voltage
For Shutdown 1, Shutdown 2, and
Band-SW
0.4 V (max)
RPULLDOWN
TSD
Pulldown Resistor
Thermal Shutdown Temperature
For Shutdown 2 and Band-SW
70k 50k (min)
125 ˚C (min)
Vout
THD+N
eOS
Output Voltage Swing
Total Harmomic Distortion + Noise
Output Noise
THD = 1%, f = 1kHz
RL = 2µF+30Mono BTL
Vout = 14Vp-p, f = 1kHz
A-Weighted Filter, VIN = 0V (Note
10)
15
0.1
125
14 Vp-p (min)
1.0 % (max)
µV
PSRR
Power Supply Rejection Ratio
VRIPPLE = 200mVp-p, f = 100Hz
80
65 dB (min)
Ron-sw-out
On Resistance on SW-Out
Band SW “High” Isink = 100µA
170 220 (max)
(Between pin 1 and pin 28)
Note 1: All voltages are measured with respect to the GND pin, unless otherwise specified.
Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which
guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit
is given, however, the typical value is a good indication of device performance.
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. For the LM4961 typical application (shown
in Figure 1) with VDD = 4.2V, RL = 2µF+30mono BTL operation the maximum power dissipation is 232mW. θJA = 66˚C/W.
Note 4: Human body model, 100pF discharged through a 1.5kresistor.
Note 5: Machine Model, 220pF–240pF discharged through all pins.
Note 6: Typicals are measured at 25˚C and represent the parametric norm.
Note 7: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 8: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
Note 9: Shutdown current is measured in a normal room environment. The Shutdown pin should be driven as close as possible to GND for minimum shutdown
current.
Note 10: Noise measurements are dependent on the absolute values of closed loop gain setting resistors (input and feedback resistors).
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LM4961LQ 전자부품, 판매, 대치품
Typical Performance Characteristics (Continued)
Feedback Voltage vs
Temperature
Feedback Bias Current vs
Temperature
Max. Duty Cycle vs
Temperature - ”X”
20094097
RDS (ON) vs
Temperature
20094098
RDS (ON) vs
VDD
200940A0
200940A1
200940A2
7
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LM4961LQ

Ceramic Speaker Driver

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