Datasheet

LM48511
SNAS416G –JULY 2007–REVISED MAY 2013 www.ti.com
Electrical Characteristics V
DD
= 5.0V
(1)(2)(3)
(continued)
The following specifications apply for V
DD
= 5.0V, PV
1
= 7.8V (continuos mode), A
V
= 2V/V, R
3
= 25.5kΩ, R
LS
= 4.87kΩ,
R
L
= 8Ω, f = 1kHz, SS/FF = GND, unless otherwise specified. Limits apply for T
A
= 25°C.
LM48511 Units
Symbol Parameter Conditions
(Limits)
Typical
(4)
Limit
(5)
V
RIPPLE
= 200mV
P-P
Sine,
f
RIPPLE =
= 217Hz,
FF 88 dB
SS 87 dB
V
RIPPLE
= 200mV
P-P
Sine,
Power Supply Rejection Ratio f
RIPPLE =
= 1kHz,
PSRR
(Input Referred) FF 88 dB
SS 85 dB
V
RIPPLE
= 200mV
P-P
Sine,
f
RIPPLE =
= 10kHz, dB
FF 77 dB
SS 76
Common Mode Rejection Ratio V
RIPPLE
= 1V
P-P
, f
RIPPLE
= 217Hz
CMRR 73 dB
(Input Referred)
η Efficiency f = 1kHz, R
L
= 8Ω, P
O
= 1W 80 %
V
FB
Feedback Pin Reference Voltage
(8)
1.23 V
(8) Feedback pin reference voltage is measured with the Audio Amplifier disconnected from the Boost converter (the Boost converter is
unloaded).
Electrical Characteristics V
DD
= 3.6V
(1)(2)(3)
The following specifications apply for V
DD
= 3.6V, PV1 = 7V (continuous mode), A
V
= 2V/V, R
3
= 25.5kΩ, R
LS
= 5.36kΩ,
R
L
= 8Ω, f = 1kHz, SS/FF = GND, unless otherwise specified. Limits apply for T
A
= 25°C.
LM48511 Units
Symbol Parameter Conditions
(Limits)
Typical
(4)
Limit
(5)
V
IN
= 0, R
LOAD
= ∞
I
DD
Quiescent Power Supply Current Fixed Frequency Mode (FF) 16 mA (max)
Spread Spectrum Mode (SS) 17.5 26.6 mA (max)
V
SD_BOOST
= V
SD_AMP
= SS =
I
SD
Shutdown Current
(6)
0.03 1 μA (max)
FB_SEL = GND
V
IH
Logic Voltage Input High 0.96 1.4 V (min)
V
IL
Logic Voltage Input Low 0.84 0.4 V (min)
T
WU
Wake-up Time C
SS
= 0.1μF 50 ms
V
OS
Output Offset Voltage
(7)
0.04 mV
(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. TheRecommended 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.
(2) The Electrical Characteristics tables list ensured 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 ensured.
(3) R
L
is a resistive load in series with two inductors to simulate an actual speaker load for R
L
= 8Ω, the load is 15μH+8Ω+15μH. For
R
L
= 4Ω, the load is 15μH+4Ω+15μH.
(4) Typical values represent most likely parametric norms at T
A
= +25ºC, and at the Recommended Operation Conditions at the time of
product characterization and are not specified.
(5) Datasheet min/max specification limits are specified by test or statistical analysis.
(6) Shutdown current is measured with components R1 and R2 removed.
(7) Offset voltage is determined by: (I
DD (with load)
— I
DD (no load)
) x R
L
.
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