LM4920TLBD National Semiconductor, LM4920TLBD Datasheet - Page 5

• Manufacturer Part Number: LM4920TLBD
• Description: BOARD EVALUATION LM4920TL
• Manufacturer: National Semiconductor
• Series: Boomer®r

Specifications of LM4920TLBD

• Amplifier Type: Class AB
• Output Type: Headphones, 2-Channel (Stereo)
• Max Output Power X Channels @ Load: 80mW x 2 @ 16 Ohm
• Voltage - Supply: 1.6 V ~ 4.2 V
• Operating Temperature: -40°C ~ 85°C
• Board Type: Fully Populated
• Utilized Ic / Part: LM4920
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Z
I
L
OUT
Electrical Characteristics V
The following specifications apply for V
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 that
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 T
allowable power dissipation is P
de-rating currents for more information.
Note 4: Human body model, 100pF discharged through a 1.5kΩ resistor.
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: If the product is in shutdown mode and V
circuits. If the source impedance limits the current to a max of 10mA, then the part will be protected. If the part is enabled when V
performance will be curtailed or the part may be permanently damaged.
Note 10: Human body model, 100pF discharged through a 1.5kΩ resistor.
Note 11: θ
Note 12: V
External Components Description
Components
Symbol
1.
2.
3.
4.
5.
JA
OUT
value is measured with the device mounted on a PCB with a 3” x 1.5”, 1oz copper heatsink.
C
C
C
C
C
1
2
3
4
refers to signal applied to the LM4920 outputs.
i
Output Impedance
Input Leakage
Input coupling capacitor which blocks the DC voltage at the amplifier’s input terminals. Also creates a
high-pass filter with R
an explanation of how to determine the value of C
Flying capacitor. Low ESR ceramic capacitor (≤100mΩ)
Output capacitor. Low ESR ceramic capacitor (≤100mΩ)
Tantalum capacitor. Supply bypass capacitor which provides power supply filtering. Refer to the Power Supply
Bypassing section for information concerning proper placement and selection of the supply bypass capacitor.
Ceramic capacitor. Supply bypass capacitor which provides power supply filtering. Refer to the Power Supply
Bypassing section for information concerning proper placement and selection of the supply bypass capacitor.
Parameter
DMAX
= (T
JMAX
- T
DD
DD
i
A
at f
) / θ
exceeds 4.2V (to a max of 4.5V V
= 3V and 16Ω load unless otherwise specified. Limits apply to T
C
JA
DD
= 1/(2πR
or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4920, see power
V
–500mV ≤ V
(Note 12)
SD-LC
= 3V
= V
i
C
i
). Refer to the section Proper Selection of External Components, for
SD-RC
(Note 1) (Continued)
(Figure 1)
OUT
Functional Description
Conditions
5
≤ +500mV
= GND
i
.
DD
), then most of the excess current will flow through the ESD protection
JMAX
, θ
JA
, and the ambient temperature, T
(Note 6)
±
Typ
0.1
8
LM4920
(Notes 7, 8)
Limit
A
DD
2
= 25˚C.
is above 4.5V, circuit
A
. The maximum
www.national.com
kΩ (min)
(Limits)
Units
nA