National Semiconductor LM9022 Technical data
LM9022
Vacuum Fluorescent Display Filament Driver
LM9022 Vacuum Fluorescent Display Filament Driver
August 2005
General Description
The LM9022 is a bridged power amplifier capable of delivering typically 2W of continuous average power into a 10Ω
filament load when powered by a 5V power supply.
To conserve power in portable applications, the LM9022’s
micropower shutdown mode (I
when V
Additional LM9022 features include thermal shutdown protection, unity-gain stability, and external gain set.
is applied to the SHUTDOWN pin.
DD
Typical Application T
= 0.6µA, typ) is activated
Q
= 25˚C, VDD= 5V, unless otherwise specified.
A
Key Specifications
n IDDduring shutdown 0.6µA (typ)
n Thermal Shutdown Protection
Features
n No transformers required
n SO or DIP packaging
Applications
n VCR/DVD Displays
n RADIO/TUNER Displays
20021501
FIGURE 1. Typical Application Circuit
Connection Diagram
MSOP, Small Outline, and DIP Package
Top View
Order Number LM9022M or LM9022N
See NS Package Number M08A or N08E
© 2005 National Semiconductor Corporation DS200215 www.national.com
20021502
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
LM9022
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage -0.3V to +6.0V
Supply Temperature −65˚C to +150˚C
Input Voltage −0.3V to V
Power Dissipation (Note 3) Internally Limited
DD
+0.3V
Vapor Phase (60 sec.) 215˚C
Infrared (15 sec.) 220˚C
θ
(typ) —M08A 35˚C/W
JC
θ
(typ) — M08A 140˚C/W
JA
θ
(typ) — N08E 37˚C/W
JC
θ
(typ) — N08E 107˚C/W
JA
Operating Ratings
ESD Susceptibility (Note 4) 5000V
ESD Susceptibility (Note 5) 250V
Junction Temperature 150˚C
Soldering Information
Temperature Range
T
MIN
≤ TA≤ T
MAX
−40˚C ≤ TA≤ 85˚C
Supply Voltage 2.0V ≤ V
Small Outline Package
Electrical Characteristics (Notes 1, 2)
The following specifications apply for V
Limits apply for T
= 25˚C.
A
DD
= 5V, V
PIN3=VPIN2,VSHUTDOWN
Symbol Parameter Conditions
I
DD
Quiescent Power Supply
VIN= 0V, Io= 0A, V
SHUTDOWN
Current
Power Supply Current during
V
SHUTDOWN
=VDD(Note 8) 0.6 2 µA
shutdown
V
BP
V
OUT
Note 1: 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 2: All voltages are measured with respect to the ground pin, unless otherwise specified.
Note 3: The maximum power dissipation must be derated at elevated temperatures and is dictated by T
allowable power dissipation is P
For the θ
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 specified at 25˚C and represent the parametric norm.
Note 7: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level) by design, test, or statistical analysis.
Note 8: Both outputs are high impedance when in shutdown mode.
Bypass Pin Voltage VIN= 0V 2.4 2.5 2.6 V
Output Voltage Across R
=(T
’s for different packages, please see the Application Information section or the Absolute Maximum Ratings section.
JA
DMAX
RL=10Ω 3.6 4.3 V
L
R
=20Ω 4.2 4.6 V
L
)/θJAor the number given in Absolute Maximum Ratings, whichever is lower. For the LM9022, T
JMAX–TA
= 0V, and RL=10Ω unless otherwise specified.
LM9022
Min
(Note 7)
Typical
(Note 6)
Max
(Note 7)
= 0V 6.5 10.0 mA
, θJA, and the ambient temperature TA. The maximum
JMAX
JMAX
DD
≤ 5.5V
Units
= 150˚C.
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Typical Performance Characteristics
TA= 25˚C, VDD= 5V, unless otherwise specified.
Power Derating Curve Output Saturation Voltage
LM9022
vs Load
Open Loop
Frequency Response
Differential Output Voltage
vs Load
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20021519
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Supply Current
vs Supply Voltage
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20021540
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