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PDF LP3952 Data sheet ( Hoja de datos )
| Número de pieza | LP3952 | |
| Descripción | 6-Channel Color LED Driver | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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July 2007
www.DataSheet4U.com
LP3952
6-Channel Color LED Driver with Audio Synchronization
General Description
LP3952 is a color LED driver for battery powered handheld
devices. It drives any color LEDs including RGB LEDs, indi-
cator LEDs and keypad backlight LEDs. The boost DC-DC
converter drives high current loads with high efficiency. The
stand-alone command based RGB controller is feature rich
and easy to configure. Different lighting patterns and blinking
sequences can be programmed to driver registers. Built-in
audio synchronization feature allows user to synchronize the
color LEDs to audio signal. LED lighting can be controlled ei-
ther by audio signal amplitude or frequency. There are many
controls available for audio synchronization to get desired
lighting effect, including gain, speed, and different filter set-
tings. The flexible I2C interface allows easy control of LP3952.
LED outputs can be also controlled with external PWM signal.
Small micro SMDxt package together with minimum number
of external components is a best fit for handheld devices.
Features
■ Constant current and PWM controlled color LED drivers
■ Maximum current 40mA / output in constant current mode,
supports also switch mode control with 50 mA maximum
current / output
■ Complete audio synchronization for color/RGB LEDs with
amplitude, frequency and speed optimization
■ Command based lighting pattern generator for RGB LEDs
■ Programmable ON/OFF blinking sequences for RGB1
outputs
■ High efficiency Boost DC-DC converter with
programmable VOUTand fSW
■ I2C compatible interface
■ Possibility for external PWM dimming control
■ Small package – 36-bump micro SMDxt, 3.0 x 3.0 x 0.65
mm
Applications
■ Cellular Phones
■ PDAs, MP3 players
Typical Applications
© 2007 National Semiconductor Corporation 300238
30023871
www.national.com
1 page  
Electrical Characteristics (Notes 2, 10)
www.DataSheet4U.com
Limits in standard typeface are for TJ = 25°C. Limits in boldface type apply over the operating ambient temperature range (-30°C
< TA < +85°C). Unless otherwise noted, specifications apply to the LP3952 Block Diagram with: VDD1 = VDD2 = 3.6V, VDDIO = 2.8V,
CVDD = CVDDIO = 100 nF, COUT = CIN = 10 μF, CVDDA = 1 μF, CREF = 100 nF, L1 = 4.7 μH, RRGB = 5.6 kΩ and RRT = 82 kΩ (Note
11).
Symbol
Parameter
Condition
Min Typ Max Units
IVDD Standby supply current NSTBY (bit) = L, NRST (pin) = H
(VDD1 + VDD2)
SCL=H, SDA = H
No-boost supply current NSTBY (bit) = H,
(VDD1 + VDD2)
EN_BOOST(bit) = L
SCL = H, SDA = H
Audio sync and LEDs OFF
1 8 μA
450 μA
No-load supply current
(VDD1 + VDD2)
NSTBY (bit) = H,
EN_BOOST (bit) = H
SCL = H, SDA = H
Audio sync and LEDs OFF
Autoload OFF
1 mA
IVDD
IVDDIO
RGB drivers
(VDD1 + VDD2)
Audio synchronization
(VDD1 + VDD2)
VDDIO Standby Supply
current
CC mode at R1, G1, B1 and R2, G2, B2 set to 15 mA
SW mode
Audio sync ON
VDD1,2 = 2.8V
VDD1,2 = 3.6V
NSTBY (bit)=L
SCL = H, SDA = H
150
150
390
700
1
μA
μA
μA
IEXT_LDO
VDDA
External LDO output 7V tolerant application only
current
(VDD1, VDD2, VDDA)
IBOOST = 300 mA
Output voltage of internal (Note 12)
LDO for analog parts
6.5 mA
2.72 2.80 2.88
-3 +3
V
%
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the component may occur. Operating Ratings are conditions under which operation
of the device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions,
see the Electrical Characteristics tables.
Note 2: All voltages are with respect to the potential at the GND pins.
Note 3: Battery/Charger voltage should be above 6V no more than 10% of the operational lifetime.
Note 4: Voltage tolerance of LP3952 above 6.0V relies on fact that VDD1 and VDD2 (2.8V) are available (ON) at all conditions. If VDD1 and VDD2 are not available
(ON) at all conditions, National Semiconductor does not guarantee any parameters or reliability for this device.
Note 5: Internal thermal shutdown circuitry protects the device from permanent damage. Thermal shutdown engages at TJ=160°C (typ.) and disengages at
TJ=140°C (typ.).
Note 6: For detailed soldering specifications and information, please refer to National Semiconductor Application Note AN1412 : Micro SMDxt Wafer Level Chip
Scale Package
Note 7: The Human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin.
Note 8: In applications where high power dissipation and/or poor package thermal resistance is present, the maximum ambient temperature may have to be
derated. Maximum ambient temperature (TA-MAX) is dependent on the maximum operating junction temperature (TJ-MAX-OP = 125°C), the maximum power
dissipation of the device in the application (PD-MAX), and the junction-to ambient thermal resistance of the part/package in the application (θJA), as given by the
following equation: TA-MAX = TJ-MAX-OP – (θJA × PD-MAX).
Note 9: Junction-to-ambient thermal resistance is highly application and board-layout dependent. In applications where high maximum power dissipation exists,
special care must be paid to thermal dissipation issues in board design.
Note 10: Min and Max limits are guaranteed by design, test, or statistical analysis. Typical numbers are not guaranteed, but do represent the most likely norm.
Note 11: Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) used in setting electrical characteristics.
Note 12: VDDA output is not recommended for external use.
5 www.national.com
5 Page 
Boost Load Transient, 50 mA–100 mA
Boost Switching Frequenwcwyw.DataSheet4U.com
30023816
Output Voltage vs Load Current
30023817
Efficiency at Low Load vs Autoload
30023861
30023862
11 www.national.com
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LP3952.PDF ] | |
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