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PDF LP3954 Data sheet ( Hoja de datos )
| Número de pieza | LP3954 | |
| Descripción | Advanced Lighting Management Unit | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LP3954 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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July 2007
www.DataSheet4U.com
LP3954
Advanced Lighting Management Unit
General Description
LP3954 is an advanced lighting management unit for hand-
held devices. It drives any phone lights including display
backlights, RGB, keypad and camera flash LEDs. The boost
DC-DC converter drives high current loads with high efficien-
cy. White LED backlight drivers are high efficiency low voltage
structures with excellent matching and automatic fade in/ fade
out function. The new stand-alone command based RGB
controller is feature rich and easy to configure. Built-in audio
synchronization feature allows user to synchronize the color
LEDs to audio input. Integrated high current driver can drive
camera flash LED or motor/vibra. Internal ADC can be used
for ambient light or temperature sensing. The flexible SPI/I2C
interface allows easy control of LP3954. Small micro SMD
package together with minimum number of external compo-
nents is a best fit for handheld devices.
Features
■ Audio synchronization for color/RGB LEDs
■ Command based PWM controlled RGB LED drivers
■ High current driver for flash LED with built-in timing.
■ 4+2 or 6 low voltage constant current white LED drivers
with programmable 8-bit adjustment (0…25mA/LED)
■ High efficiency Boost DC-DC converter
■ SPI / I2C compatible interface
■ Possibility for external PWM dimming control
■ Possibility for clock synchronization for RGB timing
■ Ambient light and temperature sensing possibility
■ Small package – micro SMD or micro SMDxt, 3.0 x 3.0 x
0.6mm
Applications
■ Cellular Phones
■ PDAs, MP3 players
Typical Applications
© 2007 National Semiconductor Corporation 201322
20132260
www.national.com
1 page  
Electrical Characteristics (Notes 2, 11)
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 LP3954 Block Diagram with: VDD1 = VDD2 = 3.6V, VDDIO =
2.8V, CVDD = CVDDIO = 100nF, COUT = CIN = 10µF, CVDDA = 1µF, CREF = 100nF, L1 = 4.7µH, RFLASH =1.2k, RRGB =5.6k and RRT
=82k (Note 12).
Symbol
Parameter
Condition
Min Typ Max Units
IVDD Standby supply current
(VDD1, VDD2)
No-boost supply current
(VDD1, VDD2)
NSTBY = L
SCK, SS, SI
NSTBY = H,
EN_BOOST = L
SCK, SS, SI
Audio sync and LEDs OFF
1 8 µA
400 µA
No-load supply current
(VDD1, VDD2)
NSTBY = H,
EN_BOOST = H
SCK, SS, SI
Audio sync and LEDs OFF
Autoload OFF
1 mA
RGB drivers
(VDD1, VDD2)
CC mode at R1, G1, B1 and
R2, G2, B2 set to 15mA
SW mode
150
150
µA
WLED drivers
(VDD1, VDD2)
Audio synchronization
(VDD1, VDD2)
IVDDIO
Flash
(VDD1, VDD2)
VDDIO Standby Supply
current
4+2 banks IOUT/LED 25mA
Audio sync ON
VDD1,2 = 2.8V
VDD1,2 = 3.6V
I(RFLASH)=1mA
Peak current during flash
NSTBY = L
SCK, SS, SI = H
500 µA
390 µA
700
2 mA
1 µA
VDDIO supply current
IEXT_LDO
VDDA
External LDO output current
(VDD1, VDD2, VDDA)
Output voltage of internal
LDO for analog parts
1MHz SCK frequency in SPI
mode, CL = 50pF at SO pin
7V tolerant application only
IBOOST = 300mA
(Note 13)
2.72
-3
20
2.80
6.5
2.88
+3
µA
mA
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 LP3954 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: The total load current of the boost converter in worst-case conditions should be limited to 300mA (min. input and max. output voltage).
Note 6: 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 7: For detailed soldering specifications and information, please refer to National Semiconductor Application Note AN1112 : Micro SMD Wafer Level Chip
Scale Package or Application Note AN1412 : Micro SMDxt Wafer Level Chip Scale Package.
Note 8: The Human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin. The machine model is a 200pF capacitor discharged
directly into each pin. MIL-STD-883 3015.7
Note 9: 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 10: 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 11: 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 12: Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) used in setting electrical characteristics.
Note 13: 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
20132216
Output Voltage vs Load Current
20132217
Efficiency At Low Load vs Autoload
20132261
20132262
11 www.national.com
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LP3954.PDF ] | |
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