|
|
PDF LP39542 Data sheet ( Hoja de datos )
| Número de pieza | LP39542 | |
| Descripción | Advanced Lighting Management Unit | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de LP39542 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
|
No Preview Available !
August 2007
www.DataSheet4U.com
LP39542
Advanced Lighting Management Unit
General Description
LP39542 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 stand-alone command based RGB con-
troller 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 I2C in-
terface allows easy control of LP39542. 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
■ Programmable ON/OFF blinking sequences for RGB LED
■ High current driver for flash LED with built-in timing and
safety feature.
■ 4+2 or 6 low voltage constant current white LED drivers
with programmable 8-bit adjustment (0...25 mA/LED)
■ High efficiency Boost DC-DC converter
■ I2C compatible interface
■ Possibility for external PWM dimming control
■ Possibility for clock synchronization for RGB timing
■ Ambient light and temperature sensing possibility
■ Small package – microSMD-36, 3.0 x 3.0 x 0.6 mm
Applications
■ Cellular Phones
■ PDAs, MP3 players
Typical Applications
© 2007 National Semiconductor Corporation 300085
30008560
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 LP39542 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, RFLASH = 910Ω, RRGB = 5.6 kΩ and RRT
= 82 kΩ (Note 12).
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
IVDDIO
RGB drivers
(VDD1 + VDD2)
WLED drivers
(VDD1 + VDD2)
Audio synchronization
(VDD1 + VDD2)
Flash
(VDD1 + VDD2)
VDDIO Standby Supply
current
CC mode at R1, G1, B1 and R2, G2, B2 set to 15 mA
SW mode
4+2 banks IOUT = 25.5 mA per LED
Audio sync ON
VDD1,2 = 2.8V
VDD1,2 = 3.6V
I(RFLASH) = 1 mA
Peak current during flash
NSTBY (bit)=L
SCL = H, SDA = H
150 μA
150
500 μA
390 μA
700
2 mA
1 μA
IEXT_LDO
VDDA
External LDO output 7V tolerant application only
current
(VDD1, VDD2, VDDA)
IBOOST = 300 mA
Output voltage of internal (Note 13)
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 LP39542 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 is limited to 300 mA (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 Lever Chip Scale Package
Note 8: The Human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin.
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
30008516
Output Voltage vs Load Current
30008517
Efficiency at Low Load vs Autoload
30008561
30008562
11 www.national.com
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LP39542.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LP3954 | LP3954 Advanced Lighting Management Unit (Rev. D) |  Texas Instruments |
| LP3954 | Advanced Lighting Management Unit | National Semiconductor |
| LP39542 | Advanced Lighting Management Unit | National Semiconductor |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |