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PDF MIC2870 Data sheet ( Hoja de datos )
| Número de pieza | MIC2870 | |
| Descripción | 1.5A Synchronous Boost Flash LED Driver | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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MIC2870
1.5A Synchronous Boost Flash LED Driver
with I2C Interface
General Description
The MIC2870 is a high-current, high-efficiency flash LED
driver for one or two high-brightness camera flash LEDs.
The LED driver current is generated by an integrated
inductive boost converter with 2MHz switching frequency
which allows the use of a very-small inductor and output
capacitor. These features make the MIC2870 an ideal
solution for high-resolution camera phone LED flashlight
driver applications.
MIC2870 supports two 750mA white-LEDs (WLEDs) or a
single 1.5A WLED configuration. When two WLEDs are
connected, their currents are matched automatically.
MIC2870 operates in either flash or torch modes that can
be controlled through either an I2C interface or external
pins. The brightness in the flash and torch mode can be
adjusted via two external resistors individually. High-speed
mode I2C interface provides a simple control at a clock
speed up to 3.4MHz to support most camera functions
such as auto-focus, white balance, and image capture
(flash mode).
The MIC2870 is available in 16-pin, 2mm × 2mm TQFN
package with a junction temperature range of −40°C to
+125°C.
Datasheets and support documentation are available on
Micrel’s web site at: www.micrel.com.
Features
• Up to 1.5A flash LED driving current
− 2.7V to 5.0V input voltage range
• High-efficiency 2MHz VF adaptive boost driver
• Configurable 1 or 2 channel(s) WLED driver
• LED driving current soft-start
• Control through I2C interface or external pins
• Flash inhibit function for GSM pulse synchronization
• True load disconnect
• Flash time-out protection
• 1µA shutdown current
• Available in 16-pin 2mm × 2mm TQFN package
Applications
• Camera phones/mobile handsets
• Cellular phones/smart phones
• LED light for image capture/auto focus/white balance
• Handset video light (torch light)
• Digital cameras
• Portable applications
Typical Application
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
September 5, 2013
Revision 1.0
1 page  
Micrel, Inc.
MIC2870
Electrical Characteristics(7) (Continued)
VIN = 3.6V; L = 1μH, COUT = 2.2μF, RFRSET = 10kΩ, RTRSET = 10kΩ, ILED = 100mA; TA = 25°C, bold values indicate −40°C ≤ TJ ≤ 125°C,
unless otherwise noted.
Symbol
Parameter
Condition
Min. Typ. Max. Units
FSW
RON(N)
RON(P)
ILK(N)
ILK(P)
Oscillator Frequency
Switch On-Resistance
NMOS Switch Leakage
Current
PMOS Switch Leakage
Current
VVIN = 2.7 V, ISW = 750 mA
VSW = 2.7 V, IOUT = 750 mA
VEN = 0 V, VIN = Vsw = VOUT = 5 V
VEN = 0 V, VIN = VOUT = 5 V, Vsw = 0 V
1.8 2.0 2.2 MHz
80
mΩ
80
1 5 µA
1 5 µA
RDCHG
Auto-Discharge NMOS
Resistance
VEN = 0 V, IOUT = −1 mA
160 Ω
TSD
Overtemperature Shutdown
Threshold
160 °C
TSD_HYST
Overtemperature Shutdown
Hysteresis
25 °C
TFLASH_TIMEOUT
Flash Safety Timeout
Shutdown
Current Sink Channels
Maximum timeout setting
1.25 s
AccuLED_Ch
MatchLED_Ch
VDROPOUT
ILK_LED1
ILK_LED2
VFRSET
IFRSET
VTRSET
ITRSET
Channel Current Accuracy
Channel Current Matching
Current Sink Dropout
LED1 Leakage Current
LED2 Leakage Current
FRSET Pin Voltage
FRSET Current Sourcing
TRSET Pin Voltage
TRSET Current Sourcing
VLED1 = VLED2 = 890mV,
ILED1 = ILED2 = 750mA
VLED1 = VLED2 = 890mV,
ILED1 = ILED2 = 750mA
Boost is in regulation
VIN = 3.6 V, VEN = 0 V, VLED1 = 3.6 V
VIN = 3.6 V, VEN = 0 V, VLED2 = 3.6 V
RFRSET = 10kΩ, flash mode
FRSET pin is shorted to ground,
flash mode
RTRSET = 10kΩ, torch mode
TRSET pin is shorted to ground, torch
mode
−10 10
−5 5
100
0.05
0.05
0.970 1.00 1.030
90 100 110
0.970 1.00 1.030
90 100 110
%
%
mV
µA
µA
V
µA
V
µA
September 5, 2013
5
Revision 1.0
5 Page 
Micrel, Inc.
Functional Characteristics (Continued)
MIC2870
September 5, 2013
11
Revision 1.0
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet MIC2870.PDF ] | |
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