The MIC2871 is a high-current, high-efficiency flash LED
driver. The LED driver current is generated by an inte-
grated inductive boost converter with a 2 MHz switching
frequency, which allows the use of a very small inductor
and output capacitor. These features make the MIC2871
an ideal solution for high-resolution camera phone LED
flashlight driver applications.
The MIC2871 operates in either Flash or Torch modes
that can be controlled through the single-wire serial inter-
face and/or external control pins. Default flash and torch
brightness can be adjusted via an external resistor. A
robust single-wire serial interface allows simple control
by the host processor to support typical camera
functions. such as auto-focus, white balance, and image
capture (Flash mode).
The MIC2871 is available in a 14-pin 3 mm x 2 mm LDFN
package with a junction temperature range of –40°C to
+125°C.
Applications
• Camera Phones/Mobile Handsets
• Cell Phones/Smartphones
• LED Light for Image Capture/Auto-Focus/
White Balance
• Handset Video Light (Torch Light)
• Digital Cameras
• Portable Applications
2018 Microchip Technology Inc.
DS20006079A-page 1
MIC2871
Package Type
MIC2871
14-Pin 3 mm x 2 mm LDFN (MK)
(Top View)
AGND1
DC
LED
FEN1
AGND2
V
IN
PGND1
1
2
3
4
5
6
7
14
13
12
11
10
FRSET
PGND2
NC
FEN2
SW
NC
OUT
ePAD
(EP)
9
8
Typical Application Schematic
L1 1 μH
V
BAT
V
IN
SW
OUT
LED1
FLASH
WHITE
LED
C4
4.7 μF
C1
2.2 μF/10V
GND
SINGLE-WIRE SERIAL I/F
FLASH ENABLE #1
FLASH ENABLE #2
AGND2
EPAD
AGND1
DC
FEN1
FEN2
LED
PGND1
PGND2
FRSET
R4
20.5 k
AGND2
U1
MIC2871YMK
DS20006079A-page 2
2018 Microchip Technology Inc.
MIC2871
Functional Block Diagram
SW
DIE TEMP
155°C/
140°C
OTP
SAFETY
TIMER V
IN
BODY
SWITCH
LBVD
OUT
SYSTEM
CONTROL
LOGIC +
ANTI-CROSS
CONDUCTION
PGND
V
IN
2.75V/
2.30V
UVLO
FEN1
FEN2
DC
LED 1.7V
OUT
SINGLE-
WIRE
SERIAL
INTERFACE
LED SCP
PGND1
PGND2
2MHz
OSCILLATOR
AGND
Z
Z
OUT
5.37V/5.31V
OVP
V/I
LED
SAFETY TIMER
SAFETY
TIMER
AGND2
FRSET
AGND1
2018 Microchip Technology Inc.
DS20006079A-page 3
MIC2871
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings†
Input Voltage (V
IN
)...................................................................................................................................... -0.3V to +6.0V
General I/O Voltage (V
FEN1
, V
FEN2
)............................................................................................................... -0.3V to V
IN
V
OUT
and V
LED
Voltage.............................................................................................................................. -0.3V to +6.0V
Single-Wire I/O Voltage (V
DC
) ........................................................................................................................ -0.3V to V
IN
V
FRSET
Voltage .............................................................................................................................................. -0.3V to V
IN
V
SW
Voltage ............................................................................................................................................... -0.3V to +6.0V
ESD Rating
(1)
........................................................................................................................... 2 kV, HBM and 200V, MM
†
Notice:
Stresses above those listed under “Maximum Ratings” may cause permanent damage to the device. This
is a stress rating only and functional operation of the device at those or any other conditions above those indi-
cated in the operational sections of this specification is not intended. Exposure to maximum rating conditions for
extended periods may affect device reliability.
Devices are ESD-sensitive. Handling precautions are recommended. Human body model, 1.5 k in series
with 100 pF.
Note 1:
Operating Ratings
(1)
Input Voltage (V
IN
)..................................................................................................................................... +2.7V to +5.5V
Enable Input Voltage (V
FEN1
, V
FEN2
) ................................................................................................................. 0V to V
IN
Single-Wire I/O Voltage (V
DC
) ............................................................................................................................ 0V to V
卡巴斯基的安全研究人员称其发现了如何攻击Intel微处理器的远程攻击代码，据传，这一代码可以通过TCP/IP包和JavaScript代码到达用户系统。 目前受影响的系统包括Windows XP，Vista，Windows Server 2003，Windows Server 2008，Linux甚至是BSD和Mac。但所幸大多数错误可以由Intel和BIOS厂商联合进行修复。 卡...[详细]
微控制器 MCU
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
