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| 型号： | MAX8879ETG+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 1/16页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WT/RGB BCKLGT 24TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 恒定电流： | 是 |
| 拓扑： | 切换式电容器（充电泵） |
| 输出数： | 11 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | RGB，白色 LED |
| 频率： | 1MHz |
| 电源电压： | 2.7 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 供应商设备封装： | 24-TQFN-EP（4x4） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
EVALUATION KI
19-4266; Rev 0; 9/08
AVAILABLE
T
Charge Pump for Backlight/Flash/RGB LEDs
with Safety Timer
General Description
The MAX8879 provides complete light management for
main display backlight, subdisplay backlight (or RGB
indicator), and white LED camera flash with regulated
constant current up to 610mA total. By utilizing adap-
tive 1x/1.5x/2x charge-pump modes and very-low-
dropout current regulators, it achieves high efficiency
over the full 1-cell Li+ battery input voltage range. The
1MHz fixed-frequency switching allows for tiny external
components while the regulation scheme is optimized
to ensure low EMI and low input ripple. An integrated
derating function protects the LEDs from overheating
during high ambient temperatures.
The MAX8879 features an internally trimmed reference
to set the maximum LED current. An I 2 C serial port is
used for on/off control and setting the LED currents in
32 linear steps for main, sub/RGB, and movie. When
using the RGB indicator, the I 2 C port provides 32k col-
ors and programmable ramp-up/down rates. The cam-
era flash for flash-mode operation is enabled by an
active-low signal on the FSH pin. A safety timer is acti-
vated on the falling edge of FSH , which has an I 2 C-
adjustable (programmable) period of no timer, 0.5s,
1.0s, or 2.0s (default). If the safety timer period expires,
Features
? Guaranteed 610mA Continuous Drive Capability
4 LEDs at 30mA Each for Main Display
3 LEDs at 30mA Each for Sub or RGB
400mA Total for Flash
? 2-Wire I 2 C Serial Port
5-Bit (32-Step) Linear Dimming
32k Colors
Ramp-Up/Down Rates
? 92% Peak/83% Avg Efficiency (P LED /P BATT )
? Adaptive 1x/1.5x/2x Mode Switchover
? 0.3% (typ) LED Current Accuracy and Matching
? Low Input Ripple and EMI
? Low 0.1 μ A Shutdown Current
? Output Overvoltage Protection
? I 2 C Programmable Flash Safety Timer
? Thermal Derating Function Protects LEDs
? 24-Pin, 4mm x 4mm Thin QFN Package
Ordering Information
both flash and movie modes are disabled.
Applications
Cell Phones and Smartphones
PART
MAX8879ETG+
TEMP RANGE
-40°C to +85°C
PIN-
PACKAGE
24 Thin QFN
4mm x 4mm
PDAs, Digital Cameras, Camcorders
Displays with Up to 11 LEDs
1 μ F
1 μ F
Pin Configuration appears at end of data sheet.
+Denotes a lead-free/RoHS-compliant package.
Typical Operating Circuit
INPUT
2.7V TO 5.5V
4.7 μ F
C1P
IN
PIN
C1N
C2P
C2N
OUT
OUTPUT
UP TO 610mA
10 μ F
MAIN
SUB OR RGB
FLASH
GND
MAX8879
M1
M2
V LOGIC
0.1 μ F
V DD
M3
M4
S1
S2
I 2 C PORT
ON/OFF AND
BRIGHTNESS
FLASH
ON/OFF
SCK
SDA
FSH
PGND
S3
F1
F2
F3
F4
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1
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| MAX887HESA+ | 功能描述:直流/直流开关转换器 100% Duty Step-Down DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX887HESA+T | 功能描述:直流/直流开关转换器 100% Duty Step-Down DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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