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参数资料
| 型号： | MAX8879ETG+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 7/16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 |
Charge Pump for Backlight/Flash/RGB LEDs
with Safety Timer
Pin Description
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
—
NAME
PIN
IN
GND
V DD
M4
M3
M2
M1
F4
F3
F2
F1
S3
S2
S1
FSH
SCK
SDA
C1N
C1P
PGND
OUT
C2P
C2N
EP
FUNCTION
Power-Supply Voltage Input. Connect PIN to IN. Connect a 4.7μF ceramic capacitor from PIN to
PGND. The input voltage range is 2.7V to 5.5V. PIN is high impedance during shutdown.
Analog Supply Voltage Input. Connect IN to PIN. The input voltage range is 2.7V to 5.5V. IN is high
impedance during shutdown.
Ground. Connect GND to system ground and the ground side of the input bypass capacitor as close
to the IC as possible.
Logic-Input Supply Voltage. Connect V DD to the logic supply driving SDA and SCK. Connect a 0.1μF
ceramic capacitor from V DD to GND.
LED Cathode Connections. Current flowing into these pins is based on the internal I 2 C dimming
registers. The charge pump regulates the lowest LED cathode voltage to 0.15V. Grounding any of
these pins forces output overvoltage protection mode causing OUT to pulse on and off at
approximately 5V. To avoid constantly operating in overvoltage protection mode, any unused LED
cathode connection (M_, S_, or F_) must be connected to OUT. This disables the corresponding
current regulator. These pins are high impedance in shutdown.
M1 through M4 are for main display backlights.
S1 through S3 are for subdisplay backlights or one RGB LED indicator.
F1 through F4 are for LED flash.
Any combination of M_, S_, and F_ can be connected together to drive higher current LEDs.
Flash Logic Input. Drive FSH low to turn on the flash LEDs (F1–F4) at the current specified in the
internal flash register. The built-in flash timer is activated by synchronizing with the active-low falling
edge on the pin. Drive FSH high to turn off the flash LEDs. This logic-high/low signal is only dedicated
for enabling or deactivating flash LEDs. If the embedded flash timer expires in a certain time, it is not
reactivated unless a falling edge is monitored again.
I 2 C Clock Input. Data is read on the rising edge of SCK.
I 2 C Data Input. Data is read on the rising edge of SCK.
Transfer Capacitor 1 Negative Connection. Connect a 1μF ceramic capacitor from C1N to C1P. C1N
is shorted to IN during shutdown.
Transfer Capacitor 1 Positive Connection. Connect a 1μF ceramic capacitor from C1N to C1P. During
shutdown, if V OUT > V IN , C1P is shorted to OUT. If V OUT < V IN , C1P is shorted to IN.
Power Ground. Charge-pump switching ground. Connect to GND and EP as close to the IC as
possible.
Output. Connect a 10μF ceramic capacitor from OUT to PGND. The anodes of all the LEDs connect
to OUT. OUT is pulled to ground through an internal 5k Ω resistor in shutdown.
Transfer Capacitor 2 Positive Connection. Connect a 1μF ceramic capacitor from C2N to C2P. During
shutdown, if V OUT > V IN , C2P is shorted to OUT. If V OUT < V IN , C2P is shorted to IN.
Transfer Capacitor 2 Negative Connection. Connect a 1μF ceramic capacitor from C2N to C2P. C2N
is shorted to IN during shutdown.
Exposed Paddle. Connect to GND and PGND directly under the IC.
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