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参数资料
| 型号： | MAX8830EWE+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT 16-UCSP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 拓扑： | 线性（LDO），PWM，升压（升压） |
| 输出数： | 5 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光，闪灯/白光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 750kHz ~ 1.25MHz |
| 电源电压： | 2.7 V ~ 5.5 V |
| 输出电压： | 3.8 V ~ 5.2 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WLP |
| 供应商设备封装： | 16-WLP（2x2） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
LED Light Management IC in
2.5mm x 2.5mm UCSP
Flash Current-Sink Regulator
(FLED, MVON, FLEN)
A low-dropout linear current regulator from FLED to
PGND sinks current from an external flash LED cathode
terminal. The FLED current is regulated to I 2 C-program-
mable levels for movie mode (up to 160mA) and flash
mode (up to 320mA). The movie mode provides contin-
uous lighting when enabled through I 2 C (see Table 1).
The flash mode is enabled only when FLEN goes high.
A flash maximum timer, programmable from 0.5s to
2.0s through I 2 C, limits the duration of the flash mode in
case FLEN remains high. The flash mode has priority
over the movie mode.
Current-Sink Regulators (LED1–LED4)
Four low-dropout linear current regulators from LED_ to
GND sink current from external LED cathode terminals.
The LED_ currents are individually regulated to an I 2 C-
programmable level from off to 10mA in 32 steps, inde-
pendently set for each LED_.
Undervoltage Lockout
The IC contains undervoltage lockout (UVLO) circuitry
that disables the device until V IN is greater than 2.45V
(typ). Once V IN rises above 2.45V (typ), the UVLO cir-
cuitry does not disable the IC until V IN falls below the
UVLO threshold hysteresis.
Soft-Start
The MAX8830 soft-starts by charging C COMP with a
100μA current source. During this time, the internal
MOSFET is switching at the minimum duty cycle. Once
V COMP rises above 1V, the duty cycle increases until the
output voltage reaches the desired regulation level.
COMP is pulled to GND with a 80 Ω internal resistor dur-
ing UVLO or shutdown. See the Typical Operating
Characteristics for an example of soft-start operation.
Shutdown and Standby
The MAX8830 is in shutdown when V DD = 0. In shut-
down, supply current is reduced to 0.1μA (typ). The
MAX8830 is in standby when the step-up converter and
all LED outputs are turned off through I 2 C (and by
keeping MVON and FLEN at logic 0). During this time,
the I 2 C port remains in standby (ready) state as long as
logic-high voltage is supplied to V DD .
C COMP is discharged whenever the step-up converter is
turned off, allowing the device to reinitiate soft-start when
it is enabled. The internal MOSFET and synchronous rec-
tifier are also high impedance when the step-up converter
is off; however, OUT is one diode drop below the input.
FLED and LED_ are high impedance in shutdown, so the
external LEDs are all off, but any external circuitry on OUT
(such as an audio amplifier) is not disconnected, and
therefore, should include its own shutdown capability.
Parallel Connection of
Current-Sink Regulators
The LED current-sink regulators (FLED and LED_) can
be connected in parallel in any combination to allow the
use of higher current LEDs or any other desired effects.
Unused current regulators may be left unconnected or
shorted to ground. The LED regulators must be dis-
abled through I 2 C to avoid a fault detection from an
open or short.
Open/Short LED Detection
The MAX8830 includes 10 comparators to detect open
or shorted LEDs on the FLED and LED1–LED4 pins.
One comparator on each pin detects when the voltage
falls below 100mV, indicating an open LED fault.
Another comparator on each pin detects when the volt-
age rises above V OUT - 1V, indicating a shorted LED
fault. The fault-detection comparators are enabled only
when the corresponding current sink is enabled (and
not set to zero current). Once a fault is detected the two
comparators provide a single bit output (1 = fault, 0 =
no fault) corresponding to the appropriate pin. When a
read command (address 0x95) is issued to the
MAX8830, the status of each pin is latched into the sta-
tus register (see Table 6) and subsequently written to
the I 2 C bus by the MAX8830.
Thermal Shutdown
Thermal shutdown limits total power dissipation in the
MAX8830. When the junction temperature exceeds
+160°C, the device turns off, allowing the IC to cool.
The IC turns on and begins soft-start after the junction
temperature cools by 20°C. This results in a pulsed out-
put during continuous thermal-overload conditions.
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| MAX8833ETJ+T | 功能描述:直流/直流开关调节器 Dual 3A 2MHz Step-Down Regulator RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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