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| 型号： | MAX8596ZETA+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 6/10页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR WHITE BCKLGT 8-TDFN |
| 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： | PWM，升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 1MHz |
| 电源电压： | 2.6 V ~ 6 V |
| 输出电压： | 36V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WDFN 裸露焊盘 |
| 供应商设备封装： | 8-TDFN-EP（3x3） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
High-Efficiency, 36V Step-Up Converters
with T A Derating Option for 2 to 9 White LEDs
Detailed Description
The high efficiency and small size of the MAX8595X/
MAX8596X make them ideally suited to drive up to nine
series-connected LEDs. These devices operate as a
2.6V TO 6.0V
2.2 μ F
22 μ H
boost DC-DC converter that regulates output current
rather than voltage. The MAX8595X/MAX8596X provide
IN
LX
even illumination by sourcing the same output current
through each LED, eliminating the need for expensive
factory calibration. The fast 1MHz internal oscillator
PWM
CONTROL
PGND
allows for a small inductor and small input and output
capacitors while minimizing input and output ripple.
The single analog control input (CTRL) allows easy
adjustment of LED brightness and on/off control. This
f OSC
1MHz
OVER-
VOLTAGE
PROTECT
OUT
0.1 μ F
allows simple logic-level on/off control, analog voltage
control, or PWM duty-cycle control of both brightness
and shutdown. In shutdown, supply current is reduced
0.1 μ F
COMP
to a low 0.3μA (typ). A soft-start gradually illuminates
the LEDs, eliminating the inrush current during startup.
CTRL
1.25V CLAMP OR
TEMP DERATE CLAMP
g m
The MAX8596X has the additional feature of derating
LED current as ambient temperature rises. Above
+42 ° C, the CS regulation voltage is reduced at a rate of
5.5mV/ ° C, thus reducing the LED current.
ANALOG
OR DIRECT
PWM
DIMMING
121k ?
279k ?
100k ?
CS
R SENSE
13 ?
Soft-Start
170mV
8.2ms
SHUTDOWN
The MAX8595X/MAX8596X attain soft-start by charging
C COMP gradually with a current source. When V COMP
rises above 1.25V, the internal MOSFET begins switch-
ing at a reduced duty cycle. When V COMP rises above
2.25V, the duty cycle is at its maximum. See the
Typical Operating Characteristics for an example of
soft-start operation.
Shutdown
The MAX8595X/MAX8596X enter shutdown when V CTRL
is less than 100mV for more than 8.2ms. In shutdown,
supply current is reduced to 0.3μA (typ) by powering
down the entire IC except for the CTRL voltage-detec-
tion circuitry. C COMP is discharged during shutdown,
allowing the device to reinitiate soft-start when it is
enabled. Although the internal n-channel MOSFET does
not switch in shutdown, there is still a DC current path
between the input and the LEDs through the inductor
and Schottky diode. The minimum forward voltage of the
LED array must exceed the maximum input voltage to
ensure that the LEDs remain off in shutdown. However,
with two or more LEDs, the forward voltage is large
enough to keep leakage current low, less than 1μA
(typ). Typical shutdown timing characteristics are shown
in the Typical Operating Characteristi cs.
Overvoltage Protection
Overvoltage lockout (OVLO) occurs when V OUT is
above 38V (typ). The protection circuitry stops the inter-
GND
Figure 1. Functional Diagram and Typical Application Circuit
nal MOSFET from switching and causes V COMP to
decay towards 0V. The device comes out of OVLO and
into soft-start when V OUT falls below 36V (typ).
Ambient Temperature Derating Function
(MAX8596X)
The MAX8596X limits the maximum LED current
depending on the die temperature. V CS is limited to
343mV up to +42 ° C. Once the temperature reaches
+42 ° C, the maximum V CS declines by 5.5mV/ ° C until
the minimum 106.5mV threshold is reached at +85 ° C.
Due to the package’s exposed paddle, the die temper-
ature is always very close to the PC board temperature.
The temperature derating function allows the LED cur-
rent to be safely set higher at normal operating temper-
atures, thereby allowing either a brighter display or
fewer LEDs to be used for normal display brightness.
See the Typical Operating Characteristics for LED
Current vs. Ambient Temperature.
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8596ZEVKIT | 功能描述:LED 照明开发工具 Evaluation Kit for the MAX8595X MAX8595Z MAX8596X MAX8596Z RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
| MAX8597ETP+ | 功能描述:DC/DC 开关控制器 Step-Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX8597ETP+T | 功能描述:DC/DC 开关控制器 Step-Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX8597EVKIT | 制造商:Maxim Integrated Products 功能描述:LOW-DROPOUT WIDE-INPUT-VOLTAGE ST - Rail/Tube |
| MAX8598ETE | 制造商:Maxim Integrated Products 功能描述: |
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