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| 型号： | MAX8645XETI+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 1/14页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT 28-TQFN |
| 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： | 线性（LDO），切换式电容器（充电泵） |
| 输出数： | 8 |
| 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： | 2.7 V ~ 5.5 V |
| 输出电压： | 5.5V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（4x4） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
ATION
EVALU
AVAILA
19-3978; Rev 4; 6/08
KIT
B LE
1x/1.5x/2x White LED Charge Pumps with
Two LDOs in 4mm x 4mm TQFN
General Description
The MAX8645X/MAX8645Y charge pumps drive up to
eight white LEDs with regulated constant current for uni-
form intensity. The main group of LEDs (M1–M6) can be
driven up to 30mA per LED for backlighting. The flash
group of LEDs (F1 and F2) is independently controlled
and can be driven up to 200mA per LED (or 400mA total).
Two 200mA LDOs are on-board to provide power for
camera functions. The LDOs’ output voltages are pin pro-
grammable to meet different camera-module require-
ments. The MAX8645X and MAX8645Y differ only in LDO
output voltages. By utilizing adaptive 1x/1.5x/2x charge-
pump modes and very-low-dropout current regulators,
the MAX8645X/MAX8645Y achieve high efficiency over
the full 1-cell lithium-battery voltage range. The 1MHz
fixed-frequency switching allows for tiny external compo-
nents, and the regulation scheme is optimized to ensure
low EMI and low input ripple.
The MAX8645X/MAX8645Y are available in a 28-pin TQFN,
4mm x 4mm (0.8mm max height) lead-free package.
Applications
Camera Phones and Smartphones
Backlighting and Flash
PDAs, Digital Cameras, and Camcorders
Typical Operating Circuit
Features
? Power Up to Eight LEDs
Up to 30mA/LED Drive for Backlight
Up to 400mA Total Drive for Flash
? Two Internal Low-Noise 200mA LDOs
? 94% Max/85% Avg Efficiency (P LED /P BATT ) over Li+
Battery Discharge
? 0.2% Typical LED Current Matching
? Adaptive 1x/1.5x/2x Mode Switchover
? Single-Wire, Serial-Pulse Interface for Brightness
Control (32 Steps)
? Thermal T A Derating Function
? Low Input Ripple and EMI
? 2.7V to 5.5V Supply Voltage Range
? Soft-Start, Overvoltage, and Thermal-Shutdown
Protection
? 28-Pin TQFN, 4mm x 4mm Package
Ordering Information
1 μ F
1 μ F
PART
TEMP RANGE
PIN-PACKAGE
INPUT
2.7V TO 5.5V
C1P
PIN
C1N
C2P
C2N
OUT
OUTPUT
UP TO 580mA
MAX8645X ETI+
-40°C to +85°C
28 TQFN-EP
4mm x 4mm
10 μ F
IN
GND
PGND
MAX8645X
MAX8645Y
M1
M2
10 μ F
MAIN
FLASH
MAX8645Y ETI+
EP = Exposed pad.
-40°C to +85°C
28 TQFN-EP
4mm x 4mm
M3
+Denotes a lead-free package.
MAIN ON/OFF
AND DIMMING
FLASH ON/OFF
ENM1
ENM2
ENF
M4
M5
M6
F1
F2
DUAL-LDO ON/OFF
ENLDO
LDO1
CAMERA
DUAL-LDO
VOLTAGE
P1
LDO2
1 μ F
1 μ F
MODULE
SELECTION
P2
SETM
SETF
REF
Pin Configuration appears at end of data sheet.
0.01 μ F
________________________________________________________________ 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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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8645YETI+ | 功能描述:LED照明驱动器 1x/1.5x/2x White LED Charge Pump RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX8645YETI+T | 功能描述:LED照明驱动器 1x/1.5x/2x White LED Charge Pump RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX8645YEVKIT | 制造商:Maxim Integrated Products 功能描述:1X/1.5X/2X CHARGE PUMP WITH 6 LEDS - Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
| MAX8646ETG+ | 功能描述:直流/直流开关调节器 6A 2MHz Step-Down Regulator w/Switch 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 |
| MAX8646ETG+T | 功能描述:直流/直流开关调节器 6A 2MHz Step-Down Regulator w/Switch 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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