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參數(shù)資料
| 型號(hào)： | MAX8901BETA |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Highest Efficiency Supply for 2 to 6 Series WLEDs in a 2mm x 2mm TDFN Package |
| 中文描述： | 最高效率的供應(yīng)2至6個(gè)WLED系列中采用2mm x 2mm TDFN封裝 |
| 文件頁數(shù)： | 1/15頁 |
| 文件大小： | 310K |
| 代理商： | MAX8901BETA |
General Description
The MAX8901A/MAX8901B step-up converters drive from
two to six series-connected white LEDs (WLEDs) with
constant current to provide uniform WLED intensity for
LCD backlighting in cell phones, PDAs, and other hand-
held devices. The MAX8901_ operate at a fixed 750kHz
(typ) switching frequency, allowing for tiny external com-
ponents, and are optimized for the highest possible effi-
ciency over the full 1-cell Li+/Li-Poly battery range.
These converters use a single input (ON) to enable the
IC and to control WLED intensity. The MAX8901A
requires a direct PWM input to regulate WLED intensity
with the WLED current proportional to the PWM duty
cycle. The MAX8901B uses single-wire, serial-pulse
dimming that reduces the WLED intensity in 32 linear
steps. Full-scale WLED current for serial-pulse
dimming is 24.75mA (MAX8901B, 0.75mA/step).
The MAX8901_ features an internal soft-start to eliminate
inrush currents during startup, input overvoltage
protection, WLED overvoltage protection, and a shut-
down mode with 0.01μA (typ) shutdown current. No
WLED current is present in shutdown provided the
WLED forward voltage is greater than the input supply
voltage. Additional features include undervoltage lock-
out (UVLO) and thermal shutdown.
The MAX8901_ are available in tiny 8-pin, 2mm x 2mm
TDFN-EP packages (0.8mm max height).
Applications
Display Backlight (from 2 to 6 WLEDs)
Cellular Phones
PDAs and Smartphones
MP3 and Portable Media Players
Portable Navigation Devices
Digital Cameras
Features
High Efficiency, Up to 91%
2.6V to 5.5V Input Voltage Range
Fixed-Frequency Operation
Supplies from 2 to 6 WLEDs with 1% LED Current
Accuracy
Flexible Dimming Control
Direct PWM Dimming (MAX8901A)
32-Step, 1-Wire Serial Dimming
(MAX8901B)
Input Undervoltage Lockout
Input Overvoltage Lockout
WLED Overvoltage Protection (25V typ)
0.01μA (typ) Shutdown Current
No WLED Current in Shutdown
Internal Soft-Start and Thermal Shutdown
Ordering Information
M
Highest Efficiency Supply for 2 to 6
Series WLEDs in a 2mm x 2mm TDFN Package
________________________________________________________________ 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
MAX8901A
IN
COMP
GND
ON
LX
OVP
PGND
CS
OUTPUT
UP TO 25V
4
1
5
8
2
EP
3
7
6
INPUT
2.6V TO 5.5V
PWM DIMMING
CONTROL
Typical Operating Circuits
19-0865; Rev 0; 8/07
Note:
All devices are specified over the -40°C to +85°C operating
temperature range.
+
Denotes a lead-free package.
*
EP = Exposed paddle.
T = Tape and reel.
EVALUATION KIT
AVAILABLE
PART
PIN-PACKAGE
PKG
CODE
TOP
MARK
MAX8901A
ETA+T
8 TDFN-EP*
2mm x 2mm
T822-1
+ABA
MAX8901B
ETA+T
8 TDFN-EP*
2mm x 2mm
T822-1
+ABB
MAX8901B
IN
COMP
GND
ON
LX
OVP
PGND
CS
OUTPUT
UP TO 25V
4
1
5
8
2
EP
3
7
6
INPUT
2.6V TO 5.5V
SERIAL-PULSE
DIMMING
CONTROL
Pin Configuration appears at end of data sheet.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX8901BETA+ | 制造商:Maxim Integrated Products 功能描述:HIGHEST EFFICIENCY SUPPLY FOR 2 TO 6 SERIES WLEDS IN A - Rail/Tube |
| MAX8901BETA+CAR | 功能描述:LED照明驅(qū)動(dòng)器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| MAX8901BETA+T | 功能描述:LED照明驅(qū)動(dòng)器 Supply for 2 to 6 Series WLEDs RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| MAX8901BETA+TCAR | 功能描述:LED照明驅(qū)動(dòng)器 Highest Efficiency Supply for 2 to 6 Series WLEDs in a 2mm x 2mm TDFN Package RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| MAX8901BETA+TCH8 | 功能描述:LED照明驅(qū)動(dòng)器 Supply for 2 to 6 Series WLEDs RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
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