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MAX8901A PDF预览

MAX8901A

更新时间: 2024-11-05 03:14:59
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美信 - MAXIM /
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15页 299K
描述
Highest Efficiency Supply for 2 to 6 Series WLEDs in a 2mm x 2mm TDFN Package

MAX8901A 数据手册

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19-0865; Rev 0; 8/07  
Highest Efficiency Supply for 2 to 6  
Series WLEDs in a 2mm x 2mm TDFN Package  
/MAX8901B  
General Description  
Features  
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.  
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)  
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).  
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  
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.  
Ordering Information  
PKG  
CODE  
TOP  
MARK  
PART  
PIN-PACKAGE  
8 TDFN-EP*  
2mm x 2mm  
The MAX8901_ are available in tiny 8-pin, 2mm x 2mm  
TDFN-EP packages (0.8mm max height).  
MAX8901AETA+T  
MAX8901BETA+T  
T822-1  
T822-1  
+ABA  
+ABB  
Applications  
8 TDFN-EP*  
2mm x 2mm  
Display Backlight (from 2 to 6 WLEDs)  
Note: All devices are specified over the -40°C to +85°C operating  
temperature range.  
Cellular Phones  
PDAs and Smartphones  
MP3 and Portable Media Players  
Portable Navigation Devices  
Digital Cameras  
+Denotes a lead-free package.  
*EP = Exposed paddle.  
T = Tape and reel.  
Pin Configuration appears at end of data sheet.  
Typical Operating Circuits  
INPUT  
2.6V TO 5.5V  
INPUT  
2.6V TO 5.5V  
OUTPUT  
UP TO 25V  
OUTPUT  
UP TO 25V  
3
7
4
1
5
LX  
IN  
3
4
1
5
LX  
IN  
MAX8901A  
MAX8901B  
COMP  
GND  
OVP  
7
6
OVP  
COMP  
GND  
6
2
PGND  
PWM DIMMING  
CONTROL  
SERIAL-PULSE  
DIMMING  
CONTROL  
PGND  
CS  
8
ON  
CS  
2
EP  
8
ON  
EP  
________________________________________________________________ Maxim Integrated Products  
1
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.  

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