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MAX1985ETP-T

更新时间： 2024-09-25 13:00:15
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美信 - MAXIM 驱动器
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17页 333K
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MAX1985ETP-T 数据手册

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19-2761; Rev 0; 1/03  
Ultra-High-Efficiency White  
LED Drivers  
General Description  
Features  
The MAX1984/MAX1985/MAX1986 are white light-emit-  
ting diode (LED) drivers that use individual regulators to  
control the current of up to eight LEDs. A high-efficiency  
step-up regulator generates just enough voltage to keep  
all the current regulators in regulation. A versatile dim-  
ming interface accommodates analog, digitally adjusted  
pulse-width modulation (DPWM), or parallel control.  
ꢀ Synchronous Step-Up Regulator  
Achieves >95% Efficiency  
Internal Switch and Synchronous Rectifier  
Eliminates External MOSFETs and Diodes  
1MHz Fixed Frequency Minimizes Component  
Sizes  
ꢀ Up to 90% Total LED Efficiency  
The individual current regulators allow good current  
matching between LEDs. Open or shorted LEDs cannot  
affect the performance of other LEDs.  
ꢀ Accurate LED Current Matching (8% max)  
ꢀ Adjustable Maximum LED Current  
ꢀ Multimode Dimming Control  
Digital Pulse-Width Modulation Control  
2-Bit Parallel Control  
The step-up regulator achieves high efficiency by using  
synchronous rectification. The internal N-channel switch  
and P-channel synchronous rectifier eliminate the need  
for external MOSFETs and diodes. The 1MHz switching  
frequency allows the use of low-profile inductors and  
ceramic capacitors.  
3-Bit Parallel Control  
Analog Control  
ꢀ Selectively Enable LEDs  
The brightness can be easily adjusted using a multi-  
mode dimming interface, which allows brightness control  
through a DPWM signal, a 2- or 3-bit parallel control  
interface, or an analog signal. The DPWM signal can be  
connected directly to the control pin without the need for  
an external RC filter if its frequency is 10kHz or above.  
ꢀ Open-LED Detection  
ꢀ Unique 0.5mA LED Test Mode  
ꢀ 2.7V to 5.5V Input Supply Range  
ꢀ Small 4mm x 4mm 20-Pin Thin QFN Package  
The MAX1984 drives up to eight LEDs, the MAX1985  
drives up to six LEDs, and the MAX1986 drives up to  
four LEDs. Each device has an LED select pin (SEL)  
that allows one subset, the other subset, or all LEDs to  
be illuminated. All three devices are available in a  
4mm ✕ 4mm thin QFN package.  
Ordering Information  
NO. OF  
LEDs  
PART  
TEMP RANGE PIN-PACKAGE  
MAX1984ETP  
MAX1985ETP  
MAX1986ETE  
-40°C to +85°C 20 Thin QFN  
-40°C to +85°C 20 Thin QFN  
-40°C to +85°C 16 Thin QFN  
8
6
4
Applications  
PDAs and Hand-Held PCs  
Cellular Phones  
Digital Cameras  
Pin Configurations  
TOP VIEW  
20  
19  
18  
17  
16  
20  
19  
18  
17  
16  
16  
15  
14  
13  
OUT  
LX  
1
2
3
4
5
15 BITB  
14 REF  
13 SETI  
12 LD8  
11 LD7  
OUT  
LX  
1
2
3
4
5
15 BITB  
14 REF  
13 SETI  
12 N.C.  
11 LD6  
OUT  
LX  
1
2
3
4
12 BITA  
11 BITB  
10 REF  
GND  
LD1  
LD2  
GND  
N.C.  
LD1  
MAX1984  
MAX1985  
MAX1986  
GND  
LD1  
9
SETI  
6
7
8
9
10  
6
7
8
9
10  
5
6
7
8
4mm x 4mm  
THIN QFN  
4mm x 4mm  
THIN QFN  
4mm x 4mm  
THIN QFN  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at  
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.  
1234567...17

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