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PDF MAX1553ETA Data sheet ( Hoja de datos )
| Número de pieza | MAX1553ETA | |
| Descripción | 40V Step-Up Converters | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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MAX1553/MAX1554
EVALUATION KIT AVAILABLE
High-Efficiency, 40V Step-Up
Converters for 2 to 10 White LEDs
General Description
The MAX1553/MAX1554 drive white LEDs in series with
a constant current to provide efficient display backlight-
ing in cellular phones, PDAs, and other hand-held
devices. The step-up converter includes an internal
40V, low RDSON, N-channel MOSFET switch for high
efficiency and maximum battery life. The MAX1553 has
a current limit of 480mA for driving two to six white
LEDs, while the MAX1554 has a current limit of 970mA
for driving up to 10 white LEDs.
A single analog/PWM Dual Mode™ input provides two
simple means of brightness adjustment. A separate
enable input provides on/off control. Soft-start mini-
mizes inrush current during startup.
The MAX1553/MAX1554 are available in space-saving
8-pin TDFN 3mm x 3mm packages.
Applications
Cellular Phones
PDA, Palmtop, and Wireless Handhelds
Color Display Backlight
Dual Mode is a trademark of Maxim Integrated Products, Inc.
Benefits and Features
• Highly Integrated and Flexible Solution for Wide
Range of Backlighting Applications
• Constant-Current Regulation for Even LED
Illumination
• Internal 40V MOSFET Switch Capable of Driving
10 LEDs
• 2.7V to 5.5V Input Voltage Range
• Analog or PWM Control of LED Intensity
• Optimized for Low Input Ripple
• Soft-Start Minimizes Inrush Current
• High Efficiency Improves Battery Life
• Up to 88% Efficiency Driving 6 LEDs
• Up to 82% Efficiency Driving 9 LEDs (20mA,
VCC = 3.6V)
• Tiny 8-Pin, 3mm x 3mm TDFN Package Saves Space
• Small, Low-Profile External Components
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX1553ETA -40°C to +85°C 8 TDFN 3mm x 3mm
MAX1554ETA -40°C to +85°C 8 TDFN 3mm x 3mm
TOP
MARK
AGX
AGY
Typical Operating Circuit
2.7V TO 5.5V
INPUT
ON
OFF
PWM
OR
DC CONTROL
VCC LX
EN OV
MAX1553
MAX1554
BRT FB
SS GND
Pin Configuration
TOP VIEW
WHITE
LEDS
GND 1
VCC 2
EN 3
BRT 4
MAX1553
MAX1554
8 LX
7 0V
6 SS
5 FB
TDFN
3mm x 3mm
19-2875; Rev 2; 5/15
1 page  
MAX1553/MAX1554
High-Efficiency, 40V Step-Up
Converters for 2 to 10 White LEDs
Typical Operating Characteristics (continued)
(MAX1553 driving six white LEDs, VCC = VEN = 3.6V, Circuit of Figure 1, TA = +25°C, unless otherwise noted.)
SWITCHING WAVEFORMS
(CONTINUOUS OPERATION,
3.75V Li+ BATTERY, 18mA OUTPUT)
MAX1553/54 toc10
SWITCHING WAVEFORMS
(DISCONTINUOUS OPERATION,
3.75V Li+ BATTERY, 10mA OUTPUT)
MAX1553/54 toc11
VLX
10V/div
VLX
10V/div
VOUT 200mV/div
IL 200mA/div
2μs/div
L1 = 47μH, 4700pF CAPACITOR ACROSS LEDs
STARTUP/SHUTDOWN WAVEFORMS
MAX1553/54 toc12
VEN 5V/div
VFB
VOUT
L1 = 22μH
40ms/div
200mV/div
10V/div
VOUT 200mV/div
IL 200mA/div
2μs/div
L1 = 47μH, 4700pF CAPACITOR ACROSS LEDs
BRT STEP RESPONSE
MAX1553/54 toc13
VBRT 1V/div
VFB 200mV/div
VOUT 2V/div
20ms/div
L1 = 22μH,
VBRT = 0.5V TO 1.25V TO O.5V
www.maximintegrated.com
Maxim Integrated | 5
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