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MAX1554ETA+T

P1-P3P4-P6P7-P9P10-P11
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 R
DSON
, 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 minimizes
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
Features
♦ Constant-Current Regulation for Even LED
Illumination
♦ Internal 40V MOSFET Switch Capable of Driving
10 LEDs
♦ Small, Low-Profile External Components
♦ 2.7V to 5.5V Input Range
♦ Up to 88% Efficiency Driving 6 LEDs
♦ Up to 82% Efficiency Driving 9 LEDs
(20mA, V
CC
= 3.6V)
♦ Analog or PWM Control of LED Intensity
♦ Optimized for Low Input Ripple
♦ Soft-Start to Minimize Inrush Current
♦ 3mm x 3mm 8-Pin TDFN Package
MAX1553/MAX1554
High-Efficiency, 40V Step-Up
Converters for 2 to 10 White LEDs
________________________________________________________________ Maxim Integrated Products 1
TOP VIEW
SS
BRT
6
7
8
0V
LX
3
2
1
EN
V
CC
GND
5 FB
4
TDFN
3mm x 3mm
MAX1553
MAX1554
Pin Configuration
Ordering Information
LX
SS
V
CC
FB
ON
OFF
BRT
GND
2.7V TO 5.5V
INPUT
OVEN
PWM
OR
DC CONTROL
MAX1553
MAX1554
WHITE
LEDS
Typical Operating Circuit
19-2875; Rev 1; 12/03
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.
EVALUATION KIT
AVAILABLE
PART
TEMP RANGE
PIN-PACKAGE
TOP
MARK
M A X1 5 5 3 E TA
-40°C to +85°C 8 TD FN 3m m x 3m m
AGX
M A X1 5 5 4 E TA
-40°C to +85°C 8 TD FN 3m m x 3m m
AGY
Dual Mode is a trademark of Maxim Integrated Products, Inc.
MAX1553/MAX1554
High-Efficiency, 40V Step-Up
Converters for 2 to 10 White LEDs
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= 3.3V, V
OV
= 0V, C
OUT
= 1µF, R
SENSE
= 10Ω, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
V
CC
, FB, OV to GND..............................................-0.3V to +6.0V
LX to GND ..............................................................-0.3V to +45V
EN, BRT, SS to GND...................................-0.3V to (V
CC
+ 0.3V)
I
LX
...................................................................................0.9A
RMS
Continuous Power Dissipation (T
A
= +70°C)
8-Pin 3mm x 3mm TDFN
(derate 24.4mW/°C above +70°C).............................1951mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER CONDITIONS MIN TYP
MAX
UNITS
MAX1553 2.7 5.5
Supply Voltage
MAX1554 3.15 5.50
V
Undervoltage Lockout Threshold V
CC
rising or falling, 35mV hysteresis typical 2.35 2.5 2.65 V
Not switching 0.33 0.65
Quiescent Current
Switching 0.44 0.9
mA
T
A
= +25°C 0.1 1
Shutdown Supply Current V
EN
= 0V
T
A
= +85°C 1
µA
OV Threshold Rising edge 1.18 1.25 1.33 V
T
A
= +25°C 1 200
OV Input Bias Current V
OV
= 1V
T
A
= +85°C 10
nA
BRT Input Resistance 0 < V
BRT
< 1.5V, EN = V
CC
200 400 600 kΩ
TIMING CONTROL
Maximum On-Time V
CC
= 3.3V 2.0 3.4 4.8 µs
On-Time Constant (K) t
ON
= K / V
CC
6.3 µs-V
Minimum Off-Time 150 250 350 ns
ERROR AMPLIFIER
V
BRT
= 1.25V 192 203 212
FB Threshold
V
BRT
= 3.3V 280
mV
T
A
= +25°C 15 200
FB Input Bias Current V
FB
= 1.0V
T
A
= +85°C 100
nA
N-CHANNEL SWITCH
LX On-Resistance 0.8 1.4 Ω
MAX1553/MAX1554
High-Efficiency, 40V Step-Up
Converters for 2 to 10 White LEDs
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS
(V
CC
= 3.3V, V
OV
= 0V, C
OUT
= 1µF, R
SENSE
= 10Ω, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 1)
Note 1: Specifications to -40°C are guaranteed by design, not production tested.
PARAMETER CONDITIONS MIN MAX
UNITS
MAX1553 2.7 5.5
Supply Voltage
MAX1554 3.15 5.50
V
Undervoltage Lockout Threshold V
CC
rising or falling, 35mV hysteresis typical 2.35 2.65 V
Not switching 0.65
Quiescent Current
Switching 0.9
mA
OV Threshold Rising edge 1.18 1.33 V
BRT Input Resistance 0 < V
BRT
< 1.5V, EN = V
CC
200 600 kΩ
TIMING CONTROL
Maximum On-Time V
CC
= 3.3V 2.0 4.8 µs
Minimum Off-Time 150 350 ns
ERROR AMPLIFIER
FB Threshold V
BRT
= 1.25V 192 217 mV
N-CHANNEL SWITCH
LX On-Resistance 1.4 Ω
MAX1553 300 600
LX Current Limit
MAX1554, V
CC
= 4.2V 600 1200
mA
SHUTDOWN CONTROL
EN Logic-Level High 1.8 V
EN Logic-Level Low 0.4 V
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 3.3V, V
OV
= 0V, C
OUT
= 1µF, R
SENSE
= 10Ω, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER CONDITIONS MIN TYP
UNITS
MAX1553 300 480 600
LX Current Limit
MAX1554, V
CC
= 4.2V 600 970
1200
mA
T
A
= +25°C 0.1 5
LX Leakage Current
V
LX
= 38V,
V
EN
= 0V
T
A
= +85°C 1
µA
SHUTDOWN CONTROL
EN Logic-Level High 1.8 V
EN Logic-Level Low 0.4 V
T
A
= +25°C 0.01 1
EN Input Current
V
EN
= 0V or 5.5V
T
A
= +85°C 0.1
µA
P1-P3P4-P6P7-P9P10-P11

MAX1554ETA+T

Mfr. #:
Buy MAX1554ETA+T
Manufacturer:
Maxim Integrated
Description:
LED Lighting Drivers 40V StepUp Converter for 2-10 White LEDs
Lifecycle:
New from this manufacturer.
Delivery:
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