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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1599 Datasheet

High-Efficiency / 26V Step-Up Converters for Two to Six White LEDs

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19-2731; Rev 1; 10/03
EVAALVUAAILTAIOBNLEKIT
High-Efficiency, 26V Step-Up Converters
for Two to Six White LEDs
General Description
The MAX1561/MAX1599 step-up converters drive up to
six white LEDs with a constant current to provide back-
light in cell phones, PDAs, and other hand-held
devices. The step-up converter topology allows series
connection of the white LEDs so the LED currents are
identical for uniform brightness. This configuration elim-
inates the need for ballast resistors and expensive fac-
tory calibration.
The MAX1561/MAX1599 include an internal, high-volt-
age, low-RDS(ON) N-channel MOSFET switch for high
efficiency and maximum battery life. A single Dual
Mode™ input provides a simple means of brightness
adjustment and on/off control. Fast 1MHz (500kHz for
the MAX1599) current-mode, pulse-width modulated
(PWM) operation allows for small input and output
capacitors and a small inductor while minimizing ripple
on the input supply/battery. Programmable soft-start
eliminates inrush current during startup.
Both devices are available in a space-saving, 8-pin 3mm
x 3mm thin DFN package with exposed paddle (EP).
Applications
Cell Phones and Smart Phones
PDAs, Palmtops, and Wireless Handhelds
e-Books and Subnotebooks
White LED Display Backlighting
Typical Operating Circuit
Features
o Accurate Current Regulation for Uniform
Illumination
o High Efficiency Up to 87%
o Flexible Analog or PWM Dimming Control
o Up to 900mW Output Power with Internal 30V
MOSFET Switch
o Fast 1MHz (MAX1561) or 500kHz (MAX1599) PWM
Operation
o Small, Low-Profile External Components
o 2.6V to 5.5V Input Range
o 26V (max) Output with Overvoltage Protection
o Optimized for Low 15mVP-P Input Ripple
o Soft-Start with Zero Inrush Current
o 0.3µA Shutdown Current
o Tiny 8-Pin 3mm x 3mm Thin DFN Package
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX1561ETA -40°C to +85°C 8 TDFN-EP*
MAX1599ETA -40°C to +85°C 8 TDFN-EP*
*EP = Exposed paddle.
TOP
MARK
ACS
AHG
Pin Configuration
INPUT 2.6V TO 5.5V
PWM OR
ANALOG
DIMMING
IN LX
OUT
MAX1561
MAX1599
CTRL PGND
COMP
CS
GND
OUTPUT UP TO 6 LEDs
TOP VIEW
MAX1561
MAX1599
OUT 1
IN 2
CTRL 3
CS 4
8 LX
7 PGND
6 GND
5 COMP
3mm × 3mm
THIN DFN
Dual Mode is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________ 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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1599 Datasheet

High-Efficiency / 26V Step-Up Converters for Two to Six White LEDs

No Preview Available !

High-Efficiency, 26V Step-Up Converters
for Two to Six White LEDs
ABSOLUTE MAXIMUM RATINGS
IN to GND .................................................................-0.3V to +6V
PGND to GND .......................................................-0.3V to +0.3V
LX, OUT to GND .....................................................-0.3V to +30V
CTRL to GND...................-0.3V to the lower of +6V or (VIN + 2V)
COMP, CS to GND.........................................-0.3 to (VIN + 0.3V)
ILX.............................................................................................1A
Continuous Power Dissipation (TA = +70°C)
3mm x 3mm 8-Pin TDFN
(derate 24.4mW/°C above +70°C) .............................1950mW
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
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.
ELECTRICAL CHARACTERISTICS
(VIN = 3V, VOUT = 20V, COUT = 0.1µF, CCOMP = 0.15µF, RSENSE = 7.5, VCTRL = 1.5V, Figure 1, TA = 0°C to +85°C, unless other-
wise noted. Typical values are at TA = +25°C.)
PARAMETER
Supply Voltage
UVLO Threshold
UVLO Hysteresis
Quiescent Current
Shutdown Supply Current
OVLO Threshold
OVLO Hysteresis
OUT Input Bias Current
Output Voltage Range
ERROR AMPLIFIER
CTRL to CS Regulation
CS Input Bias Current
CTRL Input Resistance
CTRL Dual-Mode Threshold
CTRL Dual-Mode Hysteresis
CTRL Shutdown Enable Delay
CS-to-COMP Transconductance
OSCILLATOR
Operating Frequency
Minimum Duty Cycle
Maximum Duty Cycle
CONDITIONS
VIN rising or falling
No switching
CTRL = GND, VOUT = VIN
VOUT rising
TA = +25°C
TA = +85°C
VOUT = 26V, VCTRL > 0.24V
VOUT = VIN, CTRL = GND
(Note 1)
VCTRL = 1V, VIN = 2.6V to 5.5V
VCS = VCTRL/10
VCTRL 1.0V
TA = +25°C
TA = +85°C
(Note 2)
VCOMP = 1.0V
MAX1561
MAX1599
PWM mode
Pulse skipping
CTRL = IN, CS = GND
MAX1561
MAX1599
MIN TYP
2.6
2.10 2.38
40
0.38
0.3
1
26 27
2
10 20
0.01
(VIN - VD1)
MAX
5.5
2.55
0.55
2
29
30
1
25.5
UNITS
V
V
mV
mA
µA
V
V
µA
V
0.095
290
100
6.5
13.6
32
0.100
0.01
0.03
500
170
5
8.2
16.4
50
0.105
1
780
240
10.5
21.0
82
V
µA
k
mV
mV
ms
µS
0.80 1.0 1.25
MHz
0.4 0.5 0.6
12
%
0
91 94
%
2 _______________________________________________________________________________________


Part Number MAX1599
Description High-Efficiency / 26V Step-Up Converters for Two to Six White LEDs
Maker Maxim
PDF Download

MAX1599 Datasheet PDF






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