MAX1848EKA-T Maxim Integrated Products, MAX1848EKA-T Datasheet

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MAX1848EKA-T

Manufacturer Part Number
MAX1848EKA-T
Description
LED Drivers HIgh Efficiency 13V Step-Up Converter fo
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX1848ETAT.pdf (9 pages)

Specifications of MAX1848EKA-T

Number Of Segments
3
Operating Supply Voltage
2.6 V to 5.5 V
Maximum Power Dissipation
777 mW
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
SOT-23
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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The MAX1848 drives white LEDs with a constant cur-
rent to provide backlight in cell phones, PDAs, and
other hand-held devices. The step-up converter topology
allows series connection of the white LEDs so that the
LED currents are identical for uniform brightness. This
configuration eliminates the need for ballast resistors
and expensive factory calibration. Other benefits
include greater simplicity, lower cost, higher efficiency,
and greater reliability.
This step-up PWM converter includes an internal, high-
voltage, low R
efficiency and maximum battery life. A single analog
voltage Dual Mode
brightness adjustment and on/off control. Fast 1.2MHz
current-mode PWM control 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.
The MAX1848 is available in space-saving 8-pin thin
QFN (3mm
19-2028; Rev 2; 8/05
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.
2.6V to 5.5V
Cell Phones and Smart Phones
PDAs, Palmtops, and Wireless Handhelds
e-Books and Subnotebooks
White LED Display Backlighting
OR DAC
LOGIC
3.3μF
C
0.15μF
C
✕
IN
COMP
Typical Application Circuit
3mm) and 8-pin SOT23 packages.
DSON
________________________________________________________________ Maxim Integrated Products
™
N-channel MOSFET switch for high
V+
CTRL
COMP
White LED Step-Up Converter in SOT23
input provides a simple means of
General Description
33μH
MAX1848
L1
PGND
GND
OUT
CS
LX
Applications
C
1μF
D1
OUT
R
SENSE
5Ω
♦ Constant Current Regulation for Uniform
♦ High 87% Efficiency
♦ Analog or Logic Control of LED Intensity
♦ 0.8W Output Power with Internal High-Voltage
♦ Small, Low-Profile External Components
♦ 2.6V to 5.5V Input Range
♦ 13V Maximum Output with Overvoltage Protection
♦ Optimized for Low Input Ripple
♦ Programmable Soft-Start
♦ 0.3µA Shutdown Current
♦ Small 8-pin Thin QFN (3mm
+ Denotes lead-free package.
Note: Hand soldering is not recommended for the MAX1848
SOT23 package.
Dual Mode is a trademark of Maxim Integrated Products, Inc.
MAX1848EKA-T
MAX1848ETA-T
MAX1848ETA+T
Illumination
MOSFET Switch
8-Pin SOT23 Packages
TOP VIEW
COMP
CTRL
PART
OUT
LX
1
2
4
3
+
MAX1848
SOT23
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
6
8
7
5
Ordering Information
V+
CS
GND
PGND
Pin Configuration
COMP
CTRL
OUT
LX
✕
1
2
3
4
PIN-
PACKAGE
8 SOT23
8 Thin QFN
(3mm
8 Thin QFN
(3mm
3mm) and
+
3mm x 3mm
THIN QFN
MAX1848
✕
✕
3mm)
3mm)
Features
6
8
7
5
V+
CS
GND
PGND
MARK
AAIM
TOP
ACR
ACR
1

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MAX1848EKA-T Summary of contents

Page 1

... Optimized for Low Input Ripple ♦ Programmable Soft-Start ♦ 0.3µA Shutdown Current ♦ Small 8-pin Thin QFN (3mm 8-Pin SOT23 Packages Applications PART MAX1848EKA-T MAX1848ETA-T MAX1848ETA+T + Denotes lead-free package. Note: Hand soldering is not recommended for the MAX1848 SOT23 package. TOP VIEW ...

Page 2

White LED Step-Up Converter in SOT23 ABSOLUTE MAXIMUM RATINGS V+ to GND ................................................................-0.3V to +6V PGND to GND .......................................................-0.3V to +0.3V LX, OUT to GND .....................................................-0.3V to +14V LX to OUT ...............................................................-14V to +0.3V CTRL to GND.......................................-0.3V to +6V or ...

Page 3

White LED Step-Up Converter in SOT23 DC ELECTRICAL CHARACTERISTICS (continued) ( 11V 33µH, C OUT OUT noted. Typical values are +25°C.) A PARAMETER N-CHANNEL SWITCH LX On-Resistance LX Leakage Current LX ...

Page 4

White LED Step-Up Converter in SOT23 (See Typical Application Circuit 3V +25°C, unless otherwise noted.) A EFFICIENCY vs. SUPPLY VOLTAGE 15mA OUT 88 2 LEDs LEDs 82 80 2.5 ...

Page 5

White LED Step-Up Converter in SOT23 (See Typical Application Circuit 3V +25°C, unless otherwise noted TRANSIENT RESPONSE CTRL V CTRL V OUT I LED C COMP 20ms/div PIN NAME Compensation Pin for Error ...

Page 6

White LED Step-Up Converter in SOT23 Detailed Description The MAX1848’s high efficiency and small size make it ideally suited to drive series-connected LEDs. It oper- ates as a boost DC-DC converter that controls output current rather than voltage. The MAX1848 ...

Page 7

White LED Step-Up Converter in SOT23 The output current and the number of LEDs in each leg affect the capacitance of C COMP minimum C values needed to stabilize the con- COMP verter in worst-case conditions. If further stability analy- ...

Page 8

White LED Step-Up Converter in SOT23 (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages PIN 1 I.D. DOT (SEE NOTE ...

Page 9

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 9 © 2005 Maxim Integrated Products ...

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