MAX1579 Maxim Integrated Products, MAX1579 Datasheet
MAX1579
Manufacturer Part Number
MAX1579
Description
Complete Bias and White LED Power Supplies for Small TFT Displays
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX1579.pdf
(13 pages)
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Part Number:
MAX1579ETG
Manufacturer:
MAXIM
Quantity:
14
The MAX1578/MAX1579 provide four regulated outputs
to meet all the voltage requirements for small active-
matrix TFT-LCD displays in handheld devices where
minimum external components and high efficiency are
required. Each device consists of three advanced
charge pumps for LCD bias power and a step-up con-
verter for driving up to 8 series white LEDs for back-
lighting. The input voltage range is from 2.7V to 5.5V.
The charge pumps provide fixed +5V, +15V, and -10V
for the LCD bias circuits. No external diodes are need-
ed. A high-efficiency, fractional (1.5x/2x) charge pump
followed by a low-dropout linear regulator provides +5V
to power the source driver. Automatic mode changing
achieves the highest conversion efficiency. Two multi-
stage, high-voltage charge pumps generate +15V and
-10V to provide V
unique clocking scheme and internal drivers, these
charge pumps eliminate parasitic charge-current glitch-
es and reduce maximum input current, resulting in low
electromagnetic emissions. The outputs are sequenced
during startup and shutdown. In shutdown, the outputs
are discharged to zero.
The high-efficiency inductor step-up converter drives
up to 8 white LEDs in series with a constant current to
provide backlighting. The series connection allows the
LED currents to be identical for uniform brightness and
minimizes the number of traces to the LEDs. The
MAX1578 regulates constant LED current over the
entire temperature range. The MAX1579 features a tem-
perature derating function to avoid overdriving the
white LEDs during high ambient temperatures, enabling
higher drive current below +42°C.
The MAX1578/MAX1579 are available in space-saving
24-lead 4mm x 4mm thin QFN packages.
19-3359; Rev 0; 8/04
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.
MAX1578ETG
MAX1579ETG
PART
Complete Bias and White LED Power Supplies
PDAs, Palmtops
Smart Phones
Internet Appliances
LCD Displays with White LED Backlight
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
ON
________________________________________________________________ Maxim Integrated Products
and V
Ordering Information
General Description
OFF
, respectively. Utilizing a
PIN-PACKAGE
24 Thin QFN 4mm x 4mm
(T2444-4)
24 Thin QFN 4mm x 4mm
(T2444-4)
Applications
♦ Four Regulators in One Package
♦ Bias Power Using Charge Pumps
♦ LED Backlight Power Using Boost Converter
♦ High Efficiency
♦ Uses Only Ceramic Capacitors and Only One
♦ Independent Enable Inputs for LED and Bias
♦ Thermal-Shutdown Protection
♦ 1µA Shutdown Current
♦ Tiny 4mm x 4mm Thin QFN Package
See Figure 3 for Typical Application Circuit.
for Small TFT Displays
Inductor
Power
+5V at 25mA for Source Driver
+15V at 100µA for V
-10V at 100µA for V
No External Diodes Required
Output Sequencing
POS, NEG, and MAIN Are Autodischarged
Series LED Connection for Uniform Illumination
Supports Up to 8 LEDs at 25mA (max)
900mW (max) Power
PWM or Analog Dimming Control
Overvoltage Protection
Low Input/Output Ripple
Soft-Start with Zero Inrush Current
Fast 1MHz PWM Operation for Small
Temperature Derating Function (MAX1579)
Bias: 83% (5.0V at 25mA, 15V/-10V at 100µA)
LED: 84% (6 LEDs at 20mA)
During Shutdown
Component Size
C1N
C2N
C2P
C1P
V
DD
IN
19
20
21
22
23
24
18
1
17
2
4mm x 4mm
THIN QFN
MAX1579
MAX1578
16
OFF
3
ON
Pin Configuration
15
4
14
5
www.DataSheet4U.com
13
6
12
11
10
9
8
7
Features
GND
ONBIAS
NEG
CD2
CD1
PMPB
1
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