MAX17061AEVKIT+ Maxim Integrated Products, MAX17061AEVKIT+ Datasheet

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MAX17061AEVKIT+

Manufacturer Part Number
MAX17061AEVKIT+
Description
Power Management Modules & Development Tools MAX17061A EVAL KIT MAX17061A EVAL KIT
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX17061AETI.pdf (24 pages)

Specifications of MAX17061AEVKIT+

Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX17061A is a high-efficiency driver for white light-
emitting diodes (LEDs). It is designed for large liquid-
crystal displays (LCDs) that employ an array of LEDs as
the light source. An internal switch current-mode step-up
controller drives the LED array, which can be configured
for up to eight strings in parallel and 10 LEDs per string.
Each string is terminated with ballast that achieves ±1.5%
current-regulation accuracy between strings, ensuring
even LED brightness. The MAX17061A has a wide input-
voltage range from 7.5V to 26V, and provides a fixed
25mA or adjustable 15mA to 30mA full-scale LED current.
The MAX17061A internally generates a DPWM signal for
accurate WLED dimming control. The DPWM frequency
is resistor programmable, while DPWM duty cycle is con-
trolled directly from an external PWM signal or through a
control word through the MAX17061A’s SMBus™ inter-
face. This DPWM control provides a dimming range with
8-bit resolution and supports Intel display-power-saving
technology (DPST) to maximize battery life.
The MAX17061A has multiple features to protect the
controller from fault conditions. Separate feedback
loops limit the output voltage under any circumstance,
ensuring safe operation. Once an open string is detect-
ed, the string is disabled while other strings operate
normally. The MAX17061A also features short LED
detection. The shorted strings are also disabled after a
2ms fault blanking interval. The controller features
cycle-by-cycle current limit to provide stable operation
and soft-start capability. If the MAX17061A is in current-
limit condition, the step-up converter is latched off after
an internal timer expires. A thermal-shutdown circuit
provides another level of protection.
The MAX17061A’s step-up controller features an internal
150mΩ (typ), 45V (max) power MOSFET with local cur-
rent-sense amplifier for accurate cycle-by-cycle current
limit. This architecture greatly simplifies the external cir-
cuitry and saves PCB space. Low-feedback voltage at
each LED string 625mV (typ) at 25mA LED current helps
reduce power loss and improve efficiency. The
MAX17061A features selectable switching frequency
(500kHz, 750kHz, or 1MHz), which enables a wide vari-
ety of applications that can trade off component size for
operating frequency.
The MAX17061A is available in a thermally enhanced
28-pin, 4mm x 4mm Thin QFN package.
19-4485; Rev 0; 2/09
Notebook, Subnotebook,
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
and Tablet Computer
Displays
________________________________________________________________ Maxim Integrated Products
General Description
Automotive Systems
Handy Terminals
SMBus for LCD Panel Applications
Applications
8-String White LED Driver with
o Accurate Dimming Control Using SMBus, PWM
o Dimming Range with 8-Bit Resolution
o Adjustable DPWM Frequency with 1.5% Accuracy
o Up to Eight Parallel Strings Multiple Series-
o ±1.5% Current Regulation Accuracy Between
o Low String Feedback Voltage: 625mV at 25mA
o Full-Scale LED Current Adjustable from 15mA to
o Open and Short LED Protections
o Output Overvoltage Protection
o 0.15Ω Internal HV Power MOSFET (45V max)
o Wide Input-Voltage Range from 4.5V to 26V
o 500kHz/750kHz/1MHz Selectable Switching
o Small 28-Pin, 4mm x 4mm, Thin QFN package
+ Denotes a lead(Pb)-free/RoHS-compliant package.
Pin Configuration appears at end of data sheet.
SMBus is a trademark of Intel Corp.
MAX17061AETI+
V
V
CC
5V
PWM
DATA
IN
CLK
Interface
Connected LEDs
Strings
LED Current
30mA, or Preset 25mA
Frequency
N.C.
PART
V
V
ISET
CCV
PWMI
PWMO
GND
OSC
SCL
SDA
FSET
DD
CC
MAX17061A
Simplified Operating Circuit
IN
EP
PGND1, 2
LX1, 2
L1
FB2
FB3
FB4
FB5
FB6
FB7
FB8
FB1
OV
D1
TEMP RANGE
-40
R1
R2
Ordering Information
o
C to +85
o
C
V
PIN-PACKAGE
OUT
28 Thin QFN
Features
1

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MAX17061AEVKIT+ Summary of contents

Page 1

... Notebook, Subnotebook, Automotive Systems and Tablet Computer Handy Terminals Displays ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 8-String White LED Driver with o Accurate Dimming Control Using SMBus, PWM ...

Page 2

White LED Driver with SMBus for LCD Panel Applications ABSOLUTE MAXIMUM RATINGS IN to GND ..............................................................-0.3V to +28V FB_, LX_ to GND ....................................................-0.3V to +45V PGND_ to GND......................................................-0.3V to +0. PWMI, SDA, SCL to GND ...

Page 3

SMBus for LCD Panel Applications ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 12V 0.022µ CCV T = 0°C to +85°C, unless otherwise noted. Typical values are PARAMETER INPUT LEAKAGE PWMI Leakage ...

Page 4

White LED Driver with SMBus for LCD Panel Applications ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 12V 0.022µ CCV T = 0°C to +85°C, unless otherwise noted. Typical values are ...

Page 5

SMBus for LCD Panel Applications ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 12V 0.022µ CCV T = -40°C to +85°C, unless otherwise noted. Typical values are PARAMETER BOOST CONVERTER LX On-Resistance ...

Page 6

White LED Driver with SMBus for LCD Panel Applications ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 12V 0.022µ CCV T = -40°C to +85°C, unless otherwise noted. Typical values are ...

Page 7

SMBus for LCD Panel Applications (Circuit of Figure 12V 0.022µ CCV 10 series x 4 parallel strings +25°C, unless otherwise noted.) A BOOST CONVERTER EFFICIENCY vs. INPUT VOLTAGE (BRIGHTNESS = 100%) ...

Page 8

White LED Driver with SMBus for LCD Panel Applications (Circuit of Figure 12V 0.022µ CCV 10 series x 4 parallel strings +25°C, unless otherwise noted.) A SWITCHING WAVEFORMS (V = ...

Page 9

SMBus for LCD Panel Applications (Circuit of Figure 12V 0.022µ CCV 10 series x 4 parallel strings +25°C, unless otherwise noted.) A LED-OPEN FAULT PROTECTION (BRIGHTNESS = 100%, LED OPEN ON ...

Page 10

White LED Driver with SMBus for LCD Panel Applications PIN NAME LED String 3 Cathode Connection. FB3 is the open-drain output of an internal regulator, which controls 1 FB3 current through FB3. FB3 can sink up to 30mA. If ...

Page 11

SMBus for LCD Panel Applications PIN NAME 22 V Boost Regulator MOSFET Gate Drive Supply. Bypass Control Supply Input capacitor of 1μF or greater. Step-Up Converter Compensation Pin. Connect a 0.022μF ceramic capacitor ...

Page 12

White LED Driver with SMBus for LCD Panel Applications Fixed-Frequency Step-Up Controller The MAX17061A’s fixed-frequency, current-mode, step-up controller automatically chooses the lowest active FB_ voltage to regulate the output voltage. Specifically, the difference between the lowest FB_ volt- age ...

Page 13

SMBus for LCD Panel Applications IN IN UVLO OSCILLATOR 3-LEVEL OSC COMPARATOR CCV REF ADJ ISET FSET PWMO "< = 1" A PWMI D "1" DIMMING 0x03 BLOCK DIAGRAM SDA SCL Figure 2. Control Circuit Block ...

Page 14

White LED Driver with SMBus for LCD Panel Applications The MAX17061A implements an IN UVLO function to safeguard the operation in the specified range. When IN pin voltage drops below its UVLO threshold (6.98V typ), the converter is shut ...

Page 15

SMBus for LCD Panel Applications Current-Source Fault Protection The MAX17061A performs a diagnostic test at startup. Open/short strings are disabled. LED fault open/short is also detected after startup. When one or more strings fails after startup, the corresponding current sources ...

Page 16

... PWM dimming mode, only the PWMI interface is used for brightness control; the MAX17061A cannot run without the SMBus interface. For sister products without the SMBus interface, contact MAXIM Integrated Products, Inc. Dimming Control Register Descriptions The MAX17061A includes four registers to monitor and control brightness, fault status, identification, and oper- ating mode ...

Page 17

SMBus for LCD Panel Applications Brightness control register: Address is 0x00. This register is both readable and writable for all 8 bits, BRT0–BRT7, which are used to control the LED brightness level. In SMBus dimming mode, an SMBus write byte ...

Page 18

White LED Driver with SMBus for LCD Panel Applications Fault/Status Register: Address is 0x02. This register has 6 status bits that allow monitoring the backlight con- troller’s operating state. Bit 6 and Bit 7 are reserved bits, and Bit ...

Page 19

SMBus for LCD Panel Applications Design Procedure All MAX17061A designs should be prototyped and test- ed prior to production. Table 4 provides a list of power components for the typical applications circuit. Table 5 lists component suppliers. External component value ...

Page 20

White LED Driver with SMBus for LCD Panel Applications The output current capability of the step-up converter is a function of current limit, input voltage, operating fre- quency, and inductor value. Because the slope com- pensation is used to ...

Page 21

SMBus for LCD Panel Applications The MAX17061A has a minimum inductor value limita- tion for a stable operation in CCM mode at low input voltage because of the internal fixed-slope compensa- tion. The minimum inductor value for stability is calcu- ...

Page 22

White LED Driver with SMBus for LCD Panel Applications RIPPLE ESR ( ) PEAK ESR COUT where I is the peak inductor current (see the PEAK Inductor Selection section). The output voltage ripple should be low ...

Page 23

SMBus for LCD Panel Applications FB Pin Maximum Voltage The current through each FB_ pin is controlled only during the step-up converter’s on-time. During the con- verter’s off-time, the current sources are turned off. The output voltage does not discharge ...

Page 24

... 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 ____________________ 24 © 2009 Maxim Integrated Products ...

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