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MAX17126A PDF 데이터시트 ( Data , Function )

부품번호 MAX17126A 기능
기능 Multi-Output Power Supplies
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MAX17126A 데이터시트, 핀배열, 회로
www.DataSheet.co.kr
19-4681; Rev 1; 3/10
EVAALVUAAILTAIOBNLEKIT
Multi-Output Power Supplies with VCOM Amplifier
and High-Voltage Gamma Reference for LCD TVs
General Description
The MAX17126/MAX17126A generate all the supply rails
for thin-film transistor liquid-crystal display (TFT LCD)
TV panels operating from a regulated 12V input. They
include a step-down and a step-up regulator, a positive
and a negative charge pump, an operational amplifier,
a high-accuracy high-voltage gamma reference, and
a high-voltage switch control block. The MAX17126/
MAX17126A can operate from input voltages from 8V
to 16.5V and is optimized for an LCD TV panel running
directly from 12V supplies.
The step-up and step-down switching regulators feature
internal power MOSFETs and high-frequency opera-
tion allowing the use of small inductors and capacitors,
resulting in a compact solution. The step-up regulator
provides TFT source driver supply voltage, while the
step-down regulator provides the system with logic sup-
ply voltage. Both regulators use fixed-frequency current-
mode control architectures, providing fast load-transient
response and easy compensation. A current-limit func-
tion for internal switches and output-fault shutdown pro-
tects the step-up and step-down power supplies against
fault conditions. The MAX17126/MAX17126A provide
soft-start functions to limit inrush current during startup.
In addition, the MAX17126/MAX17126A integrate a con-
trol block that can drive an external p-channel MOSFET
to sequence power to source drivers.
The positive and negative charge-pump regulators pro-
vide TFT gate-driver supply voltages. Both output volt-
ages can be adjusted with external resistive voltage-
dividers. A logic-controlled, high-voltage switch block
allows the manipulation of the positive gate-driver supply.
The MAX17126/MAX17126A include one high-current
operational amplifier designed to drive the LCD back-
plane (VCOM). The amplifier features high output cur-
rent (Q200mA), fast slew rate (45V/Fs), wide bandwidth
(20MHz), and rail-to-rail outputs.
Also featured in the MAX17126/MAX17126A is a high-
accuracy, high-voltage adjustable reference for gamma
correction.
The MAX17126/MAX17126A are available in a small (7mm
x 7mm), ultra-thin (0.8mm), 48-pin thin QFN package and
operate over the -40NC to +85NC temperature range.
LCD TV Panels
Applications
Features
S 8.0V to 16.5V IN Supply-Voltage Range
S Selectable Frequency (500kHz/750kHz)
S Current-Mode Step-Up Regulator
Fast Load-Transient Response
High-Accuracy Output Voltage (1.0%)
Built-In 20V, 4.2A, 100mI MOSFET
High Efficiency
Adjustable Soft-Start
Adjustable Current Limit
Low Duty-Cycle Operation (13.2VIN - 13.5V AVDD)
S Current-Mode Step-Down Regulator
Fast Load-Transient Response
Built-In 20V, 3.2A, 100mI MOSFET
High Efficiency
3ms Internal Soft-Start
S Adjustable Positive Charge-Pump Regulator
S Adjustable Negative Charge-Pump Regulator
S Integrated High-Voltage Switch with Adjustable
Turn-On Delay
S High-Speed Operational Amplifier
Q200mA Short-Circuit Current
45V/µs Slew Rate
S High-Accuracy Reference for Gamma Buffer
Q1% Feedback Voltage
Up to 30mA Load Current
Low-Dropout Voltage 0.5V at 60mA
S External p-Channel Gate Control for AVDD
Sequencing
S PGOOD Comparator
S Input Undervoltage Lockout and Thermal-
Overload Protection
S 48-Pin, 7mm x 7mm, Thin QFN Package
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX17126ETM+ -40NC to +85NC 48 Thin QFN-EP*
MAX17126AETM+ -40NC to +85NC 48 Thin QFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Pin Configuration appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products   1
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.
Datasheet pdf - http://www.DataSheet4U.net/




MAX17126A pdf, 반도체, 판매, 대치품
www.DataSheet.co.kr
Multi-Output Power Supplies with VCOM Amplifier
and High-Voltage Gamma Reference for LCD TVs
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, VINVL= VIN2 = 12V, VVOP = VVREF_I = 15V, TA = 0°C to +85°C. Typical values are at TA = +25NC, unless oth-
erwise noted.)
PARAMETER
LX1 Current Limit
CONDITIONS
VFB1 = 1.1V, RCLIM = unconnected
VFB1 = 1.1V, with RCLIM at CLIM pin
CLIM Voltage
RCLIM = 60.5kI
Current-Sense Transresistance
LX1 On-Resistance
Soft-Start Period
CSS < 200pF
SS Charge Current
VSS = 1.2V
POSITIVE CHARGE-PUMP REGULATORS
GD_I Input Supply Range
GD_I Input Supply Current
VFBP = 1.5V (not switching)
GD_I Overvoltage Threshold
GD_I rising, 250mV typical hysteresis (Note 2)
FBP Regulation Voltage
FBP Line Regulation Error
VSUP = 11V to 16V, not in dropout
FBP Input Bias Current
VFBP = 1.5V, TA = +25°C
DRVP p-Channel MOSFET
On-Resistance
DRVP n-Channel MOSFET
On-Resistance
FBP Fault Trip Level
Falling edge
MIN
3.6
-20%
0.56
0.19
4
TYP
4.2
4.2 -
(68k/
RCLIM)
0.625
0.21
100
16
5
MAX
4.8
+20%
0.69
0.25
185
6
UNITS
A
V
V/A
mI
ms
FA
8.0
20.1
1.2375
-50
0.96
0.15
21
1.25
1.5
1
1.0
20
0.3
22
1.2625
0.2
+50
3
2
1.04
V
mA
V
V
%/V
nA
I
I
V
Positive Charge-Pump
Soft-Start Period
7-bit voltage ramp with filtering to prevent high peak
currents 500kHz frequency
750kHz frequency
NEGATIVE CHARGE-PUMP REGULATORS
FBN Regulation Voltage
FBN Input Bias Current
VREF - VFBN
VFBN = 0mV, TA = +25°C
FBN Line Regulation Error
VIN2 = 11V to 16V, not in dropout
DRVN PCH On-Resistance
DRVN NCH On-Resistance
FBN Fault Trip Level
Rising edge
0.99
-50
720
4
3
1.00
1.5
1
800
1.01
+50
0.2
3
2
880
ms
ms
V
nA
%/V
I
I
mV
Negative Charge-Pump Soft-
Start Period
7-bit voltage ramp with filtering to prevent high peak
currents 500kHz frequency
750kHz frequency
AVDD SWITCH GATE CONTROL
GD to GD_I Pullup Resistance EN = GND
GD Output Sink Current
EN = VL
GD Done Threshold
EN = VL, VGD_I - VGD
OPERATIONAL AMPLIFIERS
VOP Supply Range
3 ms
2
25 50 I
5 10 15 FA
5 6 7V
8 20 V
4   _______________________________________________________________________________________
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MAX17126A 전자부품, 판매, 대치품
www.DataSheet.co.kr
Multi-Output Power Supplies with VCOM Amplifier
and High-Voltage Gamma Reference for LCD TVs
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, VINVL= VIN2 = 12V, VVOP = VVREF_I = 15V, TA = 0°C to +85°C. Typical values are at TA = +25NC, unless oth-
erwise noted.)
PARAMETER
SWITCHING FREQUENCY SELECTION
FSEL Input Low Voltage
500kHz
FSEL Input High Voltage
750kHz
FSEL Pullup Resistance
CONDITIONS
MIN TYP MAX UNITS
0.6 V
1.6 V
1 MI
ELECTRICAL CHARACTERISTICS
(VINVL = VIN2 = 12V, VVOP = VVREF_I = 15V, TA = -40NC to +85NC.) (Note 3)
PARAMETER
GENERAL
INVL, IN2 Input-Voltage Range
SMPS Operating Frequency
CONDITIONS
FSEL = INVL or high impedance
FSEL = GND
INVL Undervoltage-Lockout
Threshold
INVL rising, 150mV typical hysteresis
VL REGULATOR
VL Output Voltage
IVL = 25mA, VFB1 = VFB2 = VFB = 1.1V, VFBN = 0.4V
(all regulators switching)
VL Undervoltage-Lockout
Threshold
VL rising, 50mV typical hysteresis
REFERENCE
REF Output Voltage
No external load
REF Undervoltage-Lockout
Threshold
Rising edge, 25mV typical hysteresis
STEP-DOWN REGULATOR
OUT Voltage in Fixed Mode
FB2 Voltage in Adjustable Mode
FB2 Adjustable Mode
Threshold Voltage
FB2 = GND, no load (Note 1)
VOUT = 2.5V, no load (Note 1)
Dual-mode comparator
Output Voltage Adjust Range
FB2 Fault Trip Level
Falling edge
LX2-to-IN2 nMOS Switch
On-Resistance
LX2-to-GND2 nMOS Switch
On-Resistance
BST-to-VL pMOS Switch
On-Resistance
LX2 Positive Current Limit
Maximum Duty Factor
MAX17126
MAX17126A
MIN TYP MAX UNITS
8
16.5
V
630
420
870
580
kHz
6.0 8.0 V
4.85
3.5
1.235
3.267
1.2375
0.10
1.5
0.96
6
40
2.50
3.0
70
5.15
4.3
V
V
1.265
1.2
V
V
3.333
1.2625
0.20
5
1.04
200
V
V
V
V
V
mI
23 I
110
3.90
4.0
85
I
A
%
_______________________________________________________________________________________   7
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MAX17126

Multi-Output Power Supplies

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Multi-Output Power Supplies

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