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PDF MAX17126 Data sheet ( Hoja de datos )
| Número de pieza | MAX17126 | |
| Descripción | Multi-Output Power Supplies | |
| Fabricantes | Maxim Integrated Products | |
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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/
1 page  
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
VOP Overvoltage Fault
Threshold
VOP Supply Current
Input Offset Voltage
Input Bias Current
Input Common-Mode
Voltage Range
Input Common-Mode
Rejection Ratio
CONDITIONS
VVOP = rising, hysteresis = 200mV (Note 2)
Buffer configuration, VOPP = VOPN = VOP/2, no load
2V < (VOPP, VOPN ) < (VVOP - 2V)
2V < (VOPP, VOPN ) < (VVOP - 2V)
2V < (VOPP, VOPN ) < (VVOP - 2V)
Output Voltage Swing High
IOPO = 25mA
Output Voltage Swing Low
IOPO = -25mA
Large-Signal Voltage Gain
2V < (VOPP, VOPN ) < (VOP - 2V)
Slew Rate
2V < (VOPP, VOPN ) < (VOP - 2V)
-3dB Bandwidth
2V < (VOPP, VOPN ) < (VOP - 2V)
Short-Circuit Current
Short to VVOP/2, sourcing
Short to VVOP/2, sinking
HIGH-VOLTAGE SWITCH ARRAY
VGH Supply Range
VGH Supply Current
VGHM-to-VGH Switch
On-Resistance
VDLY1 = 2V, GVOFF = VL
VGHM-to-VGH Switch
Saturation Current
VVGH - VVGHM > 5V
VGHM-to-DRN Switch
On-Resistance
VDLY1 = 2V, GVOFF = GND
VGHM-to-DRN Switch
Saturation Current
VVGHM - VDRN > 5V
VGHM-to-GND Switch
On-Resistance
DLY1 = GND
GVOFF Input Low Voltage
GVOFF Input High Voltage
GVOFF Input Current
VGVOFF = 0V or VL, TA = +25°C
GVOFF-to-VGHM Rising
Propagation Delay
1kI from DRN to CPGND, VGVOFF = 0V to VL step, no
load on VGHM, measured from GVOFF = 2V to VGHM
= 20%
MIN
20.1
-1
0
VOP -
320
200
200
150
75
1.0
1.6
-1
TYP
21
2
3
80
VOP -
150
150
80
45
20
150
5
390
20
200
2.5
100
MAX
22
4
14
+1
VOP
UNITS
V
mA
mV
FA
V
dB
mV
300 mV
dB
V/Fs
MHz
mA
35 V
300 FA
10 I
mA
50 I
mA
4.0 kI
0.6 V
V
+1 FA
ns
GVOFF-to-VGHM Falling
Propagation Delay
THR-to-VGHM Voltage Gain
1kI from DRN to CPGND, VGVOFF = VL to 0V step, no
load on VGHM, DRN falling, no load on DRN and VGHM,
measured from VGVOFF = 0.6V to VGHM = 80%
9.4
200 ns
10
10.6
V/V
_______________________________________________________________________________________ 5
Datasheet pdf - http://www.DataSheet4U.net/
5 Page 
www.DataSheet.co.kr
Multi-Output Power Supplies with VCOM Amplifier
and High-Voltage Gamma Reference for LCD TVs
(TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics
STEP-DOWN REGULATOR EFFICIENCY
vs. LOAD CURRENT
85
80
750kHz
75
70
500kHz
65
60
55
50
0.10
1.00
LOAD CURRENT (A)
10.00
STEP-DOWN REGULATOR LOAD
TRANSIENT RESPONSE (0.3A TO 1.8A)
MAX17126 toc03
VOUT
0V (AC-COUPLED)
200mV/div
STEP-DOWN REGULATOR OUTPUT
VOLTAGE vs. LOAD CURRENT
3.350
3.325
750kHz
3.300
500kHz
3.275
0
0.42 0.80 1.20 1.60 2.00 2.40
LOAD CURRENT (A)
STEP-DOWN REGULATOR HEAVY-LOAD
SOFT-START (1A)
MAX17126 toc04
VIN
5V/div
VOUT
0V 1V/div
0A
IL2
1A/div
0A
L = 4.7FH
20Fs/div
ILOAD
1A/div
STEP-UP REGULATOR EFFICIENCY
vs. LOAD CURRENT
100
95
90
85 500kHz
80
75
70
65 750kHz
60
55
50
0.01
0.10 1.00
LOAD CURRENT (A)
10.00
0V
IL2
1A/div
0A
LX2
0A 10V/div
4ms/div
16.445
STEP-UP REGULATOR OUTPUT
VOLTAGE vs. LOAD CURRENT
16.440
16.435
16.430
16.425
16.420
750kHz
500kHz
16.415
16.410
0
0.5 1.0 1.5 2.0
LOAD CURRENT (A)
2.5
______________________________________________________________________________________ 11
Datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 34 Páginas | |
| PDF Descargar | [ Datasheet MAX17126.PDF ] | |
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