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PDF MAX17014 Data sheet ( Hoja de datos )
| Número de pieza | MAX17014 | |
| Descripción | Low-Cost Multiple-Output Power Supply | |
| Fabricantes | Maxim Integrated Products | |
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19-1045; Rev 1; 11/09
EVAALVUAAILTAIOBNLEKIT
Low-Cost Multiple-Output
Power Supply for LCD TVs
General Description
The MAX17014 multiple-output power-supply controller
generates all the supply rails for thin-film transistor
(TFT) liquid-crystal display (LCD) panels in TVs and
monitors operating from a regulated 12V input. It
includes a step-down and a step-up regulator, a posi-
tive and a negative charge pump, two operational
amplifiers, and a Dual Mode™ logic-controlled high-
voltage switch control block. The MAX17014 can oper-
ate from 8V to 16.5V input voltages and is optimized for
LCD TV panel and LCD monitor applications running
directly from 12V supplies.
The step-up and step-down regulators feature internal
power MOSFETs and high-frequency operation allow-
ing the use of small inductors and capacitors, resulting
in a compact solution. Both switching regulators use
fixed-frequency current-mode control architectures,
providing fast load-transient response and easy com-
pensation. A current-limit function for internal switches
and output-fault shutdown protect the step-up and
step-down power supplies against fault conditions. The
MAX17014 provides soft-start functions to limit inrush
current during startup. The MAX17014 provides
adjustable power-up timing.
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. The switch control block allows the
manipulation of the positive TFT gate driver voltage.
The MAX17014 includes two high-current operational
amplifiers designed to drive the LCD backplane
(VCOM). The amplifier features high output current
(±150mA), fast slew rate (100V/µs), wide bandwidth
(20MHz), and rail-to-rail inputs and outputs. A series
p-channel MOSFET is integrated to sequence power to
AVDD after the MAX17014 has proceeded through
normal startup, and provides True Shutdown™.
The MAX17014 is available in a small (7mm x 7mm),
low-profile (0.8mm), 48-pin thin QFN package and
operates over a -40°C to +85°C temperature range.
LCD TV Panels
LCD Monitor Panels
Applications
Features
o Optimized for 10.8V to 13.2V Input Supply
o 8V to 16.5V Input Supply Range
o Selectable Frequency (600kHz/1.2MHz)
o Current-Mode Step-Up Regulator
Built-In 20V, 3.3A, 110mΩ n-Channel MOSFET
High-Accuracy Output Voltage (1%)
True Shutdown
Fast Load-Transient Response
High Efficiency
3ms Internal Soft-Start
o Current-Mode Step-Down Regulator
Built-In 20V, 2.5A, 120mΩ n-Channel MOSFET
Fast Load-Transient Response
Adjustable Output Voltage Down to 1.25V
Skip Mode at Light Load
High Efficiency
3ms Internal Soft-Start
o Adjustable Positive and Negative Charge-Pump
Regulators
o Soft-Start and Timer-Delay Fault Latch for All
Outputs
o Logic-Controlled High-Voltage Integrated
Switches with Adjustable Delay
o Two High-Speed Operational Amplifiers
±150mA Short-Circuit Current
100V/µs Slew Rate
20MHz, -3dB Bandwidth
o 120mΩ p-Channel FET for AVDD Sequencing
o Input Undervoltage Lockout and Thermal-
Overload Protection
o 48-Pin, 7mm x 7mm Thin QFN Package
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX17014ETM+
-40°C to +85°C
48 Thin QFN
7mm x 7mm
+Denotes a lead(Pb)-free/RoHS-compliant package.
Dual Mode is a trademark of Maxim Integrated Products, Inc.
True Shutdown is a trademark of Maxim Integrated Products, Inc.
Simplified Operating Circuit and Pin Configuration appear
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.
1 page  
Low-Cost Multiple-Output
Power Supply for LCD TVs
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, VIN = VIN2 = 12V, AVDD = VOVIN = VSUP = 15V, TA = 0°C to +85°C. Typical values are at TA = +25°C, unless oth-
erwise noted.)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
AVDD SWITCH
SWI Supply Range
8.0
18.5
V
SWI Overvoltage Fault Threshold
SWI rising edge, 250mV typical hysteresis (Note 3) 18.50 19.25 20.00
V
SWI-SWO Switch Resistance
120 240
m
SUI-SWI Pullup Resistance
EN2 = GND
30
SUI Output Sink Current
EN2 = DEL2 = VL
24 30 36 μA
SWI-SUI Done Threshold
EN2 = DEL2 = VL
4.4 5.0 5.6
V
OPERATIONAL AMPLIFIERS
OVIN Supply Range
8 18 V
OVIN Overvoltage Fault Threshold OVIN rising edge, 250mV typical hysteresis (Note 3)
18
19
20
V
OVIN Supply Current
Buffer configuration, VPOSx = VOVIN / 2, no load
4.2 6 mA
Input Offset Voltage
2V < (VNEGx, VPOSx) < (VOVIN - 2V), TA = +25°C
-10
+10 mV
Input Bias Current
Input Common-Mode Voltage Range
Input Common-Mode Rejection
2V < (VNEGx, VPOSx) < (VOVIN - 2V)
2V < (VNEGx, VPOSx) < (VOVIN - 2V)
Output Voltage Swing High
IOUTx = 25mA
Output Voltage Swing Low
Large-Signal Voltage Gain
Slew Rate
-3dB Bandwidth
Short-Circuit Current
HIGH-VOLTAGE SWITCH ARRAY
IOUTx = -25mA
2V < (VNEGx, VPOSx) < (VOVIN - 2V)
2V < (VNEGx, VPOSx) < (VOVIN - 2V)
2V < (VNEGx, VPOSx) < (VOVIN - 2V)
Short to VOVIN / 2, sourcing
Short to VOVIN / 2, sinking
SRC Supply Range
SRC Supply Current
GON-to-SRC Switch On-Resistance
GON-to-SRC Switch Saturation Current
GON-to-DRN Switch On-Resistance
GON-to-DRN Switch Saturation Current
GON-to-GND Switch On-Resistance
CTL Input Low Voltage
VDLP = 2V, CTL = VL
(VSRC - VGON) > 5V
VDLP = 2V, CTL = GND
(VGON - VDRN) > 5V
DLP = GND, VGON = 5V
CTL Input High Voltage
CTL Input Current
CTL = GND or VL
CTL-to-GON Rising Propagation Delay 1k from DRN to GND, CTL = GND to VL step, no load
on GON, measured from VCTL = 2V to GON = 20%
CTL-to-GON Falling Propagation Delay 1k from DRN to GND, CTL = VL to GND step, no load
on GON, measured from VCTL = 0.6V to GON = 80%
MODE Switch On-Resistance
-1
0
100
VOVIN - VOVIN -
300 150
150
80
100
20
150
250
200
10
150 390
20
75 180
2.5 6.0
1.6
-1
100
100
1250
+1
VOVIN
300
44
500
20
50
12.5
0.6
+1
μA
V
dB
mV
mV
dB
V/μs
MHz
mA
V
μA
mA
mA
k
V
V
μA
ns
ns
_______________________________________________________________________________________ 5
5 Page 
Low-Cost Multiple-Output
Power Supply for LCD TVs
Typical Operating Characteristics (continued)
(Circuit of Figure 1. VIN = VINL = VSUP = 12V, AVDD = 16V, VGON = 34.5V, VGOFF = -6V, VOUT1 = 3.3V, TA = +25°C, unless other-
wise noted.)
STEP-UP REGULATOR CURRENT LIMIT
vs. INPUT VOLTAGE
6.0
L1 = 4.7µH
5.5 (CDEP134NP-4R8M, ISAT = 9.3A)
5.0
AVDD = 16V
4.5
4.0
3.5
3.0
2.5
8
AVDD = 18V
9 10 11 12 13 14 15 16
INPUT VOLTAGE (V)
TIME-DELAY LATCH
SWITCHING FREQUENCY
RESPONSE TO OVERLOAD
vs. INPUT VOLTAGE
MAX17014 toc11
1.200
A
0V
B
0V
C
0V
D
A: VOUT, 5V/div
B: VAVDD, 10V/div
C: VGON, 50V/div
E
0V
200ms/div
D: VGOFF, 5V/div
E: L1 INDUCTOR CURRENT,
5A/div
1.198
1.196
1.194
1.192
1.190
8
9 10 11 12 13 14
VIN (V)
5.05
5.04
5.03
5.02
5.01
5.00
4.99
4.98
4.97
4.96
4.95
0
VL LOAD REGULATION
EN1 = EN2 = VL
EN1 = EN2 = GND
20 40 60 80
LOAD CURRENT (mA)
100
REFERENCE VOLTAGE
LOAD REGULATION
1.251
EN1 = EN2 = VL
1.250
1.249
1.248
1.247
1.246 EN1 = EN2 = GND
1.245
0
50 100 150
LOAD CURRENT (µA)
200
POSITIVE CHARGE-PUMP REGULATOR
NORMALIZED LINE REGULATION
0.05
0.02
-0.01
ISRC = 0A
-0.04
-0.07
ISRC = 25mA
-0.10
10 11 12 13 14 15 16 17 18
VIN (V)
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MAX17014.PDF ] | |
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