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PDF MAX1516 Data sheet ( Hoja de datos )
| Número de pieza | MAX1516 | |
| Descripción | (MAX1516 - MAX1518) TFT-LCD DC-DC Converters | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-3244; Rev 0; 4/04
EVAALVUAAILTAIOBNLEKIT
TFT-LCD DC-DC Converters with
Operational Amplifiers
General Description
The MAX1516/MAX1517/MAX1518 include a high-perfor-
mance step-up regulator, two linear-regulator controllers,
and high-current operational amplifiers for active-matrix
thin-film transistor (TFT) liquid-crystal displays (LCDs).
Also included is a logic-controlled, high-voltage switch
with adjustable delay.
The step-up DC-DC converter provides the regulated
supply voltage for the panel source driver ICs. The con-
verter is a high-frequency (1.2MHz) current-mode regu-
lator with an integrated 14V n-channel MOSFET that
allows the use of ultra-small inductors and ceramic
capacitors. It provides fast transient response to pulsed
loads while achieving efficiencies over 85%.
The gate-on and gate-off linear-regulator controllers
provide regulated TFT gate-on and gate-off supplies
using external charge pumps attached to the switching
node. The MAX1518 includes five high-performance
operational amplifiers, the MAX1517 includes three,
and the MAX1516 includes one operational amplifier.
These amplifiers are designed to drive the LCD back-
plane (VCOM) and/or the gamma-correction divider
string. The devices feature high output current
(±150mA), fast slew rate (13V/µs), wide bandwidth
(12MHz), and rail-to-rail inputs and outputs.
The MAX1516/MAX1517/MAX1518 are available in 32-
pin thin QFN packages with a maximum thickness of
0.8mm for ultra-thin LCD panels.
Applications
Notebook Computer Displays
LCD Monitor Panels
Automotive Displays
Ordering Information
PART
MAX1516ETJ
MAX1517ETJ
MAX1518ETJ
TEMP RANGE
-40°C to +100°C
-40°C to +100°C
-40°C to +100°C
PIN-PACKAGE
32 Thin QFN 5mm x 5mm
32 Thin QFN 5mm x 5mm
32 Thin QFN 5mm x 5mm
Features
♦ 2.6V to 5.5V Input Supply Range
♦ 1.2MHz Current-Mode Step-Up Regulator
Fast Transient Response to Pulsed Load
High-Accuracy Output Voltage (1.5%)
Built-In 14V, 2.4A, 0.16Ω N-Channel MOSFET
High Efficiency (90%)
♦ Linear-Regulator Controllers for VGON and VGOFF
♦ High-Performance Operational Amplifiers
±150mA Output Short-Circuit Current
13V/µs Slew Rate
12MHz, -3dB Bandwidth
Rail-to-Rail Inputs/Outputs
♦ Logic-Controlled, High-Voltage Switch with
Adjustable Delay
♦ Timer-Delay Fault Latch for All Regulator Outputs
♦ Thermal-Overload Protection
♦ 0.6mA Quiescent Current
Minimal Operating Circuit
VCN VCP
VIN
LX
IN
STEP-UP
CONTROLLER
FB
COMP
PGND
AGND
MAX1518
GATE-ON
CONTROLLER
DRVP
FBP
SRC
COM SWITCH
CONTROL
DRN
SUP
NEG1
OUT1 OP1
POS1
NEG2
GATE-OFF
CONTROLLER
REF
DEL
CTL
DRVN
FBN
REF
NEG4
OUT2 OP2
POS2
OP4 OUT4
POS4
NEG5
OUT3
POS3
OP3
OUT5
OP5
BGND
POS5
VMAIN
VCP
VGON
VCN
VGOFF
Pin Configurations appear at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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.
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1 page  
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TFT-LCD DC-DC Converters with
Operational Amplifiers
ELECTRICAL CHARACTERISTICS
(VIN = 3V, VSUP = 8V, PGND = AGND = BGND = 0, IREF = 25µA, TA = -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER
IN Supply Range
IN Undervoltage-Lockout
Threshold
SYMBOL
VIN
CONDITIONS
VUVLO VIN rising, typical hysteresis = 150mV
MIN
2.6
2.265
MAX
5.5
2.715
IN Quiescent Current
REF Output Voltage
MAIN STEP-UP REGULATOR
Output Voltage Range
Operating Frequency
FB Regulation Voltage
FB Line Regulation
FB Input Bias Current
FB Transconductance
LX On-Resistance
LX Current Limit
OPERATIONAL AMPLIFIERS
SUP Supply Range
SUP Supply Current
Input Offset Voltage
Input Common-Mode Range
VFB = VFBP = 1.4V, VFBN = 0,
LX not switching
IIN
VFB = 1.1V, VFBP = 1.4V, VFBN = 0,
LX switching
-2µA < IREF < 50µA, VIN = 2.6V to 5.5V
VMAIN
fOSC
VFB
RLX(ON)
ILIM
No load
VIN = 2.6V to 5.5V
VFB = 1.4V
∆ICOMP = 5µA
VFB = 1V, duty cycle = 65%
VSUP
ISUP
VOS
VCM
Buffer configuration,
VPOS_ = 4V, no load
MAX1518
MAX1517
MAX1516
(VNEG_, VPOS_, VOUT_) ≅ VSUP / 2
Output Voltage Swing, High
VOH
IOUT_ = 100µA
IOUT_ = 5mA
Output Voltage Swing, Low
Short-Circuit Current
VOL IOUT_ = -100µA
IOUT_ = -5mA
To VSUP / 2
Source
Sink
Output Source and Sink Current
(VNEG_ , VPOS_, VOUT_) ≅ VSUP / 2,
|∆VOS| < 10mV
GATE-ON LINEAR-REGULATOR CONTROLLER
FBP Regulation Voltage
VFBP IDRVP = 100µA
1.222
VIN
1020
1.212
-40
75
2.5
4.5
0
VSUP -
15
VSUP -
150
50
50
40
1.218
0.8
11
1.269
13
1380
1.250
±0.15
+40
300
250
3.5
13.0
4.8
3.0
1.1
12
VSUP
15
150
1.269
UNITS
V
V
mA
V
V
kHz
V
%/ V
nA
µS
mΩ
A
V
mA
mV
V
mV
mV
mA
mA
V
_______________________________________________________________________________________ 5
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TFT-LCD DC-DC Converters with
Operational Amplifiers
Pin Description (continued)
NAME
PIN
MAX1516 MAX1517 MAX1518
FUNCTION
20 N.C.
N.C.
OUT5
Operational-Amplifier 5 Output. Not Internally Connected for the MAX1517 and
MAX1516.
21 LX
LX
LX
N-Channel Power MOSFET Drain and Switching Node. Connect the inductor and
Schottky diode to LX and minimize the trace area for lowest EMI.
22 IN IN IN Supply Voltage Input. IN can range from 2.6V to 5.5V.
Step-Up Regulator Feedback Input. Regulates to 1.236V (nominal). Connect a resistive
23 FB FB FB voltage-divider from the output (VMAIN) to FB to analog ground (AGND). Place the
divider within 5mm of FB.
Step-Up Regulator Error-Amplifier Compensation Point. Connect a series RC from
24 COMP COMP COMP COMP to AGND. See the Loop Compensation section for component selection
guidelines.
25 FBP
26 DRVP
27 FBN
28 DRVN
29 DEL
30 CTL
31 DRN
32 COM
FBP
DRVP
FBN
DRVN
DEL
CTL
DRN
COM
FBP
DRVP
FBN
DRVN
DEL
CTL
DRN
COM
Gate-On Linear-Regulator Feedback Input. FBP regulates to 1.25V (nominal). Connect
FBP to the center of a resistive voltage-divider between the regulator output and AGND
to set the gate-on linear-regulator output voltage. Place the resistive voltage-divider
close to the pin.
Gate-On Linear-Regulator Base Drive. Open drain of an internal n-channel MOSFET.
Connect DRVP to the base of an external pnp pass transistor. See the Pass-Transistor
Selection section.
Gate-Off Linear-Regulator Feedback Input. FBN regulates to 250mV (nominal).
Connect FBN to the center of a resistive voltage-divider between the regulator output
and REF to set the gate-off linear-regulator output voltage. Place the resistive voltage-
divider close to the pin.
Gate-Off Linear-Regulator Base Drive. Open drain of an internal p-channel MOSFET.
Connect DRVN to the base of an external npn pass transistor. See the Pass-Transistor
Selection section.
High-Voltage Switch Delay Input. Connect a capacitor from DEL to AGND to set the
high-voltage switch startup delay.
High-Voltage Switch Control Input. When CTL is high, the high-voltage switch between
COM and SRC is on and the high-voltage switch between COM and DRN is off. When
CTL is low, the high-voltage switch between COM and SRC is off and the high-voltage
switch between COM and DRN is on. CTL is inhibited by the undervoltage lockout and
when the voltage on DEL is less than 1.25V.
Switch Input. Drain of the internal high-voltage back-to-back p-channel MOSFETs
connected to COM.
Internal High-Voltage MOSFET Switch Common Terminal. Do not allow the voltage on
COM to exceed VSRC.
______________________________________________________________________________________ 11
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| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet MAX1516.PDF ] | |
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