MAX8795A Datasheet PDF - Maxim Integrated Products
| Part Number | MAX8795A | |
| Description | TFT-LCD DC-DC Converter | |
| Manufacturers | Maxim Integrated Products | |
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19-0793; Rev 1; 6/07
EVAALVUAAILTAIOBNLEKIT
TFT-LCD DC-DC Converter with
Operational Amplifiers
General Description
The MAX8795A includes a high-performance step-up
regulator, two linear-regulator controllers, and five 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 20V 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 MAX8795A includes five high-performance
operational amplifiers. These amplifiers are designed to
drive the LCD backplane (VCOM) and/or the gamma-
correction divider string. The device features high out-
put current (±130mA), fast slew rate (45V/µs), wide
bandwidth (20MHz), and rail-to-rail inputs and outputs.
The MAX8795A is available in a lead-free, 32-pin, thin
QFN package with a maximum thickness of 0.8mm for
ultra-thin LCD panels, as well as in a 32-pin LQFP
package with 0.8mm pin pitch.
Applications
Notebook Computer Displays
www.DataSheetL4CUD.coMmonitor Panels
Automotive Displays
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
MAX8795AETJ+
-40°C to +85°C
32 Thin QFN
5mm x 5mm
T3255+3
MAX8795AGCJ+
-40°C to +105°C
32 LQFP
7mm x 7mm
C32+2
+Denotes a lead-free package.
Pin Configurations appear at end of data sheet.
Features
o 2.5V to 5.5V Input Supply Range
o 1.2MHz Current-Mode Step-Up Regulator
Fast Transient Response to Pulsed Load
High-Accuracy Output Voltage (1%)
Built-In 20V, 3A, 0.16Ω n-Channel MOSFET
High Efficiency (85%)
o Linear-Regulator Controllers for VGON and VGOFF
o High-Performance Operational Amplifiers
±130mA Output Short-Circuit Current
45V/µs Slew Rate
20MHz, -3dB Bandwidth
Rail-to-Rail Inputs/Outputs
o Logic-Controlled, High-Voltage Switch with
Adjustable Delay
o Timer-Delay Fault Latch for All Regulator Outputs
o Thermal-Overload Protection
o 0.6mA Quiescent Current
Minimal Operating Circuit
VCN
VIN
IN
STEP-UP
CONTROLLER
LX
FB
COMP
PGND
AGND
MAX8795A
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
EP BGND
POS5
VCP
VMAIN
VCP
VGON
VCN
VGOFF
________________________________________________________________ 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.
|
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TFT-LCD DC-DC Converter with
Operational Amplifiers
ELECTRICAL CHARACTERISTICS
(VIN = 3V, VMAIN = VSUP = 14V, PGND = AGND = BGND = 0, IREF = 25µA, TA = -40°C to +85°C, unless otherwise noted.) (Note 3)
PARAMETER
IN Supply Range
IN Undervoltage-Lockout
Threshold
IN Quiescent Current
REF Output Voltage
REF Undervoltage Lockout
Threshold
MAIN STEP-UP REGULATOR
Output Voltage Range
Operating Frequency
FB Regulation Voltage
FB Line Regulation
FB Transconductance
LX On-Resistance
LX Current Limit
OPERATIONAL AMPLIFIERS
SUP Supply Range
SUP Overvoltage Fault Threshold
SYMBOL
VIN (Note 2)
CONDITIONS
VUVLO VIN rising, typical hysteresis = 150mV
VFB = VFBP = 1.3V, VFBN = 0,
LX not switching
IIN
VFB = 1.2V, VFBP = 1.4V, VFBN = 0,
LX switching
No external load
Rising edge; typical hysteresis = 160mV
VMAIN
fOSC
VFB
RLX(ON)
ILIM
No load
VIN = 2.5V to 6V
∆ICOMP = ±2.5µA
ILX = 200mA
VFB = 1.2V, duty cycle = 75%
VSUP
MIN
2.5
2.05
1.218
VIN
900
1.198
75
2.5
6
18.0
MAX
6.0
2.45
UNITS
V
V
1.0
3
1.277
1.15
mA
V
V
18
1400
1.260
±0.4
280
260
3.5
V
kHz
V
%/ V
µS
mΩ
A
18 V
19.9 V
SUP Supply Current
ISUP
Buffer configuration, VPOS_ = VSUP / 2,
no load
5 mA
www.DatIanSphueteOt4ffUs.ectoVmoltage
VOS (VNEG_, VPOS_, VOUT_) ≅ VSUP / 2
12 mV
Input Common-Mode Voltage
Range
VCM
0
VSUP
V
Output Voltage Swing, High
Output Voltage Swing Low
Short-Circuit Current
VOH
VOL
IOUT_ = 5mA
IOUT_ = -5mA
To VSUP / 2
Source
Sink
VSUP -
100
75
75
mV
100
mA
GATE-ON LINEAR-REGULATOR CONTROLLER
FBP Regulation Voltage
VFBP IDRVP = 100µA
1.210
1.280
V
FBP Effective Load-Regulation
Error (Transconductance)
VDRVP = 10V, IDRVP = 50µA to 1mA
-1.5 %
FBP Line (IN) Regulation Error
DRVP Sink Current
IDRVP
IDRVP = 100µA, 2.5V < VIN < 6V
VFBP = 1.1V, VDRVP = 10V
10 mV
1 mA
_______________________________________________________________________________________ 5
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