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MAX1514

Description
TFT-LCD Power-Supply Controllers
File Size527KB，28 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
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MAX1514 Overview

TFT-LCD Power-Supply Controllers

MAX1514 Preview

19-3047; Rev 0; 10/03
KIT
ATION
EVALU
BLE
AVAILA
TFT-LCD Power-Supply Controllers
General Description
Features
♦
2.7V to 5.5V Input Supply Range
♦
Input-Supply Undervoltage Lockout
♦
Current-Mode Step-Up Controller
Fast Transient Response to Pulsed Load
High Efficiency
Lossless Current Sensing
430kHz/750kHz/1.5MHz Switching Frequency
♦
Linear-Regulator Controllers for V
GON
, V
GOFF
♦
Linear-Regulator Controller for Logic Supply
♦
High-Performance Buffer Amplifier (MAX1513 Only)
♦
Additional Linear-Regulator Controller
(MAX1513 Only)
♦
Power-Up Sequence and V
GON
Delay Control
♦
V
MAIN
, V
GON
, V
GOFF
, V
GAMMA
Shutdown Control
♦
Timer-Delay Fault Latch for All Outputs
♦
Thermal-Overload Protection
MAX1513/MAX1514
The MAX1513/MAX1514 provide complete power-sup-
ply solutions for active-matrix thin-film transistor (TFT)
liquid-crystal displays (LCDs). Both devices include a
high-performance step-up regulator controller, three lin-
ear-regulator controllers, and an adjustable delay block
for startup sequencing. The MAX1513 includes an
additional linear-regulator controller and a high-perfor-
mance buffer amplifier. The MAX1513/MAX1514 can
operate from 2.7V to 5.5V input supplies and provide
overload protection with timer delay latch on all the reg-
ulated outputs.
The step-up regulator controller drives an external N-
channel MOSFET to generate the regulated supply volt-
age for the panel source-driver ICs. Its current-mode
control architecture provides fast transient response to
pulsed loads. The high switching frequency (up to
1.5MHz) allows the use of ultra-small inductors and
ceramic capacitors while achieving efficiencies over 85%
using lossless current sensing. The internal soft-start lim-
its the input surge current during startup.
The gate-on and gate-off linear-regulator controllers of
the MAX1513/MAX1514 provide regulated TFT gate-on
and gate-off supplies. The gate-on supply is activated
after an adjustable delay following the step-up regulator.
The logic linear-regulator controller can be used to cre-
ate a low-voltage logic supply. The gamma linear-regula-
tor controller of the MAX1513 can be used to generate a
gamma-correction reference supply or another general-
purpose supply rail. The MAX1513’s high-performance
buffer amplifier can drive the LCD backplane (VCOM)
or the gamma-correction divider string.
The MAX1513/MAX1514 are available in 4mm
✕
4mm
20-pin thin QFN packages with a maximum thickness of
0.8mm, suitable for ultra-thin LCD panel design.
Ordering Information
PART
MAX1513ETP
MAX1514ETP
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
20 Thin QFN 4mm x 4mm
20 Thin QFN 4mm x 4mm
Minimal Operating Circuit
V
IN
IN
CS+
CS-
SDFR
GATE
GND
FB
V
MAIN
DEL
Applications
Notebook Computer Displays
LCD Monitors and TVs
Automotive Displays
V
MAIN
DRVG
V
GAMMA
FBG
V
LOGIC
DRVL
FBL
MAX1513
MAX1514
DRVP
FBP
V
GON
SUPB
DRVN
FBPB
FBN
V
GOFF
Pin Configuration appears at end of data sheet.
TO VCOM
OUTB
REF
________________________________________________________________
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.
TFT-LCD Power-Supply Controllers
MAX1513/MAX1514
ABSOLUTE MAXIMUM RATINGS
FB, FBP, FBN, FBG, FBL, IN, CS+,
CS-,
SDFR
to GND ...............................................-0.3V to +6V
DEL, GATE, REF to GND .............................-0.3V to (V
IN
+ 0.3V)
SUPB to GND .........................................................-0.3V to +14V
OUTB, FBPB to GND ..............................-0.3V to (V
SUPB
+ 0.3V)
DRVP, DRVG, DRVL to GND ..................................-0.3V to +30V
DRVN to GND .....................................(V
IN
- 28V) to (V
IN
+ 0.3V)
OUTB Continuous Output Current ....................................±75mA
Continuous Power Dissipation (T
A
= +70°C)
20-Pin TQFN (derate 16.9mW/°C above +70°C) .......1349mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V
IN
= 3V, V
SUPB
= 10V,
SDFR
= IN, C
REF
= 0.22µF,
T
A
= 0°C to +85°C.
Typical values are at T
A
= +25°C, unless
otherwise noted.)
PARAMETER
IN Supply Range
IN Undervoltage-Lockout
Threshold
IN Quiescent Current
IN Shutdown Current
REF Output Voltage
Thermal Shutdown
Duration to Trigger Fault Latch
MAIN STEP-UP CONTROLLER
SDFR
= IN
Operating Frequency
Oscillator Maximum Duty Cycle
FB Regulation Voltage
FB Fault Trip Level
FB Load Regulation
FB Line Regulation
FB Input Bias Current
CS+ Input Current
CS- Input Current
Current-Limit Threshold
Gate-Drive Output
Soft-Start Period
Soft-Start Step Size
GATE-ON LINEAR-REGULATOR CONTROLLER (REG P)
FBP Regulation Voltage
FBP Fault Trip Level
FBP Input Bias Current
V
FBP
I
DRVP
= 50µA
V
FBP
falling
V
FBP
= 1.5V
1.225
0.96
-250
1.250
1.00
1.275
1.04
+250
V
V
nA
t
SS
V
FB
V
CS+
- V
CS-
= 0
V
FB
falling
0 < (V
CS+
- V
CS-
) < 50mV
V
IN
= 2.7V to 5.5V
V
FB
= 1.5V
2.2V < V
CS+
< 6V
2.2V < V
CS-
< 6V
V
CS+
- V
CS-
, 2.2V < V
CS+
< 6V
High or low
-1
100
125
3
2.7
V
REF
/ 128
-100
f
OSC
SDFR
= REF
SDFR
= unconnected
80
1.237
0.96
1.275
0.60
1.500
0.75
0.43
85
1.25
1.00
-1
0.1
0.2
+100
90
+1
150
5
90
1.263
1.04
%
V
V
%
%/V
nA
µA
µA
mV
Ω
ms
V
1.725
0.90
MHz
SYMBOL
V
IN
V
UVLO
I
IN
350mV typical hysteresis
V
IN
rising
V
IN
falling
CONDITIONS
MIN
2.7
2.5
2.2
2.7
2.35
TYP
MAX
5.5
2.9
2.5
1.25
150
1.231
1.250
+160
15
43.6
1.269
UNITS
V
V
mA
µA
V
°C
ms
V
FB
= V
FBP
= V
FBL
= V
FBG
= 1.5V, V
FBN
= 0
V
SDFR
= 0, V
FBL
= 1.5V
-2µA < I
REF
< 100µA, 2.7V < V
IN
< 5.5V
Temperature rising
Hysteresis
2
_______________________________________________________________________________________
TFT-LCD Power-Supply Controllers
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V
IN
= 3V, V
SUPB
= 10V,
SDFR
= IN, C
REF
= 0.22µF,
T
A
= 0°C to +85°C.
Typical values are at T
A
= +25°C, unless
otherwise noted.)
PARAMETER
FBP Effective Load-Regulation
Error (Transconductance)
FBP Line (IN)-Regulation Error
DRVP Sink Current
DRVP Off-Leakage Current
DEL Charge Current
DEL Turn-On Threshold
DEL Discharge Switch
On-Resistance
Soft-Start Period
Soft-Start Step Size
GAMMA LINEAR-REGULATOR CONTROLLER (REG G, MAX1513 ONLY)
FBG Regulation Voltage
FBG to FB Regulation Voltage
Matching
FBG Fault Trip Level
FBG Input Bias Current
FBG Effective Load-Regulation
Error (Transconductance)
FBG Line (IN)-Regulation Error
DRVG Sink Current
DRVG Off-Leakage Current
Soft-Start Period
Soft-Start Step Size
LOGIC LINEAR-REGULATOR CONTROLLER (REG L)
FBL Regulation Voltage
FBL Fault Trip Level
FBL Input Bias Current
FBL Effective Load-Regulation
Error (Transconductance)
FBL Line (IN)-Regulation Error
DRVL Sink Current
DRVL Off-Leakage Current
Soft-Start Period
Soft-Start Step Size
t
SS
I
FBL
V
FBL
I
DRVL
= 0.8mA
V
FBL
falling
V
FBL
= 1.5V
V
DRVL
= 3V, I
DRVL
= 0.4mA to 8mA
I
DRVL
= 1mA, 2.7V < V
IN
< 5.5V
V
FBL
= 1.1V, V
DRVL
= V
IN
V
FBL
= 1.5V, V
DRVL
= 28V
15
20
0.15
2.7
V
REF
/ 128
10
1.225
0.96
-250
-1.5
1.250
1.00
1.275
1.04
+250
-2
8
V
V
nA
%
mV
mA
µA
ms
V
t
SS
I
DRVG
V
FBG
I
DRVG
= 0.35mA
I
DRVG
= 0.5mA, V
CS+
- V
CS-
= 0
V
FBG
falling
V
FBG
= 1.5V
V
DRVG
= 10V, I
DRVG
= 0.175mA to 3.5mA
I
DRVG
= 0.5mA, 2.7V < V
IN
< 5.5V
V
FBG
= 1.1V, V
DRVG
= 10V
V
FBG
= 1.5V, V
DRVG
= 28V
5
0.15
2.7
V
REF
/ 128
10
1.235
-1.2
0.96
-250
-1.5
1.00
1.250
1.265
+1.2
1.04
+250
-2
5
V
%
V
nA
%
mV
mA
µA
ms
V
t
SS
V
TH(DEL)
V
IN
= 3.0V, V
FB
= 0.8V
I
DRVP
SYMBOL
CONDITIONS
V
DRVP
= 10V, I
DRVP
= 25µA to 500µA
I
DRVP
= 50µA, 2.7V < V
IN
< 5.5V
V
FBP
= 1.1V, V
DRVP
= 10V
V
FBP
= 1.5V, V
DRVP
= 28V
During startup, V
DEL
= 1.0V
4
1.19
1
0.15
5
1.25
15
2.7
V
REF
/ 128
10
6
1.31
MIN
TYP
-1.5
MAX
-2
8
UNITS
%
mV
mA
µA
µA
V
Ω
ms
V
MAX1513/MAX1514
_______________________________________________________________________________________
3
TFT-LCD Power-Supply Controllers
MAX1513/MAX1514
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V
IN
= 3V, V
SUPB
= 10V,
SDFR
= IN, C
REF
= 0.22µF,
T
A
= 0°C to +85°C.
Typical values are at T
A
= +25°C, unless
otherwise noted.)
PARAMETER
FBN Regulation Voltage
FBN Fault Trip Level
FBN Input Bias Current
FBN Effective Load-Regulation
Error (Transconductance)
FBN Line (IN)-Regulation Error
DRVN Source Current
DRVN Off-Leakage Current
Soft-Start Period
Soft-Start Step Size
BUFFER AMPLIFIER
SUPB Supply Range
SUPB Supply Current
FBPB Input Offset Voltage
FBPB Input Bias Current
FBPB Input Common-Mode
Range
Common-Mode Rejection Ratio
Output-Voltage-Swing High
Output-Voltage-Swing Low
Short-Circuit Current
Power-Supply Rejection Ratio
Slew Rate
-3dB Bandwidth
CONTROL INPUTS AND OUTPUTS
SDFR
= IN (1.5MHz operation)
SDFR
Input Level
SDFR
= unconnected (430kHz operation)
SDFR
= REF (750kHz operation)
SDFR
= GND (LCD shutdown)
SDFR
= IN
SDFR
Input Current
SDFR
= REF
SDFR
= GND
-3.0
-3.0
0.9
×
V
IN
0.69
×
V
IN
1.00
0.77
×
V
IN
1.35
0.5
+3.0
µA
V
R
L
= 10kΩ, C
L
= 10pF
PSRR
DC, 6V
≤
V
SUPB
≤
13V, V
FBPB
= 4V
V
SUPB
I
SUPB
V
OS
I
BIAS
V
CM
CMRR
V
OH
V
OL
0 < V
FBPB
< V
SUPB
I
OUTB
= 5mA
I
OUTB
= -5mA
±50
60
No load, V
FBPB
= 4V
V
FBPB
= V
SUPB
/ 2
V
FBPB
= V
SUPB
/ 2
0
50
V
SUPB
-
150
V
SUPB
-
80
80
±150
80
10
12
150
4.5
0.75
0
13.0
1.1
12
50
V
SUPB
V
mA
mV
nA
V
dB
mV
mV
mA
dB
V/µs
MHz
t
SS
I
FBN
SYMBOL
V
FBN
I
DRVN
= 0.2mA
V
FBN
rising
V
FBN
= 0V
V
DRVN
= -10V, I
DRVN
= 0.1mA to 2mA
I
DRVN
= 0.2mA, 2.7V < V
IN
< 5.5V
V
FBN
= 0.3V, V
DRVN
= -10V
V
FBN
= -0.1V, V
DRVN
= -20V
5
0.1
2.7
V
REF
/ 128
10
CONDITIONS
MIN
220
380
-250
18
TYP
250
420
MAX
280
460
+250
25
5
UNITS
mV
mV
nA
mV
mV
mA
µA
ms
V
GATE-OFF LINEAR-REGULATOR CONTROLLER (REG N)
4
_______________________________________________________________________________________
TFT-LCD Power-Supply Controllers
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V
IN
= 3V, V
SUPB
= 10V,
SDFR
= IN, C
REF
= 0.22µF,
T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 1)
PARAMETER
IN Supply Range
IN Undervoltage-Lockout
Threshold
IN Quiescent Current
REF Output Voltage
MAIN STEP-UP CONTROLLER
Operating Frequency
FB Regulation Voltage
FB Line Regulation
FB Input Bias Current
CS+ Input Current
CS- Input Current
Current-Limit Threshold
Gate-Drive Output
FBP Regulation Voltage
FBP Input Bias Current
FBP Effective Load-Regulation
Error (Transconductance)
DRVP Sink Current
DEL Turn-On Threshold
FBG Regulation Voltage
FBG to FB Regulation Voltage
Matching
FBG Input Bias Current
FBG Effective Load-Regulation
Error (Transconductance)
DRVG Sink Current
I
DRVG
I
DRVP
V
TH(DEL)
V
FBG
I
DRVG
= 0.5mA
I
DRVG
= 0.5mA, V
CS+
- V
CS-
= 0
V
FBG
= 1.5V
V
DRVG
= 10V, I
DRVG
= 0.25mA to 5mA
V
FBG
= 1.1V, V
DRVG
= 10V
10
V
FBP
f
OSC
V
FB
SDFR
= IN
SDFR
= REF
V
CS+
- V
CS-
= 0
V
IN
= 2.7V to 5.5V
V
FB
= 1.5V
2.2V < V
CS+
< 6V
2.2V < V
CS-
< 6V
V
CS+
- V
CS-
, 2.2V < V
CS+
< 6V
High or low
I
DRVP
= 0.1mA
V
FBP
= 1.5V
V
DRVP
= 10V, I
DRVP
= 0.05mA to 1mA
V
FBP
= 1.1V, V
DRVP
= 10V
2
1.19
1.235
-1.2
-250
1.31
1.265
+1.2
+250
-2
1.225
-250
-1
100
-100
1.275
0.60
1.230
1.725
0.90
1.270
0.2
+100
90
+1
150
5
1.275
+250
-2
MHz
V
%/V
nA
µA
µA
mV
Ω
V
nA
%
mA
V
V
%
nA
%
mA
SYMBOL
V
IN
V
UVLO
I
IN
350mV typical
hysteresis
V
IN
rising
V
IN
falling
CONDITIONS
MIN
2.7
2.5
2.2
TYP
MAX
5.5
2.9
2.5
1.25
1.225
1.275
UNITS
V
V
mA
V
MAX1513/MAX1514
V
FB
= V
FBP
= V
FBL
= V
FBG
= 1.5V,
V
FBN
= 0
-2µA < I
REF
< 100µA, 2.7V < V
IN
< 5.5V
GATE-ON LINEAR-REGULATOR CONTROLLER (REG P)
GAMMA LINEAR-REGULATOR CONTROLLER (REG G, MAX1513 ONLY)
_______________________________________________________________________________________
5
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