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PDF MAX17079 Data sheet ( Hoja de datos )
| Número de pieza | MAX17079 | |
| Descripción | 4-Level Or 2-Level Logic To High-Voltage Level Shifter | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-2812; Rev 1; 3/10
EVAALVUAAILTAIOBNLEKIT
4-Level or 2-Level Logic to High-Voltage
Level Shifter for TFT LCD TV Display
General Description
The MAX17079 is a 7-channel logic-level input to high-
voltage output level shifter. Each channel has two
inputs plus a shared enable input. Each channel has
two outputs, which can be set to five output levels. Two
outputs are complementary to each other. The five out-
put levels are set by five supply rails that are common
to all 14 outputs.
The five supply rails include a typical TFT VCOM rail.
Two upper rails are always greater than VCOM, with
VH1 always greater than VH2. The two lower rails are
always less than VCOM, with VL1 always less than VL2.
Other supply rails are VLS (the typical TFT AVDD sup-
ply) and VCC (the logic supply). The MAX17079 can
also be configured as a two-level voltage shifter.
When EN is low, all 14 outputs connect to VCOM, and
when EN is high, the outputs are determined by their
inputs. The logic inputs are driven by the timing con-
troller. The output switches are typically 3Ω with low
propagation delays and fast rise times. The MAX17079
has a minimum dead time to prevent shoot-through cur-
rents between supplies. The MAX17079 has thermal
shutdown to protect against overheating, VCC under-
voltage lockout (UVLO), and VLS UVLO.
The MAX17079 is in a 40-pin, 6mm x 6mm, thin QFN
package, with exposed pad and a maximum height of
0.8mm.
Applications
TFT LCD TV Panels
Pin Configuration
TOP VIEW
30 29 28 27 26 25 24 23 22 21
OB1 31
20 OA7
OA1 32
ST 33
EP
19 OB7
18 VCOM
VH1 34
17 VL1
VH2 35
VLS 36
MAX17079
16 VL2
15 DGND
AGND 37
14 B7
VCC 38
13 A7
EN 39
12 B6
CH 40
11 A6
1 2 3 4 5 6 7 8 9 10
EP = EXPOSED PAD
THIN QFN
(6mm x 6mm)
Features
♦ 7-Channel Logic-Level Input to High-Voltage
Output Level Shifter
♦ Complementary Outputs in Each Channel
♦ VLS Input Range from 10V to 18V
♦ VCC Input Range from 2.3V to 3.6V
♦ 2-Level or 4-Level Operation
♦ Sequential or Combinational Logic
♦ 3Ω Output Switches
♦ 5-Level Output
♦ Short Propagation Delay (80ns typ)
♦ Fast Rise Time (30ns typ)
♦ Built-In Dead Time to Prevent Shoot-Through
♦ Thermal Shutdown
♦ VLS and VCC Undervoltage Lockout
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
MAX17079GTL+
-40°C to +105°C
40 TQFN-EP*
(6mm x 6mm)
T4066+5
*EP = Exposed paddle.
Simplified Operating Circuit
3.3V 10V 7V 6V 5V 2V 15V
SYSTEM
VCC VH1 VH2 VCOM VL2 VL1 VLS
OA1
OB1
A1
OA2
B1
OB2
A2
OA3
B2
A3 OB3
B3
A4
MAX17079
B4
A5
B5
A6
B6
A7
B7
OA4
OB4
OA5
OB5
OA6
OB6
OA7
AGND
OB7
EN DGND CH ST
PANEL
________________________________________________________________ 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  
4-Level or 2-Level Logic to High-Voltage
Level Shifter for TFT LCD TV Display
Typical Operating Characteristics (continued)
(Circuit of Figure 1. VIN = 12V, TA = +25°C, unless otherwise noted.)
VL2 SWITCH OUTPUT RESISTANCE
150
STATE 4
VVL2 = 5V
120
4-LEVEL SEQUENTIAL STARTUP
MAX17079 toc11
OA2
4-LEVEL COMBINATIONAL STARTUP
MAX17079 toc12
OA2
90
EN
60 A2
30 B2
0
0 10 20 30 40 50
IOA2 (mA)
OA2: 5V/div
A2: 5V/div
40μs/div
B2: 5V/div
EN: 2V/div
4-LEVEL SEQUENTIAL OPERATION
MAX17079 toc13
2-LEVEL SEQUENTIAL STARTUP
MAX17079 toc14
OB2
EN
OA2
OA2
OB2
EN
A2
B2
OA2: 5V/div
A2: 5V/div
40μs/div
B2: 5V/div
EN: 2V/div
2-LEVEL COMBINATIONAL STARTUP
MAX17079 toc15
EN
OA2
OB2
B2
A2
OB2: 5V/div
OA2: 5V/div
A2 A2
40μs/div
B2: 5V/div
A2: 5V/div
OA2: 5V/div
OB2: 5V/div
VCC QUIESCENT CURRENT
vs. TEMPERATURE
50
STATE 1
48
40μs/div
46
44
42
40
-40
-15 10 35 60
TEMPERATURE (°C)
85
A2: 5V/div
EN: 5V/div
OA2: 5V/div
OB2: 5V/div
40μs/div
A2: 5V/div
EN: 5V/div
VLS QUIESCENT CURRENT
vs. TEMPERATURE
0.40
0.35 STATE 2
0.30
0.25
0.20 STATE 1
0.15
0.10
-40
-15 10 35 60
TEMPERATURE (°C)
85
_______________________________________________________________________________________ 5
5 Page 
4-Level or 2-Level Logic to High-Voltage
Level Shifter for TFT LCD TV Display
Startup
The MAX17079 supply rail voltages should satisfy the
startup sequence shown in Figure 4. The supply rail
voltages should also satisfy the following conditions:
VLS ≥ VH1 ≥ (VH2, VL2, VCOM) ≥ VL1
For proper operation, EN should be HIGH only after all
the supply rails are ON.
Figure 4. Startup Sequence
VLS
VH1
VH2
VCOM
VL2
VCC
VL1
EN
TIME
Load Characteristics
The load has a typical characteristic of large TFT LCD
panels. During state transitions, a built-in dead time
prevents shoot-through current. During dead time as
the output is not connected, the output can be affected
by the panel load. To avoid voltage spikes during the
deadline, 1nF to 4.7nF capacitors can be added at
each output.
PCB Layout Guidelines
Careful PCB layout is important for proper operation.
Use the following guidelines for good PCB layout:
• The MAX17079 has a backside pad to dissipate
heat. Do not route any trace around or under the
backside pad.
• Ensure good decoupling of supply rails and put the
bypass capacitor for each power supply very close
to the pin.
• Create an analog ground island (AGND) that
includes the AGND pin and the VCC bypass capaci-
tor to ground. Connect AGND to the backside pad
directly under the IC. Create a power ground plane
(DGND) that includes the DGND pin, the remaining
supply rails bypass capacitor grounds, and output
bypass capacitors, if used in the system. Connect
DGND to the backside pad directly under the IC.
Other than the backside connection, avoid connect-
ing AGND and DGND.
PROCESS: BiCMOS
Chip Information
Package Information
For the latest package outline information and land patterns, go
to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in
the package code indicates RoHS status only. Package draw-
ings may show a different suffix character, but the drawing per-
tains to the package regardless of RoHS status.
PACKAGE TYPE PACKAGE CODE DOCUMENT NO.
40 TQFN
T4066+5
21-0141
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX17079.PDF ] | |
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