19-2812; Rev 0; 2/08 KIT ATION EVALU E L B A AVAIL 4-Level or 2-Level Logic to High-Voltage Level Shifter for TFT LCD TV Display The MAX17079 is a 7-channel logic-level input to highvoltage 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 output 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 supply) 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 controller. 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 currents between supplies. The MAX17079 has thermal shutdown to protect against overheating, VCC undervoltage 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. Features o 7-Channel Logic-Level Input to High-Voltage Output Level Shifter o Complementary Outputs in Each Channel o VLS Input Range from 10V to 18V o VCC Input Range from 2.3V to 3.6V o 2-Level or 4-Level Operation o Sequential or Combinational Logic o 3Ω Output Switches o 5-Level Output o Short Propagation Delay (80ns typ) o Fast Rise Time (30ns typ) o Built-In Dead Time to Prevent Shoot-Through o Thermal Shutdown o VLS and VCC Undervoltage Lockout Ordering Information PART PINPACKAGE TEMP RANGE MAX17079GTL+ -40°C to +105°C PKG CODE 40 TQFN-EP* T4066+5 (6mm x 6mm) *EP = Exposed paddle. Simplified Operating Circuit 3.3V 10V 7V 6V 5V 2V 15V VCC VH1 VH2 VCOM VL2 VL1 VLS Applications TFT LCD TV Panels Pin Configuration OB1 OB6 OA6 OB5 OA5 OB4 OA4 OB3 OA3 OB2 OA2 A1 TOP VIEW OA1 B1 30 29 28 27 26 25 24 23 22 21 A2 OA2 OB2 OA3 OB1 31 20 OA7 B2 OA1 32 19 OB7 A3 OB3 B3 OA4 EP ST 33 18 VCOM 17 VL1 VH1 34 A4 16 VL2 VH2 35 OB4 MAX17079 B4 MAX17079 VLS 36 15 DGND OA5 A5 AGND 37 14 B7 VCC 38 13 A7 EN 39 12 B6 CH 40 11 A6 10 B5 9 A5 8 B4 7 A4 6 B3 5 A3 4 B2 3 A2 2 B1 A1 1 PANEL SYSTEM OB5 B5 A6 OA6 B6 OB6 A7 OA7 B7 OB7 EP = EXPOSED PAD THIN QFN (6mm x 6mm) AGND EN DGND CH ST ________________________________________________________________ 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. MAX17079 General Description MAX17079 4-Level or 2-Level Logic to High-Voltage Level Shifter for TFT LCD TV Display ABSOLUTE MAXIMUM RATINGS VCC to AGND...........................................................-0.3V to +7V Ax, Bx, CH, ST, EN to AGND....................................-0.3V to +7V DGND to AGND.....................................................-0.3V to +0.3V VLS to DGND..........................................................-0.3V to +20V VH1, VH2, VL1, VL2, VCOM to DGND ........-0.3V to (VLS + 0.3V) OAx, OBx to DGND ..........................(VL1 - 0.3V) to (VH1 + 0.3V) OBx, OAx RMS Current.......................................................50mA VH1, VH2, VL1, VL2 RMS Current.....................................300mA VH1, VL2, VCOM, to DGND.............(VL1 - 0.3V) to (VH1 + 0.3V) Continuous Power Dissipation (TA = +70°C) 40-Pin, 6mm x 6mm TQFN (derate 35.7mW/°C above +70°C) .........................2857.1mW Operating Temperature Range .........................-40°C to +105°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, VVCC = 3.3V, VVLS = 15V, VVH1 = 10V, VVH2 = 7V, VVCOM = 6V, VVL2 = 5V, VVL1 = 2V, TA = -40°C to +105°C. Typical values are at TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER CONDITIONS MIN TYP MAX UNITS 3.6 V 2.2 V 18 V 9.0 V GENERAL VCC Input Voltage Range 2.3 VCC Input Undervoltage Lockout Rising edge, 200mV typical hysteresis 1.8 VLS Input Voltage Range 10 VLS Input Undervoltage Lockout Rising edge, 500mV typical hysteresis 8.0 2.0 8.5 VH1 Input Voltage Range 4 VVLS V VH2 Input Voltage Range 0 VVLS - 4 V VL2 Input Voltage Range 0 VVLS - 4 V VL1 Input Voltage Range 0 VVLS - 4 V VCOM Input Voltage Range 4 VVLS - 4 VCC Quiescent Current V 50 μA VLS Quiescent Current All channels in STATE 2 300 μA VH1 Quiescent Current All channels in STATE 1 or STATE 3 150 μA VH2 Quiescent Current All channels in STATE 2 or STATE 4 -125 μA VL1 Quiescent Current All channels in STATE 1 or STATE 3 -90 μA VL2 Quiescent Current All channels in STATE 2 or STATE 4 -130 μA INPUTS AND OUTPUTS Logic-Input Low Voltage EN, CH, ST, Ax, Bx Logic-Input High Voltage EN, CH, ST, Ax, Bx 0.3 x VVCC 0.7 x VVCC V V Logic-Low Input Current EN, CH, ST, Ax, Bx to AGND Logic-High Input Current VCC to EN, CH, ST, Ax, Bx VH1 - OAx, VH1 - OBx On-Resistance VVLS = 10V, VVH1 = 5V, I(OAx, OBx) = 20mA 3 VH2 - OAx, VH2 - OBx On-Resistance VVLS = 10V, VVH2 = 5V, I(OAx, OBx) = 20mA 3 2 -1 10.0 16.5 _______________________________________________________________________________________ +1 μA 30.0 μA 4-Level or 2-Level Logic to High-Voltage Level Shifter for TFT LCD TV Display (Circuit of Figure 1, VVCC = 3.3V, VVLS = 15V, VVH1 = 10V, VVH2 = 7V, VVCOM = 6V, VVL2 = 5V, VVL1 = 2V, TA = -40°C to +105°C. Typical values are at TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER CONDITIONS MIN TYP MAX UNITS VL1 - OAx, VL1 - OBx On-Resistance VVLS = 10V, VVL1 = 5V, I(OAx, OBx) = 20mA 3 VL2 - OAx, VL2 - OBx On-Resistance VVLS = 10V, VVL2 = 5V, I(OAx, OBx) = 20mA 3 VVLS = 10V, VVH2 = 6V, VVL2 = 4V, I(OAx, OBx) = 20mA (VH2 to OAx) - (VL2 to OAx), (VH2 to OBx) - (VL2 to OBx) -0.5 0 +0.5 VVLS = 10V, VVH1 = 6V, VVL1 = 4V, I(OAx, OBx) = 20mA (VH1 to OAx) - (VL1 to OAx), (VH1 to OBx) - (VL1 to OBx) -1.5 0 +1.5 On-Resistance Difference VCOM - OAx, VCOM - OBx On-Resistance VVLS = 10V, VVCOM = 5V, I(OAx, OBx) = 20mA 15 TIMING tHH, tHL, tLH, tLL, refers to the minimum duration of input for a given state 500 EN Setup Time t ES -50 +100 ns EN Falling Delay t ER 70 200 ns Output Delay Time tD, no load, input to 10% output 80 200 ns Output Rise Time tR, no load, rails of 0V and 18V, measured from 2V to 16V 30 100 ns Output Fall Time tF, no load, rails of 0V and 18V, measured from 16V to 2V 30 100 ns Input Pulse Width t PW, no load, refers to the minimum high or low time of Ax or Bx Input Pulse Width ns 500 ns Note 1: TA = -40°C specifications are guaranteed by design, not production tested. Production test is done at TA = +25°C and TA = +85°C. Timing Diagram tES EN Ax tPW tLH Ax Bx tD tLL tHH tD tHL Bx OAx tF OBx tER OAx tR _______________________________________________________________________________________ 3 MAX17079 ELECTRICAL CHARACTERISTICS (continued) Typical Operating Characteristics (Circuit of Figure 1. VIN = 12V, TA = +25°C, unless otherwise noted.) PROPAGATION DELAY (STATE 2 - STATE 3) PROPAGATION DELAY (STATE 1 - STATE 2) ENABLE PROPAGATION DELAY MAX17079 toc01 MAX17079 toc03 MAX17079 toc02 OB2 EN OB2 OA2 OA2 OA2 B2 OB2 B2 A2 A2 20ns/div 20ns/div OB2: 5V/div OA2: 5V/div PROPAGATION DELAY (STATE 3 - STATE 4) OB2: 5V/div OA2: 5V/div B2: 5V/div A2: 5V/div PROPAGATION DELAY (STATE 4 - STATE 1) MAX17079 toc04 VCOM SWITCH OUTPUT RESISTANCE MAX17079 toc05 OB2 B2: 5V/div A2: 5V/div 1.0 MAX17079 toc06 40ns/div EN: 2V/div OA2: 5V/div OB2: 5V/div STATE 0 VVCOM = 6V OB2 OA2 OA2 B2 B2 VVCOM - VOA2 (V) 0.8 0.6 0.4 0.2 A2 A2 0 B2: 5V/div A2: 5V/div OB2: 5V/div OA2: 5V/div VH2 SWITCH OUTPUT RESISTANCE 90 60 30 120 90 60 10 20 30 IOA2 (mA) 40 50 40 50 60 70 STATE 3 VVL1 = 2V 120 90 60 30 0 0 30 VL1 SWITCH OUTPUT RESISTANCE 30 0 4 STATE 1 VVH1 = 10V VVH1 - VOA2 (mV) 120 20 150 VOA2 - VVL1 (mV) STATE 2 VVH2 = 7V 10 IOA2 (mA) VH1 SWITCH OUTPUT RESISTANCE 150 MAX17079 toc07 150 0 B2: 5V/div A2: 5V/div MAX17079 toc08 OB2: 5V/div OA2: 5V/div 20ns/div MAX17079 toc09 20ns/div VVH2 - VOA2 (mV) MAX17079 4-Level or 2-Level Logic to High-Voltage Level Shifter for TFT LCD TV Display 0 0 10 20 30 IOA2 (mA) 40 50 0 10 20 30 IOA2 (mA) _______________________________________________________________________________________ 40 50 4-Level or 2-Level Logic to High-Voltage Level Shifter for TFT LCD TV Display MAX17079 toc12 MAX17079 toc11 MAX17079 toc10 STATE 4 VVL2 = 5V 120 VOA2 - VVL2 (mV) 4-LEVEL COMBINATIONAL STARTUP 4-LEVEL SEQUENTIAL STARTUP VL2 SWITCH OUTPUT RESISTANCE 150 OA2 OA2 EN EN 90 60 A2 A2 30 B2 B2 0 0 10 20 30 40 40μs/div 40μs/div 50 OA2: 5V/div A2: 5V/div IOA2 (mA) 4-LEVEL SEQUENTIAL OPERATION OA2: 5V/div A2: 5V/div B2: 5V/div EN: 2V/div 2-LEVEL COMBINATIONAL STARTUP 2-LEVEL SEQUENTIAL STARTUP MAX17079 toc13 B2: 5V/div EN: 2V/div MAX17079 toc15 MAX17079 toc14 OB2 EN EN OA2 OA2 OB2 OB2 A2 A2 OA2 B2 A2 40μs/div 40μs/div 40μs/div B2: 5V/div A2: 5V/div OA2: 5V/div OB2: 5V/div OA2: 5V/div OB2: 5V/div A2: 5V/div EN: 5V/div VCC QUIESCENT CURRENT vs. TEMPERATURE VLS QUIESCENT CURRENT vs. TEMPERATURE 0.40 MAX17079 toc16 50 STATE 1 48 A2: 5V/div EN: 5V/div 0.35 MAX17079 toc17 OB2: 5V/div OA2: 5V/div STATE 2 IVLS (mA) IVCC (μA) 0.30 46 44 0.25 0.20 42 STATE 1 0.15 0.10 40 -40 -15 10 35 TEMPERATURE (°C) 60 85 -40 -15 10 35 60 85 TEMPERATURE (°C) _______________________________________________________________________________________ 5 MAX17079 Typical Operating Characteristics (continued) (Circuit of Figure 1. VIN = 12V, TA = +25°C, unless otherwise noted.) 4-Level or 2-Level Logic to High-Voltage Level Shifter for TFT LCD TV Display MAX17079 Pin Description 6 PIN NAME FUNCTION 1 A1 Level Shifter Logic Input 2 B1 Level Shifter Logic Input 3 A2 Level Shifter Logic Input 4 B2 Level Shifter Logic Input 5 A3 Level Shifter Logic Input 6 B3 Level Shifter Logic Input 7 A4 Level Shifter Logic Input 8 B4 Level Shifter Logic Input 9 A5 Level Shifter Logic Input 10 B5 Level Shifter Logic Input 11 A6 Level Shifter Logic Input 12 B6 Level Shifter Logic Input 13 A7 Level Shifter Logic Input 14 B7 Level Shifter Logic Input 15 DGND 16 VL2 Output Supply Rail. Bypass VL2 to DGND with a 0.1μF capacitor. 17 VL1 Output Supply Rail. Bypass VL1 to DGND with a 0.1μF capacitor. 18 VCOM 19 OB7 Level Shifter Output 20 OA7 Level Shifter Output 21 OB6 Level Shifter Output 22 OA6 Level Shifter Output 23 OB5 Level Shifter Output 24 OA5 Level Shifter Output 25 OB4 Level Shifter Output 26 OA4 Level Shifter Output 27 OB3 Level Shifter Output 28 OA3 Level Shifter Output 29 OB2 Level Shifter Output 30 OA2 Level Shifter Output 31 OB1 Level Shifter Output 32 OA1 Output Supply Ground Connection Output Supply Rail. Bypass VCOM to DGND with a 0.1μF capacitor. Level Shifter Output State/Combinational Logic Select. Connect ST to VCC for state logic and to DGND for combinational logic operation. 33 ST 34 VH1 35 VH2 Output Supply Rail. Bypass VH2 to DGND with a 0.1μF capacitor. 36 VLS Upper Supply Rail. Bypass VLS to DGND with a 0.1μF capacitor. 37 AGND 38 VCC Output Supply Rail. Bypass VH1 to DGND with a 0.1μF capacitor. Input Logic Ground Connection Input Logic Supply Connection. Bypass to AGND with a minimum 0.1μF capacitor. _______________________________________________________________________________________ 4-Level or 2-Level Logic to High-Voltage Level Shifter for TFT LCD TV Display PIN NAME 39 EN Enable Input. All outputs connect to VCOM when EN is low. FUNCTION 40 CH Select Input for Two Level/Four Level. Connect CH to VCC for two-level operation and tie CH to DGND or let it float for four-level operation. For two-level operation, power VH2 and VL2 and control the outputs with Ax inputs. Bx inputs can be left floating or be connected to AGND. — EP Exposed Pad. Connect the exposed backside pad to AGND and DGND. Detailed Description The MAX17079 is a 7-channel level shifter that converts a 2-bit logic-level input to a five-level high-voltage output. The outputs are connected to the four output rails (VH1, VH2, VL1, VL2) through 3Ω switches and to the fifth rail (VCOM) through a 15Ω switch. The output rails lie between DGND and the upper supply rail (VLS). The MAX17079 has two modes of operation. When ST = VCC, it operates in sequential mode and when ST = AGND, it operates in combinational mode. The MAX17079 can operate in either two-level output or four-level output configuration. In four-level output mode, the output can connect to VH1, VH2, VL2, or VL1, and in two-level output mode, the output can connect to VH2 or VL2. Connect CH to AGND for four-level operation and connect CH to VCC for two-level operation. The output supply rail voltages should satisfy the following condition at all times: VLS ≥ VH1 ≥ (VH2, VL2, VCOM) ≥ VL1 The MAX17079 has built-in dead time to avoid shootthrough current. The propagation delay between input and output is 80ns and the rise time is 30ns. Figure 1 is the MAX17079 typical operating circuit and Figure 2 shows the functional diagram. Four-Level Combinational Logic Connect CH and ST to AGND for four-level combinational operation. If EN is LOW or VCC is less than UVLO or VLS is less than its UVLO, the outputs are in STANDBY and the outputs connect to VCOM. After EN is HIGH or VCC is greater than UVLO and VLS is greater than its UVLO, the outputs are ready to respond to logic inputs at Ax, Bx. If EN goes HIGH after a rising or falling edge of Ax or Bx, the device remains in STANDBY state until the next edge comes. All state transitions can be level triggered. The output is determined by the following truth table (Table 1). Table 1. Truth Table Four-Level Combinational Operation HIGH (Ax) LOW (Ax) HIGH (Bx) OAx = VH1 OBx = VL1 OAx = VL1 OBx = VH1 LOW (Bx) OAx = VH2 OBx = VL2 OAx = VL2 OBx = VH2 _______________________________________________________________________________________ 7 MAX17079 Pin Description (continued) MAX17079 4-Level or 2-Level Logic to High-Voltage Level Shifter for TFT LCD TV Display 3.3V 10V 7V 0.1μF 6V 0.1μF 5V 0.1μF 15V 2V 0.1μF 0.1μF 0.1μF 0.1μF VCC VH1 VH2 VCOM VL2 VL1 VLS OA1 OB1 A1 OA2 B1 OB2 A2 B2 OA3 A3 OB3 B3 OA4 MAX17079 A4 OB4 B4 PANEL SYSTEM OA5 A5 B5 OB5 A6 OA6 B6 OB6 A7 OA7 B7 OB7 AGND EN DGND CH ST VCC Figure 1. Typical Operating Circuit 8 _______________________________________________________________________________________ 4-Level or 2-Level Logic to High-Voltage Level Shifter for TFT LCD TV Display EN VH1 VH2 VCOM VL2 VL1 MAX17079 VCC VLS LOGIC A1 OA1 LEVEL SHIFTER B1 OB1 A2 OA2 LEVEL SHIFTER B2 OB2 A3 OA3 LEVEL SHIFTER B3 OB3 A4 OA4 LEVEL SHIFTER B4 OB4 A5 OA5 LEVEL SHIFTER B5 OB5 A6 OA6 LEVEL SHIFTER B6 OB6 A7 OA7 LEVEL SHIFTER OB7 B7 ST AGND CH DGND Figure 2. Functional Diagram _______________________________________________________________________________________ 9 MAX17079 4-Level or 2-Level Logic to High-Voltage Level Shifter for TFT LCD TV Display Sequential Operation Two-Level Operation Connect CH to AGND and ST to VCC for four-level sequential operation. If EN is LOW or VCC is less than its UVLO or VVLS is less than its UVLO, the outputs are in STANDBY and the outputs connect to VCOM. After EN is HIGH, VCC exceeds its UVLO and VLS exceeds its UVLO, the outputs are ready to respond to logic inputs at Ax and Bx. In sequential operation, the logic inputs and corresponding output states sequence only in a predefined order. In four-level operation, it is only possible to progress from STATE 1 to STATE 2 or to STANDBY. The same applies to the other transitions, including from STATE 4 to STATE 1. Table 2 shows the logic states of the level shifter in a sequential mode of operation. Figure 3 shows the sequence of operation. Outputs OAx and OBx always change in the same sequence. The MAX17079 also has a two-level output voltage operation. Connect CH to VCC for two-level operation. In two-level operation, the device transitions between two states and the outputs can be connected only to VH2 or VL2 or VCOM in STANDBY. Other than the startup condition, there is no way to distinguish between sequential operation and combinational operation. If EN is LOW or VCC is less than its UVLO or VLS is less than its UVLO, the outputs are in STANDBY and the outputs connect to VCOM. After EN is HIGH, VCC is greater than its UVLO and VLS is greater than its UVLO, the outputs are ready to respond to logic inputs at Ax. Connect Bx to AGND, as the outputs respond only to the rising and falling edge of Ax. The outputs transition from VCOM to the specific output only on the rising edge of Ax in sequential mode. In combinational mode, the outputs transition from VCOM to the specific output on either rising or falling edge of Ax. The following truth table (Table 3) shows the output states. Table 2. Truth Table Four-Level Sequential Mode of Operation STATE Ax Bx OAx OBx STATE 1 H H VH1 VL1 STATE 2 H L VH2 VL2 STATE 3 L H VL1 VH1 STATE 4 L L VL2 VH2 x = Don’t care. Table 3. Truth Table Two-Level Operation HIGH (Ax) OAx = VH2, OBx = VL2 LOW (Ax) OAx = VL2, OBx = VH2 EN Ax Bx OAx OBx Figure 3. Sequential Mode Operation 10 ______________________________________________________________________________________ 4-Level or 2-Level Logic to High-Voltage Level Shifter for TFT LCD TV Display 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 VOLTAGE Careful PCB layout is important for proper operation. Use the following guidelines for good PCB layout: VLS VH1 VH2 VCOM VL2 VCC VL1 EN TIME Figure 4. Startup Sequence • 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 capacitor 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 connecting AGND and DGND. Chip Information TRANSISTOR COUNT: 7580 PROCESS: BiCMOS ______________________________________________________________________________________ 11 MAX17079 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. Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) QFN THIN.EPS MAX17079 4-Level or 2-Level Logic to High-Voltage Level Shifter for TFT LCD TV Display 12 ______________________________________________________________________________________ 4-Level or 2-Level Logic to High-Voltage Level Shifter for TFT LCD TV Display Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 13 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc. MAX17079 Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.)