TM EV0074 (MP1530) Triple Output TFT Bias Converter The Future of Analog IC Technology TM EVALUATION BOARD DESCRIPTION FEATURES The EV0074 evaluation board is designed to demonstrate the capabilities of MPS’ MP1530 triple output step-up converter which is capable of powering a TFT panel from a regulated 3.3V or 5V. • • • The MP1530 includes a 1.4MHz fixed-frequency step-up converter and a positive and negative linear regulator. The linear regulators are powered from a charge-pump driven by the step-up converter switch node (SW). A single on/off control enables all 3 outputs. The outputs are internally sequenced at power on and power off for ease of use. An internal soft-start prevents overloading the input source at startup. Cycle-by-cycle over current protection limits component overstress. ELECTRICAL SPECIFICATIONS Parameter Input Voltage Output Voltage 1 Output Current 1 Output Voltage 2 Output Current 2 Output Voltage 3 Output Current 3 Symbol Value Units VIN VMAIN IMAIN VGH IGH VGL IGL 2.7 – 5.5 +13 350 +27 20 –8.5 20 V V mA V mA V mA • • • • • • • • • • • • 2.7 to 5.5V Operating Input Range 2.8A Switch Current Limit 3 Outputs In Single Package • Step-Up Converter up to 22V • Positive 20mA Linear Regulator • Negative 20mA Linear Regulator 250mΩ Internal Power MOSFET Switch Up to 95% Efficiency 1µA Shutdown Mode Fixed 1.4MHz Frequency Positive Regulator up to 38V Negative Regulator down to –20V Internal Power-On Sequencing Adjustable Soft-Start/Fault Timer Thermal Shutdown Cycle-by-Cycle Over Current Protection Under Voltage Lockout Ready Flag APPLICATIONS • • • • TFT LCD Displays Portable DVD Players Tablet PCs Car Navigation Displays “MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic Power Systems, Inc. EV0074 EVALUATION BOARD Efficiency vs Load Current 100 Step-Up Converter Only VMAIN = 13V VIN=5.0V EFFICIENCY (%) 90 Dimensions (2.4”X x 2.2”Y x 0.5”Z) Board Number MPS IC Number EV0074 MP1530 EV0074 (MP1530) Rev. 1.2 8/23/2005 80 VIN=3.3V 70 60 50 40 30 20 10 10 100 LOAD CURRENT (mA) www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 1000 MP1530-EC02 1 TM EV0074 (MP1530) – TRIPLE OUTPUT TFT BIAS CONVERTER EVALUATION BOARD EVALUATION BOARD SCHEMATIC VIN 3.3V/5V C2 10nF C14 NS CT EN OFF ON RDY IN SW D1 1N5819 VMAIN 13V RDY COMP C19 NS SW C21 NS FB1 D3 BAS40-04-7 C3 10nF C15 NS IN2 C20 D5 BAS40-04-7 NS MP1530 D2 NS VGL -8.5V GL IN3 D4 BAS40-04-7 VGH 27V FB2 GH C17 330pF REF GND FB3 PGND C18 330pF MP1530_S01 EV0074 BILL OF MATERIALS Qty Ref Value Description 1 C1 10µF Ceramic Capacitor, 6.3V, X5R 1210 2 C2, C3 10nF Ceramic Capacitor, 50V, X7R 0805 8 C4, C5, C7, C9, C10, C11, C12, C16 0.1µF Ceramic Capacitor, 50V, X7R 0805 1 C6 1µF Ceramic Capacitor, 25V, X7R 1206 1 C8 10µF Ceramic Capacitor, 25V, X5R 1210 1 C13 1µF Ceramic Capacitor, 50V, X7R 1210 5 C14, C15, C19, C20, C21 NS Not Stuffed 2 C17, C18 330pF EV0074 (MP1530) Rev. 1.2 8/23/2005 Ceramic Capacitor, 50V, NPO Package 0805 Manufacturer P/N Distributor P/N Panasonic: ECJ-4YB1A106K Panasonic: ECJ-2VB1H103K Digikey: PCC2170CT-ND Digikey: PCC103BNCT-ND Panasonic: ECJ-2YB1H104K Digikey: PCC1840CT-ND Panasonic: ECJ-3YB1E105K Panasonic: ECJ-4YB1E106M TDK: C3225X7R1H105K Digikey: PCC1893CT-ND Digikey: PCC2243CT-ND Digikey: 445-1430-1-ND Panasonic: ECJ-2VC1H331J Digikey: PCC471CGCT-ND www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 2 TM EV0074 (MP1530) – TRIPLE OUTPUT TFT BIAS CONVERTER EVALUATION BOARD EV0074 BILL OF MATERIALS (continued) Qty Ref 1 D1 1 D2 3 D3, D4, D5 1 L1 2 R1, R2 1 Value Description Schottky Diode, 40V, 1A NS SOD-123 SOT23 2.26A, SMD, Unshielded 100kΩ Resistor, 5% 0805 R3 6.8kΩ Resistor, 5% 0805 1 R4 68.1kΩ Resistor, 1% 0805 3 R5, R7, R9 1 10kΩ Resistor, 5% 0805 R6 93.1kΩ Resistor, 1% 0805 1 R8 205kΩ Resistor, 1% 0805 2 R10, R11 1 U1 0Ω EV0074 (MP1530) Rev. 1.2 8/23/2005 Manufacturer P/N Distributor P/N Diodes Inc: 1N5819HW-7 Digikey: 1N5819HWDICT-ND Diodes Inc: BAS40-04-7 Toko: 817FY-4R7M=P3 Panasonic: ERJ-6GEYJ104V Panasonic: ERJ-6GEYJ682V Panasonic: ERJ-6ENF6812V Panasonic: ERJ-6GEYJ103V Panasonic: ERJ-6ENF9312V Panasonic: ERJ-6ENF2053V Panasonic: ERJ-6GEY0R00V Digikey: BAS40-04DICT-ND Not Stuffed Schottky Diodes, Dual, 40V, 200mA 4.7µH Package Resistor, 5% MP1530 0805 QFN16 (3x3) Digikey: P100KACT-ND Digikey: P6.8KACT-ND Digikey: P68.1KCCT-ND Digikey: P10KACT-ND Digikey: P93.1KCCT-ND Digikey: P205KCCT-ND Digikey: P0.0ACT-ND MPS: MP1530DQ www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 3 TM EV0074 (MP1530) – TRIPLE OUTPUT TFT BIAS CONVERTER EVALUATION BOARD PRINTED CIRCUIT BOARD LAYOUT Figure 1—Top Silk Layer Figure 2—Top Layer Figure 3—Bottom Layer EV0074 (MP1530) Rev. 1.2 8/23/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 4 TM EV0074 (MP1530) – TRIPLE OUTPUT TFT BIAS CONVERTER EVALUATION BOARD QUICK START GUIDE The three output voltages of this board are set to +13V, +27V, and –8.5V. The board layout accommodates most commonly used inductors and output capacitors. 1. Attach the positive end of loads to the VMAIN, VGH and GND (for the negative output) pins, respectively. Attach negative ends of the loads to GND and VGL (for the negative output) pins. 2. Attach an input voltage 2.7V ≤ VIN ≤ 5.5V and input ground to the VIN and GND pins, respectively. 3. The demo board starts up automatically once VIN is applied due to the pull-up resistor R1. To disable the MP1530 connect the EN pin to ground. 4. During startup RDY will be left HIGH. Once the turn-on sequence is complete, this pin will be pulled LOW if all regulators exceed 80% of their specified voltages. After all regulators are turned-on, a fault in any regulator will cause RDY to go HIGH after approximately 15µs. If the fault persists for more than approximately 6ms (for CT=10nF), the entire chip will shut down. 5. To adjust the output voltages: Use a 10kΩ to 50kΩ for the low-side resistor of each voltage divider (i.e. R7, R9 and R5). VFB1 = VFB3 = VREF = 1.25V. For the step-up converter, determine the high-side resistor R6 using the equation: R6 = VMAIN − VFB1 ⎛ VFB1 ⎞ ⎜⎜ ⎟⎟ ⎝ R7 ⎠ Where VMAIN is the output voltage of the step-up converter. For the positive charge-pump, determine the high-side resistor R8 by the equation: R8 = VGH − VFB3 ⎛ VFB3 ⎞ ⎜⎜ R9 ⎟⎟ ⎝ ⎠ Where VGH is the output voltage of the positive linear regulator. Determine the number of positive charge pump stages (NPOS) by: NPOS = VGH + VDROPOUT − VMAIN VMAIN − 2VD Use VDROPOUT = 1V and VD = 0.4V for Schottky diodes. For the negative charge-pump, determine the high-side resistor R4 by the equation: R4 = − VGL ⎛ VREF ⎜⎜ ⎝ R5 ⎞ ⎟⎟ ⎠ Where VGL is the output voltage of the negative linear regulator. Determine the number of negative charge pump stages (NNEG) by: NNEG = − VGL + VDROPOUT VMAIN − 2VD 6. Use VDROPOUT = 0.3V and VD = 0.4V for Schottky diodes. NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications. Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. EV0074 (MP1530) Rev. 1.2 8/23/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 All Rights Reserved. 5