TM EV0055 (MP1530) Triple Output Step-Up Plus Charge Pump for TFT Bias The Future of Analog IC Technology TM EVALUATION BOARD DESCRIPTION FEATURES The EV0055 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. EV0055 EVALUATION BOARD Efficiency vs Load Current (Step-Up Converter Only) 100 VIN=5V EFFICIENCY (%) 90 80 VIN=3.3V 70 60 50 40 Dimensions (2.4”X x 2.3”Y x 0.4”Z) Board Number MPS IC Number EV0055 MP1530DQ EV0055 Rev. 1.3 8/22/2005 30 1 10 100 LOAD CURRENT (mA) www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 1000 MP1530_EC01 1 TM EV0055 (MP1530) TRIPLE OUTPUT STEP-UP PLUS CHARGE PUMP FOR TFT BIAS EVALUATION BOARD EVALUATION BOARD SCHEMATIC C4 0.1µF D5 BAS40-04-7 C10 0.1µF C11 0.1µF C20 NS D4 BAS40-04-7 C21 NS C12 0.1µF C9 0.1µF D3 BAS40-04-7 D2 NS VGH C5 0.1µF GND R11 C18 0Ω 330pF L1 4.7µF 2.3A 2 C2 10nF 3 SW CT EN MP1530 RDY R7 10kΩ FB2 5 6 7 C16 0.1µF VIN GND C14 NS C1 10µF 6.3V C19 NS FB3 FB1 IN 4 R6 93.1kΩ IN2 GL R2 100kΩ RDY 13 R3 6.8kΩ R8 205kΩ 12 VGL 11 10 9 R9 10kΩ C13 1µF 50V EN GND R4 68.1kΩ R10 C17 0Ω 330pF REF C8 10µF 25V 14 GND C15 NS 1 IN3 PGND D1 1N5819HW 15 COMP VMAIN GND 16 GH U1 8 R5 10kΩ C7 0.1µF C3 10nF R1 100kΩ C6 1µF 25V MP1530_S01 EV0055 Rev. 1.3 8/22/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 2 TM EV0055 (MP1530) TRIPLE OUTPUT STEP-UP PLUS CHARGE PUMP FOR TFT BIAS EVALUATION BOARD EV0055 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 1 D1 1 D2 3 D3, D4, D5 1 L1 2 R1, R2 1 Ceramic Capacitor, 50V, NPO Schottky Diode, 40V, 1A NS SOT23 2.26A, SMD, Unshielded R3 6.8kΩ Resistor, 5% 0805 1 R4 68.1kΩ Resistor, 1% 0805 3 R5, R7, R9 1 Resistor, 5% 0805 R6 93.1kΩ Resistor, 1% 0805 1 R8 205kΩ Resistor, 1% 0805 2 R10, R11 1 U1 EV0055 Rev. 1.3 8/22/2005 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 Diodes Inc: SOD-123 1N5819HW-7 0805 0Ω Panasonic: ECJ-4YB1A106K Panasonic: ECJ-2VB1H103K 0805 100kΩ Resistor, 5% 10kΩ Manufacturer P/N Distributor P/N Digikey: PCC471CGCT-ND Digikey: 1N5819HWDICT-ND Not Stuffed Schottky Diodes, Dual, 40V, 200mA 4.7µH Package Resistor, 5% MP1530 0805 QFN16 (3x3) 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 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 EV0055 (MP1530) TRIPLE OUTPUT STEP-UP PLUS CHARGE PUMP FOR TFT BIAS EVALUATION BOARD PRINTED CIRCUIT BOARD LAYOUT Figure 1—Top Silk Layer Figure 2—Top Layer Figure 3—Bottom Layer EV0055 Rev. 1.3 8/22/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 4 TM EV0055 (MP1530) TRIPLE OUTPUT STEP-UP PLUS CHARGE PUMP FOR TFT BIAS 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 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. EV0055 Rev. 1.3 8/22/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 5