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TM
EV0074 (MP1530)
Triple Output TFT Bias Converter
EVALUATION BOARD
The Future of Analog IC Technology
TM
DESCRIPTION
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.
FEATURES
* * * 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 250m Internal Power MOSFET Switch Up to 95% Efficiency 1A 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 TFT LCD Displays Portable DVD Players Tablet PCs Car Navigation Displays
ELECTRICAL SPECIFICATIONS
Parameter Input Voltage Output Voltage 1 Output Current 1 Output Voltage 2 Output Current 2 Output Voltage 3 Output Current 3 Symbol VIN VMAIN IMAIN VGH IGH VGL IGL Value 2.7 - 5.5 +13 350 +27 20 -8.5 20 Units V V mA V mA V mA
* * * * * * * * * * * * * * * *
APPLICATIONS
"MPS" and "The Future of Analog IC Technology" are Trademarks of Monolithic Power Systems, Inc.
EV0074 EVALUATION BOARD
Efficiency vs Load Current
100 90
EFFICIENCY (%)
Step-Up Converter Only VMAIN = 13V VIN=5.0V VIN=3.3V
80 70 60 50 40 30 20 10
Dimensions (2.4"X x 2.2"Y x 0.5"Z) Board Number EV0074
EV0074 (MP1530) Rev. 1.2 8/23/2005
MPS IC Number MP1530
10 100 LOAD CURRENT (mA)
1000
MP1530-EC02
www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved.
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TM
EV0074 (MP1530) - TRIPLE OUTPUT TFT BIAS CONVERTER EVALUATION BOARD
EVALUATION BOARD SCHEMATIC
VIN 3.3V/5V
C2 10nF
CT EN RDY COMP IN SW
C14 NS D1 1N5819 VMAIN 13V C15 NS
OFF ON RDY SW C21 NS C20 D5 BAS40-04-7 NS VGL -8.5V C19 NS
FB1
C3 10nF
IN2
D3 BAS40-04-7
D2 NS
GL FB2
MP1530
IN3
D4 BAS40-04-7
GH
C17 330pF
REF GND
VGH 27V
FB3 PGND
C18 330pF
MP1530_S01
EV0074 BILL OF MATERIALS
Qty 1 2 Ref C1 C2, C3 C4, C5, C7, C9, C10, C11, C12, C16 C6 C8 C13 C14, C15, C19, C20, C21 C17, C18 Value 10F 10nF Description Ceramic Capacitor, 6.3V, X5R Ceramic Capacitor, 50V, X7R Package 1210 0805 Manufacturer P/N Distributor P/N Panasonic: ECJ-4YB1A106K Panasonic: ECJ-2VB1H103K Panasonic: ECJ-2YB1H104K Panasonic: ECJ-3YB1E105K Panasonic: ECJ-4YB1E106M TDK: C3225X7R1H105K Digikey: PCC2170CT-ND Digikey: PCC103BNCT-ND Digikey: PCC1840CT-ND Digikey: PCC1893CT-ND Digikey: PCC2243CT-ND Digikey: 445-1430-1-ND
8
0.1F
Ceramic Capacitor, 50V, X7R
0805
1 1 1 5 2
1F 10F 1F NS 330pF
Ceramic Capacitor, 25V, X7R Ceramic Capacitor, 25V, X5R Ceramic Capacitor, 50V, X7R Not Stuffed Ceramic Capacitor, 50V, NPO
1206 1210 1210
0805
Panasonic: ECJ-2VC1H331J
Digikey: PCC471CGCT-ND
EV0074 (MP1530) Rev. 1.2 8/23/2005
www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved.
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TM
EV0074 (MP1530) - TRIPLE OUTPUT TFT BIAS CONVERTER EVALUATION BOARD
EV0074 BILL OF MATERIALS (continued)
Qty 1 1 3 1 2 1 1 3 1 1 2 1 Ref D1 D2 D3, D4, D5 L1 R1, R2 R3 R4 R5, R7, R9 R6 R8 R10, R11 U1 4.7H NS Value Description Schottky Diode, 40V, 1A Not Stuffed Schottky Diodes, Dual, 40V, 200mA 2.26A, SMD, Unshielded 0805 0805 0805 0805 0805 0805 0805 QFN16 (3x3) SOT23 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 MPS: MP1530DQ Digikey: BAS40-04DICT-ND Package SOD-123 Manufacturer P/N Distributor P/N Diodes Inc: 1N5819HW-7 Digikey: 1N5819HWDICT-ND
100k Resistor, 5% 6.8k Resistor, 5%
68.1k Resistor, 1% 10k Resistor, 5%
93.1k Resistor, 1% 205k Resistor, 1% 0 Resistor, 5% MP1530
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
EV0074 (MP1530) Rev. 1.2 8/23/2005
www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved.
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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. (c) 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 15s. 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 10k to 50k 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. (c) 2005 All Rights Reserved.
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