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EV1531DQ-002A
Low Power, Triple Output Step-Up Plus Charge Pump for TFT Bias
Monolithic Power Systems
EVALUATION BOARD - INITIAL RELEASE
GENERAL DESCRIPTION
The EV1531DQ-002A Evaluation Board is designed to demonstrate the capabilities of MPS' MP1531 triple output step-up converter with charge-pumps. The MP1531 includes a 250KHz fixed-frequency step-up converter and a positive and negative linear regulator. The linear regulators are powered via charge-pumps driven by the step-up converter switch node. A single on/off control enables all 3 outputs. The outputs are internally sequenced at poweron for ease of use. An internal soft-start prevents overloading the input source at startup. Cycle-by-cycle current limit reduces component stress.
FEATURES
* * * 2.7V to 5.5V Operating Input Range 500mA Switch Current Limit 3 Outputs in Single Package * Step-Up Converter up to 22V * Positive 10mA Linear Regulator * Negative 10mA Linear Regulator 250m Internal Power MOSFET Switch Up to 95% Efficiency 1A Shutdown Mode Fixed 250KHz 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 SPECIFICATION
Parameter Symbol Value Units Input Voltage VIN 2.7-5.5 V Main Output Voltage VMAIN 5 V Main Output Current IMAIN 100 mA (+) Charge Pump Voltage VGH 15 V (+) Charge Pump Current IGH 5 mA (-) Charge Pump Voltage VGL -10 V (-) Charge Pump Current IGL 5 mA
* * * * * * * * * * * * * * * *
APPLICATIONS
, "MPS", "Monolithic Power Systems", and "The Future of Analog IC Technology" are Registered Trademarks of Monolithic Power Systems, Inc.
EV1531DQ-002A EVALUATION BOARD
Efficiency vs Load Current Delivered by Step-Up Converter
100 90 VIN = 4.2V VIN = 3.3V
EFFICIENCY (%)
80 70 60 50 40 30 20 0
Dimensions (2.34"X x 2.25"Y x 0.50"Z) Board Number EV1531DQ-002A 10/04, Rev. 1.1 MPS IC Number MP1531
VMAIN = 5V 100 200 300 400 500 600 LOAD CURRENT (mA)
MP1531-EC01
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EV1531DQ-002A - LOW PWR, TRI-OUTPUT STEP-UP + CHARGE PUMP FOR TFT BIAS EVALUATION BOARD - INITIAL RELEASE
EVALUATION BOARD SCHEMATIC
D3 BAS40-04-7 D8 BAS40-04-7 D9 BAS40-04-7
D4 BAS40-04-7 C26 NS C25 NS C21 NS JP1 D1 SW B0530W U1 C2 10nF
PGND IN3 SW CT GH IN2
D7 BAS40-04-7
D2 BAS40-04-7 D6 NS
C13 SW NS
VGH +15V GND VGL -10V
D5 NS
123
VMAIN +5V GND
GL EN
C11 56pF
MP1531
RDY FB3 FB2 IN GND REF
EN GND
RDY
FB1 COMP
VIN 2.7V-4.2V GND C4 NS C5 10nF
C9 56pF
EV1531_S01
EV1531DQ-002A BILL OF MATERIALS
Qty 6 1 2 5 12 Description Manufacturer P/N Schottky Diodes, Dual, Diodes Inc: BAS40-04-7 40V, 200mA, SOT-23 Schottky Diode, 30V, 0.5A, Diodes Inc: B0530W SOD-123 D5,D6 NS C4,C13,C21,C NS 25,C26 C12,C14,C15, Ceramic Capacitor, 0.33F, AVX: 08055C334KAT2A C16,C17,C18, 50V, 0805, X7R C19,C20, C22,C23,C24, C27 C3 Ceramic Capacitor, 10F, AVX:1210ZC106KAT2A 10V, 1210, X5R Ref D2, D3, D4,D7,D8,D9 D1 Distributor P/N Digikey BAS40-04DICT-ND Digikey: B0530WDICT-ND
Digikey: 478-1402-1-ND
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Digikey: 478-1625-1-ND
10/04, Rev. 1.1
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EV1531DQ-002A - LOW PWR, TRI-OUTPUT STEP-UP + CHARGE PUMP FOR TFT BIAS EVALUATION BOARD - INITIAL RELEASE
EV1531DQ-002A BILL OF MATERIALS (continued)
Qty 1 2 2 2 2 1 1 2 1 1 3 1 2 1 1 Ref C1 C8,C10 C2, C5 C6,C7 C9,C11 L1 U1 R1,R11 R4 R2 R3,R5,R8 R9 R6,R10 R7 JP1 Description Ceramic Capacitor, 22F, 10V, 1210, X5R Ceramic Capacitor, 1F, 25V, 1206, X7R Ceramic Capacitor, 10nF, 50V, 0805, X7R Ceramic Capacitor, 0.1F, 50V, 0805, X7R Ceramic Capacitor, 56pF, 50V, 0805, NPO Inductor, 33H, 740mA MP1531DQ, QFN16 Resistor, 100k, 0805, 5% Manufacturer P/N AVX:1210ZD226KAT2A AVX:12063C105KAT2A AVX:0805C103KAT2A AVX:08055C104KAT2A AVX:08055A560JAT2A Distributor P/N Digikey: 478-1632-1-ND Digikey: 478-1567-1-ND Digikey: 478-1383-1-ND Digikey: 478-1395-1-ND Digikey: 478-1313-1-ND
Coicraft:LP06013--333KX MPS: MP1531DQ Panasonic: ERJ-6GEYJ104V Digikey: P100KACT-ND Resistor, 5.6k, 0805, 5% Panasonic: ERJ-6ENF562V Digikey: P5.6KCCT-ND Resistor, 30.1k, 0805, 1% Panasonic: ERJ-6GEYJ303V Digikey: P30KACT-ND Resistor, 10k, 0805, 1% Panasonic: ERJ-6GEYJ103V Digikey: P10KACT-ND Resistor, 110k, 0805, 1% Panasonic: ERJ-6GEY114V Digikey: P110KACT-ND Resistor, 10, 0805, 5% Panasonic: ERJ-6GEYJ100V Digikey: P10ACT-ND Resistor, 80.6k, 0805, 1% Panasonic: ERJ-6ENF8062V Digikey: P80.6KCCT-ND Conn Jumper Sullins: STC02SYAN Digikey: S9000-ND
10/04, Rev. 1.1
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EV1531DQ-002A - LOW PWR, TRI-OUTPUT STEP-UP + CHARGE PUMP FOR TFT BIAS EVALUATION BOARD - INITIAL RELEASE
PRINTED CIRCUIT BOARD LAYOUT
Figure 1--Top Silk Layer
Figure 2--Top Layer
Figure 3--Bottom Layer
10/04, Rev. 1.1
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EV1531DQ-002A - LOW PWR, TRI-OUTPUT STEP-UP + CHARGE PUMP FOR TFT BIAS EVALUATION BOARD - INITIAL RELEASE
TEST RESULTS
Power-Up Sequencing Load Transient Efficiency vs Load Current Delivered by Step-Up Converter
100 90 VIN = 4.2V VIN = 3.3V
VMAIN 50mV/div VEN 5V/div VMAIN 5V/div VGH 10V/div VGL 10V/div
VIN = 3.3V, VMAIN = 5V, 5mA-50mA STEP VGH = 15V, IGH = 5mA, VGL = -10V, IGL = 5mA
VIN = 3.3V, VMAIN = 5V, IMAIN = 100mA, VGH = 15V, IGH = 5mA, VGL = -10V, IGL = 5mA, CCT=10nF
EFFICIENCY (%)
80 70 60 50 40 30 20 0
IMAIN 50mA/div
VMAIN = 5V 100 200 300 400 500 600 LOAD CURRENT (mA)
MP1531-TPC01
10ms/div
MP1531_WF01 MP1531_WF02
QUICK START GUIDE
The three output voltages of this board are set to +5V, +15V, and -10V. The board layout accommodates most commonly used inductors and output capacitors. 1. Make sure Jumper JP1 is connected between 2 and 3. 2. Attach positive end of loads to VMAIN, VGH,and VGL pins respectively. Attach negative end of loads to GND pins. 3. Attach input voltage 2.7V VIN 5.5V and input ground to VIN and GND pins respectively. 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 LOW after approximately 15s. If the fault persists for more than approximately 6ms (for CCT = 10nF), the entire chip will shut down.
NOTICE: MPS believes the information in this document to be accurate and reliable. However, it is subject to change without notice. Contact MPS for current specifications. MPS encourages users of its products to ensure that third party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS cannot assume any legal responsibility for any said applications. EV1531DQ-002A Rev. 1.1 Monolithic Power Systems, Inc. 10/13/04 983 University Avenue, Building A, Los Gatos, CA 95032 USA (c) 2004 MPS, Inc. Tel: 408-357-6600 Fax: 408-357-6601 www.MonolithicPower.com
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