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PDF EV0055 Data sheet ( Hoja de datos )
| Número de pieza | EV0055 | |
| Descripción | Triple Output Step-Up Plus Charge Pump | |
| Fabricantes | MPS | |
| Logotipo |  |
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www.DataSheet4U.com
TM
The Future of Analog IC Technology TM
DESCRIPTION
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
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
EV0055 (MP1530)
Triple Output Step-Up
Plus Charge Pump for TFT Bias
EVALUATION BOARD
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
• 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
Dimensions (2.4”X x 2.3”Y x 0.4”Z)
Board Number
EV0055
MPS IC Number
MP1530DQ
Efficiency vs
Load Current
(Step-Up Converter Only)
100
VIN=5V
90
80 VIN=3.3V
70
60
50
40
30
1
10 100 1000
LOAD CURRENT (mA)
MP1530_EC01
EV0055 Rev. 1.3
8/22/2005
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
1
1 page  
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
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| Páginas | Total 5 Páginas | |
| PDF Descargar | [ Datasheet EV0055.PDF ] | |
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