MPS EV0074 Triple output tft bias converter Datasheet

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)
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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
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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
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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
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