AP5727

AP5727
BIAS POWER SUPPLY FOR OLED
SUB DISPLAY AND TFT-LED
NEW PRODUCT
Description
Pin Assignments
The AP5727 is a high efficiency boost converter in a
compact SOT25 that provides the bias voltages for OLED
Sub Display and TFT-LCD (Liquid Crystal Display).
A high 1.2MHz switching frequency and internal
compensation minimizes external part count, PCB area and
cost. Integrated soft start reduces inrush current.
The AP5727 has a 1.25V feedback voltage making it
compatible with industry standard boost converters used to
bias LCD panels.
( Top View )
SW
1
GND
2
FB
3
5
74
VIN
EN
SOT25
Features
Applications
•
•
•
•
•
•
•
•
•
30V High Output Voltage
Fast 1.2MHz Switching Frequency
Current limit and UVLO Protections
Internal Thermal Shutdown
Maximum 1µA Shutdown Current
Integrated Soft-start Function
SOT25: Available in “Green” Molding Compound
(No Br, Sb)
Lead Free Finish/RoHS Compliant (Note 1)
Notes:
•
•
Small size TFT-LCD Bias power supply.
OLED bias supply for a clamshell handset sub display
RF amplifier bias voltages
1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html.
Typical Application Circuit
D1
L1
VIN
VOUT
22uH
C IN
4.7uF
V IN
SW
R1
COUT
10uF
AP5727
FB
EN
GND
R2
Figure 1. Typical Application Circuit
AP5727
Document number: DS31887 Rev. 2 - 2
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AP5727
BIAS POWER SUPPLY FOR OLED
SUB DISPLAY AND TFT-LED
Functional Block Diagram
1 SW
Comparator
-
Driver
A2
R
Q
Q1
+
S
RC
-
A1
+
CC
V REF
1.25V
Σ
-
VIN 5
+
NEW PRODUCT
FB 3
RAMP
Generator
EN 4
2 GND
Shutdown
1.2MHz
Oscillator
Figure 2. Block Diagram
Pin Descriptions
Name
SW
GND
FB
EN
VIN
Description
Switch Pin. Connect inductor/diode here. Minimize trace area at this pin to reduce EMI.
GND pin
Feedback Pin. Reference voltage is 1.25V.
Regulator On/Off Control Input. A high input at EN turns on the converter, and a low input turns it off. When not
used, connect EN to the input source for automatic startup. The EN pin cannot be left floating.
Input Supply Pin. Must be locally decoupled - 4.7μF recommended to reduce input noise.
AP5727
Document number: DS31887 Rev. 2 - 2
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AP5727
BIAS POWER SUPPLY FOR OLED
SUB DISPLAY AND TFT-LED
Absolute Maximum Ratings (TA = 25°C)
NEW PRODUCT
Symbol
VIN
VSW
VFB
EN
TJ(MAX)
TLEAD
TST
Parameter
VIN Pin Voltage
SW Voltage
Feedback Pin Voltage
EN
Maximum Junction Temperature
Lead Temperature
Storage Temperature Range
Rating
-0.3~7
-0.3~32
-0.3~7
-0.3~7
150
300
-65 to +150
Unit
V
V
V
V
°C
°C
°C
Caution: The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be
exceeded under any condition.
Recommended Operating Conditions
Symbol
VIN
TJ
TA
Parameter
Input Voltage
Operating Junction Temperature
Operating Ambient Temperature
Min
2.7
-40
-40
Max
5.5
125
85
Unit
V
°C
°C
Electrical Characteristics (VIN = 3.6V, TA = 25°C, unless otherwise specified)
Symbol
Parameter
System Supply Input
VIN
Operating Input Voltage
UVLO Under Voltage Lockout
Under Voltage Lockout Hysteretic
IQ
Quiescent Current
ISD
Shutdown Current
Oscillator
FOSC
Operation Frequency
Dmax Maximum Duty Cycle
Reference Voltage
VFB
Feedback Voltage
IFB
FB Pin Bias Current
MOSFET
RDS(on) On Resistance of MOSFET
IOCP
Switching Current Limit
Control and Protection
EN
Voltage High
EN
Voltage Low
IEN
EN Pin Pull Low Current
Thermal Resistance Junction-toθJA
Ambient
Thermal Resistance Junction-toθJC
Case
Notes:
Conditions
FB=1.3V, No Switching
VEN < 0.4V
Normal Operation
ON
OFF
Min.
Typ.
Max.
Unit
2.7
-
2.2
85
500
0.1
5.5
2.4
1
V
V
mV
μA
μA
1
86
1.2
90
1.4
-
MHz
%
1.225
10
1.25
45
1.275
100
V
nA
-
0.95
750
1.2
-
Ω
mA
1.5
-
4
0.4
6
V
V
μA
SOT25 (Note 2)
162
o
C/W
SOT25 (Note 2)
36
o
C/W
2. Test condition for SOT25: Device mounted on FR-4 substrate, single-layer PC board, 2oz copper, with minimum recommended pad layout
AP5727
Document number: DS31887 Rev. 2 - 2
3 of 10
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January 2011
© Diodes Incorporated
AP5727
BIAS POWER SUPPLY FOR OLED
SUB DISPLAY AND TFT-LED
Typical Performance Characteristics (VIN 3.3V; VOUT = 15V IOUT = 20mA)
VIN vs. Shutdown Current
VIN vs. Quiescent Current
Quiescent Current(uA)
Shutdown Current(uA)
800
0.08
0.06
0.04
0.02
700
600
500
400
300
200
100
0
0
2.5
3
3.5
4
VIN (V)
4.5
5
5.5
2.5
3
3.5
4
VIN (V)
4.5
5
5.5
5
5.5
VIN vs. Max Duty
1.4
100
1.3
95
Max Duty (%)
Frequency(MHZ)
VIN vs. Frequency
1.2
1.1
90
85
1
80
2.5
3
3.5
4
VIN (V)
4.5
5
5.5
2.5
3
3.5
VIN vs. Feedback Voltage
4
VIN (V)
4.5
IOUT vs. Feedback Voltage
1.27
1.27
1.26
1.26
Feedback Voltage(V)
Feedback Voltage(V)
NEW PRODUCT
0.1
1.25
1.24
1.23
1.25
1.24
1.23
1.22
1.22
2.5
3
3.5
AP5727
Document number: DS31887 Rev. 2 - 2
4
VIN (V)
4.5
5
5.5
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0
10
20
30
IOUT (mA)
40
50
January 2011
© Diodes Incorporated
AP5727
BIAS POWER SUPPLY FOR OLED
SUB DISPLAY AND TFT-LED
Typical Performance Characteristics (VIN 3.3V; VOUT = 15V IOUT = 20mA)
Temperature vs. Frequency
Temperature vs. Shutdown Current
1.7
Frequency (MHZ)
Shutdown Current(uA)
1.6
1.2
0.8
0.4
0
1.4
1.1
0.8
0.5
-50
-25
0
25
50
75
Temperature (℃)
100
125
-50
-25
0
25
50
75
100
125
Temperature (℃)
IOUT (mA) vs. Efficiency (%)
Temperature vs. Feedback Voltage
1.3
90
VIN = 5V
85
1.28
Efficiency(%)
Feedback Voltage(mV)
NEW PRODUCT
2
1.26
1.24
VIN = 4.2V
80
VIN = 3.6V
75
VIN = 3.3V
70
65
60
1.22
55
50
1.2
-50
-25
0
25
50
75
Temperature (℃)
AP5727
Document number: DS31887 Rev. 2 - 2
100
125
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0
20
40
60
80
IOUT (mA)
January 2011
© Diodes Incorporated
AP5727
BIAS POWER SUPPLY FOR OLED
SUB DISPLAY AND TFT-LED
Typical Performance Characteristics (Continued)
VOUT Ripple
VIN = 3.3V; VOUT = 15V ; IOUT = 50mA
VOUT Ripple
VIN = 3.3V; VOUT = 15V ; IOUT = 5mA
NEW PRODUCT
SW
SW
N
VOUT
VOUT
POWER OFF
VIN = 3.3V; VOUT = 15V ; IOUT = 50mA
POWER ON
VIN = 3.3V; VOUT = 15V ; IOUT = 50mA
AP5727
Document number: DS31887 Rev. 2 - 2
VEN
VEN
VOUT
VOUT
IL
IL
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AP5727
BIAS POWER SUPPLY FOR OLED
SUB DISPLAY AND TFT-LED
Typical Performance Characteristics (Continued)
Load Transient Response
VIN = 3.3V; VOUT = 15V ; IOUT = 5~50mA
NEW PRODUCT
VOUT
IOUT
Application Information
Inductor Selection
A 10μH~22μH inductor is recommended for most AP5727 applications. Although small size and high efficiency are major
concerns, the inductor should have low core loss at 1.2MHz and low DCR.
Capacitor Selection
Ceramic capacitors, due to their small size, are ideal for AP5727 applications. X5R and X7R types are recommended
because they retain their capacitance over wider voltage and temperature ranges than other types such as X5R and X7R.
A 4.7μF input capacitor and a 10μF output capacitor are sufficient for most AP5727 applications.
Diode Selection
Schottky diodes, with their low forward voltage drop and fast reverse recovery, are the ideal choices for AP5727 applications.
The forward voltage drop of a Schottky diode represents the conduction loss in the diode, while the diode capacitance (CT)
represents the switching loss. For diode selection, both forward voltage drop and diode capacitance need to be considered.
Schottky diodes with higher current ratings usually have lower forward voltage drop and larger diode capacitance, which can
cause significant switching loss at the 1.2MHz switching frequency of the AP5727.
AP5727
Document number: DS31887 Rev. 2 - 2
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AP5727
BIAS POWER SUPPLY FOR OLED
SUB DISPLAY AND TFT-LED
Application Circuit
VOUT
VIN
D1
L1
1
22uH
B0540WS
Cout
10uF
Cin
4.7uF
U1
R1
11K
1
2
NEW PRODUCT
2
R2
1K
3
SW
Vin
5
GND
FB
EN
4
AP5727
Table 1. Suggested Inductors
Vendor
Wurth Electronics
GOTREND
TAIYO YUDEN
Inductors
(uH)
22
22
22
Current Rating
(A)
0.51A
0.56A
0.51A
Type
SMD
SMD
SMD
Dimensions
(mm)
3.8X 3.8 X 1.6
3.8 X 3.8 X 1.05
4.0 X 4.0 X 1.25
Series
744031220
GLP3810PH220N
NR4012
Table 2. Suggested Capacitors for CIN and COUT
Vendor
TAIYO YUDEN
TAIYO YUDEN
Capacitance
4.7uF
10uF
Type
SMD
SMD
Series
LMK316 B7 475KL-T
LMK316 F 106ZL-T
Type
SOD323
SOD323
SOD523
Series
ZLLS400
B0540WS
SDM20U40
Table 3. Suggested Diodes
Vendor
ZETEX
DIODES
DIODES
Rating
40V/0.5A
40V/0.5A
40V/0.25A
Table 4. Suggested Resistor
Vendor
YAGEO
Type
SMD
Series
FR-SK
Ordering Information
AP 5727 W G - 7
Package
Green
G : Green
W : SOT25
Device
Package Code
Packaging
(Note 3)
AP5727WG-7
W
SOT25
Note:
Packing
7 : Tape & Reel
7” Tape and Reel
Quantity
Part Number Suffix
3000/Tape & Reel
-7
3. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf.
AP5727
Document number: DS31887 Rev. 2 - 2
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AP5727
BIAS POWER SUPPLY FOR OLED
SUB DISPLAY AND TFT-LED
Marking Information
(1) SOT25
( Top View )
4
7
5
XX Y W X
NEW PRODUCT
1
Part Number
AP5727
2
3
XX : Identification Code
Y : Year 0~9
W : Week : A~Z : 1~26 week;
a~z : 27~52 week; z represents
52 and 53 week
X : A~Z : Green
Package
SOT25
Identification Code
H8
Package Outline Dimensions (All Dimensions in mm)
(1) Package Type: SOT25
AP5727
Document number: DS31887 Rev. 2 - 2
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© Diodes Incorporated
AP5727
BIAS POWER SUPPLY FOR OLED
SUB DISPLAY AND TFT-LED
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DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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NEW PRODUCT
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A critical component is any component in a life support device or system whose failure to perform can be reasonably expected
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AP5727
Document number: DS31887 Rev. 2 - 2
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