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DC/DC Converter. AP5726 Datasheet

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DC/DC Converter. AP5726 Datasheet






AP5726 Converter. Datasheet pdf. Equivalent




AP5726 Converter. Datasheet pdf. Equivalent





Part

AP5726

Description

Step-up DC/DC Converter



Feature


www.DataSheet4U.com AP5726 WHITE LED ST EP-UP CONVERTER Features • • • • • • • • Inherently Match ed LED Current High Efficiency: 84% Typ ical Fast 1.2MHz Switching Frequency Cu rrent limit and UVLO Protections Intern al Thermal Shutdown Internal Over Volta ge Protection Integrated Soft-start Fun ction SOT26 and DFN2020C-6: Available i n “Green” Molding Compound (No Br, S.
Manufacture

Diodes

Datasheet
Download AP5726 Datasheet


Diodes AP5726

AP5726; b) Lead Free Finish/RoHS Compliant (Note 1) General Description The AP5726 is a step-up DC/DC converter specifically designed to drive white LEDs with a con stant current. The device can drive 2~6 LEDs in series from a Li-Ion cell. Ser ies connection of the LEDs provides ide ntical LED currents resulting in unifor m brightness and eliminates the need fo r ballast resistor.


Diodes AP5726

s. The AP5726 switches at 1.2MHz that al lows the use of tiny external component s. A low 0.31V feedback voltage minimiz es power loss in the current setting re sistor for better efficiency. Applicat ions • • • • • Cellular Phone s PDAs, Hand help Computers Digital Cam eras MP3 Players GPS Receivers Typical Application Circuit L1 22uH C IN 1uF V IN ON OFF PWM Dimming SW 2~.


Diodes AP5726

6 LEDs D1 COUT 1uF VIN AP5726 OVP EN FB GND RSET 15 Figure 1. Typical Appli cation Circuit AP5726 Rev. 1 1 of 16 www.diodes.com JUNE 2009 © Diodes In corporated www.DataSheet4U.com AP5726 WHITE LED STEP-UP CONVERTER Ordering Information AP 5726 XXX G - 7 Package W : SOT26 FDC : DFN2020C-6 Device AP5726 WG-7 AP5726FDCG-7 Notes: Green G : Gre en Packing 7 : Tap.

Part

AP5726

Description

Step-up DC/DC Converter



Feature


www.DataSheet4U.com AP5726 WHITE LED ST EP-UP CONVERTER Features • • • • • • • • Inherently Match ed LED Current High Efficiency: 84% Typ ical Fast 1.2MHz Switching Frequency Cu rrent limit and UVLO Protections Intern al Thermal Shutdown Internal Over Volta ge Protection Integrated Soft-start Fun ction SOT26 and DFN2020C-6: Available i n “Green” Molding Compound (No Br, S.
Manufacture

Diodes

Datasheet
Download AP5726 Datasheet




 AP5726
www.DataSheet4U.com
Features
Inherently Matched LED Current
High Efficiency: 84% Typical
Fast 1.2MHz Switching Frequency
Current limit and UVLO Protections
Internal Thermal Shutdown
Internal Over Voltage Protection
Integrated Soft-start Function
SOT26 and DFN2020C-6: Available in “Green”
Molding Compound (No Br, Sb)
Lead Free Finish/RoHS Compliant (Note 1)
AP5726
WHITE LED STEP-UP CONVERTER
General Description
The AP5726 is a step-up DC/DC converter specifically designed
to drive white LEDs with a constant current. The device can drive
2~6 LEDs in series from a Li-Ion cell. Series connection of the
LEDs provides identical LED currents resulting in uniform
brightness and eliminates the need for ballast resistors. The
AP5726 switches at 1.2MHz that allows the use of tiny external
components. A low 0.31V feedback voltage minimizes power loss
in the current setting resistor for better efficiency.
Applications
Cellular Phones
PDAs, Hand help Computers
Digital Cameras
MP3 Players
GPS Receivers
Typical Application Circuit
VIN
ON OFF
PWM Dimming
L1
22uH
D1
C IN
1uF
VIN SW
AP5726 OVP
EN FB
GND
COUT
1uF
2~6 LEDs
RSET
15
Figure 1. Typical Application Circuit
AP5726 Rev. 1
1 of 16
www.diodes.com
JUNE 2009
© Diodes Incorporated




 AP5726
www.DataSheet4U.com
Ordering Information
AP5726
WHITE LED STEP-UP CONVERTER
AP 5726 XXX G - 7
Package
W : SOT26
FDC : DFN2020C-6
Green
G : Green
Packing
7 : Tape & Reel
Device
AP5726WG-7
AP5726FDCG-7
Package
Code
W
FDC
Packaging
(Note 2)
SOT26
DFN2020C-6
13” Tape and Reel
Quantity
Part Number Suffix
3000/Tape & Reel
-7
3000/Tape & Reel
-7
Notes:
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
2. 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.
Pin Assignments
(1) SOT26
( Top View )
SW 1
6 VIN
GND 2
FB 3
5 OVP
74 EN
(2) DFN2020C-6
( Top View )
SW 1
VIN 2
OVP 3
6 GND
5 FB
4 EN
Pin Descriptions
Pin Name
SW
GND
FB
EN
OVP
VIN
Description
Switch Pin. Connect inductor/diode here. Minimize trace area at this pin to reduce EMI.
GND pin.
Feedback Pin. Reference voltage is 0.31V. Connect cathode of lowest LED and resister here.
Calculate resistor value according to the formula: RSET = 0.31V / ILED
Converter On/Off Control Input. A high input at EN turn 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.
Output Voltage detect pin for over voltage protection.
Input Supply Pin. Must be locally bypassed with 1μF or 2.2μF to reduce input noise.
AP5726 Rev. 1
2 of 16
www.diodes.com
JUNE 2009
© Diodes Incorporated




 AP5726
www.DataSheet4U.com
Block Diagram
AP5726
WHITE LED STEP-UP CONVERTER
FB 3
VIN 6
A1
-+
VREF
0.31V
EN 4
Enable
OVP
5
Comparator
A2
CONTROL
Rc LOGIC
OTP
Cc
Σ
RAMP
Generator
1.2MHz
Oscillator
1 SW
Driver
Q1
2 GND
Absolute Maximum Ratings
Symbol
Parameter
Rating
Unit
VIN VIN Pin Voltage
VSW SW Voltage
-0.3~7
-0.3~34
V
V
VOVP
VFB
EN
TJ(MAX)
TLEAD
TST
OVP Pin Voltage
Feedback Pin Voltage
EN
Maximum Junction Temperature
Lead Temperature
Storage Temperature Range
-0.3~35
-0.3~7
-0.3~7
150
300
-65 to +150
V
V
V
oC
oC
oC
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.
AP5726 Rev. 1
3 of 16
www.diodes.com
JUNE 2009
© Diodes Incorporated



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