BUCK CONVERTER. AP65251 Datasheet

AP65251 CONVERTER. Datasheet pdf. Equivalent

AP65251 Datasheet
Recommendation AP65251 Datasheet
Part AP65251
Description 500KHz ACOT SYNCHRONOUS DC/DC BUCK CONVERTER
Feature AP65251; ADVANCED INFORMATION AP65251 2A, 16V, 500KHz ACOT SYNCHRONOUS DC/DC BUCK CONVERTER Description The.
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Datasheet
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Diodes AP65251
AP65251
2A, 16V, 500KHz ACOT SYNCHRONOUS DC/DC BUCK CONVERTER
Description
The AP65251 is an adaptive constant on-time mode synchronous
buck converter providing high efficiency, excellent transient response
and high DC output accuracy for low-voltage regulation in digital
TVs, set-top-boxes, and network systems.
Pin Assignments
Top View
The constant-on-time control scheme handles wide input/output
voltage ratios and provides low external component count. The
internal proprietary circuit enables the device to adopt ultra-low ESR
ceramic capacitors.
The adaptive on-time control supports seamless transition between
continuous conduction mode (CCM) at higher load conditions and
discontinuous conduction mode (DCM) at lighter load conditions.
DCM allows AP65251 to maintain high efficiency at light load
conditions. The AP65251 also features UVLO, OTP, and OCP to
protect the circuit.
BST 1
GND 2
FB 3
TSOT26
6 SW
5 VIN
4 EN
This IC is available in TSOT26 package.
Features
VIN 4.5V to 16V
2A Continuous Output Current, 2.5A Valley
Efficiency Up to 95%
Automated Light Load improvement
VOUT Adjustable to 0.6 to 6V
500kHz Switching Frequency
Internal Soft-Start
Enable Pin
Over current Protection (OCP) with Hiccup
Thermal Protection
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Applications
Gaming Consoles
Flat Screen TV sets and Monitors
Set Top Boxes
Distributed power systems
Home Audio
Consumer electronics
Network Systems
FPGA, DSP and ASIC Supplies
Green Electronics
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Typical Applications Circuit
INTPUT
C1
10μF
51
IN BST
6
4 SW
EN AP65251
3
FB
2
GND
C5
100nF
L1
2.2μH
Cff
R1
10kΩ
R2
10kΩ
OUTPUT
VOUT
1.2V
C2
22μF
Figure 1. Typical Application Circuit
AP65251
Document number: DS36109 Rev. 1 - 2
1 of 19
www.diodes.com
Figure 2. Load Transient 0 to 2A
October 2017
© Diodes Incorporated



Diodes AP65251
AP65251
Pin Descriptions
Pin
Name
BST
GND
FB
EN
VIN
SW
Pin Number
TSOT26
1
2
3
4
5
6
Function
High-Side Gate Drive Boost Input. BST supplies the drive for the high-side N-Channel MOSFET a 0.01µF or
greater capacitor from SW to BST to power the high side switch.
Power Ground.
Feedback sensing terminal for the output voltage. Connect this pin to the resistive divider of the output. See
Setting the Output Voltage.
Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to turn on the regulator; low to
turn it off. Attach to IN with a 100kΩ pull up resistor for automatic startup.
Power Input. VIN supplies the power to the IC, as well as the step-down converter switches. Drive VIN with a
4.5V to 16V power source. Bypass VIN to GND with a suitably large capacitor to eliminate noise on the input to
the IC. See Input Capacitor.
Power Switching Output. SW is the switching node that supplies power to the output. Connect the output LC
filter from SW to the output load. Note that a capacitor is required from SW to BST to power the high-side
switch.
Functional Block Diagram
4
EN
Se +
0.6V
Internal
Reference
+
3
-FB
SS +
Min Off
SW Time
S
R
On Time
Compute
VIN
5V Vcc
Regulator
Soft Start
SS
Q
OCP SW
Ref
Logic
UVLO Control
5
VIN
5V
1
BST
Q
One Shot
Digital Control
Logic
6
SW
Frequency
Lock Loop
2
GND
Figure 2. Functional Block Diagram
AP65251
Document number: DS36109 Rev. 1 - 2
2 of 19
www.diodes.com
October 2017
© Diodes Incorporated



Diodes AP65251
AP65251
Absolute Maximum Ratings (Note 4) (@TA = +25°C, unless otherwise specified.)
Symbol
VIN
VSW
VBST
VFB
VEN
TST
TJ
TL
ESD Susceptibility (Note 5)
HBM
CDM
Parameter
Supply Voltage
Switch Node Voltage
Bootstrap Voltage
Feedback Voltage
Enable/UVLO Voltage
Storage Temperature
Junction Temperature
Lead Temperature
Human Body Mode
Charge Device Model
Rating
-0.3 to 20
-1.0 to VIN +0.3
VSW -0.3 to VSW +6.0
-0.3V to +6.0
-0.3V to +16.0
-65 to +150
+160
+260
2000
1000
Unit
V
V
V
V
V
°C
°C
°C
V
V
Notes:
4. Stresses greater than the 'Absolute Maximum Ratings' specified above may cause permanent damage to the device. These are stress ratings only;
functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may
be affected by exposure to absolute maximum rating conditions for extended periods of time.
5. Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when
handling and transporting these devices.
Thermal Resistance (Note 6)
Note:
Symbol
Parameter
Rating
Unit
θJA
Junction to Ambient
TSOT26
122
°C/W
θJC
Junction to Case
TSOT26
28
°C/W
6. Test condition for SOT26: Device mounted on FR-4 substrate, single-layer PC board, 2oz copper, with minimum recommended pad layout
Recommended Operating Conditions (Note 7) (@TA = +25°C, unless otherwise specified.)
Note:
Symbol
Parameter
Min
VIN Supply Voltage
TA Operating Ambient Temperature Range
4.5
-40
7. The device function is not guaranteed outside of the recommended operating conditions.
Max
16
+85
Unit
V
°C
AP65251
Document number: DS36109 Rev. 1 - 2
3 of 19
www.diodes.com
October 2017
© Diodes Incorporated





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