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AP65211 Datasheet

TSOT26 LIGHT LOAD IMPROVED 2A SYNCH DC-DC BUCK CONVERTER

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AP65211
TSOT26 LIGHT LOAD IMPROVED 2A SYNCH DC-DC BUCK CONVERTER
Description
The AP65211 is a 500kHz switching frequency internal compensated
synchronous DC-DC buck converter. It has integrated low RDS(ON)
high and low side MOSFETs.
The AP65211 enables continuous load current of up to 2A with
efficiency as high as 97%.
The AP65211 implements an automatic custom light load efficiency
improvement algorithm.
The AP65211 features current mode control operation, which enables
fast transient response times and easy loop stabilization.
The AP65211 simplifies board layout and reduces space
requirements with its high level of integration and minimal need for
external components, making it ideal for distributed power
architectures.
The AP65211 is available in a standard Green TSOT26 package and
is RoHS compliant.
Pin Assignments
Top View
GND 1
SW 2
IN 3
TSOT26
6 BST
5 EN
4 FB
Features
VIN 4 to 16V
2A Continuous Output Current
Efficiency Up to 97%
Automated Light Load improvement
VOUT Adjustable from 0.8V
500kHz Switching Frequency
Internal Soft-Start
Enable Pin
Overvoltage Protection & Undervoltage Protection
Overcurrent 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/quality/lead_free.html 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
INPUT
VIN
12V
C1
22μF
36
IN BST
2
ON 5
SW
OFF EN AP65211
4
FB
1
GND
C5
1µF L1
4.7μH
R3
75kΩ
R1
40.2kΩ
R2
13kΩ
OUTPUT
VOUT
3.3V
C2
22μF
Figure 1 Typical Application Circuit
AP65211
Document number: DS39118 Rev. 1 - 2
1 of 14
www.diodes.com
October 2016
© Diodes Incorporated


Diodes Semiconductor Electronic Components Datasheet

AP65211 Datasheet

TSOT26 LIGHT LOAD IMPROVED 2A SYNCH DC-DC BUCK CONVERTER

No Preview Available !

AP65211
Pin Descriptions
Pin Name
GND
SW
IN
FB
EN
BST
Pin Number
1
2
3
4
5
6
Function
Ground
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 BS to power the high-side switch.
Power Input. IN supplies the power to the IC, as well as the step-down converter switches. Drive IN with a 4.7V
to 16V power source. Bypass IN to GND with a suitably large capacitor to eliminate noise on the input to the IC.
See Input Capacitor.
Feedback Input. FB senses the output voltage and regulates it. Drive FB with a resistive voltage divider
connected to it from the output voltage. The feedback threshold is 0.8V. 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.
High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-Channel MOSFET a 0.01µF or
greater capacitor from SW to BS to power the high side switch.
Functional Block Diagram
5
Internal
0.4V
EN
Reference
0.8V
1.1V
Vcc
Regulator
1.1V
4
FB
0.4V
0.8V
Internal SS
+
OVP
-
SE = 0.9V/T
+ UVP Oscillator
+
- 500KHz
1pF
RT = 0.22V/A
62pF
-
+
+
Error
Amplifier
650k
Ref OCP
+
-
PWM
Comparator
Logic
3
IN
6
BST
2
SW
1
GND
AP65211
Document number: DS39118 Rev. 1 - 2
2 of 14
www.diodes.com
October 2016
© Diodes Incorporated


Part Number AP65211
Description TSOT26 LIGHT LOAD IMPROVED 2A SYNCH DC-DC BUCK CONVERTER
Maker Diodes
Total Page 14 Pages
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