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AP65111 Datasheet

TSOT26 LIGHT LOAD IMPROVED 1.5A SYNCH DC-DC BUCK CONVERTER

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AP65111
TSOT26 LIGHT LOAD IMPROVED 1.5A SYNCH DC-DC BUCK CONVERTER
Description
The AP65111 is an internally compensated synchronous DC-DC buck
converter with a 500kHz switching frequency. It is integrated with high
and low-side MOSFETs with low RDS(ON).
The AP65111 enables continuous load current of up to 1.5A with
efficiency as high as 97%.
The AP65111 implements an automatic custom light-load efficiency
improvement algorithm.
The AP65111 features current mode control operation, which enables
fast transient response times and easy loop stabilization.
The AP65111 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 AP65111 is available in a standard Green TSOT26 package and
is RoHS compliant.
Pin Assignments
Top View
IN 1
GND 2
SW 3
TSOT26
6 FB
5 EN
4 BST
Features
Applications
VIN 4.5V to 16V
1.5A 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)
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
VIN=16V
VIN=12V
VIN=4.7V
INPUT
VIN
12V
C1
22μF
14
IN BST
2
ON 5
SW
OFF EN AP65111
6
FB
3
GND
C5
1µF L1
6.5μH
R3
59kΩ
R1
40.2kΩ
R2
13kΩ
OUTPUT
VOUT
3.3V
C2
22μF
AP65111
Document number: DS39153 Rev. 1 - 2
1 of 14
www.diodes.com
Figure 1 Typical Application Circuit
October 2016
© Diodes Incorporated


Diodes Semiconductor Electronic Components Datasheet

AP65111 Datasheet

TSOT26 LIGHT LOAD IMPROVED 1.5A SYNCH DC-DC BUCK CONVERTER

No Preview Available !

AP65111
Pin Descriptions
Pin
Name
IN
SW
GND
BST
EN
FB
Pin Number
TSOT26
1
2
3
4
5
6
Function
Power Input. IN supplies the power to the IC, as well as the step-down converter switches. Drive IN with a 4.5V 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 on Page 10.
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.
Ground
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.
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.
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 on Page 9.
Functional Block Diagram
5
EN
Internal
Reference
0.4V
0.8V
1.1V
Vcc
Regulator
+
1.1V -
OVP
6
FB
0.4V
0.8V
Internal SS
+ UVP
-
1pF
62pF
-
+
+
Error
Amplifier
SE=0.9V/T
Oscillator
+
500kHz
RT=0.22V/A
650k
OCP
Ref
+
-
PWM
Comparator
Logic
1
IN
4
BS T
2
SW
3
GND
AP65111
Document number: DS39153 Rev. 1 - 2
2 of 14
www.diodes.com
October 2016
© Diodes Incorporated


Part Number AP65111
Description TSOT26 LIGHT LOAD IMPROVED 1.5A SYNCH DC-DC BUCK CONVERTER
Maker Diodes
Total Page 14 Pages
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