Diodes AP3445/L User Manual
AP3445/L
EVB User Guide
This EVB user guide contains new product information. Diodes, Inc. reserves the right to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sale of the product.
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AP3445/L EVB User Guide
AE Department
1. AP3445/L Revision Information
Date
Revision
Description
Comment
2017/10
V1.0
Initial Release
2. AP3445/L General Description
The AP3445/L is a 2A step-down DC-DC converter. At heavy load, the constant frequency PWM control
performs excellent stability and transient response. No external compensation components are required.
The AP3445/L supports a range of input voltages from 2.7V to 5.5V, allowing the use of a single Li+/Lipolymer cell, multiple Alkaline/NiMH cell, and other standard power sources. The output voltage is
adjustable from 0.6V to the input voltage. The AP3445/L employs internal power switch and synchronous
rectifier to minimize external part count and realize high efficiency. During shutdown, the input is
disconnected from the output and the shutdown current is less than 1μA. Other key features include
over-temperature and short circuit protection, and under-voltage lockout to prevent deep battery discharge.
The AP3445/L delivers 2A maximum output current while consuming only 55μA of no-load quiescent
current. Ultra-low RDS(ON) integrated MOSFETs and 100% duty cycle operation make the AP3445/L an
ideal choice for high output voltage, high current applications which require a low dropout threshold.
Pulse skip mode allows to maintain high efficiency at light-load conditions.
The AP3445/L is available in TSOT23-6 package.
AP3445/L
EVB User Guide
This EVB user guide contains new product information. Diodes, Inc. reserves the right to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sale of the product.
2 of 5
www.diodes.com
October 2018
© Diodes Incorporated
3. AP3445/L Key Features
Output Current: Up to 2A
Output Voltage: 0.6V to V
IN
Input Voltage: 2.7V to 5.5V
55µA (Typ) No Load Quiescent Current
Shutdown Current: <1µA
100% Duty Cycle Operation
1MHz Switching Frequency
Internal Soft Start
No External Compensation Required
Current Limit Protection
Short Circuit Protection
AP3445L: Latch Off Protection
AP3445: Hiccup Mode Protection
Over Voltage Protection
AP3445L: Latch Off Protection
AP3445: Non Latch Off Protection
Thermal Shutdown
4. AP3445/L EV Board Schematic
R1
R2
VIN
EN
LX
FB
L1 2.2uH
CIN
22uF
VIN=2.7V to 5.5V
GND
C
OUT
22uFx2
V
OUT
=1.8V
ON
AP3445/L
C1
22pF 200kΩ
100kΩ
PG
OFF
R3
100kΩ
5. AP3445/L EV Board Description
AP3445 EV board is suitable evaluation board for the AP3445, a DC/DC converter. The board is targeted
to be used in providing a simple and convenient evaluation environment for the AP3445. Requires parts,
power supply connectors etc. on the board, which makes it easy to be evaluated.
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