AP62200TWU-EVM 18V 2A Low Iq COT Synchronous DC-DC Buck Converter
Product Information:
Product Name: AP62200TWU-EVM
Type: Synchronous DC-DC Buck Converter
Input Voltage Range: 4.2V to 18V
Output Current: 2A
Control Method: Constant On-Time (COT)
Package: TSOT26
Features: – High-efficiency step-down DC-DC conversion – Fast
transient response – Easy loop stabilization – Low output voltage
ripple – EMI reduction – Undervoltage Lockout (UVLO) –
Cycle-by-Cycle Valley Current Limit – Thermal Shutdown
Applications: – Flat Screen TV Sets and Monitors – Set Top Boxes –
Consumer Electronics – Network Systems – General Purpose Point of
Load Product Usage Instructions:
1. Setting Output Voltage: – Refer to Table 1 for component
selections for common output voltages. – Choose the appropriate
resistors R1 and R2 based on the desired output voltage. – Choose
the inductor L1 based on the recommended values. 2. Evaluation
Board Setup: – Connect a power supply to the input terminals VIN
and GND. Set VIN to 12V. – Connect the positive terminal of the
electronic load to VOUT and the negative terminal to GND. – For
Enable, place a jumper at JH8 to the ON position to connect the EN
pin to VIN through a 100K resistor to enable the IC. Leave it OPEN
to disable the IC. Note: Refer to the user manual for more detailed
instructions, safety precautions, and additional information about
the product.
AP62200TWU-EVM
18V, 2A, Low Iq, COT Synchronous DC-DC Buck Converter
DESCRIPTION
The AP62200T is a 2A, synchronous buck
converter with a wide input voltage range of
4.2V to 18V. The device fully integrates a
90m high-side power MOSFET and a
65m low-side power MOSFET to provide
high-efficiency
step-down
DC-DC
conversion.
The AP62200T device is easily used by minimizing the external component count due to its adoption of Constant On-Time (COT) control to achieve fast transient response, easy loop stabilization, and low output voltage ripple.
The AP62200T design is optimized for Electromagnetic Interference (EMI) reduction. The device has a proprietary gate driver scheme to resist switching node ringing without sacrificing MOSFET turn-on and turn-off times, which reduces highfrequency radiated EMI noise caused by MOSFET switching.
AP62200T is available in a TSOT26 package.
FEATURES
VIN Range: 4.2V -18V Output Voltage range: 0.8V to 7V 2A Continuous Output Current 0.7625V ± 1% Reference Voltage
(TA = +25°C) => AP62200T 135µA Low Quiescent Current 740kHz Switching Frequency Proprietary Gate Driver Design for
Best EMI Reduction Protection Circuitry
o Undervoltage Lockout (UVLO)
o Cycle-by-Cycle Valley Current Limit
o Thermal Shutdown
Totally Lead-Free & Fully RoHS Compliant
Halogen and Antimony Free. “Green” Device
APPLICATIONS
Flat Screen TV Sets and Monitors Set Top Boxes Consumer Electronics Network Systems General Purpose Point of Load
AP62200TWU-EVM
Rev. 2
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AP62200TWU-EVM
18V, 2A, Low Iq, COT Synchronous DC-DC Buck Converter
TYPICAL APPLICATIONS CIRCUIT
Figure 1. Typical Application Circuit
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
VIN
Supply Pin Voltage
VSW
Switch Pin Voltage
VBST VEN VFB TST TJ TL ESD Susceptibility HBM CDM
Bootstrap Pin Voltage Enable/UVLO Pin Voltage
Feedback Pin Voltage Storage Temperature Junction Temperature
Lead Temperature
Human Body Mode Charge Device Model
Rating
Unit
-0.3 to +20.0 (DC) -0.3 to 22.0 (400ms)
V
-1.0 to VIN + 0.3 (DC) -2.5 to VIN + 2.0 (20ns)
V
VSW – 0.3 to VSW + 6.0
V
-0.3 to +6.0
V
-0.3 to +6.0
V
-65 to +150
°C
+150
°C
+260
°C
2000
V
500
V
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Rating
Unit
VIN VOUT TA
Supply Voltage
4.2 to 18
V
Output Voltage Range
0.8 to 7
V
Operating Ambient Temperature
-40 to +85
°C
TJ
Operating Junction Temperature
-40 to +125
°C
AP62200TWU-EVM
Rev. 2
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AP62200TWU-EVM
18V, 2A, Low Iq, COT Synchronous DC-DC Buck Converter
SETTING OUTPUT VOLTAGE:
Table 1 for AP62200T shows a list of recommended component selections for common output voltages.
VOUT
R1
R2
L1
1.0V
3.09K
10K
1.5µH
1.2V
5.76K
10K
2.2µH
1.5V 1.8V
9.76K 13.7K
10K 10K
2.2µH 3.3µH
2.5V
22.6K
10K
3.3µH
3.3V
33.2K
10K
3.3µH
5.0V
56.2K
10K
4.7µH
Table 1. Common Output Voltages (AP62200T)
EVALUATION BOARD
AP62200TWU-EVM
Rev. 2
Figure 2. AP62200TWU-EVM
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AP62200TWU-EVM
18V, 2A, Low Iq, COT Synchronous DC-DC Buck Converter
QUICK START GUIDE
The AP62200TWU-EVM has a simple layout and allows access to the appropriate signals through test points. To evaluate the performance of the AP62200TWU, follow the procedure below:
1. Connect a power supply to the input terminals VIN and GND. Set VIN to 12V.
2. Connect the positive terminal of the electronic load to VOUT and negative terminal to GND.
3. For Enable, place a jumper at JH8 to “ON” position to connect EN pin to VIN through 100K resistor to enable IC or leave it OPEN. Jump to “OFF” position to disable IC.
4. The evaluation board should now power up with a 5.0V output voltage.
5. Check for the proper output voltage of 5.0V (±1%) at the output terminals VOUT and GND. Measurement can also be done with a multimeter with the positive and negative leads between VOUT and GND.
6. Set the load to 2A through the electronic load. Check for the stable operation of the SW signal on the oscilloscope. Measure the switching frequency.
MEASUREMENT/PERFORMANCE GUIDELINES:
1) When measuring the output voltage ripple, maintain the shortest possible ground lengths on the oscilloscope probe. Long ground leads can erroneously inject high frequency noise into the measured ripple.
2) For efficiency measurements, connect an ammeter in series with the input supply to measure the input current. Connect an electronic load to the output for output current.
AP62200TWU-EVM
Rev. 2
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AP62200TWU-EVM
18V, 2A, Low Iq, COT Synchronous DC-DC Buck Converter EVALUATION BOARD SCHEMATIC
Figure 3. AP62200TWU-EVM Schematic PCB TOP LAYOUT
AP62200TWU-EVM
Rev. 2
Figure 4. AP62200TWU-EVM Top Layer
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PCB BOTTOM LAYOUT
AP62200TWU-EVM
18V, 2A, Low Iq, COT Synchronous DC-DC Buck Converter
Figure 5. AP62200TWU-EVM Bottom Layer
AP62200TWU-EVM
Rev. 2
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AP62200TWU-EVM
18V, 2A, Low Iq, COT Synchronous DC-DC Buck Converter
BILL OF MATERIALS for AP62200TWU-EVM for VOUT=5V
Ref
Value
C1
10µF
C2, C3 22µF
C4, C6 0.1µF
L1
4.7µH
R1
56.2K
R2
10K
R3
0
Description
Qty Size
Ceramic Capacitor, 25V, X5R Ceramic Capacitor, 25V, X5R Ceramic Capacitor, 50V, X7R, 10%
1 1210 2 1210 2 0603
Vendor Name
Manufacturer PN
Murata AVX Samsung
GRM32DR61E106KA12L 12103D226KAT2A GCJ188R71H104KA12D
DCR=19.5m, Ir=6.2A SMD Resistor, 1%
SMD Resistor, 1%
SMD Resistor, 1%
10.2X10. Wurth 1 2×4.5mm Electronics 744779747
1 0603
Panasonic ERJ-3EKF5622V
1 0603
Panasonic ERJ-3EKF1002V
1 0603
Panasonic ERJ-3GEY0R00V
R4 JH4, JH5, JH6, JH7
JH8
U1
100K
SMD Resistor, 1%
1598 AP62200T
Terminal Turret Triple 0.094″ L (Test Points) PCB Header, 40 POS Sync Buck DC/DC converter
1 0603
Panasonic ERJ-3EKF1003V
Through- Keystone
4 Hole
Circuit
1598-2
1 1X3
3M
2340-6111TG
1 TSOT26 Diodes Inc AP62200TWU-7
AP62200TWU-EVM
Rev. 2
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AP62200TWU-EVM
18V, 2A, Low Iq, COT Synchronous DC-DC Buck Converter
TYPICAL PERFORMANCE CHARACTERISTICS
VOUT_AC (20mV/div)
IL (1A/div)
VSW (10V/div) AP62200TWU-EVM
Rev. 2
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AP62200TWU-EVM
18V, 2A, Low Iq, COT Synchronous DC-DC Buck Converter
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