Description Features Available RoHS Pb-Free and Pb-Free Solder Products High Efficiency Synchronous Buck Topology Low Noise Fixed Frequency Operation Wide Input Voltage Range: 4.5V–13.8V
High Continuous Output Current: 20A
Programmable output voltage range: 0.59V–5.1V
Overcurrent and output overvoltage protection with auto-restart Remote differential output voltage detection Power good signal enable input Start-up to pre-biased load No minimum load requirement
High MTBF of 64 million hours Industry standard size through-hole single in-line package and pins  1.45" x 0.34" (36.8mm x 8.6mm)
Low Height 0.61" (15.5mm)
Wide operating temperature range: 0 to 70 degrees Celsius
The UL94 V-0 flammability rating recommends the use of power point load converters with regulated bus converters in an intermediate bus architecture (IBA). The YEV09T20-0 non-isolated DC-DC point-of-load (POL) converter provides up to 20A of output current in an industry-standard single-pipe (SIP) through-hole package. The YEV09T20-0pol converter is ideal for intermediate bus architectures that require load transition points.
A POL converter operating from a 4.5-13.8V input provides an extremely tight programmable output voltage of 0.59V to 5.1V. POL converters provide excellent thermal performance even in high temperature environments with minimal airflow. This performance is achieved through the use of advanced circuit solutions, packaging and processing techniques. The resulting design features ultra-high efficiency, excellent thermal management, and a slim body profile that minimizes resistance to system airflow for enhanced cooling of upstream and downstream equipment. The use of assembly automation, coupled with advanced power electronics and thermal design, results in an extremely high level of reliability.

Application Information Input Output Impedance
The POL converter should be connected to the DC power supply with low impedance. In many applications, the inductance associated with the distribution from the power supply to the converter input can affect converter stability. Internally, the converter includes 30µF (low ESR ceramic) input capacitors, eliminating the need for external input capacitors. However, if the input voltage distribution of the POL converter contains high inductance, it is recommended to add 47-100µF decoupling capacitors near the converter input pins. Low ESR tantalum or POS capacitors are connected to the input pins to help ensure the stability of the POL converter and reduce input ripple voltage.
The converter is designed for stable operation with or without external capacitors. A 22µF ceramic output capacitor is recommended to improve output ripple and dynamic response.
To maintain good load regulation, it is important to maintain low resistance and low inductance of the printed circuit board when connecting the load to the output pins of the converter.
Output voltage programming

The output voltage can be programmed from 0.59V to 5.1V by connecting an external resistor RTRIM between the trim pin (pin 2) and the sense pin (pin 8)

On/Off (pin 5)
The ON/OFF pin is used to remotely turn the power converter on or off via a system signal. The internal impedance of the ON/OFF pin to ground is typically 4.32kΩ. The on/off signal is referenced to ground. The converter turns on or off when the ON/OFF pin is at a logic high (1V min) or when the ON/OFF pin is at a logic low (0.4V max) or connected to GND. This model has an internal pull-up resistor 30.1kΩ from the ON/OFF pin to the VIN.

Remote control (pins 7 and 8)

The remote sensing function compensates for the voltage drop between the output pins of the POL converter and the load. The SENSOR (Pin 8) and SENSOR+ (Pin 7) pins should be connected at the load or where adjustment is required.
If remote sensing is not required, the sense pins must be connected directly to the VOUT and GND pins at the output of the POL converter.

The telemetry circuit configuration does not require large traces on the end user board due to the minimal current carried by the sense wires. The voltage sense trace should be close to the ground plane to minimize system noise.
When using remote sensing, the output voltage of the converter can be increased by 0.2V to maintain the voltage required by the load. However, the maximum output voltage measured directly between the VOUT and GND pins should not exceed 5.0V. Furthermore, it is the user's responsibility to ensure that the actual output power of the POL converter is always at or below the maximum allowable output power obtained from the derating curve.
Power OK (pin 4)
The power good pin (pin 4) is an open drain output. The power good pin is high when the output voltage is within regulation. The power good pin is at logic low during startup, undervoltage, overvoltage, or overcurrent conditions, or when the POL converter is disabled by an on/off signal.
Input Undervoltage Lockout When the input voltage falls below a predetermined voltage, the POL converter will shut down. It will automatically start when the input voltage exceeds the specified threshold.
Output Over Current Protection The POL converter has over current and short circuit protection. When an overcurrent condition is sensed, the POL converter will enter hiccup mode of operation. Once the overload or short-circuit condition is removed, the POL converter will automatically restart and Vout will return to its nominal value.
Output Overvoltage Protection The output of the POL converter is overvoltage protected. If the output voltage is higher than 115% of the rated value set by RTRIM, the high-side MOSFET will turn off immediately and the low-side MOSFET will turn on. The POL converter will remain in this state until the output voltage falls below 115% of its nominal value. At this point, the POL converter will automatically restart.
Ripple and Noise

Test Set Safety for Measuring Input Reflected Ripple Current and Output Voltage Ripple
The YEV09T20-0pol converter does not provide isolation from input to output. According to all IEC60950-based standards, the input device powering the YEV09T20-0 must provide relevant isolation requirements. However, if the system using the converter requires approval from a safety agency, there are certain rules that must be followed by the system design. In particular, all creepage and clearance requirements in end-use safety requirements must be followed. These requirements are contained in UL60950-CSA6095000 and EN60950, although specific applications may have other or additional requirements.
The YEV09T20-0pol converter has no internal fuse. If required, an external fuse is required to prevent catastrophic failure of the converter. For proper selection of input fuses, see the "Input Fuse Selection for DC/DC Converters" application note on . The input trace and chassis ground trace (if applicable) must be capable of conducting 1.5 times the value of the fuse without disconnection. To comply with safety agency requirements, an approved fuse must be used in series with the input wire. Fuse must not be placed in the ground position pin assignment and description input lines. The POL input is protected with a fast acting 25A fuse for abnormality and component failure testing. Additional testing may be required if a fuse with a current rating greater than 25A is used.
Under any operating conditions, the maximum DC voltage between the two pins is VIN. According to all IEC60950 based standards, in order to treat the output of the YEV09T20-0pol converter as SELV (Safety Extra Low Voltage), the input of the POL also needs to be provided by an isolated secondary power supply that provides SELV.

Recommended Footprint - Top View Notes:
1. Nuclear and Medical Applications - Power One products may not be designed, used or authorized for use as critical components of life support systems, equipment used in hazardous environments, or nuclear control systems without the express written consent of the Power One, Inc. divisional presidents.
2. Technical Modifications - The appearance of the product, including safety agency certifications on the label, may change based on the date of manufacture. Specifications are subject to change without notice
[1] The output voltage measured directly between the Vout and GND pins must not exceed 5.1V