9V, 2.6A Step-Down Voltage Regulator D36V28F9

₪115

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9V, 2.6A Step-Down Voltage Regulator D36V28F9

This small synchronous switching step-down (or buck) regulator takes an input voltage of up to 50V and efficiently reduces it to 9V. The board measures only 0.7″×0.8″ yet delivers typical maximum continuous output currents between 2.3A and 3.4A, depending on the input voltage, which makes it well suited for powering moderate loads like sensors or small motors. An optional enable input can be used to put the regulator in a low-power state with a current draw of 10µA to 20µA per volt on VIN. The regulator also features reverse voltage protection and a power-good output that indicates when the regulator cannot adequately maintain the output voltage. The pins have a 0.1″ spacing, making this board compatible with standard solderless breadboards and perfboards.

The D36V28Fx family of buck (step-down) voltage regulators generates lower output voltages from input voltages as high as 50V. They are switching regulators (also called switched-mode power supplies (SMPS) or DC-to-DC converters), which makes them much more efficient than linear voltage regulators, especially when the difference between the input and output voltage is large. These regulators can typically support continuous output currents between 2A and 4A, depending on the input voltage and output voltage (see the Maximum continuous output current section below). In general, the available output current is a little higher for the lower-voltage versions than it is for the higher-voltage versions, and it decreases as the input voltage increases.

This family includes six versions with fixed output voltages ranging from 3.3V to 12V:

The regulators have reverse voltage protection up to 40V, output undervoltage and overvoltage protection, over-current protection, and short-circuit protection. A thermal shutdown feature also helps prevent damage from overheating and a soft-start feature limits the inrush current and gradually ramps the output voltage on startup.

Features:

Input voltage: 9.8V to 50V (minimum input subject to dropout voltage considerations; see the dropout voltage section for details)
Output voltage: 9V with 4% accuracy
Typical maximum continuous output current: 2.3A to 3.4A (see the maximum continuous output current graph below)
Typical efficiency of 85% to 95%, depending on input voltage, output voltage, and load (see the efficiency graph below)
Switching frequency: ~500kHz under heavy loads
Power-save mode with ultrasonic operation that increases light load efficiency by reducing switching frequency, but keeps it above the audible range (20kHz)
1mA to 3mA typical no-load quiescent current (see the quiescent current graph below)
Enable input for disconnecting the load and putting the regulator into a low-power state that draws approximately 10µA to 20µA per volt on VIN
“Power good” output indicates when the regulator cannot adequately maintain the output voltage
Output undervoltage and overvoltage protection
Soft-start feature limits inrush current and gradually ramps output voltage
Integrated reverse-voltage protection up to 40V, over-current and short-circuit protection, over-temperature shutoff
Compact size: 0.7″×0.8″×0.345″ (17.8mm × 20.3mm × 8.8mm)
Two 0.086″ mounting holes for #2 or M2 screws

Connections:

This regulator has six connections: power good (PG), enable (EN), input voltage (VIN), output voltage (VOUT), and two ground (GND) connections.

The “power good” indicator, PG, is an open-drain output that goes low when the regulator’s output voltage either rises more than 20% above or falls more than 10% below the nominal voltage (with hysteresis). An external pull-up resistor is required to use this pin.

The EN pin is pulled-up to reverse-protected VIN by a 100kΩ resistor, which enables the regulator’s output by default. The EN pin can be driven low (under 0.4V) to put the board into a low-power state. The quiescent current draw in this sleep mode is dominated by the current in the pull-up resistor from EN to VIN and by the reverse-voltage protection circuit, which altogether will draw between 10µA and 20µA per volt on VIN when EN is held low. If you do not need this feature, you can leave the EN pin disconnected.

The input voltage, VIN, powers the regulator. Voltages up to 50V can be applied to VIN. Generally, the effective lower limit of VIN is VOUT plus the regulator’s dropout voltage, which varies approximately linearly with the load (see below for graphs of the dropout voltage as a function of the load).

VOUT is the regulated output voltage.

The six connections are arranged on 0.1″ grid for compatibility with solderless breadboards, connectors, and other prototyping arrangements that use a 0.1″ grid. The PG connection is the only one not located along the edge of the board. A 6×1 straight male header strip and a 5×1 right-angle male header strip are is included with the regulator; one pin of the straight header can optionally be broken off and soldered into PG.

Dimensions

Size:	0.7″ × 0.8″ × 0.345″¹
Weight:	3.3 g¹

General specifications

Minimum operating voltage:	9.8 V²
Maximum operating voltage:	50 V
Continuous output current:	2.6 A³
Output voltage:	9 V
Reverse voltage protection?:	Y⁴
Maximum quiescent current:	3 mA⁵
Output type:	fixed 9V

Identifying markings

PCB dev codes:	reg24a
Other PCB markings:	0J11946

Notes:

1: Without included optional headers.
2: Subject to dropout voltage considerations. See the dropout voltage graph under the description tab for more information.
3: Typical continuous output current at 36V in. Actual achievable continuous output current is a function of input voltage and is limited by thermal dissipation. See the output current graph under the description tab for more information.
4: To -40V. Connecting supplies over 40V in reverse can damage the device.
5: While enabled with no load. Can be reduced to under 1mA using the enable pin.