Pololu Step-Down Voltage Regulator 9V 2.9A D30V30F9
Description
- Pololu Step-Down Voltage Regulator 9V 2.9A D30V30F9
- Highly efficient conversion
- Wide input range 9-45V
- Accurate 9V output
- Compact and reliable
- Advanced safety features
The Pololu Step-Down Voltage Regulator 9V 2.9A D30V30F9 is a synchronous buck voltage regulator that efficiently converts higher input voltages up to 45 V to a lower, fixed 9 V output. This type of regulator, known as a switching regulator or DC-to-DC converter, is significantly more efficient than linear voltage regulators, particularly when there is a substantial difference between the input and output voltages. The device is capable of supporting continuous output currents ranging from 2 A to 3.5 A, with the exact current depending on the input and output voltages.
The regulator boasts a high degree of accuracy, maintaining the output voltage within 4% of the nominal value. It operates with an efficiency between 80% and 95%, which varies based on the input voltage, output voltage, and load. The device features a very low dropout voltage and operates at a switching frequency of approximately 700 kHz under heavy loads. To enhance efficiency under light loads, it includes a power-save mode that reduces the switching frequency. Additionally, the regulator has a low quiescent current.
For added functionality, the regulator is equipped with an enable input that allows for precise disconnection of the load, transitioning the regulator into a low-power state with minimal current draw. A "power good" output is also provided to indicate the regulators inability to maintain the output voltage. The device employs frequency spread spectrum operation to minimize peak EMI noise and includes under-voltage lockout protection. A soft-start feature is incorporated to limit inrush current and ensure a gradual ramp-up of output voltage. The regulator is also designed with integrated reverse-voltage protection, over-current and short-circuit protection, and over-temperature shutoff for enhanced safety.
The compact dimensions of the regulator facilitate easy integration into a variety of applications. It includes six connections: power good, enable, input voltage, output voltage, and two ground connections. The "power good" indicator is an open-drain output that signals when the output voltage deviates significantly from the nominal value. To utilize this feature, an external pull-up resistor is required. The regulator is enabled by default but can be put into a low-power sleep state by adjusting the voltage on the enable pin. An external pull-down resistor can be added to set a low-voltage cutoff, forming a voltage divider with the on-board pull-up resistor.
The regulators input voltage range allows for a variety of voltages to be applied, with the effective lower limit being the output voltage plus the regulators dropout voltage. The dropout voltage is dependent on the load and is detailed in the provided graphs. The regulated output voltage is provided at the VOUT connection.
During normal operation, this product can get hot enough to burn you. Take care when handling this product or other components connected to it.
- 1x Pololu Step-Down Voltage Regulator 9V 2.9A D30V30F9
- 1x 6x1 Straight male header strip
- 1x 5x1 Right-angle male header strip
Included with the regulator is one pin of the straight header which can optionally be separated with a pair of flush cutters and soldered into PG.

- 0.7 x 0.8 x 0.355 inch / 17.8 x 20.3 x 9 mm (L x W x H)
- Minimum operating voltage: 9 V
- Maximum operating voltage: 45 V
- Continuous output current: 2.9 A
- Output voltage: 9 V
- Reverse voltage protection: Yes
- Maximum quiescent current: 13 mA
- Output type: fixed 9 V
- Typical efficiency of 80% to 95%
- Weight: 3.3 g
Estimate shipping
Refund Policy
If you are not satisfied with a product purchased from the Site, you may request a return within 30 days from the delivery date, unless the product is listed under the Return Exceptions below or is subject to specific return conditions noted on the product page.
This return policy also applies, as a minimum standard, to products sold and fulfilled by third-party vendors through the Marketplace.
Please review the Return Conditions, Return Exceptions and the process on How to Request a Return Authorisation (RA) before initiating a return request.
United Kingdom consumers exercising their statutory Right of Cancellation are subject to different conditions. See the Statutory Right of Cancellation.
Returns under this policy concern non-defective products. In the case of a confirmed manufacturing defect, remedies are handled under the Warranty terms, at the Vendor's discretion. See the Warranty section.
Return Conditions
To qualify for a refund under the 30-day return policy, all of the following conditions must be met:
- A valid Return Authorisation (RA) number must be obtained prior to returning the product. Returns without an RA number will be refused.
- The RA number is valid for 30 days. The returned item must be received within that period.
- The RA number must be included with the return.
- Products must be returned in unused, unmodified condition (e.g., no scratches, alterations, missing parts, or signs of installation/use) and in their original packaging, suitable for resale.
- Shipping fees are non-refundable. Return shipping costs are the responsibility of the customer, except in cases of a product confirmed defective through RobotShop's troubleshooting process or of a verified shipping error by RobotShop.
- Refunds are processed within 7 days after receipt and inspection of the returned item.
- A £100 cleaning fee may apply to domestic robots returned in used or unclean condition.
- A 20% restocking fee may apply to large-quantity returns of items ordered specifically for the customer from the manufacturer or not part of RobotShop's standard inventory.
Return Exceptions
The following products are not eligible for return or refund under this policy:
- Used, damaged, or modified products — Items that show signs of use, wear, or alteration, making them unsuitable for resale.
- Consumables * — Use and wear-and-tear components, altered or depleted through use (e.g., batteries, belts, brushes, gears, filament, tyres, disposable bags, lubricants, greases, waxes, etc.). Not eligible for return once opened or used.
- Perishables — Goods liable to deteriorate or expire rapidly. Not eligible for return.
- Sealed goods (health or hygiene) — Items sealed for health-protection or hygiene reasons (e.g., masks, gloves, odour-absorbing products). Not eligible for return once unsealed.
- Build-it-yourself products and items requiring customer assembly * — Including robots & kits, robot parts, and other products requiring assembly or soldering. Not eligible for return once assembled, soldered, or installed.
- Digital Goods, Software, and Apps * — Final sale only, due to licensing restrictions.
- Clearance Items * — Products identified as clearance or final sale, including end-of-life or discontinued items.
- Custom-made, personalized, or special-order items — Products manufactured, configured, adapted, or built to the customer's own specifications and requirements.
- On-Demand Items * — Standard catalogue products not stocked by RobotShop and ordered specifically to fulfil a customer request.
- Professional & Specialized Equipment — See the Professional & Specialized Equipment Warranty page and Professional & Institutional Buyers (B2B) section in the Terms & Conditions.
* United-Kingdom consumers retain their statutory Right of Cancellation on these items. Its exercise is subject to the conditions and exclusions set out in the Statutory Right of Cancellation, and any reimbursement may be reduced to reflect a loss in value resulting from handling beyond inspection.
How to Request a Return Authorisation (RA)
While the same return policy applies, these orders require a separate contact process for returns.
- RobotShop Fulfilled Orders → submit a support ticket from your account under My Support Tickets.
- Marketplace Vendor Orders → submit a ticket from your account under My Marketplace Tickets to contact the vendor directly.
Note: Marketplace vendor products are normally labelled with SKUs starting with RM, and identified on the product page with the mention "Sold and fulfilled by [Vendor Name]".