Analog Devices Inc. ADP1147AR-5-REEL7

Overview

ADP1147AR-5-REEL7 from Analog Devices is a high-efficiency step-down switching regulator controller designed to drive an external P-channel MOSFET in DC/DC conversion stages. It delivers a regulated 5 V output at up to 2 A load, operates from 3.5 V to 16 V input, features constant off-time current-mode control, and achieves >95% efficiency at 1 A with VIN = 6 V. It is used in portable computing power rails where low quiescent current and automatic power-saving mode are critical.

For engineers reviewing the ADP1147AR-5-REEL7 datasheet, ADP1147AR-5-REEL7 pinout, ADP1147AR-5-REEL7 application, or ADP1147AR-5-REEL7 equivalent, this page provides verified technical context, SOIC-8 package mapping, confirmed 8-pin terminal roles, real-world efficiency curves, and two validated alternative controllers for 5 V buck applications requiring external FET drive.

Technical Context

The ADP1147AR-5-REEL7 implements a constant off-time, current-mode architecture that sets switching frequency via external CT capacitor (e.g., 390 pF yields ~200 kHz at VIN = 10 V) and regulates output by comparing SENSE(–) voltage against an internal 1.25 V reference. Its dual-mode operation-continuous conduction above ~50% ripple current and automatic power-saving mode below-reduces ground current from 2.3 mA to 160 µA typical.

It uses dedicated SENSE(+) and SENSE(–) inputs to monitor differential voltage across an external sense resistor (RSENSE), enabling user-defined current limit (10–150 mV threshold range). The P-DRIVE output delivers rail-to-rail swing (VIN to GND) with <200 ns transition times into 3 nF load, supporting fast-switching P-MOSFETs like IRF7204.

Key Specifications

Pinout & Package

ADP1147AR-5-REEL7 is housed in an 8-lead SOIC (SO-8) package with standard JEDEC MS-012AC dimensions (4.9 mm × 6.0 mm × 1.75 mm), RoHS-compliant, and rated for –40°C to +85°C ambient operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down controller applications.

Compared with ADP1147AR-5-REEL7, ADP1148AR-5-REEL7 offers superior light-load efficiency and N-FET flexibility but demands more complex layout; LM2727MTC/NOPB provides predictable EMI profile but requires external components to match ADP1147AR-5-REEL7's integrated sleep functionality and ease of use.

Availability

ADP1147AR-5-REEL7 is available at Aetrix Electronics and suitable for portable computing power rails, cellular baseband supplies, GPS receiver front-ends, and handheld instrument ADC references requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADP1147AR-5-REEL7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and consumer markets since 1965.

The ADP1147AR-5-REEL7 belongs to Analog Devices' high-efficiency DC/DC controller product line, engineered specifically for battery-powered portable electronics demanding ultra-low quiescent current, wide input range, and seamless transition between continuous and power-saving modes.

FAQ

What is the output voltage tolerance of the ADP1147AR-5-REEL7 under full load?

The ADP1147AR-5-REEL7 delivers a nominal 5.05 V output with guaranteed tolerance of ±2% over 5–2000 mA load current at VIN = 9 V, as specified in the Electrical Characteristics table. Measured output remains within 4.90–5.20 V across temperature and line variations, ensuring compatibility with 5 V logic interfaces and USB peripherals.

Does the ADP1147AR-5-REEL7 support automatic power-saving mode, and how does it affect efficiency?

Yes, the ADP1147AR-5-REEL7 automatically enters power-saving mode when load current drops below ~50% of inductor ripple current, reducing ground current from 2.3 mA to 160 µA typical. This extends battery runtime in portable devices without sacrificing regulation - efficiency remains >85% down to 10 mA load, as shown in Figure 23.

What external components are required to implement a working 5 V/2 A converter using the ADP1147AR-5-REEL7?

A functional 5 V/2 A design requires: an external P-channel MOSFET (e.g., IRF7204), Schottky diode (e.g., 30BQ040), inductor (e.g., 50 µH molypermalloy core), input/output capacitors (CIN ≥ 100 µF, COUT ≥ 390 µF), sense resistor (RSENSE ≈ 25 mΩ), timing capacitor (CT = 390 pF), and error amp compensation capacitor (CC = 3300 pF). All values are validated in Figure 1 and Application section.

Can the ADP1147AR-5-REEL7 drive an N-channel MOSFET instead of a P-channel device?

No - the ADP1147AR-5-REEL7 is specifically designed to drive P-channel MOSFETs via its P-DRIVE output, which swings from VIN to GND. It lacks bootstrap circuitry or high-side gate driver capability required for N-FETs. For N-channel solutions, Analog Devices recommends the ADP1148AR-5-REEL7, which integrates bootstrap charging and N-FET gate drive.

What is the maximum recommended operating frequency for the ADP1147AR-5-REEL7, and how is it set?

The ADP1147AR-5-REEL7 supports up to 250 kHz switching frequency, set by the CT capacitor value and input voltage. With CT = 390 pF and VIN = 10 V, typical off-time is 5 µs, yielding ~200 kHz. Higher frequencies increase gate charge losses and reduce efficiency, as shown in Figure 6; 150–220 kHz is optimal for 5 V/2 A designs balancing size and thermal performance.