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Analog Devices Inc. ADP1147AN-5
- Part No.:
- ADP1147AN-5
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ADP1147AN-5.pdf
- Description:
- STEP-DOWN SWITCHING REG
- Quantity:
- Payment:
- Shipping:
Inventory:3,466
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Product details
Overview
ADP1147AN-5 from Analog Devices is a high-efficiency step-down switching regulator controller designed to drive an external P-channel MOSFET in DC/DC conversion applications. 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 computers and GPS systems where compact, efficient power conversion is critical.
For engineers reviewing the ADP1147AN-5 datasheet, ADP1147AN-5 pinout, ADP1147AN-5 application, or ADP1147AN-5 equivalent, key selection considerations include its 5 V fixed output voltage, 8-pin PDIP package, 160 µA sleep-mode quiescent current, user-defined current limit via RSENSE, and compatibility with external P-MOSFETs such as IRF7204.
Technical Context
The ADP1147AN-5 implements a constant off-time, current-mode architecture that sets switching frequency via external CT capacitor (e.g., 390 pF yields ~250 kHz at VIN = 9 V) and regulates output by comparing SENSE(–) feedback against an internal 1.25 V reference. Its off-time controller discharges CT proportionally to VOUT, enabling wide input range operation and automatic transition between continuous and power-saving modes.
During light loads, comparator B detects reversed RSENSE polarity and activates power-saving mode; further reduction triggers sleep mode-disabling most circuitry to reduce IQ to 160 µA typical. Short-circuit protection is implemented by extending tOFF when sensed current exceeds 120–175 mV across RSENSE, limiting peak inductor current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.05 V (±100 mV load regulation over 5 mA–2 A) |
| Input Voltage Range | 3.5 V to 16 V - supports 5 V rail generation from single-cell Li-ion or multi-cell alkaline inputs |
| Efficiency | >95% at 1 A, VIN = 6 V - enables thermally constrained portable designs |
| Sleep Mode IQ | 160 µA typical at VIN = 10 V - extends battery life in standby states |
| Current Sense Threshold | 120–175 mV (adjustable via RSENSE) - sets peak inductor current for IMAX = 100 mV / RSENSE |
| Off-Time | 3.8–6 µs (CT = 390 pF, ILOAD = 700 mA) - determines minimum on-time and ripple current stability |
| Shutdown Threshold | 0.55–2.0 V on SHUTDOWN pin - allows clean enable/disable with standard logic-level signals |
Pinout & Package
ADP1147AN-5 is housed in an 8-lead plastic DIP (N-8) package with 0.3-inch width and through-hole mounting. Thermal resistance θJA = 110°C/W enables operation up to +70°C ambient without forced airflow.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Input supply connection | Accepts 3.5–16 V DC; must be decoupled with ≥100 µF low-ESR capacitor near pin |
| 2 CT | Timing capacitor node | Controls switching frequency; discharge current scales with VOUT to maintain stable off-time |
| 3 ITH | Error amplifier compensation | Decouples internal error amp; connects to RC network for loop stability tuning |
| 4 SENSE(–) | Inverting feedback input | Connects to internal resistive divider; senses regulated output voltage for closed-loop control |
| 5 SENSE(+) | Non-inverting current sense input | Paired with SENSE(–) to set current trip threshold across external RSENSE resistor |
| 6 SHUTDOWN | Enable/disable control | Pull ≥2.0 V to disable P-DRIVE; pull ≤0.55 V to enable normal operation |
| 7 GND | Signal ground reference | Must be routed separately to COUT negative and Schottky diode cathode to avoid noise coupling |
| 8 P-DRIVE | High-current gate driver output | Swings from VIN to GND; drives P-MOSFET gate with fast 100–200 ns transitions |
Key Features
| Feature | Design Value |
|---|---|
| Constant off-time current-mode control | Enables stable operation across wide VIN range without external compensation components |
| Automatic power-saving mode | Reduces switching losses below ~1 A load by entering burst-mode-like operation |
| Low dropout capability | Minimizes voltage headroom loss via low-RDS(ON) P-MOSFET support and minimal sensing voltage drop |
| User-defined current limit | Set precisely via RSENSE (20–200 mΩ), enabling tailored short-circuit and overload protection |
| Integrated shutdown function | Logic-compatible enable pin with <5 µA input current simplifies system-level power sequencing |
Applications
| Portable Computers | GPS Systems |
|---|---|
Use Scenario: Powering 5 V microcontrollers and RF front-ends in battery-powered navigation units. IC Role / Device Role / Timing Role: Step-down controller regulating main 5 V rail from 7–12 V Li-ion battery pack. Use Value: >95% efficiency at 1 A extends runtime; sleep-mode IQ of 160 µA preserves battery during satellite acquisition pauses. |
Use Scenario: Supplying 5 V to GNSS baseband processors and LNA bias circuits in handheld receivers. IC Role / Device Role / Timing Role: Primary DC/DC controller managing dynamic load transients during signal acquisition bursts. Use Value: Fast current-mode transient response minimizes VOUT droop during 100 mA–1.5 A load steps; CT-based frequency tuning avoids audible noise. |
| Cellular Telephones | Handheld Instruments |
Use Scenario: Generating 5 V for USB OTG peripherals and audio codecs in legacy 2G/3G feature phones. IC Role / Device Role / Timing Role: Secondary regulator supporting accessory interface power with low-noise operation. Use Value: Shutdown pin enables software-controlled power gating; 8-lead PDIP eases manual prototyping and repair. |
Use Scenario: Providing stable 5 V to precision ADCs, op-amps, and display drivers in field-deployed test meters. IC Role / Device Role / Timing Role: Main system regulator operating from 9 V alkaline or rechargeable NiMH packs. Use Value: Wide 3.5–16 V input range accommodates battery voltage decay; ±100 mV load regulation ensures analog accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADP1147AR-5 | Same electrical specs but in SOIC-8 package (θJA = 150°C/W); no PDIP footprint compatibility | Better suited for automated SMT assembly; requires PCB redesign for thermal pad layout | Select AR-5 for volume production with reflow capability; AN-5 preferred for through-hole prototyping or legacy board reuse. |
| ADP1148AR-5 | Higher efficiency (>96%), lower IQ (120 µA sleep), supports wider VIN (2.7–20 V), but requires different CT sizing and compensation | Enables lower-voltage battery operation (e.g., single LiFePO₄) and tighter load regulation (±30 mV) | Choose ADP1148AR-5 only if upgrading for improved light-load efficiency or extended input range; not drop-in compatible due to altered compensation requirements. |
Compared with ADP1147AR-5, the ADP1147AN-5 offers identical regulation performance but superior thermal dissipation in through-hole layouts; versus ADP1148AR-5, it trades higher light-load IQ and narrower VIN for proven design simplicity and direct replacement in existing PDIP-based schematics.
Availability
ADP1147AN-5 is available at Aetrix Electronics and suitable for portable computers, GPS systems, and handheld instruments requiring stable component supply with long-term industrial availability.
Supply support for ADP1147AN-5 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, headquartered in Norwood, MA.
The ADP1147AN-5 belongs to Analog Devices' high-efficiency DC/DC controller product line, engineered specifically for portable and battery-powered applications demanding low quiescent current, wide input range, and robust transient response.
FAQ
What is the regulated output voltage of the ADP1147AN-5?
The ADP1147AN-5 provides a fixed 5.05 V output voltage with ±100 mV load regulation over 5 mA to 2 A output current and ±40 mV line regulation from VIN = 7 V to 12 V. This specification is guaranteed per the ADP1147-3.3/ADP1147-5 datasheet Rev. 0, Table "REGULATED OUTPUT VOLTAGE" for ADP1147-5 at ILOAD = 700 mA and VIN = 9 V.
Does the ADP1147AN-5 support external P-channel MOSFETs only?
Yes, the ADP1147AN-5 is explicitly designed to drive external P-channel MOSFETs, as confirmed by its P-DRIVE pin output swing (VIN to GND) and functional block diagram. The datasheet specifies use cases with IRF7204 and IRF7403 P-MOSFETs, and warns against exceeding absolute maximum VGS ratings when selecting logic-level devices.
What is the purpose of the CT pin on the ADP1147AN-5?
The CT pin on the ADP1147AN-5 connects to an external timing capacitor that sets the device's off-time and thus its switching frequency. Discharge current into CT is proportional to VOUT, enabling constant off-time operation. With CT = 390 pF, typical off-time is 3.8–6 µs, yielding ~250 kHz operation at VIN = 9 V per Figure 4 and the Electrical Characteristics table.
How does the ADP1147AN-5 enter and exit sleep mode?
The ADP1147AN-5 enters sleep mode when extremely low load currents cause CT voltage to decay below VTH2, tripping comparator S and asserting internal sleep bar. It exits sleep mode when comparator V resets R-S flip-flop #2 upon VOUT dropping to VOS level. Sleep mode reduces supply current to 160 µA typical at VIN = 10 V, as specified in the "INPUT DC SUPPLY CURRENT" table.
Can the ADP1147AN-5 be used with N-channel MOSFETs?
No-the ADP1147AN-5 is not designed for N-channel MOSFETs. Its P-DRIVE pin outputs a high-side gate drive referenced to VIN, optimized for P-MOSFET source-connected-to-VIN topology. Figure 21 shows an N-MOSFET variant using additional transistor-level level-shifting circuitry, confirming the base ADP1147AN-5 requires external P-MOSFETs for direct operation.
ADP1147AN-5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 3.5V ~ 16V
- Frequency - Switching:
- Up to 250kHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
ADP1147AN-5 FAQ
1.How can I place an order for ADP1147AN-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP1147AN-5 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADP1147AN-5 reliable?
The price and inventory of ADP1147AN-5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP1147AN-5 is usually 5 days.
3.What payment methods are accepted for ADP1147AN-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP1147AN-5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP1147AN-5?
ADP1147AN-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP1147AN-5 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADP1147AN-5?
For technical support, including ADP1147AN-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP1147AN-5 requirements.
6.How does Aetrix verify that ADP1147AN-5 is sourced from the original manufacturer or authorized distributors?
All ADP1147AN-5 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADP1147AN-5 meets industry standards.
7.What is the process for return or replacement of ADP1147AN-5?
All ADP1147AN-5 units undergo pre-shipment inspection (PSI). If there is an issue with ADP1147AN-5, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADP1147AN-5 part is unused and in its original packaging.
Return procedure for ADP1147AN-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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