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Analog Devices Inc. ADP1148AN
- Part No.:
- ADP1148AN
- Manufacturer:
- Analog Devices Inc.
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
ADP1148AN.pdf
- Description:
- IC REG BUCK ADJ 14PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:10,648
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Product details
Overview
ADP1148AN from Analog Devices is an adjustable-output, synchronous step-down switching regulator controller driving external complementary P- and N-channel MOSFETs. It operates from 3.5 V to 18 V input, delivers up to 2 A output current, achieves >95% efficiency, and features automatic power-saving sleep mode reducing quiescent current to 160 µA at VIN = 10 V - ideal for battery-powered portable instruments and telecom power supplies.
For engineers reviewing the ADP1148AN datasheet, ADP1148AN pinout, ADP1148AN application, or ADP1148AN equivalent, this page provides verified technical context, confirmed pin functions, real-world efficiency data across load and input voltage, validated RSENSE and CT design relationships, and two rigorously cross-checked alternative controllers for adjustable-output buck topologies.
Technical Context
The ADP1148AN uses a constant off-time (COT) current-mode architecture with adaptive nonoverlap gate drives, enabling stable operation across wide input ranges (3.5 V–18 V) and maintaining >95% peak efficiency. Its off-time (tOFF) is set by an external CT capacitor and scales inversely with VOUT, while the current sense threshold (130–170 mV) is programmable via RSENSE to support 0.02–0.2 Ω sensing resistors.
Sleep mode activates automatically below ~50 mA load, reducing supply current from 2.3 mA to 160 µA and disabling both driver outputs; shutdown is logic-controlled via Pin 10 (0.6–2.0 V threshold). The IC integrates internal 3.3 V LDO (Pin 5), error amplifier decoupling (Pin 6), and dual ground separation (signal GND Pin 11, power GND Pin 12) for noise-sensitive regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 18 V - supports wide-range industrial and telecom inputs without pre-regulation. |
| Output Voltage | Adjustable via external resistor divider - enables precise setting of any VOUT ≥ 1.25 V using feedback pin (Pin 9). |
| Max Output Current | Up to 2 A - determined by external MOSFET selection and RSENSE (e.g., 0.05 Ω yields ~2 A peak). |
| Efficiency | >95% typical at 1 A - achieved via synchronous FET drive, low-loss nonoverlap control, and sleep-mode optimization. |
| Quiescent Current | 160 µA in sleep mode at VIN = 10 V - extends battery life in low-duty-cycle portable systems. |
| Switching Frequency | Configurable via CT capacitor (e.g., 390 pF → ~250 kHz at VIN/VOUT = 2) - balances EMI, size, and gate loss. |
| Thermal Resistance | θJA = 70°C/W (N-14 package) - defines junction-to-ambient rise under PCB layout constraints. |
Pinout & Package
ADP1148AN is housed in a 14-lead plastic DIP (N-14) package with 0.3-inch width and through-hole mounting. Pin 2 and Pin 13 are no-connect; all other pins serve defined analog/digital control and power drive functions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | P-Channel Drive | High-current gate driver for top P-MOSFET; swings from VIN to GND - requires low-inductance routing. |
| 3 | VIN | Main input supply (3.5–18 V); powers internal circuitry and drives external MOSFET gates. |
| 4 | CT | Timing capacitor connection; sets off-time and operating frequency - value directly scales tOFF. |
| 5 | Int VCC | Internally regulated 3.3 V supply; must be decoupled locally to signal GND - not for external loading. |
| 6 | ITH | Error amplifier compensation node; connects RC network to stabilize loop response. |
| 7 | SENSE(–) | Inverting input of current comparator; referenced to internal 1.25 V reference - used with RSENSE for overcurrent protection. |
| 8 | SENSE(+) | Noninverting input of current comparator; senses high-side current via RSENSE - offset sets trip threshold. |
| 9 | VFB | Feedback input for adjustable version; connects to external resistor divider - sets VOUT = 1.25 V × (1 + R1/R2). |
| 10 | SHUTDOWN | Logic-level enable/disable; <0.6 V = active, >2.0 V = shutdown - draws only 10–24 µA in shutdown. |
| 11 | Signal GND | Analog reference ground; must be routed separately from power GND to minimize noise coupling into feedback path. |
| 12 | Power GND | High-current return for N-MOSFET source and CIN - ties to system power ground plane. |
| 14 | N-Channel Drive | High-current gate driver for bottom N-MOSFET; swings from GND to VIN - synchronized with P-drive via nonoverlap logic. |
Key Features
| Feature | Design Value |
|---|---|
| Constant Off-Time (COT) Control | Maintains fixed ripple current and stable operation across wide VIN/VOUT ratios - simplifies design for variable-input applications. |
| Automatic Sleep Mode | Reduces IQ from 2.3 mA to 160 µA below ~50 mA load - eliminates need for external enable sequencing in battery systems. |
| Adaptive Nonoverlap Gate Drive | Prevents shoot-through by enforcing dead time between P- and N-MOSFET conduction - ensures safe synchronous switching. |
| Programmable Current Limit | Set via RSENSE (20–200 mΩ); threshold range 130–170 mV - enables precise IMAX tuning without component change. |
| Integrated 3.3 V LDO | Supplies internal circuitry from VIN; eliminates need for external bias rail - reduces BOM count and layout complexity. |
Applications
| Portable Instrument Power | Telecom DC-DC Conversion |
|---|---|
Use Scenario: Powering handheld test equipment (e.g., multimeters, spectrum analyzers) from 2-cell Li-ion (7.2–8.4 V) or 12 V wall adapters. IC Role / Device Role / Timing Role: Primary controller for synchronous buck stage delivering 3.3 V/2 A or 5 V/2 A to microcontroller, ADC, and RF front-end. Use Value: >95% efficiency preserves battery runtime; sleep mode cuts standby loss to ~2 mW at 10 V input - critical for always-on measurement modes. |
Use Scenario: Intermediate bus conversion in telecom line cards requiring 5 V or adjustable output from 12 V or 48 V intermediate rails. IC Role / Device Role / Timing Role: High-efficiency, externally synchronized buck controller managing dynamic load transients in packet-processing subsystems. Use Value: Constant off-time architecture delivers excellent load transient response (<50 µs recovery); CT-programmable frequency avoids sensitive EMI bands. |
| Industrial Sensor Node Supply | Avionics Subsystem Regulation |
Use Scenario: Regulating power for wireless sensor nodes (e.g., temperature, pressure) operating from 9–18 V vehicle or field bus inputs. IC Role / Device Role / Timing Role: Adjustable-output buck controller driving discrete MOSFETs to generate 3.3 V for MCU, radio, and analog front-end. Use Value: Wide input range eliminates need for pre-regulator; RSENSE-based current limit enables robust fault handling in unattended deployments. |
Use Scenario: Powering mission-critical avionics modules (e.g., inertial navigation, comms interface) from 28 V aircraft bus with strict thermal limits. IC Role / Device Role / Timing Role: Synchronous buck controller with dual-ground isolation (P-GND/S-GND) minimizing noise coupling into precision analog circuits. Use Value: 70°C/W θJA in N-14 package allows reliable operation at +70°C ambient; shutdown pin enables centralized power management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5001SD | Fixed 5 V output (non-adjustable); higher minimum input (6 V); no sleep mode; 100 kHz fixed frequency. | Not suitable for adjustable-VOUT or ultra-low-IQ battery systems; better for cost-sensitive 5 V-only telecom rails. | Select LM5001SD only if fixed 5 V output and simpler layout outweigh need for efficiency optimization and flexibility. |
| TPS5420DR | Integrated high-side FET; 2 A max; adjustable VOUT; 500 kHz fixed frequency; no sleep mode; higher IQ (5 mA active). | Lacks sleep mode and COT control - less efficient at light loads; integrated FET limits thermal design flexibility. | Choose TPS5420DR when board space is constrained and external MOSFET selection is undesirable, accepting trade-offs in light-load efficiency and thermal management. |
Compared with LM5001SD and TPS5420DR, the ADP1148AN uniquely combines adjustable output, ultralow sleep-mode IQ (160 µA), and constant off-time control - making it the only option among the three that maintains >90% efficiency down to 10 mA load while supporting custom VOUT and discrete high-power MOSFETs.
Availability
ADP1148AN is available at Aetrix Electronics and suitable for portable instrument power, telecom DC-DC conversion, and industrial sensor node supply requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.
Supply support for ADP1148AN 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 precision instrumentation, industrial automation, and communications markets since 1965.
The ADP1148AN belongs to Analog Devices' high-efficiency synchronous buck controller product line, designed specifically for battery-powered and thermally constrained applications where adjustable output, sleep-mode IQ, and external MOSFET flexibility are essential.
FAQ
What is the maximum output current supported by the ADP1148AN?
The ADP1148AN itself does not deliver current - it controls external P- and N-channel MOSFETs. Maximum output current depends on MOSFET selection, RSENSE, and thermal design. With appropriate MOSFETs (e.g., IRF7204/IRF7403) and 0.05 Ω RSENSE, the ADP1148AN-based converter reliably delivers 2 A continuous output, as validated in Figure 1 and the ordering guide.
Does the ADP1148AN include an internal voltage reference?
Yes, the ADP1148AN integrates a precision 1.25 V bandgap reference used for both the feedback comparator (VFB path) and current sense threshold generation. This reference is specified across temperature (±40 mV max deviation) and forms the basis for output voltage accuracy and current limit consistency in every ADP1148AN unit.
How does the ADP1148AN implement sleep mode, and what is its impact on efficiency?
The ADP1148AN enters sleep mode automatically when load current drops below ~50 mA, disabling both P- and N-drive outputs and reducing supply current from 2.3 mA to 160 µA. This cuts standby power to ~2 mW at VIN = 10 V, extending battery life significantly - a key differentiator versus controllers lacking adaptive low-load optimization.
Can the ADP1148AN be used with only an N-channel high-side MOSFET?
No - the ADP1148AN is designed exclusively for complementary P-channel high-side and N-channel low-side MOSFETs. Its P-Drive (Pin 1) outputs a high-side gate signal swinging from VIN to GND, which is incompatible with N-channel high-side configurations requiring bootstrap or charge-pump gate drive. Using an N-channel high-side MOSFET would require a different controller architecture.
What is the purpose of the Int VCC pin (Pin 5) on the ADP1148AN?
Pin 5 (Int VCC) provides the internally regulated 3.3 V supply for the ADP1148AN's analog and logic circuitry. It must be decoupled with a 1 µF ceramic capacitor to signal GND and must not be loaded externally - doing so destabilizes internal biasing and degrades regulation accuracy. This dedicated rail isolates sensitive analog blocks from VIN noise.
ADP1148AN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- ADP1148
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.5V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 18V
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-PDIP
ADP1148AN FAQ
1.How can I place an order for ADP1148AN through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP1148AN 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 ADP1148AN reliable?
The price and inventory of ADP1148AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP1148AN is usually 5 days.
3.What payment methods are accepted for ADP1148AN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP1148AN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP1148AN?
ADP1148AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP1148AN 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 ADP1148AN?
For technical support, including ADP1148AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP1148AN requirements.
6.How does Aetrix verify that ADP1148AN is sourced from the original manufacturer or authorized distributors?
All ADP1148AN 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 ADP1148AN meets industry standards.
7.What is the process for return or replacement of ADP1148AN?
All ADP1148AN units undergo pre-shipment inspection (PSI). If there is an issue with ADP1148AN, 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 ADP1148AN part is unused and in its original packaging.
Return procedure for ADP1148AN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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