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Analog Devices Inc. ADP1148AN-3.3
- Part No.:
- ADP1148AN-3.3
- Manufacturer:
- Analog Devices Inc.
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
ADP1148AN-3.3.pdf
- Description:
- IC REG BUCK 3.3V 14PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:14,962
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Product details
Overview
ADP1148AN-3.3 from Analog Devices is a fixed-output (3.3 V), synchronous step-down switching regulator controller in 14-lead plastic DIP (N-14) package, operating from 3.5 V to 18 V input, delivering up to 2 A output current with >95% peak efficiency and automatic power-saving sleep mode. It drives external complementary P- and N-channel MOSFETs using constant off-time current-mode control for excellent transient response in portable power systems.
For engineers reviewing the ADP1148AN-3.3 datasheet, ADP1148AN-3.3 pinout, ADP1148AN-3.3 application, or ADP1148AN-3.3 equivalent, key selection criteria include its fixed 3.3 V output, sleep-mode quiescent current of 160–250 µA, shutdown threshold of 0.6–2.0 V, CT-pin programmable frequency, and internal voltage divider eliminating external feedback resistors.
Technical Context
The ADP1148AN-3.3 implements a constant off-time (COT) current-mode architecture with adaptive nonoverlap gate drive, where tOFF is set by an external CT capacitor and scales with VOUT. Its internal voltage divider connects Sense(–) (Pin 7) directly to the regulated output, enabling fixed 3.3 V operation without external resistors.
Sleep mode activates automatically below ~5 mA load, reducing ground current from 1.6 mA to 160–250 µA while maintaining regulation via output capacitor discharge; shutdown disables both MOSFET drivers when Pin 10 exceeds 0.8 V, drawing only 10–24 µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±3% (3.23–3.43 V at 700 mA), internally trimmed - eliminates external feedback network |
| Input Voltage Range | 3.5 V to 18 V - supports wide-input battery and industrial supply rails |
| Max Output Current | 2 A - determined by external RSENSE and MOSFET selection, not IC-limited |
| Efficiency | >95% peak - achieved via synchronous P/N-FET drive and ultralow gate drive losses |
| Sleep Mode IQ | 160–250 µA - enables multi-day battery life in low-power standby states |
| Shutdown Current | 10–24 µA - ensures minimal drain during system hibernation |
| Off-Time (tOFF) | 4–6 µs (CT = 390 pF, ILOAD = 700 mA) - sets minimum switching period and ripple current |
| Operating Temp | 0°C to +70°C (commercial) - validated for notebook, telecom, and avionics ambient conditions |
Pinout & Package
ADP1148AN-3.3 is housed in a 14-lead plastic dual in-line package (DIP), N-14, with 0.3-inch body width and through-hole mounting. Thermal resistance θJA = 70°C/W enables moderate power dissipation without heatsinking in typical PCB layouts.
| 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 layout |
| 3 | VIN | Main input supply (3.5–18 V); powers internal circuitry and gate drivers - must be decoupled with ≥100 µF + 1 µF ceramic |
| 4 | CT | Timing capacitor node; sets switching frequency via discharge current proportional to VOUT - CT = 390 pF yields ~250 kHz at VIN = 2×VOUT |
| 5 | Int VCC | Internally regulated 3.3 V supply; powers analog blocks - must be decoupled to Signal GND with 1 µF ceramic |
| 7 | SENSE(–) | Inverting input of current comparator and internal voltage divider tap for 3.3 V regulation - connects directly to output rail |
| 8 | SENSE(+) | Noninverting input of current comparator; senses RSENSE voltage drop - sets peak inductor current trip point |
| 10 | SHUTDOWN | Logic-controlled enable/disable; <0.6 V = active, >0.8 V = shutdown - compatible with 1.8/3.3/5 V logic |
| 11 | Signal GND | Analog reference for feedback and sensing - must be routed separately from Power GND to minimize noise coupling |
| 12 | Power GND | Return path for N-MOSFET source and CIN - ties to high-current return plane, not Signal GND |
| 14 | N-Channel Drive | High-current gate driver for bottom N-MOSFET; swings from GND to VIN - requires tight loop with Power GND |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Sleep Mode | Maintains regulation at <5 mA load with 160–250 µA IQ - extends battery runtime without external enable sequencing |
| Synchronous FET Drive | Drives complementary P/N-MOSFETs with adaptive nonoverlap timing - eliminates body-diode conduction loss and improves light-load efficiency |
| Constant Off-Time Control | tOFF fixed per cycle (4–6 µs), frequency varies with VIN/VOUT - simplifies EMI filtering and ensures stable operation across wide input range |
| Internal Voltage Divider | Fixed 3.3 V reference derived from Sense(–) pin - removes need for external resistor network and associated tolerance/temperature drift |
| Short-Circuit Protection | Current-limiting via RSENSE and adaptive tOFF extension - prevents thermal runaway during output faults without latch-off |
| Very Low Dropout | P-MOSFET remains fully on when VIN – VOUT < 1.5 V - sustains regulation down to near-battery-dead conditions |
Applications
| Portable Instrumentation | Notebook Computing |
|---|---|
Use Scenario: Handheld multimeter with LCD display, microcontroller, and analog front-end powered from two AA cells (2.4–3.2 V) boosted to 3.3 V rail. IC Role / Device Role / Timing Role: Step-down controller regulating 3.3 V supply for MCU and sensors; manages dynamic load steps from ADC sampling bursts. Use Value: Sleep mode reduces idle current to <250 µA, enabling >1-year battery life; fixed 3.3 V output eliminates calibration drift from resistor tolerances. |
Use Scenario: Core logic voltage rail in ultra-thin notebook, fed from 5–12 V adapter or battery, powering CPU I/O, USB PHY, and memory interface. IC Role / Device Role / Timing Role: Primary 3.3 V DC/DC controller driving IRF7204/IRF7403 MOSFET pair; handles rapid 0–2 A load transients during processor wake/sleep cycles. Use Value: >95% efficiency minimizes thermal load in confined chassis; adaptive nonoverlap prevents shoot-through during high-frequency switching. |
| Avionics Power Distribution | GPS Navigation Systems |
Use Scenario: 28 V aircraft bus converted to regulated 3.3 V for flight-critical GPS receiver module with MIL-STD-704 compliance. IC Role / Device Role / Timing Role: Input-stage buck controller handling wide-line transients (16–40 V) and cold-cranking dips; maintains regulation during engine start. Use Value: 3.5–18 V input range accommodates 28 V bus derating; shutdown pin allows centralized power sequencing per ARINC 653 partitioning. |
Use Scenario: Automotive-grade GPS tracker with backup supercapacitor, requiring continuous 3.3 V supply during ignition-off periods. IC Role / Device Role / Timing Role: Always-on power controller managing supercapacitor discharge into 3.3 V rail; transitions seamlessly between main battery and backup source. Use Value: Sleep mode IQ of 160–250 µA enables >72-hour hold-up time; very low dropout sustains operation as supercapacitor voltage decays to 3.5 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADP1148AR-3.3 | Same electrical specs, but in SO-14 surface-mount package (θJA = 110°C/W) - higher thermal resistance than N-14 | Preferred for space-constrained PCBs; requires reflow-compatible layout and no through-hole mounting | Select when board area is limited and thermal margin permits higher junction temperature rise |
| TPS54302DDCR | Integrated 3.3 V buck converter (no external FETs), 3.5–28 V input, 3 A output, 1.5 MHz fixed frequency - no CT pin or sleep mode | Reduces BOM count and layout complexity; lacks adaptive sleep mode and COT architecture | Choose for simpler design with lower component count where 95%+ efficiency at light load is not required |
Compared with ADP1148AN-3.3, ADP1148AR-3.3 offers identical functionality in a smaller footprint but trades thermal performance for size, while TPS54302DDCR replaces discrete FETs with integrated switches at the cost of fixed-frequency operation and no automatic sleep mode - making ADP1148AN-3.3 optimal for high-efficiency, battery-sensitive, thermally relaxed designs.
Availability
ADP1148AN-3.3 is available at Aetrix Electronics and suitable for notebook computing, portable instrumentation, and avionics power distribution requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for ADP1148AN-3.3 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, founded in 1965 and headquartered in Wilmington, MA.
The ADP1148 family was designed specifically for high-efficiency, low-quiescent-current synchronous buck control in portable and battery-powered systems - emphasizing sleep-mode optimization, wide input range, and robust MOSFET drive capability.
FAQ
What is the function of the CT pin on the ADP1148AN-3.3?
The CT pin on the ADP1148AN-3.3 sets the switching frequency via an external capacitor; its discharge current is proportional to VOUT, resulting in a constant off-time architecture. With CT = 390 pF, ADP1148AN-3.3 achieves ~250 kHz at VIN = 2×VOUT. Frequency decreases as VIN drops, preventing audible noise near dropout. The ADP1148AN-3.3 does not require external frequency compensation because the CT network inherently stabilizes the control loop.
Does the ADP1148AN-3.3 require external feedback resistors to set its output voltage?
No - the ADP1148AN-3.3 uses an internal voltage divider connected to the Sense(–) pin (Pin 7), which is tied directly to the output rail, to establish its fixed 3.3 V regulation point. This eliminates external feedback resistors, removing their tolerance, temperature drift, and layout sensitivity. In contrast, the adjustable ADP1148 version requires external resistors on VFB (Pin 9), but ADP1148AN-3.3 bypasses VFB entirely.
How does sleep mode operate in the ADP1148AN-3.3, and what is its impact on output regulation?
Sleep mode in the ADP1148AN-3.3 activates automatically when load current falls below ~5 mA, reducing ground current from 1.6 mA to 160–250 µA. During sleep, both MOSFET drivers are disabled and the output is sustained solely by the output capacitor. Regulation is maintained until VOUT droops enough to reset the internal comparator, triggering resumption of switching. ADP1148AN-3.3's sleep-mode ripple is specified at ≤50 mVp-p at zero load.
What MOSFETs are recommended for use with the ADP1148AN-3.3, and why?
Analog Devices recommends IRF7204 (P-channel) and IRF7403 (N-channel) MOSFETs for the ADP1148AN-3.3, as validated in Figure 1 of the datasheet. These devices provide low RDS(ON), appropriate VGS(TH) (<2.5 V for logic-level drive), and fast switching characteristics compatible with the ADP1148AN-3.3's adaptive nonoverlap drive. Using mismatched or high-threshold MOSFETs risks shoot-through, reduced efficiency, or failure to start under low-VIN conditions.
Can the ADP1148AN-3.3 be used in dropout conditions, and how does it behave?
Yes - the ADP1148AN-3.3 operates in dropout when VIN – VOUT < 1.5 V. In this region, the controller increases CT discharge current to shorten tOFF, preventing audible switching and maintaining regulation. The P-channel MOSFET remains continuously on, functioning as a low-dropout linear pass element, while the N-channel MOSFET stays off. This behavior allows ADP1148AN-3.3 to sustain 3.3 V output down to VIN ≈ 3.5 V, critical for end-of-battery-life operation.
ADP1148AN-3.3 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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.5V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- 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-3.3 FAQ
1.How can I place an order for ADP1148AN-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP1148AN-3.3 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-3.3 reliable?
The price and inventory of ADP1148AN-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP1148AN-3.3 is usually 5 days.
3.What payment methods are accepted for ADP1148AN-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP1148AN-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP1148AN-3.3?
ADP1148AN-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP1148AN-3.3 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-3.3?
For technical support, including ADP1148AN-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP1148AN-3.3 requirements.
6.How does Aetrix verify that ADP1148AN-3.3 is sourced from the original manufacturer or authorized distributors?
All ADP1148AN-3.3 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-3.3 meets industry standards.
7.What is the process for return or replacement of ADP1148AN-3.3?
All ADP1148AN-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with ADP1148AN-3.3, 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-3.3 part is unused and in its original packaging.
Return procedure for ADP1148AN-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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