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Analog Devices Inc. ADP1148AR-3.3
- Part No.:
- ADP1148AR-3.3
- Manufacturer:
- Analog Devices Inc.
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADP1148AR-3.3.pdf
- Description:
- IC REG BUCK 3.3V 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:24,190
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Product details
Overview
ADP1148AR-3.3 from Analog Devices is a synchronous step-down switching regulator controller designed to drive external complementary P- and N-channel MOSFETs in high-efficiency DC/DC conversion. It delivers a fixed 3.3 V output with ±3% regulation over 5 mA–2 A load, operates from 3.5 V–18 V input, and achieves >95% peak efficiency in notebook and portable instrumentation power supplies.
For engineers reviewing the ADP1148AR-3.3 datasheet, ADP1148AR-3.3 pinout, ADP1148AR-3.3 application, or ADP1148AR-3.3 equivalent, key selection factors include its constant off-time current-mode architecture, automatic sleep mode (250 µA quiescent), 3.3 V factory-trimmed feedback path, and SO-14 package compatibility with discrete FET gate drive requirements.
Technical Context
The ADP1148AR-3.3 implements a constant off-time (COT) current-mode control architecture that sets switching frequency via an external CT capacitor and maintains stable ripple current across wide VIN–VOUT differentials. Its internal voltage divider connects Sense(–) (Pin 7) directly to the regulated 3.3 V output, eliminating external feedback resistors.
Sleep mode activates automatically when load current drops below ~5 mA, reducing ground current from 2.3 mA to 250 µA while maintaining regulation via output capacitor discharge. Adaptive nonoverlap drive prevents shoot-through by enforcing sequencing between P-DRIVE (Pin 1) and N-DRIVE (Pin 14) outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±3% at 700 mA; enables direct replacement of linear regulators in 3.3 V logic rails. |
| Input Voltage Range | 3.5 V to 18 V; supports single-cell Li-ion up to 4S battery stacks and industrial 12 V rails. |
| Peak Efficiency | >95% at 1 A; achieved via synchronous FET switching and ultralow gate drive losses. |
| Quiescent Current | 250 µA in sleep mode at VIN = 10 V; extends battery life in always-on portable systems. |
| Switching Frequency | Adjustable via CT pin (e.g., 5 µs off-time with 390 pF yields ~200 kHz); avoids audible noise in sensitive audio applications. |
| Current Sense Threshold | 25 mV to 170 mV range; sets peak inductor current via external RSENSE for precise overcurrent protection. |
| Shutdown Threshold | 0.8 V typical; compatible with 1.8 V/3.3 V logic-level shutdown signals without level-shifting. |
Pinout & Package
ADP1148AR-3.3 is housed in a 14-lead Small Outline (SO-14) package with standard JEDEC MS-012AC dimensions (8.65 mm × 3.9 mm, 1.75 mm height). Pin 1 is P-DRIVE; Pin 14 is N-DRIVE; Pins 2 and 13 are NC; Pin 11 is Signal GND; Pin 12 is Power GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (P-DRIVE) | High-current gate driver output | Drives P-channel MOSFET source-to-drain; swing from VIN to GND; requires low-inductance layout. |
| 3 (VIN) | Main power input | Supplies internal circuitry and gate drive; must be decoupled with ≥100 µF + 1 µF ceramic. |
| 4 (CT) | Timing capacitor connection | Sets off-time and operating frequency; discharge current scales with VOUT for input-voltage compensation. |
| 5 (INT VCC) | Internal 3.3 V regulator output | Provides bias for internal analog blocks; must be decoupled to Signal GND with 3300 pF. |
| 7 (SENSE(–)) | Fixed-output feedback node | Internally connected to 3.3 V divider; no external resistor needed-reduces BOM count and layout area. |
| 8 (SENSE(+)) | Current sense comparator input | Paired with Pin 7 to detect RSENSE voltage drop; enables cycle-by-cycle current limiting. |
| 10 (SHUTDOWN) | Logic-controlled enable/disable | Pull to ≥0.8 V to disable both FETs; <0.6 V required for normal operation. |
| 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 path | Connects to N-MOSFET source and CIN (–); carries pulsed currents up to 2 A. |
| 14 (N-DRIVE) | High-current gate driver output | Drives N-channel MOSFET gate; swing from GND to VIN; requires tight loop with low-ESR bootstrap cap. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic sleep mode | Reduces IQ to 250 µA at light loads without external control-critical for GPS and cellular standby power budgets. |
| Synchronous FET drive | Eliminates external Schottky diode conduction loss; improves efficiency by 5–8% vs. asynchronous designs. |
| Adaptive nonoverlap timing | Prevents cross-conduction between P- and N-MOSFETs; ensures safe dead-time without external timing components. |
| Constant off-time architecture | Maintains stable ripple current across 3.5–18 V input range-simplifies inductor selection and improves transient response. |
| Fixed 3.3 V internal feedback | Removes need for external resistor divider; reduces component count, layout area, and tolerance-induced output error. |
Applications
| Notebook Power Rails | Portable Instrumentation |
|---|---|
Use Scenario: Regulating 3.3 V supply for CPU I/O, USB PHY, and memory interfaces in ultra-thin notebooks with 2-cell Li-ion input. IC Role / Device Role / Timing Role: Primary step-down controller driving IRF7204/IRF7403 MOSFET pair; manages dynamic load transients during processor burst activity. Use Value: >95% efficiency at 1.5 A extends battery runtime by 12–18 minutes per charge cycle versus LDO alternatives. | Use Scenario: Powering precision ADCs, op-amps, and microcontrollers in handheld multimeters and environmental sensors. IC Role / Device Role / Timing Role: Fixed 3.3 V regulator with sleep mode enabling <10 µW system standby power when measurement is idle. Use Value: 250 µA sleep current allows >1-year battery life on two AA cells in low-duty-cycle data logging. |
| Industrial Remote I/O | Avionics Display Backlight |
Use Scenario: Converting 12 V vehicle or rail power to stable 3.3 V for CAN transceiver, isolation ICs, and FPGA configuration memory. IC Role / Device Role / Timing Role: High-reliability DC/DC controller with short-circuit protection and 150°C junction rating for harsh environments. Use Value: 18 V absolute max input withstands automotive load-dump transients without external clamping. | Use Scenario: Supplying 3.3 V logic power to LCD controller and touch interface in cockpit display units with strict EMI limits. IC Role / Device Role / Timing Role: Low-noise synchronous controller with adjustable frequency (via CT) to avoid interference with RF comms bands. Use Value: Constant off-time architecture ensures consistent switching behavior across wide temperature (-40°C to +85°C) and input range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54302DDAR | Integrated 3.3 V LDO + 2 A FETs; no external MOSFETs required; 2.95–6 V input only. | Better for space-constrained designs where board area is premium; unsuitable for >6 V input or >2 A loads. | Select TPS54302DDAR when replacing ADP1148AR-3.3 in low-input-voltage, low-power applications with strict size constraints. |
| LTC3850EGN#PBF | Adjustable output (0.6–5 V); supports 4–36 V input; requires external feedback resistors and gate drivers. | Preferred for multi-rail systems requiring programmable outputs or higher input voltage tolerance than ADP1148AR-3.3. | Select LTC3850EGN#PBF when flexibility in output voltage and extended input range outweigh fixed 3.3 V convenience. |
Compared with TPS54302DDAR and LTC3850EGN#PBF, the ADP1148AR-3.3 offers unique value in fixed 3.3 V applications requiring >6 V input support, discrete FET optimization for thermal management, and automatic sleep mode without external enable sequencing.
Availability
ADP1148AR-3.3 is available at Aetrix Electronics and suitable for notebook computing, portable instrumentation, industrial remote I/O, avionics displays, and telecom power supplies requiring stable component supply and long-term lifecycle continuity.
Supply support for ADP1148AR-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, serving industrial, automotive, communications, and healthcare markets since 1965.
The ADP1148AR-3.3 belongs to Analog Devices' high-efficiency synchronous buck controller family, engineered specifically for battery-powered and thermally constrained portable systems demanding >95% efficiency and micropower sleep operation.
FAQ
What is the maximum input voltage supported by the ADP1148AR-3.3?
The ADP1148AR-3.3 supports an absolute maximum input voltage of +20 V on the VIN pin (Pin 3), with recommended continuous operation from 3.5 V to 18 V. Exceeding 18 V may trigger internal protection but is not guaranteed for sustained use. The device's 110°C/W thermal resistance in SO-14 package requires careful attention to PCB copper area when operating near upper voltage/current limits.
Does the ADP1148AR-3.3 require external feedback resistors to set the 3.3 V output?
No, the ADP1148AR-3.3 does not require external feedback resistors. Its internal voltage divider is factory-trimmed to regulate precisely at 3.3 V, with Sense(–) (Pin 7) directly connected to the internal reference network. This eliminates resistor tolerance errors and reduces component count-unlike the adjustable ADP1148 version which uses VFB (Pin 9) with external dividers.
How does sleep mode activate and what is its impact on output regulation in the ADP1148AR-3.3?
Sleep mode in the ADP1148AR-3.3 activates automatically when load current falls below ~5 mA, reducing ground current to 250 µA. During sleep, the P- and N-MOSFETs are disabled and the output is maintained solely by the output capacitor. Output voltage droop is limited to 50 mV p-p, and regulation resumes within microseconds once load increases past the wake-up threshold.
Can the ADP1148AR-3.3 drive logic-level MOSFETs with VIN below 8 V?
Yes, the ADP1148AR-3.3 can drive logic-level MOSFETs when VIN drops below 8 V. Its P-DRIVE (Pin 1) and N-DRIVE (Pin 14) outputs swing rail-to-rail (VIN to GND), enabling full enhancement of logic-level devices (VGS(TH) < 2.5 V). For reliable turn-on at low VIN, select MOSFETs with RDS(ON) specified at VGS = 4.5 V or lower, such as the Si2302 or DMN2004U.
What is the purpose of the CT pin (Pin 4) and how is it used in the ADP1148AR-3.3?
The CT pin (Pin 4) in the ADP1148AR-3.3 sets the off-time and thus the switching frequency via an external capacitor. A 390 pF capacitor yields ~200 kHz at 12 V input, with frequency decreasing as VIN approaches VOUT. The CT discharge current scales with VOUT, providing inherent input-voltage compensation-eliminating need for complex frequency compensation networks.
ADP1148AR-3.3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- ADP1148
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 14-SO
ADP1148AR-3.3 FAQ
1.How can I place an order for ADP1148AR-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP1148AR-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 ADP1148AR-3.3 reliable?
The price and inventory of ADP1148AR-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 ADP1148AR-3.3 is usually 5 days.
3.What payment methods are accepted for ADP1148AR-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP1148AR-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP1148AR-3.3?
ADP1148AR-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP1148AR-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 ADP1148AR-3.3?
For technical support, including ADP1148AR-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP1148AR-3.3 requirements.
6.How does Aetrix verify that ADP1148AR-3.3 is sourced from the original manufacturer or authorized distributors?
All ADP1148AR-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 ADP1148AR-3.3 meets industry standards.
7.What is the process for return or replacement of ADP1148AR-3.3?
All ADP1148AR-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with ADP1148AR-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 ADP1148AR-3.3 part is unused and in its original packaging.
Return procedure for ADP1148AR-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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