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Analog Devices Inc. LT3463AEDD#PBF
- Part No.:
- LT3463AEDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3463AEDD#PBF.pdf
- Description:
- IC REG BST CHG PUMP ADJ DL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:18,339
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Product details
Overview
LT3463AEDD#PBF from Analog Devices (formerly Linear Technology) is a dual micropower DC/DC converter IC with integrated 42V NPN switches and internal Schottky diodes, delivering regulated +15V and –8V outputs from a 2.4V–15V input. It features 20µA quiescent current per channel, 300ns minimum off-time, and separate shutdown pins for independent control-designed for CCD and LCD bias generation in portable imaging systems.
For engineers reviewing the LT3463AEDD#PBF datasheet, LT3463AEDD#PBF pinout, LT3463AEDD#PBF application, or LT3463AEDD#PBF equivalent, key selection criteria include its dual-output ±40V capability, 400mA negative-channel current limit (vs. 250mA on LT3463), DFN-10 (3mm × 3mm) package with exposed GND pad, and fixed off-time control architecture enabling high efficiency at light loads.
Technical Context
The LT3463AEDD#PBF integrates two independent constant off-time switching regulators: a boost converter (Switcher 1) generating positive output via internal Schottky diode (VOUT1), and an inverting converter (Switcher 2) generating negative output using internal Schottky diode D2 and VREF reference. Each uses a 300ns minimum off-time one-shot timer and current-limit sensing to regulate output voltage through FB1 (1.25V threshold) and FB2 (0–12mV threshold).
Switcher 1 employs a 180mV VCE(SAT) NPN switch rated to 42V with 250mA current limit; Switcher 2 uses a matched 42V NPN switch with 400mA current limit and lower sense resistance (RS2 = 0.063Ω vs. 0.1Ω on LT3463). Both channels achieve <1µA shutdown current and operate across –40°C to 85°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.4V to 15V - supports single-cell Li-ion, 3.3V/5V rails, and wide-input industrial supplies. |
| Positive Output Current Limit | 250mA - sets maximum load for +VOUT1 without foldback or thermal shutdown. |
| Negative Output Current Limit | 400mA - enables higher-current –VOUT2 delivery than LT3463 (250mA), critical for CCD sensor bias. |
| Quiescent Current | 20µA per converter - ensures >1000-hour battery life in always-on bias applications. |
| Switch Off-Time | 300ns minimum - allows use of sub-10µH inductors, reducing solution size and cost. |
| Internal Switch Rating | 42V collector-emitter - supports ±40V outputs without external transformers or cascaded stages. |
| Reference Voltage | 1.25V on VREF pin - provides precision feedback reference for negative output programming via R3/R4 divider. |
Pinout & Package
LT3463AEDD#PBF is housed in a 10-lead 3mm × 3mm plastic DFN package with exposed GND pad (Pin 11), requiring soldering to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1 (Pin 10) | Feedback input for Switcher 1 | Monitors +VOUT1 via resistor divider; trips comparator at 1.25V to terminate switch on-time. |
| SHDN1 (Pin 9) | Enable/disable control for Switcher 1 | Pull >1.5V to enable +VOUT1; pull <0.3V to enter <1µA shutdown - supports dynamic power sequencing. |
| SHDN2 (Pin 8) | Enable/disable control for Switcher 2 | Independent control of –VOUT2; enables staggered startup or fault isolation between rails. |
| VREF (Pin 7) | 1.25V reference output | Stable reference used with FB2 to set negative output voltage; rejects input ripple and temperature drift. |
| FB2 (Pin 6) | Feedback input for Switcher 2 | Senses voltage difference between VREF and –VOUT2; comparator triggers at 0–12mV for inverting regulation. |
| VOUT1 (Pin 1) | Positive output node | Cathode of internal Schottky diode; connects directly to output capacitor - no external diode required. |
| SW1 (Pin 2) | Boost switch collector | Drives inductor L1; requires minimal trace area to suppress EMI from fast 300ns edge transitions. |
| VIN (Pin 3) | Main input supply | Shared input for both converters; must be bypassed with ≥1µF ceramic capacitor adjacent to pin. |
| SW2 (Pin 4) | Inverting switch collector | Switches ground return path for L2; voltage swing equals |VIN| + |VOUT2| - limits max input for high-negative outputs. |
| D2 (Pin 5) | Anode of internal Schottky diode | Connects to SW2 and GND; completes inverting topology - eliminates need for external diode in –VOUT2 path. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent shutdown controls | Enables selective rail activation (e.g., power CCD analog bias before digital logic), reducing system-level standby current. |
| 400mA negative-channel current limit | Supports higher-capacitance CCD bias loads (e.g., 50mA @ –8V) without derating or external current boosting. |
| 300ns minimum off-time | Permits use of 4.7µH–10µH inductors instead of larger 22µH+ values, cutting board area by >30% in space-constrained cameras. |
| Integrated 42V Schottky diodes | Eliminates two external diodes, reduces BOM count, and improves reliability by removing solder joint failure points. |
| Exposed GND pad (Pin 11) | Provides 3°C/W junction-to-case thermal resistance - maintains <100°C junction temp at full 400mA load in 2-layer PCB designs. |
Applications
| CCD Bias Supply | LCD Bias Generation |
|---|---|
Use Scenario: Providing stable +15V and –8V bias to charge-coupled device (CCD) image sensors in digital cameras and medical endoscopes. IC Role / Device Role / Timing Role: Dual-rail DC/DC converter generating isolated, low-noise analog supply rails synchronized to pixel readout timing. Use Value: Enables full-frame CCD operation with <10mV output ripple and 20µA quiescent draw - extending battery runtime while maintaining SNR >72dB. | Use Scenario: Generating ±20V gate drive voltages for active-matrix LCD panels in handheld computers and portable test equipment. IC Role / Device Role / Timing Role: Compact dual-output regulator delivering programmable positive/negative panel bias with independent enable sequencing. Use Value: Achieves ±20V at 9mA from 2.7V input using only two 10µH inductors and ceramic caps - reducing solution height to <1.2mm. |
| Handheld Computer Power | Digital Camera Core Supply |
Use Scenario: Supplying auxiliary analog rails (+12V, –5V) for audio codecs, touch controllers, and RF front-ends in ruggedized PDAs. IC Role / Device Role / Timing Role: Micropower secondary regulator activated only during peripheral use, minimizing system-wide idle current. Use Value: Delivers 12V/50mA and –5V/30mA with <1µA shutdown leakage - contributing <0.5% to total system standby power budget. | Use Scenario: Powering image signal processor (ISP) analog blocks and lens actuator drivers requiring tightly regulated ±12V rails. IC Role / Device Role / Timing Role: Dual-channel converter with independent SHDN pins enabling precise power-up order: VOUT2 (–12V) first, then VOUT1 (+12V) after 100µs delay. Use Value: Prevents latch-up in ISP analog cores by enforcing correct voltage sequencing - eliminating field returns due to improper bias ramp. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3463EDD#PBF | Same package and pinout; negative channel limited to 250mA (vs. 400mA on LT3463A); identical positive channel specs. | Lower-cost option for ≤250mA –VOUT2 loads; unsuitable for high-current CCD bias where LT3463AEDD#PBF's 400mA rating prevents thermal throttling. | Select LT3463EDD#PBF only when negative output current demand is confirmed ≤200mA with margin. |
| LT1945EMS#PBF | MSOP-10 package; 350mA per channel; wider 1.2V–15V input range; no internal Schottky diodes - requires external diodes. | Higher input flexibility for ultra-low-voltage systems (e.g., 1.8V logic rails); external diodes increase footprint and reduce efficiency at light loads. | Choose LT1945EMS#PBF when input voltage may dip below 2.4V or when MSOP-10 layout reuse is prioritized over BOM simplification. |
Compared with LT3463EDD#PBF, LT3463AEDD#PBF delivers 60% more negative output current without changing PCB layout; versus LT1945EMS#PBF, it reduces component count by two diodes and improves light-load efficiency by 8–12% due to integrated Schottky devices.
Availability
LT3463AEDD#PBF is available at Aetrix Electronics and suitable for CCD bias supply, LCD panel driver, handheld computer auxiliary power, and digital camera core supply applications requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for LT3463AEDD#PBF 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, Inc. (ADI) is a global semiconductor leader specializing in high-performance analog, mixed-signal, and power management ICs for precision instrumentation, industrial automation, and communications infrastructure.
The LT3463AEDD#PBF belongs to ADI's legacy Linear Technology micropower DC/DC converter product line, engineered specifically for space-constrained, battery-powered imaging and display systems demanding dual-polarity bias with minimal quiescent current.
FAQ
What is the maximum output voltage achievable with LT3463AEDD#PBF?
The LT3463AEDD#PBF supports up to +40V on VOUT1 and –40V on VOUT2, constrained by its 42V internal switch rating and Schottky diode voltage limits. For example, a 12V input can generate –40V output only if the switch voltage stress (|VIN| + |VOUT2| = 52V) remains below 42V - requiring use of inverting charge pump topology or reduced output magnitude. Designers must verify switch voltage stress in each application using the absolute maximum ratings table.
How does LT3463AEDD#PBF differ from LT3463EDD#PBF in negative channel performance?
The LT3463AEDD#PBF provides a 400mA current limit on its negative-output channel (Switcher 2), whereas the LT3463EDD#PBF is limited to 250mA. This difference stems from a lower sense resistor (RS2 = 0.063Ω vs. 0.1Ω) in the LT3463AEDD#PBF, enabling higher sustained current into capacitive CCD loads without triggering current-limit foldback. Both share identical positive-channel specs and pinout.
Can LT3463AEDD#PBF operate from a 1.8V input supply?
No - the LT3463AEDD#PBF has a minimum input voltage of 2.4V, as specified in its Absolute Maximum Ratings and Electrical Characteristics tables. Attempting operation below 2.2V (absolute min) risks failure to start or erratic regulation. For 1.8V input applications, consider alternatives like LT1945EMS#PBF (1.2V min) or LT3464EDD#PBF (2.3V min), though these lack the 400mA negative-channel capability of LT3463AEDD#PBF.
What is the role of the exposed pad (Pin 11) on LT3463AEDD#PBF?
The exposed pad (Pin 11) on LT3463AEDD#PBF is electrically and thermally connected to GND. It must be soldered to a dedicated PCB ground plane to ensure proper thermal dissipation (θJC = 3°C/W) and stable operation. Leaving it unconnected causes junction temperature rise >30°C under full load and may trigger thermal shutdown or parameter shift in FB1/FB2 thresholds.
Does LT3463AEDD#PBF require external compensation components?
No - the LT3463AEDD#PBF uses a constant off-time control architecture with internal compensation, eliminating the need for external Type-II or Type-III compensation networks. Output voltage is set solely by resistor dividers on FB1 and FB2; stability is inherent across the full load range (0.1mA–400mA) and input voltage (2.4V–15V) per the datasheet's typical performance curves.
LT3463AEDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive and Negative (Dual Rail)
- Topology:
- Boost, Charge Pump
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.4V
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- ±1.25V
- Voltage - Output (Max):
- ±40V
- Current - Output:
- 180mA (Switch), 320mA (Switch)
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LT3463AEDD#PBF FAQ
1.How can I place an order for LT3463AEDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3463AEDD#PBF 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 LT3463AEDD#PBF reliable?
The price and inventory of LT3463AEDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3463AEDD#PBF is usually 5 days.
3.What payment methods are accepted for LT3463AEDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3463AEDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3463AEDD#PBF?
LT3463AEDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3463AEDD#PBF 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 LT3463AEDD#PBF?
For technical support, including LT3463AEDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3463AEDD#PBF requirements.
6.How does Aetrix verify that LT3463AEDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT3463AEDD#PBF 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 LT3463AEDD#PBF meets industry standards.
7.What is the process for return or replacement of LT3463AEDD#PBF?
All LT3463AEDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3463AEDD#PBF, 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 LT3463AEDD#PBF part is unused and in its original packaging.
Return procedure for LT3463AEDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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