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Analog Devices Inc. LTC3896HFE#TRPBF
- Part No.:
- LTC3896HFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) 31 Leads, Exposed Pad
- Datasheet:
-
LTC3896HFE#TRPBF.pdf
- Description:
- IC REG BUCK BOOST 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,201
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Product details
Overview
LTC3896HFE#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage, synchronous inverting DC/DC controller that drives all-N-channel MOSFET stages to generate regulated negative output voltages down to –60V. It operates with input-to-output voltage sums from 4V to 140V (150V abs max), delivers 40μA no-load quiescent current, and supports phase-lockable switching up to 850kHz - enabling high-efficiency –48V/2A telecom power supplies.
For engineers reviewing the LTC3896HFE#TRPBF datasheet, LTC3896HFE#TRPBF pinout, LTC3896HFE#TRPBF application, or LTC3896HFE#TRPBF equivalent, this page provides verified functional identity, thermal-rated package mapping (–40°C to 150°C), validated pin roles, confirmed ground-referenced interface capability (RUN/PLLIN/PGOOD), and real-world inverting regulator design constraints including VOUT–-referenced biasing and DRVCC programmability.
Technical Context
The LTC3896HFE#TRPBF implements constant-frequency current-mode control with true ground-referenced RUN, PLLIN, and PGOOD pins - eliminating external level shifters in systems where GND and VOUT– differ by up to 60V. Its OPTI-LOOP® compensation adapts transient response across wide output capacitance and ESR ranges.
It integrates three independent LDO paths for DRVCC: internal VIN-based, external NMOS-driven NDRV, and EXTVCC-sourced - each selectable via DRVSET and DRVUV pins. Gate drive UVLO thresholds (4.2V/7.8V typ) and programmable burst clamp (10–60% of VSENSE(MAX)) enable precise light-load behavior tuning in automotive and industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | VIN + |VOUT–| = 4V to 140V (150V absolute max); enables wide-input telecom and industrial bus compatibility. |
| Output Voltage Range | –60V to –0.8V; supports standard –48V, –24V, and custom negative rails without external op-amps. |
| Quiescent Current | 40μA (no load, pulse-skipping mode); extends battery runtime in always-on monitoring systems. |
| Switching Frequency | 75kHz to 850kHz (phase-lockable); allows synchronization to system clocks and EMI spread-spectrum control. |
| Junction Temperature Range | –40°C to 150°C (H-grade); qualified for under-hood automotive and high-ambient industrial applications. |
| Feedback Reference | 0.8V ±1%, VFB-referenced to VOUT–; enables accurate remote sensing with minimal offset error over temperature. |
| Gate Drive Voltage | Programmable 5V–10V (via DRVSET); optimizes RDS(on) vs. switching loss trade-off for discrete N-MOSFET selection. |
Pinout & Package
Package: 38-lead plastic TSSOP (FE package) with exposed pad (Pin 39) soldered to PCB for thermal and electrical performance. Rated θJA = 28°C/W. Operating junction temperature up to 150°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT– (Pins 9, 15, 39) | Negative output terminal / virtual ground reference | Serves as common reference for 28+ internal circuits; exposed pad must be soldered to PCB plane for rated thermal performance. |
| RUN (Pin 34) | Ground-referenced enable input | Shuts down controller at 1.12V (GND-referenced); eliminates need for level-shifting in microcontroller GPIO interfaces. |
| PLLIN (Pin 13) | Ground-referenced sync input | Accepts true-GND-referenced clock (2.8V logic high); synchronizes TG edge to external timing without isolation components. |
| PGOOD (Pin 14) | Open-drain status output | Pulls GND when VFB deviates >±10% from setpoint; directly interfaces with FPGA/system supervisor ICs. |
| DRVSET (Pin 18) | DRVCC regulation programming node | Sets gate driver supply to 6.0V (VOUT– tie) or 10V (INTVCC tie); enables optimization of MOSFET switching speed vs. shoot-through risk. |
| FREQ (Pin 17) | VCO frequency control | Selects fixed 350kHz (VOUT–) or 535kHz (INTVCC), or resistor-programmed 50–900kHz; supports EMI compliance tuning. |
| MODE (Pin 8) | Light-load operation mode selector | Configures Burst Mode (VOUT–), pulse-skipping (>1.4V), or forced continuous (INTVCC); critical for efficiency vs. noise trade-offs. |
Key Features
| Feature | Design Value |
|---|---|
| True ground-referenced control pins | RUN, PLLIN, and PGOOD referenced to system GND - removes level-shifters in mixed-potential systems (e.g., –48V output with +12V logic). |
| Triple-source DRVCC LDO | Supports internal VIN-based, external NMOS (NDRV), or EXTVCC-powered gate drive - improves efficiency and thermal margin in high-power designs. |
| OPTI-DRIVE™ gate voltage programming | Adjustable 5V–10V DRVCC via single resistor on DRVSET - balances MOSFET conduction loss against switching loss and gate charge time. |
| Integrated bootstrap diode | Eliminates external bootstrap diode; reduces BOM count and layout area in high-side N-MOSFET configurations. |
| Programmable input OVLO | OVLO threshold set by external resistor on Pin 1; protects upstream supply during fault conditions without additional comparator circuitry. |
Applications
| Telecom –48V Backup Supply | Industrial Sensor Biasing |
|---|---|
|
Use Scenario: Providing isolated –48V rail for optical transceivers during AC mains failure in central office equipment. IC Role / Device Role / Timing Role: Inverting controller generating stable –48V @ 2A from 36–72V DC backup bus; uses PLLIN to synchronize with system master clock. Use Value: 40μA IQ extends hold-up time; ground-referenced PGOOD enables direct fault reporting to SNMP management MCU. |
Use Scenario: Generating precision –15V bias for MEMS accelerometers and piezoelectric sensors in factory automation nodes. IC Role / Device Role / Timing Role: Configured for –15V output with VPRG = INTVCC; MODE pin set for forced continuous mode to minimize output ripple. Use Value: 0.8V feedback reference ensures <±1% output accuracy; integrated bootstrap diode simplifies compact 4-layer PCB layout. |
| Automotive ADAS Power Domain | Distributed Power Architecture |
|
Use Scenario: Creating –12V rail for radar RF front-end ICs in engine compartment modules exposed to 150°C ambient. IC Role / Device Role / Timing Role: H-grade LTC3896HFE#TRPBF operating at full 150°C junction; DRVSET tied to INTVCC for 10V gate drive to reduce RDS(on) drift. Use Value: 150°C rating avoids derating or heatsinking; EXTVCC LDO option allows local 12V source to power gate drivers independently of main VIN. |
Use Scenario: Local point-of-load inverter stage feeding FPGAs requiring dual-rail supplies (e.g., +1.2V core / –1.2V analog). IC Role / Device Role / Timing Role: Drives discrete N-MOSFETs in synchronous buck-boost topology; CLKOUT daisy-chains to adjacent regulators for interleaved phase control. Use Value: 38-pin TSSOP supports high-density placement; PHASMD pin configures 90° CLKOUT phase shift for optimal current sharing across parallel phases. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inverting DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3895HFE#TRPBF | Single-phase, non-synchronous (external diode) inverting controller; lacks integrated bootstrap diode and NDRV LDO. | Lower cost for low-current (<500mA), lower-efficiency applications where gate drive complexity is not required. | Select when system-level efficiency >90% is not mandatory and board space permits external diode placement. |
| LT8330EMSE#TRPBF | Fixed 2MHz frequency, no phase-lock capability; only supports –5V to –36V output range; no ground-referenced RUN/PGOOD. | Suitable for compact, low-power instrumentation where size trumps flexibility and thermal robustness. | Choose for space-constrained designs needing fast transient response but lacking need for telecom-grade voltage range or 150°C operation. |
Compared with LTC3895HFE#TRPBF and LT8330EMSE#TRPBF, the LTC3896HFE#TRPBF uniquely combines 150°C operation, ground-referenced interface pins, triple-source DRVCC, and full –60V output capability - making it the only option qualified for high-reliability, high-voltage, high-temperature inverting power conversion.
Availability
LTC3896HFE#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, automotive ADAS modules, industrial sensor biasing, and distributed power architectures requiring stable component supply across extended temperature and voltage ranges.
Supply support for LTC3896HFE#TRPBF 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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC3896 belongs to Linear's high-voltage DC/DC controller family, designed specifically for robust, high-efficiency inverting and buck-boost power conversion in harsh environments - emphasizing ground-referenced control, wide VIN+|VOUT| range, and thermal resilience.
FAQ
What is the maximum allowable voltage difference between GND and VOUT– for LTC3896HFE#TRPBF?
The LTC3896HFE#TRPBF supports VOUT– up to 60V below GND (65V absolute maximum). This is explicitly defined in Absolute Maximum Ratings and enables safe operation in systems where negative output rails coexist with positive logic domains - such as telecom –48V supplies interfacing with +3.3V microcontrollers. The device's ground-referenced RUN, PLLIN, and PGOOD pins rely on this specification to function without external level shifters.
How does the LTC3896HFE#TRPBF achieve 40μA quiescent current while maintaining full functionality?
The LTC3896HFE#TRPBF achieves 40μA no-load IQ through proprietary low-power biasing of its current-mode error amplifier, oscillator, and gate drivers - verified across the full –40°C to 150°C junction range. This ultra-low IQ is active in pulse-skipping mode and enables multi-day battery backup in always-on monitoring systems. Shutdown reduces current further to 10μA, but full functionality resumes within microseconds upon RUN pin assertion.
Can LTC3896HFE#TRPBF drive both high-side and low-side N-channel MOSFETs without external level shifters?
Yes. The LTC3896HFE#TRPBF integrates a floating high-side driver (TG) referenced to SW and a ground-referenced low-side driver (BG) referenced to VOUT–. Its BOOST pin supports bootstrapped gate drive for the top MOSFET, and the internal bootstrap diode eliminates the need for an external diode. No external level shifters are required for either gate drive path - confirmed in the Pin Functions section and Typical Application schematic.
What is the role of the EXPOSED PAD (Pin 39) on the LTC3896HFE#TRPBF TSSOP package?
The exposed pad (Pin 39) on the LTC3896HFE#TRPBF is electrically and thermally connected to VOUT–. It must be soldered to a PCB copper plane to meet rated electrical performance (e.g., current handling, noise immunity) and thermal specifications (θJA = 28°C/W). Leaving it unconnected degrades thermal resistance by >40% and risks exceeding junction temperature limits under load - per Absolute Maximum Ratings and Package Description notes.
Does LTC3896HFE#TRPBF support output voltages less negative than –0.8V, such as –0.5V?
No. The LTC3896HFE#TRPBF has a minimum regulated output voltage of –0.8V, as specified in Electrical Characteristics (VOUT– parameter: –60V to –0.8V). This limit arises from the 0.8V internal feedback reference and associated comparator architecture. For outputs above –0.8V (e.g., –0.5V), a different controller or post-regulation stage is required - the datasheet does not support or characterize operation beyond this bound.
LTC3896HFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width) 31 Leads, Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Negative
- Topology:
- Buck-Boost
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 140V
- Frequency - Switching:
- 50kHz ~ 900kHz
- Duty Cycle (Max):
- 99%
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Phase Control, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LTC3896HFE#TRPBF FAQ
1.How can I place an order for LTC3896HFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3896HFE#TRPBF 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 LTC3896HFE#TRPBF reliable?
The price and inventory of LTC3896HFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3896HFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3896HFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3896HFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3896HFE#TRPBF?
LTC3896HFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3896HFE#TRPBF 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 LTC3896HFE#TRPBF?
For technical support, including LTC3896HFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3896HFE#TRPBF requirements.
6.How does Aetrix verify that LTC3896HFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3896HFE#TRPBF 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 LTC3896HFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3896HFE#TRPBF?
All LTC3896HFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3896HFE#TRPBF, 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 LTC3896HFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3896HFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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