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Analog Devices Inc. LTC3896EFE#PBF
- Part No.:
- LTC3896EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) 31 Leads, Exposed Pad
- Datasheet:
-
LTC3896EFE#PBF.pdf
- Description:
- IC REG CTRLR BUCK-BOOST 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:151
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Product details
Overview
LTC3896EFE#PBF 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 as low as –60V from inputs up to 140V (VIN + |VOUT–|). It features 40μA no-load quiescent current, ground-referenced RUN/PLLIN/PGOOD pins, and programmable switching frequency from 50kHz to 900kHz. It is used in telecom –48V distributed power systems requiring high input voltage tolerance and precise negative rail generation.
For engineers reviewing the LTC3896EFE#PBF datasheet, LTC3896EFE#PBF pinout, LTC3896EFE#PBF application, or LTC3896EFE#PBF equivalent, key selection criteria include its 150V absolute max input rating, –60V to –0.8V output range, true ground-referenced interface pins, OPTI-DRIVE gate drive programming, and 38-lead TSSOP high-voltage package with exposed VOUT– pad.
Technical Context
The LTC3896EFE#PBF implements a constant-frequency current-mode control architecture with phase-lockable oscillator (75–850kHz), enabling precise synchronization across multi-phase or cascaded converter systems. Its error amplifier (ITH node) directly controls peak inductor current via differential SENSE+ and SENSE– inputs, supporting accurate current limiting and transient response tuning via OPTI-LOOP compensation.
It integrates three independent LDO paths for DRVCC: internal VIN-based, external NMOS NDRV-based, and EXTVCC-based, with automatic switchover controlled by DRVUV and EXTVCC voltage thresholds. All control logic-including RUN, PLLIN, and PGOOD-is referenced to system GND, eliminating level-shifting components when interfacing with ground-referenced microcontrollers or supervisors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | VIN + |VOUT–| = 4V to 140V; supports wide-input industrial/telecom supplies without pre-regulation |
| Output Voltage Range | –60V to –0.8V; enables direct generation of standard negative rails like –48V, –24V, –12V, –5V, –3.3V |
| No-Load Quiescent Current | 40μA; extends battery runtime in always-on monitoring or backup systems |
| Switching Frequency Range | 50kHz to 900kHz (programmable); balances efficiency, size, and EMI in space-constrained designs |
| Feedback Reference Voltage | 0.800V ±0.008V (0°C to 85°C); ensures tight output regulation across temperature and load |
| Gate Drive Voltage Range | 5V to 10V (OPTI-DRIVE via DRVSET); optimizes RDS(on) and switching loss for diverse N-MOSFETs |
| Operating Junction Temp | –40°C to 125°C (E-grade); qualified for industrial and automotive under-hood environments |
Pinout & Package
Package: 38-lead plastic TSSOP (FE package) with exposed pad (Pin 39) soldered to PCB and electrically connected to VOUT– for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OVLO (1) | Overvoltage lockout input | Disables switching if voltage >1.2V w.r.t. VOUT–; protects downstream loads from overvoltage faults |
| VPRG (2) | Output voltage programming | Selects fixed –5V/–3.3V or adjustable mode; determines internal feedback divider configuration |
| SENSE+ / SENSE– (3,4) | Differential current sense inputs | Set peak current limit via external sense resistor; enable accurate cycle-by-cycle current protection |
| SS (5) | Soft-start control | Internal 10μA pull-up ramps VFB to final setpoint; also enables Regulator Shutdown (REGSD) feature |
| VFB (6) | Feedback input | Compares remote-sensed output to 0.8V reference; closed-loop regulation point for output voltage |
| ITH (7) | Error amplifier output | Directly sets current comparator threshold; primary compensation node for loop stability |
| MODE (8) | Light-load operation mode select | Configures Burst Mode®, pulse-skipping, or forced continuous conduction for efficiency optimization |
| VOUT– (9,10,15,39) | Negative output terminal / virtual ground | Reference for most internal circuits; exposed pad (39) must be soldered for rated thermal performance |
| CLKOUT (11) | Synchronization clock output | Provides phase-aligned clock signal for daisy-chaining additional controllers or drivers |
| GND (12) | System ground reference | True ground connection for RUN, PLLIN, PGOOD; enables direct interface with ground-referenced logic |
| PLLIN (13) | External sync input | Accepts ground-referenced clock (75–850kHz); locks TG edge to external timing source without level shifters |
| PGOOD (14) | Power good indicator | Open-drain output pulled to GND if VFB deviates >±10% from setpoint; signals valid output regulation |
| FREQ (17) | Frequency programming | Resistor-to-VOUT– sets VCO frequency; internal 20μA pull-up enables simple resistor-based programming |
| DRVSET (18) | DRVCC regulation setpoint | Programs gate drive voltage (5–10V) via resistor divider; optimizes MOSFET turn-on speed and conduction loss |
| DRVUV (19) | DRVCC UVLO threshold select | Chooses low/high UVLO thresholds (4.2V/7.8V) and EXTVCC switchover points (4.7V/7.7V) |
| TG (20) | Top gate driver output | Floating high-side driver with swing = DRVCC superimposed on SW node; drives N-MOSFET gate |
| SW (21) | Switch node | Connection to inductor and MOSFET bridge; carries high dv/dt switching waveform |
| BOOST (22) | Bootstrap supply | Capacitor between BOOST and SW provides floating supply for TG driver; enables high-side N-MOSFET drive |
| BG (24) | Bottom gate driver output | Ground-referenced driver swinging from VOUT– to DRVCC; drives synchronous rectifier N-MOSFET |
| DRVCC (26) | Gate driver supply | Output of internal/external LDOs; powers TG/BG drivers; requires ≥4.7µF ceramic decoupling to VOUT– |
| NDRV (28) | External NMOS gate driver | Drives gate of external NFET for high-current DRVCC LDO; disabled when tied to DRVCC |
| VIN (30) | Main input supply | Primary power source for INTVCC LDO and internal circuitry; bypassed to GND and VOUT– |
| EXTVCC (32) | External DRVCC supply input | Enables higher-efficiency DRVCC sourcing from output rail; auto-switchover avoids VIN-based losses |
| RUN (34) | Enable/disable control | Ground-referenced logic input; <1.12V disables switching, <0.7V reduces IQ to 10μA shutdown state |
| PHASMD (36) | CLKOUT phase select | Configures CLKOUT phase offset (0° or 90°) relative to TG for multi-phase interleaving |
Key Features
| Feature | Design Value |
|---|---|
| True ground-referenced RUN/PLLIN/PGOOD | Eliminates external level shifters when interfacing with MCU GPIOs or supervisors referenced to system GND |
| OPTI-DRIVE gate voltage programming | Adjusts DRVCC from 5V to 10V via single resistor, optimizing RDS(on) and switching loss for specific MOSFETs |
| Three-source DRVCC LDO architecture | Supports flexible power delivery: internal VIN LDO, external NMOS NDRV LDO, or EXTVCC LDO-auto-selected for efficiency |
| Integrated bootstrap diode | Reduces external component count in bootstrap circuit; simplifies layout and improves reliability vs discrete diodes |
| Programmable light-load operation modes | Enables Burst Mode®, pulse-skipping, or forced continuous conduction-selectable per application efficiency requirements |
| 150V absolute maximum input rating | Withstands transients and surges in harsh industrial/telecom environments without external clamping |
Applications
| Telecom –48V Power Supply | Industrial Negative Rail Generation |
|---|---|
Use Scenario: Generating –48V at 2A from 36–72V DC input in telecom line cards and base station power modules. IC Role / Device Role / Timing Role: Primary inverting controller managing synchronous N-MOSFET stage, current sensing, soft-start, and power-good signaling. Use Value: Delivers >90% efficiency at full load with 40μA quiescent current in standby, meeting GR-1089-CORE surge immunity and efficiency mandates. | Use Scenario: Creating isolated –15V or –24V bias rails for op-amps, ADCs, and analog front-ends in factory automation PLCs. IC Role / Device Role / Timing Role: High-voltage inverting regulator with ground-referenced interfaces, enabling direct MCU control without isolation or level shifting. Use Value: Supports 140V (VIN + |VOUT–|) operation, allowing use with unregulated 100VDC industrial buses while maintaining tight ±1% output regulation. |
| Automotive Battery Monitoring Systems | Distributed Power Architecture Modules |
Use Scenario: Providing –5V or –3.3V for precision sensor signal conditioning in 12V/24V vehicle battery monitoring units. IC Role / Device Role / Timing Role: Inverting controller configured in fixed-output mode (VPRG tied to INTVCC/VOUT–), with integrated PGOOD for system health reporting. Use Value: 40μA IQ extends runtime during vehicle sleep mode; –40°C to 125°C rating ensures operation across under-hood temperature extremes. | Use Scenario: Building modular –12V or –24V intermediate bus converters in server rack power distribution units (PDUs). IC Role / Device Role / Timing Role: Synchronizable inverting controller (via PLLIN) enabling interleaved multi-phase operation for lower ripple and thermal spreading. Use Value: Phase-lockable 75–850kHz frequency allows precise timing alignment across multiple LTC3896EFE#PBF units, reducing input/output capacitor requirements. |
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 |
|---|---|---|---|
| LTC3895EFE#PBF | Non-synchronous version; uses external Schottky diode instead of bottom N-MOSFET drive (BG pin absent); lower efficiency at high load | Suitable where cost sensitivity outweighs efficiency needs; lacks synchronous rectification and associated gate drive complexity | Select LTC3895EFE#PBF only when diode conduction loss is acceptable and board space permits larger heat sink for diode |
| LT8330EMSE#PBF | Fixed 2MHz frequency; no PLLIN or phase control; no ground-referenced RUN/PGOOD; smaller 16-lead MSOP package | Better suited for compact, low-power –5V/–12V point-of-load applications; not rated for >60V |VOUT–| or >100V VIN + |VOUT–| | Choose LT8330EMSE#PBF for space-constrained designs below 1A output where 2MHz switching enables tiny magnetics |
Compared with LTC3895EFE#PBF and LT8330EMSE#PBF, the LTC3896EFE#PBF uniquely combines synchronous N-MOSFET drive, ground-referenced control pins, 150V absolute input rating, and phase-lockable frequency-making it the only option for high-efficiency, high-voltage, synchronized inverting conversion in telecom and industrial infrastructure.
Availability
LTC3896EFE#PBF is available at Aetrix Electronics and suitable for telecom power supplies, industrial negative rail generation, and automotive battery monitoring systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3896EFE#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for all Linear ICs including the LTC3896 series.
The LTC3896 belongs to Linear's high-voltage DC/DC controller product line, designed specifically for demanding industrial, telecom, and automotive applications requiring robust negative voltage generation with minimal external components and ground-referenced control interfaces.
FAQ
What is the maximum allowable input voltage for the LTC3896EFE#PBF?
The LTC3896EFE#PBF has an absolute maximum input supply voltage (VIN) rating of 150V. Its functional operating range is specified as VIN + |VOUT–| ≤ 140V - meaning the sum of the positive input voltage and the magnitude of the negative output voltage must not exceed 140V. For example, with VOUT– = –48V, VIN may range from 4V to 92V. Exceeding 150V risks permanent device damage.
How does the LTC3896EFE#PBF achieve ground-referenced control without level shifters?
The LTC3896EFE#PBF achieves ground-referenced control by internally referencing its RUN, PLLIN, and PGOOD pins to the system GND pin - not to VOUT–. This architecture allows direct connection to microcontroller GPIOs, supervisors, or logic circuits operating at 0V–5V relative to system ground, eliminating the need for external level-shifting components typically required in high-side or negative-rail controllers.
Can the LTC3896EFE#PBF generate fixed –5V or –3.3V outputs without external resistors?
Yes. The LTC3896EFE#PBF can generate fixed –5V or –3.3V outputs without external feedback resistors by configuring the VPRG pin: tie VPRG to INTVCC for –5V output or to VOUT– for –3.3V output. In these modes, the internal resistor divider sets the feedback ratio, and VFB must be connected to GND (the positive terminal of the negative output) to complete the regulation loop.
What is the purpose of the EXTVCC pin on the LTC3896EFE#PBF?
The EXTVCC pin on the LTC3896EFE#PBF provides an alternative input to the internal DRVCC LDO regulator. When EXTVCC exceeds its switchover threshold (4.7V or 7.7V depending on DRVUV setting), the IC automatically selects EXTVCC - rather than VIN or the NDRV LDO - to power the gate drivers. This improves efficiency by sourcing DRVCC from a lower-loss path, such as the output rail itself, especially in high-current or high-input-voltage applications.
Does the LTC3896EFE#PBF support synchronization with external clock sources?
Yes. The LTC3896EFE#PBF supports external synchronization via the PLLIN pin, which accepts a ground-referenced clock signal from 75kHz to 850kHz. When enabled, the internal phase-locked loop aligns the rising edge of the top gate (TG) signal to the rising edge of the external clock. This capability enables precise interleaving across multiple LTC3896EFE#PBF units or coordination with system clocks in distributed power architectures.
LTC3896EFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width) 31 Leads, Exposed Pad
- Packaging:
- Tube
- 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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LTC3896EFE#PBF FAQ
1.How can I place an order for LTC3896EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3896EFE#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 LTC3896EFE#PBF reliable?
The price and inventory of LTC3896EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3896EFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3896EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3896EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3896EFE#PBF?
LTC3896EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3896EFE#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 LTC3896EFE#PBF?
For technical support, including LTC3896EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3896EFE#PBF requirements.
6.How does Aetrix verify that LTC3896EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3896EFE#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 LTC3896EFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3896EFE#PBF?
All LTC3896EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3896EFE#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 LTC3896EFE#PBF part is unused and in its original packaging.
Return procedure for LTC3896EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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