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Analog Devices Inc. LTC3896IFE#PBF
- Part No.:
- LTC3896IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) 31 Leads, Exposed Pad
- Datasheet:
-
LTC3896IFE#PBF.pdf
- Description:
- IC REG CTRLR BUCK-BOOST 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,175
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Product details
Overview
LTC3896IFE#PBF from Analog Devices (formerly Linear Technology) is a high-performance, 150V absolute max input, synchronous inverting DC/DC controller that drives all-N-channel MOSFETs to generate regulated negative output voltages down to –60V. It operates from 4V to 140V input-to-output differential, delivers 40μA no-load quiescent current, and supports phase-lockable switching up to 850kHz - ideal for telecom –48V distributed power systems.
For engineers reviewing the LTC3896IFE#PBF datasheet, LTC3896IFE#PBF pinout, LTC3896IFE#PBF application, or LTC3896IFE#PBF equivalent, key selection criteria include ground-referenced RUN/PGOOD/PLLIN interface compatibility, OPTI-DRIVE programmable gate drive (5–10V), integrated bootstrap diode, and selectable light-load modes (Burst Mode®, pulse-skipping, forced continuous).
Technical Context
The LTC3896IFE#PBF implements a constant-frequency current-mode control architecture with true ground-referenced control pins (RUN, PLLIN, PGOOD), eliminating external level shifters. Its OPTI-LOOP® compensation adapts transient response across wide output capacitance and ESR ranges.
It integrates three independent LDO options for DRVCC: internal VIN-based, internal EXTVCC-based, or external NMOS-driven via NDRV - configurable via DRVSET (5–10V) and DRVUV (dual UVLO thresholds). The controller supports programmable frequency (50–900kHz), phase synchronization (75–850kHz), and adjustable current limit via ILIM/VPRG.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 140V (VIN + |VOUT–|); supports wide-input industrial/telecom supplies without pre-regulation |
| Output Voltage Range | –0.8V to –60V; enables flexible negative rail generation including standard –48V and –5V/–3.3V fixed outputs |
| Quiescent Current | 40μA (no load); extends battery runtime in always-on monitoring or backup systems |
| Switching Frequency | Programmable 50–900kHz or phase-lockable 75–850kHz; balances efficiency, size, and EMI in dense layouts |
| Gate Drive Voltage | Adjustable 5–10V via DRVSET; optimizes RDS(on) and switching loss for diverse N-MOSFETs |
| Feedback Reference | Precision 0.8V (±1% over temp); ensures tight output regulation across temperature and load |
| Package | 38-Lead TSSOP with exposed VOUT– pad; provides thermal path for high-power inverting topologies |
Pinout & Package
38-Lead Plastic TSSOP (FE package) with exposed pad soldered to VOUT– for thermal and electrical performance. Pin 39 (exposed pad) is electrically connected to VOUT– and must be soldered to PCB copper for rated operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OVLO (1) | Overvoltage lockout input | Disables switching if voltage >1.2V w.r.t. VOUT–; soft-start resets on fault recovery |
| VPRG (2) | Output voltage programming select | Floating = adjustable –0.8V to –60V; tied to INTVCC/VOUT– = fixed –5V/–3.3V |
| SENSE+ (3), SENSE– (4) | Differential current sense inputs | Enable accurate peak-current-mode control; SENSE– powers comparator when >INTVCC |
| SS (5) | Soft-start and shutdown control | Internal 10μA pull-up sets ramp time; also enables Regulator Shutdown (REGSD) feature |
| VFB (6) | Feedback input | Compares against 0.8V reference; connects to GND in fixed-output mode |
| ITH (7) | Error amplifier output | Controls current limit threshold; used for loop compensation and slope compensation |
| MODE (8) | Light-load operation mode select | VOUT– = Burst Mode®; INTVCC = forced continuous; 0.5–1.0V = adjustable burst clamp |
| VOUT– (9,10,15,39) | Negative output return / virtual ground | Reference for most internal circuits; exposed pad (39) must be soldered for thermal integrity |
| CLKOUT (11) | Synchronization output | Drives daisy-chained controllers; swings INTVCC to VOUT– with 90° phase option via PHASMD |
| GND (12) | True system ground reference | Reference for RUN, PLLIN, PGOOD - enables direct interface with ground-referenced logic |
| PLLIN (13) | External clock input | Phase-locks TG edge to external rising clock; no level shifter needed due to GND reference |
| PGOOD (14) | Open-drain power-good indicator | Pulled low if VFB deviates >±10%; referenced to GND for direct MCU/ASIC interfacing |
| FREQ (17) | Frequency programming | VOUT– = ~350kHz; INTVCC = ~535kHz; resistor divider enables precise 50–900kHz setting |
| DRVSET (18) | DRVCC regulation setpoint | VOUT– = 6.0V; INTVCC = 10.0V; resistor to VOUT– programs 5–10V for optimal gate drive |
| DRVUV (19) | DRVCC UVLO threshold select | VOUT– = lower UVLO (4.0/3.6V); INTVCC = higher UVLO (7.8/6.7V); prevents false shutdown |
| TG (20) | Top N-MOSFET gate driver | Floating high-side driver; swing = DRVCC superimposed on SW node voltage |
| SW (21) | Switch node connection | Connects to inductor and BOOST capacitor; carries high dv/dt switching waveform |
| BOOST (22) | Bootstrap supply for TG | Capacitor between BOOST–SW provides floating bias for top gate driver |
| BG (24) | Bottom N-MOSFET gate driver | Ground-referenced driver; swing = VOUT– to DRVCC |
| DRVCC (26) | Gate driver supply output | Powered by VIN, EXTVCC, or external NMOS (NDRV); requires ≥4.7µF ceramic decoupling |
| NDRV (28) | External NMOS gate drive | Drives gate of external NFET for high-current DRVCC LDO; tie to DRVCC to disable |
| VIN (30) | Main input supply | Accepts 4–150V; bypassed to GND and VOUT– for noise suppression and stability |
| EXTVCC (32) | External DRVCC LDO input | Enables switchover to external supply (>4.7V or >7.7V w.r.t. VOUT–); max 14V |
| RUN (34) | Enable/shutdown control | 1.12V threshold for partial shutdown; <0.7V reduces IQ to 10μA; GND-referenced |
| PHASMD (36) | CLKOUT phase selector | VOUT– = CLKOUT 90° out-of-phase with TG; INTVCC = in-phase; enables multi-phase sync |
Key Features
| Feature | Design Value |
|---|---|
| Ground-referenced RUN/PLLIN/PGOOD | Eliminates level-shifting circuitry and associated BOM cost, layout complexity, and signal integrity risk |
| OPTI-DRIVE gate voltage programming | Enables optimization of switching loss vs. conduction loss across diverse MOSFET RDS(on) and Qg values |
| Integrated bootstrap diode | Reduces external component count and PCB area in high-side gate drive path |
| Three DRVCC LDO sources | Supports flexible power architecture: internal VIN, external EXTVCC, or high-current NMOS-based NDRV |
| Selectably optimized light-load operation | Choice of Burst Mode®, pulse-skipping, or forced continuous preserves efficiency across full load range |
| Programmable current limit and OVLO | Allows precise protection coordination with downstream components and system-level fault management |
Applications
| Telecom –48V Power Conversion | Industrial Negative Bias Supplies |
|---|---|
Use Scenario: Converting 36–72V DC input to regulated –48V/2A output in telecom line cards and remote radio units. IC Role / Device Role / Timing Role: Primary inverting controller managing synchronous N-MOSFETs, current sensing, and power-good signaling. Use Value: Delivers >90% efficiency at full load with 40μA quiescent current enabling low-power standby compliance. | Use Scenario: Generating –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 precision 0.8V feedback and ground-referenced interface for isolated control logic. Use Value: Eliminates need for discrete level shifters while supporting wide input (up to 140V differential) for unregulated industrial bus inputs. |
| Automotive Infotainment Display Bias | Test Equipment Negative Rails |
Use Scenario: Providing –5V and –3.3V fixed outputs for LCD panel source drivers and timing controllers in automotive head units. IC Role / Device Role / Timing Role: Configurable inverting controller using VPRG pin to select factory-programmed output voltages without external resistors. Use Value: Reduces BOM count and improves reliability by replacing multiple discrete regulators with single IC and fixed internal dividers. | Use Scenario: Delivering stable –60V/100mA negative supply for precision DACs and high-voltage op-amp test fixtures. IC Role / Device Role / Timing Role: High-accuracy inverting controller with ±1% VFB reference and programmable current limit for safe under-load testing. Use Value: Enables deep negative output capability with tight regulation (0.1% load regulation) and fast transient response via OPTI-LOOP®. |
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 |
|---|---|---|---|
| LTC3895IFE#PBF | Non-synchronous (external Schottky) topology; no bottom gate driver (BG); lower max |VOUT–| (–40V) | Suitable where cost sensitivity outweighs efficiency needs; limited to lower negative output magnitudes | Choose LTC3895IFE#PBF only if synchronous rectification is unnecessary and –40V output suffices |
| LTC3873EMS#PBF | Lower voltage rating (60V abs max); no ground-referenced PGOOD/PLLIN; fixed 0.8V ref but no OPTI-LOOP® | Targeted at lower-cost, lower-power industrial converters where interface simplicity is secondary to BOM cost | Choose LTC3873EMS#PBF only for ≤60V input designs lacking need for ground-referenced control or advanced compensation |
Compared with LTC3895IFE#PBF and LTC3873EMS#PBF, the LTC3896IFE#PBF uniquely combines 150V absolute input rating, synchronous N-MOSFET drive, ground-referenced interfaces, and OPTI-LOOP® - making it the only choice for high-efficiency, high-voltage, system-integrated inverting supplies requiring minimal external components and robust noise immunity.
Availability
LTC3896IFE#PBF is available at Aetrix Electronics and suitable for telecom power conversion, industrial negative bias generation, and automotive infotainment display applications requiring stable component supply, long-term lifecycle support, and guaranteed –40°C to +125°C operation.
Supply support for LTC3896IFE#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 the LTC portfolio.
The LTC3896IFE#PBF belongs to Linear's high-voltage DC/DC controller family, designed specifically for efficient, reliable, and compact negative-output power conversion in space-constrained, high-reliability systems.
FAQ
What is the maximum absolute input voltage rating for the LTC3896IFE#PBF?
The LTC3896IFE#PBF has an absolute maximum input supply voltage (VIN) rating of 150V. This rating applies to the voltage difference between VIN and VOUT–, not just VIN relative to GND. Operation beyond this limit risks permanent device damage per Absolute Maximum Ratings specifications.
Does the LTC3896IFE#PBF support true ground-referenced control signals?
Yes, the LTC3896IFE#PBF features true ground-referenced RUN, PLLIN, and PGOOD pins - all referenced to the GND pin, not VOUT–. This eliminates the need for external level-shifting components when interfacing with standard microcontrollers, FPGAs, or logic circuits operating with respect to system ground.
How is the output voltage programmed on the LTC3896IFE#PBF?
The LTC3896IFE#PBF supports three output programming methods: (1) Floating VPRG enables adjustable –0.8V to –60V via external resistor divider on VFB; (2) Tying VPRG to INTVCC sets fixed –5V output; (3) Tying VPRG to VOUT– sets fixed –3.3V output. In fixed-output mode, VFB must connect to GND.
What are the supported light-load operating modes for the LTC3896IFE#PBF?
The LTC3896IFE#PBF supports three selectable light-load modes via the MODE pin: Burst Mode® operation (pin = VOUT–), pulse-skipping mode (pin = 1.4–INTVCC–1.3V), and forced continuous conduction mode (pin = INTVCC). Each mode offers distinct trade-offs between light-load efficiency, output ripple, and EMI profile.
Can the LTC3896IFE#PBF drive external high-current MOSFETs?
Yes, the LTC3896IFE#PBF provides high-current gate drivers for both top (TG) and bottom (BG) N-channel MOSFETs, with typical pull-up/pull-down resistances of 2.2Ω/1.0Ω (TG) and 2.0Ω/1.0Ω (BG). It also supports external NMOS pass devices via NDRV for high-current DRVCC regulation, enabling scalable power delivery.
LTC3896IFE#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
LTC3896IFE#PBF FAQ
1.How can I place an order for LTC3896IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3896IFE#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 LTC3896IFE#PBF reliable?
The price and inventory of LTC3896IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3896IFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3896IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3896IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3896IFE#PBF?
LTC3896IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3896IFE#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 LTC3896IFE#PBF?
For technical support, including LTC3896IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3896IFE#PBF requirements.
6.How does Aetrix verify that LTC3896IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3896IFE#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 LTC3896IFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3896IFE#PBF?
All LTC3896IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3896IFE#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 LTC3896IFE#PBF part is unused and in its original packaging.
Return procedure for LTC3896IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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