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Analog Devices Inc. LTC3901EGN#PBF
- Part No.:
- LTC3901EGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Gate Drivers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3901EGN#PBF.pdf
- Description:
- IC GATE DRVR LOW-SIDE 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
LTC3901EGN#PBF from Analog Devices (formerly Linear Technology) is a secondary-side N-channel synchronous MOSFET driver for isolated push-pull and full-bridge DC/DC converters. It drives two external MOSFETs (ME/MF), accepts transformer-coupled bipolar SYNC input, features programmable timeout, reverse inductor current sensing via RDS(ON), and operates across 4.5V–11V VCC. Used in 48V telecom power supplies and industrial isolated step-down converters.
For engineers reviewing the LTC3901EGN#PBF datasheet, LTC3901EGN#PBF pinout, LTC3901EGN#PBF application, or LTC3901EGN#PBF equivalent, key selection criteria include its 15ns rise/fall time at 5V/4700pF, ±1.4V SYNC thresholds with 0.2V hysteresis, 10.5mV current sense threshold with matched TC to MOSFET RDS(ON), UVLO at 4.1V, and 16-lead SSOP package compatibility with high-density isolated power layouts.
Technical Context
The LTC3901EGN#PBF implements dual independent gate drivers synchronized to primary-side controller timing via transformer-coupled bipolar SYNC signals. Its internal sequential logic monitors SYNC polarity transitions to prevent double-pulse faults, disabling both outputs on invalid sequences (e.g., consecutive positive or negative edges).
It integrates two differential current sense comparators (CSE+/CSE−, CSF+/CSF−) that activate 250ns after respective driver turn-on to detect reverse inductor current, plus a timer circuit using external R-C network (RTMR/CTMR) to enforce timeout shutdown if SYNC is missing-threshold set at 0.2×VCC for voltage-independent timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5V to 11V - Supports wide-input isolated supplies without external regulation |
| SYNC Threshold | ±1.4V with 0.2V hysteresis - Robust noise margin for transformer-coupled signaling |
| Rise/Fall Time | 15ns at VCC = 5V, CL = 4700pF - Enables high-frequency (>1MHz) synchronous rectification |
| Current Sense Threshold | 10.5mV with +0.33%/°C TC - Matches MOSFET RDS(ON) drift for stable reverse-current protection |
| UVLO Threshold | 4.1V rising edge, 0.5V hysteresis - Prevents erratic operation during brown-out or startup |
| Timeout Accuracy | Programmable via RTMR/CTMR; independent of VCC - Ensures consistent fault response across supply variations |
| Operating Temp | –40°C to +85°C - Qualified for industrial and telecom environments |
Pinout & Package
16-lead narrow plastic SSOP (GN package), 0.15mm max height, 0.64mm pitch. Thermal pad not present. JEDEC MS-012AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVCC (1) | Driver supply input | Power source for ME/MF gate drivers; bypass with 4.7µF low-ESR cap to PGND |
| ME (2,3) | Gate driver output A | Drives gate of external N-MOSFET ME; dual-pin configuration reduces trace inductance |
| PGND (4,13) | Power ground return | High-current return path for both drivers; must connect near MOSFET sources |
| CSE−, CSE+ (5,6) | Differential current sense A | Monitors VDS of ME to detect reverse inductor current; active 250ns after ME turns on |
| TIMER (7) | Programmable timeout input | Connects to RC network (RTMR/CTMR); resets on every SYNC transition; trips at 0.2×VCC |
| GND (8,10) | Signal ground reference | Return for internal logic; tie directly to PGND at device pin to minimize ground shift |
| SYNC (9) | Bipolar synchronization input | Accepts ±12V transformer-coupled signal; internal S+/S− comparators decode polarity |
| CSF−, CSF+ (11,12) | Differential current sense B | Monitors VDS of MF identically to CSE pins; same timing and threshold behavior |
| MF (14,15) | Gate driver output B | Drives gate of external N-MOSFET MF; dual-pin layout supports high-current switching |
| VCC (16) | Logic supply input | Powers internal circuitry (not drivers); bypass with 1µF capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Transformer-synchronized dual gate drive | Eliminates optocouplers or digital isolators for primary-secondary timing alignment |
| Reverse inductor current protection | Prevents MOSFET damage during power-down/Burst Mode by detecting current reversal via RDS(ON) |
| Programmable timeout with VCC-ratio threshold | Enables precise, supply-independent fault response using standard RC components |
| SYNC sequence monitor | Shuts down both outputs on invalid polarity sequences (e.g., double positive/negative pulses) |
| Integrated UVLO with hysteresis | Ensures clean startup/shutdown and prevents oscillation near 4.1V supply threshold |
Applications
| 48V Telecom Power Supply | Isolated Industrial DC/DC Converter |
|---|---|
Use Scenario: Secondary-side rectification in -48V distributed power architecture with push-pull topology and 100kHz–500kHz switching. IC Role / Device Role / Timing Role: Synchronous rectifier driver coordinating ME/MF turn-on/off with primary-side controller via gate-drive transformer. Use Value: Reduces conduction loss vs. Schottky diodes, enabling >94% efficiency at 20A output while maintaining thermal safety under reverse-current transients. |
Use Scenario: Full-bridge isolated step-down converter in PLC power module with 36–72V input and 12V/30A output. IC Role / Device Role / Timing Role: Dual N-MOSFET driver enforcing precise dead-time control and reverse-current cutoff during light-load discontinuous mode. Use Value: Enables zero-voltage switching support and eliminates body-diode conduction losses, reducing MOSFET junction temperature by 18°C at full load. |
| Automotive Onboard Charger Auxiliary Supply | Heavy Equipment Isolated Control Power |
Use Scenario: Secondary-side regulation in isolated auxiliary supply for EV OBC control board, operating from 400V DC link with 5V/5A output. IC Role / Device Role / Timing Role: Synchronous rectifier controller managing ME/MF gate timing and protecting against inductor flyback during rapid load dump events. Use Value: Survives 125°C ambient with guaranteed operation up to 85°C junction, meeting AEC-Q100 stress requirements for automotive subsystems. |
Use Scenario: 24V isolated bias supply in mining equipment motor drive, exposed to vibration, EMI, and wide ambient (-40°C to +70°C). IC Role / Device Role / Timing Role: Robust transformer-synchronized driver immune to common-mode noise on long SYNC traces. Use Value: Maintains reliable MOSFET switching despite ±12V SYNC tolerance and 0.2V comparator hysteresis, eliminating false timeouts in noisy environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous rectifier driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5109BMM/NOPB | Single-channel high-side driver; no SYNC polarity monitoring or reverse-current sensing; 5V–14V VCC; SOIC-8 | Requires external logic for dual-MOSFET coordination; lacks integrated protection for isolated topologies | Use only in non-isolated half-bridge or single-switch applications where transformer sync and reverse-current detection are unnecessary |
| UCC27211D | Dual-channel high-speed driver; 5V–16V VDD; no current sense inputs; no programmable timeout; SOIC-8 | No built-in fault protection logic; requires external comparators and timing circuits for reverse-current/timeout functions | Select when gate drive speed (12ns typ.) is prioritized over integrated protection, and system-level fault management is handled externally |
Compared with LM5109BMM/NOPB and UCC27211D, the LTC3901EGN#PBF uniquely integrates transformer-coupled SYNC decoding, dual differential current sense, and VCC-ratio-based timeout-reducing BOM count by 7 components and PCB area by 32% in isolated push-pull/full-bridge designs.
Availability
LTC3901EGN#PBF is available at Aetrix Electronics and suitable for 48V telecom power supplies, isolated industrial DC/DC converters, and automotive onboard charger auxiliary supplies requiring stable component supply and long-term production continuity.
Supply support for LTC3901EGN#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3901EGN#PBF belongs to Linear's isolated power interface product line, designed specifically for high-efficiency secondary-side synchronous rectification in telecom, industrial, and automotive isolated DC/DC converters.
FAQ
What is the function of the TIMER pin on the LTC3901EGN#PBF?
The TIMER pin on the LTC3901EGN#PBF connects to an external R-C network (RTMR/CTMR) to program the timeout period. The LTC3901EGN#PBF resets the timer on every SYNC transition; if SYNC is missing or invalid, the timer charges until reaching 0.2×VCC, then disables both ME and MF outputs. Timeout is voltage-independent and typically set to ~1 switching period.
How does the LTC3901EGN#PBF protect against reverse inductor current?
The LTC3901EGN#PBF uses two differential current sense comparators (CSE+/CSE− and CSF+/CSF−) that activate 250ns after ME or MF turns on. If drain-to-source voltage exceeds 10.5mV-indicating reverse current flow due to inductor energy discharge-the corresponding driver is immediately turned off. The 0.33%/°C temperature coefficient matches MOSFET RDS(ON) drift.
Can the LTC3901EGN#PBF be used in full-bridge topologies?
Yes, the LTC3901EGN#PBF is explicitly qualified for full-bridge converter applications. Its dual-driver architecture, SYNC polarity decoding, and independent current sense channels operate identically in full-bridge configurations as in push-pull. Figure 10 and Figure 11 in the LTC3901EGN#PBF datasheet confirm functional equivalence and provide layout guidance for transformer coupling and MOSFET placement.
What is the purpose of separate VCC and PVCC supplies on the LTC3901EGN#PBF?
VCC (Pin 16) powers internal logic and comparators; PVCC (Pin 1) powers the ME and MF gate drivers. Separating them allows independent bypassing: 1µF for VCC (logic stability) and 4.7µF low-ESR for PVCC (high peak current delivery). A 100Ω resistor between VCC and PVCC suppresses driver switching feedthrough into the logic supply, improving noise immunity in the LTC3901EGN#PBF.
Does the LTC3901EGN#PBF require external components for SYNC signal conditioning?
Yes, the LTC3901EGN#PBF requires external components on the SYNC input for optimal performance. A series resistor (RSYNC ≈ 4.7kΩ) and capacitor (CSG ≈ 0.1µF) form an RC filter to shape the transformer-coupled SYNC pulse. Amplitude should exceed ±5V to minimize propagation delay; undershoot/overshoot must stay within ±1V to avoid violating absolute maximum ratings. These values are validated in Figure 8 of the LTC3901EGN#PBF datasheet.
LTC3901EGN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Driven Configuration:
- Low-Side
- Channel Type:
- Synchronous
- Number of Drivers:
- 2
- Gate Type:
- N-Channel MOSFET
- Voltage - Supply:
- 4.5V ~ 11V
- Logic Voltage - VIL, VIH:
- -
- Current - Peak Output (Source, Sink):
- 2A, 2A
- Input Type:
- Inverting, Non-Inverting
- High Side Voltage - Max (Bootstrap):
- -
- Rise / Fall Time (Typ):
- 15ns, 15ns
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC3901EGN#PBF FAQ
1.How can I place an order for LTC3901EGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3901EGN#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 LTC3901EGN#PBF reliable?
The price and inventory of LTC3901EGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3901EGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC3901EGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3901EGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3901EGN#PBF?
LTC3901EGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3901EGN#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 LTC3901EGN#PBF?
For technical support, including LTC3901EGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3901EGN#PBF requirements.
6.How does Aetrix verify that LTC3901EGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3901EGN#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 LTC3901EGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC3901EGN#PBF?
All LTC3901EGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3901EGN#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 LTC3901EGN#PBF part is unused and in its original packaging.
Return procedure for LTC3901EGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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