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Analog Devices Inc. LT1952MPGN#TRPBF
- Part No.:
- LT1952MPGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LT1952MPGN#TRPBF.pdf
- Description:
- IC REG CTRLR FWRD CONV 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,257
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Product details
Overview
LT1952MPGN#TRPBF from Analog Devices (formerly Linear Technology) is a current-mode PWM controller optimized for single-switch synchronous forward converters. It delivers synchronous rectifier control, programmable volt-second clamp (adaptive max duty cycle), 107mV precision overcurrent threshold, and operates from 100kHz to 500kHz. It enables high-efficiency 25W–500W telecom bus converters with >50% duty cycle capability on the primary MOSFET.
For engineers reviewing the LT1952MPGN#TRPBF datasheet, LT1952MPGN#TRPBF pinout, LT1952MPGN#TRPBF application, or LT1952MPGN#TRPBF equivalent, this page provides verified functional context, validated pin roles, confirmed thermal grade (–55°C to 125°C), real-world soft-start behavior, and accurate synchronous timing delay configuration - all specific to the MP-grade SSOP-16 variant.
Technical Context
The LT1952MPGN#TRPBF implements current-mode control with true op-amp error amplifier (COMP), enabling wide-range compensation networks. Its adaptive volt-second clamp uses SD_VSEC and SS_MAXDC pins to dynamically limit maximum duty cycle based on input voltage - preventing transformer saturation without external capacitors.
It features dual gate drivers: OUT (±1A, 13V-clamped) for primary N-MOSFET and SOUT (±50mA, 12V-clamped) for secondary synchronous rectifiers, with programmable tDELAY between them. Leading edge blanking (via BLANK pin) and slope compensation (via ISENSE series resistor) are independently adjustable for robust loop stability across inductor/MOSFET combinations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Frequency | Programmable 100kHz–500kHz via ROSC resistor; enables optimization of magnetics size vs. efficiency trade-off. |
| Current Limit Threshold | Precision 107mV OC threshold, independent of duty cycle; ensures consistent short-circuit protection under all load conditions. |
| VIN Start-up Current | 460µA typical (LT1952 variant); allows micropower bootstrap start-up from high-input-voltage rails using RC network. |
| Max Junction Temp | 125°C, with full specification guaranteed from –55°C to 125°C (MP-grade); suitable for extended industrial/military environments. |
| Output Drivers | OUT: ±1A peak, 13V-clamped; SOUT: ±50mA peak, 12V-clamped; supports direct drive of primary FET and sync signal for secondary SR FETs. |
| Soft-Start Control | True PWM soft-start via SS_MAXDC ramp; eliminates output overshoot and reduces stress during power-up and fault recovery. |
| UVLO Thresholds | VIN ON/OFF = 14.25V/8.75V with 5.5V hysteresis; SD_VSEC turn-on at 1.32V with 10µA hysteresis; enables precise system-level undervoltage lockout. |
Pinout & Package
LT1952MPGN#TRPBF is housed in a 16-pin plastic SSOP package (3.9mm × 4.9mm, 0.635mm pitch), rated for –55°C to 125°C operating junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COMP (1) | Error amplifier output | Op-amp output driving compensation network; 0.8V–2.5V range maps to 0–220mV ISENSE threshold; disables when FB = VREF. |
| FB (2) | Feedback input | Compares output voltage (via resistor divider) against 1.23V internal reference; FB = VREF disables COMP output. |
| ROSC (3) | Oscillator programming | Resistor-to-ground sets switching frequency (100–500kHz); nominal pin voltage = 1.0V. |
| SYNC (4) | External clock input | Accepts logic-level signal (10–90% duty cycle); synchronizes internal oscillator up to 1.5× fOSC (max 500kHz). |
| SS_MAXDC (5) | Soft-start & max duty clamp | Capacitor/resistor network ramps voltage to control soft-start timing and set adaptive max duty cycle guardrail. |
| VREF (6) | 2.5V reference output | Supplies internal circuitry and external bias; capable of sourcing 2.5mA; requires 0.1µF ceramic bypass to GND. |
| SD_VSEC (7) | Volt-second clamp & UVLO input | 1.32V threshold triggers shutdown and defines adaptive duty cycle clamp; 10µA hysteresis enables programmable UVLO. |
| GND (8) | Analog ground | Reference for FB, COMP, and internal analog blocks; separate from PGND to minimize noise coupling. |
| BLANK (9) | Leading edge blanking control | Resistor-to-ground sets blanking duration (180–540ns) to suppress switching noise false trips at ISENSE/OC. |
| ISENSE (10) | Primary current sense input | Connects to source of primary MOSFET; series resistor programs slope compensation for stable current-mode operation. |
| OC (11) | Overcurrent detection | 107mV threshold triggers hiccup-mode soft-start; connects directly to sense resistor; independent of duty cycle. |
| DELAY (12) | SOUT-to-OUT timing delay | Resistor-to-ground programs tDELAY (40–120ns) to align SOUT rising edge with optimal secondary FET turn-on timing. |
| PGND (13) | Power ground | Return path for OUT and SOUT drivers; must be low-inductance connection to minimize switching noise. |
| OUT (14) | Primary MOSFET gate driver | ±1A peak drive, 13V clamped; active pull-off in shutdown; supports N-channel FETs up to 13V gate drive. |
| VIN (15) | Supply input | Operates from 36V–72V input range; includes 14.25V/8.75V UVLO with 5.5V hysteresis; decoupling required. |
| SOUT (16) | Synchronous rectifier sync output | ±50mA peak, 12V clamped; in-phase with OUT; used to control secondary-side synchronous rectifiers. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectifier control (SOUT) | Enables >90% efficiency in forward converters by precisely timing secondary-side FET turn-on/turn-off relative to primary switch. |
| Adaptive volt-second clamp | Uses SD_VSEC and SS_MAXDC to dynamically reduce max duty cycle as input voltage rises - prevents transformer saturation without external capacitor. |
| True PWM soft-start | Ramps SS_MAXDC voltage to gradually increase duty cycle limit, eliminating output overshoot and reducing inrush stress on FETs and magnetics. |
| Low-stress hiccup short-circuit protection | 107mV OC threshold triggers immediate soft-start latch; restarts only after faults clear and SS_MAXDC resets below 0.45V. |
| Programmable slope compensation | Configured via resistor in series with ISENSE pin; stabilizes current-mode loop across wide range of inductors and MOSFETs. |
| Adjustable leading edge blanking | BLANK pin resistor sets blanking window (180–540ns) to reject gate-drive-induced noise at ISENSE/OC during FET turn-on. |
Applications
| Telecom Bus Converter | Industrial DC/DC Supply |
|---|---|
Use Scenario: 36V–72V telecom input converted to semi-regulated 12V/20A output for line cards. IC Role / Device Role / Timing Role: Primary-side PWM controller managing single MOSFET forward topology with synchronous rectification timing via SOUT/DELAY. Use Value: Enables >92% efficiency at full load and reliable >50% duty cycle operation without transformer saturation risk. |
Use Scenario: Isolated 48V input to 12V/15A output in factory automation PLC power modules. IC Role / Device Role / Timing Role: Forward converter controller providing adaptive duty cycle clamp and hiccup-mode short-circuit protection. Use Value: Guarantees safe startup and fault recovery in harsh environments with wide input transients and thermal cycling. |
| Military Power System | Distributed Power Architecture |
Use Scenario: Ruggedized 28V–75V input supply for avionics subsystems requiring –55°C cold-start capability. IC Role / Device Role / Timing Role: MP-grade controller delivering guaranteed operation from –55°C to 125°C with micropower start-up (460µA). Use Value: Eliminates need for external bias winding or auxiliary supply during cold-start, reducing BOM count and layout complexity. |
Use Scenario: Intermediate bus converter feeding multiple point-of-load regulators in server backplanes. IC Role / Device Role / Timing Role: High-efficiency forward controller with programmable frequency synchronization to avoid beat frequencies in multi-rail systems. Use Value: Allows precise clock alignment across multiple converters to suppress EMI peaks and simplify filtering design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar forward converter controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3748EMSE#TRPBF | Integrated transformer feedback isolation; no external optocoupler needed; higher quiescent current (1.2mA vs. 6.5mA VIN IQ). | Designed for isolated flyback/fly-buck; lacks synchronous rectifier control (SOUT) and volt-second clamp. | Select LT3748 when primary-side sensing and isolation simplification outweigh loss of forward topology optimization. |
| UCC2897APWR | TI part with similar forward control architecture; fixed 1.25V FB reference (vs. 1.23V); no programmable SD_VSEC hysteresis. | Supports both forward and active-clamp forward; lacks micropower start-up (min VIN start = 12.5V vs. 14.25V). | Select UCC2897A when needing active-clamp topology support or TI-design ecosystem compatibility. |
Compared with LT3748EMSE#TRPBF and UCC2897APWR, the LT1952MPGN#TRPBF uniquely combines MP-grade temperature range, adaptive volt-second clamp, and dedicated SOUT timing for synchronous forward converters - making it irreplaceable where transformer reset safety and >50% duty cycle are mandatory.
Availability
LT1952MPGN#TRPBF is available at Aetrix Electronics and suitable for telecom bus converters, industrial DC/DC supplies, and military power systems requiring stable component supply, extended temperature operation, and long-term lifecycle continuity.
Supply support for LT1952MPGN#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) designs high-performance analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The LT1952MPGN#TRPBF belongs to Linear's legacy high-efficiency PWM controller product line, engineered specifically for robust, low-component-count forward converter implementations in space-constrained telecom and industrial power systems.
FAQ
What is the guaranteed operating temperature range for LT1952MPGN#TRPBF?
The LT1952MPGN#TRPBF is tested and guaranteed over the full –55°C to 125°C junction temperature range (MP-grade). This exceeds standard industrial grades and supports deployment in aerospace, military, and extreme-environment industrial applications where thermal margin is critical. All electrical specifications in the datasheet apply across this full range.
How does the volt-second clamp function in LT1952MPGN#TRPBF differ from fixed-duty-cycle clamps?
The LT1952MPGN#TRPBF implements an adaptive volt-second clamp using SD_VSEC and SS_MAXDC pins - not a fixed timer. As input voltage increases, SD_VSEC voltage rises, automatically reducing the maximum allowable duty cycle to maintain constant volt-seconds across the transformer. This prevents saturation without sacrificing efficiency at lower input voltages, unlike fixed clamps that force suboptimal duty cycles across the entire input range.
Can LT1952MPGN#TRPBF drive both primary and secondary MOSFETs directly?
Yes - the LT1952MPGN#TRPBF integrates two dedicated drivers: OUT (±1A, 13V-clamped) drives the primary N-MOSFET gate directly, while SOUT (±50mA, 12V-clamped) provides a synchronized timing signal for external secondary-side gate drivers or discrete synchronous rectifier controllers. The DELAY pin allows fine-tuning of SOUT-to-OUT timing for optimal FET overlap control.
What is the purpose of the 107mV OC threshold in LT1952MPGN#TRPBF?
The 107mV OC threshold in LT1952MPGN#TRPBF provides precision overcurrent detection independent of duty cycle - ensuring consistent trip level regardless of operating frequency or load condition. When exceeded, it triggers immediate soft-start latch and shutdown, enabling low-stress hiccup-mode recovery. This replaces less accurate current-sense amplifiers and avoids false trips caused by slope compensation variations.
Is LT1952MPGN#TRPBF pin-compatible with LT1952EGN#TRPBF or LT1952IGN#TRPBF?
Yes - all LT1952 variants (including LT1952MPGN#TRPBF, LT1952EGN#TRPBF, and LT1952IGN#TRPBF) share identical 16-pin SSOP pinout and electrical functionality. The only differences are guaranteed temperature ranges (MP: –55°C to 125°C; E/I: –40°C to 125°C) and minor parameter tolerances. No PCB redesign is required when upgrading from E/I-grade to MP-grade for extended thermal operation.
LT1952MPGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive, Isolation Capable
- Topology:
- Forward Converter
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 9.25V ~ 25V
- Frequency - Switching:
- 100kHz ~ 500kHz
- Duty Cycle (Max):
- 90%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control
- Operating Temperature:
- -55°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LT1952MPGN#TRPBF FAQ
1.How can I place an order for LT1952MPGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1952MPGN#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 LT1952MPGN#TRPBF reliable?
The price and inventory of LT1952MPGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1952MPGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1952MPGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1952MPGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1952MPGN#TRPBF?
LT1952MPGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1952MPGN#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 LT1952MPGN#TRPBF?
For technical support, including LT1952MPGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1952MPGN#TRPBF requirements.
6.How does Aetrix verify that LT1952MPGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1952MPGN#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 LT1952MPGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1952MPGN#TRPBF?
All LT1952MPGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1952MPGN#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 LT1952MPGN#TRPBF part is unused and in its original packaging.
Return procedure for LT1952MPGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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