My Inquiry
My Account
Analog Devices Inc. LT1952MPGN-1#TRPBF
- Part No.:
- LT1952MPGN-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LT1952MPGN-1#TRPBF.pdf
- Description:
- IC REG CTRLR FWRD CONV 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,488
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1952MPGN-1#TRPBF from Analog Devices (formerly Linear Technology) is a current-mode PWM controller optimized for single-switch synchronous forward converters, featuring programmable volt-second clamp, 107mV precision overcurrent threshold, and dual gate drivers (OUT ±1A, SOUT ±50mA). It operates from 36V–72V input to deliver up to 500W in telecom and industrial DC/DC supplies.
For engineers reviewing the LT1952MPGN-1#TRPBF datasheet, LT1952MPGN-1#TRPBF pinout, LT1952MPGN-1#TRPBF application, or LT1952MPGN-1#TRPBF equivalent, key selection criteria include its –55°C to 125°C extended temperature grade, adaptive duty cycle clamp for >50% operation, synchronous rectifier timing delay control, and low 400µA startup current enabling bootstrap start from low-input-voltage rails.
Technical Context
The LT1952MPGN-1#TRPBF implements current-mode control with true op-amp error amplifier (65–85dB open-loop gain, 3MHz unity-gain bandwidth), programmable slope compensation, and leading-edge blanking via external resistors on BLANK and DELAY pins. Its volt-second clamp uses SD_VSEC and SS_MAXDC resistor dividers-no capacitor required-to dynamically limit maximum duty cycle based on input voltage.
It supports 100kHz–500kHz programmable switching frequency (ROSC pin), synchronization to external clock up to 1.5×fOSC, and features hiccup-mode short-circuit protection triggered by OC ≥107mV. The MP-grade variant guarantees full –55°C to 125°C junction operation with validated electrical specs across that range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Input Voltage | 36V to 72V - Designed for high-voltage telecom bus converters requiring stable regulation under wide line variation. |
| Startup Current | 400µA - Enables micropower bootstrap start-up from low-voltage auxiliary windings or bias supplies. |
| Overcurrent Threshold | 107mV ±9mV - Precision, duty-cycle-independent trip point enabling reliable hiccup-mode short-circuit protection. |
| Switching Frequency Range | 100kHz to 500kHz - Programmable via ROSC resistor; supports optimization of magnetics size vs. efficiency trade-offs. |
| Output Drivers | OUT: ±1A peak, 13V clamp; SOUT: ±50mA peak, 12V clamp - Direct drive capability for primary MOSFET and secondary synchronous rectifiers. |
| Temperature Grade | –55°C to 125°C (MP-grade) - Fully tested and guaranteed performance across military/aerospace and harsh industrial environments. |
| Volt-Second Clamp | SD_VSEC threshold = 1.32V ±0.06V - Enables adaptive duty cycle limiting without external capacitor, preventing transformer saturation. |
Pinout & Package
LT1952MPGN-1#TRPBF is housed in a 16-pin plastic SSOP package (GN), 5.0mm × 6.2mm, 0.635mm pitch, with exposed pad for thermal enhancement. Pin 8 (GND) and Pin 13 (PGND) are separate analog and power ground terminals for noise isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COMP (1) | Error amplifier output | Drives feedback loop; 0.8V–2.5V range maps to 0–220mV ISENSE threshold; supports opto-coupler or direct compensation networks. |
| FB (2) | Feedback input | Compares output voltage divider against internal 1.226V reference; FB = VREF disables error amplifier. |
| ROSC (3) | Oscillator programming | Resistor-to-ground sets fOSC from 100kHz–500kHz; nominal pin voltage = 1.0V. |
| SYNC (4) | External clock input | Logic-compatible input accepting 10%–90% duty cycle signals up to 500kHz; enables system-level clock synchronization. |
| SS_MAXDC (5) | Soft-start & max duty clamp | Capacitor-resistor network ramps voltage to control soft-start timing and set adaptive duty cycle guardrail. |
| VREF (6) | 2.5V reference output | Sources up to 2.5mA; used to bias SS_MAXDC, SD_VSEC, and ROSC resistor dividers. |
| SD_VSEC (7) | Volt-second clamp / UVLO | 1.32V threshold triggers shutdown; resistor divider from VIN provides programmable undervoltage lockout with 10µA hysteresis. |
| GND (8) | Analog ground | Reference for COMP, FB, and internal circuitry; must be star-connected to minimize noise coupling. |
| BLANK (9) | Leading-edge blanking control | Resistor-to-ground programs blanking time (180–540ns) to suppress switching noise false trips at ISENSE/OC. |
| ISENSE (10) | Primary current sense input | Connects to source of primary MOSFET; slope compensation resistor in series adjusts loop stability. |
| OC (11) | Overcurrent detection | Direct connection to sense resistor; 107mV threshold triggers immediate soft-start latch and shutdown. |
| DELAY (12) | Synchronous rectifier timing | Resistor-to-ground programs tDELAY (40–120ns) between SOUT and OUT rising edges for optimal secondary-side FET timing. |
| PGND (13) | Power ground | Return path for OUT and SOUT drivers; must be low-inductance connection to MOSFET source. |
| OUT (14) | Primary MOSFET gate driver | ±1A peak drive, 13V clamp; active pull-off in shutdown prevents shoot-through during fault recovery. |
| VIN (15) | Supply input | Operates from 36V–72V; LT1952MPGN-1#TRPBF has VIN ON = 7.75V, OFF = 6.5V - optimized for lower-voltage start-up. |
| SOUT (16) | Synchronous rectifier sync signal | ±50mA drive, 12V clamp; phase-aligned with OUT; used to control secondary-side synchronous rectifiers. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectifier control | Dual outputs (OUT + SOUT) enable precise timing coordination between primary switch and secondary-side FETs, boosting efficiency beyond 90% in forward topologies. |
| Adaptive volt-second clamp | SD_VSEC/SS_MAXDC resistor-based clamp eliminates need for timing capacitor and reduces dependency on oscillator accuracy - improves reliability over temperature and process variation. |
| True PWM soft-start | Ramping SS_MAXDC voltage gradually increases duty cycle limit, avoiding inrush current and transformer saturation during power-up. |
| Hiccup-mode short-circuit protection | 107mV OC threshold triggers immediate shutdown and automatic restart after fault clearance - minimizes stress on MOSFET and magnetics during sustained overload. |
| Low-power start-up | 400µA VIN start-up current allows use of high-value RC networks from auxiliary windings, eliminating dedicated bias supplies in space-constrained designs. |
Applications
| Telecom Bus Converter | Industrial Isolated DC/DC |
|---|---|
|
Use Scenario: 36V–72V telecom input converted to 12V/20A semi-regulated bus in NEBS-compliant equipment. IC Role / Device Role / Timing Role: Primary-side PWM controller managing single-MOSFET forward topology with synchronous rectification on secondary side. Use Value: Adaptive volt-second clamp enables >50% duty cycle operation at high input voltage, maximizing transformer utilization and reducing size/cost. |
Use Scenario: 48V industrial input powering isolated 5V/10A logic rails in PLC or motor drive control modules. IC Role / Device Role / Timing Role: Current-mode controller providing stable regulation across wide load transients and ambient temperature extremes (–40°C to 85°C). Use Value: MP-grade –55°C to 125°C operation ensures reliability in uncontrolled enclosures; programmable slope compensation maintains loop stability with diverse inductor selections. |
| High-Efficiency Forward Supply | Military/Aerospace Power Module |
|
Use Scenario: 25W–500W forward converter delivering 3.3V/30A output using SiC or GaN synchronous rectifiers. IC Role / Device Role / Timing Role: Dual-output controller generating precisely timed gate signals (SOUT → OUT delay) to minimize body-diode conduction loss in secondary FETs. Use Value: Adjustable DELAY pin (40–120ns) enables fine-tuning of synchronous rectifier turn-on timing for peak efficiency across line/load conditions. |
Use Scenario: Ruggedized 28V–110V input DC/DC module for airborne avionics requiring extended temperature operation and radiation-tolerant design practices. IC Role / Device Role / Timing Role: High-reliability PWM controller with fully characterized MP-grade specs, including guaranteed performance at –55°C and 125°C junction. Use Value: Low 400µA start-up current and 6.5V VIN turn-off threshold support operation from legacy aircraft power buses with brownout conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar forward converter controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3900 | Single-chip synchronous rectifier driver only - no PWM control, no error amplifier, no VREF, no OC protection. | Requires external PWM controller; used exclusively for secondary-side timing, not primary-side regulation. | Select LTC3900 only when LT1952MPGN-1#TRPBF's primary control functions are already implemented elsewhere in the design. |
| UCC2891DR | Fixed 100kHz frequency, no programmable fOSC or SYNC; no SOUT output; no volt-second clamp; only basic UVLO and OCP. | Targeted at cost-sensitive, lower-power forward supplies (<200W); lacks adaptive duty cycle control and synchronous timing flexibility. | Choose UCC2891DR only for non-critical, fixed-frequency applications where extended temperature range and advanced protection are not required. |
Compared with LTC3900 and UCC2891DR, the LT1952MPGN-1#TRPBF uniquely integrates full primary-side PWM control, adaptive volt-second clamping, dual synchronized outputs, and extended temperature assurance - making it the sole option for high-reliability, high-efficiency forward converters demanding >50% duty cycle and robust fault handling.
Availability
LT1952MPGN-1#TRPBF is available at Aetrix Electronics and suitable for telecom bus converters, industrial isolated DC/DC supplies, and high-efficiency forward power modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1952MPGN-1#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) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving aerospace, industrial, automotive, and communications markets.
The LT1952MPGN-1#TRPBF belongs to Linear's legacy high-voltage PWM controller product line, engineered specifically for rugged, high-efficiency forward converter topologies in telecom infrastructure and mission-critical power systems.
FAQ
What is the guaranteed operating temperature range for LT1952MPGN-1#TRPBF?
The LT1952MPGN-1#TRPBF is fully tested and guaranteed over the –55°C to 125°C junction temperature range (MP-grade). This includes all electrical specifications - such as 107mV OC threshold, 400µA startup current, and 1.32V SD_VSEC trip point - validated across the full range, unlike E- or I-grade variants.
How does LT1952MPGN-1#TRPBF implement adaptive duty cycle clamping without an external capacitor?
The LT1952MPGN-1#TRPBF uses resistor-ratio programming on SD_VSEC and SS_MAXDC pins to generate a voltage-dependent maximum duty cycle limit. As SD_VSEC voltage rises with input voltage, the clamp tightens - eliminating capacitor drift, tolerance, and temperature errors inherent in RC-based clamps. This is confirmed in Figures 22–24 of the datasheet.
Can LT1952MPGN-1#TRPBF be synchronized to an external clock, and what is the maximum frequency?
Yes, the SYNC pin accepts logic-level inputs with 10%–90% duty cycle and supports synchronization up to 500kHz (per Note 7). The maximum allowed SYNC frequency is 1.5×fOSC - so if programmed for 300kHz operation, SYNC can run up to 450kHz. This enables precise system-level timing alignment in multi-rail power architectures.
What is the purpose of the DELAY pin on LT1952MPGN-1#TRPBF, and how is it configured?
The DELAY pin programs the time offset (40–120ns typical) between SOUT and OUT rising edges using a resistor to ground. This delay optimizes synchronous rectifier turn-on timing in forward converters to avoid cross-conduction and minimize body-diode losses. Configuration is verified in Figure 19 and Table on page 8 of the datasheet.
Does LT1952MPGN-1#TRPBF provide hiccup-mode protection, and how is it triggered?
Yes, LT1952MPGN-1#TRPBF implements hiccup-mode protection triggered by any of three conditions: VIN < 6.5V, SD_VSEC < 1.32V, or OC > 107mV. Upon trigger, both SOUT and OUT shut down immediately, SS_MAXDC discharges, and restart occurs only after all faults clear and SS_MAXDC falls below 0.45V - confirmed in Figure 1 and Operation section.
LT1952MPGN-1#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):
- 6.82V ~ 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-1#TRPBF FAQ
1.How can I place an order for LT1952MPGN-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1952MPGN-1#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-1#TRPBF reliable?
The price and inventory of LT1952MPGN-1#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-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1952MPGN-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1952MPGN-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1952MPGN-1#TRPBF?
LT1952MPGN-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1952MPGN-1#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-1#TRPBF?
For technical support, including LT1952MPGN-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1952MPGN-1#TRPBF requirements.
6.How does Aetrix verify that LT1952MPGN-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1952MPGN-1#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-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1952MPGN-1#TRPBF?
All LT1952MPGN-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1952MPGN-1#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-1#TRPBF part is unused and in its original packaging.
Return procedure for LT1952MPGN-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1952MPGN-1#TRPBF Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
