My Inquiry
My Account
Analog Devices Inc. LT3992IUH#PBF
- Part No.:
- LT3992IUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LT3992IUH#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A DL 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,690
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT3992IUH#PBF from Analog Devices (formerly Linear Technology) is a monolithic dual-channel current-mode PWM step-down DC/DC converter with two integrated 4.6A NPN power switches, operating from 3V to 60V input, delivering up to 3A per channel, and supporting independent tracking, sequencing, and antiphase switching at 250kHz–2MHz. It enables compact 12V/5V two-stage regulation in automotive and industrial power systems.
For engineers reviewing the LT3992IUH#PBF datasheet, LT3992IUH#PBF pinout, LT3992IUH#PBF application, or LT3992IUH#PBF equivalent, key selection considerations include its dual-channel programmable current limit (1.8A–4.8A), 180° phase-shifted operation for ripple reduction, die temperature monitoring (TJ pin), and FMEA-compliant 32-lead 5mm × 5mm QFN package rated for –40°C to 125°C junction temperature.
Technical Context
The LT3992IUH#PBF implements independent current-mode control per channel, with separate FB, SS, SHDN, ILIM, CMPI/CMPO, and VC pins enabling precise tracking, soft-start sequencing, and power-good signaling. Each channel features cycle-by-cycle peak current limiting and slope compensation automatically adjusted during external synchronization.
Its oscillator supports resistor-programmed (250kHz–2MHz) or externally synchronized operation, with channel 1 frequency divisible by 1/2/4/8 via the DIV pin while maintaining strict 180° phase alignment between channels - reducing input/output capacitor stress and EMI through interleaved operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 60V - supports wide-range industrial, automotive, and telecom inputs without pre-regulation. |
| Output Current per Channel | Up to 3A - sustained delivery enabled by internal 4.6A NPN switches and thermal design with exposed pad. |
| Switching Frequency Range | 250kHz to 2MHz - adjustable via RT/SYNC resistor or external clock; higher frequencies reduce inductor/capacitor size. |
| Feedback Reference Voltage | 806mV ±13mV - high-accuracy reference enables tight output regulation across temperature and load. |
| Quiescent Current (Dual Shutdown) | <10µA - ultra-low standby power ideal for always-on systems requiring long battery life or low-power sleep modes. |
| Junction Temp Monitoring | TJ pin outputs 250mV at 25°C +10mV/°C - enables real-time thermal margining and overtemperature protection without external sensors. |
| Duty Cycle Maximum | 95% - supports high-input-to-output voltage ratios (e.g., 60V→5.3V) with minimal dropout loss. |
Pinout & Package
LT3992IUH#PBF uses a 32-lead 5mm × 5mm plastic QFN package with exposed thermal pad (Pin 33 = GND), optimized for thermal performance (θJA = 44°C/W, θJC(PAD) = 7.3°C/W). All DNC pins must remain unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST1/BST2 | Bootstrap supply for NPN base drive | Enables full saturation of internal 4.6A switches; requires external ceramic capacitor tied to SWx. |
| SW1/SW2 | Emitter of internal NPN power switch | High dV/dt node requiring local Schottky catch diode and low-inductance VIN decoupling. |
| FB1/FB2 | Negative input to error amplifier | Regulated to 806mV; sets output voltage via resistive divider; bias current flows out of pin. |
| ILIM1/ILIM2 | Peak current limit programming input | 12µA internal current source into external resistor sets channel current limit from 1.8A to 4.8A. |
| RT/SYNC | Oscillator frequency control / sync input | Resistor-to-GND sets 250kHz–2MHz; external clock on rising edge synchronizes both channels. |
| DIV | Channel 1 frequency division ratio select | 12µA current source into resistor selects ÷1, ÷2, ÷4, or ÷8 for CH1 relative to master clock. |
| CLKOUT | Synchronized clock output | 0V–2.5V square wave at master frequency; used to synchronize additional regulators or clocks. |
| TJ | Die temperature monitor output | 250mV at 25°C +10mV/°C; enables system-level thermal management without external sensor. |
| SHDN1/SHDN2 | Independent channel shutdown control | SHDN1 enables both channels; SHDN2 controls only CH2; threshold = 1.32V typical. |
| SS1/SS2 | Soft-start timing and tracking control | Current sink (13.5µA typ.) charges external capacitor; tying SS1/SS2 forces output voltage tracking. |
Key Features
| Feature | Design Value |
|---|---|
| Antiphase switching | Maintains 180° phase shift between channels to halve input ripple current and reduce required bulk capacitance. |
| Independent channel control | Separate VIN, SHDN, SS, FB, ILIM, CMPI/CMPO, and VC pins allow asymmetric sequencing, tracking, and fault handling. |
| Programmable current limit | Each channel's peak inductor current set from 1.8A to 4.8A via single resistor on ILIM pin - simplifies design for varying load requirements. |
| Dropout enhancement | Supports 95% maximum duty cycle and multi-cycle on-time extension to maintain regulation down to VIN − VOUT ≈ 1.6V. |
| FMEA-compliant package | 32-lead QFN with exposed pad meets functional safety requirements for automotive and industrial applications where failure mode analysis is mandated. |
Applications
| Automotive Front-End Power Supply | Industrial Distributed DC-DC Regulation |
|---|---|
Use Scenario: Generating 12V and 5V rails from a 12V–60V automotive battery under cold-crank (6V) and load-dump (80V transient) conditions. IC Role / Device Role / Timing Role: Dual-channel buck controller providing sequenced, tracked startup and independent power-good signaling for ADAS domain controllers. Use Value: Eliminates need for discrete sequencing ICs; antiphase operation reduces input capacitor RMS current by ~30%, extending capacitor lifetime in harsh environments. | Use Scenario: Powering isolated I/O modules and fieldbus interfaces in PLC backplanes with variable input (24V–48V DC) and strict EMC requirements. IC Role / Device Role / Timing Role: Primary DC-DC regulator delivering 5V/3A and 3.3V/3A with synchronized switching to minimize conducted EMI across shared input bus. Use Value: 180° phase alignment cuts peak input current by 50%, allowing smaller input filters and meeting EN 61000-3-2 Class A harmonic limits. |
| Telecom Intermediate Bus Converter | Medical Imaging Power Subsystem |
Use Scenario: Converting 48V intermediate bus to 12V and 5V for FPGA, memory, and analog signal chain supplies in 5G base station radios. IC Role / Device Role / Timing Role: High-efficiency dual-buck controller with external clock synchronization to align switching with baseband processor clocks and avoid beat frequencies. Use Value: CLKOUT pin enables deterministic jitter-free synchronization across multiple LT3992 units, preventing spectral spreading and easing EMI filter design. | Use Scenario: Providing tightly regulated, low-noise 5V and 3.3V supplies for CCD/CMOS image sensors and ADC front-ends in portable ultrasound devices. IC Role / Device Role / Timing Role: Dual-channel regulator with independent soft-start and tracking to prevent inrush-induced voltage droop during sensor initialization sequences. Use Value: SS1/SS2 tie capability ensures matched ramp rates; TJ pin enables real-time thermal derating to protect sensitive analog components during extended acquisition cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8640SEUH#PBF | Single-channel, 4A Silent Switcher® with integrated MOSFETs; 3V–42V input; no DIV or antiphase support. | Lacks dual-channel independence and interleaving; better suited for space-constrained single-rail designs needing ultra-low EMI. | Select when EMI is critical and dual-rail sequencing is handled externally; not a drop-in replacement for LT3992IUH#PBF. |
| TPS54560QDGQRQ1 | Single-channel, 5A automotive-grade buck; 3.5V–60V input; no second channel, no TJ monitor, no CLKOUT. | Requires two units plus external sequencing logic; lacks die temperature feedback and clock synchronization capability. | Choose for cost-sensitive automotive applications where dual-channel integration is unnecessary and thermal monitoring is handled separately. |
Compared with LT8640SEUH#PBF and TPS54560QDGQRQ1, the LT3992IUH#PBF uniquely integrates dual independent 3A buck channels with antiphase operation, die temperature sensing, and master clock distribution - reducing BOM count, PCB area, and system-level thermal/EMI validation effort in multi-rail embedded power systems.
Availability
LT3992IUH#PBF is available at Aetrix Electronics and suitable for automotive front-end supplies, industrial distributed regulation, and telecom intermediate bus converters requiring stable component supply, extended temperature operation (–40°C to 125°C), and functional safety compliance.
Supply support for LT3992IUH#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 its legacy high-performance power management portfolio with rigorous automotive and industrial qualification.
The LT3992IUH#PBF belongs to Linear's monolithic high-voltage dual buck regulator family, designed specifically for demanding multi-rail power systems in automotive, industrial, and telecom infrastructure where reliability, thermal robustness, and EMI control are critical.
FAQ
What is the maximum input voltage rating for the LT3992IUH#PBF?
The LT3992IUH#PBF has an absolute maximum input voltage rating of 60V on VIN1 and VIN2 pins. Operation is specified from 3V to 60V, making it suitable for 48V industrial buses and automotive applications including cold-crank and load-dump transients. Exceeding 60V risks permanent damage per Absolute Maximum Ratings.
How does the LT3992IUH#PBF achieve antiphase switching between channels?
The LT3992IUH#PBF maintains a fixed 180° phase relationship between channel 1 and channel 2 by deriving CH2's clock directly from the master oscillator with inherent inversion. This occurs regardless of whether frequency is set by RT/SYNC resistor or external synchronization - ensuring consistent ripple cancellation and reduced input capacitor stress in all operating modes.
Can the LT3992IUH#PBF operate with only one channel enabled?
Yes - the LT3992IUH#PBF supports independent channel control: driving SHDN2 low disables only channel 2 while channel 1 remains active. However, SHDN1 must be high for any channel to operate, as it powers internal bias circuitry including the oscillator and references. Disabling both channels reduces total quiescent current to <10µA.
What is the function of the DIV pin on the LT3992IUH#PBF?
The DIV pin on the LT3992IUH#PBF sets the frequency division ratio for channel 1 relative to the master clock. An internal 12µA current source pulls the pin; connecting a resistor to ground generates voltages that select ÷1, ÷2, ÷4, or ÷8 division - enabling optimization of component size and efficiency for asymmetric output requirements (e.g., 400kHz on CH1, 1.6MHz on CH2).
Does the LT3992IUH#PBF provide power-good signaling for each channel?
Yes - each channel has dedicated CMPI and CMPO pins. Connecting CMPI to FB generates a power-good signal when output reaches 90% of regulation (725mV threshold); CMPO is an open-collector output sinking current when the condition is met. CMPO1 and CMPO2 can be wire-OR'd to form a single system-level power-good indicator for the LT3992IUH#PBF.
LT3992IUH#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 57V
- Current - Output:
- 3A
- Frequency - Switching:
- 110kHz ~ 2.5MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LT3992IUH#PBF FAQ
1.How can I place an order for LT3992IUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3992IUH#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 LT3992IUH#PBF reliable?
The price and inventory of LT3992IUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3992IUH#PBF is usually 5 days.
3.What payment methods are accepted for LT3992IUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3992IUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3992IUH#PBF?
LT3992IUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3992IUH#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 LT3992IUH#PBF?
For technical support, including LT3992IUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3992IUH#PBF requirements.
6.How does Aetrix verify that LT3992IUH#PBF is sourced from the original manufacturer or authorized distributors?
All LT3992IUH#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 LT3992IUH#PBF meets industry standards.
7.What is the process for return or replacement of LT3992IUH#PBF?
All LT3992IUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3992IUH#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 LT3992IUH#PBF part is unused and in its original packaging.
Return procedure for LT3992IUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3992IUH#PBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
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…
