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Analog Devices Inc. LTC3787MPGN#TRPBF
- Part No.:
- LTC3787MPGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3787MPGN#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,811
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Product details
Overview
LTC3787MPGN#TRPBF from Analog Devices (formerly Linear Technology) is a high-performance PolyPhase® synchronous boost controller driving two out-of-phase N-channel MOSFET stages. It supports 4.5V–38V input, up to 60V output, ±1% 1.200V reference, and operates down to 2.5V after startup - enabling robust 12V-to-24V/10A industrial power conversion with reduced input/output capacitance and noise.
For engineers reviewing the LTC3787MPGN#TRPBF datasheet, LTC3787MPGN#TRPBF pinout, LTC3787MPGN#TRPBF application, or LTC3787MPGN#TRPBF equivalent, key selection criteria include its 2-phase current-mode control architecture, programmable 50kHz–900kHz switching frequency, RSENSE/DCR sensing flexibility, 135μA quiescent current in pulse-skipping mode, and –55°C to 150°C extended temperature operation in 28-pin SSOP package.
Technical Context
The LTC3787MPGN#TRPBF implements constant-frequency current-mode control with dual independent channels operating 180° out of phase. Its error amplifier regulates VFB against a precision 1.200V reference, while ITH voltage sets peak inductor current per channel. The internal 5.4V LDO powers gate drivers from either VBIAS or EXTVCC (switchover at 4.8V), supporting efficient high-side synchronous rectification.
Phase-lockable operation (75kHz–850kHz) enables synchronization across multiple controllers via PLLIN/MODE and CLKOUT pins. Light-load behavior is configurable via PLLIN/MODE: Burst Mode® (ground), pulse-skipping (1.2V–INTVCC−1.3V), or forced continuous (INTVCC). Soft-start is controlled by external capacitor on SS pin with 10μA internal charge current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V (operates down to 2.5V post-startup); supports wide battery chemistries and transient-tolerant industrial supplies. |
| Output Voltage Range | Up to 60V; enables high-ratio boost for LED drivers, industrial sensors, and HV bias rails. |
| Reference Voltage Accuracy | ±1% (1.188V–1.212V); ensures tight output regulation over temperature and load in closed-loop systems. |
| Quiescent Current | 135μA in pulse-skipping mode; minimizes standby power loss in always-on applications. |
| Switching Frequency Range | 50kHz to 900kHz (programmable via FREQ resistor); balances efficiency, size, and EMI in compact designs. |
| Shutdown Current | <8μA when RUN < 0.7V; enables ultra-low-power system-level sleep states. |
| Operating Temperature | –55°C to +150°C junction; qualified for military, automotive, and harsh-environment embedded systems. |
Pinout & Package
Package: 28-lead plastic SSOP (GN), thermally enhanced, with exposed pad not present (unlike QFN). Pin pitch: 0.025", body dimensions: 10.2mm × 5.3mm. Requires standard SSOP reflow profile and single-point PGND connection at SGND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (Pin 6) | Enable/Shutdown Control Input | Pulls below 1.28V to disable control loops; below 0.7V reduces IQ to <8μA; supports resistor-divider VIN bias with 4.5μA hysteresis current. |
| VFB (Pin 10) | Error Amplifier Feedback Input | Compares resistive divider output against 1.200V reference; determines regulated output voltage setpoint. |
| ITH (Pin 11) | Current Limit Threshold & Compensation Node | Sets peak inductor current per phase; also serves as EA compensation point for loop stability. |
| SENSE1+/SENSE1– (Pins 12,27) | Channel 1 Current Sense Inputs | Differential inputs for RSENSE or DCR sensing; common-mode range 2.5V–38V supports high-side sensing. |
| TG1/BG1 (Pins 17,19) | Top/Bottom Gate Drivers | Drive gates of synchronous N-MOSFETs; 1.2Ω pull-up/pull-down resistance supports fast 20ns edge rates. |
| BOOST1/SW1 (Pins 18,16) | Bootstrap Supply & Switch Node | SW1 connects to inductor drain/main MOSFET source; BOOST1 supplies floating gate drive for TG1. |
| PGOOD (Pin 25) | Open-Drain Power Good Output | Asserts low when VOUT deviates >±10% from regulation; 25μs delay prevents false triggering during transients. |
| ILIM (Pin 26) | Current Sense Threshold Select | Connect to SGND/FLOAT/INTVCC to set VSENSE(MAX) = 50/75/100mV - calibrates current limit without external resistors. |
Key Features
| Feature | Design Value |
|---|---|
| 2-Phase PolyPhase® Operation | Reduces RMS input/output ripple current by ~70% vs single-phase, allowing smaller capacitors and inductors in space-constrained designs. |
| Synchronous Rectification Support | Enables >95% efficiency at full load by replacing diode losses with low-RDS(on) MOSFET conduction losses. |
| 100% Duty Cycle Capability | Permits seamless transition to dropout conditions (VIN ≈ VOUT), critical for battery-powered systems near end-of-discharge. |
| Programmable Light-Load Modes | Burst Mode®, pulse-skipping, or forced continuous operation selectable via single PLLIN/MODE pin voltage - optimizing efficiency across 0.1mA–10A load range. |
| Robust Thermal Performance | θJA = 90°C/W in SSOP package; combined with –55°C to +150°C rating, supports convection-cooled industrial enclosures without heatsinks. |
Applications
| Industrial Motor Drives | Automotive ADAS Power Rails |
|---|---|
Use Scenario: Generating stable 24V/10A supply from 12V vehicle battery for radar modules and camera ISPs under cold-crank (5.5V) and load-dump (36V) conditions. IC Role / Device Role / Timing Role: Dual-phase synchronous boost controller regulating output while rejecting input transients and minimizing EMI through interleaved switching. Use Value: Enables 2-phase operation reducing input capacitor RMS current by 70%, allowing smaller 220μF ceramic banks instead of bulky electrolytics - improving reliability and cold-temperature performance. |
Use Scenario: Providing isolated 48V bias for LiDAR laser diodes in autonomous vehicles, requiring precise voltage regulation and low-noise operation near sensitive analog front-ends. IC Role / Device Role / Timing Role: High-accuracy boost controller with ±1% reference and programmable soft-start, synchronized to system clock via PLLIN/MODE to suppress beat frequencies. Use Value: Achieves <±0.25% output deviation over –40°C to +125°C ambient using internal 1.200V reference and matched current sense thresholds - eliminating need for external trimming. |
| Medical Imaging Power Supplies | Military Portable Radios |
Use Scenario: Delivering clean, low-ripple 60V supply for CCD/CMOS sensor bias in portable ultrasound devices powered from 12V lithium packs. IC Role / Device Role / Timing Role: PolyPhase® controller with RSENSE/DCR sensing flexibility and 135μA quiescent current, supporting battery life extension during standby. Use Value: Reduces output voltage ripple by 50% vs single-phase design at 10A load, enabling direct sensor powering without additional LC filtering - shrinking BOM and board area. |
Use Scenario: Converting 24V nominal military battery (18V–32V range) to regulated 28V for RF power amplifiers in handheld radios operating in extreme temperature environments. IC Role / Device Role / Timing Role: Extended-temperature boost controller with –55°C to +150°C rating and 100% duty cycle capability for brownout resilience. Use Value: Maintains regulation down to 2.5V input after startup - sustaining radio operation during deep battery discharge or cold-weather battery voltage sag without reset or dropout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3787IUFD#TRPBF | Same die, QFN-28 package (θJA = 43°C/W), rated –40°C to +125°C junction. | Better thermal performance in high-power density layouts; unsuitable for extended temperature military use. | Select when board space allows QFN and ambient temperature stays ≤125°C - improves efficiency by 2–3% at 10A due to lower thermal resistance. |
| LTC3781EGN#PBF | Single-phase version, same SSOP-28 package, –40°C to +125°C, max 40V output, no PLL sync. | Limited to lower power (≤5A) and lacks multiphase noise reduction or clock synchronization. | Choose for cost-sensitive, lower-current applications where interleaving and phase-locking are unnecessary - reduces BOM count by eliminating second MOSFET stage. |
Compared with LTC3787IUFD#TRPBF, the LTC3787MPGN#TRPBF trades thermal performance for extended temperature qualification, making it irreplaceable in aerospace or defense systems requiring –55°C startup. Versus LTC3781EGN#PBF, it delivers 2× power handling and superior EMI control but requires more layout complexity and component count.
Availability
LTC3787MPGN#TRPBF is available at Aetrix Electronics and suitable for industrial motor drives, automotive ADAS power rails, and military portable radios requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3787MPGN#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, inheriting its legacy of high-performance power management ICs with emphasis on precision, reliability, and ruggedized operation.
The LTC3787MPGN#TRPBF belongs to Linear's PolyPhase® controller family, designed specifically for high-efficiency, low-noise, multi-phase DC/DC conversion in mission-critical industrial, automotive, and defense systems where thermal resilience and parametric stability are non-negotiable.
FAQ
What is the maximum output voltage supported by the LTC3787MPGN#TRPBF?
The LTC3787MPGN#TRPBF supports output voltages up to 60V. This is enabled by its high-voltage gate drivers (BOOST1/BOOST2 rated to 76V, SW1/SW2 to 70V) and robust internal protection circuitry. The actual achievable output depends on external MOSFET ratings, inductor saturation current, and output capacitor voltage rating - but the controller itself is fully specified for 60V operation.
How does the ILIM pin affect current sensing on the LTC3787MPGN#TRPBF?
The ILIM pin on the LTC3787MPGN#TRPBF selects the maximum current sense threshold voltage: grounding sets VSENSE(MAX) = 50mV, floating yields 75mV, and connecting to INTVCC selects 100mV. This directly scales the peak inductor current limit without external resistors, simplifying design for different MOSFET RDS(on) or sense resistor values while maintaining ±12mV matching between channels.
Can the LTC3787MPGN#TRPBF operate with only one phase active?
Yes, the LTC3787MPGN#TRPBF can be configured for single-phase operation by leaving one channel unpopulated and tying unused SENSE, TG, BG, BOOST, and SW pins appropriately (e.g., SENSE2± to GND, TG2/BG2 open). However, phase-interleaving benefits - including reduced input/output ripple and EMI - are forfeited. The controller remains fully functional with one active channel.
What is the purpose of the PHASMD pin on the LTC3787MPGN#TRPBF?
The PHASMD pin on the LTC3787MPGN#TRPBF configures the phase relationship between BG1 and BG2 outputs, as well as between BG1 and CLKOUT. Floating, grounding, or tying to INTVCC selects 0°, 180°, or 90° phase offset respectively - enabling flexible multiphase daisy-chaining for 2-, 3-, 4-, 6-, or 12-phase systems while minimizing inter-channel timing skew.
Does the LTC3787MPGN#TRPBF require an external clock to achieve synchronization?
No, the LTC3787MPGN#TRPBF contains an internal PLL and can synchronize to an external clock applied to the PLLIN/MODE pin, but it also supports standalone operation with programmable fixed frequency (50kHz–900kHz) set by the FREQ pin resistor. External clocking is optional and used only when precise system-level timing alignment across multiple converters is required.
LTC3787MPGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 38V
- Frequency - Switching:
- 105kHz ~ 760kHz
- Duty Cycle (Max):
- 96%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Power Good, Soft Start
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC3787MPGN#TRPBF FAQ
1.How can I place an order for LTC3787MPGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3787MPGN#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 LTC3787MPGN#TRPBF reliable?
The price and inventory of LTC3787MPGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3787MPGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3787MPGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3787MPGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3787MPGN#TRPBF?
LTC3787MPGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3787MPGN#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 LTC3787MPGN#TRPBF?
For technical support, including LTC3787MPGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3787MPGN#TRPBF requirements.
6.How does Aetrix verify that LTC3787MPGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3787MPGN#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 LTC3787MPGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3787MPGN#TRPBF?
All LTC3787MPGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3787MPGN#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 LTC3787MPGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC3787MPGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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