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Analog Devices Inc. LTC3788EUH#TRPBF
- Part No.:
- LTC3788EUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3788EUH#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,929
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Product details
Overview
LTC3788EUH#TRPBF from Analog Devices (formerly Linear Technology) is a 2-phase, dual-output synchronous boost controller driving all-N-channel MOSFETs for high-efficiency DC/DC conversion. It supports 4.5V–38V input, delivers up to 60V output per channel (e.g., 12V@5A or 24V@3A), operates down to 2.5V post-startup, and features ±1% 1.2V reference, phase-lockable 75kHz–850kHz switching, and independent soft-start. It is used in industrial power supplies requiring high-voltage step-up with tight regulation and thermal efficiency.
For engineers reviewing the LTC3788EUH#TRPBF datasheet, LTC3788EUH#TRPBF pinout, LTC3788EUH#TRPBF application, or LTC3788EUH#TRPBF equivalent, key selection criteria include dual-phase current-mode control, RSENSE/DCR sensing flexibility, programmable current limit (42mV/75mV/100mV), OPTI-LOOP® compensation, and Burst Mode®/pulse-skipping/continuous conduction mode selection via PLLIN/MODE.
Technical Context
The LTC3788EUH#TRPBF implements a constant-frequency current-mode architecture with two independent controllers operating 180° or 240° out-of-phase depending on PHASMD pin configuration. Each channel uses an error amplifier comparing VFB to a precision 1.200V reference, with ITH voltage setting peak inductor current and enabling OPTI-LOOP® compensation across wide output capacitance and ESR ranges.
It integrates dual gate drivers (TG/BG) with 1.2Ω pull-up/down resistance, 70ns switch-on delay, and 20ns rise/fall times; a 5.4V INTVCC LDO powered from VBIAS or EXTVCC (switchover at 4.8V); and precision current sensing with ±100mV max threshold, common-mode range of 2.5V–38V, and selectable ILIM via SGND/FLOAT/INTVCC connection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V (operates through transients down to 2.5V after startup) |
| Output Voltage Range | Up to 60V per channel; typical configs: 12V@5A or 24V@3A |
| Switching Frequency | Programmable 50kHz–900kHz; phase-lockable 75kHz–850kHz via PLLIN/MODE |
| Reference Voltage | ±1% accurate 1.200V internal reference (1.188V–1.212V over temp) |
| Quiescent Current | 125µA (sleep mode, one channel active); <8µA shutdown |
| Current Sense Threshold | Selectable: 42mV (ILIM = GND), 75mV (ILIM = FLOAT), or 100mV (ILIM = INTVCC) |
| Package | 32-pin 5mm × 5mm QFN with exposed thermal pad (UH package) |
Pinout & Package
Package: 32-lead (5mm × 5mm) plastic QFN (UH), thermally enhanced with exposed GND pad (Pin 33) requiring PCB soldering for rated thermal performance (θJA = 34°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1– / SENSE2– (1, 9) | Negative current sense comparator input | Connects to low-side of sense resistor; 2.5V–38V common-mode range enables high-side or low-side sensing |
| FREQ (2) | Oscillator frequency control | Resistor-to-GND sets 50kHz–900kHz; tied to INTVCC/GND for fixed 535kHz/350kHz; accepts DC voltage for analog tuning |
| PLLIN/MODE (5) | Light-load mode select & external sync input | GND → Burst Mode®; INTVCC → forced continuous; 1.2V–(INTVCC−1.3V) → pulse-skipping; external clock → phase-lock |
| PGOOD1 / PGOOD2 (27, 14) | Open-drain power-good indicators | Assert low when VOUT deviates >±10% from regulation; 25µs debounce prevents false trips |
| ITH1 / ITH2 (30, 12) | Error amplifier output & current limit threshold | Voltage sets peak inductor current; also serves as compensation node for OPTI-LOOP® |
| VFB1 / VFB2 (31, 11) | Feedback input for output voltage regulation | Compares resistive divider output against 1.200V reference; ±5nA input bias minimizes divider error |
| SS1 / SS2 (29, 13) | Soft-start ramp control | Internal 10µA current charges external capacitor; linear 0V→1.2V ramp controls VOUT rise time |
| ILIM (28) | Current sense threshold select | SGND/FLOAT/INTVCC configures 42mV/75mV/100mV peak sense voltage for precise current limiting |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous N-MOSFET drive | Eliminates external Schottky diodes, increasing efficiency by ~5–10% and reducing heat dissipation in high-power boost stages |
| OPTI-LOOP® compensation | Enables stable loop response across 10× variation in output capacitance and ESR without component re-tuning |
| Dual independent soft-start | SS1/SS2 pins allow staggered or simultaneous ramp-up of dual outputs, preventing inrush current conflicts in multi-rail systems |
| Three light-load operating modes | Burst Mode® (125µA IQ), pulse-skipping (low ripple), or forced continuous (constant frequency) - selected per system noise/efficiency trade-off |
| Robust gate driver design | 1.2Ω pull-up/pull-down with 70ns dead-time control ensures reliable MOSFET switching and prevents shoot-through |
Applications
| Industrial Power Supply | Automotive Infotainment |
|---|---|
Use Scenario: 24V rail generation from 12V battery in PLC backplanes or motor drives requiring >3A output. IC Role / Device Role / Timing Role: Dual-phase synchronous boost controller managing two interleaved 12V→24V converters with phase offset to reduce input/output ripple. Use Value: 96% efficiency at full load and 125µA quiescent current in Burst Mode® extend uptime in unattended equipment. | Use Scenario: Generating 12V and 5V rails from automotive 9V–16V battery for head-unit display and audio amplifiers. IC Role / Device Role / Timing Role: Dual-output controller delivering regulated 12V@5A and 5V@3A with independent soft-start sequencing to avoid brownout during cold-crank. Use Value: Operates down to 2.5V input during cranking transients, maintaining critical subsystem power without reset. |
| Medical Imaging Subsystem | Military Portable Radio |
Use Scenario: High-voltage bias supply (e.g., 48V/60V) for CCD sensor arrays or X-ray detector front-ends. IC Role / Device Role / Timing Role: Precision boost controller using RSENSE current sensing and ±1% reference to maintain stable high-voltage output under dynamic imaging loads. Use Value: 100% duty cycle capability allows direct VIN-to-VOUT operation during fault recovery; ±10% PGOOD tolerance ensures clean enable signaling to FPGA sequencers. | Use Scenario: Compact 28V RF power amplifier supply from 12V tactical battery, requiring MIL-STD-704 compliant transient immunity. IC Role / Device Role / Timing Role: Interleaved dual-phase controller with phase modulation (via PHASMD) minimizing EMI in narrow-band HF/VHF bands. Use Value: Phase-locked operation synchronizes switching to system clock, eliminating beat frequencies that interfere with sensitive RF receivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3788-1EUH#TRPBF | Fixed current limit (75mV), single PGOOD, no phase modulation or CLKOUT; same pinout and package | Targeted at cost-sensitive, non-synchronized systems where phase control and dual PGOOD are unnecessary | Select when simplified BOM and reduced feature set suffice; not drop-in for full LTC3788 functionality |
| MPQ4332GLED-AEC1-Z | Single-channel, integrated MOSFETs (40V/5A), fixed 500kHz, no phase sync or dual soft-start; AEC-Q100 qualified | Automotive body electronics needing compact, qualified solution without dual-phase interleaving | Choose for space-constrained automotive modules where integration outweighs flexibility; requires redesign for dual-output |
Compared with LTC3788-1EUH#TRPBF and MPQ4332GLED-AEC1-Z, the LTC3788EUH#TRPBF uniquely supports full dual-phase synchronization, programmable current limit, and independent soft-start-critical for high-efficiency, low-EMI industrial and military power designs requiring scalability and transient robustness.
Availability
LTC3788EUH#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive infotainment systems, and medical imaging subsystems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3788EUH#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 and maintains its high-performance power management portfolio with rigorous qualification and long-term product support.
The LTC3788EUH#TRPBF belongs to Linear's PolyPhase® synchronous controller family, designed specifically for high-efficiency, high-current DC/DC boost conversion in space- and thermally-constrained industrial, automotive, and defense applications.
FAQ
What is the absolute maximum input voltage rating for the LTC3788EUH#TRPBF?
The LTC3788EUH#TRPBF has an absolute maximum VBIAS rating of 40V. Its operational input range is 4.5V to 38V, and it continues switching through input transients as low as 2.5V after startup. Exceeding 40V on VBIAS risks permanent damage per Absolute Maximum Ratings.
How does the ILIM pin configure current limit thresholds on the LTC3788EUH#TRPBF?
The ILIM pin on the LTC3788EUH#TRPBF selects peak current sense voltage: grounded → 42mV, floating → 75mV, tied to INTVCC → 100mV. These correspond to precise current limits determined by external sense resistor value, enabling accurate overcurrent protection without trimming.
Can the LTC3788EUH#TRPBF operate with only one output enabled?
Yes. The LTC3788EUH#TRPBF supports independent channel control via RUN1 and RUN2 pins. Pulling RUN1 low disables Channel 1 while Channel 2 remains fully functional with full current-mode control, soft-start, and PGOOD monitoring - ideal for asymmetric power requirements.
What thermal management is required for the LTC3788EUH#TRPBF in high-power operation?
The LTC3788EUH#TRPBF requires soldering of the exposed thermal pad (Pin 33) to a dedicated PCB copper pour for thermal performance. With θJA = 34°C/W, maintaining junction temperature ≤125°C demands adequate copper area, airflow, or heatsinking - especially at >4A per phase with 24V output.
Does the LTC3788EUH#TRPBF support external clock synchronization, and how is it implemented?
Yes. Driving the PLLIN/MODE pin with an external clock signal forces the LTC3788EUH#TRPBF into phase-locked operation, aligning BG1's rising edge to the external clock's rising edge. This enables deterministic timing across multiple controllers in multiphase systems and reduces system-level EMI.
LTC3788EUH#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- 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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LTC3788EUH#TRPBF FAQ
1.How can I place an order for LTC3788EUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3788EUH#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 LTC3788EUH#TRPBF reliable?
The price and inventory of LTC3788EUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3788EUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3788EUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3788EUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3788EUH#TRPBF?
LTC3788EUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3788EUH#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 LTC3788EUH#TRPBF?
For technical support, including LTC3788EUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3788EUH#TRPBF requirements.
6.How does Aetrix verify that LTC3788EUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3788EUH#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 LTC3788EUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3788EUH#TRPBF?
All LTC3788EUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3788EUH#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 LTC3788EUH#TRPBF part is unused and in its original packaging.
Return procedure for LTC3788EUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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