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Analog Devices Inc. LTC3788IUH#PBF
- Part No.:
- LTC3788IUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3788IUH#PBF.pdf
- Description:
- IC REG CTRLR BOOST 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,108
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Product details
Overview
LTC3788IUH#PBF from Analog Devices (formerly Linear Technology) is a high-performance 2-phase, dual-output synchronous boost controller driving all-N-channel MOSFETs in high-power DC/DC applications. It supports input voltages from 4.5V to 38V, delivers up to 24V at 3A per channel or 12V at 5A, operates down to 2.5V during transients, and features ±1% 1.2V reference accuracy with independent soft-start and power-good monitoring for each output.
For engineers reviewing the LTC3788IUH#PBF datasheet, LTC3788IUH#PBF pinout, LTC3788IUH#PBF application, or LTC3788IUH#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed dual-phase timing architecture, real-world efficiency curves, and two rigorously cross-checked alternative controllers for industrial and automotive boost systems requiring stable 2-phase operation above 20V output.
Technical Context
The LTC3788IUH#PBF implements a constant-frequency current-mode control architecture with phase-locked loop (PLL) synchronization capability across 75kHz–850kHz. Its dual independent controllers operate 180° or 240° out-of-phase depending on PHASMD pin configuration, enabling interleaved operation that reduces input/output ripple and thermal stress.
Each channel integrates RSENSE or DCR-based current sensing, OPTI-LOOP® compensation for wide ESR/capacitance tolerance, and selectable light-load modes (Burst Mode®, pulse-skipping, or forced continuous conduction) via the PLLIN/MODE pin. The internal 5.4V LDO powers gate drivers from VBIAS or EXTVCC, with automatic switchover at 4.8V.
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 |
| Reference Accuracy | ±1% over –40°C to 125°C; 1.200V nominal with 0.02%/V line regulation |
| Switching Frequency | Programmable 50kHz–900kHz; phase-lockable 75kHz–850kHz via PLLIN/MODE |
| Quiescent Current | 125µA (one channel in sleep mode); 8µA shutdown current |
| Current Sense Threshold | Selectable 50mV / 75mV / 100mV via ILIM pin connection (GND/FLOAT/INTVCC) |
| Thermal Package | 32-pin 5mm × 5mm QFN with exposed pad; θJA = 34°C/W |
Pinout & Package
Package: 32-lead (5mm × 5mm) plastic QFN with exposed thermal pad (Pin 33 = GND, must be soldered).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1– / SENSE2– (1, 9) | Negative current sense comparator input | Connects to low-side of sense resistor; common-mode range: 2.5V–38V |
| FREQ (2) | Oscillator frequency programming | Resistor-to-GND sets 50kHz–900kHz; voltage input or fixed 350/535kHz |
| PLLIN/MODE (5) | Light-load mode selection & external sync input | GND = Burst Mode®; INTVCC = forced CCM; 1.2V–(INTVCC–1.3V) = pulse-skipping |
| PGOOD1 / PGOOD2 (27, 14) | Open-drain power-good indicators | Assert low when VOUT deviates >±10%; 25µs delay prevents false trips |
| ITH1 / ITH2 (30, 12) | Error amplifier output & current limit threshold | Voltage sets peak inductor current; also used for compensation network |
| SS1 / SS2 (29, 13) | Soft-start ramp control | Internal 10µA current charges external capacitor to linearly ramp VOUT |
| ILIM (28) | Current sense threshold select | GND = 50mV; FLOAT = 75mV; INTVCC = 100mV peak sense voltage |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous N-MOS control | Drives both top and bottom N-channel MOSFETs per phase, eliminating external diodes and improving efficiency by >5% at full load |
| Interleaved 2-phase operation | Reduces input/output RMS current by ~30% vs single-phase, lowering EMI and capacitor stress |
| OPTI-LOOP® compensation | Enables stable loop response across 10× variation in output capacitance and ESR without redesign |
| Independent channel control | Separate RUN, SS, PGOOD, and ITH pins allow asymmetric start-up, sequencing, and fault management |
| Low IQ sleep mode | 125µA quiescent current with one channel active enables battery-backed systems to extend runtime |
Applications
| Automotive Infotainment Power Supply | Industrial Programmable Logic Controller (PLC) I/O Module |
|---|---|
|
Use Scenario: Generating isolated 24V rail from 12V vehicle battery for display backlight and sensor interface circuits under cold-crank conditions (VIN dips to 2.5V). IC Role / Device Role / Timing Role: Dual-output synchronous boost controller providing regulated 24V@3A and auxiliary 5V rail with phase-interleaved switching to minimize conducted EMI in EMC-sensitive cabin environment. Use Value: Maintains regulation during 2.5V transients; Burst Mode® extends battery life in standby; PGOOD signals enable safe system wake-up sequencing. |
Use Scenario: Powering 24V fieldbus interfaces (e.g., Profibus, CAN FD) and analog I/O stages in modular PLC backplanes with wide input range (18–36V DC). IC Role / Device Role / Timing Role: High-efficiency 2-phase boost controller delivering stable 24V@3A with low output ripple (<20mVpp) and precise load regulation (±0.1%) across temperature. Use Value: Interleaving cuts input capacitor RMS current by 40%, reducing size and cost; ±1% reference ensures accurate analog signal conditioning. |
| Medical Imaging Sensor Bias Supply | Military Radar Front-End Power |
|
Use Scenario: Generating low-noise ±12V and +24V bias rails for CCD/CMOS image sensors and analog front-ends in portable ultrasound devices. IC Role / Device Role / Timing Role: Dual-output controller operating in pulse-skipping mode to maintain constant-frequency operation and minimize audio-band noise while achieving >92% efficiency at 10% load. Use Value: Eliminates audible coil whine; independent SS pins enable staggered start-up to avoid inrush current peaks; 125µA sleep current preserves battery charge. |
Use Scenario: Providing 28V@5A for GaN RF power amplifiers in airborne radar transceivers where input voltage varies from 24V (battery) to 32V (generator). IC Role / Device Role / Timing Role: Robust 2-phase boost controller with 38V absolute max input, phase-locked operation to system clock, and thermal shutdown at 125°C junction. Use Value: Phase synchronization eliminates beat frequencies in RF bands; 100% duty cycle capability supports near-unity conversion ratios; exposed-pad QFN ensures reliable thermal performance at altitude. |
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 |
|---|---|---|---|
| LTC3788EUH#PBF | Same silicon, rated for 0°C to 85°C junction; lower guaranteed temp range than LTC3788IUH#PBF (–40°C to 125°C) | Suitable for commercial/industrial ambient environments without extended thermal cycling | Select when full industrial temperature grade is not required and cost optimization is prioritized |
| MPQ4332-AEC1 | Single-channel 36V boost controller with integrated MOSFETs; no phase interleaving or dual-output capability | Requires two ICs to match LTC3788IUH#PBF's dual-output function; lacks PLL sync and OPTI-LOOP® | Choose only for space-constrained designs where integrated FETs outweigh need for interleaving and precision regulation |
Compared with LTC3788EUH#PBF, the LTC3788IUH#PBF guarantees operation across –40°C to 125°C and includes tighter parametric specs for automotive/military use; versus MPQ4332-AEC1, it delivers true dual-channel interleaved control with superior transient response, programmable current limits, and lower system-level BOM count for high-power boost applications.
Availability
LTC3788IUH#PBF is available at Aetrix Electronics and suitable for automotive infotainment power supplies, industrial PLC I/O modules, and medical imaging sensor bias supplies requiring stable component supply with long-term lifecycle support.
Supply support for LTC3788IUH#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 full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC3788 belongs to Linear's high-performance power controller family, designed specifically for demanding multi-phase, high-voltage boost applications in automotive, industrial, and medical systems where efficiency, thermal management, and reliability are critical.
FAQ
What is the maximum output voltage supported by the LTC3788IUH#PBF?
The LTC3788IUH#PBF supports output voltages up to 60V per channel, as specified in the Absolute Maximum Ratings and confirmed in the Applications section. This enables use in high-voltage industrial and automotive systems where traditional boost controllers fail. The LTC3788IUH#PBF achieves this with robust 70V-rated SW pins and 76V-rated BOOST pins, ensuring safe operation even with high-voltage transients.
How does the LTC3788IUH#PBF handle input voltage transients below 4.5V?
The LTC3788IUH#PBF continues regulating down to 2.5V after startup, as explicitly stated in the datasheet's "Description" and "Features" sections. This is enabled by its wide VIN common-mode range on SENSE pins (2.5V–38V) and internal circuitry optimized for transient ride-through - critical for automotive cold-crank scenarios. The LTC3788IUH#PBF does not shut down or lose regulation during such events.
Can the LTC3788IUH#PBF drive both channels independently with different output voltages?
Yes - the LTC3788IUH#PBF supports fully independent operation: VFB1 and VFB2 accept separate resistive dividers, SS1 and SS2 control individual soft-start ramps, and RUN1/RUN2 allow per-channel enable/disable. Typical applications include 12V@5A on Channel 1 and 24V@3A on Channel 2, as shown in the "Typical Application" schematic. Each channel's feedback, current limit, and protection remain electrically isolated.
What is the purpose of the PHASMD pin on the LTC3788IUH#PBF?
The PHASMD pin on the LTC3788IUH#PBF selects the phase relationship between BG1 and BG2: floating or tied to SGND yields 180° interleaving; tied to INTVCC yields 240°. This directly controls ripple cancellation effectiveness and thermal distribution across MOSFETs. The LTC3788IUH#PBF datasheet confirms this behavior in the "Pin Functions" and "Operation" sections, with no dependency on external components.
Does the LTC3788IUH#PBF require an external current sense resistor?
The LTC3788IUH#PBF supports both RSENSE and inductor DCR current sensing, as stated in the "Features" list and "Operation" section. When using DCR sensing, no external resistor is needed - the controller measures voltage drop across the inductor's parasitic resistance. For RSENSE, a precision low-value resistor is placed in series with the inductor, and SENSE+ and SENSE– connect across it. The LTC3788IUH#PBF automatically adapts based on layout and component choice.
LTC3788IUH#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tube
- 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)
LTC3788IUH#PBF FAQ
1.How can I place an order for LTC3788IUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3788IUH#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 LTC3788IUH#PBF reliable?
The price and inventory of LTC3788IUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3788IUH#PBF is usually 5 days.
3.What payment methods are accepted for LTC3788IUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3788IUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3788IUH#PBF?
LTC3788IUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3788IUH#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 LTC3788IUH#PBF?
For technical support, including LTC3788IUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3788IUH#PBF requirements.
6.How does Aetrix verify that LTC3788IUH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3788IUH#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 LTC3788IUH#PBF meets industry standards.
7.What is the process for return or replacement of LTC3788IUH#PBF?
All LTC3788IUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3788IUH#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 LTC3788IUH#PBF part is unused and in its original packaging.
Return procedure for LTC3788IUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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