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Analog Devices Inc. LTC3788IUH#TRPBF
- Part No.:
- LTC3788IUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3788IUH#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,871
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Product details
Overview
LTC3788IUH#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel, 2-phase synchronous boost controller driving all-N-channel MOSFETs for high-efficiency DC/DC conversion. It delivers up to 24V at 3A or 12V at 5A from 4.5V–38V input, features ±1% 1.2V reference, phase-lockable 75kHz–850kHz operation, and operates down to 2.5V post-startup-ideal for industrial power supplies and battery-backed systems requiring regulated high-voltage rails.
For engineers reviewing the LTC3788IUH#TRPBF datasheet, LTC3788IUH#TRPBF pinout, LTC3788IUH#TRPBF application, or LTC3788IUH#TRPBF equivalent, key selection criteria include its dual-output current-mode architecture, independent soft-start (SS1/SS2), RSENSE/DCR current sensing, programmable peak current limit via ILIM, and thermal performance in the 5mm × 5mm QFN package with exposed pad.
Technical Context
The LTC3788IUH#TRPBF implements a constant-frequency current-mode control architecture with two independent controllers operating 180° or 240° out-of-phase depending on PHASMD pin configuration. Each channel uses an error amplifier (gm = 2 mmho) comparing VFB to a precision 1.2V reference, with ITH voltage setting peak inductor current and enabling OPTI-LOOP® compensation across wide output capacitance/ESR ranges.
It supports three light-load modes selected via PLLIN/MODE: Burst Mode® (≤125µA quiescent per active channel), pulse-skipping, or forced continuous conduction. Gate drivers deliver 1.2Ω pull-up/pull-down strength with 20ns rise/fall times and 70ns dead-time control, while internal 5.4V LDO (INTVCC) can be bypassed by EXTVCC ≥4.8V for higher efficiency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V (abs max 40V); operates through transients down to 2.5V after startup-enables robust operation in automotive or battery-fed systems with brownout conditions. |
| Output Voltage Range | Up to 60V; supports dual independent outputs (e.g., 12V/5A and 24V/3A)-suitable for powering high-voltage analog front-ends or industrial sensors. |
| Switching Frequency | Programmable 50kHz–900kHz or phase-lockable 75kHz–850kHz-allows EMI optimization and inductor size reduction without sacrificing transient response. |
| Reference Voltage | ±1% accurate 1.200V over –40°C to 125°C-ensures tight output regulation across temperature and line/load variations. |
| Quiescent Current | 125µA (one channel active, sleep mode); <8µA shutdown-critical for always-on battery-powered applications. |
| Current Sense Options | RSENSE or inductor DCR sensing; peak sense threshold selectable as 50mV/75mV/100mV via ILIM pin-flexible for low-loss or cost-sensitive designs. |
| Package | 32-pin 5mm × 5mm QFN with exposed thermal pad (θJA = 34°C/W)-supports high-power density layouts with reliable thermal dissipation. |
Pinout & Package
Package: 32-lead plastic QFN (5mm × 5mm), thermally enhanced with exposed GND pad (Pin 33) requiring PCB soldering for rated thermal performance (TJMAX = 125°C).
| Pin/Terminal | 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-enables high-side or low-side sensing in wide-input systems. |
| FREQ (2) | Oscillator frequency control | Resistor-to-GND sets 50kHz–900kHz; direct DC voltage or sync clock also accepted-provides flexible frequency tuning and EMI management. |
| PLLIN/MODE (5) | Light-load mode select & sync input | GND = Burst Mode®, INTVCC = forced CCM, 1.2V–(INTVCC–1.3V) = pulse-skipping; external clock enables phase-lock-determines efficiency vs. noise trade-off. |
| PGOOD1 / PGOOD2 (27, 14) | Open-drain power-good indicator | Asserts low when VOUT deviates >±10%; 25µs delay prevents false trips-enables safe system sequencing and fault monitoring. |
| ILIM (28) | Peak current sense threshold select | SGND = 50mV, float = 75mV, INTVCC = 100mV-configures current limit without external components for design flexibility. |
| SS1 / SS2 (29, 13) | Soft-start ramp control | Internal 10µA current charges external capacitor-sets controlled output voltage ramp rate during startup to limit inrush. |
| ITH1 / ITH2 (30, 12) | Error amplifier output & current limit threshold | Voltage sets peak inductor current; also used for loop compensation-central node for stability tuning and current limiting. |
| VFB1 / VFB2 (31, 11) | Feedback input for output regulation | Compares resistive divider output to 1.2V reference-defines final regulated output voltage with ±1% accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous N-MOSFET drive | Eliminates external Schottky diodes, increasing efficiency >90% at full load and reducing thermal stress in compact enclosures. |
| OPTI-LOOP® compensation | Enables stable loop response across wide output capacitor values (e.g., 220µF ceramic + bulk) and ESR ranges-reduces design iterations. |
| Dual independent soft-start | SS1/SS2 pins allow staggered or simultaneous ramp-up of two outputs-prevents input supply sag and ensures clean power sequencing. |
| 100% duty cycle capability | Supports boost operation even when VIN approaches VOUT-extends usable input range in battery discharge scenarios. |
| Thermally enhanced QFN | Exposed pad and low θJA (34°C/W) enable >5W dissipation without heatsink-simplifies mechanical design in space-constrained industrial modules. |
Applications
| Industrial Power Supply | Automotive Infotainment |
|---|---|
Use Scenario: Generating isolated 24V rail from 12V vehicle battery for camera modules and radar processors under cold-crank (2.5V) conditions. IC Role / Device Role / Timing Role: Dual-phase synchronous boost controller regulating two independent outputs with phase interleaving to reduce input ripple. Use Value: Maintains regulation during engine start transients; 125µA sleep current extends battery life in parked-state monitoring. | Use Scenario: Powering display backlight and audio amplifier from 12V battery in head unit with strict EMI limits. IC Role / Device Role / Timing Role: High-frequency (≥500kHz) boost controller with programmable burst/pulse-skip mode to minimize conducted noise near AM/FM bands. Use Value: Phase-lockable frequency avoids sensitive frequency bands; low-noise pulse-skipping mode reduces audible coil whine. |
| Medical Imaging Sensor Bias | Military Portable Radio |
Use Scenario: Providing stable ±12V and +24V bias rails for CCD/CMOS image sensors in portable ultrasound devices. IC Role / Device Role / Timing Role: Precision dual-output controller with ±1% reference and independent PGOOD signals for system health monitoring. Use Value: Ensures sensor linearity and dynamic range; dual PGOOD enables fail-safe shutdown before data corruption. | Use Scenario: Boosting 3.6V Li-ion battery to 12V/5A for RF power amplifier in handheld tactical radios with extended shelf life. IC Role / Device Role / Timing Role: Low-quiescent-current boost controller supporting deep sleep between transmissions using RUN pin control. Use Value: <8µA shutdown current preserves battery charge over months; 100% duty cycle maintains output as battery discharges to 2.5V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3788EUH#TRPBF | Same silicon, rated for 0°C to 85°C junction temperature (vs. –40°C to 125°C for LTC3788IUH#TRPBF) | Not suitable for extended-temperature industrial or automotive under-hood use | Select LTC3788IUH#TRPBF for designs requiring guaranteed operation at –40°C or 125°C. |
| LTC3787IUH#TRPBF | Single-output variant; lacks second channel, PGOOD2, SS2, ITH2, VFB2, etc.-no dual-phase capability | Cannot support dual independent outputs or interleaved operation | Choose only if single-output boost suffices and board space/cost must be minimized. |
Compared with LTC3788EUH#TRPBF, the LTC3788IUH#TRPBF guarantees full specification compliance over –40°C to 125°C, making it essential for harsh environments; versus LTC3787IUH#TRPBF, it provides true dual-channel control with independent regulation, soft-start, and protection-critical for multi-rail systems.
Availability
LTC3788IUH#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive infotainment systems, and medical imaging equipment requiring stable component supply, long-term lifecycle support, and guaranteed extended-temperature performance.
Supply support for LTC3788IUH#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3788IUH#TRPBF belongs to Linear's PolyPhase® synchronous controller product line, designed specifically for high-efficiency, high-current DC/DC boost conversion in space- and thermally-constrained industrial, automotive, and medical systems.
FAQ
What is the maximum output voltage supported by the LTC3788IUH#TRPBF?
The LTC3788IUH#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 current sense inputs with 2.5V–38V common-mode range. The actual achievable output depends on external MOSFET ratings, inductor selection, and layout-but the controller itself is designed for high-voltage boost topologies beyond typical 24V or 48V rails.
How does the LTC3788IUH#TRPBF handle input voltage transients below its startup threshold?
The LTC3788IUH#TRPBF starts up with a minimum VIN of 4.5V but continues operating through transients down to 2.5V after startup. This is achieved via internal undervoltage lockout hysteresis (UVLO rising 4.3V, falling 3.8V) and robust biasing from VBIAS or EXTVCC. During a 2.5V dip, the controller sustains switching and regulation as long as INTVCC remains above 4.1V-critical for automotive cold-crank immunity.
Can the LTC3788IUH#TRPBF be synchronized to an external clock, and how is this configured?
Yes, the LTC3788IUH#TRPBF can be synchronized to an external clock via the PLLIN/MODE pin. When an external clock signal is applied to this pin, the internal phase-locked loop locks the rising edge of BG1 to the rising edge of the external clock, enabling precise timing alignment across multiple phases or ICs. The frequency range supported is 75kHz to 850kHz, and the pin must be driven with a logic-level square wave meeting slew rate and voltage specifications.
What are the key differences between Burst Mode®, pulse-skipping, and forced continuous conduction modes on the LTC3788IUH#TRPBF?
Burst Mode® (PLLIN/MODE = GND) maximizes light-load efficiency (<125µA IQ) but causes variable-frequency operation and higher output ripple. Pulse-skipping (PLLIN/MODE = 1.2V–INTVCC–1.3V) maintains constant frequency down to ~1% load with lower ripple and audio noise. Forced continuous (PLLIN/MODE = INTVCC) ensures fixed-frequency operation at all loads-best for EMI-sensitive or low-ripple applications despite reduced light-load efficiency. All three are implemented in the LTC3788IUH#TRPBF without external components.
Does the LTC3788IUH#TRPBF require external current sense resistors, or does it support DCR sensing?
The LTC3788IUH#TRPBF supports both RSENSE and inductor DCR current sensing. For RSENSE, connect a precision resistor between SENSE+ and SENSE–. For DCR sensing, use the inductor's inherent resistance with an RC network from SENSE+ to SW and SENSE– to PGND. The choice affects accuracy, power loss, and board area-DCR eliminates sense resistor losses but requires careful RC time-constant matching to the inductor's L/R ratio.
LTC3788IUH#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)
LTC3788IUH#TRPBF FAQ
1.How can I place an order for LTC3788IUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3788IUH#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 LTC3788IUH#TRPBF reliable?
The price and inventory of LTC3788IUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3788IUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3788IUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3788IUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3788IUH#TRPBF?
LTC3788IUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3788IUH#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 LTC3788IUH#TRPBF?
For technical support, including LTC3788IUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3788IUH#TRPBF requirements.
6.How does Aetrix verify that LTC3788IUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3788IUH#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 LTC3788IUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3788IUH#TRPBF?
All LTC3788IUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3788IUH#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 LTC3788IUH#TRPBF part is unused and in its original packaging.
Return procedure for LTC3788IUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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