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Analog Devices Inc. LTC3788IGN-1#TRPBF
- Part No.:
- LTC3788IGN-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3788IGN-1#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,087
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Product details
Overview
LTC3788IGN-1#TRPBF from Analog Devices is a 2-phase, dual-output synchronous boost controller driving all-N-channel MOSFETs for high-efficiency DC/DC conversion. It operates from 4.5V to 38V input, delivers up to 60V output, features ±1% 1.2V reference, phase-lockable 75kHz–850kHz switching, and independent soft-start for each channel-used in industrial power supplies requiring stable high-voltage rail generation.
For engineers reviewing the LTC3788IGN-1#TRPBF datasheet, LTC3788IGN-1#TRPBF pinout, LTC3788IGN-1#TRPBF application, or LTC3788IGN-1#TRPBF equivalent, key selection criteria include input voltage range (4.5V–38V), dual-channel phase-interleaved operation, current-mode control with RSENSE/DCR sensing, OPTI-LOOP compensation, and Burst Mode™ efficiency optimization at light loads.
Technical Context
The LTC3788IGN-1#TRPBF implements constant-frequency current-mode control with two independent 180° out-of-phase channels, each using an error amplifier (1.2V reference) and ITH-based peak current limit. Its OPTI-LOOP architecture adapts loop response across wide output capacitance and ESR ranges without external compensation redesign.
It supports three light-load operating modes via PLLIN/MODE pin: Burst Mode™ (125µA quiescent), pulse-skipping, or forced continuous conduction-enabling trade-offs between efficiency, ripple, and EMI. 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 - supports wide battery chemistries and industrial bus voltages; operates down to 2.5V after startup. |
| Output Voltage Range | Up to 60V - enables high-voltage rails for LED drivers, telecom, and test equipment. |
| Switching Frequency | 75kHz to 850kHz (phase-lockable) - allows EMI filtering and inductor size optimization. |
| Reference Voltage | ±1% at 1.2V - ensures tight output regulation accuracy over temperature and load. |
| Quiescent Current | 125µA (one channel in sleep) - extends battery life in always-on systems. |
| Current Sensing | RSENSE or inductor DCR - eliminates sense resistor losses while maintaining accuracy. |
| Duty Cycle | 100% capability - supports boost configurations where VIN approaches VOUT. |
Pinout & Package
Package: 28-lead plastic SSOP (GN), –40°C to +125°C operating junction temperature, θJA = 80°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH1, ITH2 | Error amplifier output / current limit threshold | Sets peak inductor current per channel; voltage directly controls current trip point (68–82mV max sense). |
| VFB1, VFB2 | Feedback input | Compares output voltage divider signal to 1.2V reference; determines regulated output voltage. |
| SENSE1+, SENSE1− SENSE2+, SENSE2− | Current sense differential inputs | Accepts RSENSE or DCR voltage drop; common-mode range 2.5V–38V supports high-side sensing. |
| TG1, TG2 BG1, BG2 | Top/bottom gate drivers | Drive N-channel MOSFET gates with 1.2Ω pull-up/down and 70ns dead-time control. |
| SW1, SW2 | Switch node | Connects to inductor, source of bottom FET, drain of top FET; rated to 70V absolute max. |
| PLLIN/MODE | Mode selection & sync input | Selects Burst Mode™, pulse-skipping, or forced CCM; accepts external clock for phase-locking. |
| SS1, SS2 | Soft-start ramp input | Internal 10µA current charges external capacitor to linearly ramp output voltage during startup. |
| PGOOD1 | Power-good indicator | Open-drain output asserts low when VOUT deviates >±10% from regulation; 25µs delay prevents false trips. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous N-channel control | Eliminates diode losses, enabling >95% efficiency in high-power boost applications. |
| OPTI-LOOP compensation | Allows single-loop compensation design across 10× variation in output capacitance and ESR without stability re-tuning. |
| Independent channel control | Enables asymmetric outputs (e.g., 12V/24V) with separate RUN, SS, and PGOOD signals per channel. |
| Three light-load modes | Burst Mode™ (125µA IQ), pulse-skipping (low ripple), or forced CCM (constant frequency)-user-selectable per system needs. |
| VBIAS/EXTVCC dual supply | Reduces power loss by sourcing INTVCC from high-efficiency converter output instead of main input rail. |
Applications
| Industrial Power Supply | Automotive Test Equipment |
|---|---|
Use Scenario: Generating isolated 48V bias rails from 12V vehicle battery in portable diagnostic tools. IC Role / Device Role / Timing Role: Dual-output synchronous boost controller managing interleaved 180° phase timing to reduce input/output ripple. Use Value: 125µA quiescent current extends battery runtime; 4.5V–38V input accommodates cold-crank transients down to 2.5V post-start. | Use Scenario: High-voltage auxiliary supply for automotive ECU validation rigs requiring stable 36V/5A output. IC Role / Device Role / Timing Role: Two-phase boost controller delivering regulated 36V with synchronized gate drive to minimize EMI in noisy lab environments. Use Value: Phase-lockable frequency avoids interference with CAN bus signaling; ±1% reference ensures precise voltage margin testing. |
| Medical Imaging Subsystem | Military Portable Radio |
Use Scenario: Powering CCD sensor bias supplies (±24V, ±36V) in handheld ultrasound units. IC Role / Device Role / Timing Role: Dual-channel controller generating complementary high-voltage rails with independent soft-start sequencing. Use Value: Independent SS1/SS2 pins prevent inrush current overlap; 125°C temp grade supports sealed enclosure thermal profiles. | Use Scenario: Compact 28V RF power amplifier supply in manpack radios operating from 14.4V Li-ion packs. IC Role / Device Role / Timing Role: Interleaved boost controller delivering low-noise 28V with pulse-skipping mode to suppress audio-band noise. Use Value: Pulse-skipping maintains constant frequency below 1% load-reducing audible coil whine while preserving RF spectral purity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3788EGN-1#TRPBF | Same die, commercial-grade (0°C to 85°C) vs industrial-grade (–40°C to 125°C) temperature range. | Not suitable for extended-temperature deployments like under-hood automotive or outdoor military use. | Select LTC3788IGN-1#TRPBF for designs requiring full –40°C to 125°C operation with guaranteed specs. |
| LTC3788-1#PBF (SSOP) | Same functionality and pinout, but non-tape-and-reel packaging (bulk) and no lead-free finish marking. | Intended for prototyping or low-volume builds; lacks TRPBF's automated placement compatibility and RoHS compliance documentation. | Choose LTC3788IGN-1#TRPBF for production volume with traceable, RoHS-compliant, machine-ready reels. |
Compared with LTC3788EGN-1#TRPBF and LTC3788-1#PBF, the LTC3788IGN-1#TRPBF provides guaranteed performance across –40°C to 125°C, tape-and-reel delivery for SMT lines, and explicit lead-free compliance-making it the only option qualified for high-reliability industrial and defense applications.
Availability
LTC3788IGN-1#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive test equipment, medical imaging subsystems, and military portable radio designs requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3788IGN-1#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and communications markets.
The LTC3788 family is designed for high-efficiency, high-voltage, multi-phase boost conversion in space-constrained, thermally demanding applications-emphasizing reliability, light-load efficiency, and flexible control architecture.
FAQ
What is the maximum input voltage rating for the LTC3788IGN-1#TRPBF?
The LTC3788IGN-1#TRPBF has an absolute maximum input voltage rating of 40V on the VBIAS pin. Its operational input range is specified from 4.5V to 38V, and it continues operating down to 2.5V after startup-making it robust against automotive cold-crank and brownout conditions. This rating is confirmed in the Absolute Maximum Ratings table and supported by the 40V abs max specification for BOOST1/BOOST2 and SW1/SW2 pins.
Does the LTC3788IGN-1#TRPBF support both RSENSE and DCR current sensing?
Yes, the LTC3788IGN-1#TRPBF supports both RSENSE and inductor DCR current sensing, as explicitly stated in the FEATURES section and verified in the Electrical Characteristics table (VSENSE(CM) = 2.5V to 38V). The SENSE+ and SENSE− pins accept differential voltage inputs with ±0.3V range and 2.5V–38V common-mode capability, enabling direct connection to either discrete sense resistors or DCR networks with appropriate RC filtering.
How does the PLLIN/MODE pin configure light-load operation on the LTC3788IGN-1#TRPBF?
The PLLIN/MODE pin on the LTC3788IGN-1#TRPBF selects light-load behavior: grounded for Burst Mode™ (125µA IQ), tied to INTVCC for forced continuous conduction, or biased to 1.2V–(INTVCC–0.5V) for pulse-skipping. This is documented in the PIN FUNCTIONS section and validated in Figure 9 and the OPERATION chapter, where each mode's impact on efficiency, ripple, and EMI is characterized.
What package type and temperature grade does the LTC3788IGN-1#TRPBF use?
The LTC3788IGN-1#TRPBF uses a 28-lead plastic SSOP (GN) package and is rated for –40°C to +125°C operating junction temperature. This is confirmed in the ORDER INFORMATION table, where "I" denotes industrial temperature grade and "GN" specifies the SSOP package-distinct from the "E" (commercial) grade LTC3788EGN-1#TRPBF.
Can the LTC3788IGN-1#TRPBF generate two different output voltages simultaneously?
Yes, the LTC3788IGN-1#TRPBF supports independent dual outputs via separate VFB1/VFB2 feedback networks, ITH1/ITH2 current limits, and SS1/SS2 soft-start controls. Each channel regulates its own output voltage (up to 60V), allowing asymmetric configurations such as 12V/24V or 15V/48V-verified in the TYPICAL APPLICATION schematic and described in the OPERATION section under "Main Control Loop."
LTC3788IGN-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- 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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC3788IGN-1#TRPBF FAQ
1.How can I place an order for LTC3788IGN-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3788IGN-1#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 LTC3788IGN-1#TRPBF reliable?
The price and inventory of LTC3788IGN-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3788IGN-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3788IGN-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3788IGN-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3788IGN-1#TRPBF?
LTC3788IGN-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3788IGN-1#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 LTC3788IGN-1#TRPBF?
For technical support, including LTC3788IGN-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3788IGN-1#TRPBF requirements.
6.How does Aetrix verify that LTC3788IGN-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3788IGN-1#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 LTC3788IGN-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3788IGN-1#TRPBF?
All LTC3788IGN-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3788IGN-1#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 LTC3788IGN-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3788IGN-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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