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Analog Devices Inc. LTC3788EGN-1#TRPBF
- Part No.:
- LTC3788EGN-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3788EGN-1#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,620
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Product details
Overview
LTC3788EGN-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 regulated high-voltage rails with tight transient response.
For engineers reviewing the LTC3788EGN-1#TRPBF datasheet, LTC3788EGN-1#TRPBF pinout, LTC3788EGN-1#TRPBF application, or LTC3788EGN-1#TRPBF equivalent, key selection criteria include its dual-channel current-mode control architecture, RSENSE/DCR sensing flexibility, OPTI-LOOP compensation, 125µA quiescent current in sleep mode, and 28-pin SSOP package with independent RUN/SS/PGOOD per channel.
Technical Context
The LTC3788EGN-1#TRPBF implements a constant-frequency current-mode control architecture with two 180° out-of-phase channels, each using an error amplifier (EA) with transconductance of 2 mmho and ITH-based peak current limiting. Its OPTI-LOOP compensation adapts loop stability across wide output capacitance and ESR ranges without external component changes.
It supports three light-load operating modes via PLLIN/MODE pin: Burst Mode (125µA IQ), pulse-skipping (lower ripple than Burst), or forced continuous conduction (constant frequency). The internal 5.4V LDO powers gate drivers from VBIAS or EXTVCC, with automatic switchover at 4.8V and <8µA shutdown current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V (operates down to 2.5V after startup); supports 12V/24V/36V battery and industrial bus architectures. |
| Output Voltage Range | Up to 60V; set by external resistor divider on VFB1/VFB2; enables high-voltage LED drivers or telecom bias supplies. |
| Switching Frequency | 75kHz–850kHz phase-lockable; programmable 50kHz–900kHz via FREQ pin resistor; balances efficiency vs. magnetics size. |
| Reference Voltage | ±1% 1.200V over –40°C to 125°C; ensures precise output regulation under thermal stress. |
| Quiescent Current | 125µA (one channel in sleep), 200µA (both in sleep); enables always-on auxiliary rails in low-power systems. |
| Current Sensing | RSENSE or inductor DCR sensing; supports accurate current limiting and cycle-by-cycle protection without sense resistor loss. |
| Duty Cycle | 100% capability for top MOSFET; allows VIN-to-VOUT step-up with minimal dropout in high-ratio applications. |
Pinout & Package
Package: 28-lead plastic SSOP (GN), 5.6mm × 10.2mm, exposed pad, rated for –40°C to 125°C junction temperature (θJA = 80°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH1, ITH2 (1, 13) | Error amplifier output / current limit threshold | Sets peak inductor current; voltage directly controls current trip point (68–82mV max sense threshold). |
| VFB1, VFB2 (2, 12) | Feedback input for output regulation | Compares divided output voltage to 1.2V reference; enables precision ±1% output setting. |
| SENSE1+, SENSE1–, SENSE2+, SENSE2– (3,4,11,10) | Current sense differential inputs | Accepts RSENSE or DCR voltage; common-mode range 2.5V–38V supports high-side sensing in boost topology. |
| FREQ (5) | Oscillator frequency programming | Resistor-to-GND sets 50–900kHz; tied to GND/INTVCC selects 350/535kHz fixed frequency. |
| PLLIN/MODE (6) | Sync input / light-load mode select | Drives external clock for phase lock; grounded = Burst Mode, INTVCC = continuous, mid-voltage = pulse-skipping. |
| RUN1, RUN2 (8, 9) | Channel enable control | 1.28V threshold with 100mV hysteresis; supports independent startup/shutdown sequencing. |
| SS1, SS2 (28, 14) | Soft-start ramp control | 10µA internal current charges external capacitor; linearly ramps VOUT from 0V to final value. |
| PGOOD1 (27) | Power-good indicator | Open-drain output asserts low when VOUT deviates >±10%; 25µs delay prevents false trips during transients. |
| TG1, TG2 (25, 16) | Top gate drive outputs | Drive synchronous NMOS gates; 1.2Ω pull-up/down, 20ns rise/fall, 70ns dead-time control. |
| BG1, BG2 (23, 18) | Bottom gate drive outputs | Drive main NMOS gates; same drive strength as TG pins; supports high-current boost stages. |
| SW1, SW2 (26, 15) | Switch node connections | Connect to inductor, source of synchronous MOSFET, drain of main MOSFET; handles high dv/dt switching nodes. |
| BOOST1, BOOST2 (24, 17) | Floating supply for top gate drivers | Charge-pump powered; bypassed to SW with ceramic cap; enables 100% duty cycle operation. |
| VBIAS (22) | Main bias supply input | 4.5V–38V input; powers internal LDO; can be tied to VIN or boosted output for efficiency optimization. |
| EXTVCC (20) | External VCC input | Switchover at 4.8V; bypasses internal LDO to reduce power loss when efficient external 5.4V rail is available. |
| INTVCC (19) | Internal 5.4V regulator output | Powers control logic and gate drivers; requires ≥4.7µF low-ESR capacitor to PGND for stability. |
| PGND (21) | Power ground return | Low-impedance return for bottom MOSFET sources and output capacitors; must tie to SGND at single point. |
| SGND (7) | Signal ground reference | Reference for feedback, compensation, and sense circuits; isolated from PGND except at star point. |
Key Features
| Feature | Design Value |
|---|---|
| 2-phase interleaved operation | Reduces input/output ripple current by ~70% vs. single-phase, enabling smaller input/output capacitors and lower EMI. |
| OPTI-LOOP compensation | Automatically adjusts loop gain across 10:1 variation in output capacitance and ESR - eliminates manual compensation redesign. |
| Independent soft-start per channel | Prevents inrush current and output overshoot in dual-rail systems; enables staggered startup for reduced system-level surge. |
| Three selectable light-load modes | Burst Mode (max efficiency), pulse-skipping (low ripple + moderate efficiency), forced CCM (lowest noise/ripple, fixed frequency). |
| 100% duty cycle capability | Enables VIN-to-VOUT regulation even when input approaches output voltage - critical for battery-powered boost near end-of-discharge. |
| Robust protection suite | Includes undervoltage lockout (4.1V/3.6V thresholds), overvoltage detection, reverse-current prevention, and thermal shutdown. |
Applications
| Industrial Power Supply | Automotive Infotainment |
|---|---|
Use Scenario: Generating stable 24V and 48V rails from 12V vehicle battery for ADAS camera modules and radar processors. IC Role / Device Role / Timing Role: Dual-output synchronous boost controller managing two independent high-efficiency DC/DC stages with phase interleaving. Use Value: Reduces input ripple and EMI emissions below CISPR-25 Class 5 limits while maintaining <±1% output regulation across cold-crank (4.5V) to load-dump (38V) conditions. | Use Scenario: Powering LCD backlight and audio amplifier from 12V battery in head unit with strict standby current budget. IC Role / Device Role / Timing Role: Dual-channel boost controller delivering 18V (backlight) and 12V (audio) with independent RUN/SS control and Burst Mode for <150µA system sleep current. Use Value: Achieves 92% efficiency at 100mA load per channel in Burst Mode, extending infotainment runtime during vehicle key-off state. |
| Medical Imaging Subsystem | Military Portable Radio |
Use Scenario: Providing isolated 36V and 52V bias supplies for CCD sensor arrays and analog front-end amplifiers in handheld ultrasound devices. IC Role / Device Role / Timing Role: High-precision dual boost controller with ±1% reference and OPTI-LOOP ensuring stable imaging voltage despite battery sag and temperature drift. Use Value: Maintains <0.1% output deviation over –20°C to 70°C ambient, eliminating image artifacts caused by supply-induced gain drift. | Use Scenario: Generating 28V RF PA bias and 15V digital core supply from 24V military battery in manpack radios with MIL-STD-810 shock/vibe requirements. IC Role / Device Role / Timing Role: Ruggedized dual boost controller with 40V absolute max ratings on BOOST/SW pins and 125°C junction rating. Use Value: Survives 100g mechanical shock events without latch-up; maintains regulation during 2.5V brownout transients from engine cranking. |
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 |
|---|---|---|---|
| LTC3788IGN-1#TRPBF | Same die, extended –40°C to 125°C guaranteed temp grade (vs. E-grade's 0°C to 85°C spec); identical pinout and electrical specs. | Required for full-spec operation in automotive under-hood or military environments where ambient exceeds 85°C. | Select when full temperature range validation and production traceability across –40°C to 125°C are mandatory. |
| MP24894GS-Z | Single-channel, 4.5V–60V input, 60V max output; no phase interleaving, no PLL sync, no independent soft-start; 16-pin QFN. | Suitable only for single-rail designs; lacks dual-channel coordination, burst-mode optimization, and OPTI-LOOP. | Consider only for cost-sensitive, space-constrained single-output applications where dual-phase benefits are unnecessary. |
Compared with LTC3788EGN-1#TRPBF, the LTC3788IGN-1#TRPBF offers guaranteed performance across the full industrial temperature range but shares identical functionality, while the MP24894GS-Z provides lower-cost single-channel operation at the expense of interleaving, light-load efficiency tuning, and design flexibility.
Availability
LTC3788EGN-1#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive infotainment systems, and medical imaging subsystems requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for LTC3788EGN-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 LTC3788-1 product line delivers high-efficiency, dual-phase synchronous boost controllers optimized for demanding industrial, automotive, and medical applications requiring precise regulation, robust protection, and flexible light-load operation.
FAQ
What is the maximum output voltage supported by the LTC3788EGN-1#TRPBF?
The LTC3788EGN-1#TRPBF supports output voltages up to 60V, set by external resistor dividers on VFB1 and VFB2 pins. This is enabled by its high-voltage gate drivers (BOOST/SW pins rated to 76V/70V) and robust internal circuitry designed for high-ratio boost conversion in industrial and telecom applications.
Does the LTC3788EGN-1#TRPBF support synchronization to an external clock source?
Yes, the LTC3788EGN-1#TRPBF supports external synchronization via the PLLIN/MODE pin, which functions as a phase detector input. When driven by an external clock, it locks the internal oscillator to the external frequency (75kHz–850kHz) and aligns the rising edge of BG1 to the external clock's rising edge, enabling multi-controller coherence in complex power systems.
How does the OPTI-LOOP compensation in the LTC3788EGN-1#TRPBF simplify design?
The OPTI-LOOP compensation in the LTC3788EGN-1#TRPBF automatically adapts loop stability across a wide range of output capacitance and ESR values - eliminating the need for manual compensation network redesign when changing bulk capacitors or using polymer vs. ceramic types. This reduces design iterations and improves first-pass success in high-reliability applications.
What are the key differences between Burst Mode, pulse-skipping, and forced continuous operation on the LTC3788EGN-1#TRPBF?
The LTC3788EGN-1#TRPBF offers three light-load modes: Burst Mode (125µA IQ, highest efficiency, discontinuous), pulse-skipping (moderate efficiency, low ripple, fixed-frequency down to ~1% load), and forced continuous (lowest ripple/noise, constant frequency, lowest light-load efficiency). Selection is controlled via the PLLIN/MODE pin voltage level.
Can the LTC3788EGN-1#TRPBF operate with only one channel enabled?
Yes, the LTC3788EGN-1#TRPBF supports independent channel control via RUN1 and RUN2 pins. Either channel can be disabled while the other remains active, allowing flexible power sequencing, fault isolation, and partial-system operation - e.g., powering a backup rail while main rail is offline, without compromising efficiency or regulation on the active channel.
LTC3788EGN-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
LTC3788EGN-1#TRPBF FAQ
1.How can I place an order for LTC3788EGN-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3788EGN-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 LTC3788EGN-1#TRPBF reliable?
The price and inventory of LTC3788EGN-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 LTC3788EGN-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3788EGN-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3788EGN-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3788EGN-1#TRPBF?
LTC3788EGN-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3788EGN-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 LTC3788EGN-1#TRPBF?
For technical support, including LTC3788EGN-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3788EGN-1#TRPBF requirements.
6.How does Aetrix verify that LTC3788EGN-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3788EGN-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 LTC3788EGN-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3788EGN-1#TRPBF?
All LTC3788EGN-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3788EGN-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 LTC3788EGN-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3788EGN-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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