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Analog Devices Inc. LTC3788EGN-1#PBF
- Part No.:
- LTC3788EGN-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3788EGN-1#PBF.pdf
- Description:
- IC REG CTRLR BOOST 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,556
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Product details
Overview
LTC3788EGN-1#PBF 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 75–850kHz switching, and independent soft-start for each channel - used in industrial power supplies requiring regulated high-voltage rails.
For engineers reviewing the LTC3788EGN-1#PBF datasheet, LTC3788EGN-1#PBF pinout, LTC3788EGN-1#PBF application, or LTC3788EGN-1#PBF 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 thermal performance rated to 125°C junction temperature.
Technical Context
The LTC3788EGN-1#PBF implements a constant-frequency current-mode control architecture with two independent controllers operating 180° out-of-phase to reduce input/output ripple. Each channel uses an error amplifier (gm = 2 mmho) comparing VFB to a precision 1.2V reference, with ITH pin setting peak current limit and enabling OPTI-LOOP compensation across wide output capacitance and ESR ranges.
It supports three light-load operating modes via PLLIN/MODE pin: Burst Mode (125µA IQ), pulse-skipping, or forced continuous conduction - with internal LDO powering gate drivers from VBIAS or EXTVCC (switchover at 4.8V). The device integrates top/bottom gate drivers with 1.2Ω pull-up/down resistance, 70ns switch-on delay, and 100% duty cycle capability for synchronous rectification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V (operates down to 2.5V after startup); supports wide battery chemistries and industrial bus voltages. |
| Output Voltage Range | Up to 60V; enables high-voltage bias rails for amplifiers, sensors, or LED drivers without external level-shifting. |
| Switching Frequency | 75–850kHz phase-lockable; programmable 50–900kHz via FREQ pin resistor; allows optimization of efficiency vs. size trade-off. |
| Reference Accuracy | ±1% at 1.2V over –40°C to 125°C; ensures stable regulation across temperature and load for precision power rails. |
| Quiescent Current | 125µA (one channel in sleep mode); extends battery life in always-on industrial monitoring systems. |
| Current Sensing | RSENSE or inductor DCR sensing; eliminates need for dedicated sense resistors in cost-sensitive designs. |
| Package | 28-lead plastic SSOP (GN); 80°C/W θJA; compatible with standard reflow and automated assembly processes. |
Pinout & Package
28-lead plastic SSOP (GN) package with exposed pad for thermal enhancement; JEDEC MS-012AC compliant; 0.025" pitch; body dimensions 10.2mm × 5.3mm × 1.75mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH1, ITH2 (1, 13) | Error amplifier output / current limit threshold | Sets peak inductor current per channel; enables OPTI-LOOP compensation network connection. |
| VFB1, VFB2 (2, 12) | Feedback input | Connects to resistor divider on output rail; regulates voltage to precise 1.2V reference. |
| SENSE1+, SENSE2+ (3, 11) | Positive current sense input | Accepts high-side or low-side RSENSE/DCR signal; powers internal comparator. |
| SENSE1–, SENSE2– (4, 10) | Negative current sense input | Common-mode range 2.5V–38V; supports sensing across full input voltage range. |
| FREQ (5) | Oscillator frequency control | Resistor-to-GND sets 50–900kHz; tie to GND/INTVCC for fixed 350/535kHz operation. |
| PLLIN/MODE (6) | Sync input / light-load mode select | Accepts external clock for phase-locking; selects Burst/Pulse-Skipping/Continuous mode. |
| SGND (7) | Signal ground reference | Star point for feedback, compensation, and small-signal components; separates from PGND. |
| RUN1, RUN2 (8, 9) | Channel enable control | 1.28V threshold with 100mV hysteresis; enables independent channel sequencing and shutdown. |
| SS1, SS2 (14, 28) | Soft-start ramp input | 10µA internal current charges external capacitor; controls output voltage rise time. |
| PGOOD1 (27) | Power-good indicator | Open-drain output asserts low if VOUT deviates >±10%; 25µs delay prevents false trips. |
| TG1, TG2 (16, 25) | Top gate driver output | Drives synchronous NMOS gate; 1.2Ω pull-up/pull-down; supports 100% duty cycle. |
| BG1, BG2 (18, 23) | Bottom gate driver output | Drives main NMOS gate; 70ns turn-off-to-turn-on delay ensures shoot-through prevention. |
| SW1, SW2 (15, 26) | Switch node | Connects to inductor, MOSFET sources/drains; requires low-inductance layout for EMI control. |
| BOOST1, BOOST2 (17, 24) | Floating gate drive supply | Charge pump output; bypassed to SW with ceramic capacitor for high-side NMOS drive. |
| VBIAS (22) | Main bias supply | 4.5–38V input; powers internal LDO generating INTVCC; can be tied to VIN or VOUT. |
| EXTVCC (20) | External gate drive supply | Switchover at 4.8V; bypasses internal LDO to improve efficiency when external 5V rail is available. |
| INTVCC (19) | Internal 5.4V LDO output | Powers control logic and gate drivers; requires ≥4.7µF low-ESR capacitor to PGND. |
| PGND (21) | Power ground | Return path for bottom MOSFETs and input/output capacitors; connects to SGND at single point. |
Key Features
| Feature | Design Value |
|---|---|
| 2-phase interleaved operation | Reduces input/output ripple by ~70% vs. single-phase; lowers RMS current stress on input capacitors. |
| OPTI-LOOP compensation | Enables stable loop response across 10× variation in output capacitance and ESR without redesign. |
| Independent soft-start (SS1/SS2) | Allows staggered startup of dual outputs to limit inrush current and avoid supply droop. |
| Three selectable light-load modes | Burst Mode (125µA IQ), pulse-skipping (low ripple), or forced continuous (EMI-controlled) - configurable per system needs. |
| Flexible current sensing | Supports both discrete RSENSE and lossless inductor DCR sensing - reduces BOM count and power loss. |
Applications
| Industrial Power Supply | Automotive ADAS Camera Bias |
|---|---|
Use Scenario: Generating isolated 48V bias for industrial PLC I/O modules from 24V DC bus. IC Role / Device Role / Timing Role: Dual-output synchronous boost controller regulating two independent 48V rails with interleaved switching. Use Value: 94% efficiency at 5A load reduces thermal design burden; 125µA sleep current extends uptime in standby monitoring. | Use Scenario: Providing 28V and 36V bias rails for CMOS image sensors and lens actuators in automotive surround-view cameras. IC Role / Device Role / Timing Role: 2-phase controller delivering tightly regulated high-voltage rails with low noise and fast transient response. Use Value: ±1% reference and OPTI-LOOP ensure <±15mV output deviation under load transients; Burst Mode extends battery runtime during parking mode. |
| Medical Imaging Sensor Bias | Military Radar Front-End Supply |
Use Scenario: Powering avalanche photodiode (APD) bias circuits in portable ultrasound probes requiring ultra-stable 50V rails. IC Role / Device Role / Timing Role: Precision boost controller with 1.2V reference and low-noise gate drivers minimizing output ripple. Use Value: 28-pin SSOP package fits compact handheld form factor; 125°C junction rating supports sealed enclosure operation. | Use Scenario: Generating 60V RF amplifier supply in airborne radar transceivers operating across –40°C to 85°C ambient. IC Role / Device Role / Timing Role: High-reliability dual-channel boost controller with phase-lockable frequency for EMI synchronization. Use Value: 850kHz max frequency enables compact magnetics; 4.5V–38V input range accommodates aircraft 28V bus transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3788IGN-1#PBF | Same die, extended –40°C to 125°C guaranteed temp grade; identical pinout and electrical specs. | Required for military/aerospace applications demanding full-temperature-range validation. | Select when full-temperature characterization and AEC-Q200 alignment are mandatory. |
| LTC3787EGN-1#PBF | Single-channel version; same 4.5–38V input, 60V output, 1.2V ref, but no second controller or phase-interleaving. | Used where only one high-voltage rail is needed; lacks dual soft-start and channel synchronization. | Choose for cost-sensitive single-rail designs where interleaving benefits are unnecessary. |
Compared with LTC3788IGN-1#PBF, the LTC3788EGN-1#PBF offers identical functionality at commercial temperature grade, reducing cost for industrial applications not requiring extended qualification; versus LTC3787EGN-1#PBF, it provides true dual-rail control with 180° phase shift - critical for high-current, low-ripple systems where single-channel alternatives would require parallel implementation and external synchronization.
Availability
LTC3788EGN-1#PBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive ADAS camera bias, medical imaging sensor bias, and military radar front-end supplies requiring stable component supply with long-term lifecycle support.
Supply support for LTC3788EGN-1#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3788 product line delivers high-efficiency, multi-phase synchronous boost controllers targeting high-voltage DC/DC conversion in space-constrained, thermally demanding applications - designed for reliability across harsh environments.
FAQ
What is the maximum output voltage supported by the LTC3788EGN-1#PBF?
The LTC3788EGN-1#PBF supports output voltages up to 60V. This is enabled by its robust 70V absolute maximum rating on SW and BOOST pins, combined with precise current-mode control that maintains regulation stability even at high step-up ratios. The device achieves this while maintaining ±1% reference accuracy and supporting both RSENSE and DCR current sensing methods for accurate loop control.
How does the LTC3788EGN-1#PBF manage light-load efficiency?
The LTC3788EGN-1#PBF manages light-load efficiency through three user-selectable modes via the PLLIN/MODE pin: Burst Mode (125µA IQ), pulse-skipping, or forced continuous conduction. In Burst Mode, the controller shuts down both MOSFETs when load demand drops below threshold, reducing quiescent consumption significantly. The LTC3788EGN-1#PBF enters this state automatically when ITH falls below 0.425V, resuming operation only when output voltage droop triggers error amplifier recovery.
Can the LTC3788EGN-1#PBF synchronize to an external clock source?
Yes, the LTC3788EGN-1#PBF can synchronize to an external clock source using the PLLIN/MODE pin. When an external clock is applied, the internal phase-locked loop aligns the rising edge of BG1 to the external clock's rising edge, forcing both channels into forced continuous mode. The device supports synchronization across 75–850kHz, enabling EMI reduction in noise-sensitive systems and coordinated switching in multi-converter architectures - a capability confirmed in the LTC3788EGN-1#PBF datasheet Figure 12 and "Frequency Selection" section.
What package type and thermal characteristics does the LTC3788EGN-1#PBF use?
The LTC3788EGN-1#PBF uses a 28-lead plastic SSOP (GN) package with JEDEC MS-012AC footprint. Its thermal resistance is θJA = 80°C/W, and it is rated for operation from –40°C to 125°C junction temperature. The package includes an exposed pad for enhanced thermal dissipation, and the datasheet specifies a maximum lead temperature of 300°C for 10-second soldering - making the LTC3788EGN-1#PBF suitable for automated reflow assembly and high-reliability industrial applications.
Does the LTC3788EGN-1#PBF support independent control of its two output channels?
Yes, the LTC3788EGN-1#PBF supports fully independent control of its two output channels. Each channel has dedicated RUN, SS, VFB, ITH, and current sense pins (RUN1/RUN2, SS1/SS2, etc.), enabling separate enable/disable sequencing, individual soft-start timing, and distinct output voltage setpoints. This independence allows staggered startup to limit inrush current and supports asymmetric rail generation - a core architectural feature validated in the LTC3788EGN-1#PBF typical application circuit (Figure 1a) and "Shutdown and Start-Up" section.
LTC3788EGN-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- 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:
- 28-SSOP
LTC3788EGN-1#PBF FAQ
1.How can I place an order for LTC3788EGN-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3788EGN-1#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 LTC3788EGN-1#PBF reliable?
The price and inventory of LTC3788EGN-1#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LTC3788EGN-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3788EGN-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3788EGN-1#PBF?
LTC3788EGN-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3788EGN-1#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 LTC3788EGN-1#PBF?
For technical support, including LTC3788EGN-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3788EGN-1#PBF requirements.
6.How does Aetrix verify that LTC3788EGN-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3788EGN-1#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 LTC3788EGN-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3788EGN-1#PBF?
All LTC3788EGN-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3788EGN-1#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 LTC3788EGN-1#PBF part is unused and in its original packaging.
Return procedure for LTC3788EGN-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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