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Analog Devices Inc. LTC3788EUH#PBF
- Part No.:
- LTC3788EUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3788EUH#PBF.pdf
- Description:
- IC REG CTRLR BOOST 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,746
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Product details
Overview
LTC3788EUH#PBF 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 LTC3788EUH#PBF datasheet, LTC3788EUH#PBF pinout, LTC3788EUH#PBF application, or LTC3788EUH#PBF equivalent, key selection criteria include dual-output soft-start control (SS1/SS2), selectable light-load modes (Burst/Pulse-Skipping/Continuous), RSENSE or DCR current sensing, and thermally enhanced 5mm × 5mm QFN-32 packaging with exposed ground pad.
Technical Context
The LTC3788EUH#PBF implements constant-frequency current-mode control across two independent boost channels operating 180° or 240° out-of-phase via PHASMD pin configuration. Each channel uses separate ITH, VFB, SENSE+, SENSE−, SS, and PGOOD pins, enabling independent voltage regulation, current limiting, and power-good monitoring.
Its architecture integrates dual gate drivers (TG1/BG1/TG2/BG2), internal 5.4V LDO (INTVCC), EXTVCC switchover at 4.8V, programmable oscillator (FREQ pin), and PLLIN/MODE-controlled light-load behavior-supporting Burst Mode (≤125µA quiescent), pulse-skipping, or forced continuous conduction without external compensation re-tuning.
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 per channel; enables high-voltage rails for LED drivers, medical imaging, or telecom interfaces. |
| Reference Voltage Accuracy | ±1% over –40°C to 125°C; ensures stable output regulation across temperature and load transients. |
| Quiescent Current | 125µA (one channel in sleep mode); extends battery life in always-on backup systems. |
| Switching Frequency Range | 75kHz to 850kHz (phase-lockable); allows EMI optimization and inductor size reduction. |
| Current Sense Options | RSENSE or inductor DCR sensing; eliminates sense resistor losses while maintaining accuracy. |
| Package | 32-pin 5mm × 5mm QFN with exposed thermal pad; achieves θJA = 34°C/W for high-power density layouts. |
Pinout & Package
Package: 32-lead (5mm × 5mm) plastic QFN with exposed GND pad (Pin 33), rated for –40°C to 125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1− / SENSE2− (Pins 1, 9) | Negative current sense comparator input | Connects to low-side of sense resistor or inductor DCR; common-mode range 2.5V–38V enables high-side sensing. |
| FREQ (Pin 2) | Oscillator frequency programming | Resistor-to-GND sets 50kHz–900kHz; direct DC voltage or external clock also accepted. |
| PLLIN/MODE (Pin 5) | Light-load mode selection & external sync input | GND = Burst Mode; INTVCC = continuous conduction; 1.2V–(INTVCC–1.3V) = pulse-skipping; external clock forces PLL sync. |
| PGOOD1 / PGOOD2 (Pins 27, 14) | Open-drain power-good indicators | Assert low when output deviates >±10%; 25µs delay prevents false trips during transients. |
| SS1 / SS2 (Pins 29, 13) | Soft-start ramp control | Internal 10µA current charges external capacitor; linearly ramps VFB reference from 0V to 1.2V for controlled startup. |
| ITH1 / ITH2 (Pins 30, 12) | Error amplifier output & current limit threshold | Voltage sets peak inductor current; directly controls loop response and overcurrent protection level. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous N-channel MOSFET drive | Eliminates external diode losses; enables >95% efficiency at full load and reduces thermal design burden. |
| OPTI-LOOP® compensation | Allows stable loop response across wide output capacitance and ESR variations-no re-tuning needed for different ceramic/tantalum combinations. |
| Dual independent soft-start (SS1/SS2) | Enables staggered startup sequencing between outputs to limit inrush current and avoid supply droop. |
| Programmable current limit (ILIM pin) | Selects 50mV/75mV/100mV sense thresholds via SGND/FLOAT/INTVCC connection-supports precise overcurrent protection calibration. |
| Thermally enhanced QFN package | Exposed GND pad soldered to PCB provides low thermal resistance (θJA = 34°C/W), critical for sustained 5A+ output capability. |
Applications
| Industrial Power Supply | Automotive ADAS Camera Rail |
|---|---|
|
Use Scenario: Generating isolated 24V rail from 12V vehicle battery for radar modules and camera sensors. IC Role / Device Role / Timing Role: Dual-phase synchronous boost controller regulating two independent outputs with tight transient response and low EMI. Use Value: Maintains stable 24V at 3A under cold-crank conditions (VIN down to 2.5V), eliminating need for pre-regulator stages. |
Use Scenario: Providing clean, low-noise 12V at 5A for high-resolution automotive cameras with strict EMC requirements. IC Role / Device Role / Timing Role: Phase-modulated dual-channel controller minimizing input ripple and conducted emissions via interleaved switching. Use Value: Achieves <10mVpp output ripple in forced continuous mode, meeting CISPR 25 Class 5 radiated emission limits. |
| Medical Imaging HV Bias | Military Portable Radio Transmitter |
|
Use Scenario: Generating 48V bias voltage for ultrasound transducer arrays from 24V nominal supply. IC Role / Device Role / Timing Role: High-voltage boost controller with precision 1.2V reference and ±1% output accuracy over temperature. Use Value: Delivers 48V @ 1.5A with <0.5% load regulation-critical for consistent acoustic beamforming performance. |
Use Scenario: Powering RF power amplifiers requiring 28V rail from 12V tactical battery with extended runtime. IC Role / Device Role / Timing Role: Dual-output controller supporting burst-mode operation to minimize standby current in receive mode. Use Value: Reduces system quiescent draw to 125µA (single channel active), extending battery life by >3× vs fixed-frequency alternatives. |
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 |
|---|---|---|---|
| LTC3787EUH#PBF | Single-output version; no second channel, no PGOOD2, no SS2/ITH2/SENSE2 pins; identical pinout footprint but reduced functionality. | Suitable only for single-rail systems; cannot support independent dual-output sequencing or redundancy. | Select when only one regulated output is required and board space must be minimized-same layout but lower BOM cost. |
| MP2918GL-Z | Monolithic dual-channel boost IC (integrated MOSFETs); max 30V output; fixed 500kHz frequency; no PLL sync or DCR sensing. | Limited to ≤3A per channel; lacks programmable light-load modes and phase modulation flexibility. | Choose for cost-sensitive, lower-power applications where integration outweighs configurability-no external FETs needed. |
Compared with LTC3787EUH#PBF and MP2918GL-Z, the LTC3788EUH#PBF uniquely supports true dual independent outputs with full feature parity per channel-including separate soft-start, current limit, and power-good-making it the only option for fault-tolerant or multi-rail industrial designs requiring synchronized yet decoupled regulation.
Availability
LTC3788EUH#PBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive ADAS subsystems, and medical imaging equipment requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LTC3788EUH#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, inheriting its high-performance analog and power management portfolio. Linear pioneered precision DC/DC controllers with proprietary architectures like OPTI-LOOP® and Burst Mode®.
The LTC3788EUH#PBF belongs to Linear's PolyPhase® synchronous controller family, designed specifically for high-efficiency, high-current boost applications demanding dual-rail generation, phase interleaving, and robust light-load operation in harsh environments.
FAQ
What is the absolute maximum input voltage rating for the LTC3788EUH#PBF?
The LTC3788EUH#PBF has an absolute maximum VBIAS rating of 40V, with recommended operating range of 4.5V to 38V. The SENSE pins tolerate up to 40V common-mode, and BOOST/SW pins withstand 76V/70V respectively-enabling safe operation during load-dump transients in automotive applications. Always observe derating guidelines per the datasheet's Absolute Maximum Ratings table.
How does the ILIM pin configure current limit thresholds on the LTC3788EUH#PBF?
The ILIM pin on the LTC3788EUH#PBF selects three factory-trimmed current sense thresholds: grounding sets 50mV, floating sets 75mV, and connecting to INTVCC sets 100mV. These correspond to peak inductor current trip points calibrated against the internal 1.2V reference and error amplifier gain-allowing precise overcurrent protection without external resistors.
Can the LTC3788EUH#PBF operate with only one channel enabled?
Yes-the LTC3788EUH#PBF supports independent channel control via RUN1 and RUN2 pins. Pulling RUN1 low disables Channel 1 while Channel 2 remains fully functional with its own VFB, ITH, SS, and PGOOD signals. Quiescent current drops to 125µA in this configuration, making it ideal for asymmetric power architectures.
What is the purpose of the PHASMD pin on the LTC3788EUH#PBF?
The PHASMD pin on the LTC3788EUH#PBF configures the phase relationship between BG1 and BG2: floating yields 180° interleaving, tying to SGND gives 240°, and connecting to INTVCC forces 0° (in-phase). This enables optimization of input/output ripple cancellation and thermal distribution across dual-phase designs without changing external components.
Does the LTC3788EUH#PBF support both RSENSE and inductor DCR current sensing?
Yes-the LTC3788EUH#PBF natively supports both methods. RSENSE connects between SENSE+ and SENSE− with Kelvin routing; DCR sensing uses the same pins with RC network (R = DCR, C = 1/(2πf×ESR)) to compensate for inductor impedance phase shift. Both achieve accurate cycle-by-cycle current limiting with <±5% tolerance across temperature.
LTC3788EUH#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)
LTC3788EUH#PBF FAQ
1.How can I place an order for LTC3788EUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3788EUH#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 LTC3788EUH#PBF reliable?
The price and inventory of LTC3788EUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3788EUH#PBF is usually 5 days.
3.What payment methods are accepted for LTC3788EUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3788EUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3788EUH#PBF?
LTC3788EUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3788EUH#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 LTC3788EUH#PBF?
For technical support, including LTC3788EUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3788EUH#PBF requirements.
6.How does Aetrix verify that LTC3788EUH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3788EUH#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 LTC3788EUH#PBF meets industry standards.
7.What is the process for return or replacement of LTC3788EUH#PBF?
All LTC3788EUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3788EUH#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 LTC3788EUH#PBF part is unused and in its original packaging.
Return procedure for LTC3788EUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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