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Analog Devices Inc. LTC3890MPGN-1#PBF
- Part No.:
- LTC3890MPGN-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3890MPGN-1#PBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,326
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Product details
Overview
LTC3890MPGN-1#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, dual-phase synchronous step-down DC/DC controller designed for automotive and industrial power systems. It supports 4V–60V input, delivers two independent outputs (e.g., 3.3V/5A and 8.5V/3A), operates with 50µA quiescent current in single-channel sleep mode, and features out-of-phase operation to reduce input ripple. It is used in battery-powered digital devices requiring stable low-IQ regulation.
For engineers reviewing the LTC3890MPGN-1#PBF datasheet, LTC3890MPGN-1#PBF pinout, LTC3890MPGN-1#PBF application, or LTC3890MPGN-1#PBF equivalent, key selection criteria include its –55°C to 150°C extended temperature grade, dual-channel phase-lockable frequency (75kHz–850kHz), RSENSE/DCR current sensing, and programmable light-load modes (Burst Mode®, pulse-skipping, or forced continuous).
Technical Context
The LTC3890MPGN-1#PBF implements a constant-frequency current-mode architecture with two independent 180° out-of-phase controllers, minimizing input capacitor requirements and supply-induced noise. Each channel uses an error amplifier (EA) with OPTI-LOOP® compensation, a transconductance gm of 2 mmho, and ITH-controlled peak current limiting via differential SENSE+/- inputs.
It integrates dual N-channel MOSFET gate drivers (TG/BG) with 2.5Ω pull-up and 1.5Ω pull-down on TG, 2.4Ω/1.1Ω on BG, and supports bootstrapped top-side drive via BOOST pins. Internal INTVCC LDO (5.1V ±3%) can be powered from VIN or external EXTVCC (≥4.7V), enabling high-efficiency self-biasing from output rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports wide battery chemistries (12V/24V/48V systems) and intermediate bus voltages without external pre-regulation. |
| Quiescent Current (1 ch active) | 50µA - enables multi-year operation in always-on automotive modules and remote IoT sensors. |
| Output Voltage Range | 0.8V to 24V - configurable for logic rails (3.3V/5V), analog supplies (±12V), or auxiliary bias (8.5V) using external resistor dividers. |
| Switching Frequency Range | 75kHz to 850kHz - adjustable via FREQ pin resistor or external clock; out-of-phase operation halves effective input ripple frequency. |
| Operating Temperature | –55°C to 150°C - qualified for under-hood automotive, aerospace, and harsh industrial environments per MP-grade specification. |
| Current Sensing | RSENSE or DCR - supports precision lossless inductor sensing or low-cost shunt-based current monitoring with 64–85mV max sense threshold. |
| Light-Load Modes | Burst Mode®, pulse-skipping, or forced continuous - selectable via PLLIN/MODE pin to optimize efficiency vs. noise vs. transient response trade-offs. |
Pinout & Package
Package: 28-lead plastic SSOP (GN), 5.6mm × 10.2mm, exposed pad not present. RoHS-compliant lead-free finish (Pb-free, NiPdAu plating). Thermal resistance θJA = 90°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH1, ITH2 (1, 13) | Error amplifier output / current limit control | Directly sets peak inductor current per channel; connects to compensation network for loop stability. |
| VFB1, VFB2 (2, 12) | Feedback input | Monitors regulated output via external resistor divider; internal 0.800V reference ensures ±0.5% output accuracy over temp. |
| SENSE1+, SENSE2+ (3, 11) | Current sense positive input | Connects to high-side of RSENSE or DCR network; differential pair with SENSE– enables accurate current measurement. |
| SENSE1–, SENSE2– (4, 10) | Current sense negative input | Reference point for current comparator; bias current ≤±1µA minimizes offset errors in precision sensing. |
| FREQ (5) | Frequency programming | Resistor-to-GND sets VCO frequency (50–900kHz); internal 20µA current source enables simple one-resistor tuning. |
| PLLIN/MODE (6) | Synchronization & light-load mode select | Accepts external clock for phase-locking or DC voltage to choose Burst Mode® (GND), pulse-skipping (1.2–3.8V), or forced CCM (INTVCC). |
| RUN1, RUN2 (8, 9) | Independent enable control | Digital shutdown inputs; <1.15V disables respective channel; both <0.7V enters ultra-low-IQ shutdown (<14µA). |
| TRACK/SS1, TRACK/SS2 (14, 28) | Soft-start / tracking control | Internal 1µA pull-up charges external capacitor for linear soft-start; also accepts external voltage for output tracking during power-up. |
| PGOOD1 (27) | Power-good monitor | Open-drain output asserting when VFB1 deviates >±10% from setpoint; enables system sequencing and fault detection. |
| TG1, TG2 (15, 26) | Top N-MOSFET gate driver | Floating high-side drivers with ~25ns rise/fall; swing = SW + (INTVCC – 0.5V) enables efficient bootstrap operation. |
| BG1, BG2 (18, 23) | Bottom N-MOSFET gate driver | Ground-referenced drivers with 1.1Ω pull-down; complements TG to form synchronous rectification with minimal conduction loss. |
| BOOST1, BOOST2 (17, 24) | Bootstrap supply | Charged via external diode/capacitor from INTVCC; provides floating rail for TG drivers during high-duty-cycle operation. |
| SW1, SW2 (16, 25) | Switch node | Connects to inductor and MOSFET bridge; requires low-inductance layout to minimize EMI and switching losses. |
| VIN (22) | Main input supply | Primary power path for INTVCC LDO and internal circuitry; absolute max 65V allows surge margin in automotive applications. |
| EXTVCC (20) | External bias input | Enables bypass of VIN LDO when ≥4.7V applied; reduces power loss and heat generation when powering from regulated output rail. |
| INTVCC (19) | Internal LDO output | 5.1V ±3% regulated supply for gate drivers and control logic; requires ≥4.7µF ceramic decoupling at pin. |
| PGND (21) | Power ground | High-current return path for bottom MOSFETs and input capacitors; must be separated from SGND to avoid noise coupling. |
| SGND (7) | Signal ground | Reference for feedback, error amp, and logic circuits; routed separately from PGND to maintain ADC and EA accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual controllers | Reduces required input capacitance by ~50% and cuts input ripple amplitude versus single-phase designs. |
| OPTI-LOOP® compensation | Allows stable loop response across wide range of output capacitor ESR (0.5mΩ–100mΩ) and capacitance (10µF–1000µF). |
| 99% maximum duty cycle | Enables operation in dropout (VIN ≈ VOUT), critical for cold-crank automotive scenarios where input drops to 4.5V. |
| Adjustable soft-start/tracking | Single external capacitor per channel enables precise ramp time control or seamless sequencing with other power rails. |
| Output overvoltage protection | Hardware-based VOVL circuit triggers shutdown if VFB exceeds regulated value by >7–13%, protecting downstream loads. |
| Low shutdown IQ (<14µA) | Supports long-term storage and battery backup modes without significant drain on primary energy sources. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Dual-rail power for SoC (3.3V core) and display interface (8.5V backlight) in head-unit systems operating across –40°C to 125°C ambient. IC Role / Device Role / Timing Role: Primary dual-output buck controller managing start-up sequencing, load transients, and cold-crank survival. Use Value: 50µA quiescent current extends battery life during vehicle off-state; 60V abs max rating handles 12V system load-dump surges. |
Use Scenario: Distributed 24V-to-5V/3.3V conversion in modular PLC backplane with multiple isolated I/O cards. IC Role / Device Role / Timing Role: Centralized high-efficiency DC/DC controller delivering tightly regulated rails to field-side logic and analog signal conditioning. Use Value: Out-of-phase operation suppresses conducted EMI into sensitive analog acquisition paths; RSENSE sensing enables precise current limiting per module. |
| Avionics Remote Sensor Hub | Ruggedized Edge AI Gateway |
Use Scenario: Power management for MEMS inertial sensors and GPS receivers in UAV flight controllers requiring –55°C startup and radiation-tolerant design. IC Role / Device Role / Timing Role: MP-grade controller providing fault-tolerant dual outputs with PGOOD monitoring and OVP for safety-critical subsystems. Use Value: –55°C to 150°C qualification meets DO-160 environmental test requirements; 14µA shutdown IQ preserves battery during extended standby. |
Use Scenario: High-density edge computing node with FPGA, AI accelerator, and wireless comms (LTE/5G), all demanding clean, sequenced power rails. IC Role / Device Role / Timing Role: Dual-phase controller enabling compact, low-noise power delivery while supporting dynamic voltage scaling via ITH control. Use Value: Programmable light-load modes allow burst operation for idle periods and forced CCM for real-time inference bursts-optimizing thermal and acoustic performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3890HGN-1#PBF | Same functionality and pinout; rated for –40°C to 150°C (not –55°C). | Suitable for standard automotive under-hood use but not extreme cold-start or aerospace deployments. | Select when full MP-grade temperature range is unnecessary and cost optimization is prioritized. |
| MP2918GL-Z | Single-chip dual-phase controller with integrated MOSFETs; lower Vin range (4.5V–36V); no EXTVCC option. | Targets space-constrained consumer/industrial apps; lacks 60V capability and ultra-low-IQ sleep mode. | Choose for simplified BOM and layout where input voltage stays below 36V and efficiency at microamp loads is secondary. |
Compared with LTC3890HGN-1#PBF and MP2918GL-Z, the LTC3890MPGN-1#PBF uniquely combines –55°C cold-start capability, 60V input tolerance, and 50µA single-channel quiescent current-making it the only option qualified for mission-critical avionics and extended-temperature industrial control.
Availability
LTC3890MPGN-1#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, and avionics sensor hubs requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LTC3890MPGN-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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3890MPGN-1#PBF belongs to ADI's Power by Linear™ high-voltage controller family, engineered specifically for robust, low-quiescent-current DC/DC conversion in automotive, aerospace, and industrial applications demanding reliability across extreme temperatures.
FAQ
What is the operating temperature range of the LTC3890MPGN-1#PBF?
The LTC3890MPGN-1#PBF is specified for operation from –55°C to 150°C junction temperature, making it suitable for under-hood automotive, aerospace, and harsh industrial environments. This MP-grade qualification exceeds standard automotive (–40°C to 125°C) and high-temp industrial (–40°C to 150°C) requirements, enabling reliable cold-crank startup and sustained high-temperature operation.
How does the LTC3890MPGN-1#PBF achieve ultra-low quiescent current?
The LTC3890MPGN-1#PBF achieves 50µA quiescent current with one channel active and <14µA in full shutdown by integrating sleep-mode circuitry that disconnects the error amplifier output (ITH), disables gate drivers, and powers down non-essential blocks. Its proprietary Burst Mode® operation maintains regulation while minimizing switching losses during light loads, extending battery life in always-on systems.
Can the LTC3890MPGN-1#PBF synchronize to an external clock?
Yes, the LTC3890MPGN-1#PBF supports external synchronization via the PLLIN/MODE pin. When an external clock signal is applied, its internal phase-locked loop aligns the rising edge of TG1 with the external clock's rising edge. This feature enables noise-sensitive systems (e.g., RF or audio circuits) to avoid beat frequencies and simplifies EMI filtering by fixing the switching frequency.
What current sensing methods does the LTC3890MPGN-1#PBF support?
The LTC3890MPGN-1#PBF supports both RSENSE (shunt resistor) and DCR (inductor winding resistance) current sensing via differential SENSE+ and SENSE– inputs. It provides a programmable current sense threshold (64–85mV) and low input bias current (±1µA on SENSE–), ensuring accurate current limiting and cycle-by-cycle protection across temperature and load conditions.
Does the LTC3890MPGN-1#PBF include output overvoltage protection?
Yes, the LTC3890MPGN-1#PBF includes hardware-based output overvoltage protection (VOVL) that monitors the VFB1 and VFB2 pins. If feedback voltage exceeds the regulated setpoint by 7–13%, the controller shuts down both channels and holds the outputs in a safe state until reset via RUN pins-protecting downstream FPGAs, processors, and analog ICs from destructive overvoltage events.
LTC3890MPGN-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-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 60V
- Frequency - Switching:
- 105kHz ~ 835kHz, 350kHz ~ 535kHz
- Duty Cycle (Max):
- 99%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Power Good, Soft Start, Tracking
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC3890MPGN-1#PBF FAQ
1.How can I place an order for LTC3890MPGN-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3890MPGN-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 LTC3890MPGN-1#PBF reliable?
The price and inventory of LTC3890MPGN-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 LTC3890MPGN-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3890MPGN-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3890MPGN-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3890MPGN-1#PBF?
LTC3890MPGN-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3890MPGN-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 LTC3890MPGN-1#PBF?
For technical support, including LTC3890MPGN-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3890MPGN-1#PBF requirements.
6.How does Aetrix verify that LTC3890MPGN-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3890MPGN-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 LTC3890MPGN-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3890MPGN-1#PBF?
All LTC3890MPGN-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3890MPGN-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 LTC3890MPGN-1#PBF part is unused and in its original packaging.
Return procedure for LTC3890MPGN-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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