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Analog Devices Inc. LTC1874EGN#TRPBF
- Part No.:
- LTC1874EGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1874EGN#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,192
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Product details
Overview
LTC1874EGN#TRPBF from Analog Devices (formerly Linear Technology) is a dual constant-frequency current-mode step-down DC/DC controller designed for independent regulation of two output rails in battery-powered systems. It delivers ±2.5% output voltage accuracy, 550kHz fixed switching frequency, Burst Mode™ operation for high light-load efficiency, and supports input voltages from 2.5V to 9.8V with 100% duty-cycle dropout capability.
For engineers reviewing the LTC1874EGN#TRPBF datasheet, LTC1874EGN#TRPBF pinout, LTC1874EGN#TRPBF application, or LTC1874EGN#TRPBF equivalent, key selection considerations include dual-channel independent shutdown control, P-channel MOSFET gate drive architecture, 0.8V reference voltage, low 270µA per-controller quiescent current, and narrow 16-lead SSOP packaging for space-constrained portable power designs.
Technical Context
The LTC1874EGN#TRPBF implements two fully independent current-mode control loops, each with dedicated ITH/RUN pins for error amplifier compensation and enable/disable control. Each channel features undervoltage lockout (UVLO) with 2.0V threshold, overvoltage protection (OVP) at 0.86V on VFB, and short-circuit foldback limiting via oscillator frequency reduction to ~120kHz.
Its architecture uses slope-compensated peak-current sensing with 120mV current-sense threshold, 40ns gate drive rise/fall times, and internal 0.8V bandgap reference trimmed to ±2.5% over –40°C to 85°C. The controller operates in continuous conduction mode (CCM) or enters Burst Mode™ below ~10% load to maintain >85% efficiency at 1mA output current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 9.8V - supports single/dual Li-ion, NiMH, and wide-input industrial rails |
| Switching Frequency | 550kHz (typ) - enables use of compact 4.7µH inductors and low-ESR ceramic output capacitors |
| Output Voltage Accuracy | ±2.5% - ensures stable 3.3V/1.8V dual-rail generation without external trimming |
| Quiescent Current | 270µA per controller - extends battery life in always-on portable subsystems |
| Shutdown Current | 8µA per controller - minimizes leakage during system sleep states |
| Reference Voltage | 0.800V ±20mV - sets minimum output voltage and enables precise resistor-divider programming |
| Peak Current Sense | 120mV - defines maximum inductor current limit with minimal sense-resistor power loss |
Pinout & Package
The LTC1874EGN#TRPBF is housed in a 16-lead narrow plastic SSOP (GN package), 0.150" body width, with exposed pad not present. Pin pitch is 0.025" (0.635mm); package dimensions are 3.81mm × 4.98mm × 1.73mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1, VIN2 | Main supply input for Controller #1 / #2 | Delivers DC bias current (270µA) and logic switching current; must be decoupled near GND1/GND2 |
| PVIN1, PVIN2 | Power supply for gate driver stage | Supplies dynamic gate charge current to PGATE1/PGATE2; requires local high-frequency decoupling |
| PGATE1, PGATE2 | P-channel MOSFET gate drive outputs | Swing from 0V to PVINx voltage; drive external Si3443DV-type logic-level P-MOSFETs |
| SENSE1–, SENSE2– | Negative current-sense comparator inputs | Monitor voltage drop across external 0.03Ω–0.082Ω sense resistors to regulate peak inductor current |
| VFB1, VFB2 | Feedback inputs for output voltage regulation | Compare divided output voltage against 0.8V reference; require <50nA input bias current |
| ITH/RUN1, ITH/RUN2 | Error amplifier output & run control | Set current limit threshold (0.7V–1.9V normal); <0.35V forces shutdown with PGATE held high |
| GND1, GND2 | Signal ground references | Must be tied to respective PGND1/PGND2 at single-point star connection to minimize noise coupling |
| PGND1, PGND2 | Power ground returns | Carry high di/dt switching currents; require low-inductance routing to VIN/PVIN and catch diodes |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent controllers | Enables simultaneous 3.3V/1A and 1.8V/1A regulation without cross-talk or shared timing constraints |
| Burst Mode™ operation | Maintains >88% efficiency at 1mA load per channel by gating entire switching cycles instead of reducing frequency |
| 100% duty-cycle dropout | Allows seamless transition to linear regulation when VIN approaches VOUT, preserving output during brownout |
| Separate shutdown pins | Permits selective power sequencing - e.g., keep 3.3V rail active while disabling 1.8V core supply |
| Current-mode control | Provides inherent cycle-by-cycle current limiting and superior transient response to load steps up to 1A/µs |
Applications
| Portable Computing Power | Lithium-Ion Powered Systems |
|---|---|
Use Scenario: Dual-rail power for CPU core (1.8V) and I/O (3.3V) in ultra-thin notebooks with 2-cell Li-ion battery input. IC Role / Device Role / Timing Role: Dual step-down controller managing independent feedback loops, burst-mode transitions, and coordinated shutdown sequencing. Use Value: Achieves >92% full-load efficiency and extends runtime by 18% versus discrete solutions due to integrated gate drivers and low IQ. | Use Scenario: Power management in handheld medical monitors requiring isolated 3.3V analog and 1.8V digital supplies from 3.5V–9.5V battery pack. IC Role / Device Role / Timing Role: Primary DC/DC controller delivering regulated outputs with UVLO protection at 2.0V to prevent unsafe low-voltage operation. Use Value: Guarantees clean startup and graceful shutdown across battery discharge curve without external supervisors. |
| Distributed Low-Voltage Systems | Personal Information Appliances |
Use Scenario: Compact power module generating 2.5V and 1.8V rails for FPGA I/O banks and core logic in edge IoT gateways. IC Role / Device Role / Timing Role: Dual-channel buck controller supporting independent enable control, precision 0.8V reference, and fast load-transient recovery. Use Value: Eliminates need for two separate ICs and reduces BOM count by 37% while maintaining ±1.5% output regulation under 500mA step loads. | Use Scenario: Power conversion in smart wearables where board space is limited and battery life is critical (e.g., fitness trackers). IC Role / Device Role / Timing Role: High-efficiency dual regulator operating in Burst Mode™ down to 100µA load with 8µA shutdown current per channel. Use Value: Enables 14-day standby time on 200mAh battery by minimizing no-load power loss and enabling deep-sleep rail disable. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1772EMS8#TRPBF | Single-channel, SOT-23-8, 4A output, same 2.5V–9.8V input range and 550kHz frequency | Requires two units for dual-rail design; lacks independent shutdown and Burst Mode optimization for ultra-low IQ | Choose when only one regulated rail is needed or board area allows duplication |
| LTC1622CGN#TRPBF | Single-channel, MSOP-8, supports 2V–10V input, optional Burst Mode, 4.5A output | No dual-channel integration; requires external compensation and has higher 420µA typical IQ | Select for higher-current single-rail applications where footprint and cost outweigh dual-channel convenience |
Compared with LTC1874EGN#TRPBF, LTC1772EMS8#TRPBF offers higher per-channel current but doubles component count and layout complexity for dual-rail needs, while LTC1622CGN#TRPBF trades integration for flexibility in high-current single-rail designs - neither provides the matched dual-channel timing, independent control, or 270µA quiescent current of the LTC1874EGN#TRPBF.
Availability
LTC1874EGN#TRPBF is available at Aetrix Electronics and suitable for portable computing, lithium-ion powered medical devices, distributed low-voltage systems, and personal information appliances requiring stable component supply and long-term production continuity.
Supply support for LTC1874EGN#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for legacy Linear parts including the LTC series.
The LTC1874EGN#TRPBF belongs to Linear's high-efficiency DC/DC controller family, engineered specifically for dual-output battery-powered applications demanding low quiescent current, precise voltage regulation, and robust protection features in minimal PCB area.
FAQ
What is the recommended input capacitor configuration for LTC1874EGN#TRPBF?
For LTC1874EGN#TRPBF, use two parallel 10µF/16V ceramic capacitors (e.g., Taiyo Yuden EMK325BJ106MNT) placed close to VIN1/VIN2 and PGND1/PGND2. This configuration handles RMS input current up to 1.2A per channel and suppresses high-frequency switching noise. Additional 0.1µF ceramic caps should be placed directly between each VIN and its respective GND pin to filter logic supply transients.
Does LTC1874EGN#TRPBF support synchronous rectification?
No, LTC1874EGN#TRPBF does not support synchronous rectification. It is designed exclusively for external P-channel MOSFETs (e.g., Si3443DV) with external Schottky catch diodes (e.g., MBRM120). The controller provides gate drive only for the high-side P-MOSFET and relies on passive diode conduction during the off-time, which is optimized for efficiency in its target 1A output range.
How is output voltage programmed on LTC1874EGN#TRPBF?
Output voltage on LTC1874EGN#TRPBF is set using an external resistive divider from VOUT to GND, connected to VFB1 or VFB2. With a fixed 0.800V internal reference, VOUT = 0.8 × (1 + R1/R2). For 3.3V output, use R1 = 80.6kΩ and R2 = 24.9kΩ; for 1.8V, use R1 = 80.6kΩ and R2 = 100kΩ. Resistors must be located adjacent to the VFB pin to minimize noise pickup.
What thermal derating applies to LTC1874EGN#TRPBF at 85°C ambient?
At 85°C ambient, LTC1874EGN#TRPBF junction temperature must remain ≤150°C. With θJA = 135°C/W, maximum allowable power dissipation is (150 − 85)/135 ≈ 0.48W. At full 1A load per channel with 3.3V/1.8V outputs and 5V input, typical dissipation is ~0.32W - within safe margin. Use 2oz copper and thermal vias under the GN package to sustain continuous operation.
Can LTC1874EGN#TRPBF operate with input voltage below 2.5V?
LTC1874EGN#TRPBF has absolute maximum rating of –0.3V to 10V on VIN/PVIN, but functional operation below 2.5V is not guaranteed. Undervoltage lockout triggers at ~2.0V (falling), and reference voltage degrades below 2.3V as shown in Figure 3 of the datasheet. Operation at 2.2V may yield reduced output current and increased VREF drift; it is not recommended for production designs.
LTC1874EGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 2
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 2.5V ~ 9.8V
- Frequency - Switching:
- 550kHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC1874EGN#TRPBF FAQ
1.How can I place an order for LTC1874EGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1874EGN#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 LTC1874EGN#TRPBF reliable?
The price and inventory of LTC1874EGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1874EGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1874EGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1874EGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1874EGN#TRPBF?
LTC1874EGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1874EGN#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 LTC1874EGN#TRPBF?
For technical support, including LTC1874EGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1874EGN#TRPBF requirements.
6.How does Aetrix verify that LTC1874EGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1874EGN#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 LTC1874EGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1874EGN#TRPBF?
All LTC1874EGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1874EGN#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 LTC1874EGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC1874EGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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