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Analog Devices Inc. LTC1874EGN#PBF
- Part No.:
- LTC1874EGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1874EGN#PBF.pdf
- Description:
- IC REG CTRLR BUCK 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,551
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Product details
Overview
LTC1874EGN#PBF 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 space-constrained, battery-powered systems. It delivers ±2.5% output voltage accuracy, 550kHz fixed switching frequency, and operates across 2.5V–9.8V input with 0.8V internal reference - enabling precise 1.8V/1A and 3.3V/1A outputs in portable computing and lithium-ion-powered instrumentation.
For engineers reviewing the LTC1874EGN#PBF datasheet, LTC1874EGN#PBF pinout, LTC1874EGN#PBF application, or LTC1874EGN#PBF equivalent, key selection considerations include per-controller shutdown control, Burst Mode™ operation for light-load efficiency, 100% duty-cycle dropout capability, and dual-channel independence with shared thermal design constraints in the 16-lead narrow SSOP package.
Technical Context
The LTC1874EGN#PBF implements two fully independent current-mode control loops, each with dedicated ITH/RUN pins for error amplifier compensation and run control, separate PGATE/PGND/VIN/PVIN paths, and individual undervoltage lockout (UVLO) thresholds at 2.0V (typ). Each channel uses slope-compensated peak-current sensing referenced to SENSE–, with 120mV current-sense threshold and 0.8V precision bandgap reference.
It supports high-efficiency operation via Burst Mode™ (enabling up to 94% peak efficiency), low-quiescent-current sleep mode (230µA typ per controller), and 8µA shutdown current. Oscillator frequency remains stable at 550kHz (±10%) over temperature and line, with short-circuit protection reducing frequency to ~120kHz to limit inductor current runaway.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 9.8V - supports single/dual Li-ion, 3.3V/5V system rails, and wide-input industrial supplies. |
| Switching Frequency | 550kHz (typ) - enables use of compact 4.7µH inductors and ceramic input/output capacitors. |
| Output Voltage Accuracy | ±2.5% over –40°C to 85°C - ensures stable 1.8V/3.3V rail regulation without external trimming. |
| Quiescent Current | 270µA per controller (typ) - extends battery life in always-on subsystems and low-power standby modes. |
| Shutdown Current | 8µA per controller - minimizes leakage during deep sleep or system power gating. |
| Reference Voltage | 0.800V ±20mV (–40°C to 85°C) - sets output via external resistor divider; enables sub-1V outputs with proper scaling. |
| UVLO Threshold | 2.0V (falling), hysteresis 0.45V - prevents erratic startup/shutdown near battery depletion. |
Pinout & Package
The LTC1874EGN#PBF is housed in a 16-lead narrow plastic SSOP (GN package), 0.150" body width, with exposed pad not electrically connected. Pin pitch is 0.025" (0.635mm); lead thickness 0.008–0.012". Thermal resistance θJA = 135°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1, VIN2 | Main supply inputs for controllers #1 and #2 | Deliver DC bias current (270µA each) and logic switching current; must be decoupled locally to GND1/GND2. |
| PVIN1, PVIN2 | Power supply inputs for gate drivers | Source dynamic gate charge current to PGATE1/PGATE2; require low-ESR bulk capacitance near MOSFET source. |
| PGATE1, PGATE2 | High-side P-MOSFET gate drivers | 0V to PVIN swing, 1A peak drive, 40ns rise/fall - directly drives Si3443DV-class logic-level P-channel devices. |
| SENSE1–, SENSE2– | Negative current-sense inputs | Monitor voltage drop across external sense resistors (e.g., 0.04Ω); referenced to VINx for accurate peak-current detection. |
| VFB1, VFB2 | Feedback inputs | Compare output divider voltage against 0.8V reference; input bias <50nA enables high-impedance dividers (e.g., 80.6k/249k). |
| ITH/RUN1, ITH/RUN2 | Error amp output & run control | Set current limit threshold; <0.35V forces shutdown; 0.7–1.9V range enables soft-start and loop compensation. |
| GND1, GND2 | Signal ground references | Must tie to respective PGNDx pins; separate grounding prevents noise coupling between channels. |
| PGND1, PGND2 | Power ground returns | Carry high di/dt switch-node return current; require low-inductance connection to input capacitor negative terminal. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent controllers | Each channel operates autonomously - no shared timing, feedback, or fault propagation; enables asymmetric rail sequencing. |
| Burst Mode™ operation | Reduces light-load quiescent current to 230µA while maintaining regulation; eliminates audible coil whine in portable audio systems. |
| 100% duty-cycle dropout | Extends usable battery range by sustaining output as input drops to VOUT + RDS(on)·IOUT + IOUT·RSENSE. |
| Per-channel shutdown control | ITH/RUNx < 0.35V disables respective controller - enables dynamic rail gating in multi-voltage SoC power domains. |
| Overvoltage protection (OVP) | Shuts off PGATE if VFB exceeds 0.86V (7.5% above reference); 20mV hysteresis prevents chatter during transients. |
Applications
| Portable Computing Power | Lithium-Ion Instrumentation |
|---|---|
Use Scenario: Dual-rail power for CPU core (1.8V) and I/O (3.3V) in ultra-thin notebooks with single-cell Li-ion battery. IC Role / Device Role / Timing Role: Dual step-down controller managing independent load transients, burst-mode efficiency during idle, and seamless dropout during battery sag. Use Value: Eliminates need for two discrete controllers; 550kHz operation allows 4.7µH inductors and 47µF POSCAP outputs - saving >25mm² PCB area. |
Use Scenario: Precision data acquisition module powered by 2-cell Li-ion (6–8.4V), requiring clean 3.3V analog and 1.8V digital rails. IC Role / Device Role / Timing Role: Regulates both rails with ±2.5% accuracy and low 270µA quiescent current per channel to maximize runtime between calibrations. Use Value: Independent UVLO and shutdown pins allow staged power-up; low-noise current-mode control minimizes ADC reference ripple. |
| Distributed Low-Voltage Systems | Industrial Handheld Terminals |
Use Scenario: Field-deployable sensor node with isolated 3.3V logic and 1.8V RF transceiver, powered from 9V primary battery. IC Role / Device Role / Timing Role: Dual buck controller delivering regulated outputs while supporting 100% duty cycle to extend operational time as battery discharges to 3.5V. Use Value: Single-chip solution reduces BOM count vs. discrete regulators; SSOP package enables automated assembly on dense 4-layer boards. |
Use Scenario: Ruggedized barcode scanner using 3.7V Li-ion, requiring 3.3V microcontroller and 1.8V display driver with fast transient response. IC Role / Device Role / Timing Role: Provides tightly coupled dual outputs with independent soft-start via ITH/RUN ramp; current-mode architecture ensures <50µs load-step recovery. Use Value: Burst Mode™ maintains >85% efficiency at 10mA load - critical for intermittent scan operation extending battery life beyond 12 hours. |
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#PBF | Single-channel, SOT-23-8, 4A output, same 2.5V–9.8V input and 550kHz frequency. | Requires two units for dual-rail designs; lacks per-channel shutdown and independent UVLO. | Choose when board space permits discrete duplication and only one rail requires high current. |
| LTC1622CGN#PBF | Single-channel, MSOP-8, supports up to 4.5A, optional Burst Mode, 2V–10V input. | No second channel; different pinout and compensation scheme; higher max current but lower light-load efficiency. | Select for cost-sensitive single-rail systems needing >2A output or wider VIN range down to 2V. |
Compared with LTC1874EGN#PBF, LTC1772EMS8#PBF offers higher per-channel current but doubles component count for dual outputs, while LTC1622CGN#PBF provides greater flexibility in single-rail high-current designs but sacrifices integrated dual-channel coordination and matched thermal behavior.
Availability
LTC1874EGN#PBF is available at Aetrix Electronics and suitable for portable computing, lithium-ion instrumentation, distributed low-voltage systems, and industrial handheld terminals requiring stable component supply with long-term lifecycle support.
Supply support for LTC1874EGN#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 and maintains full technical and manufacturing continuity for legacy Linear power products including the LTC1874 series.
The LTC1874EGN#PBF belongs to Linear's high-efficiency current-mode DC/DC controller product line, engineered specifically for dual-output, battery-operated applications demanding low quiescent current, precise regulation, and robust transient response in minimal footprint.
FAQ
What is the maximum output current supported by each channel of the LTC1874EGN#PBF?
Each channel of the LTC1874EGN#PBF supports up to 1A output current in typical reference designs (e.g., Figure 1: 3.3V/1A and 1.8V/1A). The actual achievable current depends on external components - particularly the P-channel MOSFET's RDS(on), sense resistor value, inductor saturation current, and thermal layout. With optimized layout and Si3443DV MOSFETs, sustained 1A per channel is verified across –40°C to 85°C ambient.
Does the LTC1874EGN#PBF support synchronization to an external clock?
No, the LTC1874EGN#PBF does not support external clock synchronization. Its oscillator is internally fixed at 550kHz (500–650kHz over conditions) and lacks a SYNC pin or frequency-adjust capability. For synchronized dual-channel operation, consider alternatives like LTC1628 or LTC3728, which provide master/slave clocking and phase interleaving.
Can the LTC1874EGN#PBF operate with input voltages below 2.5V?
The LTC1874EGN#PBF has an absolute minimum input rating of 2.5V per the datasheet's recommended operating conditions, though its UVLO threshold is 2.0V (min). Operation below 2.5V is not guaranteed: reference voltage degrades below 2.3V (Figure 3), and maximum output current falls significantly below 3V. For sub-2.5V operation, LTC1773 or LTC1877 are specified alternatives.
What is the purpose of the separate VIN and PVIN pins on the LTC1874EGN#PBF?
VIN (pins 1 and 9) supplies the controller's bias circuitry and logic (270µA quiescent), while PVIN (pins 16 and 8) supplies only the high-current gate drive for the external P-MOSFET. Separating these paths prevents gate-switching noise from modulating the reference or error amplifier, improving regulation accuracy and EMI performance - especially critical in sensitive analog or RF subsystems powered by the same LTC1874EGN#PBF.
How does Burst Mode™ operation affect output voltage ripple on the LTC1874EGN#PBF?
In Burst Mode™, the LTC1874EGN#PBF reduces switching frequency and delivers energy in discrete bursts, increasing low-frequency output ripple (typically 10–30mVPP at light loads) compared to continuous mode (<5mVPP). This trade-off enables 230µA quiescent current. For noise-sensitive analog rails, designers can disable Burst Mode™ via ITH/RUN biasing above 1.9V - reverting to forced continuous operation with higher IQ but lower ripple.
LTC1874EGN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-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:
- 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#PBF FAQ
1.How can I place an order for LTC1874EGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1874EGN#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 LTC1874EGN#PBF reliable?
The price and inventory of LTC1874EGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1874EGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC1874EGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1874EGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1874EGN#PBF?
LTC1874EGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1874EGN#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 LTC1874EGN#PBF?
For technical support, including LTC1874EGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1874EGN#PBF requirements.
6.How does Aetrix verify that LTC1874EGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1874EGN#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 LTC1874EGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC1874EGN#PBF?
All LTC1874EGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1874EGN#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 LTC1874EGN#PBF part is unused and in its original packaging.
Return procedure for LTC1874EGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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