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Analog Devices Inc. LTC1879EGN#TRPBF
- Part No.:
- LTC1879EGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1879EGN#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.2A 16SSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC1879EGN#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC regulator with constant-frequency current-mode control, 1.2A output capability, 15µA quiescent current in Burst Mode, and 550kHz nominal switching frequency. It delivers regulated output voltages from 0.8V to VIN across a 2.65V–10V input range and integrates dual P-channel/N-channel MOSFETs for high-efficiency power conversion in portable Li-ion battery systems.
For engineers reviewing the LTC1879EGN#TRPBF datasheet, LTC1879EGN#TRPBF pinout, LTC1879EGN#TRPBF application, or LTC1879EGN#TRPBF equivalent, key selection criteria include its true PLL-based external synchronization (350–750kHz), ±2% output voltage accuracy over temperature, Power Good monitoring, low-dropout 100% duty cycle operation, and integrated thermal/overcurrent protection - all in a thermally enhanced 16-lead SSOP package.
Technical Context
The LTC1879EGN#TRPBF implements a current-mode architecture with internal slope compensation above 40% duty cycle to prevent subharmonic oscillation. Its dual-switch topology uses an integrated P-channel upper switch (RDS(ON) = 0.45Ω typ at 5V) and N-channel lower switch (RDS(ON) = 0.5Ω typ at 5V), enabling synchronous rectification without external diodes.
It features a true analog phase-locked loop for precise external clock synchronization, where the PLL_LPF pin voltage adjusts dynamically to match phase and frequency of an external 350–750kHz source. The RUN/SS pin provides programmable soft-start and shutdown (<1µA IQ), while the SYNC/MODE pin selects between Burst Mode (15µA IQ), pulse-skipping mode (365µA IQ), or external sync - with Burst Mode disabled during synchronization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.65V to 10V - supports single/dual Li-ion battery inputs without pre-regulation |
| Output Voltage Range | 0.8V to VIN - adjustable via resistor divider; 0.8V reference enables low-voltage core rails |
| Max Output Current | 1.2A continuous - limited by internal MOSFET RDS(ON) and thermal design in SSOP package |
| Quiescent Current | 15µA in Burst Mode - extends battery runtime in standby or light-load states |
| Switching Frequency | 550kHz nominal, 350–750kHz externally synchronized - enables compact 2.2–6.2µH inductors |
| Output Accuracy | ±2% over –40°C to 85°C - ensures stable core voltage under thermal stress |
| Protection Features | Overcurrent, overtemperature, undervoltage/overvoltage on VFB, short-circuit foldback - prevents damage during fault conditions |
Pinout & Package
The LTC1879EGN#TRPBF is housed in a 16-lead plastic SSOP (GN) package with exposed pad for thermal enhancement (θJA = 140°C/W, θJC = 40°C/W). Pin 1 is SGND; pins are arranged in two rows (1–8 top, 9–16 bottom) with mirrored power and ground terminals for optimal PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SGND (1) | Signal Ground Reference | Low-noise return for feedback and control circuitry; must be isolated from PGND planes |
| RUN/SS (2) | Soft-Start & Shutdown Control | Pull >2.5V to enable; <0.7V to shut down (<1µA IQ); RC ramp enables controlled current rise |
| VFB (3) | Feedback Input | Monitors output via resistor divider; regulates to 0.8V reference with ±2% accuracy |
| ITH (4) | Error Amplifier Output | Current-mode control node; voltage sets peak inductor current (0.5–1.8V range) |
| SWP1/SWP2 (5,12) | Upper Switch Drain Nodes | Internally connected drains of P-channel MOSFETs; require low-inductance external tie |
| SWN1/SWN2 (6,11) | Lower Switch Drain Nodes | Internally connected drains of N-channel MOSFETs; require low-inductance external tie |
| PGND1/PGND2 (7,10) | Power Ground Returns | High-current return paths for switches/drivers; must be tied together near IC |
| PVIN1/PVIN2 (8,9) | Power Switch Supply | Bias supply for internal gate drivers; connect directly to input capacitor with low-ESR path |
| SVIN (13) | Signal Power Supply | Provides clean bias for error amplifier, comparators, and logic; decouple with 0.1µF |
| PGOOD (14) | Open-Drain Power Good | Pulled low when VFB deviates >±7.5% from target; requires external pull-up for system sequencing |
| SYNC/MODE (15) | Sync Input / Mode Select | Tie to SVIN for Burst Mode; ground for pulse skipping; apply 350–750kHz clock for sync |
| PLL_LPF (16) | Phase Detector Filter Output | Connect RC network (e.g., 10kΩ + 2200pF) to ground for stable PLL lock during sync |
Key Features
| Feature | Design Value |
|---|---|
| True PLL Frequency Locking | Enables jitter-free synchronization to external clocks (350–750kHz) with zero-degree phase shift |
| 100% Duty Cycle Low Dropout | Maintains regulation as VIN approaches VOUT - critical for end-of-battery-life operation |
| Integrated Dual MOSFETs | Eliminates need for external Schottky diode; reduces BOM count and board area |
| Burst Mode® Operation | Reduces IQ to 15µA at light loads while maintaining ±7.5% PGOOD window and fast wake-up |
| Power Good Monitoring | Active in all modes including shutdown - enables reliable system power sequencing |
Applications
| Cellular Telephones | Portable Computers |
|---|---|
Use Scenario: Powering RF transceivers and baseband processors in 3G/4G handsets with dual Li-ion batteries. IC Role / Device Role / Timing Role: Primary buck converter delivering 1.2V/1.8V core voltage with dynamic load response to burst transmission demands. Use Value: 95% peak efficiency and 15µA quiescent current extend talk time and standby duration without compromising transient performance. | Use Scenario: Regulating CPU I/O and memory rails in ultra-thin notebooks powered by 7.4V dual-cell Li-ion packs. IC Role / Device Role / Timing Role: High-density synchronous buck supplying 3.3V/2.5V at up to 1.2A with thermal foldback during sustained compute loads. Use Value: 100% duty cycle operation maintains regulation down to 2.65V input, preserving system uptime as battery discharges. |
| Wireless Modems | Industrial Handheld Terminals |
Use Scenario: Providing stable 3.1V supply to LTE/Wi-Fi modules in battery-powered IoT gateways. IC Role / Device Role / Timing Role: Main power stage with external clock sync to avoid interference with sensitive RF front-end circuits. Use Value: PLL-based synchronization (350–750kHz) eliminates beat frequencies and EMI peaks in narrowband bands. | Use Scenario: Powering ARM Cortex-M7 microcontrollers and display drivers in ruggedized field devices. IC Role / Device Role / Timing Role: Robust DC/DC with overtemperature/overcurrent protection and –40°C to 85°C guaranteed operation. Use Value: Integrated fault protection and ±2% output accuracy ensure reliable operation in uncontrolled thermal environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EDE#TRPBF | Higher 3A output, 3MHz switching, smaller 12-lead DFN package; no Burst Mode, higher 2.5mA IQ | Better suited for space-constrained, high-current apps; lacks ultra-low-IQ for long battery life | Select when >1.2A output or >1MHz frequency required; not drop-in due to different pinout and control scheme |
| TPS62130ARGTR | 1.5A output, 2.5MHz, 17µA IQ, 2.7–6V input; no external sync, no PGOOD, different compensation | Optimized for mid-range Li-ion (3.0–4.2V); lacks full 2.65V start-up and precision sync capability | Consider for cost-sensitive designs where 350–750kHz sync and ±7.5% PGOOD are non-critical |
Compared with LTC3605EDE#TRPBF and TPS62130ARGTR, the LTC1879EGN#TRPBF uniquely balances ultra-low quiescent current (15µA), wide 2.65–10V input, true PLL sync, and integrated PGOOD in a thermally robust SSOP package - making it optimal for battery longevity and noise-sensitive portable systems.
Availability
LTC1879EGN#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, portable computers, and wireless modems requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature grade performance.
Supply support for LTC1879EGN#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC1879EGN#TRPBF belongs to Linear's legacy high-efficiency DC/DC regulator product line, designed specifically for battery-powered portable electronics demanding ultra-low quiescent current, wide input range, and robust protection.
FAQ
What is the minimum input voltage required for LTC1879EGN#TRPBF to start switching?
The LTC1879EGN#TRPBF has a guaranteed minimum operating input voltage of 2.65V. Below this threshold, the device will not initiate switching or regulate output. At 2.65V input, maximum output current is reduced (e.g., ~1000mA at VOUT = 1.8V), and RDS(ON) increases - requiring careful thermal design. Startup behavior is verified across –40°C to 85°C ambient.
Does LTC1879EGN#TRPBF support remote voltage sensing?
Yes, the LTC1879EGN#TRPBF supports remote voltage sensing via its VFB pin. The external resistor divider should be connected directly across the load terminals (not at the IC output), allowing compensation for PCB trace IR drop. This configuration maintains ±2% output accuracy at the point of load, critical for low-voltage processor cores.
How does the SYNC/MODE pin affect Burst Mode operation in LTC1879EGN#TRPBF?
In the LTC1879EGN#TRPBF, Burst Mode is enabled only when the SYNC/MODE pin is tied to SVIN (or driven >1.5V). If the pin is grounded, pulse-skipping mode activates. During external synchronization (350–750kHz applied to SYNC/MODE), Burst Mode is automatically disabled - the device operates in forced continuous PWM regardless of load, ensuring deterministic timing.
What thermal considerations apply to LTC1879EGN#TRPBF in 100% duty cycle operation?
During 100% duty cycle (e.g., VIN ≈ VOUT), the LTC1879EGN#TRPBF's P-channel MOSFET conducts continuously, increasing conduction loss. At low VIN (e.g., 2.65V), RDS(ON) rises significantly - power dissipation must be calculated as IOUT² × RDS(ON). With θJA = 140°C/W, even 0.5W can raise junction temperature >70°C above ambient; proper copper pour and airflow are essential.
Can LTC1879EGN#TRPBF be used without external compensation components on the ITH pin?
No - the LTC1879EGN#TRPBF requires external compensation on the ITH pin for stable loop operation. A Type II or III network (e.g., series RC from ITH to SGND, plus optional capacitor to PVIN) is mandatory to set crossover frequency and phase margin. Omitting compensation causes instability, oscillation, or poor transient response - per Layout Guidelines in the datasheet.
LTC1879EGN#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
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.65V
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 10V
- Current - Output:
- 1.2A
- Frequency - Switching:
- 550kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC1879EGN#TRPBF FAQ
1.How can I place an order for LTC1879EGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1879EGN#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 LTC1879EGN#TRPBF reliable?
The price and inventory of LTC1879EGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1879EGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1879EGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1879EGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1879EGN#TRPBF?
LTC1879EGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1879EGN#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 LTC1879EGN#TRPBF?
For technical support, including LTC1879EGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1879EGN#TRPBF requirements.
6.How does Aetrix verify that LTC1879EGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1879EGN#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 LTC1879EGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1879EGN#TRPBF?
All LTC1879EGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1879EGN#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 LTC1879EGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC1879EGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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