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Analog Devices Inc. LTC1879EGN#PBF
- Part No.:
- LTC1879EGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1879EGN#PBF.pdf
- Description:
- IC REG BUCK ADJ 1.2A 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:754
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Product details
Overview
LTC1879EGN#PBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC regulator with constant-frequency current-mode control, delivering up to 1.2A output current. It operates from 2.65V to 10V input, regulates output from 0.8V to VIN, features 15µA quiescent current in Burst Mode, and integrates dual P/N-channel MOSFETs in a 16-lead SSOP package for portable Li-ion battery-powered systems.
For engineers reviewing the LTC1879EGN#PBF datasheet, LTC1879EGN#PBF pinout, LTC1879EGN#PBF application, or LTC1879EGN#PBF equivalent, key selection criteria include its 550kHz nominal switching frequency, ±2% output voltage accuracy over –40°C to 85°C, true PLL-based external synchronization (350–750kHz), power good monitoring, and low-dropout 100% duty cycle operation - all critical for battery life extension and noise-sensitive power rail design.
Technical Context
The LTC1879EGN#PBF implements a current-mode, constant-frequency buck architecture with internal synchronous rectification, eliminating external Schottky diodes. Its dual-switch topology uses integrated P-channel (RDS(ON) = 0.45Ω typ at 5V) and N-channel (RDS(ON) = 0.5Ω typ at 5V) MOSFETs, enabling high efficiency up to 95% and supporting continuous conduction mode down to light loads.
It incorporates a phase-locked loop (PLL) for precise external clock synchronization, a dedicated RUN/SS pin for controlled soft-start and shutdown (<1µA), and a PGOOD open-drain output with ±7.5% window detection. Burst Mode operation reduces quiescent current to 15µA while maintaining regulation, and slope compensation prevents subharmonic oscillation above 40% duty cycle.
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 - enables low-voltage core rails (e.g., 1.2V, 1.8V, 2.5V, 3.1V) via resistor divider. |
| Max Output Current | 1.2A continuous - sufficient for baseband processors, RF transceivers, and display drivers. |
| Quiescent Current | 15µA in Burst Mode - extends battery runtime in standby/sleep states of portable devices. |
| Switching Frequency | 550kHz nominal, 350–750kHz externally synchronized - balances efficiency, EMI, and component size. |
| Output Accuracy | ±2% over –40°C to 85°C - ensures stable voltage margins for sensitive analog and digital circuitry. |
| Protection Features | Overcurrent, overtemperature, undervoltage/overvoltage on VFB, short-circuit foldback - enables robust field operation. |
Pinout & Package
Package: 16-lead plastic SSOP (GN), 0.150" wide, JEDEC MO-153 compliant, θJA = 140°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SGND (1) | Signal Ground Reference | Low-noise reference for feedback and control circuitry; must be separated from PGND in layout. |
| RUN/SS (2) | Soft-Start & Enable Input | Pull >2.5V to enable; ramp voltage for controlled startup; <0.7V forces shutdown (<1µA IQ). |
| VFB (3) | Feedback Input | Monitors output via resistor divider; 0.8V internal reference sets VOUT = 0.8V × (1 + R1/R2). |
| ITH (4) | Error Amplifier Output | Current-source compensation node; voltage controls peak inductor current (0.5–1.8V range). |
| SWP1/SWP2 (5,12) | Upper Switch Drain Nodes | Internally connected drains of P-channel MOSFETs; must be tied together externally. |
| SWN1/SWN2 (6,11) | Lower Switch Drain Nodes | Internally connected drains of N-channel MOSFETs; must be tied together externally. |
| PGND1/PGND2 (7,10) | Power Ground Returns | High-current return paths for switches/drivers; tie directly to thermal pad and input/output caps. |
| PVIN1/PVIN2 (8,9) | Power Switch Supply | Provides gate drive voltage for internal MOSFETs; connect to input capacitor with low-inductance path. |
| SVIN (13) | Signal Power Supply | Bias supply for control logic and error amplifier; decouple with 0.1µF ceramic cap. |
| PGOOD (14) | Open-Drain Power Good | Pulled low when VFB deviates >±7.5% from 0.8V; requires external pull-up for system sequencing. |
| SYNC/MODE (15) | Sync Clock Input / Mode Select | Tie to SVIN for Burst Mode; ground for pulse-skipping; apply 350–750kHz clock for synchronization. |
| PLL_LPF (16) | Phase Detector Filter Output | Connect RC network to ground for external sync; open if unused; controls VCO frequency via PLL loop. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Rectification | Integrated P/N-channel MOSFETs eliminate external Schottky diode, increasing efficiency by ~5–10% at medium loads. |
| Burst Mode Operation | Reduces IQ to 15µA at light loads while maintaining regulation - critical for cellular phone standby time. |
| True PLL Synchronization | Locks switching edge to external clock (350–750kHz) with zero-phase offset, enabling deterministic EMI reduction. |
| 100% Duty Cycle Low Dropout | Maintains regulation as VIN approaches VOUT, extending usable battery voltage range in portable systems. |
| Power Good Monitoring | Active in all operating modes including Burst Mode and shutdown - enables reliable system power sequencing. |
| Thermal & Overcurrent Protection | Auto-recovering shutdown at TJ > 125°C and cycle-by-cycle current limiting prevent damage during fault conditions. |
Applications
| Cellular Baseband Power | Portable Computer Core Rail |
|---|---|
Use Scenario: Supplies 1.2V/1.8V core voltage to ARM-based baseband processors in 3G/4G handsets during active and sleep modes. IC Role / Device Role / Timing Role: Primary synchronous buck regulator managing dynamic load steps (0–1A) with fast transient response and ultra-low quiescent current. Use Value: Burst Mode extends talk time by minimizing no-load losses; PGOOD enables clean processor reset sequencing. |
Use Scenario: Powers CPU I/O or GPU core in ultraportable laptops using dual-cell Li-ion (7.2–8.4V) input. IC Role / Device Role / Timing Role: High-efficiency step-down converter with 550kHz fixed frequency, enabling compact 2.2µH inductor and low-ESR ceramic output caps. Use Value: 95% peak efficiency reduces thermal load on PCB; 100% duty cycle sustains operation down to 2.8V battery voltage. |
| Wireless Modem RF Bias | Industrial Handheld Terminal |
Use Scenario: Generates stable 3.1V bias for LTE/Wi-Fi RF front-end modules requiring low noise and fast load transient recovery. IC Role / Device Role / Timing Role: Regulator with current-mode control and slope compensation, suppressing subharmonics at high duty cycles near VIN/VOUT = 2.5. Use Value: SYNC/MODE pin allows EMI spread-spectrum alignment with host SoC clock; PGOOD confirms RF supply readiness before transmission. |
Use Scenario: Powers microcontroller, display, and barcode scanner in ruggedized handheld terminals operating from 3.6V–10V industrial batteries. IC Role / Device Role / Timing Role: Robust DC/DC with overtemperature protection, ±2% output accuracy, and wide input range for variable battery chemistries. Use Value: Shutdown current <1µA preserves battery during multi-week storage; SS pin enables controlled power-up of peripherals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8610EMSE#PBF | Higher 3.4A output, 2MHz switching, 2.5µA quiescent current; requires external compensation. | Better suited for higher-current, space-constrained designs needing faster transient response. | Select LT8610EMSE#PBF when >1.2A output or >1MHz frequency is required; LTC1879EGN#PBF remains optimal for cost-sensitive, 550kHz-optimized portable designs. |
| TPS54202DDCR | 2A output, 4.5–17V input, 25µA quiescent current; no PLL sync, only basic frequency foldback. | Lacks true PLL synchronization and Burst Mode - less effective for ultra-low-power battery standby. | Choose TPS54202DDCR for wider input range and higher current where EMI synchronization is not required; LTC1879EGN#PBF preferred when 350–750kHz sync and 15µA IQ are mandatory. |
Compared with LT8610EMSE#PBF and TPS54202DDCR, the LTC1879EGN#PBF delivers superior light-load efficiency via Burst Mode and deterministic EMI control via true PLL lock - making it uniquely suitable for battery-powered communication devices where standby time and spectral compliance are primary constraints.
Availability
LTC1879EGN#PBF 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 performance across –40°C to 85°C ambient conditions.
Supply support for LTC1879EGN#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 product continuity, technical documentation, and manufacturing for legacy Linear regulators like the LTC1879 series.
The LTC1879EGN#PBF belongs to Linear's high-efficiency monolithic synchronous buck regulator family, designed specifically for portable Li-ion battery-powered applications demanding ultra-low quiescent current, precise voltage regulation, and robust thermal performance.
FAQ
What is the maximum output current capability of the LTC1879EGN#PBF?
The LTC1879EGN#PBF delivers up to 1.2A continuous output current under typical thermal conditions (θJA = 140°C/W, TA ≤ 85°C). Peak inductor current capability reaches 2.2A (typ), but sustained 1.2A operation requires proper PCB copper area, input/output capacitance, and inductor saturation rating per the datasheet thermal guidelines. Derating applies below 2.65V input or above 85°C ambient.
Does the LTC1879EGN#PBF support external frequency synchronization, and what is the valid range?
Yes, the LTC1879EGN#PBF supports true PLL-based external synchronization via the SYNC/MODE pin across 350kHz to 750kHz. The internal oscillator locks to the rising edge of the external clock with zero phase offset. Synchronization is disabled when VFB < 0.6V (e.g., during short-circuit foldback), ensuring robust fault handling without interference.
How does Burst Mode operation affect output voltage ripple and efficiency in the LTC1879EGN#PBF?
In Burst Mode, the LTC1879EGN#PBF reduces switching activity at light loads, lowering quiescent current to 15µA and maximizing battery life - but causes higher low-frequency output ripple due to intermittent energy delivery. Pulse skipping mode (SYNC/MODE grounded) provides lower ripple at the cost of higher light-load IQ (~270µA). Designers select based on priority: runtime (Burst) vs. noise (pulse skip).
What is the function of the PLL_LPF pin on the LTC1879EGN#PBF, and how should it be configured?
The PLL_LPF pin on the LTC1879EGN#PBF is the phase detector output that drives the voltage-controlled oscillator (VCO) during external synchronization. When syncing, connect a series RC network (e.g., 10kΩ + 2200pF) from PLL_LPF to ground to filter phase error current and stabilize lock. If unused, leave PLL_LPF open - the internal VCO defaults to 550kHz operation.
Can the LTC1879EGN#PBF operate with 100% duty cycle, and what design considerations apply?
Yes, the LTC1879EGN#PBF supports 100% duty cycle for low-dropout operation when VIN approaches VOUT. In this mode, output voltage equals VIN minus voltage drops across the P-channel MOSFET (RDS(ON) ≈ 0.45Ω) and inductor DCR. Thermal design must account for increased conduction loss - especially at low VIN (e.g., 2.65V), where RDS(ON) rises and power dissipation peaks.
LTC1879EGN#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
- 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#PBF FAQ
1.How can I place an order for LTC1879EGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1879EGN#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 LTC1879EGN#PBF reliable?
The price and inventory of LTC1879EGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1879EGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC1879EGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1879EGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1879EGN#PBF?
LTC1879EGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1879EGN#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 LTC1879EGN#PBF?
For technical support, including LTC1879EGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1879EGN#PBF requirements.
6.How does Aetrix verify that LTC1879EGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1879EGN#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 LTC1879EGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC1879EGN#PBF?
All LTC1879EGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1879EGN#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 LTC1879EGN#PBF part is unused and in its original packaging.
Return procedure for LTC1879EGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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