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Analog Devices Inc. LTC1875EGN#TRPBF
- Part No.:
- LTC1875EGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1875EGN#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,393
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Product details
Overview
LTC1875EGN#TRPBF from Analog Devices (formerly Linear Technology) is a 1.5A monolithic synchronous step-down DC/DC regulator with constant-frequency current-mode control, 15µA quiescent current in Burst Mode, 550kHz nominal switching frequency, and 2.65V–6V input range-designed for Li-Ion-powered portable computers and wireless modems.
For engineers reviewing the LTC1875EGN#TRPBF datasheet, LTC1875EGN#TRPBF pinout, LTC1875EGN#TRPBF application, or LTC1875EGN#TRPBF equivalent, key selection criteria include its ±2% output voltage accuracy, true PLL-based external synchronization (350–750kHz), power good monitoring, low dropout operation (100% duty cycle), and integrated P/N-channel MOSFETs eliminating external diode requirements.
Technical Context
The LTC1875EGN#TRPBF implements a current-mode, constant-frequency buck architecture with internal synchronous rectification, enabling high efficiency up to 95% and fast transient response. Its dual-switch topology integrates a 0.35Ω P-channel high-side FET and 0.4Ω N-channel low-side FET, both rated for 2A DC current and 3A peak switching current.
It features true PLL-based frequency locking for jitter-free synchronization across 350–750kHz, independent of load or input conditions. The device supports three operating modes-Burst Mode (15µA IQ), pulse-skipping PWM (365µA IQ), and shutdown (<1µA)-with mode selection via the SYNC/MODE pin and soft-start control via RUN/SS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.65V to 6V - supports single-cell Li-Ion battery operation across full discharge curve. |
| Output Voltage Range | 0.8V to VIN - adjustable via external resistor divider; 0.8V reference enables low-voltage core rails. |
| Max Output Current | 1.5A continuous - limited by thermal design and RDS(ON) of internal FETs at ambient temperature. |
| Quiescent Current | 15µA in Burst Mode - extends battery runtime in standby or light-load portable applications. |
| Switching Frequency | 550kHz nominal, 350–750kHz externally synchronized - enables compact 2.2µH–6.8µH inductor selection. |
| Output Accuracy | ±2% over –40°C to 85°C - ensures stable regulation for precision analog or digital supply domains. |
| Power Good Threshold | ±7.5% window around VFB - provides reliable system-level power sequencing and fault detection. |
Pinout & Package
The LTC1875EGN#TRPBF is housed in a 16-lead plastic SSOP (GN) package with exposed pad for thermal enhancement. Pin assignments are validated per Linear Technology's official datasheet revision 1875f.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SGND (1) | Signal Ground Reference | Low-noise return path for feedback, error amplifier, and control logic; must be separated from PGND in layout. |
| RUN/SS (2) | Soft-Start & Enable Control | Pull >2.5V to enable; <0.7V to shut down (<1µA IQ); RC ramp enables controlled output voltage rise. |
| VFB (3) | Feedback Input | Monitors output via resistor divider; regulates to 0.8V reference; ±7.5% window triggers PGOOD. |
| ITH (4) | Error Amplifier Output | Current-source output controlling peak inductor current; 0.5–1.8V range sets load-current response. |
| SWP1/SWP2 (5,12) | High-Side Switch Drain Nodes | Internally connected drains of P-channel MOSFETs; require low-inductance tie-together and direct connection to inductor. |
| SWN1/SWN2 (6,11) | Low-Side Switch Drain Nodes | Internally connected drains of N-channel MOSFETs; must be tied together and routed to inductor node. |
| PGND1/PGND2 (7,10) | Power Ground Returns | High-current return paths for internal drivers and switches; must be joined with minimal trace inductance. |
| PVIN1/PVIN2 (8,9) | Power Supply Inputs | Supply pins for internal gate drivers; connect directly to input capacitor with low-ESR path. |
| PLL_LPF (16) | Phase Detector Filter Node | External RC filter sets PLL loop dynamics; open when unsynchronized; critical for stable frequency lock. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Rectification | Integrated 0.35Ω P-FET + 0.4Ω N-FET eliminates Schottky diode, increasing efficiency by 5–10% at medium loads. |
| Burst Mode Operation | Reduces IQ to 15µA at light loads while maintaining regulated output-ideal for battery-backed sleep states. |
| True PLL Synchronization | Locks switching edge to external clock (350–750kHz) with zero-phase offset, enabling noise-sensitive RF coexistence. |
| 100% Duty Cycle Low Dropout | Maintains regulation as VIN approaches VOUT-extends usable battery life down to 2.65V input. |
| Overvoltage/Undervoltage Protection | Detects VOUT excursion beyond ±7.5% of setpoint and asserts PGOOD low-supports fail-safe system monitoring. |
Applications
| Portable Computers | Wireless Modems |
|---|---|
Use Scenario: Powering CPU I/O, memory, and peripheral rails in ultra-thin notebooks with single-cell Li-Ion battery. IC Role / Device Role / Timing Role: Primary step-down regulator delivering 1.8V/2.5V/3.3V at up to 1.5A with tight load transient response. Use Value: 95% peak efficiency and 15µA Burst Mode IQ extend active runtime and reduce thermal load on compact PCBs. | Use Scenario: Supplying baseband processor, RF transceiver, and PMU in LTE/WiMAX CPE modems. IC Role / Device Role / Timing Role: Synchronized buck converter locked to system clock to avoid spectral interference in RF bands. Use Value: True PLL frequency locking (350–750kHz) suppresses switching noise near sensitive receive frequencies. |
| Portable Instruments | Industrial Handheld Terminals |
Use Scenario: Providing clean, regulated power to precision ADCs, DACs, and sensor interfaces in battery-operated test equipment. IC Role / Device Role / Timing Role: Low-noise, high-accuracy DC/DC source with ±2% output tolerance and low ripple in Burst Mode. Use Value: 0.8V reference and current-mode control ensure stable output under varying sensor load conditions. | Use Scenario: Powering ARM Cortex-A/M series SoCs and display drivers in ruggedized field terminals. IC Role / Device Role / Timing Role: Robust buck regulator with overtemperature and overcurrent protection for unattended operation. Use Value: Integrated thermal shutdown and 125°C TJMAX enable reliable performance in high-ambient industrial 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, but 50µA IQ in skip mode; requires external compensation. | Targets higher-power applications where size is constrained and efficiency at >500mA is critical. | Select when >1.5A output or >1MHz operation is required; not drop-in due to different pinout and compensation scheme. |
| TPS62130ARGTR | 1.5A, 3MHz, 17µA IQ, but no PLL sync; uses DCS-Control™ instead of current-mode architecture. | Preferred for space-constrained designs needing smaller inductors, but lacks precise frequency synchronization. | Choose for cost-sensitive, high-volume portable designs where external clock sync is unnecessary. |
Compared with LTC3605EDE#TRPBF and TPS62130ARGTR, the LTC1875EGN#TRPBF uniquely balances ultra-low quiescent current (15µA), true PLL synchronization, and integrated current-mode control-making it optimal for noise-sensitive, battery-critical applications where timing predictability and standby efficiency are jointly essential.
Availability
LTC1875EGN#TRPBF is available at Aetrix Electronics and suitable for portable computers, wireless modems, portable instruments, and industrial handheld terminals requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC1875EGN#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 all Linear-branded ICs.
The LTC1875EGN#TRPBF belongs to Linear's high-efficiency monolithic buck regulator family, engineered specifically for battery-powered portable systems demanding low IQ, precise regulation, and robust synchronization capability.
FAQ
What is the maximum output current capability of the LTC1875EGN#TRPBF under typical operating conditions?
The LTC1875EGN#TRPBF delivers up to 1.5A continuous output current when thermally managed within its 125°C junction limit. This rating assumes 2.65V–6V input, 3.3V output, 6.8µH inductor, and proper PCB copper area per the GN package θJA = 110°C/W specification. At lower input voltages (e.g., 2.65V), max output current reduces to ~1.2A due to increased RDS(ON) and conduction losses. Derating is required above 70°C ambient.
Does the LTC1875EGN#TRPBF support external frequency synchronization, and what is the valid range?
Yes, the LTC1875EGN#TRPBF supports true PLL-based external synchronization via the SYNC/MODE pin across 350kHz to 750kHz. Unlike simple clock injection, its digital phase/frequency detector achieves zero-degree phase offset and stable lock-even under load or input variation. Synchronization is disabled below 0.6V VFB (e.g., during short-circuit foldback) to preserve fault protection integrity.
How does Burst Mode operation affect output voltage ripple and efficiency in the LTC1875EGN#TRPBF?
In Burst Mode, the LTC1875EGN#TRPBF pulses the power stage intermittently to maintain regulation, reducing IQ to 15µA but increasing low-frequency output ripple (typically 10–30mVPP). Efficiency peaks at light loads (e.g., 85% at 1mA), outperforming PWM skip mode. Ripple can be minimized with larger output capacitance or by switching to pulse-skipping mode (via SYNC/MODE = GND) when tighter ripple specs apply.
What is the role of the PLL_LPF pin on the LTC1875EGN#TRPBF, and how should it be configured?
The PLL_LPF pin on the LTC1875EGN#TRPBF is the phase detector output node that drives the voltage-controlled oscillator (VCO). When synchronizing externally, a series RC network (e.g., 10kΩ + 2200pF) must be connected from PLL_LPF to SGND to filter phase error current and stabilize lock. If unused, PLL_LPF may be left floating-no pull-up/down required-as the internal VCO defaults to 550kHz operation.
Can the LTC1875EGN#TRPBF operate in 100% duty cycle, and what design considerations apply?
Yes, the LTC1875EGN#TRPBF supports 100% duty cycle for low-dropout operation when VIN approaches VOUT. In this mode, output voltage equals VIN minus IOUT × RDS(ON)(P-FET) and inductor DCR. Thermal design is critical: at 2.65V input and 1.5A load, power dissipation exceeds 500mW-requiring adequate copper area and airflow. Efficiency drops sharply below 3V input, so use only for brief dropout periods.
LTC1875EGN#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):
- 6V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 6V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 550kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC1875EGN#TRPBF FAQ
1.How can I place an order for LTC1875EGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1875EGN#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 LTC1875EGN#TRPBF reliable?
The price and inventory of LTC1875EGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1875EGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1875EGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1875EGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1875EGN#TRPBF?
LTC1875EGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1875EGN#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 LTC1875EGN#TRPBF?
For technical support, including LTC1875EGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1875EGN#TRPBF requirements.
6.How does Aetrix verify that LTC1875EGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1875EGN#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 LTC1875EGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1875EGN#TRPBF?
All LTC1875EGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1875EGN#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 LTC1875EGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC1875EGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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