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Analog Devices Inc. LTC1875EGN#PBF
- Part No.:
- LTC1875EGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1875EGN#PBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:211
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Product details
Overview
LTC1875EGN#PBF 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 battery-powered portable computers and wireless modems.
For engineers reviewing the LTC1875EGN#PBF datasheet, LTC1875EGN#PBF pinout, LTC1875EGN#PBF application, or LTC1875EGN#PBF equivalent, key selection considerations include its true PLL-based external synchronization (350–750kHz), ±2% output voltage accuracy over –40°C to 85°C, 100% duty-cycle low-dropout operation, integrated P/N-channel MOSFETs, and power-good monitoring with open-drain PGOOD output.
Technical Context
The LTC1875EGN#PBF implements a current-mode, constant-frequency buck architecture with internal synchronous rectification, eliminating external Schottky diodes. Its phase-locked loop enables precise external clock synchronization across 350–750kHz while maintaining zero-degree phase alignment between internal and external oscillators.
It supports three operating modes: Burst Mode (15µA IQ, intermittent switching), pulse-skipping PWM (lower ripple, <365µA IQ), and shutdown (<1µA IQ). The device integrates overcurrent and overtemperature protection, 0.8V reference, and a dedicated soft-start/run control pin (RUN/SS) with active pull-down during undervoltage lockout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.65V to 6V - supports single-cell Li-ion (2.7–4.2V) with headroom for charging and transient spikes. |
| Output Current | Up to 1.5A continuous - sufficient for core logic rails in portable instruments and modem basebands. |
| Quiescent Current | 15µA in Burst Mode - extends battery runtime in standby or low-power sleep states. |
| Switching Frequency | 550kHz nominal, synchronizable 350–750kHz - enables compact 2.2µH–6.8µH inductors and ceramic input/output capacitors. |
| Feedback Reference | 0.80V ±2% - allows precise output programming from 0.8V to VIN using standard resistor dividers. |
| Efficiency | Up to 95% at 1.5A - achieved via integrated low-RDS(ON) P/N-FETs (0.35Ω/0.40Ω typ at 5V) and synchronous rectification. |
| Protection Features | Overcurrent, overtemperature, undervoltage/overvoltage detection on VFB, and short-circuit foldback - ensures robust operation under fault conditions. |
Pinout & Package
Package: 16-lead plastic SSOP (GN), 0.150" wide, JEDEC MO-153 compliant, θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SGND (1) | Signal Ground Reference | Low-noise analog ground for feedback, error amplifier, and control circuitry; must be isolated from PGND planes. |
| RUN/SS (2) | Soft-Start & Enable Input | Pull >2.5V to enable; <0.7V to shut down (<1µA IQ); RC ramp enables controlled output voltage rise and sequencing. |
| VFB (3) | Feedback Input | Monitors output via resistor divider; regulates to 0.8V reference; ±7.5% window triggers PGOOD assertion. |
| ITH (4) | Error Amplifier Output | Current-mode control node; voltage sets peak inductor current; compensation network connects here. |
| SWP1/SWP2 (5,12) | Upper Switch Drain Nodes | Internally connected drains of P-channel MOSFETs; require low-inductance routing to inductor and PVIN. |
| SWN1/SWN2 (6,11) | Lower Switch Drain Nodes | Internally connected drains of N-channel MOSFETs; connect directly to inductor and PGND. |
| PGND1/PGND2 (7,10) | Power Ground Returns | High-current return paths for switches and drivers; must be tied together and connected to thermal pad if present. |
| PVIN1/PVIN2 (8,9) | Power Switch Supply | Provides gate drive voltage for internal FETs; bypass with 22µF ceramic capacitor near pins. |
| PLL_LPF (16) | Phase Detector Filter Output | Connects to external RC filter for PLL lock; open when unsynchronized; determines VCO frequency during sync. |
| SYNC/MODE (15) | Sync Clock Input / Mode Select | Tie to SVIN for Burst Mode; ground for pulse-skipping; apply 350–750kHz clock for synchronization. |
| PGOOD (14) | Open-Drain Power-Good Flag | Pulled low when VFB deviates >±7.5% from 0.8V; requires external pull-up for system monitoring. |
| SVIN (13) | Signal Supply Voltage | Bias supply for analog control circuitry; decouple with 0.1µF ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| True PLL Synchronization | Locks internal oscillator to external 350–750kHz clock with zero-phase offset-critical for noise-sensitive RF sections. |
| 100% Duty-Cycle Operation | Enables dropout-free regulation down to VIN ≈ VOUT + IOUT×RDS(ON)-extends usable battery life in deep discharge. |
| Integrated Synchronous FETs | Eliminates external Schottky diode and associated losses; reduces BOM count and layout area in space-constrained designs. |
| Burst Mode Efficiency | Maintains >80% efficiency at 1mA load via intermittent switching-optimized for always-on subsystems in portable devices. |
| Power-Good Monitoring | Active in all modes (Burst, PWM, shutdown); provides reliable system reset or sequencing signal without external comparators. |
Applications
| Portable Computers | Wireless Modems |
|---|---|
Use Scenario: Core voltage rail (1.2V–1.8V) for Intel Atom or ARM Cortex-A series SoCs in ultra-thin notebooks and 2-in-1 tablets. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering stable, low-noise power with fast transient response to CPU DVFS events. Use Value: 15µA quiescent current extends battery life in suspend-to-RAM mode; 550kHz switching enables compact 4.7µH inductors and avoids AM radio band interference. | Use Scenario: 3.3V supply for LTE/5G baseband processors and RF transceivers in cellular IoT modules and mobile hotspots. IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter feeding LDOs and PMICs; synchronized to system clock to suppress switching noise in sensitive RX paths. Use Value: PLL-based sync eliminates beat frequencies with RF LOs; ±2% output accuracy ensures reliable digital logic operation across temperature. |
| Portable Instruments | Medical Handheld Devices |
Use Scenario: 2.5V analog front-end supply for precision ADCs and op-amps in handheld multimeters and oscilloscopes. IC Role / Device Role / Timing Role: Low-noise, low-ripple power source with tight load regulation (±0.6%) and minimal conducted EMI. Use Value: Burst Mode minimizes standby power draw; 0.8V reference enables accurate output setting with 1% resistors; PGOOD confirms rail stability before measurement acquisition. | Use Scenario: 1.5V core supply for ARM-based patient monitors and portable ultrasound controllers requiring FDA-compliant reliability. IC Role / Device Role / Timing Role: Safety-critical power regulator with overtemperature and overcurrent protection, monitored via PGOOD and RUN/SS sequencing. Use Value: Shutdown current <1µA meets IEC 62304 low-power requirements; 125°C junction limit and thermal shutdown prevent field failures in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54202DRTT | 4.5–17V input, 2A output, 500kHz fixed freq, no PLL sync, 22µA IQ in Eco-mode | Higher VIN range suits 12V industrial inputs; lacks true PLL sync and 100% duty cycle | Select when input exceeds 6V or when external sync is unnecessary; verify thermal performance at 1.5A in SSOP. |
| MP2315DJ-LF-Z | 4.5–28V input, 1.5A, 500kHz, no sync, 25µA IQ, integrated compensation | Wider VIN supports 5V/12V systems; simpler design but no Burst Mode or PGOOD | Choose for cost-sensitive, non-battery applications where PGOOD and ultra-low IQ are not required. |
Compared with TPS54202DRTT and MP2315DJ-LF-Z, the LTC1875EGN#PBF uniquely delivers 2.65V minimum input, true PLL synchronization, and 100% duty-cycle operation-making it irreplaceable in single-cell Li-ion portable systems demanding maximum runtime and noise immunity.
Availability
LTC1875EGN#PBF is available at Aetrix Electronics and suitable for portable computers, wireless modems, and portable instruments requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC1875EGN#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 support, documentation, and manufacturing continuity for legacy Linear parts including the LTC1875 series.
The LTC1875 belongs to Linear's high-efficiency monolithic buck regulator family, engineered specifically for battery-powered portable electronics where ultra-low quiescent current, small solution size, and robust protection are mandatory.
FAQ
What is the minimum input voltage supported by the LTC1875EGN#PBF?
The LTC1875EGN#PBF supports a minimum input voltage of 2.65V, enabling direct operation from partially discharged single-cell Li-ion batteries down to ~2.7V. Below this threshold, the device enters undervoltage lockout and pulls RUN/SS low to prevent erratic behavior. This 2.65V rating is verified across –40°C to 85°C and is critical for maximizing usable battery capacity in portable computers and modems.
Does the LTC1875EGN#PBF require an external Schottky diode?
No, the LTC1875EGN#PBF does not require an external Schottky diode because it integrates both a P-channel high-side and N-channel low-side MOSFET in a synchronous buck topology. This integration eliminates reverse recovery losses and conduction losses associated with discrete diodes, improving efficiency by up to 5% at medium loads and reducing solution footprint-confirmed in the LTC1875EGN#PBF datasheet Figure 1 and Applications Information section.
How does the SYNC/MODE pin configure Burst Mode versus pulse-skipping operation on the LTC1875EGN#PBF?
On the LTC1875EGN#PBF, tying the SYNC/MODE pin to SVIN (logic high >1.5V) enables Burst Mode operation (15µA IQ), while grounding it selects pulse-skipping PWM mode (<365µA IQ). During external synchronization (350–750kHz applied), Burst Mode is automatically disabled. These configurations are explicitly defined in the Electrical Characteristics table and Functional Description section of the LTC1875EGN#PBF datasheet.
What is the purpose of the PLL_LPF pin on the LTC1875EGN#PBF?
On the LTC1875EGN#PBF, the PLL_LPF pin serves as the phase detector output and voltage-controlled oscillator (VCO) control node. When externally synchronized, it connects to an RC low-pass filter (e.g., 10kΩ + 2200pF) that smooths phase-error current pulses to generate a stable DC voltage that locks the internal oscillator frequency and phase to the external clock-ensuring jitter-free, zero-phase-offset synchronization as detailed in Figures 5 and 6 of the LTC1875EGN#PBF datasheet.
Can the LTC1875EGN#PBF operate with 100% duty cycle, and what design implications does that have?
Yes, the LTC1875EGN#PBF supports true 100% duty-cycle operation, allowing VOUT to track VIN minus only the RDS(ON) drop of the P-channel switch and inductor DCR. This is essential for maintaining regulation as Li-ion voltage declines below 3.3V. However, at low VIN (e.g., 2.65V), RDS(ON) rises significantly-requiring careful thermal design per Figure G01 and derating calculations in the Applications Information section of the LTC1875EGN#PBF datasheet.
LTC1875EGN#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):
- 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#PBF FAQ
1.How can I place an order for LTC1875EGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1875EGN#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 LTC1875EGN#PBF reliable?
The price and inventory of LTC1875EGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1875EGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC1875EGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1875EGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1875EGN#PBF?
LTC1875EGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1875EGN#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 LTC1875EGN#PBF?
For technical support, including LTC1875EGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1875EGN#PBF requirements.
6.How does Aetrix verify that LTC1875EGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1875EGN#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 LTC1875EGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC1875EGN#PBF?
All LTC1875EGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1875EGN#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 LTC1875EGN#PBF part is unused and in its original packaging.
Return procedure for LTC1875EGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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