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Analog Devices Inc. LTC1707CS8#TRPBF
- Part No.:
- LTC1707CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1707CS8#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 600MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,975
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Product details
Overview
LTC1707CS8#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC converter IC designed for battery-powered systems. It delivers up to 600mA output current with up to 96% efficiency, operates from 2.85V to 8.5V input, features 350kHz fixed-frequency PWM with external synchronization up to 550kHz, and supports low-dropout operation via 100% duty cycle - ideal for single/dual Li-ion portable power rails.
For engineers reviewing the LTC1707CS8#TRPBF datasheet, LTC1707CS8#TRPBF pinout, LTC1707CS8#TRPBF application, or LTC1707CS8#TRPBF equivalent, key selection criteria include its internal P/N-channel MOSFETs, 0.8V feedback reference enabling outputs down to 0.8V, Burst Mode™ operation for <200µA quiescent current at light load, precision 2.7V undervoltage lockout, and SO-8 package compatibility with standard PCB layout practices.
Technical Context
The LTC1707CS8#TRPBF implements a constant-frequency current-mode control architecture with integrated high-side P-channel and low-side N-channel MOSFETs. Its error amplifier output (ITH pin) directly controls peak inductor current, while slope compensation prevents subharmonic oscillation above 40% duty cycle.
It supports three operational modes: Burst Mode™ (enabled by floating or pulling SYNC/MODE high), pulse-skipping mode (SYNC/MODE grounded), and externally synchronized PWM (385–550kHz TTL/CMOS clock). Undervoltage lockout (2.7V ±0.15V) and short-circuit frequency foldback (to ~35kHz) are hardware-enforced protections.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.85V to 8.5V - supports single Li-ion (2.85–4.2V) and dual Li-ion (5.7–8.4V) battery inputs without external regulators. |
| Output Current | 600mA (VIN ≥ 4V) - derated below 4V per Figure 2a; sufficient for baseband processors, RF transceivers, and sensor subsystems. |
| Switching Frequency | 350kHz (internal), synchronizable to 385–550kHz - enables compact 15µH inductors and reduces EMI in noise-sensitive audio/RF sections. |
| Feedback Reference | 0.80V ±2.5% - sets minimum VOUT = 0.8V; allows precise resistor-divider programming of 0.8V–VIN outputs (e.g., 1.2V, 1.8V, 2.5V, 3.3V). |
| Quiescent Current | 200µA (Burst Mode), 11µA (shutdown) - extends battery runtime in standby/sleep states of portable instruments and modems. |
| Efficiency Peak | 96% at VOUT = 3.3V, VIN = 6V, IOUT = 300mA - achieved via synchronous rectification eliminating Schottky loss and low RDS(ON) FETs (0.5Ω/0.6Ω typ). |
| UVLO Threshold | 2.70V ±0.15V with 100mV hysteresis - prevents deep discharge of Li-ion cells and ensures clean startup/shutdown sequencing. |
Pinout & Package
Package: 8-lead plastic SO (SO-8), 150 mil width, JEDEC MS-012AC, θJA = 120°C/W, TJMAX = 125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH (1) | Error amplifier output / current limit control | Voltage (0–1.2V) sets peak inductor current; used for external compensation and soft-start ramp control. |
| RUN/SS (2) | Enable + soft-start timing input | Pull <0.4V for shutdown; capacitor to GND sets soft-start time (~0.5s/µF); internal 2.25µA current source ramps voltage. |
| VFB (3) | Feedback node input | Compares resistive divider output against 0.8V reference; determines regulated output voltage accuracy and loop stability. |
| GND (4) | Power and signal ground reference | Common return for all internal circuits; must be low-impedance connection to minimize noise coupling into control loop. |
| SW (5) | Switch node | Connects to inductor; carries high di/dt square-wave current from internal P/N-FETs; requires tight layout with minimal trace inductance. |
| VIN (6) | Main input supply | Accepts 2.85–8.5V; requires local 22µF ceramic decoupling close to pin to suppress switching transients. |
| SYNC/MODE (7) | External sync clock input / mode select | Float or tie to VIN for Burst Mode™; ground for pulse-skipping; apply 385–550kHz TTL/CMOS clock for synchronization. |
| VREF (8) | Precision 1.19V reference output | ±1% accuracy, stable to 100µA load and 2000pF capacitance; usable as auxiliary reference for ADCs or comparators. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode - reduces BOM count, board area, and conduction losses by replacing diode drop with low RDS(ON) N-FET. |
| Burst Mode™ operation | Reduces quiescent current to 200µA at light loads while maintaining regulation - critical for battery life in cellular standby and wireless sensor sleep cycles. |
| 100% duty cycle dropout | Enables VOUT ≈ VIN − IOUT × RDS(ON)_P - extends usable battery range down to 2.85V input without output collapse. |
| Internal current-mode control | Provides inherent line/load transient immunity and simplifies loop compensation - no external type-II/III network required for most applications. |
| Programmable soft-start | Capacitor on RUN/SS pin controls output ramp rate and inrush current - prevents input rail sag and enables controlled power sequencing with other ICs. |
Applications
| Cellular Telephones | Portable Instruments |
|---|---|
Use Scenario: Powering baseband processor core and I/O rails from single Li-ion cell (3.0–4.2V). IC Role / Device Role / Timing Role: Primary buck regulator delivering 1.2V/1.8V/2.8V at up to 600mA with fast load transient response. Use Value: Burst Mode™ maintains >85% efficiency at 10mA sleep current; 2.7V UVLO prevents cell over-discharge; SO-8 footprint fits compact handset layouts. | Use Scenario: Supplying analog front-end, microcontroller, and display driver in handheld multimeters or data loggers. IC Role / Device Role / Timing Role: Main system regulator converting dual AA/AAA or Li-ion input to stable 3.3V logic rail. Use Value: 96% peak efficiency minimizes thermal rise in sealed enclosures; 0.8V reference enables accurate 2.5V sensor bias; VREF pin provides calibrated 1.19V for ADC reference. |
| Wireless Modems | RF Communications |
Use Scenario: Generating clean 3.3V supply for LTE/Wi-Fi modem ICs with bursty transmit/receive current profiles. IC Role / Device Role / Timing Role: High-efficiency power stage with low-noise Burst Mode™ and external sync capability to avoid interference with RF bands. Use Value: SYNC/MODE pin allows locking switching frequency to non-harmonic values; 350kHz base frequency avoids GSM 900MHz harmonics; low EMI due to synchronous design. | Use Scenario: Providing low-noise 2.5V/3.3V bias to RF power amplifiers, LNAs, and synthesizers in point-to-point radios. IC Role / Device Role / Timing Role: Low-ripple, low-PSRR post-regulator following a higher-voltage primary supply. Use Value: 100% duty cycle supports brownout operation during battery sag; 0.8V feedback reference enables tight tolerance on sensitive RF supply rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3502AEDD#TRPBF | Higher 3MHz switching frequency; 400mA output; requires external compensation; no Burst Mode™ | Better suited for ultra-compact designs needing smaller inductors; less efficient at light loads due to fixed-frequency operation | Select when board space is constrained and light-load efficiency is secondary to size |
| TPS62231DRVR | 3MHz sync-capable; 600mA; integrated compensation; DCS-Control™ topology; 17µA IQ in eco-mode | Superior light-load efficiency and faster transient response; different control scheme requires revalidation of loop stability | Select for new designs prioritizing lowest possible quiescent current and fastest load step recovery |
Compared with LT3502AEDD#TRPBF and TPS62231DRVR, the LTC1707CS8#TRPBF offers proven Burst Mode™ efficiency at medium loads (10–300mA), robust 2.85V start-up, and SO-8 compatibility with legacy Linear designs - making it optimal for cost-sensitive, battery-life-critical industrial and telecom modules where layout reuse matters.
Availability
LTC1707CS8#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, portable instruments, wireless modems, and RF communications systems requiring stable component supply across extended production lifecycles.
Supply support for LTC1707CS8#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 support for its high-performance power management portfolio.
The LTC1707CS8#TRPBF belongs to Linear's legacy monolithic synchronous buck regulator family, engineered specifically for high-efficiency, low-voltage battery-powered applications where small size, long runtime, and reliable dropout behavior are essential.
FAQ
What is the minimum input voltage required for the LTC1707CS8#TRPBF to start switching?
The LTC1707CS8#TRPBF has a precision undervoltage lockout (UVLO) that activates at 2.70V ±0.15V. It begins switching only when VIN rises above this threshold - typically 2.80V during ramp-up at 25°C. Below 2.85V, maximum output current is derated, and full 600mA is guaranteed only for VIN ≥ 4V. The LTC1707CS8#TRPBF remains latched off until VIN exceeds the UVLO release point, ensuring safe Li-ion cell operation.
Can the LTC1707CS8#TRPBF regulate output voltages lower than 0.8V?
No, the LTC1707CS8#TRPBF cannot regulate below 0.8V because its internal feedback reference is fixed at 0.80V ±2.5%. The output voltage is set by VOUT = 0.8V × (1 + R1/R2), so the lowest achievable regulated output is exactly 0.8V (when R1 = 0Ω and R2 is omitted or shorted). Attempting sub-0.8V operation results in loss of regulation and uncontrolled VOUT collapse. For lower outputs, consider the LTC3630 or LTC3631 families.
How does the SYNC/MODE pin affect efficiency at light loads?
When the SYNC/MODE pin is floating or tied to VIN, the LTC1707CS8#TRPBF enters Burst Mode™, reducing quiescent current to 200µA and maintaining >85% efficiency down to ~1mA load. Grounding SYNC/MODE forces pulse-skipping mode, which increases light-load ripple and lowers efficiency to ~70% at 10mA but eliminates low-frequency audio noise. The LTC1707CS8#TRPBF's Burst Mode™ is disabled during external synchronization to prevent beat frequencies.
What is the purpose of the ITH pin on the LTC1707CS8#TRPBF, and can it be left unconnected?
The ITH pin on the LTC1707CS8#TRPBF is the error amplifier output and serves as the current limit control node. It must not be left unconnected: an open ITH causes unstable operation or complete failure to regulate. Standard use connects a series RC network (e.g., 47pF + 100kΩ) from ITH to GND for noise filtering and loop compensation. The LTC1707CS8#TRPBF relies on ITH voltage (0–1.2V) to set peak inductor current - disconnecting it breaks the control loop.
Does the LTC1707CS8#TRPBF require an external Schottky diode?
No, the LTC1707CS8#TRPBF does not require an external Schottky diode because it integrates both high-side P-channel and low-side N-channel synchronous MOSFETs. This eliminates reverse-conduction losses and thermal stress associated with discrete diodes, reduces component count, saves PCB area, and improves full-load efficiency by up to 8% compared to asynchronous buck converters. The LTC1707CS8#TRPBF's synchronous design is intrinsic to its architecture and requires no external rectifier.
LTC1707CS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (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):
- 2.85V
- Voltage - Input (Max):
- 8.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 8.5V
- Current - Output:
- 600mA
- Frequency - Switching:
- 35kHz ~ 350kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1707CS8#TRPBF FAQ
1.How can I place an order for LTC1707CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1707CS8#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 LTC1707CS8#TRPBF reliable?
The price and inventory of LTC1707CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1707CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1707CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1707CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1707CS8#TRPBF?
LTC1707CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1707CS8#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 LTC1707CS8#TRPBF?
For technical support, including LTC1707CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1707CS8#TRPBF requirements.
6.How does Aetrix verify that LTC1707CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1707CS8#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 LTC1707CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1707CS8#TRPBF?
All LTC1707CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1707CS8#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 LTC1707CS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1707CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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