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Analog Devices Inc. LTC1707CS8#PBF
- Part No.:
- LTC1707CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1707CS8#PBF.pdf
- Description:
- IC REG BUCK ADJ 600MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:346
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Product details
Overview
LTC1707CS8#PBF 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#PBF datasheet, LTC1707CS8#PBF pinout, LTC1707CS8#PBF application, or LTC1707CS8#PBF 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, and SO-8 package compatibility with space-constrained handheld designs.
Technical Context
The LTC1707CS8#PBF 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 VFB compares against a precision 0.80V ±1% reference to regulate output voltage.
Burst Mode™ operation is enabled by floating or pulling SYNC/MODE high, reducing quiescent current to 200µA; grounding SYNC/MODE forces pulse-skipping mode. Frequency foldback to ~35kHz under short-circuit conditions and undervoltage lockout at 2.70V ±0.15V ensure robust protection in battery-depleted scenarios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.85V to 8.5V - supports full discharge range of single Li-ion (2.85V cutoff) and dual-cell configurations. |
| Output Current | 600mA (VIN ≥ 4V) - sufficient for baseband processors, RF transceivers, and sensor subsystems in portable devices. |
| Switching Frequency | 350kHz (internal), synchronizable to 385–550kHz - enables compact 15µH inductors while avoiding AM radio band interference. |
| Feedback Reference | 0.80V ±1% - allows precise regulation of low-voltage rails (e.g., 1.8V, 2.5V, 3.3V) using standard resistor dividers. |
| Quiescent Current | 200µA in Burst Mode - extends battery life in standby/sleep states without compromising wake-up response. |
| Shutdown Current | 11µA (VIN > 3V) - minimizes drain during system off-state, critical for long-term storage in IoT edge nodes. |
| UVLO Threshold | 2.70V ±0.15V - prevents deep discharge damage to lithium-ion cells while ensuring reliable restart above safe voltage. |
| RDS(ON) (P-FET) | 0.7Ω (typ) - limits conduction loss during high-duty-cycle dropout operation near VIN ≈ VOUT. |
Pinout & Package
Package: 8-lead plastic SO (SO-8), 150 mil width, JEDEC MS-012AC compliant. Pin 1 marked with dot; top view shown in datasheet Figure 1b.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH (1) | Error amplifier compensation node | Controls peak inductor current; external RC network here sets loop stability and transient response. |
| RUN/SS (2) | Soft-start timing & shutdown enable | 0.7V threshold enables operation; capacitor to GND sets soft-start ramp time (~0.5s/µF); <0.4V forces shutdown. |
| VFB (3) | Feedback input | Compares against 0.8V internal reference; connects to resistive divider across output for voltage regulation. |
| GND (4) | Power and signal ground | Common return for all internal circuits; must be low-impedance connection to minimize noise coupling. |
| SW (5) | Switch node | Connects to inductor; carries high di/dt switching current; requires tight layout with minimal trace inductance. |
| VIN (6) | Main power input | Supplies internal circuitry and switches; requires local 22µF ceramic decoupling close to pin. |
| SYNC/MODE (7) | External clock sync & operating mode select | Floating/high = Burst Mode; grounded = pulse-skipping mode; TTL/CMOS input accepts 385–550kHz external clock. |
| VREF (8) | Precision 1.19V reference output | ±1% accuracy; stable with ≤2000pF load; usable as bias source for external circuitry or ADC reference. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode - reduces BOM count, improves efficiency by 5–10% at medium loads, and shrinks PCB area. |
| 100% duty cycle operation | Enables dropout regulation down to VIN – IOUT×RDS(ON) - extends runtime in battery-powered systems nearing end-of-discharge. |
| Internal current-mode control | Provides inherent line/load transient immunity without external compensation - simplifies design for fast-response applications like RF PA biasing. |
| Programmable Burst Mode™ | Reduces no-load input current to 200µA - critical for always-on sensors and wearable devices requiring multi-week standby. |
| Integrated 1.19V reference | ±1% initial accuracy, <15mV load regulation - enables accurate auxiliary voltage generation without adding a separate reference IC. |
| Short-circuit frequency foldback | Reduces oscillator frequency to ~35kHz during overload - prevents thermal runaway and inductor saturation under fault conditions. |
Applications
| Cellular Telephones | Portable Instruments |
|---|---|
Use Scenario: Power management for baseband processor core voltage (1.2V–1.8V) and memory I/O rails (2.5V–3.3V) in GSM/UMTS handsets. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated, low-noise DC power; Burst Mode™ maintains ultra-low IQ during idle periods between voice/data bursts. Use Value: Extends talk time by >15% vs. non-synchronous alternatives due to 96% peak efficiency and sub-200µA quiescent draw in sleep mode. | Use Scenario: Supplying analog front-end (AFE), microcontroller, and display backlight in handheld multimeters and gas detectors. IC Role / Device Role / Timing Role: Single-chip power solution replacing discrete buck + LDO combinations; RUN/SS pin enables controlled power sequencing during wake-up from deep sleep. Use Value: Reduces bill-of-materials by eliminating Schottky diode and external reference, while maintaining ±0.5% output accuracy over temperature and load. |
| Wireless Modems | RF Communications |
Use Scenario: Generating clean 3.3V supply for LTE/Wi-Fi baseband ICs and PMU in M2M modules with aggressive size constraints. IC Role / Device Role / Timing Role: High-efficiency synchronous buck converter with SYNC/MODE pin configured for external clock synchronization to avoid RF interference in adjacent bands. Use Value: Enables EMI-compliant layout with 400kHz synchronized switching - eliminates beat frequencies that could modulate sensitive receiver IF stages. | Use Scenario: Biasing low-noise amplifiers (LNAs), mixers, and VCOs in portable SDR transceivers and spectrum analyzers. IC Role / Device Role / Timing Role: Low-ripple, low-noise power source; VREF pin provides stable 1.19V reference for on-board ADCs measuring RF signal strength. Use Value: Achieves <10mVpp output ripple (with 100µF/6.3V output cap) - prevents spurious tones from corrupting sub-1dB NF RF signal chains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRVR | 3-MHz fixed-frequency, 300mA max output, 0.6V reference, 17µA IQ in DCS-Control™ mode | Better suited for ultra-small footprint and higher-frequency filtering; lower current rating limits use in processor cores | Select when board space is constrained and load ≤300mA; not drop-in due to different pinout and control scheme |
| MAX17503GCU+T | Adjustable 200kHz–2.2MHz, 2.5A output, external MOSFETs, 0.8V reference, 100µA IQ | Higher power capability and programmability; requires external FETs and compensation components | Choose for scalable designs needing >600mA or adjustable frequency; adds complexity but improves thermal headroom |
Compared with TPS62231DRVR and MAX17503GCU+T, the LTC1707CS8#PBF offers optimal balance of integration (internal FETs), low-IQ Burst Mode™, and proven reliability in Li-ion portable systems - making it preferred for cost-sensitive, volume-production handhelds where 600mA and SO-8 fit are sufficient.
Availability
LTC1707CS8#PBF is available at Aetrix Electronics and suitable for cellular telephones, portable instruments, wireless modems, and RF communications equipment requiring stable component supply across industrial temperature ranges (–40°C to 85°C).
Supply support for LTC1707CS8#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC1707CS8#PBF belongs to ADI's legacy Linear Technology power management portfolio, specifically engineered for high-efficiency, low-quiescent-current DC/DC conversion in portable battery-operated systems - emphasizing simplicity, reliability, and long operational life.
FAQ
What is the maximum output current capability of the LTC1707CS8#PBF?
The LTC1707CS8#PBF delivers up to 600mA continuous output current when VIN ≥ 4V. Below 4V, output current must be derated per Figures 2a/2b in the datasheet - e.g., ~400mA at VIN = 3.6V for VOUT = 3.3V. This limitation arises from increased conduction losses in the internal P-channel MOSFET at high duty cycles.
How does the LTC1707CS8#PBF achieve high efficiency at light loads?
The LTC1707CS8#PBF achieves high light-load efficiency via Burst Mode™ operation, which disables both internal MOSFETs and partially powers down control circuitry, reducing quiescent current to 200µA. During burst cycles, the output capacitor supplies load current until VOUT drops enough to trigger a new switching burst - minimizing switching losses without audible noise.
Can the LTC1707CS8#PBF operate with an input voltage below 3V?
Yes, the LTC1707CS8#PBF operates down to 2.85V input, making it suitable for deeply discharged single Li-ion cells. At VIN < 3V, it enters dropout mode with 100% duty cycle, regulating VOUT = VIN – IOUT × RDS(ON)P. Undervoltage lockout releases at 2.70V ±0.15V, preventing battery damage.
What is the function of the VREF pin on the LTC1707CS8#PBF?
The VREF pin on the LTC1707CS8#PBF provides a buffered 1.19V ±1% precision reference output, stable with up to 100µA load and 2000pF capacitance. It can power external circuitry (e.g., ADC references, sensor bias networks) or serve as a secondary feedback source - eliminating need for a discrete voltage reference IC in many portable designs.
Is the LTC1707CS8#PBF pin-compatible with other members of the LTC170x family?
No, the LTC1707CS8#PBF is not pin-compatible with LTC1701/LTC1702/LTC1706 variants. While sharing functional similarities, pin assignments differ - e.g., LTC1706 uses different SYNC and ITH configurations. Always verify pinout against the specific datasheet; migration requires PCB layout revision.
LTC1707CS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (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):
- 2.85V
- 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#PBF FAQ
1.How can I place an order for LTC1707CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1707CS8#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 LTC1707CS8#PBF reliable?
The price and inventory of LTC1707CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1707CS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1707CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1707CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1707CS8#PBF?
LTC1707CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1707CS8#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 LTC1707CS8#PBF?
For technical support, including LTC1707CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1707CS8#PBF requirements.
6.How does Aetrix verify that LTC1707CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1707CS8#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 LTC1707CS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1707CS8#PBF?
All LTC1707CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1707CS8#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 LTC1707CS8#PBF part is unused and in its original packaging.
Return procedure for LTC1707CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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