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Analog Devices Inc. LTC1707IS8#PBF
- Part No.:
- LTC1707IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1707IS8#PBF.pdf
- Description:
- IC REG BUCK ADJ 600MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:147
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Product details
Overview
LTC1707IS8#PBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC regulator IC with current-mode control, 350kHz fixed switching frequency, 0.8V reference, and 600mA output current capability at VIN ≥ 4V. It integrates P-channel and N-channel MOSFETs, supports Burst Mode™ operation for high light-load efficiency, and delivers low dropout via 100% duty cycle - ideal for single/dual Li-ion battery-powered portable instruments and RF communications systems.
For engineers reviewing the LTC1707IS8#PBF datasheet, LTC1707IS8#PBF pinout, LTC1707IS8#PBF application, or LTC1707IS8#PBF equivalent, key selection criteria include input voltage range (2.85V–8.5V), feedback reference accuracy (0.78V–0.82V), undervoltage lockout threshold (2.70V typ), quiescent current (200µA in Burst Mode), and SO-8 package thermal resistance (θJA = 120°C/W).
Technical Context
The LTC1707IS8#PBF implements a constant-frequency current-mode buck architecture with internal synchronous rectification, eliminating external Schottky diodes. Its error amplifier output (ITH pin) controls peak inductor current, while VFB compares output voltage against a precision 0.8V internal reference.
Burst Mode™ operation enables discontinuous switching at light loads, reducing quiescent current to 200µA; pulse-skipping mode activates when SYNC/MODE is grounded. Frequency synchronization (385–550kHz) disables Burst Mode and enforces PWM operation, suppressing audio-band ripple in noise-sensitive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.85V to 8.5V - supports single-cell (2.85V cutoff) and dual-cell Li-ion battery inputs without external LDO pre-regulation. |
| Output Current | 600mA max at VIN ≥ 4V - derated below 4V per Figure 2a/b; requires inductor and layout optimization for full rating. |
| Feedback Reference | 0.80V ±2.5% (0.78V–0.82V) - enables precise regulation of VOUT ≥ 0.8V using external resistor divider. |
| Switching Frequency | 350kHz (internal), synchronizable to 385–550kHz - balances efficiency, inductor size, and EMI; avoids audio band. |
| Quiescent Current | 200µA in Burst Mode - extends battery runtime in standby; drops to 11µA in shutdown (RUN/SS < 0.4V). |
| UVLO Threshold | 2.70V ±0.15V (2.55V–2.85V) - prevents deep discharge of Li-ion cells; includes 100mV hysteresis for noise immunity. |
| Efficiency Peak | 96% at VOUT = 3.3V, VIN = 6V, IOUT = 300mA - achieved via synchronous rectification and low RDS(ON) FETs (0.5Ω/0.6Ω typ). |
Pinout & Package
Package: 8-lead plastic SO (SO-8), surface-mount, θJA = 120°C/W, TJMAX = 125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH (1) | Error amplifier output / current limit control | 0–1.2V analog interface to set peak inductor current; used for external compensation and soft-start ramp control. |
| RUN/SS (2) | Enable + soft-start control | Pull < 0.4V for shutdown (11µA IQ); capacitor to GND sets soft-start time (~0.5s/µF); internal 2.25µA current source. |
| VFB (3) | Feedback input | Connects to resistive divider across VOUT; regulated to 0.8V; input bias current ≤ 60nA minimizes divider error. |
| GND (4) | Power and signal ground | Common return for SW, VIN decoupling, feedback network, and compensation components; must be low-impedance. |
| SW (5) | Switch node | Drain connection of internal P- and N-channel MOSFETs; high dv/dt node requiring tight layout and minimal trace area. |
| VIN (6) | Main power input | Supplies gate drive and bias circuits; requires local 22µF/16V ceramic or low-ESR capacitor directly to GND (Pin 4). |
| SYNC/MODE (7) | Frequency sync input / mode select | Float or tie to VIN for Burst Mode; ground for pulse-skipping; accept 385–550kHz TTL/CMOS clock for synchronization. |
| VREF (8) | Precision 1.19V reference output | ±1% accuracy (1.178–1.202V), loadable to 100µA; stable with up to 2000pF capacitance; usable for external circuit biasing. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated P- and N-channel MOSFETs eliminate external Schottky diode, improving efficiency by ~5–10% and saving board space. |
| Burst Mode™ operation | Reduces quiescent current to 200µA at light loads while maintaining regulation - critical for battery longevity in portable devices. |
| 100% duty cycle low-dropout | Enables VOUT tracking VIN down to VOUT = VIN − (IPK × RDS(ON)P), extending runtime as battery discharges below VOUT. |
| External frequency synchronization | Locks switching to 385–550kHz external clock, eliminating beat frequencies and enabling EMI reduction in multi-rail systems. |
| Internal soft-start and UVLO | Programmable soft-start via RUN/SS capacitor prevents inrush current; precision 2.7V UVLO protects Li-ion cells from over-discharge. |
Applications
| Cellular Telephones | Portable Instruments |
|---|---|
Use Scenario: Power management in GSM/UMTS handsets with dual Li-ion battery input and multiple rail requirements (core, RF, display). IC Role / Device Role / Timing Role: Primary buck converter delivering 1.8V/2.5V/3.3V system rails with Burst Mode™ active during standby/sleep states. Use Value: 96% peak efficiency and 200µA quiescent current extend talk time and standby duration without compromising transient response. | Use Scenario: Battery-powered handheld test equipment (multimeters, oscilloscopes) requiring stable, low-noise analog and digital supplies. IC Role / Device Role / Timing Role: Synchronous step-down regulator supplying 3.3V logic rail with synchronized switching to avoid interference with sensitive analog front-ends. Use Value: 350kHz fixed frequency and external sync capability suppress audible noise and reduce conducted EMI into measurement circuits. |
| Wireless Modems | RF Communications |
Use Scenario: LTE/Wi-Fi module power supply in embedded IoT gateways operating from 3.6V nominal Li-ion battery. IC Role / Device Role / Timing Role: High-efficiency buck regulator delivering 1.2V core voltage to baseband processor with fast load transient recovery. Use Value: Current-mode control ensures < 50µs recovery from 100mA–500mA load steps, maintaining signal integrity during burst data transmission. | Use Scenario: Powering RF transceivers (e.g., sub-GHz ISM band) where supply ripple directly impacts phase noise and adjacent channel rejection. IC Role / Device Role / Timing Role: Low-ripple, low-noise 3.3V supply generated via pulse-skipping mode (SYNC/MODE grounded) to minimize switching artifacts. Use Value: Pulse-skipping eliminates low-frequency ripple (<10kHz) that would otherwise modulate RF carrier and degrade spectral purity. |
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#PBF | Higher 1.2MHz switching frequency, 1.5A output, integrated compensation; requires smaller inductor but higher gate charge loss. | Better suited for space-constrained designs needing >1A output; less optimal for ultra-low IQ battery standby. | Select LTC3605EDE#PBF when board area is critical and load exceeds 600mA; retain LTC1707IS8#PBF for cost-sensitive, low-IQ portable instruments. |
| TPS62231DRVR | 3MHz fixed frequency, 600mA, 17µA IQ in DCS-Control™ mode; no Burst Mode™, lower UVLO (2.3V), SO-8 compatible pinout. | Superior light-load efficiency in DCS-Control™ but lacks 100% duty cycle dropout and programmable soft-start. | Choose TPS62231DRVR for compact, high-frequency designs with stable input >2.3V; prefer LTC1707IS8#PBF for Li-ion systems requiring robust UVLO and true dropout operation. |
Compared with LTC3605EDE#PBF and TPS62231DRVR, the LTC1707IS8#PBF uniquely combines 100% duty cycle dropout, 2.7V precision UVLO, and Burst Mode™ with SO-8 packaging - making it irreplaceable in legacy Li-ion portable designs where battery protection and extended low-load runtime are mandatory.
Availability
LTC1707IS8#PBF is available at Aetrix Electronics and suitable for cellular telephones, portable instruments, wireless modems, RF communications, and distributed power systems requiring stable component supply across industrial temperature ranges (–40°C to 85°C).
Supply support for LTC1707IS8#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC1707IS8#PBF belongs to Linear's legacy high-efficiency monolithic buck regulator product line, designed specifically for battery-powered portable electronics demanding low quiescent current, wide input range, and robust protection features.
FAQ
What is the maximum output current of the LTC1707IS8#PBF and under what conditions?
The LTC1707IS8#PBF delivers up to 600mA continuous output current when VIN ≥ 4V, ambient temperature is ≤85°C, and proper thermal design (SO-8 θJA = 120°C/W) and PCB layout are implemented. Below 4V input, output current must be derated per Figures 2a/2b - e.g., ~400mA at VIN = 3.6V for VOUT = 3.3V. The LTC1707IS8#PBF achieves this with internal synchronous MOSFETs having RDS(ON) of 0.5Ω (P-FET) and 0.6Ω (N-FET) at –100mA.
How does the LTC1707IS8#PBF achieve high efficiency at light loads?
The LTC1707IS8#PBF achieves high light-load efficiency via Burst Mode™ operation: it discontinuously switches the internal MOSFETs, reducing quiescent current to 200µA while maintaining regulation. When load drops below ~30mA, the ITH voltage falls below 0.12V, triggering sleep mode where both FETs turn off and internal circuitry powers down. The LTC1707IS8#PBF resumes switching only when VOUT droop raises ITH above 0.22V - minimizing average power draw without sacrificing stability.
Can the LTC1707IS8#PBF operate with input voltages below 3V?
Yes, the LTC1707IS8#PBF operates down to 2.85V input, making it suitable for single Li-ion battery applications near end-of-discharge. Its precision 2.7V undervoltage lockout (UVLO) prevents deep discharge, and 100% duty cycle operation allows VOUT to track VIN down to VOUT = VIN − (IPK × RDS(ON)P). At 2.85V input, the LTC1707IS8#PBF maintains regulation for VOUT ≥ 0.8V, though output current is limited (e.g., ~200mA at VOUT = 1.8V per Figure 2a).
What is the function of the SYNC/MODE pin on the LTC1707IS8#PBF?
The SYNC/MODE pin on the LTC1707IS8#PBF serves dual functions: (1) frequency synchronization - accept 385–550kHz TTL/CMOS clock to lock switching and reduce EMI; (2) mode selection - floating or tied to VIN enables Burst Mode™, while grounding forces pulse-skipping mode. During synchronization, Burst Mode™ is inhibited to prevent low-frequency ripple from interfering with audio circuits - a key design feature confirmed in the LTC1707IS8#PBF datasheet.
Does the LTC1707IS8#PBF require an external Schottky diode?
No, the LTC1707IS8#PBF does not require an external Schottky diode because it integrates both a P-channel main switch and an N-channel synchronous rectifier switch. This synchronous rectification eliminates conduction losses associated with external diodes, improves full-load efficiency by ~5–10%, reduces thermal stress, and saves board space. The LTC1707IS8#PBF's internal FETs have typical RDS(ON) values of 0.5Ω (P-FET) and 0.6Ω (N-FET), optimized for 350kHz operation.
LTC1707IS8#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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1707IS8#PBF FAQ
1.How can I place an order for LTC1707IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1707IS8#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 LTC1707IS8#PBF reliable?
The price and inventory of LTC1707IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1707IS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1707IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1707IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1707IS8#PBF?
LTC1707IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1707IS8#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 LTC1707IS8#PBF?
For technical support, including LTC1707IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1707IS8#PBF requirements.
6.How does Aetrix verify that LTC1707IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1707IS8#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 LTC1707IS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1707IS8#PBF?
All LTC1707IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1707IS8#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 LTC1707IS8#PBF part is unused and in its original packaging.
Return procedure for LTC1707IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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