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Analog Devices Inc. LTC1707IS8#TRPBF
- Part No.:
- LTC1707IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1707IS8#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 600MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,366
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Product details
Overview
LTC1707IS8#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency monolithic synchronous step-down switching regulator with current-mode control, 350kHz fixed switching frequency, 0.8V internal reference, and 600mA output capability at VIN ≥ 4V. It operates from 2.85V to 8.5V input, supports Burst Mode™ for ultra-low quiescent current (200µA), and delivers regulated output voltages from 0.8V to VIN in portable lithium-ion battery-powered systems.
For engineers reviewing the LTC1707IS8#TRPBF datasheet, LTC1707IS8#TRPBF pinout, LTC1707IS8#TRPBF application, or LTC1707IS8#TRPBF equivalent, key selection criteria include its 2.85V minimum input voltage for single-cell Li-ion operation, 100% duty cycle dropout mode, selectable Burst Mode vs pulse-skipping operation via SYNC/MODE pin, and integrated P/N-channel MOSFETs eliminating external diode requirements.
Technical Context
The LTC1707IS8#TRPBF implements a constant-frequency current-mode buck architecture with internal synchronous rectification, enabling high efficiency across wide load ranges. Its error amplifier drives the ITH pin to control peak inductor current, while VFB compares feedback against a precision 0.80V ±1% reference. The RUN/SS pin provides soft-start ramping and shutdown control with 0.7V enable threshold.
Frequency synchronization (385–550kHz) disables Burst Mode and forces pulse-skipping operation, suppressing low-frequency ripple in noise-sensitive audio circuits. Undervoltage lockout (2.70V ±0.15V) with 100mV hysteresis protects single-cell batteries from deep discharge, and short-circuit protection reduces oscillator frequency to 35kHz to limit inductor current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.85V to 8.5V - supports single/dual Li-ion battery inputs without external LDO pre-regulation. |
| Output Current | 600mA (VIN ≥ 4V) - sufficient for baseband processors, RF transceivers, and sensor subsystems. |
| Switching Frequency | 350kHz (internal), synchronizable to 385–550kHz - enables compact 15µH inductors and avoids AM radio band interference. |
| Feedback Reference | 0.80V ±1% - allows precise low-voltage outputs (e.g., 1.2V, 1.8V, 2.5V) using standard resistor ratios. |
| Quiescent Current | 200µA in Burst Mode - extends battery runtime in standby or sleep states of portable devices. |
| Shutdown Current | 11µA (VIN = 3–8.5V) - minimizes leakage during system power-off, critical for always-on monitoring functions. |
| RDS(ON) Top/Bottom FET | 0.7Ω / 0.8Ω (typ.) - limits conduction loss at medium loads; combined RSW varies with duty cycle per application equations. |
| Efficiency Peak | 96% at VOUT = 3.3V, VIN = 6V, IOUT = 300mA - achieved by synchronous rectification and optimized gate drive. |
Pinout & Package
Package: 8-lead SO (Small Outline), RoHS-compliant, surface-mount, θJA = 120°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH (Pin 1) | Error amplifier compensation node | Controls peak inductor current; voltage range 0–1.2V; used for external loop compensation or current limiting. |
| RUN/SS (Pin 2) | Soft-start and enable control | Internal 2.25µA current source charges CSS for controlled startup; <0.4V forces shutdown with 11µA IQ. |
| VFB (Pin 3) | Feedback input | Compares resistive divider output against 0.80V reference; 6nA typical input bias enables high-impedance dividers. |
| GND (Pin 4) | Power and signal ground | Common return for SW node, internal circuitry, and feedback network; requires low-impedance PCB plane connection. |
| SW (Pin 5) | Switch node | Connects to inductor; carries high di/dt square-wave current; must be routed with minimal loop area to reduce EMI. |
| VIN (Pin 6) | Main input supply | Supplies internal circuitry and switch drivers; requires local 22µF ceramic decoupling close to pin. |
| SYNC/MODE (Pin 7) | Frequency sync and operating mode select | Floating or tied to VIN enables Burst Mode; grounded forces pulse-skipping; TTL/CMOS input accepts 385–550kHz external clock. |
| VREF (Pin 8) | Precision 1.19V reference output | ±1% accuracy, stable with ≤2000pF load; usable as auxiliary reference for ADCs or comparators in same system. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode, reducing BOM count, board space, and forward-drop losses by ~0.3V. |
| Burst Mode™ operation | Reduces quiescent current to 200µA at light loads while maintaining regulation-critical for battery longevity in IoT sensors. |
| 100% duty cycle dropout | Extends usable battery life down to VOUT + RDS(ON)•IOUT; maintains output when VIN drops near VOUT (e.g., 3.3V out at 3.6V in). |
| Integrated 2.7V UVLO with hysteresis | Prevents brown-out operation and deep discharge of Li-ion cells; 100mV hysteresis ensures clean restart after recovery. |
| External frequency synchronization | Enables EMI reduction by aligning switching noise to fixed bands and avoids beat frequencies in multi-rail systems. |
| Current-mode control | Provides inherent cycle-by-cycle current limiting and superior line/load transient response without external compensation. |
Applications
| Cellular Baseband Power | Portable Instrument Core Supply |
|---|---|
Use Scenario: Powering ARM Cortex-M4 microcontroller and ADC in handheld multimeter with dual Li-ion battery input. IC Role / Device Role / Timing Role: Primary DC/DC converter regulating 1.8V core rail from 3.0–8.4V battery stack; manages dynamic load steps during measurement bursts. Use Value: Burst Mode maintains 200µA IQ during idle, extending battery life beyond 100 hours; 0.8V reference enables accurate 1.8V output via 1% resistors. |
Use Scenario: Supplying 3.3V to RF front-end and digital logic in Bluetooth LE wearable with single Li-ion cell. IC Role / Device Role / Timing Role: Synchronous buck regulator delivering 600mA peak to transceiver during TX bursts; enters dropout below 3.6V input. Use Value: 96% peak efficiency at 300mA reduces thermal load on compact PCB; SYNC/MODE pin disables Burst Mode during audio streaming to suppress sub-audio ripple. |
| Wireless Modem Voltage Scaling | Distributed Point-of-Load Regulation |
Use Scenario: Generating adjustable 1.2V–2.5V rails for configurable baseband IC in LTE modem module. IC Role / Device Role / Timing Role: Programmable output buck converter using external resistor divider; VREF pin supplies reference to DAC controlling VOUT. Use Value: 0.8V feedback reference and 1.19V VREF output allow precise, temperature-stable output programming without trimming. |
Use Scenario: Local 2.5V supply for FPGA I/O banks in industrial gateway with 5V backplane input. IC Role / Device Role / Timing Role: Compact point-of-load regulator placed adjacent to FPGA; uses 15µH inductor and 100µF output cap per layout guidelines. Use Value: 8-lead SO package fits tight spacing; current-mode control rejects 5V rail noise; soft-start (via RUN/SS) prevents inrush into FPGA's large I/O capacitance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8610ACDE#TRPBF | 42V max VIN, 3.5A output, 2MHz switching, Silent Switcher® architecture; higher cost, larger package (16-lead QFN). | Targets automotive and industrial 12V/24V inputs; not suitable for <3V Li-ion operation due to 3.4V min VIN. | Select only if input exceeds 8.5V or output current >600mA is required; incompatible for single-cell battery use. |
| TPS62231DRVR | 2.05–6.5V VIN, 600mA, 3.5MHz, 17µA IQ in DCS-Control™ mode; 6-pin WSON package, no VREF pin. | Optimized for ultra-small footprint and fast transient response in space-constrained wearables; lacks SYNC/MODE flexibility and precision VREF. | Prefer for size-critical designs where 1.19V reference and Burst Mode selection are non-essential; verify UVLO (2.05V) suffices for battery cutoff. |
Compared with LT8610ACDE#TRPBF and TPS62231DRVR, the LTC1707IS8#TRPBF uniquely balances 2.85V minimum input, integrated VREF, programmable Burst Mode, and SO-8 manufacturability-making it optimal for cost-sensitive, battery-powered instrumentation where moderate frequency and proven reliability are prioritized over ultra-high density or extended VIN range.
Availability
LTC1707IS8#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, portable instruments, wireless modems, and distributed power systems requiring stable component supply across industrial temperature ranges (–40°C to 85°C).
Supply support for LTC1707IS8#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 long-term manufacturing commitment for legacy Linear regulators.
The LTC1707IS8#TRPBF belongs to Linear's high-efficiency monolithic DC/DC converter family, designed specifically for battery-powered portable electronics demanding low IQ, wide input range, and robust transient performance without external power diodes.
FAQ
What is the minimum input voltage required for LTC1707IS8#TRPBF to regulate output?
The LTC1707IS8#TRPBF has a guaranteed minimum operating input voltage of 2.85V across the industrial temperature range (–40°C to 85°C). Below this, undervoltage lockout activates and disables switching. At VIN = 2.85V, the device can still deliver regulated output in dropout mode (100% duty cycle) provided VOUT + (RDS(ON)_PCH × IOUT) ≤ VIN. For example, with 3.3V output and 600mA load, RDS(ON) of 0.7Ω adds ~420mV drop, requiring VIN ≥ 3.72V for regulation-so actual minimum VIN depends on load and VOUT.
How does the SYNC/MODE pin affect LTC1707IS8#TRPBF efficiency at light loads?
When the SYNC/MODE pin is floating or tied to VIN, the LTC1707IS8#TRPBF operates in Burst Mode™, achieving 200µA quiescent current and >85% efficiency at 10mA load. When SYNC/MODE is grounded, it forces pulse-skipping mode-efficiency drops to ~75% at 10mA but improves rapidly above 30mA and eliminates low-frequency output ripple. During external synchronization (385–550kHz), Burst Mode is disabled and pulse-skipping applies, trading light-load IQ for EMI control.
Can LTC1707IS8#TRPBF generate an output voltage lower than 0.8V?
No-the LTC1707IS8#TRPBF's internal feedback reference is fixed at 0.80V ±1%, and the device regulates VOUT based on the equation VOUT = 0.8V × (1 + R1/R2). Therefore, the lowest achievable regulated output is 0.8V (when R1 = 0Ω and R2 is omitted or shorted). Attempting sub-0.8V outputs violates the error amplifier's operating range and results in unregulated behavior. For lower outputs, consider the LTC3630 or LTC3631 families with adjustable references.
What is the purpose of the VREF pin on LTC1707IS8#TRPBF, and how much current can it source?
The VREF pin on the LTC1707IS8#TRPBF provides a buffered, precision 1.19V ±1% reference output usable for external circuitry such as ADC references, comparator thresholds, or DAC biasing. It is specified to drive up to 100µA while maintaining ±15mV load regulation (2.3–15mV deviation over 0–100µA). Capacitive loading up to 2000pF is supported without instability, making it suitable for noise-sensitive analog subsystems sharing the same PCB.
Does LTC1707IS8#TRPBF require external compensation components?
The LTC1707IS8#TRPBF features internal compensation optimized for standard 15µH inductors and 100µF output capacitors, so no external compensation is required for basic operation. However, the ITH pin allows optional external Type II or III compensation networks (e.g., series RC from ITH to GND) to improve phase margin in applications with low-ESR ceramic outputs or unusual inductor values. A 47pF capacitor (CC2) is recommended between ITH and GND for noise filtering, per Figure 7 in the datasheet.
LTC1707IS8#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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1707IS8#TRPBF FAQ
1.How can I place an order for LTC1707IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1707IS8#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 LTC1707IS8#TRPBF reliable?
The price and inventory of LTC1707IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1707IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1707IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1707IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1707IS8#TRPBF?
LTC1707IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1707IS8#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 LTC1707IS8#TRPBF?
For technical support, including LTC1707IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1707IS8#TRPBF requirements.
6.How does Aetrix verify that LTC1707IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1707IS8#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 LTC1707IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1707IS8#TRPBF?
All LTC1707IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1707IS8#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 LTC1707IS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1707IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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