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Analog Devices Inc. LTC1701ES5#TRPBF
- Part No.:
- LTC1701ES5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LTC1701ES5#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 500MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,867
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Product details
Overview
LTC1701ES5#TRPBF from Analog Devices (formerly Linear Technology) is a 1MHz, current-mode, step-down DC/DC converter in a 5-lead SOT-23 package. It operates from 2.5V to 5.5V input, delivers up to 500mA output current with internal 0.28Ω PMOS switch, supports adjustable output from 1.25V to 5V, and features Burst Mode™ operation for ultra-low quiescent current (135µA active, <1µA shutdown). It is used in space-constrained portable power rails for digital cameras and cellular handsets.
For engineers reviewing the LTC1701ES5#TRPBF datasheet, LTC1701ES5#TRPBF pinout, LTC1701ES5#TRPBF application, or LTC1701ES5#TRPBF equivalent, key selection criteria include its 1MHz fixed-frequency operation enabling compact external components, OPTI-LOOP™ compensation for stable transient response across capacitor types, and precise 1.25V feedback reference with ±0.03V tolerance over temperature.
Technical Context
The LTC1701ES5#TRPBF employs a constant off-time, current-mode control architecture where switching frequency varies with input-output voltage differential but centers near 1MHz. Its main control loop compares VFB against a 1.25V bandgap reference and adjusts peak inductor current via the ITH/RUN pin voltage (1.25V–2.25V operating range).
Burst Mode™ operation activates below light-load thresholds to reduce gate charge losses, while dropout mode enables 100% duty cycle operation down to VIN = VOUT. The device lacks under-voltage lockout, requiring external shutdown control when VIN falls below 2.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion and dual-cell alkaline inputs without pre-regulation. |
| Switching Frequency | ~1MHz - enables use of sub-2mm-height inductors and low-ESR ceramic/tantalum capacitors. |
| Output Current | Up to 500mA - sustained at high efficiency with internal 0.28Ω (typ.) PMOS switch at VIN = 5V. |
| Feedback Reference | 1.25V ±0.03V - sets output voltage via external resistor divider; enables 1.25V–5V adjustment range. |
| Quiescent Current | 135µA (active), <1µA (shutdown) - extends battery life in always-on portable systems. |
| Peak Switch Current Limit | 0.9A–1.1A - provides overcurrent protection independent of inductor value. |
| Thermal Resistance θJA | 250°C/W - requires careful PCB copper area management for >300mW dissipation. |
Pinout & Package
Package: 5-lead plastic SOT-23 (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm, surface-mount, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch Node | Connects to inductor and Schottky diode cathode; swings from VIN to ~0.3V below GND during conduction. |
| GND (Pin 2) | Power Ground | Reference for all internal circuits; must be low-impedance connection to CIN(–), COUT(–), and diode cathode. |
| VFB (Pin 3) | Feedback Input | High-impedance (±0.1µA) node sensing resistive divider output; regulated to 1.25V nominal. |
| ITH/RUN (Pin 4) | Error Amplifier Output & Run Control | Provides loop compensation node (1.25V–2.25V); pulling below 0.8V forces shutdown; external RC sets soft-start ramp. |
| VIN (Pin 5) | Main Power Input | Supplies internal circuitry and PMOS switch; requires local 0.1µF ceramic + bulk capacitor; absolute max 6V. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP™ Compensation | Enables stable closed-loop response across diverse output capacitor types (tantalum, POSCAP, ceramic) without redesign. |
| Burst Mode™ Operation | Reduces light-load quiescent current to 135µA while maintaining regulation; eliminates audible coil whine in portable devices. |
| 100% Duty Cycle Dropout | Permits VOUT = VIN operation with minimal headroom loss-critical for battery-powered systems nearing end-of-life. |
| Internal 0.28Ω PMOS Switch | Eliminates external high-side switch; reduces BOM count and layout complexity while supporting 500mA continuous output. |
| Short-Circuit Protection | Current-limiting architecture prevents damage during output faults; maintains safe thermal profile under sustained overload. |
Applications
| Digital Camera Power Rail | Cellular Handset Core Logic Supply |
|---|---|
Use Scenario: Powers image sensor and ISP core logic in compact digital cameras with tight height constraints (≤2mm component stackup). IC Role / Device Role / Timing Role: Primary step-down regulator converting 3.7V Li-ion battery to 2.5V/500mA rail with fast load transient response to burst capture events. Use Value: 1MHz switching allows use of 4.7µH/2mm-height inductor and 47µF POSCAP output capacitor, minimizing board area to <0.3 in². | Use Scenario: Supplies baseband processor core voltage in GSM/UMTS handsets where battery voltage ranges from 4.2V (full) to 3.2V (discharged). IC Role / Device Role / Timing Role: Adjustable buck converter set to 1.8V output; maintains regulation through full battery discharge using 100% duty cycle dropout mode. Use Value: Burst Mode™ reduces no-load IQ to 135µA, extending standby time; shutdown current <1µA enables deep-sleep power gating. |
| Portable Media Player Audio Codec Supply | PDA Application Processor I/O Rail |
Use Scenario: Generates clean 3.3V supply for stereo audio DAC/ADC in flash-based media players with aggressive size targets. IC Role / Device Role / Timing Role: High-efficiency (94% typ. at 3.3V/300mA) buck converter with low output ripple (<100mV) achieved via optimized ESR/COUT selection. Use Value: OPTI-LOOP™ ensures stability with low-ESR ceramic + tantalum hybrid output capacitance, eliminating audible noise in audio path. | Use Scenario: Provides configurable 1.5V–3.3V I/O voltage for ARM-based PDA processors with dynamic voltage scaling requirements. IC Role / Device Role / Timing Role: Feedback-controlled buck regulator with external resistor divider; supports multiple voltage configurations via BOM change only. Use Value: 1.25V precision reference (±0.03V) enables accurate output setting across temperature; ITH/RUN pin allows synchronized power sequencing with system controller. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | Fixed 3.3V output; 3MHz switching; 600mA rated; requires external compensation components. | Not adjustable; higher frequency demands smaller L/C but increases EMI sensitivity and gate drive losses. | Select when fixed 3.3V output suffices and board space permits tighter EMI filtering; not suitable for variable-output designs. |
| MAX17222ELT+T | 1.2V fixed output; 2.5MHz switching; 500mA rated; integrated compensation; 0.9V min input. | Lower input voltage capability enables single-cell NiMH use; fixed output limits flexibility in multi-rail systems. | Choose for ultra-low-input applications (0.9V–5.5V) where 1.2V rail is acceptable; lacks adjustable feedback for custom voltages. |
Compared with TPS62231DRYR and MAX17222ELT+T, the LTC1701ES5#TRPBF offers unique adjustability (1.25V–5V), proven OPTI-LOOP™ stability with mixed capacitor types, and industry-standard SOT-23 footprint-making it preferred for legacy portable designs requiring design continuity and broad output flexibility.
Availability
LTC1701ES5#TRPBF is available at Aetrix Electronics and suitable for digital camera power rails, cellular handset core supplies, and portable media player audio codec regulation requiring stable component supply and long-term industrial availability.
Supply support for LTC1701ES5#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 its high-performance analog and power management portfolio. Linear pioneered precision DC/DC conversion for portable electronics.
The LTC1701ES5#TRPBF belongs to Linear's early-generation high-frequency buck converter family, designed specifically for space-constrained, battery-powered applications demanding high efficiency at light loads and robust transient performance.
FAQ
What is the maximum output current capability of the LTC1701ES5#TRPBF?
The LTC1701ES5#TRPBF delivers up to 500mA continuous output current with high efficiency, enabled by its internal 0.28Ω (typ.) PMOS switch at VIN = 5V. Peak switch current is internally limited to 0.9A–1.1A, providing overcurrent protection. Actual achievable current depends on thermal design, input voltage, and output voltage-e.g., at VIN = 3.3V and VOUT = 1.8V, derating may apply due to increased RDS(ON) and duty cycle.
Does the LTC1701ES5#TRPBF support adjustable output voltage?
Yes, the LTC1701ES5#TRPBF supports fully adjustable output voltage from 1.25V to 5V using an external resistor divider connected to the VFB pin. The output is calculated as VOUT = 1.25V × (1 + R2/R1), where the 1.25V reference has a tolerance of ±0.03V over temperature. This adjustability makes LTC1701ES5#TRPBF suitable for multi-rail systems requiring precise, configurable voltages.
How does Burst Mode™ operation improve efficiency in the LTC1701ES5#TRPBF?
Burst Mode™ operation in the LTC1701ES5#TRPBF reduces gate charge losses at light loads by intermittently enabling the main control loop only when output voltage droops below regulation. This lowers active-mode quiescent current to 135µA and shutdown current to <1µA-extending battery life in standby or low-activity states. Unlike continuous-mode alternatives, LTC1701ES5#TRPBF avoids audible noise and maintains regulation without sacrificing light-load efficiency.
What is the role of the ITH/RUN pin on the LTC1701ES5#TRPBF?
The ITH/RUN pin on the LTC1701ES5#TRPBF serves two critical functions: it acts as the error amplifier output for loop compensation (operating 1.25V–2.25V), and as a run/shutdown control input (pull below 0.8V to disable). An external RC network on this pin enables soft-start and power sequencing. Its dual role simplifies design by integrating compensation and enable logic into one node-eliminating need for separate EN and COMP pins found in many competing regulators.
Can the LTC1701ES5#TRPBF operate in dropout mode, and what does that mean for system design?
Yes, the LTC1701ES5#TRPBF supports 100% duty cycle dropout operation, allowing VOUT to track VIN when input voltage falls near or below the regulated output. This is essential for maximizing runtime in battery-powered systems as the cell discharges. However, LTC1701ES5#TRPBF lacks under-voltage lockout, so external circuitry must ensure VIN stays ≥2.5V or force shutdown below that threshold to prevent unregulated operation.
LTC1701ES5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- 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):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 500mA
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
LTC1701ES5#TRPBF FAQ
1.How can I place an order for LTC1701ES5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1701ES5#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 LTC1701ES5#TRPBF reliable?
The price and inventory of LTC1701ES5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1701ES5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1701ES5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1701ES5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1701ES5#TRPBF?
LTC1701ES5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1701ES5#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 LTC1701ES5#TRPBF?
For technical support, including LTC1701ES5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1701ES5#TRPBF requirements.
6.How does Aetrix verify that LTC1701ES5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1701ES5#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 LTC1701ES5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1701ES5#TRPBF?
All LTC1701ES5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1701ES5#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 LTC1701ES5#TRPBF part is unused and in its original packaging.
Return procedure for LTC1701ES5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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