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Analog Devices Inc. LTC1701BES5#TRMPBF
- Part No.:
- LTC1701BES5#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LTC1701BES5#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 500MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,550
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Product details
Overview
LTC1701BES5#TRMPBF from Analog Devices (formerly Linear Technology) is a 1MHz, current-mode, step-down DC/DC converter IC in a 5-lead SOT-23 package. It operates from 2.5V to 5.5V input, delivers up to 500mA output current, features 0.28Ω internal P-channel MOSFET switch, and supports adjustable output voltages from 1.25V to 5V. It is used in portable digital cameras and cellular phones for compact, high-frequency power conversion.
For engineers reviewing the LTC1701BES5#TRMPBF datasheet, LTC1701BES5#TRMPBF pinout, LTC1701BES5#TRMPBF application, or LTC1701BES5#TRMPBF equivalent, key selection criteria include continuous-mode light-load operation (vs. Burst Mode in LTC1701), 1.25V feedback reference accuracy, 500ns typical off-time, OPTI-LOOP™ compensation flexibility, and thermal performance under dropout conditions.
Technical Context
The LTC1701BES5#TRMPBF uses a constant-off-time, current-mode control architecture with an internal 0.28Ω P-channel MOSFET switch and 1.25V precision bandgap reference. Its ITH/RUN pin serves dual roles: error amplifier compensation node and RUN control input, enabling soft-start and shutdown with <1µA quiescent current.
Unlike the LTC1701, the LTC1701B variant operates continuously down to very low load currents-eliminating Burst Mode switching to minimize output voltage ripple at the expense of light-load efficiency. It maintains stable regulation across –40°C to 85°C ambient temperature with no minimum load requirement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion and 3.3V/5V system rails without external LDO pre-regulation. |
| Switching Frequency | 1MHz fixed - enables use of sub-2mm-height inductors and small ceramic/input capacitors for space-constrained PCBs. |
| Max Output Current | 500mA - sustained delivery with internal switch RDS(ON) = 0.28Ω @ 5V VIN ensures low conduction loss at full load. |
| Feedback Reference | 1.25V ±0.03V - sets output voltage via external resistor divider (VOUT = 1.25V × (1 + R2/R1)) with tight line/load regulation. |
| Shutdown Current | <1µA - enables ultra-low-power system sleep states without external disconnect circuitry. |
| Operating Temp Range | –40°C to +85°C - qualified for industrial and portable consumer environments with no derating required. |
| Package | 5-Lead SOT-23 - footprint-compatible with standard pick-and-place equipment; θJA = 250°C/W on minimal copper. |
Pinout & Package
Package: 5-Lead Plastic SOT-23 (JEDEC MO-178AA), 1.6mm × 2.8mm × 1.3mm body, gull-wing leads, RoHS-compliant, tape-and-reel (TRMPBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SW | Switch Node | Connects to inductor and cathode of external Schottky diode; swings from VIN to ~0.3V below GND during conduction. |
| 2 - GND | Power Ground | Reference return for VFB, ITH/RUN, and internal circuits; must be low-impedance connection to CIN and COUT negative terminals. |
| 3 - VFB | Feedback Input | High-impedance (±0.1µA) node sensing divided output voltage; regulates to 1.25V with ±0.03V tolerance over temp. |
| 4 - ITH/RUN | Error Amp Output / RUN Control | Compensation node (R3/C3 filter) and logic-level enable: <0.8V = shutdown; 1.25–2.25V = active regulation. |
| 5 - VIN | Main Power Input | Supplies internal circuitry and switch driver; requires local 0.1–1µF ceramic decoupling close to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Continuous Light-Load Operation | LTC1701B variant avoids Burst Mode to maintain low-output-ripple performance down to µA loads-critical for noise-sensitive analog/RF sections. |
| OPTI-LOOP™ Compensation | External R3/C3 network on ITH/RUN pin allows loop stability optimization across wide range of output capacitor types (tantalum, POSCAP, ceramic) and values. |
| 100% Duty Cycle Dropout | Internal PMOS remains fully on when VIN ≤ VOUT, sustaining regulated output with minimal headroom-enables battery brownout operation without reset. |
| Short-Circuit Protection | Peak switch current limit (0.9–1.1A) combined with cycle-by-cycle current sensing prevents damage during output faults or startup into heavy capacitive loads. |
| Low Quiescent Current | 135µA typical operating supply current (LTC1701) and <1µA shutdown draw extend battery life in always-on portable devices. |
Applications
| Digital Camera Power Supply | Cellular Phone Baseband Core |
|---|---|
Use Scenario: Powers image sensor and ISP core in compact digital cameras requiring clean 2.5V/500mA rail with minimal board area. IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated voltage with fast transient response to handle burst-mode sensor readout current spikes. Use Value: 1MHz switching enables use of 4.7µH inductor <2mm height; OPTI-LOOP™ ensures stable regulation despite varying capacitive load from sensor interface. | Use Scenario: Supplies baseband processor core in GSM/UMTS handsets where low-noise, ripple-sensitive 1.8V/300mA rail is required. IC Role / Device Role / Timing Role: Continuous-mode DC/DC converter providing low-ripple output without Burst Mode artifacts that could interfere with RF receiver sensitivity. Use Value: LTC1701B's absence of light-load switching eliminates sub-harmonic noise; 0.28Ω RDS(ON) minimizes dropout loss during battery sag. |
| PDA System Rail | PC Card Interface Regulator |
Use Scenario: Generates 3.3V/400mA for PDA main logic and display controller in thermally constrained handheld enclosure. IC Role / Device Role / Timing Role: High-efficiency buck converter supporting dynamic voltage scaling and deep-sleep modes via ITH/RUN-controlled shutdown. Use Value: <1µA shutdown current preserves battery during standby; 5-lead SOT-23 occupies <0.3 in² total PCB area including passives. | Use Scenario: Provides isolated 5V/200mA rail for PCMCIA/CardBus interface logic in portable computing accessories. IC Role / Device Role / Timing Role: Compact, self-contained step-down regulator meeting PC Card mechanical height limits (<2.5mm) and EMI requirements. Use Value: 1MHz operation allows use of tiny 2.2µH inductor and 10µF TAIYO YUDEN MLCC input cap; no external FET or controller needed. |
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 |
|---|---|---|---|
| LTC1701ES5#TRMPBF | Burst Mode enabled; 135µA active IQ; same pinout/package; lower light-load efficiency but reduced output ripple at medium loads. | Suitable for battery-powered systems prioritizing runtime over ripple, e.g., media players with variable audio codec loads. | Select LTC1701ES5#TRMPBF when light-load efficiency > low-noise priority; verify ripple tolerance in final layout. |
| TPS62231DRVR | 3MHz switching; 0.45A max; 2.05V–6.5V input; integrated synchronous rectifier; different pinout (6-pin WSON). | Enables smaller magnetics and higher efficiency at mid-to-high loads; not pin-compatible; requires PCB redesign. | Choose TPS62231DRVR only if 3MHz frequency and sync rectification justify layout change and qualification effort. |
Compared with LTC1701ES5#TRMPBF, the LTC1701BES5#TRMPBF trades light-load efficiency for ripple-free regulation-making it preferable in noise-critical signal chains. Against TPS62231DRVR, it offers proven reliability in legacy portable designs but lacks synchronous rectification and higher-frequency operation.
Availability
LTC1701BES5#TRMPBF is available at Aetrix Electronics and suitable for digital cameras, cellular phones, and handheld medical devices requiring stable component supply with long-term lifecycle support.
Supply support for LTC1701BES5#TRMPBF 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 portfolio of high-performance analog and power management ICs with rigorous automotive and industrial qualification.
The LTC1701BES5#TRMPBF belongs to Linear's legacy µPower DC/DC converter family, designed specifically for space- and efficiency-constrained portable electronics where minimal solution size and robust transient response are essential.
FAQ
What is the key functional difference between LTC1701BES5#TRMPBF and LTC1701ES5#TRMPBF?
The LTC1701BES5#TRMPBF operates continuously down to very low load currents, eliminating Burst Mode switching to minimize output voltage ripple. In contrast, the LTC1701ES5#TRMPBF enters Burst Mode below ~10mA load to improve light-load efficiency-introducing low-frequency ripple. Both share identical pinout, package, and electrical specs except for this operational mode distinction.
Can LTC1701BES5#TRMPBF be used with ceramic output capacitors?
Yes, LTC1701BES5#TRMPBF supports ceramic output capacitors via its OPTI-LOOP™ compensation architecture. The ITH/RUN pin allows external RC network tuning to stabilize the control loop across low-ESR ceramics. However, designers must verify phase margin over temperature and load using the ITH pin as a test point, as ceramic ESL can shift resonance and reduce stability margins.
What is the maximum achievable output current for LTC1701BES5#TRMPBF at 3.3V input and 2.5V output?
At 3.3V input and 2.5V output, LTC1701BES5#TRMPBF delivers up to 500mA continuously under typical conditions (TA = 25°C, 1 oz copper, no airflow). Derating applies above 60°C ambient due to thermal limits: junction temperature must remain ≤125°C, and RDS(ON) increases to ~0.30Ω at 3.3V VIN, raising conduction loss.
How does the ITH/RUN pin function in LTC1701BES5#TRMPBF during startup and regulation?
During startup, an external pull-up resistor (e.g., 1MΩ from VIN) charges the ITH/RUN node; when voltage reaches ~0.8V, the device enables regulation and the error amplifier drives ITH/RUN to 1.25–2.25V. During normal operation, ITH/RUN voltage modulates with load to adjust peak inductor current-serving as both compensation node and real-time control signal for the current-mode loop.
Is LTC1701BES5#TRMPBF compatible with 1.8V output voltage setting?
Yes, LTC1701BES5#TRMPBF supports 1.8V output using the standard feedback divider formula: VOUT = 1.25V × (1 + R2/R1). For 1.8V, a common solution is R1 = 121kΩ and R2 = 53.6kΩ (1% tolerance). Layout best practices require routing the VFB trace away from noisy nodes (SW, inductor) and minimizing parasitic capacitance to preserve regulation accuracy.
LTC1701BES5#TRMPBF 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
LTC1701BES5#TRMPBF FAQ
1.How can I place an order for LTC1701BES5#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1701BES5#TRMPBF 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 LTC1701BES5#TRMPBF reliable?
The price and inventory of LTC1701BES5#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1701BES5#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC1701BES5#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1701BES5#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1701BES5#TRMPBF?
LTC1701BES5#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1701BES5#TRMPBF 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 LTC1701BES5#TRMPBF?
For technical support, including LTC1701BES5#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1701BES5#TRMPBF requirements.
6.How does Aetrix verify that LTC1701BES5#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC1701BES5#TRMPBF 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 LTC1701BES5#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC1701BES5#TRMPBF?
All LTC1701BES5#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1701BES5#TRMPBF, 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 LTC1701BES5#TRMPBF part is unused and in its original packaging.
Return procedure for LTC1701BES5#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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