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Analog Devices Inc. LTC1701ES5#TRMPBF
- Part No.:
- LTC1701ES5#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LTC1701ES5#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 500MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,070
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Product details
Overview
LTC1701ES5#TRMPBF 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 0.28Ω internal 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#TRMPBF datasheet, LTC1701ES5#TRMPBF pinout, LTC1701ES5#TRMPBF application, or LTC1701ES5#TRMPBF equivalent, key selection criteria include input voltage range (2.5–5.5V), peak switch current threshold (0.9–1.1A), feedback reference voltage (1.22–1.28V), OPTI-LOOP™ compensation capability, and thermal resistance (θJA = 250°C/W).
Technical Context
The LTC1701ES5#TRMPBF employs a constant off-time, current-mode control architecture with an internal 1.25V bandgap reference and error amplifier driving the ITH/RUN pin. Its switching frequency is determined by VIN, VOUT, and a fixed ~500ns off-time-not by inductor value-enabling stable 1MHz operation with minimal external components.
It integrates a 0.28Ω PMOS main switch and uses external Schottky diode synchronous rectification. The ITH/RUN pin serves dual roles: compensation node for loop stability tuning and RUN control input (shut down below 0.8V). Burst Mode™ operation disables the main control loop under light load to reduce gate charge losses, while continuous conduction mode (LTC1701B variant) maintains low ripple at expense of efficiency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion, 3.3V, and 5V rail inputs without external regulators. |
| Output Current | Up to 500mA - sufficient for core logic, memory, and peripheral ICs in handheld devices. |
| Switch RDS(ON) | 0.28Ω at VIN = 5V - minimizes conduction loss and dropout voltage during high-current operation. |
| Feedback Reference | 1.25V (typ), ±30mV over temp - sets precise output voltage via external resistor divider (VOUT = 1.25V × (1 + R2/R1)). |
| Quiescent Current | 135µA (active), <1µA (shutdown) - extends battery life in always-on or standby modes. |
| Switching Frequency | 1MHz (fixed) - enables use of compact 2mm-height inductors and ceramic capacitors, reducing PCB area to <0.3 in². |
| Peak Switch Current | 0.9–1.1A - provides robust overload margin and short-circuit protection headroom. |
Pinout & Package
Package: 5-lead plastic SOT-23 (JEDEC MO-178AA), 1.6mm × 2.9mm × 1.1mm, θJA = 250°C/W on standard FR-4 board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch Node | Connects to inductor and cathode of external Schottky diode; swings from VIN to ~0.3V below GND during conduction. |
| GND (Pin 2) | Power Ground | Reference return for CIN, COUT, diode cathode, and internal circuitry; must be low-impedance star point. |
| VFB (Pin 3) | Feedback Input | Monitors divided output voltage; internal 1.25V reference compares against this node to regulate VOUT. |
| ITH/RUN (Pin 4) | Error Amplifier Output & RUN Control | Drives loop compensation network; pulling below 0.8V forces shutdown; ramping enables soft-start and sequencing. |
| VIN (Pin 5) | Main Power Input | Supplies internal circuitry and PMOS switch; requires local 0.1–1µF ceramic decoupling close to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ Operation | Reduces quiescent current to 135µA at light loads by intermittently disabling main control loop-critical for battery runtime in standby. |
| OPTI-LOOP™ Compensation | Allows transient response optimization across wide load and output capacitor ranges-including low-ESR ceramics-without redesigning feedback network. |
| 100% Duty Cycle Dropout | Enables low-dropout operation (VOUT ≈ VIN) when input falls near output, preserving regulation during brownout conditions. |
| Internal 0.28Ω PMOS Switch | Eliminates need for external high-side switch; reduces BOM count and layout complexity while maintaining >94% peak efficiency. |
| Short-Circuit Protection | Current-limiting architecture limits peak switch current to 0.9–1.1A, preventing damage during output faults or startup into heavy capacitive loads. |
Applications
| Digital Camera Power Rail | Cellular Handset Core Logic Supply |
|---|---|
Use Scenario: Powers image sensor interface, ISP, and flash memory 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 for processor core and memory subsystem. Use Value: 1MHz switching allows use of 4.7µH/2mm-height inductor and 10µF/47µF POSCAP output caps, enabling full solution in <0.3 in² PCB area. | Use Scenario: Supplies baseband processor and RF transceiver in GSM/EDGE handsets requiring fast load transient response and low-noise output. IC Role / Device Role / Timing Role: High-efficiency buck converter delivering 1.8V/500mA from 3.3V system rail with <100mV output ripple under 100mA–500mA dynamic load steps. Use Value: OPTI-LOOP™ compensation ensures stable regulation with 330pF compensation cap and 47µF tantalum output capacitor, meeting EMI and noise specs for RF sections. |
| PDA/Palmtop PC System Rail | PC Card (PCMCIA) Interface Supply |
Use Scenario: Generates 3.3V/500mA for microcontroller, display driver, and USB PHY in palm-sized computing devices with aggressive thermal limits. IC Role / Device Role / Timing Role: Main system power converter operating from 5V bus or battery, featuring ultralow shutdown current (<1µA) for deep sleep states. Use Value: 135µA quiescent current and <1µA shutdown extend battery life beyond 100 hours in suspend mode without compromising wake-up time. | Use Scenario: Provides regulated 3.3V supply to PCMCIA card slots in laptops and industrial controllers, where hot-plug events demand robust fault handling. IC Role / Device Role / Timing Role: Isolated buck regulator powering card interface logic; withstands repeated short-circuit events during insertion/removal. Use Value: Built-in short-circuit protection and 0.28Ω RDS(ON) limit fault current to safe levels, eliminating need for external current-limiting FETs or fuses. |
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 | 3MHz fixed-frequency, 600mA output, 0.45Ω switch, 22µA IQ (no Burst Mode) | Higher frequency enables smaller inductors but lower efficiency at 500mA due to higher switching losses | Prefer for ultra-compact designs where size outweighs efficiency; not drop-in due to different pinout and control scheme |
| MAX1701ESA+ | 1.5MHz, 600mA, 0.35Ω switch, 100µA IQ, no integrated compensation | Requires external compensation network; lacks OPTI-LOOP™ adaptive tuning for ceramic caps | Choose when design requires manual loop tuning or compatibility with legacy MAX1701 layouts; same SOT-23 footprint but different pin mapping |
Compared with LTC1701ES5#TRMPBF, TPS62231DRYR offers smaller passive size at cost of reduced light-load efficiency and no Burst Mode™, while MAX1701ESA+ trades integrated compensation for greater loop design flexibility but demands more layout effort and validation.
Availability
LTC1701ES5#TRMPBF is available at Aetrix Electronics and suitable for digital camera power rails, cellular handset core supplies, and PDA system rails requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC1701ES5#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and consumer markets.
The LTC1701ES5#TRMPBF belongs to Linear's legacy µPower™ DC/DC converter family, designed specifically for space- and battery-constrained portable electronics requiring high efficiency, small footprint, and robust light-load performance.
FAQ
What is the maximum output current capability of the LTC1701ES5#TRMPBF?
The LTC1701ES5#TRMPBF delivers up to 500mA of continuous output current under typical conditions (VIN = 3.3V, VOUT = 2.5V, TA = 25°C). Its peak switch current threshold is specified at 0.9–1.1A, providing headroom for transient loads and short-circuit limiting. Actual sustained current depends on thermal design: with θJA = 250°C/W and TJMAX = 125°C, it can deliver 500mA continuously at TA ≤ 85°C using adequate copper area.
Does the LTC1701ES5#TRMPBF support adjustable output voltage?
Yes, the LTC1701ES5#TRMPBF supports fully adjustable output voltage from 1.25V to 5V using an external resistive divider connected to the VFB pin. The output is set by VOUT = 1.25V × (1 + R2/R1), where the internal 1.25V reference is trimmed to ±30mV over temperature. A 5pF capacitor across R1 may be added for noise immunity, though it degrades load-step response.
How does Burst Mode™ operation improve efficiency in the LTC1701ES5#TRMPBF?
Burst Mode™ operation in the LTC1701ES5#TRMPBF reduces gate charge losses by disabling the main control loop when load current drops below the level required for continuous conduction. This lowers quiescent current to 135µA (vs. 300µA in active mode) and cuts shutdown current to <1µA, significantly extending battery life in standby or low-power states without sacrificing regulation accuracy.
What is the role of the ITH/RUN pin on the LTC1701ES5#TRMPBF?
The ITH/RUN pin on the LTC1701ES5#TRMPBF serves two critical functions: it is the output of the internal error amplifier (used for OPTI-LOOP™ compensation network connection) and the RUN control input. Pulling this pin below 0.8V forces shutdown (<1µA IQ); ramping it from 0V to 1.7V enables soft-start and power sequencing. Its nominal operating range is 1.25V to 2.25V during regulation.
Can the LTC1701ES5#TRMPBF operate in dropout mode?
Yes, the LTC1701ES5#TRMPBF supports 100% duty cycle dropout operation, allowing VOUT to track VIN when input voltage approaches or falls below the regulated output. In this mode, the internal PMOS switch remains continuously on, minimizing dropout voltage. However, no under-voltage lockout is included-designers must externally shut down the device if VIN falls below 2.5V to prevent unregulated operation.
LTC1701ES5#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
LTC1701ES5#TRMPBF FAQ
1.How can I place an order for LTC1701ES5#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1701ES5#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 LTC1701ES5#TRMPBF reliable?
The price and inventory of LTC1701ES5#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1701ES5#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC1701ES5#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1701ES5#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1701ES5#TRMPBF?
LTC1701ES5#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1701ES5#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 LTC1701ES5#TRMPBF?
For technical support, including LTC1701ES5#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1701ES5#TRMPBF requirements.
6.How does Aetrix verify that LTC1701ES5#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC1701ES5#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 LTC1701ES5#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC1701ES5#TRMPBF?
All LTC1701ES5#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1701ES5#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 LTC1701ES5#TRMPBF part is unused and in its original packaging.
Return procedure for LTC1701ES5#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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