My Inquiry
My Account
Analog Devices Inc. LTC3251EMSE#TRPBF
- Part No.:
- LTC3251EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3251EMSE#TRPBF.pdf
- Description:
- IC REG CHG PUMP ADJ 500MA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,008
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3251EMSE#TRPBF from Analog Devices (formerly Linear Technology) is a 2-phase, spread spectrum charge pump step-down DC/DC converter delivering up to 500mA at fixed 1.5V output from a 2.7V–5.5V input. It eliminates inductors, achieves twice the efficiency of LDOs, and operates in Super Burst mode with only 10µA input current-ideal for space-constrained, battery-powered handheld devices requiring low-noise, high-efficiency power conversion.
For engineers reviewing the LTC3251EMSE#TRPBF datasheet, LTC3251EMSE#TRPBF pinout, LTC3251EMSE#TRPBF application, or LTC3251EMSE#TRPBF equivalent, key selection criteria include its 1.5V fixed output accuracy (±3% over load/temperature), 2-phase spread spectrum operation (1.0–1.6MHz), shutdown disconnect capability, thermally enhanced 10-pin MSOP package with exposed GND pad, and compatibility with ceramic flying/output capacitors only.
Technical Context
The LTC3251EMSE#TRPBF implements dual-phase switched-capacitor fractional conversion using nonoverlapping clocks to transfer charge alternately through two flying capacitors (C1 and C2), enabling continuous input current and halving peak current draw versus single-phase pumps. Regulation is achieved via feedback control of charge pump strength based on FB voltage error.
Its spread spectrum oscillator randomizes switching frequency between 1.0MHz and 1.6MHz to suppress EMI peaks, while three operating modes-Continuous Spread Spectrum, Burst Mode (35µA IIN), and Super Burst Mode (10µA IIN)-dynamically optimize efficiency across load ranges from 0 to 500mA without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5V ±3% (1.44V–1.56V) over 3.5V–5.5V input and 0–500mA load |
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-ion (2.7–4.2V) and 3-cell NiMH (3.0–4.5V) batteries |
| Max Output Current | 500mA in Continuous/Burst Mode; 40mA in Super Burst Mode - defines usable load envelope per mode |
| Quiescent Current | 10µA in Super Burst Mode - enables >1-year battery life in always-on sensor nodes |
| Spread Spectrum Range | 1.0MHz to 1.6MHz - reduces EMI peak amplitude by >20dBm vs fixed-frequency switching |
| Shutdown Current | 0.01µA typical - ensures negligible drain during system sleep |
| Package | 10-pin MSOP with exposed GND pad (θJA = 40°C/W) - enables thermal management in compact layouts |
Pinout & Package
Package: 10-lead plastic MSOP with exposed thermal pad (Pin 11), rated for –40°C to 85°C operation. Exposed pad must be soldered to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MD0 (Pin 1) | Mode Control Input | CMOS logic input (threshold ~0.8V); sets operating mode with MD1 - low/low = shutdown |
| VIN (Pin 2) | Main Power Input | 2.7V–5.5V supply input; requires ≥1µF low-ESR ceramic bypass to GND |
| C1+ (Pin 3) | Flying Capacitor 1 Anode | Connects to positive terminal of 1µF ceramic flying capacitor C1 |
| C1– (Pin 4) | Flying Capacitor 1 Cathode | Connects to negative terminal of C1; polarity reversal occurs - no polarized caps allowed |
| GND (Pins 5, 11) | Power & Thermal Ground | Pins 5 and 11 are internally connected; Pin 11 is exposed thermal pad - must be soldered to PCB GND |
| C2– (Pin 6) | Flying Capacitor 2 Cathode | Connects to negative terminal of 1µF ceramic flying capacitor C2 |
| VOUT (Pin 7) | Regulated Output | 1.5V fixed output; disconnected from VIN during shutdown; requires 10µF low-ESR ceramic capacitor |
| C2+ (Pin 8) | Flying Capacitor 2 Anode | Connects to positive terminal of C2; same polarity constraints as C1+ |
| MD1 (Pin 9) | Mode Control Input | CMOS logic input (threshold ~0.8V); used with MD0 to select all four operating modes |
| MODE (Pin 10) | Spread Spectrum Enable | On LTC3251-1.5 variants: low = spread spectrum enabled; high = fixed 1.6MHz operation |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic components, reduces board area, avoids EMI from inductor ringing and saturation |
| 2-phase spread spectrum | Spreads switching noise over 0.6MHz bandwidth, reducing peak EMI by >20dBm vs fixed-frequency converters |
| Super Burst Mode | Reduces quiescent current to 10µA while maintaining regulation - critical for ultra-low-power wake-up circuits |
| Soft-start circuitry | Linearly ramps output current over ~500µs to limit inrush and prevent input rail collapse during startup |
| Short-circuit & thermal protection | Auto-limits output to ~800mA and cycles off/on above ~160°C junction - prevents damage during fault conditions |
Applications
| Handheld Medical Sensors | Low-Power IoT Edge Nodes |
|---|---|
Use Scenario: Wearable pulse oximeter with Bluetooth LE connectivity operating from a single 3.7V Li-ion cell. IC Role / Device Role / Timing Role: Primary 1.5V supply for analog front-end (AFE) and BLE SoC core logic. Use Value: Enables 500mA peak current delivery without inductors, while Super Burst mode extends battery life beyond 18 months in sleep state. | Use Scenario: Battery-powered environmental sensor node transmitting temperature/humidity data every 5 minutes. IC Role / Device Role / Timing Role: Regulated 1.5V rail for microcontroller, RF transceiver, and precision ADC. Use Value: 10µA shutdown current and 35µA Burst Mode current minimize average power, supporting 5+ year battery life. |
| Portable Audio DAC Supplies | DSP Core Power for Mobile Basebands |
Use Scenario: High-fidelity portable headphone amplifier using a 1.5V low-noise audio DAC. IC Role / Device Role / Timing Role: Ultra-low-noise 1.5V supply for DAC reference and analog output stage. Use Value: Spread spectrum operation reduces switching artifacts in audio band, eliminating need for post-regulation LC filtering. | Use Scenario: 3G/4G baseband processor requiring clean 1.5V core supply in cellular handset design. IC Role / Device Role / Timing Role: Efficient, low-EMI core voltage regulator co-located near DSP die. Use Value: Dual-phase architecture delivers constant input current, minimizing noise coupling into sensitive RF sections. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar charge pump step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8815AETE+T | Fixed 1.5V output; 400mA max; no spread spectrum; uses single-phase charge pump | Higher output ripple and EMI; unsuitable where EMI-sensitive RF coexistence is required | Select when lowest BOM cost and simpler layout are prioritized over EMI performance |
| TLC7660CDR | Voltage inverter only (VOUT = –VIN); no regulation; 20mA output; no burst modes or thermal protection | Cannot replace LTC3251EMSE#TRPBF for step-down regulation - functionally incompatible | Not a functional alternative; only consider for inverting bias supply in auxiliary circuits |
Compared with MAX8815AETE+T and TLC7660CDR, the LTC3251EMSE#TRPBF uniquely combines 500mA 1.5V regulation, spread spectrum EMI reduction, and 10µA Super Burst operation - making it the only viable choice for high-efficiency, low-noise, battery-critical applications demanding full feature parity.
Availability
LTC3251EMSE#TRPBF is available at Aetrix Electronics and suitable for handheld medical sensors, low-power IoT edge nodes, portable audio DAC supplies, and DSP core power applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3251EMSE#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3251EMSE#TRPBF belongs to ADI's legacy Linear Technology µPower DC/DC converter product line, designed specifically for ultra-low-noise, inductorless power delivery in space- and battery-constrained portable electronics.
FAQ
What output voltage does the LTC3251EMSE#TRPBF provide, and is it adjustable?
The LTC3251EMSE#TRPBF provides a fixed 1.5V output with ±3% regulation accuracy across load, line, and temperature. It is not adjustable - unlike the base LTC3251 variant (which uses FB pin and external resistors), this part is factory-configured as the -1.5 version and lacks feedback divider connections. Its VOUT pin delivers precisely 1.5V without external components.
Does the LTC3251EMSE#TRPBF require external inductors?
No, the LTC3251EMSE#TRPBF is an inductorless charge pump converter. It uses two 1µF ceramic flying capacitors (C1 and C2) instead of magnetic components to achieve step-down conversion. This eliminates inductor-related EMI, size, cost, and saturation risks - confirmed in the datasheet's "No Inductors" feature and typical application circuit.
How does spread spectrum operation reduce EMI in the LTC3251EMSE#TRPBF?
The LTC3251EMSE#TRPBF's spread spectrum oscillator randomly varies switching frequency between 1.0MHz and 1.6MHz on a cycle-by-cycle basis. This distributes energy across a 600kHz bandwidth instead of concentrating it at a single fundamental frequency and harmonics - reducing peak EMI amplitude by >20dBm, as verified in Figures 2b/2c of the datasheet.
What are the operating modes of the LTC3251EMSE#TRPBF, and how are they selected?
The LTC3251EMSE#TRPBF has four modes controlled by MD0 (Pin 1) and MD1 (Pin 9): Shutdown (0,0), Spread Spectrum + Burst (0,1), Continuous Spread Spectrum (1,0), and Super Burst (1,1). These CMOS inputs require valid logic levels - floating pins are prohibited. The MODE pin (Pin 10) enables/disables spread spectrum for fixed-frequency operation.
What thermal considerations apply to the LTC3251EMSE#TRPBF in a 10-pin MSOP package?
The LTC3251EMSE#TRPBF uses a thermally enhanced 10-pin MSOP with an exposed GND pad (Pin 11) that must be soldered to a PCB ground plane. With θJA = 40°C/W, proper pad connection is essential to maintain junction temperature below 125°C under 500mA load. Internal thermal shutdown activates at ~160°C and cycles recovery at ~150°C to prevent permanent damage.
LTC3251EMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.9V
- Voltage - Output (Max):
- 1.6V
- Current - Output:
- 500mA
- Frequency - Switching:
- 1MHz ~ 1.6MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LTC3251EMSE#TRPBF FAQ
1.How can I place an order for LTC3251EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3251EMSE#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 LTC3251EMSE#TRPBF reliable?
The price and inventory of LTC3251EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3251EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3251EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3251EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3251EMSE#TRPBF?
LTC3251EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3251EMSE#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 LTC3251EMSE#TRPBF?
For technical support, including LTC3251EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3251EMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3251EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3251EMSE#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 LTC3251EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3251EMSE#TRPBF?
All LTC3251EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3251EMSE#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 LTC3251EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3251EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3251EMSE#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
