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Analog Devices Inc. LTC3250ES6-1.5#TRPBF
- Part No.:
- LTC3250ES6-1.5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC3250ES6-1.5#TRPBF.pdf
- Description:
- IC REG CHARGE PUMP 1.5V TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,715
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Product details
Overview
LTC3250ES6-1.5#TRPBF from Analog Devices (formerly Linear Technology) is a 1.5V ±4%, 250mA inductorless charge-pump DC/DC step-down converter in a 6-pin SOT-23 package, operating from 3.1V to 5.5V input and delivering 81% efficiency at 100mA from Li-Ion input - used for low-noise core supply in handheld medical instruments and digital cameras.
For engineers reviewing the LTC3250ES6-1.5#TRPBF datasheet, LTC3250ES6-1.5#TRPBF pinout, LTC3250ES6-1.5#TRPBF application, or LTC3250ES6-1.5#TRPBF equivalent, key selection criteria include its 1.5MHz constant-frequency operation, Burst Mode® for light-load efficiency, shutdown disconnect, soft-start, and thermal/short-circuit protection - all within a 1mm-profile ThinSOT™ package.
Technical Context
The LTC3250ES6-1.5#TRPBF uses a 2-phase nonoverlapping switched-capacitor architecture to achieve 2:1 fractional voltage conversion without inductors, delivering regulated 1.5V output by modulating charge pump current via internal error amplifier feedback. Its fixed 1.5MHz oscillator enables predictable EMI filtering and low input noise versus conventional charge pumps.
Burst Mode® operation activates below ~30mA load to reduce quiescent current to 35µA (typ), while soft-start limits inrush over ~500µs. Shutdown disconnects VOUT from VIN, and built-in thermal shutdown (>160°C) and short-circuit limiting (~500mA) ensure robustness in portable battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.5V ±4% (1.44V–1.56V) - tight regulation supports stable 1.5V logic/core rails |
| Max Output Current | 250mA - sufficient for low-power DSPs and camera sensor interfaces |
| Input Voltage Range | 3.1V to 5.5V - compatible with single-cell Li-Ion (3.2–4.2V) and 3-cell NiMH |
| Switching Frequency | 1.5MHz (1.2–1.8MHz) - enables compact ceramic filtering and low conducted noise |
| Quiescent Current | 35µA (typ) - extends battery life in always-on monitoring functions |
| Shutdown Current | <1µA - preserves battery during extended sleep modes |
| Efficiency @100mA | 81% (Li-Ion to 1.5V) - doubles LDO efficiency, reducing thermal load |
| Output Ripple | 4mVP-P (continuous mode), 12mVP-P (Burst Mode) - meets low-noise analog supply requirements |
Pinout & Package
Package: 6-pin ThinSOT™ (S6), 1mm profile, JEDEC MO-193 compliant, 2.80mm × 1.90mm footprint with exposed pad not present - optimized for space-constrained portable PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Input power supply | Accepts 3.1–5.5V; requires ≥1µF low-ESR ceramic bypass to ground |
| GND (Pin 2) | Power and signal reference | Must connect to solid ground plane for thermal management and noise control |
| SHDN (Pin 3) | Active-low enable control | CMOS input; logic low (<0.4V) disables device and disconnects VOUT from VIN |
| C– (Pin 4) | Flying capacitor negative terminal | Connects to negative side of 1µF ceramic flying cap; polarity-sensitive - no tantalum |
| VOUT (Pin 5) | Regulated output | Delivers 1.5V ±4%; requires ≥4.7µF low-ESR ceramic bypass for stability and ripple suppression |
| C+ (Pin 6) | Flying capacitor positive terminal | Connects to positive side of 1µF ceramic flying cap; high dv/dt node - minimize trace length |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic components and EMI from inductors - simplifies layout and reduces BOM count |
| Constant-frequency 1.5MHz operation | Enables predictable input/output filtering and lower conducted noise vs variable-frequency charge pumps |
| Burst Mode® efficiency enhancement | Maintains >75% efficiency down to 1mA load - critical for intermittent-sensing applications |
| Soft-start circuitry | Linearly ramps output current over ~500µs - prevents inrush-induced voltage droop on shared battery rails |
| Full protection suite | Includes short-circuit current limit (~500mA), thermal shutdown (>160°C), and automatic recovery - ensures field reliability |
| Shutdown disconnect | Physically isolates VOUT from VIN during shutdown - prevents backfeed and leakage into powered-down subsystems |
Applications
| Digital Camera Sensor Supply | Handheld Medical Instrument Core Rail |
|---|---|
Use Scenario: Powers CMOS image sensor and ISP in ultra-thin digital cameras running from single Li-Ion cell. IC Role / Device Role / Timing Role: Primary 1.5V step-down regulator providing clean, low-noise bias for analog front-end and digital logic blocks. Use Value: 81% efficiency at 100mA extends battery runtime; 4mVP-P ripple avoids image noise; 1mm ThinSOT™ fits tight camera module height constraints. | Use Scenario: Supplies 1.5V core voltage to low-power microcontroller and ADC in portable ECG or glucose meter. IC Role / Device Role / Timing Role: Always-on regulated supply enabling fast wake-from-sleep response and precision analog measurement integrity. Use Value: 35µA quiescent current minimizes standby drain; shutdown disconnect prevents cross-talk between isolated measurement channels. |
| Cellular Phone Baseband IC | Low-Power DSP Supply |
Use Scenario: Delivers 1.5V to baseband processor in legacy 2G/3G feature phones with constrained PCB area. IC Role / Device Role / Timing Role: Secondary regulated rail decoupled from main PMIC, supporting burst-mode data transmission. Use Value: Burst Mode® maintains >80% efficiency across 0.1–250mA dynamic load range - avoids thermal throttling during RF transmit bursts. | Use Scenario: Powers TI C55x or ADI SHARC DSP cores in battery-operated audio analyzers and portable test equipment. IC Role / Device Role / Timing Role: High-efficiency, low-noise DC/DC converter replacing linear regulators to reduce heat in sealed enclosures. Use Value: 250mA capability supports peak DSP loads; thermal shutdown protects against sustained overloads in unventilated housings. |
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 |
|---|---|---|---|
| LTC3251 | 500mA output, spread-spectrum switching, adjustable 0.9–1.6V output, 9µA IQ | Higher current, wider VOUT adjustability, lower IQ - suited for multi-rail systems needing flexibility | Select LTC3251 when >250mA or programmable output is required; not pin-compatible |
| LTC1911-1.5 | 250mA, 1.5MHz, MS8 package, 180µA IQ, 75% efficiency at 100mA | Same output spec but higher quiescent current and lower efficiency - less suitable for long-life battery apps | Choose LTC1911-1.5 only if MS8 footprint is mandatory; inferior efficiency and IQ vs LTC3250ES6-1.5#TRPBF |
Compared with LTC3250ES6-1.5#TRPBF, LTC3251 offers higher current and lower IQ but requires external resistors for VOUT setting and lacks shutdown disconnect; LTC1911-1.5 matches pin count but trades 81% → 75% efficiency and 35µA → 180µA IQ - making LTC3250ES6-1.5#TRPBF optimal for space- and battery-limited 1.5V/250mA applications.
Availability
LTC3250ES6-1.5#TRPBF is available at Aetrix Electronics and suitable for handheld medical instruments, digital cameras, and cellular phone baseband supplies requiring stable component supply, long-term lifecycle support, and guaranteed performance across –40°C to 85°C ambient.
Supply support for LTC3250ES6-1.5#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) designs high-performance analog, mixed-signal, and power management ICs for precision, reliability, and energy efficiency in demanding applications.
The LTC3250ES6-1.5#TRPBF belongs to Linear's inductorless charge-pump DC/DC converter family, engineered specifically for ultra-low-noise, space-constrained battery-powered devices where inductor avoidance and minimal EMI are critical design requirements.
FAQ
What is the maximum continuous output current of the LTC3250ES6-1.5#TRPBF?
The LTC3250ES6-1.5#TRPBF delivers up to 250mA continuously under specified conditions (3.5V ≤ VIN ≤ 5V). It includes short-circuit protection that limits output current to approximately 500mA during fault conditions. Derating is required above 85°C ambient or with poor PCB thermal design - consult the thermal derating curve in the datasheet for safe operating area boundaries. The LTC3250ES6-1.5#TRPBF maintains regulation and protection integrity across its full –40°C to 85°C operating temperature range.
Does the LTC3250ES6-1.5#TRPBF require external inductors?
No, the LTC3250ES6-1.5#TRPBF is an inductorless charge-pump DC/DC converter. It uses two external ceramic capacitors - a 1µF flying capacitor (C+ and C– pins) and a 4.7µF output capacitor (VOUT to GND) - to achieve step-down conversion. This eliminates magnetic components, reduces EMI, and simplifies PCB layout. Polarized capacitors (e.g., tantalum or aluminum) must never be used for the flying capacitor due to voltage reversal risk. The LTC3250ES6-1.5#TRPBF relies entirely on switched-capacitor topology, not inductive energy storage.
What is the shutdown behavior of the LTC3250ES6-1.5#TRPBF?
When the SHDN pin is pulled low (<0.4V), the LTC3250ES6-1.5#TRPBF enters shutdown mode: all internal circuitry is disabled, quiescent current drops to <1µA, and the VOUT pin is physically disconnected from VIN - preventing backfeed into the input rail. The SHDN pin is a high-impedance CMOS input and must never be left floating; it requires a defined logic level. The LTC3250ES6-1.5#TRPBF resumes normal operation within ~500µs after SHDN is pulled high (>1.2V), including soft-start sequencing.
Can the LTC3250ES6-1.5#TRPBF operate from a 2.7V input?
No, the LTC3250ES6-1.5#TRPBF has a minimum input voltage of 3.1V per its absolute specifications and electrical characteristics table. While the broader LTC3250 family includes the -1.2 variant rated for 2.7V–5.5V input, the LTC3250ES6-1.5#TRPBF variant is specified only for 3.1V–5.5V operation. Attempting to operate below 3.1V may result in loss of regulation, increased ripple, or failure to start. For 2.7V input compatibility, consider the LTC3250ES6-1.2 or alternative parts like LTC3251.
How does Burst Mode® operation improve efficiency in the LTC3250ES6-1.5#TRPBF?
Burst Mode® operation in the LTC3250ES6-1.5#TRPBF activates automatically when load current falls below ~30mA, disabling the 1.5MHz oscillator and placing the device in a low-power state. This reduces quiescent current to 35µA (typ), sustaining >75% efficiency down to 1mA loads - far exceeding continuous-mode efficiency at light loads. Each "burst" delivers a controlled charge packet to maintain regulation, with fixed 12mVP-P ripple (with 4.7µF COUT). The LTC3250ES6-1.5#TRPBF thus optimizes battery life in intermittently active applications like sensor polling or wireless wake-up events.
LTC3250ES6-1.5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 250mA
- Frequency - Switching:
- 1.5MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LTC3250ES6-1.5#TRPBF FAQ
1.How can I place an order for LTC3250ES6-1.5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3250ES6-1.5#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 LTC3250ES6-1.5#TRPBF reliable?
The price and inventory of LTC3250ES6-1.5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3250ES6-1.5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3250ES6-1.5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3250ES6-1.5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3250ES6-1.5#TRPBF?
LTC3250ES6-1.5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3250ES6-1.5#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 LTC3250ES6-1.5#TRPBF?
For technical support, including LTC3250ES6-1.5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3250ES6-1.5#TRPBF requirements.
6.How does Aetrix verify that LTC3250ES6-1.5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3250ES6-1.5#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 LTC3250ES6-1.5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3250ES6-1.5#TRPBF?
All LTC3250ES6-1.5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3250ES6-1.5#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 LTC3250ES6-1.5#TRPBF part is unused and in its original packaging.
Return procedure for LTC3250ES6-1.5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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