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Analog Devices Inc. LTC3252EDE#TRPBF
- Part No.:
- LTC3252EDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3252EDE#TRPBF.pdf
- Description:
- IC REG CHARGE PUMP ADJ DL 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,506
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Product details
Overview
LTC3252EDE#TRPBF from Analog Devices (formerly Linear Technology) is a dual-output, inductorless switched-capacitor step-down DC/DC converter designed for space-constrained battery-powered systems. It delivers two independent, adjustable regulated outputs (0.9V–1.6V, up to 250mA each) from a single 2.7V–5.5V input, achieves typical efficiency 50% higher than LDOs, employs constant-frequency spread-spectrum switching to minimize EMI, and operates with only ceramic capacitors-no inductors required. It is used in handheld electronics requiring low-noise, dual-rail logic supplies.
For engineers reviewing the LTC3252EDE#TRPBF datasheet, LTC3252EDE#TRPBF pinout, LTC3252EDE#TRPBF application, or LTC3252EDE#TRPBF equivalent, key selection criteria include dual independent enable control (EN1/EN2), ultra-low quiescent current (60µA with both outputs active), 12-pin 4mm × 3mm DFN package with exposed ground pad, spread-spectrum noise reduction, and 0.8V feedback reference enabling precise output programming via resistor dividers.
Technical Context
The LTC3252EDE#TRPBF integrates two independent 2-phase, nonoverlapping switched-capacitor charge pumps operating 180° out of phase to reduce input ripple and improve efficiency. Each pump regulates its output using a voltage-controlled current source modulated by an error amplifier sensing the FB1/FB2 pins against a precise 0.8V internal reference.
Its spread-spectrum oscillator randomly varies switching frequency between 0.8MHz and 2.0MHz (typical 1.0–1.6MHz), significantly reducing peak EMI harmonics. Burst Mode® operation activates below ~30mA total load, disabling the oscillator to achieve ultralow 35µA (one output) or 0.01µA shutdown current while maintaining regulated outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-ion (3.0–4.2V) and 3-cell NiMH (3.6–4.5V) without external regulation. |
| Output Voltage Range | 0.9V to 1.6V per channel - programmable via external resistor dividers referenced to 0.8V FB pin. |
| Max Output Current | 250mA per output - sufficient for powering dual-core DSPs, low-voltage logic, or memory I/O rails. |
| Quiescent Current | 60µA (both outputs enabled) - enables >1-year battery life in always-on sensor nodes with dual supply rails. |
| Shutdown Current | 0.01µA typical - ensures negligible drain during system sleep modes. |
| Switching Frequency | 0.8–2.0MHz spread spectrum - reduces EMI peak amplitude by distributing energy across bandwidth, easing EMC compliance. |
| Output Ripple | 10mVP-P at 250mA - meets tight noise requirements for RF-sensitive analog circuits and high-speed digital interfaces. |
Pinout & Package
The LTC3252EDE#TRPBF is housed in a thermally enhanced 12-pin 4mm × 3mm plastic DFN package with exposed ground pad (must be soldered to PCB ground plane). Pin numbering follows standard top-view orientation with notch indicator.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB1 | Feedback Input 1 | Senses OUT1 voltage via external resistor divider; regulates OUT1 to 0.8V × (1 + RA/RB). |
| 2 EN1 | Enable Input 1 | CMOS-compatible logic input (VIH ≈ 1.2V, VIL ≈ 0.4V); high = enable OUT1, low = disconnect OUT1 from VIN. |
| 3 VIN | Main Input Supply | 2.7–5.5V input; requires ≥4.7µF low-ESR ceramic bypass capacitor to GND for stability and noise suppression. |
| 4 C1+ | Flying Capacitor 1 Positive | Connects to positive terminal of C1 (≥1µF ceramic); forms charge transfer path for OUT1 pump. |
| 5 OUT1 | Regulated Output 1 | Delivers up to 250mA; disconnected from VIN during shutdown; requires ≥4.7µF low-ESR ceramic output capacitor. |
| 6 C1− | Flying Capacitor 1 Negative | Connects to negative terminal of C1; completes flying capacitor loop for OUT1 charge pump. |
| 7 GND | Ground Reference | Primary signal and power return; exposed pad must be soldered to solid ground plane for thermal and EMI performance. |
| 8 C2− | Flying Capacitor 2 Negative | Connects to negative terminal of C2 (≥1µF ceramic); completes flying capacitor loop for OUT2 pump. |
| 9 OUT2 | Regulated Output 2 | Delivers up to 250mA; independently controllable via EN2; same capacitor requirements as OUT1. |
| 10 C2+ | Flying Capacitor 2 Positive | Connects to positive terminal of C2; forms charge transfer path for OUT2 pump. |
| 11 EN2 | Enable Input 2 | CMOS-compatible logic input; high = enable OUT2, low = disconnect OUT2 from VIN; allows independent rail sequencing. |
| 12 FB2 | Feedback Input 2 | Senses OUT2 voltage; identical function to FB1 but for second output channel. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent regulated outputs | Each output (OUT1/OUT2) has dedicated enable (EN1/EN2) and feedback (FB1/FB2) pins, enabling flexible power sequencing and rail isolation. |
| Inductorless architecture | Uses only ceramic flying and output capacitors - eliminates magnetic components, saves board area, avoids inductor saturation and EMI coupling. |
| Spread-spectrum switching | Randomizes switching frequency between 0.8–2.0MHz to reduce peak conducted and radiated EMI by >10dB compared to fixed-frequency regulators. |
| Burst Mode® operation | Automatically enters low-power state below ~30mA load, reducing quiescent current to 35µA (one output) or 0.01µA (shutdown) without sacrificing regulation accuracy. |
| Soft-start and protection | Internal soft-start limits inrush current; short-circuit current limiting (~500mA per output) and thermal shutdown (>160°C) prevent damage during fault conditions. |
Applications
| Handheld Electronic Devices | Cellular Phones |
|---|---|
Use Scenario: Powering dual-core application processors and baseband ICs in compact smartphones with single-cell Li-ion battery. IC Role / Device Role / Timing Role: Dual-rail DC/DC converter generating independent 1.2V core and 1.5V I/O supplies from 3.0–4.2V battery. Use Value: Eliminates need for two separate LDOs or inductor-based buck converters, reducing solution size by >40% and improving efficiency by 50% over linear regulation. |
Use Scenario: Providing regulated low-noise supplies for RF transceivers and audio codecs in feature phones. IC Role / Device Role / Timing Role: Low-EMI dual-output regulator delivering 1.5V for PA bias and 1.2V for digital baseband, synchronized via shared VIN and ground. Use Value: Spread-spectrum operation suppresses switching noise near cellular bands (800/900/1800/1900 MHz), preventing receiver desensitization without added shielding. |
| Low Voltage Logic Supplies | DSP Power Supplies |
Use Scenario: Generating clean 0.9V–1.6V rails for FPGA I/O banks and microcontroller peripherals in portable instrumentation. IC Role / Device Role / Timing Role: Adjustable dual-output converter supporting mixed-voltage logic families (e.g., 1.2V core, 1.5V DDR interface) from a common battery source. Use Value: Independent EN1/EN2 pins allow dynamic rail enable/disable during low-power states, reducing system standby current to sub-µA levels. |
Use Scenario: Powering fixed-point or floating-point DSPs in battery-operated medical imaging or audio processing units. IC Role / Device Role / Timing Role: High-efficiency dual-rail supply delivering 250mA at 1.2V (core) and 1.5V (memory interface) with <10mVP-P ripple. Use Value: Low output impedance (0.15Ω at 1.5V) ensures <38mV load transient deviation at full 250mA step, preserving DSP timing margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output inductorless DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3251EMS#TRPBF | Single-output, 500mA capability; lower quiescent current (8µA); same 0.9–1.6V range and spread-spectrum operation. | Not suitable for dual-rail systems requiring independent enable/control; better for higher-current single-rail applications. | Select LTC3251 when only one regulated rail is needed and >250mA output current is required. |
| LTC3250EDD#TRPBF | Fixed 1.5V output (non-adjustable); smaller ThinSOT-6 package; 35µA quiescent current; no EN2/FB2 pins. | Lacks dual output flexibility and voltage adjustability; optimized for cost-sensitive, single-rail designs. | Choose LTC3250 for simple 1.5V point-of-load conversion where board space and BOM count are critical constraints. |
Compared with LTC3251 and LTC3250, the LTC3252EDE#TRPBF uniquely provides two independently adjustable, enable-controlled outputs in a compact DFN-making it the only option among these three for systems requiring true dual-rail programmability without inductors.
Availability
LTC3252EDE#TRPBF is available at Aetrix Electronics and suitable for handheld electronics, cellular phone power management, and low-voltage logic supplies requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC3252EDE#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3252 belongs to Linear Technology's precision switched-capacitor DC/DC converter product line, engineered specifically for battery-powered portable devices needing ultra-low noise, high efficiency, and minimal external components-replacing traditional LDOs and inductor-based solutions.
FAQ
What is the minimum input voltage required for the LTC3252EDE#TRPBF to regulate at 1.5V output?
The minimum input voltage depends on load current and output impedance. For 1.5V output at 250mA, the datasheet specifies VIN(MIN) > 2 × (VOUT + ROL × IOUT), where ROL = 1.4Ω max. Substituting values gives VIN(MIN) > 2 × (1.5V + 1.4Ω × 0.25A) = 3.7V. Thus, LTC3252EDE#TRPBF requires ≥3.7V input to sustain 1.5V/250mA regulation - confirming suitability for 3-cell NiMH but marginal for fully depleted single-cell Li-ion.
Can the LTC3252EDE#TRPBF generate 1.8V output?
No. The LTC3252EDE#TRPBF's internal architecture and feedback reference (0.8V) limit the programmable output range to 0.9V–1.6V. Attempting to set 1.8V would violate the 2:1 charge-pump constraint (VOUT ≤ VIN/2) and exceed the maximum FB divider ratio supported by the error amplifier. For 1.8V output, consider alternatives like LTC1911-1.8 or LTC3405A.
How does the spread-spectrum feature of the LTC3252EDE#TRPBF reduce EMI?
The LTC3252EDE#TRPBF's oscillator randomly varies switching frequency between 0.8MHz and 2.0MHz, spreading spectral energy across a wide band instead of concentrating it at discrete harmonics. This reduces peak EMI amplitude by 10–15dB compared to fixed-frequency regulators, easing compliance with FCC Class B and CISPR-22 radiated emissions limits - especially critical near sensitive RF receivers in cellular handsets.
What is the purpose of the exposed pad on the LTC3252EDE#TRPBF package?
The exposed pad on the LTC3252EDE#TRPBF is electrically and thermally connected to GND. It must be soldered to a PCB ground plane to achieve θJA = 40°C/W thermal resistance and ensure reliable operation at full load. Omitting this connection raises junction temperature by >30°C under 250mA load, risking thermal shutdown and long-term reliability degradation - making proper pad soldering mandatory, not optional.
Does the LTC3252EDE#TRPBF support independent sequencing of its two outputs?
Yes. The LTC3252EDE#TRPBF provides separate EN1 and EN2 pins, allowing independent control of OUT1 and OUT2. Driving EN1 high before EN2 enables precise power-up sequencing (e.g., core rail before I/O rail), while asserting EN1 low while holding EN2 high maintains OUT2 active during OUT1 shutdown - essential for low-power modes in processors and FPGAs.
LTC3252EDE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.9V
- Voltage - Output (Max):
- 1.6V
- Current - Output:
- 250mA
- Frequency - Switching:
- 1MHz ~ 1.6MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (4x3)
LTC3252EDE#TRPBF FAQ
1.How can I place an order for LTC3252EDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3252EDE#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 LTC3252EDE#TRPBF reliable?
The price and inventory of LTC3252EDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3252EDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3252EDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3252EDE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3252EDE#TRPBF?
LTC3252EDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3252EDE#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 LTC3252EDE#TRPBF?
For technical support, including LTC3252EDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3252EDE#TRPBF requirements.
6.How does Aetrix verify that LTC3252EDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3252EDE#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 LTC3252EDE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3252EDE#TRPBF?
All LTC3252EDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3252EDE#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 LTC3252EDE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3252EDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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