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Analog Devices Inc. LTC3423EMS#TRPBF
- Part No.:
- LTC3423EMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC3423EMS#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 1A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,586
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Product details
Overview
LTC3423EMS#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, fixed-frequency, synchronous step-up DC/DC converter optimized for single-cell battery inputs (0.5V–1.5V) delivering regulated output voltages from 1.5V to 5.5V. It integrates a 0.16Ω N-channel MOSFET switch and 0.21Ω P-channel synchronous rectifier, supports up to 1A switch current, operates at frequencies up to 3MHz via external timing resistor, and achieves 95% efficiency in portable instrumentation and wireless handsets.
For engineers reviewing the LTC3423EMS#TRPBF datasheet, LTC3423EMS#TRPBF pinout, LTC3423EMS#TRPBF application, or LTC3423EMS#TRPBF equivalent, key selection criteria include its Burst Mode® operation (38µA quiescent current), VDD-powered control circuitry (2.7V–5.5V), MSOP-10 package, 1.25V feedback reference, and absence of power-good functionality compared to LTC3401/LTC3402.
Technical Context
The LTC3423EMS#TRPBF employs current-mode control with adaptive slope compensation, enabling stable loop response without complex external compensation. Its internal architecture includes lossless peak-current sensing, a transconductance error amplifier (85 µmhos), and programmable oscillator synchronization via the MODE/SYNC pin.
It features user-controllable Burst Mode® operation (enabled by driving MODE/SYNC high), fixed-frequency PWM mode (MODE/SYNC low), and external clock synchronization (MODE/SYNC as input). The IC requires VDD ≥2.7V to power internal circuitry independently of VIN, and incorporates thermal shutdown, current limit, and <1µA shutdown current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Operating Range | 0.5V to 5.5V - supports startup from single NiMH/alkaline cell (≥0.9V typical) and operation down to 0.5V under load. |
| VDD Supply Range | 2.7V to 5.5V - powers internal logic and gate drivers; must be supplied separately (e.g., from LDO or higher-voltage rail). |
| Output Voltage Range | 1.5V to 5.5V - set via external resistor divider on FB pin; 1.25V nominal feedback reference voltage. |
| Switch Current Limit | 1A (typical), 1.6A (max) - defines maximum inductor peak current; enables 600mA output at 1.8V from 1.2V input. |
| Quiescent Current | 38µA in Burst Mode® - extends battery life in low-power standby; rises to 440µA in fixed-frequency active mode. |
| Switching Frequency | Up to 3MHz - set externally via Rt resistor; allows ultra-small inductors (e.g., 2.2µH) and ceramic output capacitors. |
| Efficiency | Up to 95% - achieved via synchronous rectification; eliminates need for external Schottky diode. |
Pinout & Package
Package: 10-lead MSOP (3mm × 3mm, 0.5mm pitch), exposed pad not electrically connected. RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Rt | Oscillator Timing Input | Connects to ground via resistor to set switching frequency (f = 3×10¹⁰/Rt Hz); enables precise frequency programming and synchronization. |
| MODE/SYNC | Mode Control / Clock Input | High = Burst Mode® enabled; Low = fixed-frequency PWM; External clock = oscillator sync (pulse width 100ns–2µs). |
| VIN | Input Power Sense | Senses input voltage for regulation; does not supply power-IC relies on VDD for bias; supports inputs as low as 0.5V after startup. |
| SW | Power Switch Node | Connects to inductor and optional Schottky diode; carries high dI/dt; requires short, low-inductance PCB trace. |
| GND | Signal & Power Ground | Common return for analog and power circuits; must be low-impedance plane tied to VDD and VOUT capacitor grounds. |
| VDD | Internal Circuit Power | Supplies bias for control logic, gate drivers, and error amp; requires 2.2µF ceramic bypass capacitor placed adjacent to pin. |
| VOUT | Synchronous Rectifier Output | Delivers regulated output; body diode of internal PMOS provides hold-up during shutdown (VOUT ≈ VIN − 0.3V). |
| FB | Feedback Input | Resistor divider tap point; compares output to 1.25V internal reference; high-impedance input (≤50nA leakage). |
| VC | Error Amplifier Output | Connects to compensation network (RZ, CZ); transconductance = 85 µmhos; used for OPTI-LOOP® compensation. |
| SHDN | Shutdown Control | Active-low enable; grounding shuts down IC; draws <1µA; tie to VDD or logic high (>1V) to operate. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Reduces quiescent current to 38µA at light loads while maintaining regulation; eliminates low-frequency ripple artifacts common in pulse-skipping converters. |
| Synchronous Rectification | Integrated 0.21Ω P-channel MOSFET replaces external Schottky diode, eliminating forward drop loss and improving efficiency by up to 8% at 300mA. |
| VDD-Powered Architecture | Decouples control circuitry from VIN, enabling reliable startup and regulation even when VIN drops below 1.0V post-startup (e.g., deep-discharge alkaline cells). |
| OPTI-LOOP® Compensation | Enables stable loop response with minimal external components using VC pin compensation; supports wide output capacitance range (10µF–44µF) and ESR variation. |
| Programmable & Synchronizable Oscillator | Frequency set from 100kHz to 3MHz via single Rt resistor; external clock sync avoids EMI interference in RF-sensitive applications (e.g., GPS receivers). |
Applications
| Pagers | Handheld Instruments |
|---|---|
Use Scenario: Battery-powered alphanumeric pager requiring stable 1.8V rail from single AA/AAA cell. IC Role / Device Role / Timing Role: Primary step-up regulator generating clean, low-noise 1.8V supply for baseband processor and display driver. Use Value: Burst Mode® extends battery life >2× vs fixed-frequency operation; MSOP-10 footprint minimizes board area in space-constrained clamshell design. | Use Scenario: Portable multimeter with LCD, microcontroller, and analog front-end powered by two series alkaline cells (3V total). IC Role / Device Role / Timing Role: Generates isolated 5.0V rail for op-amp bias and ADC reference from partially discharged 2.2V input. Use Value: 95% efficiency maintains runtime despite varying input (2.2V–3.0V); VDD independence ensures regulation stability during battery sag. |
| Cordless Phones | GPS Receivers |
Use Scenario: DECT cordless phone handset needing 3.3V for RF transceiver and 1.8V for baseband ASIC from single Li-ion cell (2.8V–4.2V). IC Role / Device Role / Timing Role: Dual-output configuration (using external resistive divider and feed-forward) supplies both rails with tight cross-regulation. Use Value: 3MHz switching avoids IF band interference (455kHz/1.1MHz); low EMI due to synchronous rectification meets FCC Class B limits. | Use Scenario: Miniature GPS module in asset tracker operating from coin-cell (1.2V) with 3.3V requirement for GNSS SoC. IC Role / Device Role / Timing Role: Ultra-low-quiescent boost converter delivering 3.3V at ≤50mA continuous, supporting cold-start acquisition. Use Value: 38µA Burst Mode® current enables >1-year shelf life; 0.5V minimum VIN allows operation until battery reaches end-of-life voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3401EMS#TRPBF | Includes PGOOD pin; no VDD pin (self-powered from VIN); 1A switch; same MSOP-10 package. | Requires VIN ≥0.5V only-no separate VDD rail needed; better suited for simpler single-rail systems where power-good signaling is required. | Select LTC3401EMS#TRPBF if system lacks a dedicated VDD source and needs PGOOD monitoring; not drop-in due to pinout and bias architecture differences. |
| LTC3424EMS#TRPBF | Higher 2A switch current; identical pinout, package, and feature set except current rating and thermal limits. | Supports higher output power (≤1.5W vs ≤0.75W); suitable for 5V@300mA or 3.3V@450mA loads where LTC3423EMS#TRPBF would thermally throttle. | Select LTC3424EMS#TRPBF when output current exceeds 600mA at 1.8V or 450mA at 3.3V; shares layout but requires thermal validation. |
Compared with LTC3401EMS#TRPBF, LTC3423EMS#TRPBF trades PGOOD and VIN self-powering for VDD-controlled flexibility and lower noise in Burst Mode®; versus LTC3424EMS#TRPBF, it offers lower thermal stress and cost for sub-600mA applications without sacrificing footprint or control features.
Availability
LTC3423EMS#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, wireless handsets, and battery backup systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3423EMS#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 precision, industrial, automotive, and communications markets.
The LTC3423EMS#TRPBF belongs to Linear's micropower synchronous boost converter family, designed specifically for ultra-low-input-voltage, battery-critical applications where efficiency at light loads and small solution size are paramount.
FAQ
What is the minimum input voltage required for LTC3423EMS#TRPBF to start up and regulate?
LTC3423EMS#TRPBF requires VDD ≥2.7V to power internal circuitry before startup; once running, VIN can be as low as 0.5V. However, practical startup from a single-cell battery typically requires VIN ≥0.9V (e.g., fresh alkaline) to ensure sufficient headroom for the internal charge pump and gate drive. The IC will not initiate switching until VDD exceeds 2.7V, regardless of VIN level.
Can LTC3423EMS#TRPBF operate without an external VDD supply?
No. LTC3423EMS#TRPBF requires a dedicated VDD supply between 2.7V and 5.5V to power its internal control circuitry, gate drivers, and error amplifier. Unlike LTC3401/LTC3402, it cannot derive bias from VIN. If no separate VDD rail exists, a low-dropout regulator or charge pump fed from VIN must be used to generate VDD.
What is the purpose of the MODE/SYNC pin on LTC3423EMS#TRPBF, and how should it be configured?
The MODE/SYNC pin on LTC3423EMS#TRPBF serves three functions: driving it high enables Burst Mode® (38µA IQ), pulling it low forces fixed-frequency PWM operation, and applying an external clock (100ns–2µs pulse width) synchronizes the internal oscillator. For most battery-powered applications, connect to VDD via 100kΩ resistor to enable Burst Mode® after startup; avoid driving it during initial power-on until regulation is established.
Does LTC3423EMS#TRPBF require an external Schottky diode for proper operation?
No. LTC3423EMS#TRPBF integrates a 0.21Ω P-channel MOSFET as a synchronous rectifier, eliminating the need for an external Schottky diode. Adding one (e.g., MBRM120T3) may marginally improve peak efficiency at high frequencies by reducing transition losses, but it is not required for basic functionality, regulation, or reliability.
How is the switching frequency programmed on LTC3423EMS#TRPBF?
Switching frequency on LTC3423EMS#TRPBF is set by connecting an external resistor (Rt) between the Rt pin (Pin 1) and ground. The relationship is fOSC ≈ 3×10¹⁰ / Rt Hz - e.g., 30.1kΩ yields ~1MHz. The resistor value must be selected considering tolerance, temperature drift, and PCB layout parasitics; values from 10kΩ (3MHz) to 300kΩ (100kHz) are supported.
LTC3423EMS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 1A (Switch)
- Frequency - Switching:
- Up to 3MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LTC3423EMS#TRPBF FAQ
1.How can I place an order for LTC3423EMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3423EMS#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 LTC3423EMS#TRPBF reliable?
The price and inventory of LTC3423EMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3423EMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3423EMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3423EMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3423EMS#TRPBF?
LTC3423EMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3423EMS#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 LTC3423EMS#TRPBF?
For technical support, including LTC3423EMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3423EMS#TRPBF requirements.
6.How does Aetrix verify that LTC3423EMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3423EMS#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 LTC3423EMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3423EMS#TRPBF?
All LTC3423EMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3423EMS#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 LTC3423EMS#TRPBF part is unused and in its original packaging.
Return procedure for LTC3423EMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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