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Analog Devices Inc. LTC1434IGN#TRPBF
- Part No.:
- LTC1434IGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1434IGN#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 450MA 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,306
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Product details
Overview
LTC1434IGN#TRPBF from Analog Devices (formerly Linear Technology) is a phase-lockable, current-mode step-down DC/DC converter delivering up to 450mA output with ±2.4% voltage accuracy, 3V–13.5V input range, and internal 0.6Ω P-channel power switches. It operates at fixed frequency up to 142kHz (COSC = 100pF), supports low-dropout 100% duty cycle, and integrates low-battery detection and power-on reset for battery-powered RF communications and portable instrumentation.
For engineers reviewing the LTC1434IGN#TRPBF datasheet, LTC1434IGN#TRPBF pinout, LTC1434IGN#TRPBF application, or LTC1434IGN#TRPBF equivalent, key selection criteria include phase-lock capability (PLLIN/PLL LPF pins), adaptive dual-MOSFET power stage (SSW/BSW), soft-start control (RUN/SS), and ±1% reference accuracy - all validated for narrow SSOP-20 industrial-grade operation.
Technical Context
The LTC1434IGN#TRPBF implements constant-frequency current-mode control with an internal 1.19V reference and error amplifier output at ITH pin (0–2.4V range). Its phase-locked loop accepts external synchronization via PLLIN (50kΩ internal termination) and adjusts oscillator frequency by ±30% through PLL LPF voltage (0–2.4V).
It features dual P-channel MOSFETs (RDS(ON) = 4.1Ω small FET, 1.2Ω big FET at 25°C) driven adaptively: only SSW activates below 260mA peak inductor current and ITH < 0.6V; both switches engage above those thresholds to maintain efficiency across load range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 13.5V - supports single-cell Li-ion to multi-cell alkaline/battery packs without pre-regulation. |
| Output Current | Up to 450mA - sufficient for RF transceivers, microcontrollers, and analog front-ends in portable systems. |
| Oscillator Frequency | 112–142kHz (COSC = 100pF) - fixed-frequency operation with ±30% PLL-adjustable range for EMI reduction. |
| Reference Accuracy | ±1% - ensures stable output regulation across temperature and line/load variations. |
| Quiescent Current | 470µA (active), 15µA (shutdown) - extends battery life in always-on or sleep-mode applications. |
| Dropout Operation | 100% duty cycle - maintains regulation down to VIN ≈ VOUT + (IL × RDS(ON)), critical for low-voltage battery end-of-life. |
| Low-Battery Detection | VTR_LBI = 1.19V ±40mV hysteresis - enables system-level brownout warning before shutdown. |
Pinout & Package
Package: 20-Lead Plastic SSOP (GN), 0.65mm pitch, JEDEC MO-153 compliant, thermal resistance θJA = 150°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SSW (Pin 2) | Drain of small P-channel MOSFET | Switches low-current loads (<260mA peak); lower RDS(ON) not required - reduces gate charge loss at light load. |
| BSW (Pin 4) | Drain of large P-channel MOSFET | Engages under high load; combined RDS(ON) ≈ 0.6Ω at VIN = 10V - sustains 450mA output with minimal conduction loss. |
| RUN/SS (Pin 7) | Soft-start timing & enable control | Internal 3µA current source charges external capacitor; 1.3V threshold enables regulation - prevents inrush and allows controlled power-up sequencing. |
| LBI (Pin 10) | Low-battery comparator input (+) | Compares against internal 1.19V reference; trip point accuracy ±40mV hysteresis - avoids chatter during battery sag. |
| PLLIN (Pin 17) | External clock input to phase detector | 50kΩ internal pull-down to SGND; accepts 0–2.4V logic-compatible sync signal - enables deterministic EMI alignment in multi-rail systems. |
| PLL LPF (Pin 16) | Phase detector output & VCO control | Drives oscillator frequency ±30% around center; RC network sets loop bandwidth - stabilizes lock and suppresses jitter. |
| VOSENSE (Pin 12) | Feedback node for error amplifier | Connects to output (fixed 3.3V/5V) or external divider (adjustable) - enables remote sensing and precise output programming. |
| POR (Pin 14) | Open-drain power-on reset output | Sinks current until VOSENSE reaches within 5% of target for 65536 cycles (~300ms at 125kHz) - provides reliable MCU reset timing. |
Key Features
| Feature | Design Value |
|---|---|
| Phase-Lockable Oscillator | PLLIN/PLL LPF interface enables synchronous switching with system clocks - eliminates beat frequencies and simplifies EMI filtering. |
| Adaptive Power Switching | Automatic selection between SSW-only and dual-FET operation based on ITH voltage and peak current - maintains >90% efficiency from 1mA to 450mA load. |
| Low-Dropout 100% Duty Cycle | Internal P-channel MOSFET remains fully enhanced as VIN approaches VOUT - sustains regulation during battery discharge down to ~3.2V for 3.3V output. |
| Integrated Low-Battery Detector | LBI/LBO pins provide accurate, hysteresis-stabilized monitoring aligned to same 1.19V reference as VOSENSE - eliminates need for external supervisor IC. |
| Power-On Reset with Counter | POR asserts low until regulated output stabilizes for 65536 oscillator cycles - delivers precise, temperature-stable reset delay independent of external RC tolerances. |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Powering baseband processor and RF transceiver from single Li-ion cell (3.0–4.2V). IC Role / Device Role / Timing Role: Primary step-down regulator delivering 3.3V/5V with phase-lock to system clock to minimize conducted EMI. Use Value: Adaptive dual-FET operation maintains >88% efficiency at 10mA standby current while supporting 450mA burst transmit peaks. | Use Scenario: Supplying 3.3V to LTE/GSM modem IC and associated analog circuitry in compact IoT gateway. IC Role / Device Role / Timing Role: Synchronous buck converter locked to host MCU clock - eliminates switching noise coupling into sensitive RF receive path. Use Value: PLLIN synchronization reduces spectral spreading; POR provides deterministic boot sequence for modem firmware initialization. |
| Portable Instruments | Distributed Power Systems |
Use Scenario: Regulating 3.3V for precision ADC, op-amps, and microcontroller in handheld multimeter. IC Role / Device Role / Timing Role: Low-noise, low-quiescent-current DC/DC converter with remote sense (VOSENSE) for stable rail under varying PCB trace impedance. Use Value: 470µA IQ and 15µA shutdown current extend battery life; ±2.4% output accuracy meets 12-bit measurement requirements. | Use Scenario: Local point-of-load conversion in telecom shelf with multiple distributed 3.3V/5V rails. IC Role / Device Role / Timing Role: Phase-locked buck converter synchronized to backplane clock - prevents subharmonic interference between adjacent converters. Use Value: PLLIN/PLL LPF interface enables coherent switching across multiple LTC1434IGN#TRPBF units - simplifies system-level EMI compliance testing. |
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 |
|---|---|---|---|
| LTC1433IGN#TRPBF | No PLLIN/PLL LPF pins; fixed-frequency only (no external sync capability); identical pinout except missing Pins 16 & 17. | Used where EMI synchronization is unnecessary; lower BOM cost when phase-lock not required. | Select LTC1434IGN#TRPBF when system-level clock coherence is mandatory; LTC1433IGN#TRPBF suffices for standalone regulation. |
| TPS62231DRYT | Higher 3MHz switching frequency; 300mA max output; no low-battery detector or POR; different package (6-pin WSON). | Targeted at space-constrained, high-frequency designs; lacks integrated supervision functions. | Choose TPS62231DRYT for ultra-compact layouts needing >1MHz operation; LTC1434IGN#TRPBF preferred when battery monitoring and reset timing are required. |
Compared with LTC1433IGN#TRPBF, the LTC1434IGN#TRPBF adds phase-lock capability at no pin-count penalty beyond two dedicated PLL pins - enabling deterministic EMI control without sacrificing industrial temperature rating or 450mA output. Against TPS62231DRYT, it trades higher frequency for integrated supervision and robust low-load efficiency via adaptive dual-FET architecture.
Availability
LTC1434IGN#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, wireless modems, and portable instruments requiring stable component supply with guaranteed industrial temperature support (–40°C to +85°C).
Supply support for LTC1434IGN#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.
The LTC1434 belongs to Linear's legacy high-efficiency, current-mode DC/DC converter family designed specifically for battery-powered RF and portable instrumentation applications demanding low noise, low IQ, and robust supervision features.
FAQ
What is the maximum supported input voltage for the LTC1434IGN#TRPBF?
The LTC1434IGN#TRPBF has an absolute maximum input voltage rating of 13.5V on PWRVIN and SVIN pins. Continuous operation is specified from 3V to 13.5V. Exceeding 13.5V risks permanent damage per Absolute Maximum Ratings table - design margin should maintain VIN ≤ 13.0V for reliability across temperature and process variation.
Does the LTC1434IGN#TRPBF support adjustable output voltage?
Yes, the LTC1434IGN#TRPBF supports adjustable output voltage via the VOSENSE and VPROG pins. Leaving VPROG open (DC) enables external resistive feedback divider connection to VOSENSE, allowing output programming from 1.19V upward using VOUT = 1.19V × (1 + R2/R1). Fixed 3.3V and 5V outputs are selected by pulling VPROG to GND or VIN respectively.
How does the phase-lock function work on the LTC1434IGN#TRPBF?
The LTC1434IGN#TRPBF uses PLLIN to accept an external clock and PLL LPF to adjust oscillator frequency ±30% around its center value. The internal phase detector compares PLLIN edge timing to COSC waveform; its output current charges/discharges the PLL LPF node, directly modulating VCO frequency. Lock is achieved when edges align within specified jitter window - confirmed by stable POR release and consistent switching period.
What is the purpose of the SSW and BSW pins on the LTC1434IGN#TRPBF?
The SSW (small switch) and BSW (big switch) pins on the LTC1434IGN#TRPBF expose the drains of two internal P-channel MOSFETs. SSW handles light loads (<260mA peak inductor current) to minimize gate charge loss; BSW engages under heavy load to reduce conduction loss. This adaptive dual-FET architecture maintains high efficiency across 1mA–450mA output range without external components.
Can the LTC1434IGN#TRPBF operate in dropout mode, and what happens to regulation?
Yes, the LTC1434IGN#TRPBF supports 100% duty-cycle dropout operation. As VIN drops near VOUT, the controller holds the P-channel MOSFETs fully enhanced, causing output to track VIN minus IOUT × RDS(ON). Regulation degrades linearly - e.g., at 450mA and RDS(ON) ≈ 0.6Ω, VOUT ≈ VIN – 0.27V. The device continues switching but transitions to linear pass behavior to sustain output until VIN falls below minimum operating threshold.
LTC1434IGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable (Programmable)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 13.5V
- Voltage - Output (Min/Fixed):
- 1.19V (3.3V, 5V)
- Voltage - Output (Max):
- 12V
- Current - Output:
- 450mA
- Frequency - Switching:
- Up to 700kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
LTC1434IGN#TRPBF FAQ
1.How can I place an order for LTC1434IGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1434IGN#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 LTC1434IGN#TRPBF reliable?
The price and inventory of LTC1434IGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1434IGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1434IGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1434IGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1434IGN#TRPBF?
LTC1434IGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1434IGN#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 LTC1434IGN#TRPBF?
For technical support, including LTC1434IGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1434IGN#TRPBF requirements.
6.How does Aetrix verify that LTC1434IGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1434IGN#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 LTC1434IGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1434IGN#TRPBF?
All LTC1434IGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1434IGN#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 LTC1434IGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC1434IGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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