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Analog Devices Inc. LTC1434CGN#TRPBF
- Part No.:
- LTC1434CGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1434CGN#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 450MA 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,810
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Product details
Overview
LTC1434CGN#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 and 93% peak efficiency. It integrates dual P-channel MOSFETs (RDS(ON) = 0.6Ω combined at 10V), operates from 3V–13.5V input, and supports fixed 3.3V/5V or adjustable output via VPROG pin - ideal for battery-powered RF modems and portable instrumentation.
For engineers reviewing the LTC1434CGN#TRPBF datasheet, LTC1434CGN#TRPBF pinout, LTC1434CGN#TRPBF application, or LTC1434CGN#TRPBF equivalent, key selection criteria include its phase-locked loop (PLLIN/PLL LPF pins), low-quiescent-current operation (470µA active, 15µA shutdown), dropout capability (100% duty cycle), internal low-battery detector (LBI/LBO), and 16-pin narrow SSOP package with validated thermal resistance (θJA = 150°C/W).
Technical Context
The LTC1434CGN#TRPBF implements constant-frequency current-mode control with adaptive power switching: it dynamically engages either the small (3.3Ω RDS(ON)) or large (0.8Ω RDS(ON)) internal P-MOSFET based on load current and ITH voltage, enabling high efficiency across 1mA–450mA. Its PLL architecture accepts external synchronization via PLLIN (50kΩ internal termination) and adjusts oscillator frequency via PLL LPF (0–2.4V control range), supporting noise-sensitive multi-rail systems.
It features integrated protection functions including overvoltage lockout (1.24–1.32V threshold), short-circuit frequency foldback (~22kHz under fault), and power-on reset with 65536-cycle delay (≈300ms at 125kHz). The device maintains regulation down to 3V input and supports true dropout operation by sustaining 100% duty cycle when VIN approaches VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 13.5V - supports single-cell Li-ion (3.0–4.2V) and multi-cell alkaline/NiMH inputs without external regulators. |
| Output Current | Up to 450mA - sufficient for powering baseband processors, RF transceivers, or sensor signal chains in portable equipment. |
| Efficiency | Up to 93% - achieved via adaptive dual-MOSFET switching and low RDS(ON), reducing thermal load in compact enclosures. |
| Quiescent Current | 470µA (active), 15µA (shutdown) - extends battery life in always-on monitoring or sleep-wake applications. |
| Oscillator Frequency | 112–142kHz (COSC = 100pF) - fixed-frequency operation simplifies EMI filtering; PLL enables synchronized switching in multi-converter systems. |
| Reference Accuracy | ±1% (1.19V internal reference) - ensures stable output voltage across temperature and line/load variations. |
| Package | 16-lead narrow SSOP (GN) - surface-mount footprint compatible with automated assembly; θJA = 150°C/W enables operation up to 70°C ambient. |
Pinout & Package
Package: 16-lead narrow plastic SSOP (GN), 0.15mm lead pitch, JEDEC MO-153 compliant. Thermal pad not present; PGND and SGND must be routed separately to minimize noise coupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SSW (Pin 1) | Drain of small P-MOSFET | Switches low-current loads (<260mA peak); used with smaller inductor in dual-inductor configurations for improved light-load efficiency. |
| BSW (Pin 3) | Drain of large P-MOSFET | Engaged above 260mA peak inductor current; handles full 450mA output with lower conduction loss. |
| SGND (Pin 5) | Small-signal ground | Must be isolated from power ground (PGND) and connected directly to COUT (–) to prevent feedback loop instability. |
| RUN/SS (Pin 6) | Soft-start and enable control | Capacitor-to-ground sets ramp time (~0.5s/µF); <1.3V forces shutdown while preserving LBI comparator function. |
| LBI (Pin 8) | Low-battery comparator input | Compares against 1.19V reference; trip point = 1.16–1.22V with 40mV hysteresis - configurable for system-level brownout detection. |
| VPROG (Pin 9) | Output voltage programming | Selects 3.3V (0V), 5V (VIN), or adjustable mode (open); determines VOSENSE connection point in feedback network. |
| VOSENSE (Pin 10) | Feedback voltage input | Receives output voltage or divider node; error amplifier compares to 1.19V reference to regulate output within ±2.4%. |
| ITH (Pin 11) | Error amplifier compensation | Controls peak current threshold; voltage range 0–2.4V - external RC network stabilizes loop response. |
| POR (Pin 12) | Power-on reset open-drain output | Pulls low when VOUT is >7.5% out of regulation; releases after 65536 oscillator cycles once VOUT reaches –5% of target. |
| COSC (Pin 13) | Oscillator timing capacitor | External capacitor (e.g., 100pF) sets base frequency; PLL LPF voltage shifts frequency ±30% around center value. |
| PLL LPF (Pin 16) | Phase detector output / VCO control | Drives oscillator frequency; 0–2.4V range corresponds to –30% to +30% frequency deviation - critical for EMI reduction in synchronized systems. |
Key Features
| Feature | Design Value |
|---|---|
| Phase-Lockable Oscillator | Enables synchronous switching with external clock (PLLIN) to eliminate beat frequencies and simplify EMI compliance in multi-rail designs. |
| Adaptive Dual-Power Switching | Automatically selects between small (3.3Ω) and large (0.8Ω) P-MOSFETs based on load, maintaining >85% efficiency from 1mA to 450mA. |
| Low-Battery Detection with Hysteresis | 1.19V reference-based comparator (LBI/LBO) with 40mV hysteresis prevents chatter during battery sag; LBO sinks current to drive external logic. |
| 100% Duty-Cycle Dropout Operation | Continues regulation as VIN drops to VOUT by holding P-MOSFETs fully on - essential for deep-discharge battery applications. |
| Integrated Power-On Reset Timer | Generates clean system reset after 65536 oscillator cycles (≈300ms at 125kHz) once output reaches –5% of regulation - eliminates need for external POR IC. |
Applications
| Cellular Baseband Power | Portable Instrumentation |
|---|---|
Use Scenario: Powers ARM Cortex-M microcontroller and ADC/DAC subsystems in handheld multimeters and data loggers operating from 2×AA batteries (2.4–3.2V). IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 3.3V rail; uses RUN/SS for controlled wake-up and POR for MCU reset coordination. Use Value: 470µA quiescent current extends battery life beyond 12 months in sleep mode; dropout operation sustains regulation until battery reaches 2.7V. |
Use Scenario: Supplies 5V to analog front-end circuitry (op-amps, sensors) in portable gas analyzers powered by rechargeable LiPo cells. IC Role / Device Role / Timing Role: Fixed-output 5V converter configured via VPROG = VIN; leverages LBI to trigger low-power alert before battery depletion. Use Value: ±2.4% output accuracy ensures sensor excitation stability; low-noise current-mode control minimizes measurement drift. |
| Wireless Modem RF Bias | Distributed Power Systems |
Use Scenario: Generates clean 3.3V bias for LTE/5G RF power amplifiers in mobile hotspots, where switching noise must avoid interfering with adjacent receive bands. IC Role / Device Role / Timing Role: Phase-locked regulator synchronized to system clock via PLLIN to shift switching harmonics away from sensitive RF bands. Use Value: PLL-enabled frequency agility reduces conducted EMI by >15dB at critical 2.4GHz/5GHz ISM bands - verified in typical application layout. |
Use Scenario: Provides local 3.3V supply in industrial IoT gateways with multiple isolated DC/DC stages, requiring coordinated startup sequencing. IC Role / Device Role / Timing Role: Secondary regulator enabled only after primary 12V rail stabilizes; uses POR output to gate downstream enable signals. Use Value: Integrated POR eliminates discrete supervisor IC; 65536-cycle delay ensures reliable sequencing even with variable oscillator frequency. |
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 |
|---|---|---|---|
| LT3502AEDD#TRPBF | Higher 500mA output, 3MHz switching, no PLL support, requires external MOSFETs | Better for space-constrained designs needing higher frequency; unsuitable where clock synchronization is required | Choose LT3502AEDD#TRPBF if board area is critical and EMI can be managed with higher-frequency filtering. |
| TPS62231DRYR | 300mA output, 3.5MHz fixed-frequency, no LBI/POR, DSBGA package | Optimized for ultra-small footprint; lacks battery monitoring and system reset functions | Choose TPS62231DRYR only for cost-sensitive, size-limited consumer devices without battery management requirements. |
Compared with LT3502AEDD#TRPBF and TPS62231DRYR, the LTC1434CGN#TRPBF uniquely combines phase-lock capability, integrated dual-MOSFETs, low-battery detection, and power-on reset in a single 16-pin SSOP - making it the only option for battery-powered RF systems requiring synchronized, self-contained power management.
Availability
LTC1434CGN#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, portable instruments, and wireless modems requiring stable component supply with long-term manufacturability and consistent parametric performance.
Supply support for LTC1434CGN#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, communications, and industrial markets.
The LTC1434CGN#TRPBF belongs to Linear's legacy high-efficiency DC/DC converter family, designed specifically for battery-powered RF and portable systems demanding low noise, adaptive efficiency, and integrated system supervision functions.
FAQ
What is the maximum output current capability of the LTC1434CGN#TRPBF?
The LTC1434CGN#TRPBF delivers up to 450mA of continuous output current under typical conditions (TA = 25°C, VIN = 10V). Maximum output depends on input voltage, ambient temperature, PCB layout, and thermal management - at 3.6V input and 70°C ambient, derated output is approximately 320mA per the datasheet's "Maximum Output Current vs Input Supply" graph.
Does the LTC1434CGN#TRPBF support external frequency synchronization?
Yes, the LTC1434CGN#TRPBF supports external frequency synchronization via its dedicated PLLIN and PLL LPF pins. When an external clock is applied to PLLIN, the internal phase-locked loop locks the oscillator to that frequency, allowing precise timing alignment across multiple converters to reduce beat frequencies and simplify EMI filtering - a feature absent in the pin-compatible LTC1433 variant.
How does the adaptive power switching work in the LTC1434CGN#TRPBF?
The LTC1434CGN#TRPBF uses adaptive power switching by monitoring the ITH pin voltage and inductor peak current. When both remain below thresholds (ITH < 0.6V and peak current < 260mA), only the small P-MOSFET (SSW) operates; exceeding either condition engages the large P-MOSFET (BSW) for higher efficiency at medium-to-heavy loads - this dual-switch architecture maintains >85% efficiency from 1mA to 450mA.
What is the purpose of the LBI and LBO pins on the LTC1434CGN#TRPBF?
The LBI (Low-Battery Input) pin connects to a resistive divider from the battery to compare against the internal 1.19V reference; the LBO (Low-Battery Output) pin is an open-drain output that pulls low when LBI falls below 1.19V (trip range 1.16–1.22V). This provides system-level battery monitoring with 40mV hysteresis to prevent oscillation during voltage sag - enabling graceful shutdown or user alerts in battery-powered equipment.
Can the LTC1434CGN#TRPBF operate in dropout mode, and what happens to regulation?
Yes, the LTC1434CGN#TRPBF supports 100% duty-cycle dropout operation. As input voltage decreases toward the output voltage, the controller holds the P-MOSFETs continuously on, causing VOUT to track VIN minus the RDS(ON) drop across the conducting FETs. Regulation is maintained until VIN falls below the minimum required headroom - typically ~200mV above VOUT at 450mA - ensuring uninterrupted operation during deep battery discharge.
LTC1434CGN#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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
LTC1434CGN#TRPBF FAQ
1.How can I place an order for LTC1434CGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1434CGN#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 LTC1434CGN#TRPBF reliable?
The price and inventory of LTC1434CGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1434CGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1434CGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1434CGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1434CGN#TRPBF?
LTC1434CGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1434CGN#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 LTC1434CGN#TRPBF?
For technical support, including LTC1434CGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1434CGN#TRPBF requirements.
6.How does Aetrix verify that LTC1434CGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1434CGN#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 LTC1434CGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1434CGN#TRPBF?
All LTC1434CGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1434CGN#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 LTC1434CGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC1434CGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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