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Analog Devices Inc. LTC1434CGN#PBF
- Part No.:
- LTC1434CGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1434CGN#PBF.pdf
- Description:
- IC REG BUCK ADJ 450MA 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,016
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Product details
Overview
LTC1434CGN#PBF 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 portable RF and battery-powered systems.
For engineers reviewing the LTC1434CGN#PBF datasheet, LTC1434CGN#PBF pinout, LTC1434CGN#PBF application, or LTC1434CGN#PBF equivalent, key selection considerations include its 20-lead SSOP package, PLL synchronization capability (LTC1434-specific), Adaptive Power™ dual-FET switching architecture, ±1% reference accuracy, and shutdown current of only 15µA - critical for cellular telephones, wireless modems, and distributed power systems.
Technical Context
The LTC1434CGN#PBF implements constant-frequency current-mode control with an internal error amplifier (GM), peak-current comparator (ICOMP), and RS latch FF3 driving two P-channel MOSFETs. Its Adaptive Power™ stage selectively activates either the small-FET (RDS(ON) = 4.1Ω typ) or both FETs (big-FET RDS(ON) = 1.2Ω typ) based on inductor peak current (<260mA) and ITH voltage (<0.6V), optimizing efficiency across load ranges.
Unlike the LTC1433, the LTC1434CGN#PBF includes full PLL functionality: PLLIN accepts external sync signals (50kΩ internal termination), PLL LPF serves as both phase detector output and oscillator control input (0–2.4V range), enabling frequency alignment to system clocks - essential for noise-sensitive RF communications and synchronized multi-rail power domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 13.5V - supports single-cell Li-ion (3.0–4.2V), dual-cell NiMH (2.4–3.0V), and wide-input industrial rails without external regulators. |
| Output Current | Up to 450mA - sufficient for powering baseband processors, RF transceivers, and analog front-ends in portable instruments. |
| Reference Accuracy | ±1% - ensures stable 3.3V/5V or adjustable output regulation under line/load/temperature variation. |
| Oscillator Frequency | 112–142kHz (COSC = 100pF) - fixed-frequency operation simplifies EMI filtering; PLL extends range ±30% for synchronized noise reduction. |
| Quiescent Current | 470µA (active), 15µA (shutdown) - extends battery life in always-on monitoring and low-duty-cycle wireless modems. |
| Low-Battery Detection | VTRLBI = 1.19V ±20mV - matches reference accuracy to enable precise battery end-of-life signaling without calibration. |
| Power-On Reset Delay | 65536 oscillator cycles (~300ms at 125kHz) - provides deterministic system initialization timing after VOUT reaches regulation. |
Pinout & Package
Package: 20-lead narrow-body plastic SSOP (GN package), 0.65mm pitch, JEDEC MO-153 compliant, θJA = 150°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SSW (Pin 2) | Drain of Small P-Channel MOSFET | Carries low-load current (<260mA peak); used with dedicated inductor/diode for high-efficiency light-load operation. |
| BSW (Pin 4) | Drain of Large P-Channel MOSFET | Activated with SSW above 260mA peak or ITH > 0.6V; enables high-current delivery while minimizing conduction loss. |
| SGND (Pin 5) | Small-Signal Ground Reference | Must be routed separately from PGND to avoid noise coupling into feedback and control circuitry. |
| RUN/SS (Pin 7) | Soft-Start & Enable Control | Capacitor-to-ground sets ramp time (~0.5s/µF); <1.3V forces shutdown; clamped at 6V for VIN > 6V. |
| LBO (Pin 9) | Open-Drain Low-Battery Output | Sinks current when LBI falls below 1.19V; requires external pull-up for MCU wake-up or battery alert signaling. |
| LBI (Pin 10) | Low-Battery Input Comparator (+) | Compares against internal 1.19V reference; grounded with RUN/SS disables comparator during shutdown. |
| VPROG (Pin 11) | Output Voltage Programming Input | 0V → 3.3V output; VIN → 5V output; open → adjustable via external resistor divider on VOSENSE. |
| VOSENSE (Pin 12) | Feedback Voltage Input | Connects to output (fixed) or divider midpoint (adjustable); sets regulation point for error amplifier GM. |
| ITH (Pin 13) | Error Amplifier Compensation Node | Controls peak inductor current threshold; nominal 0–2.4V range; external RC network stabilizes loop response. |
| POR (Pin 14) | Open-Drain Power-On Reset Output | Pulls low when VOUT is >7.5% out of regulation; releases after 65536 cycles once VOUT within 5% of target. |
| COSC (Pin 15) | Oscillator Timing Capacitor | External capacitor sets base frequency; PLL LPF voltage shifts frequency ±30% around center. |
| PLL LPF (Pin 16) | Phase Detector Output / Oscillator Control | 0–2.4V analog control input to VCO; RC low-pass filter required for stable PLL lock; tie to SGND if unused. |
| PLLIN (Pin 17) | External Clock Synchronization Input | Accepts logic-level sync signal (0–2.4V); 50kΩ internal termination to SGND; disable by grounding. |
| SVIN (Pin 18) | Control Circuit Supply | Powers bias, reference, and logic blocks; decouple with 0.1µF ceramic near pin. |
| PGND (Pin 19) | Switch Driver Ground | Return path for MOSFET drivers and catch diode; connect CIN (–) and Schottky cathode here. |
| PWRVIN (Pin 20) | Power MOSFET Supply | Directly powers P-channel switches; requires low-ESR bulk decoupling (e.g., 100µF tantalum). |
| NC (Pins 1, 3, 6, 8) | No Connection | Not internally bonded; leave unconnected and unpopulated on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Phase-Lockable Oscillator | Enables synchronous switching with system clocks to eliminate beat frequencies and reduce conducted EMI in RF modules. |
| Adaptive Power™ Dual-FET Architecture | Automatically selects optimal switch combination (small-only or both) to maintain >90% efficiency from 1mA to 450mA load. |
| 100% Duty-Cycle Dropout Operation | Permits regulation down to VIN ≈ VOUT + (ILOAD × RDS(ON)), extending usable battery range in low-VIN scenarios. |
| Integrated Low-Battery Detector & POR | Eliminates need for external supervisors; shares same 1.19V reference for consistent trip points and reduced BOM count. |
| Current-Mode Control with Fast Transient Response | Provides inherent cycle-by-cycle current limiting and superior line/load regulation (<0.8% load reg) for dynamic digital loads. |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Powering baseband processor and RF transceiver from single Li-ion cell (3.0–4.2V) with tight ripple and fast load transient response. IC Role / Device Role / Timing Role: Primary step-down regulator delivering 3.3V at up to 450mA; PLL synchronizes switching to baseband clock to suppress noise in receive band. Use Value: Enables clean power delivery without interfering with sensitive RF front-end; 15µA shutdown current preserves standby battery life. | Use Scenario: Supplying DSP, memory, and LTE/Wi-Fi radio in compact IoT gateway with thermal constraints and long battery life requirements. IC Role / Device Role / Timing Role: High-efficiency buck converter operating in Adaptive Power™ mode to sustain >92% efficiency across 0.1–450mA load range. Use Value: Dual-inductor configuration (SSW + BSW) reduces light-load losses by ~3%, directly extending operational runtime per charge cycle. |
| Portable Instruments | Distributed Power Systems |
Use Scenario: Regulating 5V rail for precision ADCs, op-amps, and microcontrollers in handheld test equipment powered by alkaline batteries. IC Role / Device Role / Timing Role: Fixed-frequency buck converter with ±1% reference accuracy and low dropout to maintain regulation as battery voltage declines from 6V to 3.2V. Use Value: Internal low-battery detector (1.19V ±20mV) triggers graceful shutdown before measurement drift occurs, ensuring data integrity. | Use Scenario: Local point-of-load conversion in telecom line card with multiple isolated rails requiring synchronized switching to minimize magnetic coupling. IC Role / Device Role / Timing Role: PLL-enabled buck converter locked to backplane clock (e.g., 10MHz) to align switching edges across multiple LTC1434CGN#PBF units. Use Value: Eliminates sub-harmonic beat frequencies between adjacent converters, reducing radiated emissions and improving signal integrity. |
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 |
|---|---|---|---|
| LTC1433CGN#PBF | No PLL circuitry (no PLLIN/PLL LPF pins); fixed 112–142kHz oscillator only; identical pinout except missing Pins 16–17. | Suitable where EMI synchronization is unnecessary; lower cost and simpler layout for non-RF applications. | Select LTC1433CGN#PBF when system clock sync is not required and BOM cost optimization is prioritized. |
| TPS62231DRYT | Higher 3MHz switching frequency; smaller external components; 3.6V max input; no low-battery detector or POR; different pinout and control interface. | Better suited for space-constrained applications with stable 3.3V input; lacks integrated supervision functions needed in battery-gauging systems. | Choose TPS62231DRYT for ultra-compact designs with regulated input and no battery monitoring requirement. |
Compared with LTC1433CGN#PBF, the LTC1434CGN#PBF adds PLL synchronization at the cost of two extra pins and slightly higher quiescent current in PLL-active mode; versus TPS62231DRYT, it offers wider input range, integrated supervision, and higher current capability but requires larger magnetics and layout area.
Availability
LTC1434CGN#PBF is available at Aetrix Electronics and suitable for cellular telephones, wireless modems, and portable instruments requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC1434CGN#PBF 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. (ADI) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC1434CGN#PBF belongs to ADI's legacy Linear Technology DC/DC converter product line, designed specifically for high-efficiency, low-noise power conversion in battery-powered RF and portable instrumentation applications.
FAQ
What is the maximum input voltage rating for the LTC1434CGN#PBF?
The absolute maximum input voltage for PWRVIN and SVIN pins of the LTC1434CGN#PBF is 13.5V. Exceeding this value risks permanent damage. The device operates over a functional input range of 3V to 13.5V, with guaranteed performance across the full commercial temperature range (0°C to 70°C). For reliable long-term operation, design margins should keep VIN ≤ 12.5V under worst-case conditions.
Does the LTC1434CGN#PBF support adjustable output voltage, and how is it configured?
Yes, the LTC1434CGN#PBF supports adjustable output voltage. To configure it, leave the VPROG pin open (DC floating), connect VOSENSE to the junction of an external resistor divider across the output, and select R1/R2 values using VOUT = 1.19V × (1 + R2/R1). The internal 1.19V reference ensures ±1% accuracy across temperature, and a 100pF capacitor across R1 is recommended to suppress noise pickup at VOSENSE.
How does the Adaptive Power™ feature improve efficiency in the LTC1434CGN#PBF?
The Adaptive Power™ feature in the LTC1434CGN#PBF improves efficiency by dynamically selecting between the small-FET (RDS(ON) = 4.1Ω) and both FETs (combined RDS(ON) ≈ 0.6Ω) based on real-time load demand. At light loads (<260mA peak inductor current and ITH < 0.6V), only the small-FET operates - reducing gate charge and switching losses. This maintains >90% efficiency down to 1mA, unlike fixed-FET converters that suffer disproportionate losses at low current.
Can the LTC1434CGN#PBF be synchronized to an external clock, and what pins are involved?
Yes, the LTC1434CGN#PBF supports external clock synchronization via its integrated PLL. The required pins are PLLIN (Pin 17, accepts 0–2.4V logic sync signal) and PLL LPF (Pin 16, phase detector output and VCO control node). A series RC network from PLL LPF to ground sets loop bandwidth. When PLLIN is unconnected or grounded, the oscillator reverts to its base frequency set by COSC. The LTC1433CGN#PBF lacks these pins and cannot be synchronized.
What is the purpose of the RUN/SS pin on the LTC1434CGN#PBF, and how is soft-start implemented?
The RUN/SS pin (Pin 7) on the LTC1434CGN#PBF serves dual functions: enabling/disabling the regulator and controlling soft-start timing. Applying <1.3V shuts down all circuitry except the low-battery comparator. For soft-start, a capacitor from RUN/SS to ground creates a linear ramp; the internal 3µA current source charges it, and main regulation begins when voltage reaches ~1.3V. Ramp time ≈ 0.5 seconds per µF, preventing inrush current and output overshoot during power-up.
LTC1434CGN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC1434CGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1434CGN#PBF 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#PBF reliable?
The price and inventory of LTC1434CGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1434CGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC1434CGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1434CGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1434CGN#PBF?
LTC1434CGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1434CGN#PBF 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#PBF?
For technical support, including LTC1434CGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1434CGN#PBF requirements.
6.How does Aetrix verify that LTC1434CGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1434CGN#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC1434CGN#PBF?
All LTC1434CGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1434CGN#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC1434CGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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