My Inquiry
My Account
Analog Devices Inc. LTC1434IGN#PBF
- Part No.:
- LTC1434IGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1434IGN#PBF.pdf
- Description:
- IC REG BUCK ADJ 450MA 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,326
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC1434IGN#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, 125kHz typical switching frequency, and 93% peak efficiency. It integrates dual P-channel MOSFETs (0.6Ω combined RDS(ON) at 10V), supports 3V–13.5V input, and enables low-noise power for RF communications and portable instrumentation.
For engineers reviewing the LTC1434IGN#PBF datasheet, LTC1434IGN#PBF pinout, LTC1434IGN#PBF application, or LTC1434IGN#PBF equivalent, key selection criteria include its PLL-synchronizable oscillator, adaptive power stage for load-dependent FET selection, dropout operation at 100% duty cycle, and integrated low-battery detection with ±1% reference accuracy.
Technical Context
The LTC1434IGN#PBF implements fixed-frequency current-mode control with an internal 1.19V reference and error amplifier driving the ITH compensation node. Its dual-PFET architecture dynamically selects between small-FET-only (≤260mA peak inductor current, ≤0.6V ITH) and dual-FET operation to optimize efficiency across load range.
Phase-locked loop functionality-exclusive to the LTC1434 variant-accepts external clock via PLLIN, modulates oscillator frequency through PLL LPF (0–2.4V control range), and aligns MOSFET turn-on to rising edges of synchronizing signal. The device operates over –40°C to 85°C (I-grade) and features integrated POR (65536-cycle delay), LBO open-drain output, and RUN/SS soft-start control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Up to 450mA continuous; supports high transient loads without foldback. |
| Input Voltage Range | 3V to 13.5V; enables single-cell Li-ion to multi-cell NiMH/battery-backed systems. |
| Switching Frequency | 112–142kHz (COSC = 100pF); PLL-synchronizable up to ±30% center frequency shift. |
| Efficiency | Up to 93% at full load; maintained via adaptive dual-FET power stage reducing gate charge loss at light loads. |
| Reference Accuracy | ±1% over temperature; ensures stable 3.3V/5V/fixed or adjustable output regulation. |
| Quiescent Current | 470µA operating; drops to 15µA in complete shutdown-critical for battery longevity. |
| Dropout Behavior | 100% duty cycle operation; sustains regulation as VIN approaches VOUT with minimal headroom. |
| Low-Battery Detection | ±2.4% accuracy match to output voltage; LBI threshold = 1.19V ±40mV hysteresis. |
Pinout & Package
Package: 16-lead narrow SSOP (GN), RoHS-compliant, moisture-sensitive level 3.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| SSW (Pin 1) | Drain of small P-channel MOSFET | Carries up to 300mA peak current; used alone under light-load adaptive mode. |
| BSW (Pin 3) | Drain of large P-channel MOSFET | Carries up to 1.2A peak; activated with SSW when load exceeds 260mA peak inductor current. |
| SGND (Pin 5) | Small-signal ground | Must be isolated from PGND to prevent noise coupling into feedback path. |
| RUN/SS (Pin 6) | Soft-start and enable control | Capacitor sets ramp time (~0.5s/µF); <1.3V forces shutdown except LBO comparator. |
| LBO (Pin 7) | Open-drain low-battery output | Sinks current when LBI falls below 1.19V; requires external pull-up for logic-level signaling. |
| LBI (Pin 8) | Low-battery comparator input | Compares against internal 1.19V reference; grounding disables LBO and shuts down control circuitry. |
| VPROG (Pin 9) | Output voltage programming | Selects 3.3V (0V), 5V (VIN), or adjustable mode (open); determines VOSENSE connection point. |
| VOSENSE (Pin 10) | Feedback voltage input | Connects to output (fixed) or divider midpoint (adjustable); referenced to 1.19V internal bandgap. |
| ITH (Pin 11) | Error amplifier compensation | 0–2.4V control node; sets current comparator threshold and stabilizes loop dynamics. |
| POR (Pin 12) | Power-on reset open-drain output | Pulls low until output reaches ±5% regulation, then releases after 65536 oscillator cycles. |
| COSC (Pin 13) | Oscillator timing capacitor | External cap (e.g., 100pF) sets base frequency; PLL LPF modulates charge current for synchronization. |
| PLL LPF (Pin 16) | PLL low-pass filter output | Drives oscillator frequency; 0–2.4V range corresponds to ±30% frequency deviation from center. |
| SVIN (Pin 14) | Control circuit supply | Provides bias for internal logic, reference, and error amp; decoupled separately from PWRVIN. |
| PGND (Pin 15) | Power ground | Return path for switch currents; must connect close to CIN (–) and Schottky cathode. |
| PWRVIN (Pin 16) | Power MOSFET supply | Bias for internal PFET drivers; requires low-ESR local decoupling to minimize switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Power Stage | Automatically engages only the small PFET below 260mA peak inductor current, cutting gate charge losses and boosting light-load efficiency by ~3%. |
| Phase-Lockable Oscillator | Enables EMI reduction via external clock synchronization-unique to LTC1434 among the family-and supports frequency shifting for spread-spectrum applications. |
| Integrated Low-Battery Detector | Shares same ±2.4% accuracy as output regulation; eliminates need for external supervisor IC in battery-powered systems. |
| 100% Duty-Cycle Dropout | Maintains regulated output as input drops to VOUT + (ILOAD × RDS(ON)), extending usable battery life in deep-discharge scenarios. |
| Power-On Reset Timer | Generates clean system reset after 65536 oscillator cycles once output stabilizes within ±5%, eliminating external RC timers. |
| Current-Mode Control | Delivers superior line/load transient response and inherent cycle-by-cycle current limiting-no external sense resistor required. |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Powering RF transceivers and baseband processors in GSM/UMTS handsets with tight ripple and noise budgets. IC Role / Device Role / Timing Role: Primary buck regulator supplying 3.3V core voltage with phase-locked switching to avoid interference with cellular bands. Use Value: 93% efficiency extends talk time; PLL synchronization prevents beat frequencies with TX LO signals. | Use Scenario: Providing stable 5V rail for USB interface and 3.3V for digital signal processor in portable broadband modems. IC Role / Device Role / Timing Role: Dual-output-capable buck controller managing multiple voltage domains while sharing one inductor in compact layout. Use Value: Adaptive FET selection maintains >85% efficiency from 1mA to 450mA, critical for intermittent data transmission. |
| Portable Instruments | RF Communications |
Use Scenario: Supplying precision analog front-end (AFE) and microcontroller in handheld multimeters and spectrum analyzers. IC Role / Device Role / Timing Role: Low-noise, low-quiescent-current DC/DC converter enabling battery operation for >100 hours per charge. Use Value: 470µA quiescent current and 15µA shutdown draw preserve battery capacity during standby and sleep modes. | Use Scenario: Biasing LNAs, mixers, and VCOs in point-to-point microwave radios where supply ripple directly impacts phase noise. IC Role / Device Role / Timing Role: Clean, synchronized power source minimizing spurious emissions in sensitive RF signal chains. Use Value: 1.19V ±1% reference and current-mode control limit output ripple to <10mVpp, preserving SNR. |
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#PBF | No PLLIN/PLL LPF pins; fixed 125kHz oscillator only; otherwise identical pinout, specs, and package. | Not suitable for EMI-sensitive or synchronized multi-rail systems requiring clock alignment. | Select when synchronization is unnecessary and cost minimization is prioritized. |
| TPS62231DRVR | 3MHz fixed-frequency, 600mA output, 2.05V–6.5V input; no adaptive FETs or LBO; different pinout and package (6-pin WSON). | Higher switching frequency enables smaller magnetics but lacks battery monitoring and dropout optimization. | Choose for space-constrained designs needing ultra-small footprint and higher output current, accepting trade-offs in battery-aware features. |
Compared with LTC1433IGN#PBF, the LTC1434IGN#PBF adds PLL synchronization for EMI control but shares identical thermal performance, efficiency curve, and protection features; versus TPS62231DRVR, it offers superior low-voltage operation (3V min), integrated LBO/POR, and adaptive efficiency-but requires larger board area and external magnetics.
Availability
LTC1434IGN#PBF is available at Aetrix Electronics and suitable for cellular telephones, wireless modems, and portable instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for LTC1434IGN#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 digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1434IGN#PBF belongs to ADI's legacy Linear Technology DC/DC converter product line, engineered specifically for battery-powered RF and portable systems demanding high efficiency, low noise, and intelligent power management features.
FAQ
What is the maximum output current capability of the LTC1434IGN#PBF?
The LTC1434IGN#PBF delivers up to 450mA of continuous output current under typical conditions (e.g., VIN = 10V, VOUT = 3.3V, TA = 25°C). Peak current capability depends on thermal design and input voltage-maximum output current decreases as input voltage drops below 4.5V, with minimum guaranteed operation at 3V input. Derating is required above 70°C ambient.
Does the LTC1434IGN#PBF support adjustable output voltage?
Yes, the LTC1434IGN#PBF supports adjustable output voltage via the VPROG and VOSENSE pins. When VPROG is left open (DC), VOSENSE connects to an external resistive divider, enabling output voltages from 1.19V upward using the formula 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 adaptive power stage in the LTC1434IGN#PBF improve efficiency?
The adaptive power stage in the LTC1434IGN#PBF uses two internal P-channel MOSFETs: a small-FET (RDS(ON) = 4.1Ω typ) and a large-FET (RDS(ON) = 1.2Ω typ). Below 260mA peak inductor current and 0.6V on the ITH pin, only the small-FET operates-reducing gate charge and conduction losses. This increases light-load efficiency by ~3% compared to single-FET solutions.
What is the function of the PLLIN and PLL LPF pins on the LTC1434IGN#PBF?
The PLLIN pin accepts an external clock signal to synchronize the LTC1434IGN#PBF's oscillator, while PLL LPF serves as both the phase detector output and oscillator frequency control input (0–2.4V range). Together, they enable EMI reduction, multi-rail clock alignment, and frequency shifting-features absent in the non-PLL LTC1433 variant.
Can the LTC1434IGN#PBF operate in dropout mode, and what happens to regulation?
Yes, the LTC1434IGN#PBF supports 100% duty-cycle dropout operation. As input voltage approaches the output voltage, the internal P-channel MOSFETs remain continuously on, and regulation is maintained by the RDS(ON) of the active FET(s). Output voltage becomes VOUT ≈ VIN − ILOAD × RDS(ON), with typical dropout voltage <300mV at 450mA due to low combined on-resistance (0.6Ω at 10V).
LTC1434IGN#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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
LTC1434IGN#PBF FAQ
1.How can I place an order for LTC1434IGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1434IGN#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 LTC1434IGN#PBF reliable?
The price and inventory of LTC1434IGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1434IGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC1434IGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1434IGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1434IGN#PBF?
LTC1434IGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1434IGN#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 LTC1434IGN#PBF?
For technical support, including LTC1434IGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1434IGN#PBF requirements.
6.How does Aetrix verify that LTC1434IGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1434IGN#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 LTC1434IGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC1434IGN#PBF?
All LTC1434IGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1434IGN#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 LTC1434IGN#PBF part is unused and in its original packaging.
Return procedure for LTC1434IGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1434IGN#PBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
