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Analog Devices Inc. LTC1433IGN#TRPBF
- Part No.:
- LTC1433IGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1433IGN#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 450MA 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,587
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Product details
Overview
LTC1433IGN#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic 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 112–142kHz frequency, supports low-dropout 100% duty cycle, and integrates low-battery detection and power-on reset-ideal for portable RF modems and battery-powered instrumentation.
For engineers reviewing the LTC1433IGN#TRPBF datasheet, LTC1433IGN#TRPBF pinout, LTC1433IGN#TRPBF application, or LTC1433IGN#TRPBF equivalent, key selection criteria include its dual-PFET Adaptive Power architecture, 470µA quiescent current, ±1% reference accuracy, 16-lead narrow SSOP package, and compatibility with 3.3V/5V/adjustable output configurations via VPROG pin.
Technical Context
The LTC1433IGN#TRPBF employs constant-frequency current-mode control with two internal P-channel MOSFETs (RDS(ON) = 3.3Ω small FET, 0.8Ω big FET at 10V), dynamically selecting between them based on load current to maintain high efficiency across light-to-heavy loads. Its Adaptive Power stage reduces switching losses below 260mA peak inductor current.
It features a 1.19V precision reference, integrated POR timer (65536 cycles ≈300ms), open-drain LBO and POR outputs, soft-start via RUN/SS pin, and VOSENSE feedback with external resistor divider support. The device lacks PLL circuitry-distinguishing it from the LTC1434 variant-and uses COSC pin to set oscillator frequency without synchronization capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Up to 450mA continuous-supports compact power rails in space-constrained portable devices. |
| Input Voltage Range | 3V to 13.5V-enables direct operation from single Li-ion, multi-cell alkaline, or intermediate bus supplies. |
| Efficiency | Up to 93% at 3.3V out / 5V in-minimizes thermal load and extends battery runtime in handheld instruments. |
| Quiescent Current | 470µA normal mode; 15µA shutdown-critical for always-on monitoring circuits with long standby periods. |
| Reference Accuracy | ±1% over temperature-ensures stable regulation for precision analog subsystems and ADC references. |
| Oscillator Frequency | 112–142kHz (COSC = 100pF)-balances EMI control, inductor size, and gate loss for portable designs. |
| Dropout Operation | 100% duty cycle enabled-maintains regulation down to VIN ≈ VOUT + IOUT × RDS(ON), supporting brownout resilience. |
| Package | 16-lead narrow SSOP (GN)-0.65mm pitch, surface-mount compatible with standard reflow profiles. |
Pinout & Package
Package: 16-lead narrow plastic SSOP (GN), 5.0mm × 6.2mm body, 0.65mm lead pitch, JEDEC MO-153 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SSW (Pin 1) | Drain of small P-channel MOSFET | Carries up to 300mA peak; used alone under light loads to reduce switching/gate losses. |
| BSW (Pin 3) | Drain of large P-channel MOSFET | Carries up to 1.2A peak; activated above 260mA inductor current for high-efficiency heavy-load operation. |
| SGND (Pin 5) | Small-signal ground | Must be routed separately from PGND to minimize noise coupling into feedback and reference paths. |
| RUN/SS (Pin 6) | Soft-start and enable control | Pulling <1.3V disables all circuitry except LBI comparator; capacitor to ground sets ramp time (~0.5s/µF). |
| LBO (Pin 7) | Open-drain low-battery output | Sinks current when LBI falls below 1.19V ±40mV hysteresis-signals system-level battery exhaustion. |
| LBI (Pin 8) | Low-battery comparator input | Compares against internal 1.19V reference; grounding with RUN/SS disables comparator and shuts down entire IC. |
| VPROG (Pin 9) | Output voltage programming | 0V → 3.3V output; VIN → 5V output; open → adjustable via external resistor divider on VOSENSE. |
| VOSENSE (Pin 10) | Feedback voltage input | Connects to output (fixed) or divider midpoint (adjustable); error amplifier compares to 1.19V reference. |
| ITH (Pin 11) | Error amplifier compensation node | Controls peak current threshold; nominal 0–2.4V range-used for loop compensation and current limit setting. |
| POR (Pin 12) | Open-drain power-on reset output | Pulls low until VOUT reaches within 5% of regulation, then releases after 65536 oscillator cycles (~300ms). |
| COSC (Pin 13) | Oscillator timing capacitor | External capacitor sets frequency (112–142kHz typ); no PLL-unlike LTC1434, no synchronization capability. |
| SVIN (Pin 14) | Control circuit supply | Provides bias for internal logic, comparators, and error amp; decoupled separately from PWRVIN. |
| PGND (Pin 15) | Switch driver ground | Return path for high-current MOSFET drivers and catch diode anode-must connect near CIN negative terminal. |
| PWRVIN (Pin 16) | Power MOSFET supply | Direct connection to input source for high-side switches; requires local ceramic decoupling to PGND. |
| NC (Pins 2, 4) | No connection | Not internally bonded-must remain unconnected per datasheet; no routing or thermal relief required. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Power dual-FET architecture | Selectively engages small or large P-channel switch to optimize efficiency across 10µA–450mA load range. |
| Integrated low-battery detector | 1.19V ±40mV hysteresis comparator with open-drain LBO output-enables autonomous battery management without external components. |
| Power-on reset with programmable delay | 65536-cycle counter (≈300ms at 125kHz) ensures reliable microcontroller reset after stable VOUT is achieved. |
| 100% duty-cycle dropout operation | Maintains regulation as VIN approaches VOUT by holding MOSFETs fully on-critical for Li-ion end-of-discharge operation. |
| Adjustable/3.3V/5V output selection | VPROG pin enables three configuration modes without external resistors-reduces BOM count and layout complexity. |
| Low-noise current-mode control | Delivers excellent line/load transient response (<10µs recovery) and stable regulation under dynamic RF load conditions. |
Applications
| Cellular Telephones | Portable Instruments |
|---|---|
Use Scenario: Powering baseband processor core and RF transceiver sections from single-cell Li-ion battery (3.0–4.2V). IC Role / Device Role / Timing Role: Primary step-down regulator generating clean 3.3V rail with fast transient response to handle burst TX current demands. Use Value: 470µA quiescent current extends standby time; 93% peak efficiency minimizes heat in sealed handset enclosures. | Use Scenario: Supplying precision analog front-end (AFE), ADC, and microcontroller in handheld multimeter or gas detector. IC Role / Device Role / Timing Role: Main DC/DC converter delivering stable 5V for analog circuitry and 3.3V for digital logic, with remote sensing capability. Use Value: ±1% reference accuracy ensures measurement integrity; low dropout maintains regulation during battery sag under load. |
| Wireless Modems | Battery-Powered Equipment |
Use Scenario: Providing regulated 3.3V to Wi-Fi/BT SoC and associated RF filters in embedded IoT gateway modules. IC Role / Device Role / Timing Role: High-efficiency buck converter operating from 3.6–12V wide-input industrial battery packs. Use Value: Dual-PFET Adaptive Power sustains >85% efficiency at 10mA sleep current and >90% at 300mA active current. | Use Scenario: Powering portable medical sensors (e.g., pulse oximeters) requiring ultra-low shutdown current and precise voltage stability. IC Role / Device Role / Timing Role: Primary power management IC enabling <15µA shutdown state and accurate 3.3V output for sensor signal conditioning. Use Value: 15µA shutdown current preserves battery charge over months of storage; ±2.4% output accuracy meets clinical-grade requirements. |
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 |
|---|---|---|---|
| LTC1434IGN#TRPBF | Includes PLLIN/PLL LPF pins for external clock synchronization; otherwise identical pinout, specs, and performance. | Required only when system-level clock domain alignment (e.g., to MCU or RF synthesizer) is needed. | Select LTC1434IGN#TRPBF if phase-locking to external clock is mandatory; otherwise LTC1433IGN#TRPBF offers same regulation with simpler layout. |
| TPS62231DRYR | Higher 3MHz switching frequency, smaller external components, but lower 300mA output current and no low-battery detector. | Suitable for ultra-compact designs where size outweighs battery-monitoring needs and load current ≤300mA. | Choose TPS62231DRYR for space-constrained consumer wearables; LTC1433IGN#TRPBF remains preferred for industrial portable instruments needing LBI and 450mA drive. |
Compared with LTC1434IGN#TRPBF, the LTC1433IGN#TRPBF omits synchronization circuitry-reducing component count and EMI sensitivity-while matching all regulation, efficiency, and protection features. Against TPS62231DRYR, it trades higher frequency for greater output current, integrated battery monitoring, and wider input range-making it more suitable for ruggedized portable equipment.
Availability
LTC1433IGN#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, portable instruments, and wireless modems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC1433IGN#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 LTC1433IGN#TRPBF belongs to Linear's legacy high-efficiency current-mode DC/DC converter family, designed specifically for battery-powered portable electronics demanding low quiescent current, robust dropout behavior, and integrated system supervision functions.
FAQ
What is the maximum output current capability of the LTC1433IGN#TRPBF?
The LTC1433IGN#TRPBF delivers up to 450mA of continuous output current under typical conditions (VIN ≥ 5V, TA = 25°C). Peak current capability depends on thermal design and input voltage-e.g., at VIN = 3.6V, max output drops to ~350mA due to reduced headroom and higher RDS(ON). Derating is required above 70°C ambient per θJA = 150°C/W.
Does the LTC1433IGN#TRPBF support adjustable output voltage?
Yes, the LTC1433IGN#TRPBF supports adjustable output voltage via the VOSENSE and VPROG pins. When VPROG is left open (DC), VOSENSE connects to an external resistor divider across the output, enabling regulation at any voltage ≥1.19V 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 feature improve efficiency in the LTC1433IGN#TRPBF?
The Adaptive Power feature in the LTC1433IGN#TRPBF automatically selects between its internal small and large P-channel MOSFETs based on load demand. Below ~260mA peak inductor current, only the small FET (RDS(ON) = 3.3Ω) operates-reducing gate charge and switching losses. Above that threshold, both FETs engage, leveraging the low 0.8Ω RDS(ON) of the large FET for high-current efficiency-yielding >85% efficiency from 10µA to 450mA.
What is the function of the POR pin on the LTC1433IGN#TRPBF?
The POR (Power-On Reset) pin on the LTC1433IGN#TRPBF is an open-drain output that pulls low whenever the regulated output voltage deviates by more than 7.5% from target, or during startup/shutdown. After VOUT stabilizes within 5% of regulation, an internal 65536-cycle timer (≈300ms at 125kHz) elapses before POR releases-providing a clean, debounced reset signal for connected microcontrollers or FPGAs without external timing components.
Can the LTC1433IGN#TRPBF operate in dropout mode, and what happens to regulation?
Yes, the LTC1433IGN#TRPBF supports 100% duty-cycle dropout operation. As input voltage decreases toward the output level, the controller holds the P-channel MOSFETs fully on, causing VOUT to track VIN minus IOUT × RDS(ON). Regulation degrades linearly in this region, but the device continues supplying current without shutdown-enabling graceful operation down to VIN ≈ VOUT + 450mA × 0.6Ω ≈ VOUT + 0.27V, critical for Li-ion battery end-of-discharge scenarios.
LTC1433IGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 16-SSOP
LTC1433IGN#TRPBF FAQ
1.How can I place an order for LTC1433IGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1433IGN#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 LTC1433IGN#TRPBF reliable?
The price and inventory of LTC1433IGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1433IGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1433IGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1433IGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1433IGN#TRPBF?
LTC1433IGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1433IGN#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 LTC1433IGN#TRPBF?
For technical support, including LTC1433IGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1433IGN#TRPBF requirements.
6.How does Aetrix verify that LTC1433IGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1433IGN#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 LTC1433IGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1433IGN#TRPBF?
All LTC1433IGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1433IGN#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 LTC1433IGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC1433IGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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