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Analog Devices Inc. LTC1433CGN#PBF
- Part No.:
- LTC1433CGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1433CGN#PBF.pdf
- Description:
- IC REG BUCK ADJ 450MA 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,969
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Product details
Overview
LTC1433CGN#PBF from Analog Devices (formerly Linear Technology) is a monolithic current-mode step-down DC/DC converter with dual internal P-channel MOSFETs, 3V–13.5V input range, ±1% reference accuracy, and 450mA output capability. It delivers up to 93% efficiency in portable RF communications and battery-powered instrumentation.
For engineers reviewing the LTC1433CGN#PBF datasheet, LTC1433CGN#PBF pinout, LTC1433CGN#PBF application, or LTC1433CGN#PBF equivalent, key selection criteria include its adaptive power switching architecture, low-quiescent-current shutdown (15µA), integrated low-battery detector (±2.4% accuracy), and 16-lead narrow SSOP package with verified pin mapping.
Technical Context
The LTC1433CGN#PBF employs fixed-frequency current-mode control with an internal 1.19V reference and error amplifier driving the ITH compensation node. Its Adaptive Power stage selectively activates either the small (RDS(ON) = 4.1Ω) or large (RDS(ON) = 1.2Ω) P-channel MOSFET based on load current and ITH voltage thresholds-enabling high efficiency across 1mA–450mA loads without frequency modulation.
It integrates a 65536-cycle power-on reset timer (300ms typical at 125kHz), open-drain LBO/POR outputs with 40mV hysteresis, and soft-start via RUN/SS pin with 1.2–4.5µA current source. The device operates over 0°C–70°C and supports dropout down to 100% duty cycle with no external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 13.5V - supports single-cell Li-ion, multi-cell alkaline, and distributed 5V/12V rails without external regulators. |
| Output Current | Up to 450mA - sufficient for powering baseband processors, RF transceivers, and analog front-ends in portable modems. |
| Reference Accuracy | ±1% - ensures stable 3.3V/5V or adjustable output regulation under line/load/temperature variation. |
| Quiescent Current | 470µA (active), 15µA (shutdown) - extends battery life in always-on wireless sensors and handheld instruments. |
| Oscillator Frequency | 112–142kHz (COSC = 100pF) - balances EMI, inductor size, and MOSFET switching loss for compact designs. |
| Low-Battery Detection | 1.19V ±2.4% threshold with 40mV hysteresis - enables precise battery gauge integration without external comparators. |
| Power-On Reset Delay | 65536 oscillator cycles (~300ms at 125kHz) - provides deterministic system initialization timing after VOUT stabilizes. |
Pinout & Package
Package: 16-lead narrow SSOP (GN), 0.15mm pitch, JEDEC MS-013AC compliant, θJA = 150°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SSW (Pin 1) | Drain of small P-channel MOSFET | Carries up to 300mA peak current during light-load operation; connects to Schottky catch diode anode. |
| BSW (Pin 3) | Drain of large P-channel MOSFET | Activates under >260mA peak inductor current; parallel path with SSW reduces conduction loss at full load. |
| VOSENSE (Pin 10) | Feedback input to error amplifier | Monitors regulated output directly (fixed VOUT) or via external resistor divider (adjustable VOUT). |
| RUN/SS (Pin 6) | Soft-start capacitor input & shutdown control | 0.5s/µF ramp time; <1.3V forces complete shutdown except low-battery comparator. |
| LBI/LBO (Pins 8/7) | Low-battery comparator input/output | LBI compares against 1.19V reference; LBO sinks current when battery drops below trip point. |
| POR (Pin 12) | Power-on reset open-drain output | Pulls low until VOUT reaches within 5% of target and holds for 65536 clock cycles. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Power Switching | Selectively engages small or large P-MOSFET to maintain >85% efficiency from 1mA to 450mA load without changing frequency. |
| Integrated Low-Dropout Operation | 100% duty cycle capability enables regulation down to VIN – VDS(ON), critical for end-of-life battery support in portable equipment. |
| Internal Power-On Reset Timer | Hardware-based 300ms delay referenced to oscillator - eliminates need for external RC timing networks or microcontroller polling. |
| Low-Battery Detector with Hysteresis | 40mV hysteresis prevents oscillation during battery sag; matches output voltage accuracy (±2.4%) for consistent system-level monitoring. |
| Current-Mode Control Architecture | Provides inherent cycle-by-cycle current limiting and superior transient response to load steps common in RF burst transmission. |
Applications
| Cellular Baseband Power | Portable Instrumentation |
|---|---|
Use Scenario: Powers ARM Cortex-M4 MCU and ADC/DAC subsystems in handheld multimeters and data loggers running from two AA cells. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 3.3V at up to 450mA with <15µA shutdown current to preserve battery shelf life. Use Value: Enables 10+ hour runtime on alkaline batteries while maintaining ±1% output regulation across temperature and battery discharge curve. | Use Scenario: Supplies clean 5V rail to RF front-end ICs (e.g., TRF6901) in Bluetooth/Wi-Fi USB dongles with strict EMI limits. IC Role / Device Role / Timing Role: Fixed-frequency current-mode buck converter synchronized to host USB suspend/resume timing via RUN/SS pin control. Use Value: Delivers 93% peak efficiency at 12V input, reducing thermal stress in compact enclosures and meeting FCC Class B conducted emissions. |
| Wireless Modem Core | Distributed Power Systems |
Use Scenario: Regulates 3.3V for LTE modem baseband processor requiring fast load transient response during packet bursts. IC Role / Device Role / Timing Role: Adaptive-power buck converter using dual MOSFETs to sustain >85% efficiency during 10mA–400mA dynamic load swings. Use Value: Eliminates need for external current-sense resistors or complex loop compensation, simplifying layout and reducing BOM count. | Use Scenario: Provides local 3.3V supply to isolated sensor nodes in industrial IoT gateways powered from 12V backplane. IC Role / Device Role / Timing Role: High-input-voltage buck converter operating at 12V input with integrated low-battery detection for remote node health monitoring. Use Value: Integrates POR, LBO, and shutdown control in one IC - reducing supervisory circuit footprint by 40% versus discrete solutions. |
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 |
|---|---|---|---|
| TPS62231DRVR | 3MHz fixed-frequency, 300mA output, 2.05V–6.5V input, 1.5% reference accuracy | Higher switching frequency enables smaller inductors but lower max output current and narrower input range | Prefer for space-constrained designs needing <1mm height; avoid for >400mA or >13V input systems |
| MAX17503GCU+ | 4.5V–60V input, 600mA output, current-mode control, external MOSFETs required | Supports wide-input industrial rails but adds complexity and cost of external FETs and gate drivers | Choose for 24V/48V distributed systems; not suitable for battery-powered portables due to quiescent current (2.5mA) |
Compared with LTC1433CGN#PBF, TPS62231DRVR trades output current and input range for miniaturization, while MAX17503GCU+ expands input capability at the cost of higher BOM count and static power - making LTC1433CGN#PBF optimal for mid-power portable applications demanding integrated FETs and ultra-low shutdown current.
Availability
LTC1433CGN#PBF is available at Aetrix Electronics and suitable for cellular telephones, portable instruments, wireless modems, and RF communications systems requiring stable component supply with long-term lifecycle assurance.
Supply support for LTC1433CGN#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 acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for legacy Linear power products.
The LTC1433CGN#PBF belongs to Linear's precision monolithic DC/DC converter family, designed specifically for high-efficiency, low-noise power conversion in battery-sensitive portable electronics and RF subsystems.
FAQ
What is the maximum output current capability of the LTC1433CGN#PBF?
The LTC1433CGN#PBF delivers up to 450mA of continuous output current under typical conditions (TA = 25°C, VIN = 10V). Peak current capability depends on thermal design and input voltage - at VIN = 3.6V, maximum output current drops to ~300mA due to reduced headroom and increased RDS(ON). The device uses adaptive power switching to maintain efficiency across this range without external current sensing.
Does the LTC1433CGN#PBF support adjustable output voltage?
Yes, the LTC1433CGN#PBF supports adjustable output voltage via the VPROG pin. When VPROG is left open (DC), VOSENSE connects to an external resistor divider, enabling output voltages from 1.19V to VIN − 1.5V. The internal 1.19V reference ensures ±1% accuracy across temperature, and the VOSENSE pin provides remote sensing capability to compensate for PCB trace resistance.
How does the Adaptive Power feature improve efficiency in the LTC1433CGN#PBF?
The Adaptive Power feature in the LTC1433CGN#PBF dynamically selects between two internal P-channel MOSFETs: a small switch (RDS(ON) = 4.1Ω) for light loads (<260mA peak inductor current) and a large switch (RDS(ON) = 1.2Ω) for heavy loads. This reduces both conduction and gate charge losses, sustaining >85% efficiency from 1mA to 450mA - unlike fixed-FET converters that suffer efficiency collapse at light loads.
What is the function of the POR pin on the LTC1433CGN#PBF?
The POR (Power-On Reset) pin on the LTC1433CGN#PBF is an open-drain output that pulls low when the output voltage is outside ±5% regulation. After VOUT stabilizes, it remains asserted for exactly 65536 oscillator cycles (~300ms at 125kHz) before releasing. This provides a deterministic hardware reset signal for microcontrollers - eliminating software-based timing loops and ensuring reliable boot sequencing even during brown-out conditions.
Can the LTC1433CGN#PBF operate in dropout mode, and what happens to regulation?
Yes, the LTC1433CGN#PBF supports 100% duty cycle dropout operation. As VIN approaches VOUT, the controller extends the on-time until both P-channel MOSFETs remain fully enhanced. Regulation degrades linearly with VIN - e.g., at VIN = 3.6V and VOUT = 3.3V, output drops by ~120mV due to combined RDS(ON) drop. This behavior is explicitly characterized in the datasheet's dropout curves and requires no external components.
LTC1433CGN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC1433CGN#PBF FAQ
1.How can I place an order for LTC1433CGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1433CGN#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 LTC1433CGN#PBF reliable?
The price and inventory of LTC1433CGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1433CGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC1433CGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1433CGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1433CGN#PBF?
LTC1433CGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1433CGN#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 LTC1433CGN#PBF?
For technical support, including LTC1433CGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1433CGN#PBF requirements.
6.How does Aetrix verify that LTC1433CGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1433CGN#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 LTC1433CGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC1433CGN#PBF?
All LTC1433CGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1433CGN#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 LTC1433CGN#PBF part is unused and in its original packaging.
Return procedure for LTC1433CGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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