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Analog Devices Inc. LTC1433CGN#TRPBF
- Part No.:
- LTC1433CGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1433CGN#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 450MA 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,811
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Product details
Overview
LTC1433CGN#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic current-mode step-down DC/DC converter with dual P-channel MOSFETs, delivering up to 450mA output current, ±2.4% output voltage accuracy, and 93% peak efficiency. It operates from 3V to 13.5V input, supports adjustable or fixed 3.3V/5V outputs, and integrates low-battery detection and power-on reset-ideal for battery-powered RF modems and portable instrumentation.
For engineers reviewing the LTC1433CGN#TRPBF datasheet, LTC1433CGN#TRPBF pinout, LTC1433CGN#TRPBF application, or LTC1433CGN#TRPBF equivalent, key selection criteria include its adaptive power switching architecture, 16-pin narrow SSOP package, 125kHz typical oscillator frequency, dropout operation at 100% duty cycle, and compatibility with low-ESR tantalum or ceramic output capacitors in space-constrained portable designs.
Technical Context
The LTC1433CGN#TRPBF uses constant-frequency current-mode control with internal error amplifier compensation at the ITH pin and dual P-channel MOSFETs (RDS(ON) = 4.1Ω small FET, 1.2Ω big FET at 10V). Its Adaptive Power™ stage selectively activates one or both switches based on load current to minimize gate charge and conduction losses.
It features integrated functions including a ±1% 1.19V reference, low-battery comparator with 1.19V trip threshold and 40mV hysteresis, power-on reset timer with 65536-cycle delay (≈300ms at 125kHz), and soft-start via RUN/SS pin with 3µA internal current source-enabling stable startup under varying input and load conditions without external timing components.
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 alkaline (3.0–3.6V), and wide-input industrial rails. |
| Output Current | Up to 450mA - sufficient for powering baseband processors, RF transceivers, or analog sensor signal chains. |
| Output Voltage Accuracy | ±2.4% - ensures reliable regulation across line, load, and temperature for precision analog subsystems. |
| Quiescent Current | 470µA - enables multi-week battery life in always-on portable instruments with intermittent active cycles. |
| Oscillator Frequency | 112–142kHz (COSC = 100pF) - balances EMI, inductor size, and efficiency for compact PCB layouts. |
| Shutdown Current | 15µA - preserves battery charge during system sleep modes without requiring external load switches. |
| Dropout Operation | 100% duty cycle - maintains regulation down to VIN ≈ VOUT + ILOAD × RDS(ON), critical for end-of-discharge battery operation. |
| Reference Voltage | 1.19V ±1% - serves as stable feedback reference for both fixed and adjustable output configurations. |
Pinout & Package
Package: 16-lead narrow SSOP (GN), 0.15mm pitch, 5.0mm × 6.2mm footprint, JEDEC MS-013AC compliant. Thermal resistance θJA = 150°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SSW) | Drain of small P-MOSFET | Switches low-current loads; used alone below ~260mA peak inductor current to reduce gate loss. |
| 3 (BSW) | Drain of large P-MOSFET | Engages with SSW above 260mA peak current; parallel RDS(ON) reduces conduction loss at high load. |
| 5 (SGND) | Small-signal ground | Must be routed separately from PGND to avoid noise coupling into feedback and reference paths. |
| 6 (RUN/SS) | Soft-start & enable control | Capacitor to ground sets ramp time (~0.5s/µF); <1.3V disables all circuitry except LBI comparator. |
| 7 (LBO) | Low-battery open-drain output | Sinks current when LBI < 1.19V; requires external pull-up for MCU wake-up or display dimming logic. |
| 8 (LBI) | Low-battery comparator input | Monitors battery voltage against internal 1.19V reference; 40mV hysteresis prevents chatter near threshold. |
| 9 (VPROG) | Output voltage programming | GND → 3.3V, VIN → 5V, open → adjustable via external resistor divider at VOSENSE. |
| 10 (VOSENSE) | Feedback input | Connects to output (fixed) or divider midpoint (adjustable); high-impedance node sensitive to layout parasitics. |
| 11 (ITH) | Error amplifier output | Compensation point for loop stability; voltage controls peak inductor current threshold in current-mode control. |
| 12 (POR) | Power-on reset open-drain | Pulls low until output reaches −5% regulation, then releases after 65536 oscillator cycles (~300ms). |
| 13 (COSC) | Oscillator timing capacitor | 100pF sets ~125kHz; value scales inversely with frequency; PLL LPF pin tied to SGND for LTC1433. |
| 14 (SVIN) | Analog supply rail | Provides clean bias for control circuitry; decoupled separately from PWRVIN to suppress switching noise. |
| 15 (PGND) | Power switch ground | Return path for high di/dt switch currents; must connect directly to CIN(−) and Schottky cathode. |
| 16 (PWRVIN) | Power MOSFET supply | High-current input for internal switches; requires low-ESR bulk capacitance close to pin. |
| 2,4 (NC) | No connection | Not internally bonded; leave unconnected and unpopulated on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Power™ switching | Selectively drives small or both P-MOSFETs to maintain >85% efficiency from 1mA to 450mA load. |
| Integrated low-battery detector | 1.19V trip with 40mV hysteresis and independent LBO output-eliminates need for external supervisor IC. |
| Power-on reset with programmable delay | 65536-cycle counter referenced to oscillator ensures deterministic reset timing across input voltage range. |
| 100% duty-cycle dropout mode | Enables continuous regulation down to VIN = VOUT + ILOAD×RDS(ON), extending usable battery life by ~15% in Li-ion applications. |
| Current-mode control architecture | Provides inherent cycle-by-cycle current limiting, fast transient response (<10µs), and simplified loop compensation. |
| Adjustable/fixed output selection | VPROG pin configures 3.3V, 5V, or 1.19V × (1+R2/R1) without external op-amps or DACs. |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Powering baseband processor core and RF front-end in GSM/EDGE handsets with single Li-ion cell. IC Role / Device Role / Timing Role: Primary step-down regulator delivering 3.3V at up to 450mA with adaptive switching to extend talk time. Use Value: 93% peak efficiency and 15µA shutdown current enable >10-hour standby and >3-hour continuous transmission per charge. | Use Scenario: Supplying 3.3V to LTE Cat-M1 modem IC and associated PMIC in IoT asset trackers. IC Role / Device Role / Timing Role: Main DC/DC converter with POR and LBO signals feeding host MCU for battery health monitoring and graceful shutdown. Use Value: Integrated low-battery detection and power-on reset eliminate two external components, reducing BOM count and PCB area by 12mm². |
| Portable Instruments | RF Communications |
Use Scenario: Regulating 5V for precision ADC, op-amp signal chain, and LCD backlight in handheld multimeters. IC Role / Device Role / Timing Role: Fixed 5V output converter with ±2.4% accuracy and low 470µA quiescent current for long battery life. Use Value: Tight output tolerance ensures ADC reference stability; low IQ supports >200-hour battery runtime in measurement mode. | Use Scenario: Providing 3.3V to 2.4GHz transceiver IC in Bluetooth LE audio earbuds with aggressive size constraints. IC Role / Device Role / Timing Role: Compact 16-pin SSOP DC/DC with dual-inductor support for ultra-low-noise 3.3V rail in RF-sensitive layout. Use Value: Dual-PFET architecture enables 3% higher efficiency at 10mA load vs single-inductor design, directly improving RF sensitivity by 0.8dB. |
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 |
|---|---|---|---|
| TPS62231DRYR | 3MHz fixed-frequency, 600mA output, 2.05V–6.5V input, 1.5% accuracy, 17µA IQ | Higher switching frequency enables smaller inductors but increases EMI filtering complexity | Preferred for space-constrained designs where 3MHz allows ≤1µH inductors; less suitable for low-EMI RF sections. |
| MAX17503GCU+ | 4.5V–60V input, 600mA, current-mode, adjustable frequency (100kHz–2.2MHz), external MOSFETs | Wide-input industrial grade with external FETs; no integrated low-battery detector or POR | Chosen for 24V industrial sensors needing robust input protection; requires additional supervisor IC for battery monitoring. |
Compared with TPS62231DRYR and MAX17503GCU+, the LTC1433CGN#TRPBF offers superior integration of battery monitoring (LBI/LBO) and power sequencing (POR) in a compact 16-pin SSOP, making it optimal for cost-sensitive, battery-powered portable systems where component count and layout simplicity are critical.
Availability
LTC1433CGN#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, wireless modems, and portable instrumentation requiring stable component supply with full traceability and lifecycle management.
Supply support for LTC1433CGN#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC1433CGN#TRPBF belongs to ADI's legacy Linear Technology DC/DC converter portfolio, designed specifically for high-efficiency, low-noise power conversion in battery-powered portable electronics with integrated system supervision functions.
FAQ
What is the maximum output current capability of the LTC1433CGN#TRPBF?
The LTC1433CGN#TRPBF delivers up to 450mA of continuous output current under typical conditions (TA = 25°C, VIN = 10V, VOUT = 3.3V). Actual achievable current depends on thermal design, input voltage, and output voltage-e.g., at VIN = 3.6V and VOUT = 3.3V, maximum output drops to ~300mA due to reduced headroom and increased conduction loss. The device's dual-PFET architecture maintains regulation across this range using 100% duty-cycle dropout mode.
How does the Adaptive Power™ feature improve efficiency in the LTC1433CGN#TRPBF?
The LTC1433CGN#TRPBF's Adaptive Power™ feature dynamically selects between its small (4.1Ω) and large (1.2Ω) internal P-channel MOSFETs based on load demand. Below ~260mA peak inductor current, only the small FET operates-reducing gate charge and switching losses. Above that threshold, both FETs engage to lower conduction loss. This dual-stage approach sustains >85% efficiency from 1mA to 450mA, significantly outperforming single-FET converters in battery-powered applications with variable load profiles.
Can the LTC1433CGN#TRPBF be used with an external resistor divider for adjustable output voltage?
Yes, the LTC1433CGN#TRPBF supports adjustable output voltage via an external resistor divider. When the VPROG pin is left open (DC), the VOSENSE pin connects to the midpoint of the divider, and the output follows VOUT = 1.19V × (1 + R2/R1). The datasheet specifies ±1% reference accuracy and <0.01%/V line regulation, enabling precise outputs such as 2.5V, 3.3V, or 5.0V. A 100pF capacitor across R1 is recommended to suppress noise coupling into the high-impedance VOSENSE node.
What is the function of the POR pin on the LTC1433CGN#TRPBF, and how is it used?
The POR (Power-On Reset) pin on the LTC1433CGN#TRPBF is an open-drain output that asserts low when the regulated output voltage deviates by more than 7.5% from target, and releases after 65536 oscillator cycles (~300ms at 125kHz) once regulation is restored. It requires an external pull-up resistor (typically 10kΩ to VCC) and interfaces directly with microcontroller reset inputs. Unlike many supervisors, POR remains active during shutdown, providing fail-safe reset signaling even when the main converter is disabled.
Does the LTC1433CGN#TRPBF require external components for basic operation, and what are the minimum required?
Yes, the LTC1433CGN#TRPBF requires external components for basic operation. Minimum required parts are: (1) input capacitor (≥10µF low-ESR ceramic/tantalum at PWRVIN), (2) output capacitor (≥100µF low-ESR tantalum or polymer at VOUT), (3) power inductor (22µH typical), (4) Schottky catch diode (e.g., MBRS130LT3), (5) COSC timing capacitor (100pF for ~125kHz), and (6) soft-start capacitor at RUN/SS (optional but recommended). No external compensation or feedback resistors are needed for fixed 3.3V/5V outputs.
LTC1433CGN#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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC1433CGN#TRPBF FAQ
1.How can I place an order for LTC1433CGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1433CGN#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 LTC1433CGN#TRPBF reliable?
The price and inventory of LTC1433CGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1433CGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1433CGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1433CGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1433CGN#TRPBF?
LTC1433CGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1433CGN#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 LTC1433CGN#TRPBF?
For technical support, including LTC1433CGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1433CGN#TRPBF requirements.
6.How does Aetrix verify that LTC1433CGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1433CGN#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 LTC1433CGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1433CGN#TRPBF?
All LTC1433CGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1433CGN#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 LTC1433CGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC1433CGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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