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Analog Devices Inc. LTC1433IGN#PBF
- Part No.:
- LTC1433IGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1433IGN#PBF.pdf
- Description:
- IC REG BUCK ADJ 450MA 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
LTC1433IGN#PBF from Analog Devices (formerly Linear Technology) is a monolithic current-mode step-down DC/DC converter optimized for battery-powered systems requiring high efficiency across wide load ranges. It delivers up to 450mA output current, supports 3V–13.5V input, provides ±1% reference accuracy, and integrates dual P-channel MOSFETs with 0.6Ω combined RDS(ON) at 10V - used in portable instruments and RF communications power rails.
For engineers reviewing the LTC1433IGN#PBF datasheet, LTC1433IGN#PBF pinout, LTC1433IGN#PBF application, or LTC1433IGN#PBF equivalent, key selection criteria include its adaptive power switching architecture, 125kHz typical oscillator frequency, low-quiescent-current operation (470µA), dropout capability at 100% duty cycle, and compatibility with fixed (3.3V/5V) or adjustable output configurations via VPROG pin.
Technical Context
The LTC1433IGN#PBF employs constant-frequency current-mode control with internal error amplifier compensation at ITH and dual-switch Adaptive Power operation: only the small FET (RDS(ON) = 4.1Ω typ) activates below 260mA peak inductor current, while both FETs engage above that threshold to sustain 450mA output. Its 16-pin narrow SSOP package routes critical analog and power grounds separately (SGND vs PGND) to minimize noise coupling.
It features integrated low-battery detection (LBI/LBO) referenced to the same 1.19V bandgap as VOSENSE, a power-on reset timer with 65536-cycle delay (≈300ms at 125kHz), and shutdown current of just 15µA. The device operates over –40°C to 85°C (I-grade), with thermal resistance θJA = 150°C/W.
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 (3–3.2V), and 5V/12V system rails without external regulators. |
| Output Current | Up to 450mA - sufficient for powering baseband processors, RF front-ends, or sensor subsystems in portable equipment. |
| Oscillator Frequency | 112–142kHz (typ 125kHz with 100pF COSC) - balances efficiency, EMI, and inductor size; not phase-lockable (LTC1433 variant). |
| Reference Accuracy | ±1% over temperature - ensures stable 3.3V/5V or adjustable output voltage under line/load transients and thermal drift. |
| Quiescent Current | 470µA in normal mode; 15µA in shutdown - extends battery life in always-on or sleep-wake applications. |
| Efficiency | Up to 93% at 3.3V out / 5V in - achieved via Adaptive Power switching and low-RDS(ON) P-FETs minimizing conduction loss. |
| Dropout Operation | 100% duty cycle enabled - maintains regulation down to VIN ≈ VOUT + ILOAD × RDS(ON), critical for low-voltage battery end-of-life. |
Pinout & Package
Package: 16-lead narrow SSOP (GN), RoHS-compliant, moisture-sensitive level 3. Thermal pad not present; θJA = 150°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SSW (Pin 1) | Drain of small P-channel MOSFET | Switches low-load currents (≤260mA peak); lower RDS(ON) reduces gate charge loss at light loads. |
| BSW (Pin 3) | Drain of large P-channel MOSFET | Engages with SSW under high load; combined RDS(ON) = 0.6Ω at 10V enables full 450mA output. |
| SGND (Pin 5) | Small-signal ground reference | Must be routed separately from PGND to VOSENSE/POR/LBO to avoid feedback loop noise injection. |
| RUN/SS (Pin 6) | Soft-start timing & enable control | Capacitor to ground sets ramp time (~0.5s/µF); <1.3V forces shutdown; clamped at 6V for >6V inputs. |
| LBO (Pin 7) | Open-drain low-battery alert output | Sinks current when LBI falls below 1.19V; requires external pull-up for logic-level signaling to host MCU. |
| LBI (Pin 8) | Low-battery comparator positive input | Monitors battery voltage against internal 1.19V reference; tied to ground with RUN/SS to disable comparator. |
| VPROG (Pin 9) | Output voltage programming select | 0V → 3.3V; VIN → 5V; open → adjustable via external resistor divider on VOSENSE. |
| VOSENSE (Pin 10) | Feedback voltage input | Connects to output (fixed) or divider midpoint (adjustable); error amplifier input referenced to 1.19V. |
| ITH (Pin 11) | Error amplifier compensation node | Controls peak current limit; voltage range 0–2.4V; external RC network stabilizes loop response. |
| POR (Pin 12) | Open-drain power-on reset output | Pulls low until output reaches within 5% of regulation, then releases after 65536 oscillator cycles (≈300ms). |
| COSC (Pin 13) | Oscillator timing capacitor connection | 100pF sets ~125kHz; frequency varies with capacitor value per fOSC = 8.4×10⁸/(COSC + 11) kHz. |
| SVIN (Pin 14) | Analog control circuit supply | Separate 3–13.5V rail powers internal logic, comparators, and error amp; decoupling required. |
| PGND (Pin 15) | Power switch driver ground | Return path for SSW/BSW switching currents; must connect close to CIN (–) and Schottky cathode. |
| PWRVIN (Pin 16) | Power MOSFET supply | High-current input for P-FET sources; requires low-ESR bulk capacitance near pin to suppress switching noise. |
| NC (Pins 2, 4) | No connection | Not internally bonded; leave unconnected and unpopulated on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Power switching | Automatically selects between small or dual P-FETs based on load current - improves light-load efficiency by up to 3% versus single-inductor designs. |
| Integrated low-battery detector | Shares same 1.19V reference as VOSENSE - eliminates calibration drift between output regulation and battery monitoring thresholds. |
| 100% duty-cycle dropout | Enables continuous regulation as input drops to VOUT + ILOAD × RDS(ON) - extends usable battery voltage range in handheld devices. |
| Power-on reset with programmable delay | 65536-cycle counter (≈300ms at 125kHz) ensures stable output before releasing POR - prevents premature MCU boot during brown-out recovery. |
| Separate SGND and PGND pins | Minimizes noise coupling from high di/dt switch node into sensitive analog feedback path - critical for ±1% output accuracy. |
Applications
| Portable Instrument Power Supply | RF Front-End Bias Rail |
|---|---|
|
Use Scenario: Powering precision ADCs, op-amps, and microcontrollers in handheld multimeters or data loggers with single Li-ion cell. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 3.3V from 3.0–4.2V battery; manages dynamic load steps during measurement bursts. Use Value: 93% peak efficiency and 470µA quiescent current maximize runtime; dropout operation sustains regulation down to 3.1V battery voltage. |
Use Scenario: Generating clean 3.3V bias for LNAs, mixers, and VCOs in cellular modems or wireless sensor nodes. IC Role / Device Role / Timing Role: Low-noise DC/DC converter supplying RF subsystem; SGND/PGND separation prevents switching noise from degrading SNR. Use Value: ±1% reference accuracy ensures consistent gain/linearity; low 15µA shutdown current enables fast wake-from-sleep transitions. |
| Battery-Powered Scanner Logic Rail | Distributed Power Node in Portable Equipment |
|
Use Scenario: Providing regulated 5V for CMOS image sensors and motor drivers in handheld barcode scanners. IC Role / Device Role / Timing Role: Fixed 5V output converter using VPROG = VIN; handles pulsed 400mA loads during scan activation. Use Value: Dual P-FET architecture delivers full 450mA without thermal derating; POR signal synchronizes scanner firmware initialization. |
Use Scenario: Local point-of-load conversion in multi-rail portable systems where centralized 12V bus feeds multiple LTC1433IGN#PBF units. IC Role / Device Role / Timing Role: Standalone buck converter with independent soft-start (RUN/SS) and fault signaling (LBO/POR) per subsystem. Use Value: Pin-selectable outputs (3.3V/5V/adjustable) simplify BOM across variants; 16-pin SSOP footprint eases layout in space-constrained enclosures. |
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, 300mA output, 2.05–6.5V input; smaller 6-pin WSON package; no LBO/POR; higher IQ (17µA shutdown). | Targeted at ultra-compact, high-frequency designs where size outweighs feature count; lacks battery monitoring and reset functions. | Select when board area is critical and system already implements discrete battery monitoring; not drop-in due to different pinout and missing LBO/POR. |
| MAX17503GCU+T | 4.5–60V input, 600mA output, 2.2MHz sync-capable; includes current sense, thermal shutdown, and enable; no integrated LBO. | Designed for industrial/high-voltage inputs; supports remote sensing and robust protection but requires external feedback resistors for all outputs. | Choose for wide-input applications (>13.5V) or where overcurrent protection is mandatory; incompatible pinout and higher minimum input voltage. |
Compared with TPS62231DRYR and MAX17503GCU+T, the LTC1433IGN#PBF uniquely combines integrated low-battery detection, power-on reset, and Adaptive Power switching in a 16-pin SSOP - making it optimal for battery-critical portable instruments where feature integration and thermal management outweigh ultra-high switching frequency needs.
Availability
LTC1433IGN#PBF is available at Aetrix Electronics and suitable for portable instruments, RF communications modules, and battery-powered equipment requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC1433IGN#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1433IGN#PBF belongs to Linear's legacy high-efficiency current-mode DC/DC converter family, designed specifically for battery-operated portable electronics demanding low quiescent current, accurate regulation, and intelligent power management features.
FAQ
What is the maximum output current capability of the LTC1433IGN#PBF?
The LTC1433IGN#PBF delivers up to 450mA of continuous output current under typical conditions (VIN ≥ 5V, TA = 25°C). This rating assumes proper thermal design with θJA = 150°C/W and adequate PCB copper area. At lower input voltages (e.g., 3.6V), maximum output current decreases due to reduced headroom and higher conduction losses - refer to Figure G05 in the datasheet for derating curves.
Does the LTC1433IGN#PBF support adjustable output voltage, and how is it configured?
Yes, the LTC1433IGN#PBF supports adjustable output voltage via the VPROG pin. When VPROG is left open (DC floating), the output is set by an external resistor divider connected to VOSENSE, enabling any voltage ≥1.19V per VOUT = 1.19V × (1 + R2/R1). Fixed 3.3V and 5V outputs are selected by pulling VPROG to ground or VIN respectively - no external resistors needed.
How does the Adaptive Power feature improve efficiency in the LTC1433IGN#PBF?
The Adaptive Power feature in the LTC1433IGN#PBF dynamically engages only the small P-channel MOSFET (SSW) at light loads (<260mA peak inductor current), reducing gate charge and switching losses. Under heavier loads, both SSW and BSW activate to deliver full 450mA. This dual-FET architecture improves light-load efficiency by up to 3% compared to single-switch converters, extending battery life in intermittent-use applications.
What is the function of the POR pin on the LTC1433IGN#PBF, and how is it used?
The POR (Power-On Reset) pin on the LTC1433IGN#PBF is an open-drain output that remains low until the output voltage reaches within 5% of its regulated value, then stays low for exactly 65536 oscillator cycles (≈300ms at 125kHz) before going high-impedance. An external pull-up resistor is required. This provides a reliable, oscillator-synchronized reset signal to microcontrollers, ensuring firmware initializes only after stable power is established.
Can the LTC1433IGN#PBF operate in dropout mode, and what happens to regulation?
Yes, the LTC1433IGN#PBF supports 100% duty-cycle dropout operation. As input voltage approaches the output voltage, the controller holds the P-channel MOSFETs fully on, causing VOUT = VIN − ILOAD × RDS(ON). Regulation degrades linearly with decreasing VIN, but the device continues supplying current without shutdown - critical for maintaining function during battery discharge down to ~3.1V for a 3.3V output.
LTC1433IGN#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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC1433IGN#PBF FAQ
1.How can I place an order for LTC1433IGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1433IGN#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 LTC1433IGN#PBF reliable?
The price and inventory of LTC1433IGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1433IGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC1433IGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1433IGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1433IGN#PBF?
LTC1433IGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1433IGN#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 LTC1433IGN#PBF?
For technical support, including LTC1433IGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1433IGN#PBF requirements.
6.How does Aetrix verify that LTC1433IGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1433IGN#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 LTC1433IGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC1433IGN#PBF?
All LTC1433IGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1433IGN#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 LTC1433IGN#PBF part is unused and in its original packaging.
Return procedure for LTC1433IGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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