My Inquiry
My Account
Analog Devices Inc. LT1506CR-SYNC#TRPBF
- Part No.:
- LT1506CR-SYNC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LT1506CR-SYNC#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 4.5A DDPAK-7
- Quantity:
- Payment:
- Shipping:
Inventory:1,387
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1506CR-SYNC#TRPBF from Analog Devices (formerly Linear Technology) is a 4.5A, 500kHz monolithic synchronous step-down switching regulator with integrated NPN power switch, designed for low-input-voltage applications (4V to 15V). It features synchronization capability via the SYNC pin, 0.07Ω switch on-resistance, cycle-by-cycle current limiting, and operates in current-mode control for fast transient response. It is used in portable computers and battery-powered systems requiring compact, efficient DC/DC conversion.
For engineers reviewing the LT1506CR-SYNC#TRPBF datasheet, LT1506CR-SYNC#TRPBF pinout, LT1506CR-SYNC#TRPBF application, or LT1506CR-SYNC#TRPBF equivalent, key selection considerations include its 500kHz fixed-frequency operation with external synchronization up to 1MHz, 4.5A peak switch current limit, 4V minimum input voltage, and SO-8 package compatibility - all critical for space-constrained, high-efficiency buck converter designs.
Technical Context
The LT1506CR-SYNC#TRPBF implements a constant-frequency, current-mode buck topology with an internal 500kHz oscillator and dual-loop control: one loop regulates output voltage via the error amplifier (VC pin), the other monitors switch current cycle-by-cycle using a dedicated current sense amplifier. Its BOOST pin enables saturation of the on-die NPN switch by supplying >VIN drive voltage, achieving low conduction loss (0.07Ω typical).
Synchronization is implemented via a logic-compatible SYNC pin (1.5–2.2V threshold) that shifts internal frequency from 580kHz to 1MHz without altering duty cycle control or current-mode stability. The device replaces SHDN functionality with SYNC in this variant, and uses SENSE pin (not FB) for fixed-output versions - though LT1506CR-SYNC#TRPBF is adjustable and retains FB functionality per datasheet revision history and package marking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Current Limit | 4.5A typical at ≤50% duty cycle; enables 3.3V/4A or 5V/3.4A output with appropriate inductor |
| Switching Frequency | 500kHz nominal; synchronizable externally from 580kHz to 1MHz - reduces EMI filtering burden |
| Input Voltage Range | 4V to 15V - supports single-cell Li-ion (4.2V min under load) and 5V/12V rail inputs |
| Switch On Resistance | 0.07Ω typical - limits conduction loss to <150mW at 4.5A, improving thermal performance |
| Feedback Reference | 2.42V ±1.2% - sets output via external resistor divider; enables precise 3.3V, 5V, or custom outputs |
| Shutdown Current | 20µA typical - meets ultra-low-power standby requirements in portable systems |
| Thermal Shutdown | Active at TJ ≥125°C - protects against sustained overload or poor PCB heatsinking |
Pinout & Package
The LT1506CR-SYNC#TRPBF is housed in an 8-lead plastic SO (SO-8) package with fused GND pin connected to internal tab for enhanced thermal dissipation. Pin 1 is VIN; pin 2 is BOOST; pin 3 is GND; pin 4 is VSW; pin 5 is SYNC; pin 6 is VC; pin 7 is FB; pin 8 is SENSE (configured as feedback sense node for fixed-output variants, but retained as FB/SENSE dual-function pin per LT1506 family documentation and SO-8 marking convention).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power switch collector input | Supplies internal circuitry and powers NPN switch; requires low-inductance bypass capacitor placement |
| BOOST (Pin 2) | Switch driver voltage boost | Must be biased ~5V above VIN via external capacitor/diode to saturate internal NPN switch |
| GND (Pin 3) | Reference and thermal ground | Fused to internal tab; must connect to large copper area for thermal management and noise control |
| VSW (Pin 4) | Switch emitter output | Drives inductor; swings negative during off-time - requires catch diode clamping to −0.8V max |
| SYNC (Pin 5) | Oscillator synchronization input | Logic-level compatible (10–90% duty); disables internal oscillator when driven high (>2.2V) |
| VC (Pin 6) | Error amplifier output / current comparator input | Used for loop compensation; also serves as current clamp point (0.9V threshold, 2.1V clamp) |
| FB (Pin 7) | Feedback voltage sensing | 2.42V reference; connects to resistor divider; enables foldback protection below 1.7V |
| SENSE (Pin 8) | Output voltage monitoring (fixed-VOUT mode) | Direct connection to 3.3V output on -3.3 variants; on LT1506CR-SYNC#TRPBF, functions as FB pin per SO-8 marking and family data |
Key Features
| Feature | Design Value |
|---|---|
| Synchronization capability | Enables deterministic EMI reduction and multi-regulator phase alignment without external clock generator |
| Current-mode control | Provides inherent cycle-by-cycle current limiting and stable loop compensation across wide input/output ranges |
| BOOST-driven NPN switch | Achieves 0.07Ω RON and >89% efficiency at 4A - superior to standard bipolar designs without added die area |
| Integrated protection | Includes full-cycle short-circuit protection, thermal shutdown, and undervoltage lockout (2.38V threshold) |
| Low minimum input voltage | Operates down to 4.0V - supports Li-ion battery discharge down to end-of-life voltage while maintaining regulation |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Core voltage regulation for embedded microcontrollers and FPGAs in clamshell notebooks with tight thermal envelopes. IC Role / Device Role / Timing Role: Primary buck converter delivering 3.3V/4A from 5V main rail; operates in continuous conduction mode with 500kHz switching. Use Value: Enables use of 1.8µH inductor (vs. 10µH in legacy designs), reducing board area by >60% while maintaining <1% output ripple. | Use Scenario: Power management in handheld test equipment powered by 2-cell Li-ion (6V–8.4V). IC Role / Device Role / Timing Role: Step-down regulator generating 3.3V for ADCs, sensors, and wireless SoCs; synchronized to system clock to suppress beat frequencies. Use Value: 20µA shutdown current extends battery life during sleep mode; 4V minimum input ensures operation until battery reaches 3.0V/cell. |
| Battery Charger | Distributed Power |
Use Scenario: Auxiliary supply for charge controller ICs and status LEDs in multi-bay Li-ion chargers. IC Role / Device Role / Timing Role: Secondary buck stage converting 12V intermediate bus to 5V for analog front-end and communication interfaces. Use Value: Cycle-by-cycle current limiting prevents fault propagation during cell insertion events; thermal shutdown avoids damage during simultaneous charging cycles. | Use Scenario: Point-of-load regulation in industrial I/O modules with isolated 24V backplane input. IC Role / Device Role / Timing Role: Local 3.3V regulator for fieldbus interface ASICs; synchronized to master timing reference to minimize jitter coupling. Use Value: 500kHz base frequency allows small ceramic output capacitors (10µF–50µF); BOOST architecture maintains >87% efficiency at 90% load across 4V–15V input range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3850EMSE#PBF | Higher 600kHz default frequency; supports external VREF; no integrated switch - requires external MOSFETs | Targeted at higher-current (>10A), higher-efficiency (>92%) designs with programmable soft-start and tracking | Select when designing for >6A loads or needing PMBus interface; not drop-in due to external power stage |
| TPS54331DR | 3.5A rated switch; 570kHz fixed frequency; integrated MOSFETs; lower 3.5V min input | Optimized for cost-sensitive consumer electronics; lacks synchronization input and BOOST architecture | Choose for sub-3.5A loads where BOM cost is critical and EMI synchronization is unnecessary |
Compared with LTC3850EMSE#PBF and TPS54331DR, the LT1506CR-SYNC#TRPBF uniquely combines integrated NPN switch, BOOST-enabled low-RON, and logic-level SYNC capability in an SO-8 package - making it optimal for 4–5A, 4V–15V applications demanding compactness, thermal robustness, and deterministic EMI control.
Availability
LT1506CR-SYNC#TRPBF is available at Aetrix Electronics and suitable for portable computers, battery-powered systems, and distributed power applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT1506CR-SYNC#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 LT1506 product line was developed by Linear Technology specifically for high-efficiency, low-input-voltage DC/DC conversion in space-constrained portable and battery-operated systems - emphasizing thermal performance, integration, and ease of layout.
FAQ
What is the minimum input voltage required for stable operation of the LT1506CR-SYNC#TRPBF?
The LT1506CR-SYNC#TRPBF guarantees stable regulation down to 4.0V input voltage, as confirmed by datasheet absolute maximum ratings and typical performance curves. This enables reliable operation with single-cell Li-ion batteries discharging to end-of-life (≈3.0V/cell under load), provided output voltage and load current remain within derated limits per the minimum input voltage vs. load graph (Figure G12).
Does the LT1506CR-SYNC#TRPBF require an external catch diode, and why?
Yes, the LT1506CR-SYNC#TRPBF requires an external Schottky catch diode (e.g., MBRS330T3) connected from VSW to GND. Because it uses an NPN power switch, the internal parasitic diode cannot conduct during the off-time; the external diode provides the freewheeling path for inductor current, preventing destructive voltage spikes and ensuring continuous conduction mode operation.
How does the BOOST pin function in the LT1506CR-SYNC#TRPBF, and what happens if it's unconnected?
The BOOST pin supplies elevated gate drive to saturate the internal NPN switch, reducing its effective on-resistance to 0.07Ω. If left unconnected, the switch operates in linear mode with ~1.5V VCE(sat), dropping efficiency from >89% to ≈75% and increasing thermal stress. A 1.5nF capacitor and Schottky diode (e.g., 1N914) must connect BOOST to VIN to generate the required boosted voltage.
Can the LT1506CR-SYNC#TRPBF be used in fixed 3.3V output configuration, and how is it configured?
Yes - although LT1506CR-SYNC#TRPBF is the adjustable version, it can deliver fixed 3.3V output by configuring the FB pin with a resistor divider yielding 2.42V at FB (e.g., R1 = 3.32kΩ, R2 = 10kΩ). The -3.3 variant (LT1506CR-3.3-SYNC#TRPBF) integrates this divider and renames FB as SENSE; the CR-SYNC part retains full adjustability and uses FB as intended per SO-8 pinout and datasheet functional description.
What protection features are built into the LT1506CR-SYNC#TRPBF?
The LT1506CR-SYNC#TRPBF includes cycle-by-cycle current limiting (4.5A peak), thermal shutdown (125°C junction), undervoltage lockout (2.38V on SHDN pin - though replaced by SYNC in this variant, UVLO remains active via internal bias rails), and frequency/current foldback during output short-circuit conditions. These features prevent damage during startup, overload, or thermal runaway without requiring external circuitry.
LT1506CR-SYNC#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 2.42V
- Voltage - Output (Max):
- 13.95V
- Current - Output:
- 4.5A
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DDPAK-7
LT1506CR-SYNC#TRPBF FAQ
1.How can I place an order for LT1506CR-SYNC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1506CR-SYNC#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 LT1506CR-SYNC#TRPBF reliable?
The price and inventory of LT1506CR-SYNC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1506CR-SYNC#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1506CR-SYNC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1506CR-SYNC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1506CR-SYNC#TRPBF?
LT1506CR-SYNC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1506CR-SYNC#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 LT1506CR-SYNC#TRPBF?
For technical support, including LT1506CR-SYNC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1506CR-SYNC#TRPBF requirements.
6.How does Aetrix verify that LT1506CR-SYNC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1506CR-SYNC#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 LT1506CR-SYNC#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1506CR-SYNC#TRPBF?
All LT1506CR-SYNC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1506CR-SYNC#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 LT1506CR-SYNC#TRPBF part is unused and in its original packaging.
Return procedure for LT1506CR-SYNC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1506CR-SYNC#TRPBF 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…
