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Analog Devices Inc. LTC3600IMSE#PBF
- Part No.:
- LTC3600IMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3600IMSE#PBF.pdf
- Description:
- IC REG BUCK PROG 1.5A 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,594
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Product details
Overview
LTC3600IMSE#PBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC regulator with single-resistor output voltage programming, 1.5A output current capability, and adjustable switching frequency from 200kHz to 4MHz. It operates from 4V to 15V input, delivers rail-to-rail VOUT (0V to VIN – 0.5V), and features ±1% ISET current accuracy for precise regulation in point-of-load power supplies.
For engineers reviewing the LTC3600IMSE#PBF datasheet, LTC3600IMSE#PBF pinout, LTC3600IMSE#PBF application, or LTC3600IMSE#PBF equivalent, key selection considerations include its constant-on-time architecture for fast transient response, internal 5V INTVCC LDO, 12-pin MSOP package with exposed thermal pad, and support for external synchronization or internal compensation via ITH pin.
Technical Context
The LTC3600IMSE#PBF implements current-mode control with an accurate 50µA ISET current source enabling unity-gain VOUT feedback. Its constant-on-time architecture ensures stable high-frequency operation even at high step-down ratios, while valley-current sensing via the bottom MOSFET enables discontinuous conduction mode (DCM) at light loads.
Switching frequency is programmable via RT pin (200kHz–4MHz) or synchronized externally via MODE/SYNC pin within ±30% range. The device integrates top/bottom NMOS power switches (200mΩ/100mΩ RDS(ON)), a 5V INTVCC LDO, and overvoltage/undervoltage protection on PGFB with open-drain PGOOD output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 15V - supports dual Li-ion battery, 5V, and 12V input rails without external regulators. |
| IOUT Max | 1.5A - sufficient for FPGA core, microprocessor I/O, or ASIC auxiliary rails in compact designs. |
| fSW Range | 200kHz to 4MHz - enables use of sub-3mm inductors; 1MHz default when RT tied to INTVCC. |
| ISET Accuracy | ±1% (49.5µA to 50.5µA) - ensures tight output voltage tolerance independent of VOUT setting. |
| Efficiency | Up to 96% - achieved at mid-load with low RDS(ON) integrated FETs and optimized gate drive. |
| Shutdown IQ | 1.5µA - enables ultra-low-power standby in portable instruments and battery-backed systems. |
| Junction Temp | –40°C to 125°C - rated for industrial and automotive under-hood environments with proper PCB thermal design. |
Pinout & Package
Package: 12-lead plastic MSOP with exposed GND pad (Pin 13), 3mm × 3mm footprint, θJA = 43°C/W. Exposed pad must be soldered to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISET (1) | Programmable reference current source | 50µA sink; sets VOUT = RSET × 50µA; also enables soft-start with CSET. |
| ITH (2) | Error amplifier output / compensation node | Drives current comparator threshold; tie to INTVCC for internal 100k+50pF compensation. |
| RT (3) | Frequency programming input | Resistor to GND sets fSW (200kHz–4MHz); floating or incorrect value causes undefined frequency. |
| PGFB (4) | Power good feedback divider input | Detects VOUT regulation window (0.555V–0.645V); open-drain PGOOD asserts when in window. |
| RUN (5) | Enable/shutdown control | <1V = shutdown; 1.55V–12V = active; <0.4V = full chip disable with zero supply current. |
| MODE/SYNC (6) | Operation mode or sync clock input | GND = DCM; INTVCC = forced CCM; external clock = sync within ±30% of RT-set frequency. |
| SW (7) | Switch node | Connects to inductor; swings from ~–0.3V to VIN; requires low-inductance layout and ceramic bootstrap cap. |
| VIN (8) | Main input supply | 4V–15V; decouple with ≥22µF ceramic capacitor placed adjacent to pin. |
| BOOST (9) | Bootstrap supply for top FET gate driver | Swings up to VIN + INTVCC; requires 0.1µF ceramic cap between BOOST and SW. |
| INTVCC (10) | Internal 5V LDO output | Powers gate drivers and bias circuits; bypass with ≥1µF low-ESR ceramic to GND. |
| VOUT (11) | Regulated output | Unity-gain follower of ISET; negative EA input; connects directly to load and output capacitor. |
| PGOOD (12) | Open-drain power-good indicator | Pulled low if PGFB outside 7.5% window; 20µs blanking prevents false triggers during transients. |
| GND (13) | Power and signal ground (exposed pad) | Return path for both power FETs and analog circuitry; must be soldered to large PCB copper area. |
Key Features
| Feature | Design Value |
|---|---|
| Single-resistor VOUT programming | Eliminates feedback divider; reduces BOM count and layout sensitivity while maintaining ±1% accuracy. |
| Constant-on-time architecture | Enables stable 4MHz operation with fast load transient response (<10µs recovery) without loop compensation tuning. |
| Adjustable DCM/CCM operation | MODE/SYNC pin selects discontinuous mode for light-load efficiency or forced continuous mode for ripple reduction. |
| Integrated 5V INTVCC LDO | Supplies gate drivers and analog circuitry; eliminates need for external bias rail and simplifies system power tree. |
| Thermally enhanced MSOP package | 12-lead MSOP with exposed GND pad achieves 43°C/W θJA, enabling 1.5A operation without heatsink at 25°C ambient. |
Applications
| Voltage Tracking Supplies | Point-of-Load Power Supplies |
|---|---|
Use Scenario: Sequencing multiple rails (e.g., core and I/O) in FPGAs or SoCs where VOUT must ramp in lockstep. IC Role / Device Role / Timing Role: LTC3600IMSE#PBF acts as slave regulator with ISET driven by master rail's voltage divider, enabling precise tracking within ±1%. Use Value: Eliminates dedicated tracking ICs and external op-amps; reduces board space and component count while ensuring safe power-up sequencing. |
Use Scenario: Providing clean, regulated 1.2V/1.8V/3.3V rails directly adjacent to microcontrollers or sensors on dense PCBs. IC Role / Device Role / Timing Role: LTC3600IMSE#PBF serves as compact, high-efficiency buck converter with integrated FETs and minimal external components. Use Value: Achieves >94% efficiency at 1A with 2.2µH inductor and ceramic caps, reducing thermal stress and enabling 2-layer board layouts. |
| Portable Instruments | Distributed Power Systems |
Use Scenario: Battery-powered handheld test equipment requiring low-noise, low-quiescent-current power for analog front-ends. IC Role / Device Role / Timing Role: LTC3600IMSE#PBF operates in DCM at light loads and shuts down fully (1.5µA IQ) when idle, extending battery life. Use Value: Delivers <10mVPP output ripple and 20µs transient recovery, preserving measurement accuracy in sensitive ADC/DAC paths. |
Use Scenario: Modular industrial controllers with distributed 5V/3.3V rails across backplane-connected boards. IC Role / Device Role / Timing Role: LTC3600IMSE#PBF provides local regulation with external clock sync (via MODE/SYNC) to eliminate beat frequencies between modules. Use Value: Synchronization reduces EMI peaks and simplifies EMC filtering; 12-pin MSOP allows placement near connectors or slots. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8610EMSE#PBF | Higher VIN max (42V), lower IQ (2.5µA), but requires feedback divider; no single-resistor programming. | Better suited for automotive 12V/24V inputs; lacks ISET-based soft-start and tracking simplicity. | Select when input exceeds 15V or ultra-low IQ in sleep mode is critical; accept added resistor network complexity. |
| TPS54331DR | Fixed 500kHz fSW, no external sync, 3.5A rating, but only ±2% VREF accuracy and no ISET current source. | Higher current for cost-sensitive industrial supplies; lacks precision programmability and thermal performance of MSOP package. | Choose for higher output current and lower BOM cost where ±2% VOUT tolerance and fixed frequency are acceptable. |
Compared with LT8610EMSE#PBF and TPS54331DR, the LTC3600IMSE#PBF uniquely combines single-resistor VOUT programming, ±1% ISET accuracy, and thermally optimized MSOP packaging-making it optimal for space-constrained, precision-tracking, and multi-rail portable or instrumentation designs where layout simplicity and regulation fidelity are prioritized over ultra-high input voltage or raw current headroom.
Availability
LTC3600IMSE#PBF is available at Aetrix Electronics and suitable for point-of-load power supplies, portable instrumentation, voltage tracking systems, and distributed power architectures requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across temperature.
Supply support for LTC3600IMSE#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 its legacy of high-performance power management ICs with rigorous characterization and industrial-grade reliability.
The LTC3600IMSE#PBF belongs to Linear's monolithic synchronous buck regulator product line, designed specifically for compact, high-efficiency, and easily configurable DC/DC conversion in space- and precision-sensitive applications.
FAQ
What is the function of the ISET pin on the LTC3600IMSE#PBF?
The ISET pin on the LTC3600IMSE#PBF sources a highly accurate 50µA current that sets the output voltage via a single external resistor (VOUT = RSET × 50µA). It also serves as the positive input to the error amplifier and enables soft-start when a capacitor is connected to ground. Driving ISET directly with an external voltage source (0V to VIN) is supported, provided the source can sink 50µA. Floating or overvoltage on ISET must be avoided to prevent malfunction.
Can the LTC3600IMSE#PBF operate with an input voltage below 4V?
No, the LTC3600IMSE#PBF has a specified minimum input voltage of 4V per its Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 4V is not guaranteed and may result in failure to regulate, unstable switching, or undervoltage lockout activation. For sub-4V applications, alternative regulators such as the LTC3630 or TPS62130 should be evaluated.
How does the MODE/SYNC pin affect operation of the LTC3600IMSE#PBF?
The MODE/SYNC pin on the LTC3600IMSE#PBF determines operating mode: tied to GND enables discontinuous conduction mode (DCM) at light loads for higher efficiency; tied to INTVCC forces continuous conduction mode (CCM) regardless of load; applying an external clock signal synchronizes switching frequency within ±30% of the RT-programmed value. Incorrect biasing (e.g., floating) may cause erratic behavior or failure to start.
What is the purpose of the exposed pad (Pin 13) on the LTC3600IMSE#PBF MSOP package?
The exposed pad (Pin 13) on the LTC3600IMSE#PBF is electrically and thermally connected to GND and must be soldered to a PCB copper pour for optimal thermal dissipation and electrical performance. With θJA = 43°C/W, proper pad connection is essential to maintain junction temperature ≤125°C at 1.5A load and 25°C ambient. Leaving it unconnected degrades thermal performance by >20°C/W and risks reliability failure.
Does the LTC3600IMSE#PBF support output voltage tracking, and how is it implemented?
Yes, the LTC3600IMSE#PBF supports precise output voltage tracking by driving the ISET pin with a voltage derived from another regulator's output (e.g., via resistor divider). Since VOUT follows ISET in unity gain, tracking accuracy depends on ISET current source accuracy (±1%) and divider matching. This eliminates external op-amps or dedicated tracking ICs, enabling compact, low-component-count sequencing for FPGAs or multi-rail processors.
LTC3600IMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 0V
- Voltage - Output (Max):
- 14.5V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LTC3600IMSE#PBF FAQ
1.How can I place an order for LTC3600IMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3600IMSE#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 LTC3600IMSE#PBF reliable?
The price and inventory of LTC3600IMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3600IMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3600IMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3600IMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3600IMSE#PBF?
LTC3600IMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3600IMSE#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 LTC3600IMSE#PBF?
For technical support, including LTC3600IMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3600IMSE#PBF requirements.
6.How does Aetrix verify that LTC3600IMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3600IMSE#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 LTC3600IMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3600IMSE#PBF?
All LTC3600IMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3600IMSE#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 LTC3600IMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3600IMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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