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Analog Devices Inc. LTC3600EMSE#PBF
- Part No.:
- LTC3600EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3600EMSE#PBF.pdf
- Description:
- IC REG BUCK PROG 1.5A 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,847
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Product details
Overview
LTC3600EMSE#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, supports rail-to-rail VOUT down to 0V (VIN – 0.5V), and delivers up to 96% efficiency in point-of-load power supplies for portable instruments and distributed systems.
For engineers reviewing the LTC3600EMSE#PBF datasheet, LTC3600EMSE#PBF pinout, LTC3600EMSE#PBF application, or LTC3600EMSE#PBF equivalent, key selection considerations include its ±1% ISET current accuracy, constant-on-time architecture for fast transient response, 12-pin MSOP package with exposed GND pad, and internal 5V INTVCC regulator supporting gate drive and bias circuits.
Technical Context
The LTC3600EMSE#PBF implements current-mode control with an accurate 50µA ISET current source enabling unity-gain VOUT programming via a single external resistor. Its constant-on-time architecture ensures stable high-frequency operation (up to 4MHz) even at high step-down ratios, while internal compensation (ITH tied to INTVCC) simplifies design versus OPTI-LOOP® external compensation.
It features dual-mode operation: discontinuous conduction mode (DCM) at light loads (MODE/SYNC = GND) and forced continuous conduction mode (CCM) when MODE/SYNC = INTVCC. Overvoltage (0.645V) and undervoltage (0.555V) detection on PGFB enables precise PGOOD monitoring with 20µs blanking delay to suppress transients.
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 LDO pre-regulation. |
| IOUT Max | 1.5A - sufficient for FPGA core, microcontroller, or ASIC point-of-load applications with margin. |
| fSW Range | 200kHz to 4MHz - enables compact magnetics (e.g., 2.2µH at 1MHz) and noise spectrum shaping. |
| ISET Accuracy | ±1% (49.5µA to 50.5µA) - ensures tight VOUT regulation independent of output voltage level. |
| Efficiency | Up to 96% - minimizes thermal load in thermally constrained MSOP-12 package (θJA = 43°C/W). |
| Shutdown IQ | 1.5µA - enables ultra-low-power system sleep states without external enable circuitry. |
| VOUT Range | 0V to VIN – 0.5V - supports zero-VOUT tracking, negative-bias generation (with external circuit), and wide-range programmability. |
Pinout & Package
Package: 12-lead plastic MSOP with exposed GND pad (Pin 13), rated for –40°C to 125°C junction temperature and θJA = 43°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISET (1) | Programmable reference current sink | 50µA sink sets VOUT = VISET; capacitor here enables soft-start; direct voltage drive possible (0–VIN). |
| ITH (2) | Error amplifier output / compensation node | Controls valley current threshold; tie to INTVCC for internal 100k+50pF compensation; external R/C for OPTI-LOOP® tuning. |
| RT (3) | Frequency programming input | Resistor to GND sets fSW (200kHz–4MHz); tie to INTVCC for fixed 1MHz; PLL tracks within ±30% during sync. |
| PGFB (4) | Power good feedback input | Resistor divider from VOUT sets PGOOD window (0.555V–0.645V); tie to INTVCC to disable PGOOD. |
| RUN (5) | Enable/shutdown control | >1.55V enables full operation; <1V disables switching; <0.4V shuts down entire IC including bias circuits. |
| MODE/SYNC (6) | Operation mode select / external clock input | GND = DCM; INTVCC = forced CCM; external clock synchronizes fSW within ±30% of RT-set frequency. |
| SW (7) | Switch node | Connects to inductor; swings from ~–0.3V to VIN; requires low-inductance layout to minimize ringing. |
| VIN (8) | Main power input | 4V–15V supply; must be decoupled with ≥22µF ceramic capacitor placed adjacent to pin. |
| BOOST (9) | Floating gate drive supply | Drives top MOSFET gate; connects to bootstrap capacitor (+) terminal; swings from INTVCC–0.3V to VIN+INTVCC. |
| INTVCC (10) | Internal 5V LDO output | Powers gate drivers and control logic; requires ≥1µF low-ESR ceramic bypass to GND; max 50mA RMS load. |
| VOUT (11) | Regulated output | Feedback node tied directly to error amp (–) input; equals VISET in closed loop; connects to output capacitor and load. |
| PGOOD (12) | Open-drain power-good indicator | Pulled low if PGFB outside 0.555V–0.645V window; 200Ω pull-down; requires external pull-up to INTVCC or other rail. |
| GND (13) | Power and signal ground | Exposed pad; must be soldered to PCB ground plane; serves as return path for both power MOSFETs and small-signal circuits. |
Key Features
| Feature | Design Value |
|---|---|
| Single-resistor VOUT programming | Eliminates feedback divider network - reduces BOM count, layout area, and resistor matching errors. |
| ±1% ISET current accuracy | Ensures ≤1% absolute VOUT error across temperature and line, independent of programmed output voltage. |
| Adjustable 200kHz–4MHz switching | Enables optimization for size (high fSW → small inductor/capacitor) or efficiency (low fSW → reduced switching loss). |
| Zero-current detection & DCM support | Improves light-load efficiency by disabling bottom FET when inductor current reaches zero. |
| Internal 5V INTVCC regulator | Removes need for external bias supply - simplifies design and improves reliability in multi-rail systems. |
| Thermally enhanced MSOP-12 | Exposed GND pad lowers thermal resistance (θJA = 43°C/W), enabling 1.5A operation without heatsink in standard PCB layouts. |
Applications
| Voltage Tracking Supplies | Point-of-Load Power Supplies |
|---|---|
Use Scenario: Sequencing multiple supply rails (e.g., core, I/O, memory) in FPGAs or SoCs where VOUT must ramp in sync with a master reference. IC Role / Device Role / Timing Role: LTC3600EMSE#PBF acts as a slave regulator whose ISET pin is driven by a DAC or another regulator's output, enabling precise voltage tracking. Use Value: Achieves <±1% tracking accuracy over temperature and load, eliminating need for dedicated tracking ICs or complex analog circuitry. | Use Scenario: Providing clean, regulated 1.2V/1.8V/3.3V power directly to processor cores or high-speed interfaces on dense PCBs. IC Role / Device Role / Timing Role: LTC3600EMSE#PBF serves as primary buck converter with integrated power switches, delivering 1.5A at up to 96% efficiency in minimal footprint. Use Value: Enables use of small 2.2µH inductors and 22µF ceramic output capacitors, reducing total solution size by >40% vs. lower-frequency alternatives. |
| Portable Instruments | Distributed Power Systems |
Use Scenario: Battery-powered handheld test equipment requiring low quiescent current, wide input range, and stable output under dynamic load steps. IC Role / Device Role / Timing Role: LTC3600EMSE#PBF functions as main system regulator, leveraging shutdown IQ = 1.5µA and fast transient response (<20µs recovery from 0.1A→1A step). Use Value: Extends battery life in sleep mode while maintaining rapid wake-up capability and minimal output droop during sensor acquisition bursts. | Use Scenario: Rack-mounted telecom or industrial modules needing isolated, independently regulated rails from a common 12V backplane. IC Role / Device Role / Timing Role: LTC3600EMSE#PBF operates as standalone POL converter per board, with RUN pin enabling centralized power sequencing and fault isolation. Use Value: Supports hot-swap compatibility via controlled start-up (soft-start via ISET capacitor) and robust VIN overvoltage protection (17.5V lockout). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54302DDAR | Fixed 500kHz fSW; no ISET programming - uses traditional resistive divider; 3.5V–28V VIN; 3A output. | Higher current, wider VIN, but lacks single-resistor simplicity and rail-to-rail VOUT range. | Select when higher output current or extended input voltage is required, and divider-based feedback is acceptable. |
| MP2315GJ-Z | Fixed 500kHz fSW; 4.5V–28V VIN; 1.5A; no ISET pin - uses standard feedback resistors; no PGOOD or SYNC. | Lower cost, smaller TSOT23-8 package, but missing precision tracking, soft-start control, and external sync capability. | Select for cost-sensitive, space-constrained designs where advanced features like ISET programming and PGOOD are not needed. |
Compared with TPS54302DDAR and MP2315GJ-Z, the LTC3600EMSE#PBF uniquely combines single-resistor VOUT programming, rail-to-rail output range (0V to VIN–0.5V), and ±1% ISET accuracy - making it optimal for precision tracking, low-voltage bias generation, and applications demanding minimal external components without sacrificing performance.
Availability
LTC3600EMSE#PBF is available at Aetrix Electronics and suitable for voltage tracking supplies, point-of-load power supplies, and portable instrument designs requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LTC3600EMSE#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3600 product line was designed specifically for high-efficiency, low-component-count DC/DC conversion in space- and thermal-constrained applications - emphasizing simplicity (single-resistor VOUT), precision (±1% ISET), and flexibility (200kHz–4MHz fSW, DCM/CCM mode control).
FAQ
What is the maximum output current supported by the LTC3600EMSE#PBF?
The LTC3600EMSE#PBF is rated for a continuous output current of 1.5A under typical thermal conditions using the MSOP-12 package with proper PCB copper pour. Its current limit is specified at 1.6A to 2.4A (typical 2A), providing headroom for short-term peak loads. Derating is required above 85°C ambient or with insufficient thermal relief on the exposed GND pad.
How does the ISET pin enable single-resistor output programming on the LTC3600EMSE#PBF?
The LTC3600EMSE#PBF integrates a highly accurate 50µA (±1%) current source connected to the ISET pin. Connecting a resistor RSET from ISET to GND sets VOUT = 50µA × RSET. Since the error amplifier forces VOUT to equal VISET, this creates a direct, linear relationship - eliminating feedback dividers and associated ratio errors. The LTC3600EMSE#PBF achieves rail-to-rail output from 0V to VIN – 0.5V using this method.
Can the LTC3600EMSE#PBF operate in discontinuous conduction mode (DCM), and how is it enabled?
Yes, the LTC3600EMSE#PBF supports DCM at light loads to improve efficiency. DCM is enabled by tying the MODE/SYNC pin to GND. In this mode, the bottom MOSFET turns off when inductor current reaches zero, and both switches remain off until the ITH voltage rises above ~0.8V. Forcing continuous conduction mode (CCM) regardless of load is achieved by tying MODE/SYNC to INTVCC.
What is the purpose of the exposed pad (Pin 13) on the LTC3600EMSE#PBF MSOP package?
The exposed pad (Pin 13) on the LTC3600EMSE#PBF is electrically and thermally connected to GND. It must be soldered to a PCB copper plane to provide low-impedance return paths for power MOSFET currents and to dissipate heat - reducing θJA from 43°C/W to near 30°C/W with adequate thermal vias. Failure to connect it degrades thermal performance and may cause premature thermal shutdown.
Does the LTC3600EMSE#PBF include overvoltage protection, and how does it function?
Yes, the LTC3600EMSE#PBF includes VIN overvoltage protection that activates when VIN exceeds 17.5V (rising) or 16V (falling). Upon detection, both power MOSFETs shut off, and the ISET pin is actively discharged to GND. Normal operation resumes automatically once VIN drops below 15V, with ISET recharging to its programmed voltage before switching restarts - protecting internal devices from transient spikes.
LTC3600EMSE#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
LTC3600EMSE#PBF FAQ
1.How can I place an order for LTC3600EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3600EMSE#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 LTC3600EMSE#PBF reliable?
The price and inventory of LTC3600EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3600EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3600EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3600EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3600EMSE#PBF?
LTC3600EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3600EMSE#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 LTC3600EMSE#PBF?
For technical support, including LTC3600EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3600EMSE#PBF requirements.
6.How does Aetrix verify that LTC3600EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3600EMSE#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 LTC3600EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3600EMSE#PBF?
All LTC3600EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3600EMSE#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 LTC3600EMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3600EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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