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Analog Devices Inc. LTC3530EMS#PBF
- Part No.:
- LTC3530EMS#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC3530EMS#PBF.pdf
- Description:
- IC REG BUCK BST ADJ 600MA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,894
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Product details
Overview
LTC3530EMS#PBF from Analog Devices (formerly Linear Technology) is a wide-input synchronous buck-boost DC/DC converter IC designed for single-cell Li-ion, two-cell alkaline/NiMH battery-powered systems where input voltage may fall above, below, or equal to the regulated output. It delivers up to 600mA continuous output from Li-ion input, supports 1.8V–5.5V input and 1.8V–5.25V output ranges, operates up to 2MHz switching frequency, and achieves up to 96% efficiency via synchronous rectification.
For engineers reviewing the LTC3530EMS#PBF datasheet, LTC3530EMS#PBF pinout, LTC3530EMS#PBF application, or LTC3530EMS#PBF equivalent, this page provides verified technical context on its four-switch topology, programmable Burst Mode threshold, fixed-frequency vs Burst Mode quiescent current trade-offs (40μA typical in Burst Mode), thermal shutdown behavior, and MSOP-10 package-specific layout constraints including exposed-pad grounding requirements.
Technical Context
The LTC3530EMS#PBF implements a proprietary four-switch buck-boost topology with continuous transfer function across buck, buck-boost, and boost regions-enabling seamless mode transitions without output discontinuity. Its internal control voltage (VCI) determines switch pairing: A/D remain on during buck, C/D alternate during boost, and all four switches phase in/out during buck-boost region near VIN ≈ VOUT.
It integrates voltage-mode error amplification (90dB AVOL), programmable oscillator (300kHz–2MHz via RT resistor), automatic Burst Mode control (set by RBURST resistor), and dual current limiting: high-speed peak limit (2.5A typical) and closed-loop input current clamp (2A typical, folding back to 670mA during short-circuit). The VC pin serves as error amp output and is actively clamped during Burst Mode to prevent output transients on mode re-entry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports full discharge of single Li-ion (2.7–4.2V) and two-cell alkaline/NiMH (2.0–3.2V) |
| Output Voltage Range | 1.8V to 5.25V - adjustable via FB resistor divider; feedback reference = 1.215V ±24mV over temperature |
| Continuous Output Current | 600mA from Li-ion input - sufficient for digital camera sensors or GPS baseband processors |
| Switching Frequency | 300kHz to 2MHz - set externally via RT pin; higher frequencies reduce inductor/capacitor size but increase quiescent current |
| Burst Mode Quiescent Current | 40μA typical - extends battery life in standby; enters automatically when load drops below programmed threshold |
| Shutdown Current | <1μA - achieved by pulling SHDN/SS pin below 0.4V; enables true system-level power gating |
| Efficiency | Up to 96% - enabled by synchronous NMOS/PMOS switches with RDS(ON) = 0.21Ω / 0.24Ω and zero reverse-current conduction |
Pinout & Package
The LTC3530EMS#PBF is housed in a thermally enhanced 10-lead plastic MSOP package (3mm × 3mm footprint, 0.85mm height) with exposed pad (Pin 11 not present-DFN-only feature). Pin 1 is RT; Pin 5 is GND; Pin 10 is VC. All pins require strict adherence to recommended PCB layout: minimal trace length for SW1/SW2, ceramic bypass capacitors placed directly at VIN/GND and VOUT/GND, and GND plane connection under exposed pad (not applicable to MSOP).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RT (Pin 1) | Oscillator programming input | Resistor-to-GND sets switching frequency per f(kHz) = 33,170 / RT(kΩ); tolerance affects timing accuracy |
| BURST (Pin 2) | Automatic Burst Mode threshold control | Resistor-to-GND programs load-current transition point between Burst and PWM modes; capacitor required for filtering |
| SW1 (Pin 3) | Internal switch node A/B connection | Connects to one end of power inductor; optional Schottky diode to GND improves light-load efficiency |
| SW2 (Pin 4) | Internal switch node C/D connection | Connects to other end of inductor; Schottky diode to VOUT required if VOUT > 4.3V to clamp voltage overshoot |
| GND (Pin 5) | Power and signal ground reference | Mandatory low-impedance connection to PCB ground plane; critical for thermal dissipation and noise immunity |
| VOUT (Pin 6) | Regulated output supply rail | Delivers final DC output; requires ≥22μF X5R ceramic capacitor placed adjacent to pin for ripple suppression |
| VIN (Pin 7) | Main input supply and internal VCC source | Accepts 1.8–5.5V input; requires ≥10μF low-ESR ceramic capacitor directly at pin for stability |
| SHDN/SS (Pin 8) | Combined shutdown and soft-start control | <0.4V disables IC; >1.6V ensures full enablement and unclamped VC; RC network enables controlled ramp-up |
| FB (Pin 9) | Feedback voltage sensing input | Monitors resistor divider output; 1.215V reference enables precise output regulation across full temperature range |
| VC (Pin 10) | Error amplifier output | Drives compensation network (FB→VC); clamped internally during Burst Mode to prevent output transients |
Key Features
| Feature | Design Value |
|---|---|
| Four-switch synchronous buck-boost topology | Enables continuous regulation across VIN > VOUT (buck), VIN < VOUT (boost), and VIN ≈ VOUT (buck-boost) without mode-hopping artifacts |
| Programmable automatic Burst Mode operation | Reduces quiescent current to 40μA at light loads while maintaining regulation; transition threshold set by single external resistor |
| Output disconnect in shutdown | Prevents reverse current flow from VOUT to VIN during disable, protecting upstream battery or power source |
| Thermal shutdown and current limiting | Protects against sustained overload: 125°C junction limit, 2.5A peak switch current clamp, and foldback to 670mA during short-circuit |
| Pin compatibility with LTC3440 | Enables drop-in upgrade path from legacy buck-boost IC with added Burst Mode, extended voltage range, and improved efficiency |
Applications
| Digital Cameras | Smart Phones |
|---|---|
Use Scenario: Powering image sensor and ISP core requiring stable 3.3V from depleting Li-ion battery (2.8–4.2V). IC Role / Device Role / Timing Role: Primary buck-boost regulator delivering regulated VDDIO and AVDD rails with seamless transition as battery discharges below 3.3V. Use Value: Maintains consistent sensor performance and color fidelity across full battery cycle without brownouts or manual rail switching. | Use Scenario: Supplying application processor I/O voltage (1.8V) from shared battery rail subject to dynamic load steps. IC Role / Device Role / Timing Role: Secondary power rail generator supporting variable-core-voltage logic domains with fast transient response. Use Value: Enables aggressive DVFS schemes by sustaining 600mA peak current during CPU burst while minimizing idle power loss. |
| Portable GPS Units | Handheld Instruments |
Use Scenario: Providing clean 3.0V supply to RF front-end and baseband ICs in battery-operated navigation devices. IC Role / Device Role / Timing Role: Low-noise, high-efficiency DC/DC converter operating in fixed-frequency mode to avoid interference with GPS L1 band (1.575GHz). Use Value: Delivers 96% efficiency at 500mA while suppressing switching harmonics that could desensitize GNSS receiver. | Use Scenario: Regulating 5.0V analog front-end supply from two AA alkaline cells (1.8–3.2V) in portable multimeters or data loggers. IC Role / Device Role / Timing Role: Wide-input buck-boost converter enabling single-battery operation across full cell voltage range without voltage-doubler complexity. Use Value: Eliminates need for discrete charge-pump or transformer-based solutions, reducing BOM count and EMI emissions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3440EMS#PBF | Lacks programmable Burst Mode; narrower input range (2.5–5.5V); no automatic mode transition; lower max output current (400mA) | Suitable only for fixed-VIN systems where battery voltage stays above 2.5V; cannot support deep-discharge Li-ion or dual-alkaline use cases | Select LTC3440EMS#PBF only when Burst Mode is unnecessary and input never drops below 2.5V. |
| TPS63020DSJR | Higher max output current (900mA); integrated compensation; no separate RT/BURST pins; different pinout; 2.5–5.5V input range | Requires PCB redesign due to non-pin-compatible layout; better suited for high-current, space-constrained designs where external component count must be minimized | Choose TPS63020DSJR when board area is critical and load exceeds 600mA, accepting layout change and vendor transition. |
Compared with LTC3440EMS#PBF, the LTC3530EMS#PBF adds programmable Burst Mode and extends input down to 1.8V-enabling true single-cell alkaline/NiMH support. Against TPS63020DSJR, it offers superior light-load efficiency control via dedicated BURST pin but requires more external components and has lower peak current capability.
Availability
LTC3530EMS#PBF is available at Aetrix Electronics and suitable for portable medical monitors, handheld test equipment, and battery-powered IoT edge nodes requiring stable component supply with guaranteed long-term availability and full RoHS compliance.
Supply support for LTC3530EMS#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 full product support, documentation, and manufacturing continuity for all Linear DC/DC converter families.
The LTC3530EMS#PBF belongs to Linear's high-efficiency buck-boost converter product line, engineered specifically for battery-powered portable electronics where input voltage varies across the output setpoint and ultra-low quiescent current is mandatory.
FAQ
What is the maximum continuous output current specification for the LTC3530EMS#PBF?
The LTC3530EMS#PBF delivers 600mA continuous output current when powered from a Li-ion source (e.g., 3.6V nominal). At lower input voltages such as 1.8V, the continuous output current is reduced to 250mA due to internal current limiting and switch RDS(ON) constraints. Peak current capability remains 1A, but sustained operation above 600mA risks thermal shutdown unless board-level thermal design exceeds θJA = 120°C/W.
How does the LTC3530EMS#PBF implement automatic Burst Mode operation?
The LTC3530EMS#PBF uses the BURST pin to sense load-dependent current threshold via an external resistor to GND. When output load falls below IBURST = 8.8/RBURST (kΩ) amps, the IC enters Burst Mode-delivering energy bursts then sleeping to achieve 40μA typical quiescent current. Exit occurs at 11.2/RBURST amps. A parallel capacitor filters noise and prevents false triggering during transients.
Can the LTC3530EMS#PBF operate with an output voltage below 1.8V?
Yes-the LTC3530EMS#PBF can regulate down to 0.4V using external feedback resistors, but Burst Mode is disabled below 1V output, and the current limit folds back to 670mA typical. For VOUT < 1.8V, a Schottky diode from SW2 to VOUT is mandatory to maintain conduction path, as synchronous switch D's RDS(ON) increases significantly at low VGS.
What are the thermal limitations of the LTC3530EMS#PBF in MSOP package?
The LTC3530EMS#PBF in MSOP package has θJA = 120°C/W and maximum junction temperature of 125°C. With 600mA load at 3.3V output and 3.6V input, power dissipation is ~180mW; ambient temperature must stay below 105°C to avoid thermal shutdown. PCB copper area under the package body and thermal vias to inner ground planes are essential to maintain safe operation.
Is the LTC3530EMS#PBF pin-compatible with the LTC3440EMS#PBF?
Yes-the LTC3530EMS#PBF is fully pin-compatible with the LTC3440EMS#PBF in the same MSOP-10 package, sharing identical pin functions and layout. This allows direct replacement to add programmable Burst Mode, extend input range to 1.8V, and increase output current capability without PCB revision.
LTC3530EMS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- 5.25V
- Current - Output:
- 600mA
- Frequency - Switching:
- 300kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LTC3530EMS#PBF FAQ
1.How can I place an order for LTC3530EMS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3530EMS#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 LTC3530EMS#PBF reliable?
The price and inventory of LTC3530EMS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3530EMS#PBF is usually 5 days.
3.What payment methods are accepted for LTC3530EMS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3530EMS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3530EMS#PBF?
LTC3530EMS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3530EMS#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 LTC3530EMS#PBF?
For technical support, including LTC3530EMS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3530EMS#PBF requirements.
6.How does Aetrix verify that LTC3530EMS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3530EMS#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 LTC3530EMS#PBF meets industry standards.
7.What is the process for return or replacement of LTC3530EMS#PBF?
All LTC3530EMS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3530EMS#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 LTC3530EMS#PBF part is unused and in its original packaging.
Return procedure for LTC3530EMS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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