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Analog Devices Inc. LTC3530EMS#TRPBF
- Part No.:
- LTC3530EMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC3530EMS#TRPBF.pdf
- Description:
- IC REG BUCK BST ADJ 600MA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,565
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Product details
Overview
LTC3530EMS#TRPBF 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, and achieves up to 96% efficiency via synchronous rectification.
For engineers reviewing the LTC3530EMS#TRPBF datasheet, LTC3530EMS#TRPBF pinout, LTC3530EMS#TRPBF application, or LTC3530EMS#TRPBF equivalent, key selection considerations include programmable automatic Burst Mode threshold, 10-lead MSOP thermal performance (θJA = 120°C/W), fixed-frequency vs. Burst Mode quiescent current trade-offs (40μA vs. 700–1200μA), and four-switch topology behavior across buck/buck-boost/boost regions.
Technical Context
The LTC3530EMS#TRPBF implements a proprietary four-switch buck-boost topology with continuous transfer function across operating modes, enabling seamless transitions between buck (VIN > VOUT), buck-boost (VIN ≈ VOUT), and boost (VIN < VOUT) without output discontinuity. Internal control voltage (VCI) level-shifting determines switch pair activation-A/B in buck, C/D in boost, and phased A/C + B/D in four-switch region-with typical 150ns transition window.
It integrates voltage-mode error amplification (AVOL = 90dB), programmable oscillator (300kHz–2MHz via RT pin), dual current limiting (2A peak input clamp, 640mA reverse current limit), and active VC clamping during Burst Mode to suppress output transients on mode re-entry. Soft-start is implemented via SHDN/SS pin voltage ramping, with internal EA clamping until ≥1.6V is reached.
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 (1.8–3.2V) without external LDO pre-regulation. |
| Output Voltage Range | 1.8V to 5.25V - adjustable via FB resistor divider; feedback reference is 1.215V ±24mV over temperature. |
| Continuous Output Current | 600mA from Li-ion input - sufficient for core logic rails in portable GPS, digital cameras, and smart phones. |
| Switching Frequency | 300kHz to 2MHz - set by RT-to-GND resistor; higher frequencies reduce inductor/capacitor size but increase quiescent current. |
| Burst Mode Quiescent Current | 40μA typical - extends battery runtime at light loads (<10mA) while maintaining regulation. |
| Shutdown Current | <1μA - enables true system-level power gating in handheld instruments and MP3 players. |
| Synchronous Switch RDS(ON) | 0.21Ω (NMOS B/C) / 0.24Ω (PMOS A/D) - minimizes conduction loss and enables high-efficiency operation at 250mA–600mA load range. |
Pinout & Package
The LTC3530EMS#TRPBF is housed in a 10-lead plastic MSOP package (3mm × 3mm footprint, 1.1mm height) with exposed pad not present (unlike DFN variant). Thermal resistance is θJA = 120°C/W and θJC = 45°C/W. Pin 1 is RT; pin 10 is VC; pin 11 (exposed pad) is absent in MSOP.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RT (Pin 1) | Oscillator frequency programming input | Connects to GND via resistor to set switching frequency per f(kHz) = 33,170/RRT(kΩ); determines inductor/capacitor sizing and EMI profile. |
| BURST (Pin 2) | Automatic Burst Mode threshold control | Resistor-to-GND sets load-current thresholds for Burst Mode entry/exit (ILOAD = 8.8/RBURST and 11.2/RBURST kΩ); capacitor adds filtering for transient immunity. |
| 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 in buck mode. |
| SW2 (Pin 4) | Internal switch node C/D connection | Connects to other end of power inductor; Schottky diode to VOUT required if VOUT > 4.3V to clamp SW2 voltage overshoot. |
| GND (Pin 5) | Power and signal ground reference | Must be low-impedance connection to PCB ground plane; serves as return path for all internal switches and analog circuitry. |
| VOUT (Pin 6) | Regulated output voltage node | Delivers final DC output; requires local ceramic bypass (e.g., 22μF X5R) placed adjacent to pins to minimize ripple and EMI. |
| 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 stable internal bias and reduced input ripple. |
| SHDN/SS (Pin 8) | Combined shutdown and soft-start control | <0.4V disables IC; >1.4V enables; >1.6V releases EA clamping; RC network provides controlled VC ramp for inrush current limiting. |
| FB (Pin 9) | Feedback voltage sensing input | Monitors resistor divider output; regulates VOUT via 1.215V reference; Thevenin resistance >100kΩ recommended for effective current limiting. |
| VC (Pin 10) | Error amplifier output and loop compensation node | Drives internal gate drivers; external RC network (FB–VC) provides Type I or Type III compensation; actively clamped during Burst Mode. |
Key Features
| Feature | Design Value |
|---|---|
| Four-switch synchronous buck-boost topology | Enables continuous regulation across VIN/VOUT crossover without mode-hopping artifacts or output glitches - critical for battery-powered systems with decaying input voltage. |
| Programmable automatic Burst Mode | Reduces quiescent current to 40μA at light loads while maintaining regulation, improving battery life in standby or low-activity states (e.g., GPS tracking, audio playback pause). |
| 10-lead MSOP package with thermal enhancement | Provides 120°C/W junction-to-ambient thermal resistance - suitable for compact layouts in handheld instruments and digital cameras without forced airflow. |
| Integrated dual current limiting | Combines fast peak-current comparator (2.5A typical trip) and closed-loop input current clamp (2A typical) with foldback (670mA) during short-circuit or startup - protects against overload without external sense resistors. |
| Reverse current limiting | Shuts off switch D when inductor current reverses beyond 640mA - prevents energy backflow into input source during light-load boost operation. |
Applications
| Portable GPS Units | Digital Cameras |
|---|---|
Use Scenario: Powering GPS baseband processor and RF front-end from single Li-ion cell across full discharge cycle (4.2V → 2.7V) while maintaining stable 3.3V rail. IC Role / Device Role / Timing Role: Primary buck-boost regulator providing continuous, glitch-free 3.3V output regardless of input voltage crossing VOUT. Use Value: Eliminates need for separate buck + boost stages or low-efficiency linear regulators, reducing BOM count and extending field operational time by >15% versus fixed-frequency-only alternatives. | Use Scenario: Supplying image sensor, ISP, and LCD backlight driver from two-cell alkaline batteries (3.2V → 1.8V) with tight ripple requirements (<20mVpp) under dynamic load steps. IC Role / Device Role / Timing Role: High-efficiency synchronous regulator delivering 2.8V/500mA with programmable Burst Mode to manage idle current during viewfinder operation. Use Value: Achieves 92% efficiency at 100mA and 40μA quiescent current in Burst Mode - directly increases number of shots per battery set by minimizing standby drain. |
| Smart Phones | Handheld Instruments |
Use Scenario: Generating 1.8V core voltage for application processor from shared battery rail subject to rapid load transients (0→300mA in <100μs) during cellular transmission bursts. IC Role / Device Role / Timing Role: Fast-transient-response buck-boost converter with active VC clamping to suppress output droop during Burst-to-PWM mode transition. Use Value: Limits output deviation to <3% during 300mA step load with 22μF output capacitance - avoids processor brownout and maintains real-time communication integrity. | Use Scenario: Powering precision ADC, microcontroller, and display from two NiMH cells (2.4V → 1.8V) in battery-operated multimeter with 8-hour minimum runtime requirement. IC Role / Device Role / Timing Role: Low-noise, high-efficiency regulator supporting both active measurement (600mA peak) and sleep (10μA) modes via automatic Burst Mode. Use Value: Delivers 96% efficiency at 250mA and reduces average system current by 60% versus non-Burst alternatives - meets 8-hour runtime target with standard AA NiMH cells. |
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#TRPBF | Same 10-lead MSOP package and pinout, but lacks programmable Burst Mode and has narrower VIN range (2.5V–5.5V) and lower max output current (250mA). | Not suitable for Li-ion single-cell start-up below 2.5V or for loads exceeding 250mA; no automatic light-load efficiency optimization. | Select only if design operates strictly above 2.5V VIN and requires minimal feature set; LTC3530EMS#TRPBF offers superior battery utilization and higher current capability. |
| TPS63020DSJR | 3.0V–5.5V input, 1.2V–5.5V output, 2A continuous, but uses different control architecture (hysteretic) and lacks programmable Burst Mode threshold. | Higher current capability but less precise light-load efficiency control; no RT pin for frequency tuning; different compensation requirements. | Choose when peak current >600mA is required and fixed 2.5MHz operation is acceptable; LTC3530EMS#TRPBF preferred for designs needing fine-grained Burst Mode threshold adjustment and wider VIN coverage down to 1.8V. |
Compared with LTC3440EMS#TRPBF, LTC3530EMS#TRPBF extends usable battery range, adds programmable Burst Mode, and doubles output current; compared with TPS63020DSJR, it offers broader input compatibility, deterministic frequency control, and configurable light-load behavior - making it optimal for space-constrained, battery-life-critical portable electronics.
Availability
LTC3530EMS#TRPBF is available at Aetrix Electronics and suitable for portable GPS units, digital cameras, smart phones, handheld instruments, and miniature hard disk drive power requiring stable component supply across industrial temperature range (–40°C to +85°C) and long-term production continuity.
Supply support for LTC3530EMS#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, serving precision instrumentation, communications, and industrial markets.
The LTC3530EMS#TRPBF belongs to Linear's high-efficiency DC/DC converter product line, engineered specifically for battery-powered portable electronics demanding seamless voltage regulation across input voltage crossovers and ultra-low quiescent current in standby.
FAQ
What is the minimum input voltage required for LTC3530EMS#TRPBF to start up and regulate?
The LTC3530EMS#TRPBF has a guaranteed minimum start voltage of 1.78V at 25°C, with typical operation down to 1.8V across –40°C to +85°C. Startup is confirmed when VIN exceeds the internal undervoltage lockout threshold, allowing regulation even at deep battery discharge in single Li-ion or two-cell alkaline systems. This ensures reliable operation where competing converters require ≥2.5V.
How does the LTC3530EMS#TRPBF handle transitions between buck, buck-boost, and boost modes?
The LTC3530EMS#TRPBF uses an internal level-shifted control voltage (VCI) to phase internal switches A/B, C/D, and their combinations without interruption. At VIN ≈ VOUT, it enters a 150ns four-switch region where duty cycles shift continuously - eliminating output voltage glitches or regulation loss. This seamless transfer is verified in typical waveforms (Figures G09–G11) and is fundamental to its use in battery-powered systems with decaying input.
Can LTC3530EMS#TRPBF operate with output voltages below 1.8V?
Yes - the LTC3530EMS#TRPBF can regulate down to 0.4V in buck mode using external resistor divider, but Burst Mode is disabled below 1V and current limit drops to 670mA typical. A Schottky diode from SW2 to VOUT is mandatory for VOUT < 1.8V to ensure proper conduction path, as synchronous switch D's RDS(ON) rises significantly at low output voltages.
What is the purpose of the exposed pad in LTC3530EMS#TRPBF packages?
The LTC3530EMS#TRPBF uses a 10-lead MSOP package without an exposed pad; exposed pad (Pin 11) is only present in the DFN variant (e.g., LTC3530EDD#TRPBF). Therefore, no soldering or thermal connection to PCB is required for the MSOP version - thermal dissipation relies solely on leads and package body, with θJA = 120°C/W specified accordingly.
How is Burst Mode threshold programmed on LTC3530EMS#TRPBF?
The Burst Mode load-current threshold is set by a single resistor (RBURST) from BURST pin to GND: entering Burst Mode occurs at ILOAD = 8.8/RBURST (kΩ) and exiting at ILOAD = 11.2/RBURST (kΩ). A parallel capacitor (CBURST ≥ COUT·VOUT/60,000) is required for noise immunity and transient rejection - values are validated in Figure G04 and Application Note.
LTC3530EMS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC3530EMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3530EMS#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 LTC3530EMS#TRPBF reliable?
The price and inventory of LTC3530EMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3530EMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3530EMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3530EMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3530EMS#TRPBF?
LTC3530EMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3530EMS#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 LTC3530EMS#TRPBF?
For technical support, including LTC3530EMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3530EMS#TRPBF requirements.
6.How does Aetrix verify that LTC3530EMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3530EMS#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 LTC3530EMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3530EMS#TRPBF?
All LTC3530EMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3530EMS#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 LTC3530EMS#TRPBF part is unused and in its original packaging.
Return procedure for LTC3530EMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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