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Analog Devices Inc. LTC3532EMS#PBF
- Part No.:
- LTC3532EMS#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC3532EMS#PBF.pdf
- Description:
- IC REG BUCK BST ADJ 500MA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:182
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Product details
Overview
LTC3532EMS#PBF from Analog Devices (formerly Linear Technology) is a micropower synchronous buck-boost DC/DC converter IC designed for single-cell Li-ion, multi-cell alkaline, or NiMH battery-powered systems where input voltage may fall above, below, or equal to the regulated output. It delivers up to 500mA peak output current, operates from 2.4V to 5.5V input, regulates output from 2.4V to 5.25V, and achieves up to 95% efficiency using integrated 0.36Ω NMOS and 0.42Ω PMOS switches.
For engineers reviewing the LTC3532EMS#PBF datasheet, LTC3532EMS#PBF pinout, LTC3532EMS#PBF application, or LTC3532EMS#PBF equivalent, key selection considerations include its 35μA Burst Mode quiescent current, programmable 300kHz–2MHz oscillator, automatic/manual Burst Mode control, output disconnect in shutdown, and compatibility with compact 10-lead MSOP packaging for space-constrained portable power designs.
Technical Context
The LTC3532EMS#PBF implements a four-switch buck-boost topology with continuous transfer function across buck, buck-boost, and boost modes-enabling seamless regulation when VIN crosses VOUT. Its internal PWM logic and anti-cross-conduction circuitry coordinate NMOS (SW1/SW2) and PMOS (SW1/SW2) switch pairs based on error amplifier output (VC) and internal control voltage (VCI), ensuring smooth mode transitions without output disruption.
It features dual current limiting: a 50ns-response peak current limit (1.1A typical) and a closed-loop input current clamp (1A typical), plus reverse current limiting (340mA typical) during fixed-frequency operation. The error amplifier supports voltage-mode control with 90dB open-loop gain and external Type II/III compensation via VC–FB network.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.4V to 5.5V - supports full discharge of single Li-ion (2.5V–4.2V) and multi-cell alkaline/NiMH batteries. |
| Output Voltage Range | 2.4V to 5.25V - adjustable via external resistor divider; 1.22V feedback reference enables precise regulation. |
| Peak Output Current | 500mA - sufficient for digital cameras, MP3 players, and handheld terminals under transient loads. |
| Quiescent Current (Burst Mode) | 35μA - maximizes runtime in low-power sleep states for battery-operated devices. |
| Switching Frequency | 300kHz to 2MHz - set by external RT resistor; higher frequencies reduce inductor/capacitor size but increase gate charge losses. |
| Efficiency | Up to 95% - achieved via synchronous rectification with low RDS(ON) MOSFETs and optimized gate drive. |
| Shutdown Current | 0.1μA - ensures near-zero battery drain when system is powered off. |
Pinout & Package
The LTC3532EMS#PBF is housed in a thermally enhanced 10-lead plastic MSOP package (3mm × 3mm footprint, 0.75mm profile), with exposed pad connected to GND for optimal thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RT (Pin 1) | Oscillator timing input | Connects to ground via resistor to program switching frequency from 300kHz to 2MHz per f = 48,000/RT(kΩ) kHz. |
| BURST (Pin 2) | Burst Mode control | Ground for forced Burst Mode; connect to VOUT for fixed-frequency operation; add RC network for automatic load-triggered mode switching. |
| SW1 (Pin 3) | Switch node A/B connection | Connects internal NMOS B and PMOS A; ties to one end of power inductor; optional Schottky diode to GND improves light-load efficiency. |
| SW2 (Pin 4) | Switch node C/D connection | Connects internal NMOS C and PMOS D; ties to other end of inductor; Schottky diode to VOUT required if VOUT > 4.3V. |
| GND (Pin 5) | Signal and power ground | Reference for all analog circuits and return path for high-current switch paths; must be low-impedance PCB plane. |
| VOUT (Pin 6) | Regulated output | Delivers final DC output; requires ceramic filter capacitor (≥10μF) from VOUT to GND for ripple suppression. |
| VIN (Pin 7) | Main power input | Supplies IC bias and inductor current path; requires ≥4.7μF low-ESR ceramic bypass capacitor placed adjacent to PIN 7 and GND. |
| SHDN/SS (Pin 8) | Combined shutdown/soft-start | Ground to disable IC; pull >1.5V to enable; >2.4V ensures full EA range; RC network provides controlled VC ramp for inrush-limited startup. |
| FB (Pin 9) | Feedback input | Connects to resistor divider midpoint; senses output voltage against 1.22V internal reference; input current <50nA minimizes divider error. |
| VC (Pin 10) | Error amplifier output | Provides loop compensation node; external RC network from VC to FB sets stability; clamped during soft-start and Burst Mode. |
Key Features
| Feature | Design Value |
|---|---|
| Four-switch synchronous buck-boost topology | Enables continuous regulation across VIN > VOUT (buck), VIN ≈ VOUT (buck-boost), and VIN < VOUT (boost) without mode-hopping artifacts. |
| Programmable Burst Mode operation | Reduces quiescent current to 35μA at light loads while maintaining regulation; transition current set by single external resistor on BURST pin. |
| Integrated low-RDS(ON) MOSFETs | 0.36Ω NMOS (SW1/SW2) and 0.42Ω PMOS (SW1/SW2) minimize conduction loss and eliminate need for external power switches. |
| Output disconnect in shutdown | Prevents battery drain through load during system off-state by isolating VOUT from internal circuitry. |
| Thermal shutdown and current limiting | Protects against overtemperature (>125°C) and overcurrent (1.1A peak, 1A clamped) without external components. |
Applications
| Miniature Hard Disk Drive Power Supply | MP3 Players |
|---|---|
Use Scenario: Powering 2.5-inch HDDs from single Li-ion cells where input drops from 4.2V to 2.5V during discharge. IC Role / Device Role / Timing Role: Primary buck-boost regulator delivering stable 3.3V or 5V rail with seamless mode transition as VIN crosses VOUT. Use Value: Eliminates need for separate buck + boost converters; maintains >90% efficiency across full battery range; reduces BOM count and PCB area. | Use Scenario: Supplying audio DAC, flash memory, and display backlight in portable music players. IC Role / Device Role / Timing Role: Main system power IC providing regulated 3.3V output with ultra-low quiescent current during playback pause or standby. Use Value: Extends battery life via 35μA Burst Mode; supports rapid wake-up from sleep with soft-start control; handles dynamic load steps up to 500mA peak. |
| Handheld Instruments | Digital Cameras |
Use Scenario: Powering precision ADCs, op-amps, and microcontrollers in battery-operated test meters and data loggers. IC Role / Device Role / Timing Role: Low-noise, fixed-frequency DC/DC source with tight output regulation (±1.5% over temp) and minimal load-dependent ripple. Use Value: Ensures measurement accuracy by suppressing switching noise coupling into analog signal paths; thermal shutdown prevents damage during extended use. | Use Scenario: Supplying image sensor, ISP, and LCD driver in compact digital still/video cameras. IC Role / Device Role / Timing Role: High-efficiency power stage delivering 2.8V or 3.3V from declining battery; manages bursty loads during autofocus, flash charging, and video encoding. Use Value: Delivers 500mA peak current without dropout; programmable Burst Mode extends recording time; output disconnect preserves battery during storage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3532EDD#PBF | Identical electrical specs and pinout; differs only in 10-lead (3mm × 3mm) DFN package instead of MSOP. | DFN offers lower thermal resistance (θJA = 43°C/W vs. 100°C/W for MSOP on 4-layer board) and smaller footprint. | Select LTC3532EDD#PBF for higher power density or improved thermal performance; verify PCB land pattern and reflow profile compatibility. |
| TPS63020DSJR | Fixed 3.3V output (non-adjustable); 96% max efficiency; 2.5V–5.5V input; 2A peak output; no Burst Mode pin control. | Designed for cost-sensitive, fixed-output applications; lacks programmable Burst threshold and manual mode override. | Choose TPS63020DSJR only if output voltage is fixed at 3.3V and 2A peak current is required; not suitable for adjustable VOUT or fine-grained light-load optimization. |
Compared with LTC3532EDD#PBF, the LTC3532EMS#PBF offers identical regulation performance but trades thermal performance for easier hand-soldering and probe access in prototyping; versus TPS63020DSJR, it provides adjustable output and granular Burst Mode control at the expense of peak current capability and integration level.
Availability
LTC3532EMS#PBF is available at Aetrix Electronics and suitable for miniature hard disk drive power supplies, MP3 players, handheld instruments, and digital cameras requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for LTC3532EMS#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3532EMS#PBF belongs to ADI's Power Management product line, engineered specifically for ultra-low-power, wide-input-range DC/DC conversion in portable and battery-critical applications where seamless buck-boost operation and micropower efficiency are essential.
FAQ
What is the maximum output current capability of the LTC3532EMS#PBF?
The LTC3532EMS#PBF supports up to 500mA peak output current under typical conditions. This value is limited by internal current protection circuits (1.1A peak switch limit and 1A input clamp) and thermal constraints of the 10-lead MSOP package. Continuous output current depends on ambient temperature, PCB layout, and input/output voltage differential-derating is required above 85°C ambient or with poor thermal dissipation.
Does the LTC3532EMS#PBF require external Schottky diodes?
The LTC3532EMS#PBF does not require external Schottky diodes for VOUT ≤ 4.3V. However, a Schottky diode from SW2 to VOUT is mandatory when output voltage exceeds 4.3V to prevent excessive voltage stress on SW2. An optional Schottky diode from SW1 to GND may be added to improve light-load efficiency by reducing break-before-make losses, especially in Burst Mode.
How is the switching frequency programmed on the LTC3532EMS#PBF?
The switching frequency of the LTC3532EMS#PBF is set by an external resistor (RT) connected from Pin 1 (RT) to GND. The relationship is f(kHz) = 48,000 / RT(kΩ), supporting 300kHz to 2MHz. For example, a 64.9kΩ resistor yields ~740kHz. Frequency accuracy is ±15% over temperature and line, and the RT pin accepts 0V to 5V-no additional biasing is needed.
Can the LTC3532EMS#PBF operate with input voltage equal to output voltage?
Yes-the LTC3532EMS#PBF is explicitly designed for VIN = VOUT operation via its four-switch buck-boost topology. In this region, it enters the "buck/boost" or "4-switch" mode where all four internal MOSFETs are actively phased to maintain regulation with continuous inductor current and no discontinuity. The transition occurs smoothly around VIN/VOUT = 1 ± (150ns × f), ensuring stable output even during battery voltage crossover.
What is the purpose of the SHDN/SS pin on the LTC3532EMS#PBF?
The SHDN/SS pin (Pin 8) serves dual functions: grounding it shuts down the LTC3532EMS#PBF with 0.1μA quiescent current and output disconnect; pulling it above 1.5V enables the device. When raised above 2.4V, it releases the error amplifier output (VC) clamp, allowing full duty-cycle range. An RC network from a control signal to SHDN/SS provides programmable soft-start by controlling VC ramp rate, preventing inrush current and output overshoot.
LTC3532EMS#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):
- 2.4V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.4V
- Voltage - Output (Max):
- 5.25V
- Current - Output:
- 500mA
- 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
LTC3532EMS#PBF FAQ
1.How can I place an order for LTC3532EMS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3532EMS#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 LTC3532EMS#PBF reliable?
The price and inventory of LTC3532EMS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3532EMS#PBF is usually 5 days.
3.What payment methods are accepted for LTC3532EMS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3532EMS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3532EMS#PBF?
LTC3532EMS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3532EMS#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 LTC3532EMS#PBF?
For technical support, including LTC3532EMS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3532EMS#PBF requirements.
6.How does Aetrix verify that LTC3532EMS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3532EMS#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 LTC3532EMS#PBF meets industry standards.
7.What is the process for return or replacement of LTC3532EMS#PBF?
All LTC3532EMS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3532EMS#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 LTC3532EMS#PBF part is unused and in its original packaging.
Return procedure for LTC3532EMS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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