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Analog Devices Inc. LTC3532EMS#TRPBF
- Part No.:
- LTC3532EMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC3532EMS#TRPBF.pdf
- Description:
- IC REG BUCK BST ADJ 500MA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,241
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Product details
Overview
LTC3532EMS#TRPBF from Analog Devices (formerly Linear Technology) is a micropower synchronous buck-boost DC/DC converter 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 with integrated 0.36Ω NMOS and 0.42Ω PMOS switches.
For engineers reviewing the LTC3532EMS#TRPBF datasheet, LTC3532EMS#TRPBF pinout, LTC3532EMS#TRPBF application, or LTC3532EMS#TRPBF equivalent, key selection considerations include its 35μA Burst Mode quiescent current, programmable 300kHz–2MHz switching frequency via RT pin, automatic/manual Burst Mode control, output disconnect in shutdown, and thermal shutdown protection - all in a thermally enhanced 10-lead MSOP package.
Technical Context
The LTC3532EMS#TRPBF implements a four-switch buck-boost topology with continuous transfer function across buck, buck-boost, and boost modes. Its internal control voltage (VCI) determines mode transitions: buck (VIN > VOUT) uses switches A/B; boost (VIN < VOUT) uses switches C/D; and buck-boost (VIN ≈ VOUT) phases all four switches with 150ns 4-switch region duty cycle.
It features voltage-mode PWM control with error amplifier output (VC) driving gate drivers through anti-cross-conduction logic. The IC includes dual current limiting: fast peak current limit (1.1A typical) and closed-loop input current clamp (1A typical), plus reverse current limit (340mA typical) in fixed-frequency mode to prevent negative inductor current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.4V to 5.5V - supports full discharge curve of single Li-ion (2.5V–4.2V) and multi-cell alkaline/NiMH without brownout. |
| 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 portable instrumentation, digital cameras, and handheld terminals under transient loads. |
| Quiescent Current (Burst) | 35μA - maximizes battery runtime in low-power sleep states while maintaining regulation. |
| Switching Frequency | 300kHz to 2MHz - set by external RT resistor; higher frequencies reduce inductor/capacitor size but increase gate charge losses. |
| Efficiency (Typical) | Up to 95% - achieved via synchronous rectification with low-RDS(ON) integrated MOSFETs and optimized gate drive. |
| Shutdown Current | 0.1μA - ensures near-zero battery drain when system is powered off. |
Pinout & Package
Package: 10-lead plastic MSOP (3mm × 3mm footprint, 1.1mm height), thermally enhanced with exposed pad connected to GND for optimal power dissipation (θJA = 100°C/W on 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RT (Pin 1) | Oscillator timing input | Resistor-to-ground sets switching frequency from 300kHz to 2MHz per f(kHz) = 48,000 / RT(kΩ). |
| BURST (Pin 2) | Burst Mode control | Ground for forced Burst Mode; connect to VOUT for fixed-frequency; use RC network for automatic load-threshold transition. |
| SW1 (Pin 3) | Switch node A/B connection | Connects internal NMOS B and PMOS A; ties to one end of inductor; optional Schottky to GND for <4.3V VOUT. |
| SW2 (Pin 4) | Switch node C/D connection | Connects internal NMOS C and PMOS D; ties to other inductor end; Schottky to VOUT required if VOUT > 4.3V. |
| GND (Pin 5) | Signal and power ground | Reference for all analog circuitry and return path for high-current switch paths; must be low-impedance. |
| VOUT (Pin 6) | Regulated output | Delivers regulated voltage; requires ceramic output capacitor (≥10μF) close to pin for stability and ripple suppression. |
| VIN (Pin 7) | Main power input | Supplies internal VCC and inductor current; requires ≥4.7μF low-ESR ceramic bypass capacitor adjacent to GND. |
| SHDN/SS (Pin 8) | Combined shutdown/soft-start | Ground to shut down; pull >1.5V to enable; >2.4V to unclamp error amp; RC network provides controlled VC ramp. |
| FB (Pin 9) | Feedback input | Connects to resistor divider midpoint; senses output voltage against 1.22V internal reference for regulation. |
| VC (Pin 10) | Error amplifier output | Drives PWM comparators; compensation network (RC) connects FB–VC to stabilize loop across all operating modes. |
Key Features
| Feature | Design Value |
|---|---|
| Four-switch synchronous buck-boost topology | Enables seamless operation with VIN above, below, or equal to VOUT - no mode-switching discontinuities or output glitches. |
| Programmable Burst Mode threshold | Load-current transition point (enter/leave) set precisely via single external resistor (RBURST), enabling optimization for specific standby/load profiles. |
| Active VC clamp during Burst Mode | Holds error amp output at optimal voltage to eliminate output transients when returning to fixed-frequency operation - critical for stable system wake-up. |
| Integrated 0.36Ω NMOS / 0.42Ω PMOS switches | Eliminates external FETs and gate drivers; reduces BOM count and layout complexity while ensuring matched timing and low conduction loss. |
| Output disconnect in shutdown | Prevents backfeed from VOUT to VIN during system off-state - essential for battery-powered devices with multiple power domains. |
Applications
| Miniature Hard Disk Drive Power Supply | MP3 Players |
|---|---|
Use Scenario: Powering 2.5" or 1.8" HDDs from single Li-ion cell where VBAT drops from 4.2V to 2.5V during discharge. IC Role / Device Role / Timing Role: Primary voltage regulator delivering stable 3.3V or 5V rail with continuous buck-boost capability and low-noise fixed-frequency operation. Use Value: Maintains HDD spindle motor and interface voltage within spec across full battery range, avoiding reset or data corruption during deep discharge. | Use Scenario: Supplying audio DAC, flash memory, and LCD backlight in portable music players with alkaline/NiMH batteries. IC Role / Device Role / Timing Role: System power manager providing regulated 3.3V output while minimizing quiescent current during playback pause or standby. Use Value: Extends battery life by 30%+ versus non-Burst alternatives due to 35μA shutdown and adaptive light-load efficiency. |
| Handheld Instruments | Digital Cameras |
Use Scenario: Powering precision ADCs, op-amps, and microcontrollers in battery-operated multimeters or data loggers. IC Role / Device Role / Timing Role: Low-noise, high-PSRR power source with soft-start and thermal protection for sensitive analog front-ends. Use Value: Prevents measurement drift during power-up and eliminates supply-induced noise in sub-mV signal chains. | Use Scenario: Supplying image sensor, ISP, and memory in compact digital still/video cameras using single Li-ion cells. IC Role / Device Role / Timing Role: High-efficiency, fast-transient response regulator supporting burst-mode imaging and video recording. Use Value: Delivers 500mA peak current for flash LED or sensor readout without output droop, while sustaining >90% efficiency at 100mA typical load. |
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 |
|---|---|---|---|
| LTC3532EDD#TRPBF | Same die, 10-lead (3mm × 3mm) DFN package with exposed pad; θJA = 43°C/W vs 100°C/W for MSOP; identical electrical specs. | Better thermal performance in space-constrained layouts; requires PCB thermal pad connection; not pin-compatible with MSOP footprint. | Select for higher power density or lower junction temperature; verify PCB land pattern and reflow profile for DFN. |
| TPS63020DSJR | TI part with 2A peak current, 2.5V–5.5V input, 1.2V–5.5V output; 3.5μA quiescent current; no programmable Burst threshold; different pinout and compensation scheme. | Higher output current capability but less precise Burst control; lacks active VC clamp; requires different loop compensation design. | Select when >500mA peak load is needed or ultra-low IQ dominates design priority; expect layout and compensation redesign. |
Compared with LTC3532EDD#TRPBF, the LTC3532EMS#TRPBF offers superior thermal management on standard 4-layer boards but slightly larger footprint; versus TPS63020DSJR, it provides deterministic Burst Mode transition control and proven stability in low-noise portable applications, albeit at lower peak current.
Availability
LTC3532EMS#TRPBF 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 traceable sourcing.
Supply support for LTC3532EMS#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. (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#TRPBF 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 minimal quiescent current are mandatory.
FAQ
What is the maximum output current capability of the LTC3532EMS#TRPBF?
The LTC3532EMS#TRPBF supports up to 500mA peak output current under typical conditions. This value is limited by internal current sensing and thermal constraints - sustained 500mA loads require adequate PCB copper area and airflow. The device also features a 1.1A typical peak current limit and 1A closed-loop input current clamp to protect against overload and short-circuit events.
How does the LTC3532EMS#TRPBF achieve seamless voltage regulation when input falls below output?
The LTC3532EMS#TRPBF uses a four-switch synchronous buck-boost topology that dynamically phases internal NMOS and PMOS switches (A/B/C/D) based on the error amplifier output (VC). When VIN drops near VOUT, it enters a continuous 4-switch region (typically 150ns duty cycle) that transitions smoothly from buck to boost without output disruption - enabling stable 3.3V output from a discharging 3.6V nominal Li-ion cell.
Can the LTC3532EMS#TRPBF be used with output voltages above 4.3V?
Yes, but with a mandatory external Schottky diode from SW2 to VOUT. The LTC3532EMS#TRPBF datasheet specifies this requirement to prevent excessive voltage stress on internal switch D when VOUT exceeds 4.3V. The diode must be placed as close as possible to the SW2 and VOUT pins to minimize parasitic inductance and ensure reliable clamping during switching transitions.
What is the purpose of the VC pin on the LTC3532EMS#TRPBF, and how is it used?
VC is the error amplifier output pin of the LTC3532EMS#TRPBF, directly driving the PWM comparators and gate drivers. A frequency compensation network (typically RC) is connected between VC and FB to stabilize the control loop across buck, boost, and buck-boost regions. During Burst Mode, VC is actively clamped to prevent drift - eliminating output transients when returning to fixed-frequency operation.
Does the LTC3532EMS#TRPBF support manual control of Burst Mode operation?
Yes, the LTC3532EMS#TRPBF supports both automatic and manual Burst Mode control via the BURST pin. To force fixed-frequency operation, connect BURST to VOUT; to force Burst Mode, ground the BURST pin. Manual control is recommended for systems with large dynamic loads - commanding fixed-frequency mode before a load step minimizes output voltage droop and improves transient response predictability.
LTC3532EMS#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):
- 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#TRPBF FAQ
1.How can I place an order for LTC3532EMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3532EMS#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 LTC3532EMS#TRPBF reliable?
The price and inventory of LTC3532EMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3532EMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3532EMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3532EMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3532EMS#TRPBF?
LTC3532EMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3532EMS#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 LTC3532EMS#TRPBF?
For technical support, including LTC3532EMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3532EMS#TRPBF requirements.
6.How does Aetrix verify that LTC3532EMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3532EMS#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 LTC3532EMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3532EMS#TRPBF?
All LTC3532EMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3532EMS#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 LTC3532EMS#TRPBF part is unused and in its original packaging.
Return procedure for LTC3532EMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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