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Analog Devices Inc. LTC3532EDD#PBF
- Part No.:
- LTC3532EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3532EDD#PBF.pdf
- Description:
- IC REG BUCK BST ADJ 500MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:814
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Product details
Overview
LTC3532EDD#PBF 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 using integrated 0.36Ω NMOS and 0.42Ω PMOS switches.
For engineers reviewing the LTC3532EDD#PBF datasheet, LTC3532EDD#PBF pinout, LTC3532EDD#PBF application, or LTC3532EDD#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 thermal shutdown with 125°C junction limit - all critical for portable instrumentation, digital cameras, and handheld terminals.
Technical Context
The LTC3532EDD#PBF implements a proprietary four-switch buck-boost topology enabling seamless transition between buck, buck-boost, and boost modes without discontinuity. Its internal control voltage (VCI) determines operating region: VCI < 0.9V disables switching; 0.9V–1.55V enables buck mode; 1.55V–1.65V activates 4-switch buck-boost; >1.65V enters boost mode. The error amplifier outputs VC, which directly sets duty cycle and is actively clamped during Burst Mode to prevent output transients on mode re-entry.
It integrates dual N-channel (0.36Ω) and dual P-channel (0.42Ω) MOSFETs, supports fixed-frequency PWM or low-noise Burst Mode operation, and features two independent current-limit circuits: a 1.1A peak switch-current limiter and a closed-loop 1A input-current clamp with foldback during short-circuit. Reverse current limiting shuts off SW2 when inductor current falls below –340mA in fixed-frequency mode.
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; feedback reference is 1.22V ±3% over temperature. |
| Peak Output Current | Up to 500mA - limited by internal 1.1A peak switch current and thermal design; actual deliverable load depends on VIN, VOUT, and PCB layout. |
| Quiescent Current | 35μA in Burst Mode - extends battery runtime in standby or light-load portable applications. |
| 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 and low RDS(ON) integrated MOSFETs; peak efficiency occurs at medium loads in fixed-frequency mode. |
| Shutdown Current | 0.1μA - ensures near-zero battery drain when disabled; output disconnect prevents backfeed. |
Pinout & Package
The LTC3532EDD#PBF is housed in a thermally enhanced 10-lead (3mm × 3mm) plastic DFN package with exposed pad (Pin 11), which must be soldered to PCB ground for electrical integrity and thermal performance (θJA = 43°C/W).
| 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(kHz) = 48,000/RT(kΩ). |
| BURST (Pin 2) | Burst Mode control | Ground to force Burst Mode; connect to VOUT to force fixed-frequency; add RC network for automatic threshold programming. |
| SW1 (Pin 3) | Switch node A/B connection | Connects internal NMOS B and PMOS A; ties to one end of power 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 end of inductor; Schottky diode 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 switches; must be low-impedance and tied to exposed pad. |
| VOUT (Pin 6) | Regulated output | Delivers regulated voltage; requires ceramic output capacitor (≥10μF) from VOUT to GND for stability and ripple suppression. |
| VIN (Pin 7) | Main power input | Supplies IC bias and inductor current; requires ≥4.7μF low-ESR ceramic bypass capacitor placed adjacent to VIN and GND pins. |
| SHDN/SS (Pin 8) | Combined shutdown/soft-start | Ground to disable IC; pull >1.5V to enable; >2.4V ensures unclamped error amp; RC network provides controlled soft-start ramp. |
| FB (Pin 9) | Feedback input | Connects to resistor divider midpoint; senses output voltage; reference is 1.22V; input bias current ≤50nA enables high-impedance dividers. |
| VC (Pin 10) | Error amplifier output | Provides loop compensation node; connect RC network from VC to FB for stability; actively clamped during Burst Mode to minimize transients. |
Key Features
| Feature | Design Value |
|---|---|
| Continuous conduction across VIN/VOUT ranges | Four-switch architecture enables seamless buck/buck-boost/boost transitions - no output dropout or mode-switching glitches when VIN crosses VOUT. |
| Programmable Burst Mode entry/exit thresholds | External RBURST resistor sets load-current thresholds (e.g., 10.5V/RBURST kΩ for entry); prevents oscillation with added CBURST filter capacitor. |
| Integrated low-RDS(ON) MOSFETs | 0.36Ω NMOS and 0.42Ω PMOS switches eliminate external FETs and reduce board area while maintaining >90% efficiency at 100mA load. |
| Active VC clamping in Burst Mode | Internal circuit holds VC at optimal voltage during sleep cycles - eliminates output overshoot/undershoot when returning to fixed-frequency operation. |
| Reverse current limiting | Monitors inductor current direction; shuts off SW2 if negative current exceeds –340mA - prevents energy backflow into source during light-load boost operation. |
Applications
| Miniature Hard Disk Drive Power Supply | MP3 Players |
|---|---|
Use Scenario: Powers 2.5" or 1.8" HDDs from single Li-ion cell where supply voltage drops from 4.2V to 2.5V during discharge. IC Role / Device Role / Timing Role: Regulates stable 3.3V rail regardless of input sag; maintains continuous data transfer without brownout-induced retries. Use Value: Eliminates need for separate buck + boost stages; reduces component count by 40% vs discrete solutions while sustaining >92% efficiency across full battery range. | Use Scenario: Supplies audio codec and flash memory in portable MP3 players with variable battery voltage (2.8V–4.2V). IC Role / Device Role / Timing Role: Delivers clean, low-noise 3.3V power; Burst Mode cuts quiescent current to 35μA during playback pause or menu navigation. Use Value: Extends battery life by >30% versus fixed-frequency converters; integrated switches reduce EMI-sensitive layout complexity. |
| Handheld Instruments | Digital Cameras |
Use Scenario: Powers precision ADCs, op-amps, and microcontrollers in battery-operated multimeters and oscilloscopes. IC Role / Device Role / Timing Role: Provides low-ripple, tightly regulated 3.3V or 5V rail; soft-start prevents inrush-induced sensor offset errors during power-up. Use Value: Achieves <10mVpp output ripple with 22μF ceramic output cap; thermal shutdown protects against probe-overload-induced overheating. | Use Scenario: Supplies image sensor, ISP, and LCD backlight drivers in compact digital cameras with dual-cell alkaline input (1.8V–3.2V). IC Role / Device Role / Timing Role: Maintains 3.3V output even as battery sags below 2.4V; programmable oscillator allows 1MHz operation to shrink 4.7μH inductor footprint. Use Value: Enables 3mm × 3mm solution size; output disconnect in shutdown prevents battery drain during storage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3440EDD#PBF | Pin-compatible predecessor; lower 1.2MHz max frequency; 50μA Burst Mode IQ; no reverse current limiting. | Suitable for legacy designs where 1.2MHz suffices and reverse current protection is unnecessary. | Select LTC3532EDD#PBF for higher efficiency, wider frequency range, and robust reverse-current protection in new designs. |
| TPS63020DSJR | TI part with 96% peak efficiency; 2A output capability; 2.5V–5.5V input; no programmable Burst threshold; different pinout. | Better for higher-current applications (e.g., >500mA) but requires PCB redesign due to non-pin-compatible layout. | Choose LTC3532EDD#PBF when 500mA peak load, ultra-low IQ, and minimal footprint are prioritized over raw current capacity. |
Compared with LTC3440EDD#PBF, the LTC3532EDD#PBF offers lower quiescent current (35μA vs 50μA), higher max frequency (2MHz vs 1.2MHz), and integrated reverse-current limiting - making it superior for next-gen portable devices demanding longer runtime and tighter regulation. Versus TPS63020DSJR, it trades higher current capability for smaller size and lower standby power.
Availability
LTC3532EDD#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 traceable sourcing.
Supply support for LTC3532EDD#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 continues its legacy of high-performance power management ICs with rigorous reliability testing and automotive-grade process controls.
The LTC3532EDD#PBF belongs to Linear's micropower DC/DC converter product line, engineered specifically for battery-powered portable electronics where input voltage varies across the output range and ultra-low quiescent current is essential for extended runtime.
FAQ
What is the maximum output current capability of the LTC3532EDD#PBF?
The LTC3532EDD#PBF supports up to 500mA peak output current under typical conditions (VIN = 3.6V, VOUT = 3.3V, TA = 25°C). This is constrained by its internal 1.1A peak switch current limit and thermal dissipation in the 3mm × 3mm DFN package. Sustained output current depends on ambient temperature, PCB copper area, and airflow; derating is required above 85°C ambient.
Does the LTC3532EDD#PBF require external Schottky diodes?
The LTC3532EDD#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. For optimal efficiency at light loads, optional Schottky diodes from SW1 to GND and SW2 to VOUT can improve peak efficiency by 1–2% during break-before-make transitions.
How is Burst Mode operation enabled or disabled on the LTC3532EDD#PBF?
Burst Mode operation on the LTC3532EDD#PBF is controlled via the BURST pin (Pin 2): grounding forces Burst Mode; connecting to VOUT forces fixed-frequency operation. For automatic mode, an external resistor from BURST to GND sets the load-current threshold (e.g., 10.5V/RBURST kΩ for entry), and a capacitor filters noise to prevent oscillation. Burst Mode is inhibited during soft-start.
What package type and thermal characteristics apply to the LTC3532EDD#PBF?
The LTC3532EDD#PBF uses a 10-lead (3mm × 3mm) plastic DFN package with exposed thermal pad (Pin 11), which must be soldered to PCB ground. Its thermal resistance is θJA = 43°C/W on a 4-layer board. Maximum junction temperature is 125°C; thermal shutdown activates above this threshold to protect the device during overload or poor heatsinking conditions.
Can the LTC3532EDD#PBF regulate output voltage when input drops below 2.4V?
No - the LTC3532EDD#PBF has a minimum input start-up voltage of 2.3V and a specified input operating range of 2.4V to 5.5V. Below 2.4V, regulation cannot be guaranteed; the device may cease switching or enter undervoltage lockout. For applications requiring operation down to 2.0V, consider alternative parts such as the LTC3536 or TPS63001, which support lower VIN minima.
LTC3532EDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- 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-DFN (3x3)
LTC3532EDD#PBF FAQ
1.How can I place an order for LTC3532EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3532EDD#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 LTC3532EDD#PBF reliable?
The price and inventory of LTC3532EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3532EDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3532EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3532EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3532EDD#PBF?
LTC3532EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3532EDD#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 LTC3532EDD#PBF?
For technical support, including LTC3532EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3532EDD#PBF requirements.
6.How does Aetrix verify that LTC3532EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3532EDD#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 LTC3532EDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3532EDD#PBF?
All LTC3532EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3532EDD#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 LTC3532EDD#PBF part is unused and in its original packaging.
Return procedure for LTC3532EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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