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Analog Devices Inc. LTC3532EDD#TRPBF
- Part No.:
- LTC3532EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3532EDD#TRPBF.pdf
- Description:
- IC REG BUCK BST ADJ 500MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:8,256
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Product details
Overview
LTC3532EDD#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 35μA quiescent current in Burst Mode - ideal for MP3 players and handheld instruments.
For engineers reviewing the LTC3532EDD#TRPBF datasheet, LTC3532EDD#TRPBF pinout, LTC3532EDD#TRPBF application, or LTC3532EDD#TRPBF equivalent, key selection considerations include its 4-switch topology enabling seamless buck/buck-boost/boost mode transitions, programmable 300kHz–2MHz oscillator, manual or automatic Burst Mode control, and thermal shutdown with 1μA shutdown current.
Technical Context
The LTC3532EDD#TRPBF implements a proprietary 4-switch synchronous buck-boost topology with continuous transfer function across all operating modes. Its internal N-channel (0.36Ω) and P-channel (0.42Ω) MOSFETs enable regulation when VIN is above, below, or equal to VOUT - critical for battery systems with wide discharge curves.
Voltage-mode PWM control uses the VC pin for loop compensation, while the SHDN/SS pin integrates soft-start and shutdown functions. Automatic Burst Mode threshold is set via external resistor on BURST pin, and switching frequency is precisely programmed using RT-to-ground resistor per f(kHz) = 48,000 / RT(kΩ).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.4V to 5.5V - supports full discharge range of single Li-ion (2.5V–4.2V) and 3-cell alkaline/NiMH (3.0V–4.5V) |
| Output Voltage Range | 2.4V to 5.25V - adjustable via FB resistor divider; 1.22V feedback reference enables precise regulation |
| Peak Output Current | 500mA - sufficient for digital cameras, HDD power supplies, and handheld terminals |
| Quiescent Current (Burst) | 35μA - maximizes runtime in low-power portable applications like MP3 players |
| Switching Frequency | 300kHz to 2MHz - externally programmable via RT resistor; higher frequencies reduce inductor/capacitor size |
| Efficiency | Up to 95% - achieved via synchronous rectification and low RDS(ON) MOSFETs (0.36Ω NMOS, 0.42Ω PMOS) |
| Shutdown Current | 1μA - ensures minimal battery drain during system sleep |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed pad (Pin 11), 0.75mm profile, –40°C to 85°C operating temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RT (Pin 1) | Oscillator timing input | Connects to ground via resistor to set switching frequency from 300kHz to 2MHz per f = 48,000/RT(kΩ) |
| BURST (Pin 2) | Burst Mode control | Ground to force Burst Mode; connect to VOUT for fixed-frequency operation; resistor-to-ground sets automatic transition current |
| SW1 (Pin 3) | Switch node A/B connection | Connects inductor to SW2; optional Schottky diode to GND reduces break-before-make loss when VOUT < 4.3V |
| SW2 (Pin 4) | Switch node C/D connection | Connects inductor to SW1; Schottky diode to VOUT required if VOUT > 4.3V to clamp SW2 voltage |
| GND (Pin 5) | Signal and power ground | Reference for all analog and power circuits; exposed pad (Pin 11) must be soldered to PCB GND for thermal performance |
| VOUT (Pin 6) | Regulated output | Delivers stable output; requires ceramic filter capacitor to GND; reverse current protection active in shutdown |
| VIN (Pin 7) | Main input supply | Powers internal circuitry and inductor path; requires ≥4.7μF low-ESR ceramic bypass capacitor close to pin |
| SHDN/SS (Pin 8) | Combined shutdown/soft-start | Ground to shut down; >1.5V to enable; >2.4V to avoid EA clamping; RC network provides controlled soft-start ramp |
| FB (Pin 9) | Feedback input | Connects to resistor divider tap; 1.22V reference enables output adjustment; input bias current ≤50nA minimizes divider error |
| VC (Pin 10) | Error amplifier output | Loop compensation node; connects to FB via RC network; clamped during soft-start and held during Burst Mode |
Key Features
| Feature | Design Value |
|---|---|
| Continuous buck/buck-boost/boost operation | Enables stable regulation across full battery discharge without mode switching artifacts or output discontinuity |
| Programmable Burst Mode threshold | External resistor on BURST pin sets load-current transition point between Burst and fixed-frequency modes |
| Integrated 0.36Ω NMOS and 0.42Ω PMOS switches | Eliminates external FETs and reduces conduction losses - essential for high-efficiency portable designs |
| Active VC clamp in Burst Mode | Prevents output transients during Burst-to-fixed-frequency transitions by holding optimal VC voltage |
| Thermal shutdown and peak current limit | Protects against overload and overtemperature; 1.1A typical peak current limit with foldback during short-circuit |
Applications
| Miniature Hard Disk Drive Power Supply | MP3 Players |
|---|---|
Use Scenario: Powering 2.5-inch HDDs from single Li-ion cell with varying voltage (2.5V–4.2V) while maintaining stable 3.3V rail. IC Role / Device Role / Timing Role: Buck-boost regulator providing continuous, ripple-controlled 3.3V output regardless of input voltage crossing VOUT. Use Value: Eliminates need for separate boost or buck stages; 95% efficiency preserves battery life during bursty HDD spin-up and read/write cycles. | Use Scenario: Supplying audio DAC, flash memory, and display from alkaline/NiMH batteries in portable music players. IC Role / Device Role / Timing Role: Primary system power regulator delivering 3.3V or 5V with ultra-low quiescent current during playback pause or standby. Use Value: 35μA Burst Mode current extends playback time; programmable frequency allows EMI optimization near sensitive audio circuits. |
| Handheld Instruments | Digital Cameras |
Use Scenario: Powering microcontroller, sensors, and LCD in battery-operated multimeters or data loggers. IC Role / Device Role / Timing Role: Single-inductor buck-boost converter supporting wide input (2.4V–5.5V) and precise output (2.4V–5.25V) for mixed-voltage subsystems. Use Value: Pin-compatible upgrade path from LTC3440; soft-start prevents inrush into capacitive loads during power-on reset sequences. | Use Scenario: Supplying image sensor, ISP, and SD card interface from single Li-ion in compact digital cameras. IC Role / Device Role / Timing Role: High-efficiency power stage delivering up to 500mA peak current during flash charging and sensor readout bursts. Use Value: Synchronous rectification and low RDS(ON) minimize heat in sealed enclosures; thermal shutdown prevents damage during extended video capture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3532EMS#TRPBF | Same silicon, 10-lead MSOP package (4.9mm × 3mm); higher θJA (130°C/W on 1-layer board) | Preferred for through-hole prototyping or legacy MSOP footprints; lower thermal performance than DFN | Select for compatibility with existing MSOP layouts; verify thermal margin under 500mA load |
| TPS63020DSJR | TI part with 2A peak current, 2.5V–5.5V input, 1.2V–5.5V output; no programmable Burst threshold; fixed 2.4MHz or 1.2MHz options | Better suited for higher-current applications; lacks manual Burst control and RT-programmable frequency | Choose when >500mA peak load or smaller solution size is required; accept trade-off in Burst Mode flexibility |
Compared with LTC3532EMS#TRPBF, the LTC3532EDD#TRPBF offers superior thermal performance in space-constrained layouts due to its 3mm × 3mm DFN package and exposed pad. Against TPS63020DSJR, it provides finer Burst Mode control and frequency tuning at the expense of lower peak current capability - making it optimal for precision, low-IQ portable systems.
Availability
LTC3532EDD#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 LTC3532EDD#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 acquired Linear Technology in 2017 and maintains its high-performance power management portfolio. The company specializes in precision analog, power, and RF ICs for demanding industrial, automotive, and communications applications.
The LTC3532EDD#TRPBF 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 critical.
FAQ
What is the maximum output current capability of the LTC3532EDD#TRPBF?
The LTC3532EDD#TRPBF supports up to 500mA peak output current. This rating applies under typical conditions with adequate thermal management - such as proper PCB copper area under the exposed pad and ambient temperature ≤85°C. Continuous output current depends on input/output voltage differential, switching frequency, and layout; derating is required at high ambient temperatures or high duty cycles. The device includes peak current limiting (1.1A typical) and thermal shutdown to protect against overload.
How does the LTC3532EDD#TRPBF handle input voltages both above and below the output voltage?
The LTC3532EDD#TRPBF uses a proprietary 4-switch synchronous buck-boost topology that continuously transitions between buck, buck-boost, and boost modes based on the internal control voltage (VCI). When VIN > VOUT, it operates as a buck converter; when VIN < VOUT, as a boost; and when VIN ≈ VOUT, it enters a seamless 4-switch region with ~150ns conduction time. This eliminates output discontinuities and ensures regulation across the full 2.4V–5.5V input range for any 2.4V–5.25V output setting - a core feature of the LTC3532EDD#TRPBF.
Can the LTC3532EDD#TRPBF be used with an output voltage higher than 4.3V?
Yes, but with a mandatory design requirement: a Schottky diode must be placed from SW2 to VOUT when the regulated output exceeds 4.3V. This protects the internal PMOS switch D from exceeding its absolute maximum voltage rating during switching transitions. The diode must be surface-mount (e.g., MBRM120T3), placed as close as possible to the SW2 and VOUT pins to minimize parasitic inductance. Failure to include this diode risks permanent damage to the LTC3532EDD#TRPBF in boost-dominant operation.
What is the purpose of the VC pin on the LTC3532EDD#TRPBF, and how should it be used?
VC is the error amplifier output pin on the LTC3532EDD#TRPBF and serves as the control node for loop compensation. An RC network must be connected between VC and FB to stabilize the voltage-mode control loop - typically a series resistor and capacitor from VC to FB, sometimes augmented with feedforward components. During Burst Mode, VC is actively clamped to prevent drift; during soft-start, VC is clamped until SHDN/SS rises above 2.4V. Proper VC compensation directly determines transient response and phase margin - incorrect values cause oscillation or sluggish regulation.
Is the LTC3532EDD#TRPBF pin-compatible with other devices in the same family?
Yes, the LTC3532EDD#TRPBF is pin-compatible with the LTC3440 in the same 10-lead DFN package. This allows direct replacement in existing designs targeting similar input/output ranges and efficiency requirements. However, functional differences exist: the LTC3532EDD#TRPBF adds programmable Burst Mode threshold, improved efficiency at light loads (35μA vs. ~50μA), and enhanced current limiting. Layout reuse is possible, but review RT, BURST, and compensation networks to ensure optimal performance with the LTC3532EDD#TRPBF.
LTC3532EDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- 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-DFN (3x3)
LTC3532EDD#TRPBF FAQ
1.How can I place an order for LTC3532EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3532EDD#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 LTC3532EDD#TRPBF reliable?
The price and inventory of LTC3532EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3532EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3532EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3532EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3532EDD#TRPBF?
LTC3532EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3532EDD#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 LTC3532EDD#TRPBF?
For technical support, including LTC3532EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3532EDD#TRPBF requirements.
6.How does Aetrix verify that LTC3532EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3532EDD#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 LTC3532EDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3532EDD#TRPBF?
All LTC3532EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3532EDD#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 LTC3532EDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3532EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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