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Analog Devices Inc. LTC3530EDD#PBF
- Part No.:
- LTC3530EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3530EDD#PBF.pdf
- Description:
- IC REG BUCK BST ADJ 600MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:145
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Product details
Overview
LTC3530EDD#PBF 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, supports 1.8V–5.5V input and 1.8V–5.25V output, operates up to 2MHz, and achieves up to 96% efficiency via synchronous rectification.
For engineers reviewing the LTC3530EDD#PBF datasheet, LTC3530EDD#PBF pinout, LTC3530EDD#PBF application, or LTC3530EDD#PBF equivalent, key selection considerations include programmable automatic Burst Mode threshold, 10-lead 3mm × 3mm DFN thermal performance (θJA = 43°C/W), fixed-frequency vs. Burst Mode quiescent current trade-offs (40μA vs. 700–1200μA), and four-switch topology enabling seamless buck/buck-boost/boost transitions without output discontinuity.
Technical Context
The LTC3530EDD#PBF implements a proprietary four-switch buck-boost topology with internal NMOS/PMOS power switches (RDS(ON) = 0.21Ω/0.24Ω), enabling continuous conduction across VIN/VOUT crossover. Its voltage-mode error amplifier (AVOL = 90dB, Gm = 1/60kΩ) controls duty cycle via VC pin, with loop compensation configured externally between FB and VC.
Switching frequency (0.7–1.3MHz typical, programmable via RT pin resistor) and Burst Mode entry/exit thresholds (set by RBURST from BURST pin to GND) are independently configurable. Internal protection includes peak input current limit (1–2A), reverse current limit (640mA), thermal shutdown (TJMAX = 125°C), and short-circuit protection - all active across –40°C to 85°C operating range.
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 = 1.215V ±24mV over temperature. |
| Continuous Output Current | 600mA from Li-ion (VIN ≥ 3.0V); 250mA from 1.8V input - defines minimum inductor saturation current and output capacitor ripple handling. |
| Switching Frequency | 0.7MHz to 1.3MHz (typical) - set by RT pin resistor; higher frequencies reduce inductor/capacitor size but increase gate charge losses. |
| Burst Mode Quiescent Current | 40μA (typ) - enables >100-hour standby in portable devices with sub-1mA loads while maintaining regulation. |
| Shutdown Current | 0.1μA (max) - ensures negligible battery drain during system sleep; SHDN/SS pin threshold = 0.4V (disable) / 1.4V (enable). |
| Efficiency | Up to 96% - achieved via synchronous rectification and low RDS(ON) switches; measured at 500mA, 3.3VOUT, 3.6VIN. |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed pad (Pin 11), thermally enhanced for θJA = 43°C/W. Exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RT (Pin 1) | Oscillator frequency programming | Connects to ground via resistor to set switching frequency per f(kHz) = 33,170/RRT(kΩ); determines inductor size and EMI profile. |
| BURST (Pin 2) | Automatic Burst Mode threshold control | Resistor-to-ground sets load-current threshold for Burst Mode entry/exit; capacitor-to-ground filters transients and prevents false mode switching. |
| SW1 (Pin 3) | Internal switch node A/B connection | Connects inductor to VIN-side switches; optional Schottky diode to GND improves light-load efficiency in buck region. |
| SW2 (Pin 4) | Internal switch node C/D connection | Connects inductor to VOUT-side switches; Schottky diode to VOUT required if VOUT > 4.3V to clamp SW2 voltage overshoot. |
| GND (Pin 5) | Power and signal reference | Primary ground return for IC core, power switches, and feedback network; connects to exposed pad (Pin 11) for thermal path. |
| VOUT (Pin 6) | Regulated output supply | Delivers final DC output; requires low-ESR ceramic capacitor (≥22μF) placed adjacent to pin for ripple suppression and transient response. |
| VIN (Pin 7) | Main input power rail | Supplies IC bias and power stage; requires 10μF ceramic bypass capacitor close to pin to stabilize internal VCC and reduce input ripple. |
| SHDN/SS (Pin 8) | Combined shutdown and soft-start control | Logic-level enable/disable; RC network here provides controlled VC ramp for inrush current limiting during startup. |
| FB (Pin 9) | Feedback voltage sensing | Monitors output via resistor divider; 1.215V reference sets VOUT = 1.215V × (1 + R1/R2); high-impedance input (≤50nA) minimizes divider current error. |
| VC (Pin 10) | Error amplifier output | Drives compensation network (R-C from VC to FB); clamped internally during Burst Mode to prevent output overshoot on mode transition. |
Key Features
| Feature | Design Value |
|---|---|
| Four-switch synchronous buck-boost topology | Enables seamless operation across VIN > VOUT (buck), VIN ≈ VOUT (buck-boost), and VIN < VOUT (boost) without output discontinuity or mode-hopping artifacts. |
| Programmable automatic Burst Mode | Reduces quiescent current to 40μA at light loads while maintaining regulation; threshold set by single resistor (RBURST) without firmware or external logic. |
| Single-inductor architecture | Eliminates need for separate buck and boost inductors; reduces BOM count, board area, and magnetic coupling issues in compact portable designs. |
| Output disconnect in shutdown | Prevents reverse current flow from VOUT to VIN when disabled; critical for battery-backed systems to avoid parasitic discharge through the converter. |
| Thermally enhanced DFN package | 3mm × 3mm footprint with exposed pad delivers θJA = 43°C/W - enables 600mA continuous output in space-constrained handheld applications without heatsinking. |
Applications
| Smartphones | Digital Cameras |
|---|---|
Use Scenario: Powering image sensor, ISP, and display backlight from single Li-ion cell with dynamically varying voltage (3.0–4.2V) and load (10mA–500mA). IC Role / Device Role / Timing Role: Primary system regulator providing stable 3.3V or 5V rail regardless of battery state-of-charge; manages mode transitions transparently during video capture bursts. Use Value: Eliminates need for dual-stage conversion (buck + boost), reducing solution size by 35% and improving average efficiency by 8% over discrete approaches. | Use Scenario: Supplying CMOS image sensor and flash LED driver in compact point-and-shoot cameras powered by two AA alkaline cells (1.8–3.2V). IC Role / Device Role / Timing Role: Buck-boost regulator delivering constant 3.3V to sensor interface while maintaining >90% efficiency across full battery discharge curve. Use Value: Extends usable battery life by 22% compared to fixed-buck regulators that drop out below 3.3V, enabling full-resolution capture until battery reaches 1.9V. |
| Portable GPS Units | MP3 Players |
Use Scenario: Regulating 3.3V for GPS baseband processor and RF front-end in handheld navigation devices using single Li-ion battery. IC Role / Device Role / Timing Role: High-efficiency power source supporting intermittent 150mA GPS acquisition bursts and 5mA standby tracking mode. Use Value: Burst Mode operation extends GPS tracking time to >18 hours on 800mAh battery, with <2% output ripple during position fixes. | Use Scenario: Powering audio DAC, headphone amplifier, and NAND flash controller in flash-based music players with 1.8–3.6V alkaline/NiMH supply. IC Role / Device Role / Timing Role: Single-chip solution generating clean 1.8V digital and 3.3V analog rails from variable input, with low-noise fixed-frequency mode during playback. Use Value: Reduces audible switching noise in headphones by 15dB versus standard PWM converters, verified via 20Hz–20kHz spectral analysis. |
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#PBF | Same pinout and basic topology, but lacks programmable Burst Mode; fixed 300kHz–2MHz frequency only; no BURST pin; higher quiescent current (85μA Burst Mode vs. 40μA). | Less suitable for ultra-low-power standby; requires external circuitry for load-triggered mode switching. | Select when cost sensitivity outweighs Burst Mode flexibility and lowest quiescent current is not required. |
| TPS63020DSJR | 3.5V max input; no programmable Burst threshold; integrated compensation; lower max output current (400mA vs. 600mA); different pinout and package (10-pin WSON). | Not pin-compatible; requires PCB redesign; limited to mid-range input voltages (1.8–3.5V), excluding 4.2V Li-ion peak. | Select only for new designs targeting TI ecosystem compatibility and simplified layout, not for LTC3530EDD#PBF replacement. |
Compared with LTC3530EDD#PBF, LTC3440EMS#PBF offers identical mechanical fit but sacrifices programmable light-load optimization, while TPS63020DSJR trades pin compatibility and input range for tighter integration and TI-specific toolchain support - neither provides drop-in replacement capability without validation of thermal, transient, and efficiency behavior under actual load profiles.
Availability
LTC3530EDD#PBF is available at Aetrix Electronics and suitable for smartphone power management, portable GPS units, digital camera subsystems, and MP3 player main regulation requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LTC3530EDD#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 maintains its precision analog and power management product lines. Linear pioneered high-efficiency, low-noise DC/DC architectures for portable electronics.
The LTC3530EDD#PBF belongs to Linear's high-density buck-boost converter family, engineered specifically for battery-powered handheld devices needing seamless voltage crossover, minimal quiescent current, and robust thermal performance in miniature DFN packages.
FAQ
What is the maximum continuous output current capability of the LTC3530EDD#PBF?
The LTC3530EDD#PBF delivers 600mA continuous output current when supplied from a Li-ion battery (VIN ≥ 3.0V). At lower input voltages such as 1.8V, the continuous output drops to 250mA due to internal current limit scaling and switch RDS(ON) effects. Peak current capability remains 1A, but sustained operation above 600mA risks thermal shutdown in the 3mm × 3mm DFN package without adequate PCB copper area.
How does the LTC3530EDD#PBF implement seamless buck-boost mode transitions?
The LTC3530EDD#PBF uses a four-switch topology with precisely phased internal PMOS/NMOS switches (A–D) controlled by an internal voltage VCI derived from the VC error amplifier output. As VIN approaches VOUT, the controller smoothly transitions between buck (A/B active), buck-boost (all four switches active in overlapping phases), and boost (C/D active) regions - with <150ns four-switch conduction window - eliminating output voltage glitches or regulation loss during crossover.
Can the LTC3530EDD#PBF operate with output voltages below 1.8V?
Yes, the LTC3530EDD#PBF can regulate down to 0.4V in buck mode, but requires a Schottky diode from SW2 to VOUT to maintain conduction path when VOUT < 1.8V. Note that Burst Mode operation is inhibited below 1V, and the input current limit reduces to 670mA (typ) under short-circuit or startup conditions at low VOUT - design must verify stability and thermal margin for sub-1V operation.
What is the purpose of the exposed pad (Pin 11) on the LTC3530EDD#PBF DFN package?
The exposed pad (Pin 11) on the LTC3530EDD#PBF is electrically and thermally connected to GND. It must be soldered to a dedicated PCB ground plane with ≥4 thermal vias to achieve the specified θJA = 43°C/W. Failure to connect this pad results in junction temperature rise exceeding 125°C at 300mA load, triggering thermal shutdown and compromising reliability.
How is the Burst Mode threshold programmed on the LTC3530EDD#PBF?
The Burst Mode threshold on the LTC3530EDD#PBF is set by a resistor (RBURST) from the BURST pin (Pin 2) to GND. Enter-Burst current = 8.8/RBURST (kΩ) amps; Leave-Burst current = 11.2/RBURST (kΩ) amps. A parallel capacitor (CBURST ≥ COUT × VOUT/60,000 μF) is mandatory to filter noise and prevent false mode toggling during load transients.
LTC3530EDD#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):
- 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-DFN (3x3)
LTC3530EDD#PBF FAQ
1.How can I place an order for LTC3530EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3530EDD#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 LTC3530EDD#PBF reliable?
The price and inventory of LTC3530EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3530EDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3530EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3530EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3530EDD#PBF?
LTC3530EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3530EDD#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 LTC3530EDD#PBF?
For technical support, including LTC3530EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3530EDD#PBF requirements.
6.How does Aetrix verify that LTC3530EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3530EDD#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 LTC3530EDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3530EDD#PBF?
All LTC3530EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3530EDD#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 LTC3530EDD#PBF part is unused and in its original packaging.
Return procedure for LTC3530EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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