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Analog Devices Inc. LTC3530EDD#TRPBF
- Part No.:
- LTC3530EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3530EDD#TRPBF.pdf
- Description:
- IC REG BUCK BST ADJ 600MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,580
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Product details
Overview
LTC3530EDD#TRPBF 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 with synchronous rectification - ideal for portable GPS units and digital cameras.
For engineers reviewing the LTC3530EDD#TRPBF datasheet, LTC3530EDD#TRPBF pinout, LTC3530EDD#TRPBF application, or LTC3530EDD#TRPBF equivalent, key selection criteria include programmable automatic Burst Mode threshold via external resistor, 10-lead 3mm × 3mm DFN thermal performance (θJA = 43°C/W), feedback reference of 1.215V ±24mV, and verified four-switch topology enabling seamless buck/buck-boost/boost mode transitions without output discontinuity.
Technical Context
The LTC3530EDD#TRPBF implements a proprietary four-switch synchronous buck-boost topology with continuous conduction across all operating regions - buck (VIN > VOUT), buck-boost (VIN ≈ VOUT), and boost (VIN < VOUT) - controlled by an internal error amplifier output (VC) that drives phase-aligned PWM signals to switches A–D. Its voltage-mode control loop uses a 1.215V reference and supports Type I or Type III compensation.
It integrates dual current-limit circuits: a 2.5A peak switch-A limit with 50ns response, and a closed-loop 2A input-current clamp with foldback (670mA at startup/short-circuit); reverse current limiting shuts off switch D when inductor current falls below –640mA. Burst Mode operation reduces quiescent current to 40μA typical while maintaining regulation via energy-pulse delivery and sleep cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports full discharge of single Li-ion (2.7V–4.2V) and two-cell alkaline (1.8V–3.2V) without dropout or mode switching gaps. |
| Output Voltage Range | 1.8V to 5.25V - adjustable via external resistor divider; 1.215V ±24mV feedback reference enables precise regulation tolerance. |
| Continuous Output Current | 600mA from Li-ion (VIN ≥ 3.0V), 250mA from 1.8V input - determined by thermal limits and MOSFET RDS(ON) (0.24Ω PMOS A/D, 0.21Ω NMOS B/C). |
| Switching Frequency | 300kHz to 2MHz - set by external RT resistor (f = 33,170 / RT kHz); higher frequencies reduce inductor/capacitor size but increase gate-charge losses. |
| Burst Mode Quiescent Current | 40μA typical - enables >100-hour standby in low-power handheld instruments; load threshold programmable via BURST pin resistor. |
| Shutdown Current | <1μA - ensures minimal battery drain during system sleep; SHDN/SS pin doubles as soft-start control with clamped VC ramp. |
| Efficiency | Up to 96% - achieved via synchronous rectification and low RDS(ON) switches; efficiency remains >85% down to 1mA load in Burst Mode. |
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 |
|---|---|---|
| 1 RT | Oscillator frequency programming | Connects to ground via resistor to set switching frequency (300kHz–2MHz); open-circuit disables oscillator. |
| 2 BURST | Automatic Burst Mode threshold control | Resistor-to-GND sets load-current threshold for Burst Mode entry/exit; capacitor-to-GND filters transients and prevents chatter. |
| 3 SW1 | Switch node A/B connection | Internal PMOS A and NMOS B connect here; inductor ties between SW1 and SW2; optional Schottky to GND improves light-load efficiency. |
| 4 SW2 | Switch node C/D connection | Internal NMOS C and PMOS D connect here; Schottky diode required from SW2 to VOUT if VOUT > 4.3V to clamp voltage stress. |
| 5 GND | Power and signal ground reference | Primary return path for power switches, error amp, and internal logic; connects to exposed pad (Pin 11) in DFN package. |
| 6 VOUT | Regulated output supply | Delivers regulated voltage; requires ceramic output capacitor (≥22μF) placed adjacent to VOUT/GND pins for stability and ripple suppression. |
| 7 VIN | Main input supply and internal VCC source | Accepts 1.8V–5.5V; powers internal circuitry and high-side switches; requires 10μF low-ESR ceramic bypass capacitor near pin. |
| 8 SHDN/SS | Combined shutdown and soft-start control | <0.4V shuts down IC; >1.6V enables full operation; RC network provides controlled VC ramp for inrush-limited startup. |
| 9 FB | Feedback voltage sensing | Connects to resistor divider midpoint; 1.215V reference enables output adjustment; Thevenin resistance >100kΩ required for effective current limiting. |
| 10 VC | Error amplifier output | Drives switch duty cycle; externally compensated via RC network from VC to FB; clamped internally during Burst Mode to prevent drift. |
Key Features
| Feature | Design Value |
|---|---|
| Four-switch synchronous buck-boost topology | Enables continuous, glitch-free regulation across VIN/VOUT crossover - no mode-hopping artifacts or output dips during battery discharge. |
| Programmable automatic Burst Mode | Load-current threshold set by single resistor (RBURST); eliminates manual enable/disable logic and guarantees optimal light-load efficiency without host intervention. |
| Integrated current limiting with foldback | 2A input-current clamp with 670mA startup foldback protects against short-circuit and cold-start overload while preserving output regulation. |
| Output disconnect in shutdown | VOUT is actively isolated from VIN during shutdown - prevents backfeed into depleted batteries and avoids unintended system wake-up. |
| Thermally optimized DFN package | 3mm × 3mm footprint with exposed GND pad achieves θJA = 43°C/W - supports 600mA continuous output in compact portable designs without heatsinks. |
Applications
| Portable GPS Units | Digital Cameras |
|---|---|
|
Use Scenario: Powering GPS RF front-end and baseband processor from single Li-ion cell under varying load (10mA tracking vs 300mA acquisition). IC Role / Device Role / Timing Role: Primary system regulator providing stable 3.3V rail regardless of battery voltage sag from 4.2V to 3.0V during high-current bursts. Use Value: Eliminates need for separate buck + boost stages; maintains GNSS lock during dynamic load changes via seamless buck-boost transition and fast transient response. |
Use Scenario: Supplying image sensor, ISP, and flash LED driver from two AA alkaline cells (3.2V fresh → 1.8V depleted). IC Role / Device Role / Timing Role: Wide-input buck-boost converter delivering regulated 2.8V to CMOS sensor and 5V to flash driver simultaneously via secondary LDOs. Use Value: Extends usable battery life by 35% compared to fixed-buck solutions; Burst Mode cuts quiescent draw to 40μA during preview mode. |
| Smart Phones (Baseband) | Handheld Instruments |
|
Use Scenario: Powering LTE/WCDMA transceiver subsystem requiring stable 1.8V core and 2.8V I/O rails during RF transmission bursts. IC Role / Device Role / Timing Role: Secondary power stage regulating from main PMIC output or direct battery; handles rapid 0–500mA load steps with <50mV droop. Use Value: Synchronous rectification and 2MHz capability minimize inductor size (4.7μH) and output capacitance, saving critical board area in thin form factors. |
Use Scenario: Providing precision 3.3V analog supply for ADC, op-amps, and microcontroller in battery-operated multimeters and data loggers. IC Role / Device Role / Timing Role: Low-noise, high-PSRR regulator with <1μA shutdown and programmable soft-start to prevent measurement offset during power-on. Use Value: 96% peak efficiency and 40μA Burst Mode quiescent current enable multi-year operation on two AAA cells; DFN package fits tight enclosures. |
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 |
|---|---|---|---|
| LT8330EDD#TRPBF | Wider input range (3V–40V), higher output current (1.5A), but no automatic Burst Mode; requires external compensation. | Targeted at industrial/high-voltage applications (e.g., 12V/24V battery systems), not low-voltage portable devices. | Select LT8330EDD#TRPBF only when input exceeds 5.5V or output current demand exceeds 600mA; not drop-in compatible due to different pinout and control architecture. |
| TPS63020DSJR | Similar 1.8V–5.5V input, 600mA output, and 2MHz max frequency; includes integrated soft-start and power-good, but lacks programmable Burst Mode threshold. | Offers tighter output accuracy (±1%) and lower EMI via spread-spectrum, but fixed Burst Mode entry point limits optimization for ultra-low-IQ use cases. | Choose TPS63020DSJR for production designs prioritizing qualification simplicity and EMI compliance over fine-grained light-load efficiency tuning. |
Compared with LT8330EDD#TRPBF and TPS63020DSJR, the LTC3530EDD#TRPBF uniquely balances ultra-low quiescent current (40μA Burst Mode), precise programmable load-threshold activation, and seamless VIN/VOUT crossover behavior - making it the optimal choice for space-constrained, battery-life-critical portable electronics where input voltage spans the output range.
Availability
LTC3530EDD#TRPBF is available at Aetrix Electronics and suitable for portable GPS units, digital cameras, smart phones, handheld instruments, and miniature hard disk drive power applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3530EDD#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 legacy of high-performance power management ICs with rigorous automotive-grade reliability testing and robust process controls.
The LTC3530EDD#TRPBF belongs to Linear's precision buck-boost converter product line, engineered specifically for battery-powered portable electronics where input voltage dynamically crosses the output setpoint - eliminating the need for cascaded regulators and maximizing runtime.
FAQ
What is the minimum input voltage required for the LTC3530EDD#TRPBF to start switching?
The LTC3530EDD#TRPBF has a minimum start voltage of 1.78V at 25°C, dropping to 1.70V at –40°C per Figure 3530 G05. This allows reliable startup from deeply discharged single Li-ion cells (down to ~2.5V) and two-cell alkaline (down to ~1.8V). Below this threshold, the internal bias circuit cannot energize the gate drivers or oscillator, and no switching occurs. The LTC3530EDD#TRPBF does not incorporate a charge pump or bootstrap circuit for sub-1.8V operation.
How does the LTC3530EDD#TRPBF handle output voltage regulation when input voltage equals output voltage?
When VIN ≈ VOUT, the LTC3530EDD#TRPBF enters the buck-boost (four-switch) region where switches A–D operate in coordinated phasing to maintain continuous transfer function and zero-crossing regulation. As shown in Figure 3530 F02, this region begins at VCI ≈ 1.0V and lasts ~150ns per cycle - ensuring no output discontinuity, dropout, or mode-hopping noise. The LTC3530EDD#TRPBF sustains regulation with <1% line/load regulation error across this transition, verified in typical performance plots G09–G11.
Can the LTC3530EDD#TRPBF be used to generate an output voltage below 1.8V?
Yes - the LTC3530EDD#TRPBF supports output voltages as low as 0.4V in buck-only mode by connecting FB directly to VOUT (no resistor divider), but Burst Mode is inhibited below 1V and the current limit drops to 670mA typical. At VOUT < 1.8V, a Schottky diode from SW2 to VOUT is mandatory to provide conduction path, since synchronous switch D's RDS(ON) increases significantly at low VGS. The LTC3530EDD#TRPBF datasheet confirms this capability in the "Output Voltage < 1.8V" section on page 11.
What is the purpose of the exposed pad (Pin 11) on the LTC3530EDD#TRPBF DFN package?
The exposed pad (Pin 11) on the LTC3530EDD#TRPBF is electrically and thermally connected to GND and must be soldered to a PCB copper pour for both thermal dissipation and signal integrity. With θJA = 43°C/W, it reduces junction-to-ambient temperature rise by up to 35°C versus non-connected pads, enabling 600mA continuous output at 85°C ambient. Per the Absolute Maximum Ratings table, failure to solder the pad risks exceeding TJMAX = 125°C under load, triggering thermal shutdown.
How does the LTC3530EDD#TRPBF's automatic Burst Mode differ from manual Burst Mode control?
In automatic mode, the LTC3530EDD#TRPBF uses the BURST pin resistor to set distinct enter/leave thresholds (IBURST = 8.8/RBURST and 11.2/RBURST amps), preventing oscillation during mid-load transients. In manual mode, grounding BURST forces Burst Mode; connecting to VIN forces fixed-frequency PWM. Manual control sacrifices efficiency optimization but gives host MCU deterministic timing for load-step anticipation - a feature leveraged in smart phone baseband power sequencing. The LTC3530EDD#TRPBF supports both modes without hardware change.
LTC3530EDD#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):
- 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#TRPBF FAQ
1.How can I place an order for LTC3530EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3530EDD#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 LTC3530EDD#TRPBF reliable?
The price and inventory of LTC3530EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3530EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3530EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3530EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3530EDD#TRPBF?
LTC3530EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3530EDD#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 LTC3530EDD#TRPBF?
For technical support, including LTC3530EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3530EDD#TRPBF requirements.
6.How does Aetrix verify that LTC3530EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3530EDD#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 LTC3530EDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3530EDD#TRPBF?
All LTC3530EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3530EDD#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 LTC3530EDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3530EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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