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Analog Devices Inc. LTC3534EDHC#PBF
- Part No.:
- LTC3534EDHC#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3534EDHC#PBF.pdf
- Description:
- IC REG BUCK BST ADJ 500MA 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,158
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Product details
Overview
LTC3534EDHC#PBF from Analog Devices (formerly Linear Technology) is a wide-input synchronous buck-boost DC/DC converter IC designed for single-cell Li-ion, multi-cell alkaline/NiMH battery-powered systems where input voltage may fall above, below, or equal to the regulated output. It delivers up to 500mA at 5V from 4 AA cells (3.6–6.4V), features 1MHz fixed-frequency switching, 25µA Burst Mode quiescent current, and operates across 2.4V–7V input and 1.8V–7V output ranges.
For engineers reviewing the LTC3534EDHC#PBF datasheet, LTC3534EDHC#PBF pinout, LTC3534EDHC#PBF application, or LTC3534EDHC#PBF equivalent, key selection criteria include its four-switch topology enabling seamless buck/buck-boost/boost mode transitions, programmable soft-start via RUN/SS, user-selectable Burst Mode vs PWM operation, and thermal performance in the 16-lead 3mm × 5mm DFN package with exposed PGND pad.
Technical Context
The LTC3534EDHC#PBF implements a proprietary four-switch synchronous buck-boost topology with continuous transfer function across operating modes-buck (VIN > VOUT), buck-boost (VIN ≈ VOUT), and boost (VIN < VOUT)-controlled by internal voltage VCI. Its voltage-mode error amplifier drives VC to regulate output via feedback at FB with 1V reference.
It integrates dual current-limit circuits: an average input current limit (1.8A typical, folding to 800mA during start-up/short-circuit) and a high-speed peak current comparator (2.6A typical, 50ns response). Reverse current limiting (500mA) enforces forced CCM in PWM mode, while Burst Mode disables switching to reduce IQ to 25µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.4V to 7V - supports 4xAA (3.6–6.4V), single Li-ion (2.7–4.2V), or USB 5V input without external LDO pre-regulation. |
| Output Voltage Range | 1.8V to 7V - adjustable via resistor divider on FB; 5V output at 500mA demonstrated in typical application. |
| Switching Frequency | 1MHz ±15% - enables use of compact 4.7–5µH inductors and low-ESR ceramic output capacitors (e.g., 22µF). |
| Burst Mode IQ | 25µA typical - extends battery runtime in portable devices operating at light loads (<100mA). |
| Shutdown Current | <1µA - ensures minimal drain during system sleep or storage. |
| Efficiency | Up to 94% - achieved via synchronous rectification with NMOS/PMOS switch RDS(ON) of 215–275mΩ and 260mΩ respectively. |
| Thermal Package | 16-lead 3mm × 5mm DFN (DHC) with exposed PGND pad - θJC = 4°C/W enables high-power density layout with PCB copper thermal spreading. |
Pinout & Package
Package: 16-lead plastic DFN (DHC), 3mm × 5mm × 0.75mm, exposed thermal pad (Pin 17) connected to PGND. Requires soldering of exposed pad and pins 1, 8, 9, 16 (GN package note does not apply; DHC uses different pin mapping).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 3, 8, 9, 16) | Signal ground reference | Provides low-noise return path for error amp, feedback, and logic; must be isolated from power ground planes except at single-point connection. |
| FB (Pin 15) | Feedback input | Connects to resistor divider tap; senses output voltage against 1.000V internal reference (±1.5% over temp); input bias current ≤50nA. |
| VC (Pin 14) | Error amplifier output | Drives compensation network (R-C from VC to FB); clamped during soft-start; disconnected in Burst Mode to prevent drift. |
| VIN (Pin 13) | Main input supply | Supplies bias circuitry; requires local 10µF ceramic bypass to PGND1/PGND2; separate from high-current PVIN path. |
| PVIN (Pin 12) | Power input supply | High-current path for switch drivers; must be decoupled with 10µF ceramic capacitor directly to PGND pins (4, 7). |
| VOUT (Pin 11) | Regulated output | Delivers switched output; requires low-ESR ceramic capacitor (≥22µF) placed adjacent to VOUT and GND pins. |
| PWM (Pin 10) | Burst Mode control | Logic-level input: <0.4V enables Burst Mode (low IQ), >1.4V forces fixed-frequency PWM (low noise); 1.25–2.5µA input current. |
| RUN/SS (Pin 2) | Enable + soft-start | 0.4–1.4V threshold; <0.4V shuts down IC; >2.4V releases VC clamp for full regulation; RC network sets soft-start ramp time. |
| SW1 (Pin 5), SW2 (Pin 6) | Inductor switch nodes | Connect opposite ends of single inductor; high di/dt paths requiring short, wide traces and minimized loop area to reduce EMI. |
| PGND1, PGND2 (Pins 4, 7) | Power ground returns | Return paths for NMOS switches B and C; must be tied to exposed pad and routed separately from signal GND to avoid noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Four-switch synchronous topology | Enables continuous, seamless regulation across VIN > VOUT, VIN ≈ VOUT, and VIN < VOUT without mode-hopping artifacts or output glitches. |
| User-selectable Burst Mode / PWM | Reduces light-load IQ from 420µA (active) to 25µA (Burst) while maintaining regulation; selectable via logic-level PWM pin without external components. |
| Programmable soft-start | Integrated RUN/SS pin accepts RC network to control VC ramp rate, preventing inrush current and output overshoot during power-up. |
| Reverse current limiting | 500mA hard limit on negative inductor current in PWM mode prevents reverse conduction through PMOS D, ensuring forced CCM and predictable loop behavior. |
| Thermally enhanced DFN package | Exposed PGND pad (Pin 17) provides 4°C/W junction-to-case thermal resistance, supporting 500mA continuous output in compact layouts. |
Applications
| Portable Barcode Readers | USB to 5V Supply |
|---|---|
Use Scenario: Handheld scanner powered by 4×AA batteries with variable voltage (3.6–6.4V) and 5V USB peripheral interface requirement. IC Role / Device Role / Timing Role: Primary buck-boost regulator delivering stable 5V/500mA output regardless of battery state-of-charge. Use Value: Eliminates need for separate boost-only and buck-only converters; maintains USB compliance across full battery discharge curve. |
Use Scenario: Embedded device drawing power from USB host (5V) but requiring regulated 5V rail tolerant of USB cable drop and source variation. IC Role / Device Role / Timing Role: Regulator with input range extending down to 2.4V, providing robust 5V output even under marginal USB port conditions. Use Value: Compensates for up to 1.5V IR drop in long/low-gauge USB cables while sustaining 500mA load without brownout. |
| Handheld GPS Receivers | Portable Inventory Terminals |
Use Scenario: Battery-powered GPS unit using single Li-ion cell (2.7–4.2V) needing clean, low-noise 3.3V or 5V supply for RF front-end and baseband processor. IC Role / Device Role / Timing Role: Synchronous buck-boost converter operating in buck-boost region near battery midpoint to minimize switching losses. Use Value: Achieves >92% efficiency at 300mA across 3.0–4.0V input, reducing thermal load and extending runtime between charges. |
Use Scenario: Ruggedized inventory terminal with alkaline primary battery pack (4×AA, 3.6–6.4V) powering 3.3V logic and 5V display backlight. IC Role / Device Role / Timing Role: Dual-output capable regulator (via external divider) supplying both rails from single inductor topology. Use Value: Reduces BOM count and PCB area versus discrete buck + boost solutions while maintaining independent voltage accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63020DSJR | Lower max output current (3A vs 0.5A), wider input (1.8–6.5V), integrated 2.5A switches, no Burst Mode (only PFM/PWM). | Targets higher-current apps (e.g., tablets); lacks ultra-low-IQ Burst Mode for sub-100mA battery life optimization. | Select when >1A output or smaller solution size is critical; avoid if 25µA IQ or seamless VIN≈VOUT transition is required. |
| MAX77827AEWE+T | Higher integration (I²C programmable VOUT, enable, fault reporting), 2.5A capability, 2.5–5.5V input, no Burst Mode, 1.2MHz switching. | Designed for smartphone/tablet PMIC subsystems; requires digital control interface and offers no analog PWM/Burst select pin. | Choose for I²C-configurable systems needing telemetry; not suitable for standalone analog control or ultra-low-IQ portable designs. |
Compared with TPS63020DSJR and MAX77827AEWE+T, the LTC3534EDHC#PBF uniquely combines 25µA Burst Mode IQ, true 2.4–7V input flexibility, and pin-controlled mode selection-making it optimal for cost-sensitive, battery-constrained handhelds where analog simplicity and deep-sleep efficiency are prioritized over digital configurability or high current.
Availability
LTC3534EDHC#PBF is available at Aetrix Electronics and suitable for portable barcode readers, handheld GPS receivers, USB-powered peripherals, and medical instrumentation requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3534EDHC#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 full product support, datasheets, and design resources for legacy Linear parts including the LTC3534 series.
The LTC3534 belongs to Linear's high-efficiency, wide-input buck-boost converter family targeting battery-powered portable electronics where input voltage varies across the output setpoint-designed specifically to replace inefficient SEPIC or cascaded buck-boost solutions.
FAQ
What is the minimum input voltage required to start up the LTC3534EDHC#PBF?
The LTC3534EDHC#PBF has a guaranteed start-up voltage of 2.4V, with typical operation beginning at 2.2V. This allows reliable turn-on from partially discharged 4×AA alkaline cells or low-voltage Li-ion batteries. The absolute maximum rating for VIN is 8V, but sustained operation above 7V is not specified.
How does the LTC3534EDHC#PBF handle transitions between buck, buck-boost, and boost modes?
The LTC3534EDHC#PBF uses an internal control voltage (VCI) derived from the VC pin to phase four internal switches continuously. As VIN crosses VOUT, the duty cycle shifts smoothly without mode-hopping-entering the four-switch buck-boost region at ~0.875×VOUT and exiting at ~1.15×VOUT-ensuring zero output disturbance during transitions.
Can the LTC3534EDHC#PBF regulate output voltages below 1.8V?
The LTC3534EDHC#PBF is specified for 1.8V–7V output, but can operate down to 400mV in buck mode with external Schottky diode from SW2 to VOUT. Below 1.8V, RDS(ON) of synchronous switch D increases significantly, and Burst Mode is disabled below 1.6V; current limit folds back to 800mA below 0.9V.
What is the purpose of the exposed pad (Pin 17) on the LTC3534EDHC#PBF DFN package?
The exposed pad (Pin 17) on the LTC3534EDHC#PBF is electrically and thermally connected to PGND. It must be soldered to a dedicated PCB copper pour tied to PGND planes to achieve θJC = 4°C/W and ensure safe operation at 500mA. Leaving it unconnected risks thermal shutdown and reduced reliability.
Does the LTC3534EDHC#PBF require external compensation components?
Yes-the LTC3534EDHC#PBF requires external compensation components (R-C network from VC to FB) to stabilize the voltage-mode control loop. Type I or Type III networks are supported; Type III is recommended for best transient response. Component values depend on selected inductor, output capacitor, and operating region (buck/boost).
LTC3534EDHC#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-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):
- 7V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- 7V
- Current - Output:
- 500mA
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DFN (5x3)
LTC3534EDHC#PBF FAQ
1.How can I place an order for LTC3534EDHC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3534EDHC#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 LTC3534EDHC#PBF reliable?
The price and inventory of LTC3534EDHC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3534EDHC#PBF is usually 5 days.
3.What payment methods are accepted for LTC3534EDHC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3534EDHC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3534EDHC#PBF?
LTC3534EDHC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3534EDHC#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 LTC3534EDHC#PBF?
For technical support, including LTC3534EDHC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3534EDHC#PBF requirements.
6.How does Aetrix verify that LTC3534EDHC#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3534EDHC#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 LTC3534EDHC#PBF meets industry standards.
7.What is the process for return or replacement of LTC3534EDHC#PBF?
All LTC3534EDHC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3534EDHC#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 LTC3534EDHC#PBF part is unused and in its original packaging.
Return procedure for LTC3534EDHC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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