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Analog Devices Inc. LTC3534EGN#TRPBF
- Part No.:
- LTC3534EGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3534EGN#TRPBF.pdf
- Description:
- IC REG BUCK BST ADJ 500MA 16SSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC3534EGN#TRPBF from Analog Devices (formerly Linear Technology) is a wide-input, synchronous buck-boost DC/DC converter IC designed for 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 (3.6V–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 LTC3534EGN#TRPBF datasheet, LTC3534EGN#TRPBF pinout, LTC3534EGN#TRPBF application, or LTC3534EGN#TRPBF equivalent, key selection criteria include its four-switch topology enabling seamless mode transition, programmable soft-start via RUN/SS, user-selectable Burst Mode vs PWM operation, and thermal performance in the 16-lead SSOP narrow package.
Technical Context
The LTC3534EGN#TRPBF implements a proprietary four-switch buck-boost topology with continuous transfer function across buck, buck-boost, and boost regions-controlled by internal voltage VCI thresholds (100mV, 640mV, 720mV, ~1.2V). Its voltage-mode error amplifier drives VC to regulate output, with loop compensation configured externally between FB and VC.
It integrates dual current-limit circuits: an average input current limit (1.8A typical, folding back to 800mA during start-up or short-circuit) and a high-speed peak current comparator (2.6A typical, 50ns response). Reverse current limiting (500mA typical) prevents negative inductor current in forced CCM during PWM mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.4V to 7V - supports multi-cell alkaline/NiMH or single Li-ion batteries without external pre-regulation |
| Output Voltage Range | 1.8V to 7V - adjustable via resistor divider on FB pin; reference voltage = 1.000V ±15mV |
| Max Output Current | 500mA at 5V - achievable across full VIN range (3.6V–6.4V) in PWM mode with proper layout and thermal management |
| Quiescent Current | 25µA in Burst Mode - extends battery runtime in portable devices operating at light loads |
| Switching Frequency | 1MHz ±15% - enables use of compact 4.7µH–5µH inductors and low-ESR ceramic output capacitors |
| Efficiency | Up to 94% - achieved via synchronous rectification with NMOS/PMOS switch RDS(ON) ≤275mΩ |
| Shutdown Current | <1µA - ensures near-zero power drain when disabled via RUN/SS pin <0.4V |
Pinout & Package
The LTC3534EGN#TRPBF is housed in a 16-lead plastic SSOP narrow (GN) package, 5.0mm × 4.4mm × 1.1mm, with exposed thermal pad connected to PGND. Pins 1, 8, 9, and 16 are PGND and must be soldered to PCB ground for electrical integrity and thermal dissipation (θJA = 90°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1,3,8,9,16) | Signal Ground / Substrate Ground | Pins 1,8,9,16 are PGND; Pin 3 is signal ground - separate grounding paths reduce noise coupling into feedback loop |
| RUN/SS (2) | Enable & Soft-Start Control | Voltage <0.4V disables IC; >1.4V enables; RC network here controls VC ramp rate for controlled output rise |
| PGND1, PGND2 (4,7) | Power Ground Return Paths | Dedicated low-impedance returns for NMOS switches B and C - minimize ground bounce during high di/dt switching |
| SW1 (5), SW2 (6) | Internal Switch Node Connections | Connect external inductor between SW1 and SW2; short traces essential to limit EMI and voltage spikes |
| PWM (10) | Burst Mode Select Input | Logic-low (<0.4V) enables Burst Mode; logic-high (>1.4V) forces fixed-frequency PWM operation |
| VOUT (11) | Regulated Output Terminal | Delivers regulated output; requires local 10µF–22µF ceramic capacitor to GND for stability and transient response |
| PVIN (12) | Power Input Supply | Supplies gate drivers and internal circuitry; bypass with 10µF ceramic capacitor to PGND for low-impedance high-frequency return |
| VIN (13) | Main Input Power Source | Primary input connection; routed separately from PVIN to avoid noise injection into control circuitry |
| VC (14) | Error Amplifier Output | Drives external compensation network (R-C from VC to FB); clamped during soft-start and Burst Mode |
| FB (15) | Feedback Input | Monitors output via resistor divider; 1V reference enables precise output setting from 1.8V to 7V |
Key Features
| Feature | Design Value |
|---|---|
| Four-Switch Buck-Boost Topology | Enables continuous regulation across VIN > VOUT, VIN ≈ VOUT, and VIN < VOUT without mode-hopping artifacts or output discontinuity |
| Programmable Burst Mode Operation | User-selectable via PWM pin; reduces IQ to 25µA while maintaining regulation - critical for battery life in standby applications |
| Integrated Protection Functions | Includes thermal shutdown, short-circuit protection, reverse current limiting (500mA), and foldback current limit (800mA at low VOUT) |
| Soft-Start with RUN/SS Pin | Combined enable/shutdown and soft-start function - eliminates inrush current and output overshoot during power-up |
| Thermally Enhanced SSOP Package | 16-lead GN package with multiple PGND pins and exposed substrate ground - supports 500mA continuous output with standard 4-layer PCB |
Applications
| Medical Instruments | Portable Barcode Readers |
|---|---|
Use Scenario: Handheld blood glucose meters and portable pulse oximeters powered by two or three AA/AAA cells. IC Role / Device Role / Timing Role: Primary voltage regulator delivering stable 3.3V or 5V from declining battery voltage (0.9V–4.5V per cell). Use Value: Maintains consistent sensor bias and microcontroller operation across full battery discharge curve without brownouts. | Use Scenario: Ruggedized industrial barcode scanners using 4×AA alkaline cells in cold-storage environments. IC Role / Device Role / Timing Role: Synchronous buck-boost converter generating 5V USB-compliant power for imager and interface ICs. Use Value: Delivers 500mA at 5V even at 3.6V input (cold battery), eliminating need for battery replacement mid-shift. |
| USB to 5V Supply | Handheld GPS Receivers |
Use Scenario: Portable USB host adapters converting single-cell Li-ion (2.7V–4.2V) to regulated 5V for USB peripherals. IC Role / Device Role / Timing Role: High-efficiency DC/DC converter with output disconnect in shutdown - prevents battery drain when USB port is inactive. Use Value: Achieves >90% efficiency across entire input range, extending usable runtime beyond linear regulators or charge pumps. | Use Scenario: Battery-powered hiking GPS units requiring reliable 3.3V supply for RF front-end and baseband processor. IC Role / Device Role / Timing Role: Core power management IC regulating 3.3V from 2×LiFePO₄ (3.2V–3.6V) or 3×NiMH (3.0V–4.2V). Use Value: Seamless transition between buck and boost modes avoids GPS signal loss during battery voltage sag under RF transmit load. |
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 | 3.5V–12V input; 1.2V–5.5V output; 2A max output; integrated MOSFETs with lower RDS(ON); no Burst Mode - uses PFM/PWM hybrid | Higher output current capability but narrower VOUT adjust range; lacks user-controllable Burst Mode entry/exit | Select for higher-current applications where 2A output and smaller solution size outweigh need for ultra-low-IQ light-load operation |
| MAX77827AEWA+T | 2.5V–5.5V input; 2.6V–5.2V output; 2.5A max; I²C programmable; integrated load switch; no manual Burst Mode control | Designed for smartphone/tablet PMIC subsystems; requires digital interface; not suited for standalone analog control | Select when system-level power sequencing, dynamic voltage scaling, or I²C configurability are required over direct pin-controlled operation |
Compared with TPS63020DSJR and MAX77827AEWA+T, the LTC3534EGN#TRPBF offers deterministic, pin-controlled Burst Mode activation, wider input/output voltage flexibility (2.4V–7V), and proven robustness in industrial handheld designs - making it optimal for analog-centric, battery-life-sensitive applications without digital control overhead.
Availability
LTC3534EGN#TRPBF is available at Aetrix Electronics and suitable for medical instrumentation, portable data capture terminals, and handheld GPS receivers requiring stable component supply with long-term manufacturability and consistent parametric performance.
Supply support for LTC3534EGN#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 precision analog and power management product lines with full technical documentation and long-term support.
The LTC3534EGN#TRPBF belongs to Linear's high-efficiency DC/DC converter family, engineered specifically for battery-powered portable equipment needing seamless input-to-output voltage conversion without external complexity.
FAQ
What is the minimum input voltage required for the LTC3534EGN#TRPBF to start switching?
The LTC3534EGN#TRPBF has a guaranteed start-up voltage of 2.4V, with typical operation beginning at 2.2V. Below this threshold, the UVLO circuit prevents switching to protect against unstable regulation. This allows reliable startup from partially discharged alkaline or NiMH batteries, such as three AA cells at end-of-life (~2.7V total).
Can the LTC3534EGN#TRPBF regulate output voltages below 1.8V?
The LTC3534EGN#TRPBF is specified for 1.8V–7V output, but can operate down to 400mV in buck-only mode with external Schottky diode from SW2 to VOUT. However, Burst Mode is inhibited below 1.6V, current limit folds back to 800mA below 0.9V, and RDS(ON) of synchronous switch D increases significantly - limiting practical use below 1.8V.
How does the RUN/SS pin control soft-start and shutdown on the LTC3534EGN#TRPBF?
The RUN/SS pin combines both functions: voltage <0.4V shuts down the LTC3534EGN#TRPBF (<1µA IQ); voltage >1.4V enables operation; and an RC network from this pin to GND ramps VC to control output voltage rise time. To fully release soft-start clamping, RUN/SS must exceed 2.4V - ensuring stable regulation before Burst Mode is enabled.
What is the purpose of the separate PVIN and VIN pins on the LTC3534EGN#TRPBF?
PVIN supplies high-current gate drivers and internal power circuits, while VIN feeds the main power stage. Separating them minimizes noise coupling: PVIN is bypassed directly to PGND with a 10µF ceramic capacitor for clean high-frequency return, whereas VIN connects to the battery or source with minimal trace inductance. This isolation improves EMI performance and regulation accuracy.
Does the LTC3534EGN#TRPBF require external Schottky diodes for optimal efficiency?
Schottky diodes across NMOS switches B and D are optional but recommended for highest efficiency - they conduct during the 15ns break-before-make interval, reducing conduction loss. Diodes like MBRM120T3 improve light-load efficiency by ~1–2%, especially in Burst Mode. Standard rectifiers must be avoided due to slow recovery causing shoot-through losses.
LTC3534EGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- 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):
- 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-SSOP
LTC3534EGN#TRPBF FAQ
1.How can I place an order for LTC3534EGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3534EGN#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 LTC3534EGN#TRPBF reliable?
The price and inventory of LTC3534EGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3534EGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3534EGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3534EGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3534EGN#TRPBF?
LTC3534EGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3534EGN#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 LTC3534EGN#TRPBF?
For technical support, including LTC3534EGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3534EGN#TRPBF requirements.
6.How does Aetrix verify that LTC3534EGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3534EGN#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 LTC3534EGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3534EGN#TRPBF?
All LTC3534EGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3534EGN#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 LTC3534EGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC3534EGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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