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Analog Devices Inc. LTC3523EUD-2#TRPBF
- Part No.:
- LTC3523EUD-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3523EUD-2#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ DL 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,744
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Product details
Overview
LTC3523EUD-2#TRPBF from Analog Devices (formerly Linear Technology) is a dual synchronous DC/DC converter integrating a 600mA step-up and 400mA step-down regulator in a single 16-lead 3mm × 3mm QFN package. It operates from 1.8V–5.5V input, delivers adjustable outputs (1.8–5.25V up / 0.615–5.5V down), and features 2.4MHz fixed-frequency PWM or pin-selectable Burst Mode for light-load efficiency - used in compact battery-powered systems like GPS navigators and medical handhelds.
For engineers reviewing the LTC3523EUD-2#TRPBF datasheet, LTC3523EUD-2#TRPBF pinout, LTC3523EUD-2#TRPBF application, or LTC3523EUD-2#TRPBF equivalent, key selection criteria include its dual-converter integration, 2.4MHz switching frequency (LTC3523-2 variant), independent shutdown and power-good signals, thermal/overcurrent protection, and sub-3μA shutdown current - all critical for space-constrained, multi-rail portable designs.
Technical Context
The LTC3523EUD-2#TRPBF implements two independent current-mode controlled converters sharing a single 2.4MHz oscillator. The step-up channel uses internal P-channel and N-channel MOSFETs with 0% duty cycle support; the step-down uses synchronous rectification with 100% duty cycle capability. Both feature internal compensation, soft-start (500μs), and separate feedback references (1.20V for boost, 0.600V for buck).
Its MODE pin selects between fixed-frequency PWM (MODE grounded) and automatic Burst Mode (MODE high), reducing quiescent current to 45μA in sleep. Independent SHDN1/SHDN2 pins enable per-converter shutdown, while PGOOD1/PGOOD2 open-drain outputs provide ±9% output regulation monitoring with hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2.4MHz nominal - enables use of small 4.7μH inductors and <10μF ceramic output capacitors, minimizing solution footprint. |
| Step-Up Output Range | 1.8V to 5.25V - programmable via external resistor divider on FB1, supporting common logic rails and USB OTG. |
| Step-Down Output Range | 0.615V to 5.5V - adjustable via FB2 divider, suitable for core voltage regulation of low-voltage MCUs and sensors. |
| Peak Switch Current Limit | 600mA (boost), 400mA (buck) - hard-limited to prevent MOSFET overstress during transients or short circuits. |
| Quiescent Current (Burst Mode) | 45μA - measured from input supply at VIN = 2.4V, enabling >100-hour battery life in always-on sensor nodes. |
| Shutdown Current | <3μA - ensures negligible drain on primary battery during system sleep, critical for long-term portable operation. |
| Thermal Protection | Overtemperature shutdown at TJ ≈ 160°C - disables both converters and discharges soft-start capacitor until die cools ~15°C. |
Pinout & Package
Package: 16-lead 3mm × 3mm × 0.75mm plastic QFN (UD package) with exposed thermal pad (Pin 17) requiring solder connection to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1 (Pin 1) | Step-up feedback input | Connects to resistor divider tap; regulates VOUT1 to 1.20V reference - sets output voltage as VOUT1 = 1.2V × (1 + R1/R2). |
| VIN1 (Pin 2) | Step-up input power | Accepts 1.8V–5.5V supply; may be independent from VIN2 - supports split-input architectures (e.g., battery + auxiliary rail). |
| PGOOD1 (Pin 3) | Step-up power-good indicator | Open-drain output pulled low when VFB1 falls >9% below regulation - used for sequencing or fault signaling. |
| VOUT (Pin 4) | Step-up output sense & rectifier drain | Senses regulated output and provides bias for internal synchronous rectifier - requires short, low-inductance trace to output cap. |
| SW1 (Pin 5) | Step-up switch node | Connects to inductor; internal 150Ω anti-ringing resistor engages during discontinuous mode to suppress EMI. |
| GND1 (Pin 6) | Step-up power ground | Dedicated ground return for boost circuit - must connect directly to (–) terminal of step-up output capacitor. |
| GND2 (Pin 7) | Step-down power ground | Dedicated ground return for buck circuit - isolated from GND1 internally; connects to (–) terminal of step-down output cap. |
| SW2 (Pin 8) | Step-down switch node | Connects to buck inductor; synchronous rectification eliminates external diode - improves light-load efficiency. |
| VIN2 (Pin 9) | Step-down input power | Accepts 1.8V–5.5V; may differ from VIN1 - enables cascaded configurations (e.g., boost output feeding buck input). |
| MODE (Pin 10) | Operating mode select | High = automatic Burst/PWM transition; Low = fixed 2.4MHz PWM - no floating allowed; requires pull-up/down resistor. |
| PGOOD2 (Pin 11) | Step-down power-good indicator | Open-drain output with –9% threshold and 6.6% hysteresis - provides noise-immune status for downstream logic. |
| FB2 (Pin 12) | Step-down feedback input | Regulates VOUT2 to 0.600V reference - sets output as VOUT2 = 0.6V × (1 + R3/R4); requires lead capacitor if R > 500kΩ. |
| SHDN2 (Pin 13) | Step-down shutdown control | Logic-high enables buck converter; low disables it with <1μA quiescent draw - voltage must not exceed VIN2. |
| GND3 (Pin 14) | Analog ground reference | Return point for both FB1/FB2 dividers - isolates analog sensing from noisy power grounds to minimize regulation error. |
| VBAT (Pin 15) | Analog supply reference | Must connect to higher of VIN1 or VIN2 - stabilizes internal references and improves line regulation across inputs. |
| SHDN1 (Pin 16) | Step-up shutdown control | Logic-high enables boost; low disables with <1μA quiescent draw - voltage must not exceed VIN1. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent converters | Single-chip integration of 600mA boost + 400mA buck eliminates discrete solutions, reduces BOM count by ≥12 components and PCB area by >40%. |
| True output disconnect (boost) | Internal P-channel rectifier body diode is actively blocked during shutdown - VOUT drops to 0V with zero hold-up current, enabling clean system power-off. |
| Zero-current detection | Monitors inductor current and disables synchronous rectifier at ~20mA - prevents reverse current flow and maintains >85% efficiency at 1mA load. |
| Shared 2.4MHz oscillator | Eliminates beat frequencies and EMI peaks from asynchronous switching - simplifies filtering and meets Class B EMC requirements without shielding. |
| Independent power-good outputs | PGOOD1 and PGOOD2 drive separate pull-up resistors - enables precise power sequencing (e.g., PGOOD1 → SHDN2) and fault isolation in multi-rail systems. |
Applications
| Portable Medical Sensors | GPS Navigation Devices |
|---|---|
Use Scenario: Wearable blood oxygen monitor powered by single alkaline cell (1.8–3.2V), requiring 3.3V MCU rail and 1.2V analog sensor rail. IC Role / Device Role / Timing Role: LTC3523EUD-2#TRPBF generates both rails simultaneously from same input; step-up supplies MCU, step-down powers precision ADC. Use Value: Dual conversion avoids external LDOs, cuts total solution size to <25mm², and extends battery life to 120+ hours via Burst Mode at 50μA average load. |
Use Scenario: Handheld GPS unit using Li-ion battery (2.5–4.2V) needing 5V USB host port and 2.5V RF front-end supply. IC Role / Device Role / Timing Role: LTC3523EUD-2#TRPBF boosts battery to 5V for USB, then bucks to 2.5V for GNSS receiver - both regulated independently. Use Value: Eliminates need for separate boost IC and buck IC; achieves >90% efficiency at 150mA/200mA loads, reducing thermal load in sealed enclosure. |
| Industrial Handheld Scanners | Digital Cameras (Entry-Level) |
Use Scenario: Rugged barcode scanner with 3.3V processor, 1.8V image sensor, and 5V laser driver - powered by 2-cell NiMH (2.4V nominal). IC Role / Device Role / Timing Role: LTC3523EUD-2#TRPBF provides three regulated rails: step-up to 5V (laser), step-down to 1.8V (sensor), and VOUT (3.3V) for CPU. Use Value: Single-package solution replaces three discrete regulators; 2.4MHz switching allows use of 2.0×2.5mm inductors, fitting tight mechanical constraints. |
Use Scenario: Compact digital camera using single Li-ion cell (3.0–4.2V) requiring 3.3V image processor and 1.2V CMOS sensor core voltage. IC Role / Device Role / Timing Role: LTC3523EUD-2#TRPBF delivers both rails with independent soft-start - prevents brown-out during flash-triggered load surges. Use Value: Integrated current limiting (600mA boost / 400mA buck) protects against short-circuit damage during lens motor stall or sensor ESD events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65136RGER | Boost+buck configuration with 1.2MHz switching, but only 400mA boost / 300mA buck; no Burst Mode; requires external compensation. | Lower output current capability and no light-load optimization - less suitable for battery runtime-critical devices. | Choose TPS65136RGER only if cost sensitivity outweighs efficiency needs and design can accommodate larger passive components. |
| MAX8646ETE+ | Integrated 600mA boost + 600mA buck at 2.25MHz; includes I²C interface for dynamic voltage scaling, but lacks independent PGOOD outputs and true output disconnect. | I²C programmability adds flexibility for adaptive systems, but removes pin-strapped simplicity and increases firmware dependency. | Select MAX8646ETE+ when voltage scaling or telemetry is required; avoid if deterministic, low-footprint, or fail-safe sequencing is mandatory. |
Compared with TPS65136RGER and MAX8646ETE+, the LTC3523EUD-2#TRPBF offers superior light-load efficiency via Burst Mode, guaranteed output disconnect for safe shutdown, and fully independent power-good signaling - making it optimal for ultra-low-power, safety-aware portable instrumentation where reliability and minimal component count are prioritized over programmability.
Availability
LTC3523EUD-2#TRPBF is available at Aetrix Electronics and suitable for GPS navigators, portable medical instruments, industrial handheld scanners, and entry-level digital cameras requiring stable component supply, long-term manufacturability, and consistent parametric performance across temperature.
Supply support for LTC3523EUD-2#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3523EUD-2#TRPBF belongs to Linear's µPower DC/DC converter family, engineered specifically for space-constrained, battery-operated portable electronics demanding high efficiency across wide load ranges and robust protection features.
FAQ
What is the key functional difference between LTC3523EUD-2#TRPBF and LTC3523EUD#TRPBF?
The LTC3523EUD-2#TRPBF operates at a nominal 2.4MHz switching frequency, while the LTC3523EUD#TRPBF runs at 1.2MHz. This higher frequency allows smaller external inductors (e.g., 4.7μH vs 10μH) and ceramic capacitors, reducing total solution size by ~30%. Both share identical pinout, protection features, and dual-converter architecture.
Does LTC3523EUD-2#TRPBF support true output disconnect on both converters?
LTC3523EUD-2#TRPBF provides true output disconnect only on the step-up converter via active blocking of the internal P-channel rectifier body diode during shutdown - ensuring VOUT drops to 0V with zero hold-up current. The step-down converter does not offer this feature; its output follows input when disabled.
Can LTC3523EUD-2#TRPBF operate with different input voltages on VIN1 and VIN2?
Yes. LTC3523EUD-2#TRPBF supports independent input supplies: VIN1 (step-up) and VIN2 (step-down) may be connected to separate sources (e.g., battery and USB VBUS), provided both remain within 1.8V–5.5V and VBAT is tied to the higher of the two. This enables flexible power architecture design.
What is the purpose of the VBAT pin on LTC3523EUD-2#TRPBF?
The VBAT pin on LTC3523EUD-2#TRPBF serves as the analog reference for internal voltage references and error amplifiers. It must be connected to the higher of VIN1 or VIN2 to ensure stable regulation and optimal line regulation performance across varying input conditions.
How does the zero-current comparator improve efficiency in LTC3523EUD-2#TRPBF?
The zero-current comparator in LTC3523EUD-2#TRPBF monitors inductor current and disables the synchronous rectifier when current falls to ~20mA. This prevents reverse current flow through the MOSFET body diode, maintaining >85% efficiency at light loads (e.g., 1mA) and eliminating the need for external Schottky diodes.
LTC3523EUD-2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN 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:
- 2
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.615V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 400mA, 600mA (Switch)
- Frequency - Switching:
- 2.4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
LTC3523EUD-2#TRPBF FAQ
1.How can I place an order for LTC3523EUD-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3523EUD-2#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 LTC3523EUD-2#TRPBF reliable?
The price and inventory of LTC3523EUD-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3523EUD-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3523EUD-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3523EUD-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3523EUD-2#TRPBF?
LTC3523EUD-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3523EUD-2#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 LTC3523EUD-2#TRPBF?
For technical support, including LTC3523EUD-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3523EUD-2#TRPBF requirements.
6.How does Aetrix verify that LTC3523EUD-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3523EUD-2#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 LTC3523EUD-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3523EUD-2#TRPBF?
All LTC3523EUD-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3523EUD-2#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 LTC3523EUD-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3523EUD-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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