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Analog Devices Inc. LTC3523EUD#TRPBF
- Part No.:
- LTC3523EUD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3523EUD#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ DL 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,606
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Product details
Overview
LTC3523EUD#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 3mm × 3mm QFN-16 package. It operates from 1.8V to 5.5V input, delivers adjustable outputs (1.8–5.25V up / 0.615–5.5V down), and achieves up to 94% efficiency at 1.2MHz switching frequency - ideal for space-constrained battery-powered systems requiring dual-rail power.
For engineers reviewing the LTC3523EUD#TRPBF datasheet, LTC3523EUD#TRPBF pinout, LTC3523EUD#TRPBF application, or LTC3523EUD#TRPBF equivalent, key selection criteria include independent shutdown control (SHDN1/SHDN2), dual power-good indicators (PGOOD1/PGOOD2), Burst Mode® operation for ultra-low quiescent current (45μA), and thermal/overcurrent protection across both converters.
Technical Context
The LTC3523EUD#TRPBF implements current-mode PWM control for both converters using a shared 1.2MHz oscillator (LTC3523 variant), with internal N- and P-channel MOSFETs achieving low RDS(ON) (0.22–0.36Ω for boost, 0.33–0.58Ω for buck). Soft-start (500μs) and internal compensation eliminate external loop components.
It supports true output disconnect in step-up mode (0% duty cycle) and 100% duty-cycle operation in step-down mode to maximize battery runtime. MODE pin selection enables automatic transition between Burst Mode® (light-load efficiency) and fixed-frequency PWM (low-noise operation).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion, 2-cell alkaline, or NiMH batteries without pre-regulation. |
| Step-Up Output Range | 1.8V to 5.25V - programmable via FB1 resistor divider; includes 1.20V ±2.5% feedback reference. |
| Step-Down Output Range | 0.615V to 5.5V - programmable via FB2 resistor divider; features 600mV ±2.5% feedback reference. |
| Switching Frequency | 1.2MHz (LTC3523) - enables use of compact 4.7μH inductors and reduces EMI compared to lower-frequency alternatives. |
| Quiescent Current | 45μA in Burst Mode® - extends battery life in standby or intermittent-operation devices like GPS navigators. |
| Shutdown Current | <3μA - ensures negligible drain during system sleep, critical for medical instruments with long shelf life. |
| Protection Features | Thermal shutdown (160°C), overcurrent limiting (600mA boost / 400mA buck peak), and independent PGOOD monitoring. |
Pinout & Package
Package: 16-lead 3mm × 3mm × 0.75mm plastic QFN (UD package) with exposed thermal pad (Pin 17 = GND), JEDEC MO-220 WEED-2 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1 (Pin 1) | Step-up feedback input | Connects to resistor divider tap; sets VOUT1 = 1.2V × (1 + R1/R2); 1.20V reference enables precise regulation. |
| VIN1 (Pin 2) | Step-up input supply | Accepts dedicated input source (e.g., battery); independent from VIN2 for flexible rail sequencing. |
| PGOOD1 (Pin 3) | Step-up power-good indicator | Open-drain output pulled low if VFB1 falls >9% below regulation; enables safe system power-up sequencing. |
| VOUT (Pin 4) | Step-up output sense & rectifier drain | Senses regulated output; supplies bias for internal synchronous rectifier; requires short PCB trace to output cap. |
| SW1 (Pin 5) | Step-up switch node | Connects to inductor; internal 150Ω anti-ringing resistor minimizes EMI during discontinuous conduction mode. |
| GND1 (Pin 6) | Step-up power ground | Dedicated ground return for boost circuit; must be connected directly to output capacitor negative terminal. |
| GND2 (Pin 7) | Step-down power ground | Dedicated ground return for buck circuit; isolated from GND1 internally to prevent ground bounce coupling. |
| SW2 (Pin 8) | Step-down switch node | Connects to buck inductor; optimized for low-loss switching with internal P/N-MOSFET pair. |
| VIN2 (Pin 9) | Step-down input supply | Accepts separate input (e.g., intermediate rail); supports cascaded buck-boost configurations. |
| MODE (Pin 10) | Operation mode select | High = automatic Burst Mode®/PWM transition; Low = fixed 1.2MHz PWM; prevents floating to ensure stable behavior. |
| PGOOD2 (Pin 11) | Step-down power-good indicator | Open-drain output with 6.6% hysteresis relative to FB2; provides noise-immune status for downstream logic. |
| FB2 (Pin 12) | Step-down feedback input | Sets VOUT2 = 0.6V × (1 + R3/R4); 600mV reference allows low-voltage core rail generation (e.g., 1.2V, 1.8V). |
| SHDN2 (Pin 13) | Step-down shutdown control | Logic-high enables buck converter; logic-low disables it with <1μA quiescent draw - enables dynamic rail gating. |
| GND3 (Pin 14) | Analog ground reference | Return point for both FB1/FB2 dividers; separates analog sensing from noisy power grounds to improve regulation accuracy. |
| VBAT (Pin 15) | Analog voltage reference input | Connected to higher of VIN1/VIN2; stabilizes internal references and improves line regulation across input range. |
| SHDN1 (Pin 16) | Step-up shutdown control | Independent enable/disable of boost converter; supports asymmetric power management (e.g., keep buck active while disabling boost). |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent converters | Single-chip integration of 600mA boost + 400mA buck eliminates discrete solutions, reducing BOM count and PCB area by >40%. |
| True output disconnect (boost) | 0% duty cycle capability eliminates body diode leakage during shutdown - ensures VOUT drops to 0V and draws zero input current. |
| Burst Mode® operation | Reduces quiescent current to 45μA at light loads while maintaining regulation, extending battery life in always-on sensors. |
| Independent PGOOD outputs | PGOOD1 and PGOOD2 provide per-rail status signals for sequenced power-up in multi-voltage systems (e.g., FPGA + memory rails). |
| Internal soft-start (500μs) | Prevents inrush current surges during startup; resets automatically after shutdown or thermal fault - no external timing capacitor needed. |
Applications
| Digital Cameras | Medical Instruments |
|---|---|
Use Scenario: Compact digital cameras require dual rails: 3.3V for image sensor and 5V for flash LED driver, powered from a single 3.7V Li-ion cell. IC Role / Device Role / Timing Role: LTC3523EUD#TRPBF generates both rails simultaneously - step-up to 5V for flash, step-down to 3.3V for sensor - with independent enable control. Use Value: Eliminates need for two separate converters; 94% peak efficiency minimizes heat near optical components; PGOOD signals coordinate flash firing timing. |
Use Scenario: Portable blood glucose meters operate from coin-cell batteries and require stable 1.8V microcontroller rail and 3.3V display interface rail. IC Role / Device Role / Timing Role: LTC3523EUD#TRPBF delivers regulated 1.8V (buck) and 3.3V (boost) from 2.0–3.0V input, with <3μA shutdown current preserving battery shelf life. Use Value: Dual-rail capability enables single-battery design; Burst Mode® extends operating time between battery replacements; thermal shutdown ensures safety during sterilization cycles. |
| Industrial Handhelds | GPS Navigators |
Use Scenario: Rugged handheld terminals use 2-cell alkaline batteries (1.8–3.2V) and require 3.3V for RF modem and 1.2V for ARM core. IC Role / Device Role / Timing Role: LTC3523EUD#TRPBF steps up to 3.3V for communication and steps down to 1.2V for processor, with independent SHDN pins enabling dynamic rail control. Use Value: 1.2MHz switching allows small 4.7μH inductors - critical for thin form factors; 16-pin QFN fits tight layouts; robust overtemperature protection meets industrial reliability standards. |
Use Scenario: Automotive GPS units draw power from vehicle battery (9–16V) via LDO pre-regulator, then require clean 3.3V for GPS receiver and 1.8V for baseband processor. IC Role / Device Role / Timing Role: LTC3523EUD#TRPBF accepts pre-regulated 3.6V input and delivers low-noise 3.3V (buck) and 1.8V (buck) rails with independent PGOOD monitoring. Use Value: Fixed 1.2MHz PWM mode (MODE = GND) suppresses switching noise in sensitive RF front-end; <10mVpp output ripple meets GPS receiver SNR requirements. |
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 |
|---|---|---|---|
| TPS65136RSAT | Integrated 300mA boost + 300mA buck; 2.7–5.5V input; fixed 3.3V/1.8V outputs; no adjustable FB; 2.5MHz switching. | Limited to fixed-output applications; lacks independent shutdown and PGOOD; smaller solution size but less flexible. | Select when fixed dual-rail outputs suffice and board space is more critical than configurability. |
| MAX17222ETA+T | Single 500mA boost only; 0.4–5.5V input; 2.0–5.25V output; 1.2MHz; no buck stage; integrated PGOOD. | Cannot replace dual-rail functionality - requires external buck converter for second rail; simpler for boost-only needs. | Select only if system requires boost only; not a functional substitute for LTC3523EUD#TRPBF's dual conversion capability. |
Compared with TPS65136RSAT and MAX17222ETA+T, the LTC3523EUD#TRPBF uniquely combines adjustable dual-rail generation, independent control, and high-efficiency Burst Mode® in a single QFN - making it optimal for battery-powered systems needing flexibility, low quiescent current, and precise voltage sequencing.
Availability
LTC3523EUD#TRPBF is available at Aetrix Electronics and suitable for digital cameras, medical instruments, and industrial handhelds requiring stable component supply with full production lifecycle support.
Supply support for LTC3523EUD#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) designs high-performance analog, mixed-signal, and power management ICs for precision, reliability, and efficiency-critical applications.
The LTC3523EUD#TRPBF belongs to Linear's high-efficiency DC/DC converter product line, engineered specifically for portable and battery-operated systems demanding dual regulated rails in minimal footprint.
FAQ
What is the switching frequency of the LTC3523EUD#TRPBF?
The LTC3523EUD#TRPBF operates at a nominal 1.2MHz switching frequency, as confirmed in its Electrical Characteristics table and Absolute Maximum Ratings section. This fixed frequency enables use of compact 4.7μH inductors and helps minimize EMI in space-constrained designs. The LTC3523-2 variant runs at 2.4MHz, but LTC3523EUD#TRPBF is the standard 1.2MHz version.
Does the LTC3523EUD#TRPBF support independent enable/disable of each converter?
Yes, the LTC3523EUD#TRPBF provides fully independent control via SHDN1 (Pin 16) for the step-up converter and SHDN2 (Pin 13) for the step-down converter. Pulling either pin low disables its respective converter with <1μA quiescent current, allowing dynamic rail management - for example, keeping the buck rail active while shutting down the boost rail during idle periods.
What is the purpose of the VBAT pin on the LTC3523EUD#TRPBF?
The VBAT pin (Pin 15) on the LTC3523EUD#TRPBF serves as an analog reference input connected to the higher of VIN1 or VIN2. It stabilizes internal voltage references and improves line regulation performance across the full input voltage range. Leaving VBAT unconnected or improperly biased degrades feedback accuracy and output voltage stability - it must be tied to a valid supply rail.
Can the LTC3523EUD#TRPBF generate a 1.2V output from a 2.4V input?
Yes, the LTC3523EUD#TRPBF can generate a stable 1.2V output from a 2.4V input using its step-down converter. With FB2 referenced to 600mV, a resistor divider (e.g., R3 = 100kΩ, R4 = 100kΩ) sets VOUT2 = 0.6V × (1 + 100k/100k) = 1.2V. The device supports step-down operation down to 0.615V and up to 5.5V output, with guaranteed performance across the –40°C to 85°C temperature range.
How does the LTC3523EUD#TRPBF handle thermal overload?
The LTC3523EUD#TRPBF incorporates thermal shutdown that activates at approximately 160°C junction temperature. When triggered, all internal switches disable, the soft-start capacitor discharges, and switching ceases until the die cools by ~15°C. This protects against sustained overloads. The exposed thermal pad (Pin 17) must be soldered to a PCB ground plane with multiple vias to maintain safe operating temperatures under full load.
LTC3523EUD#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:
- 1.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
LTC3523EUD#TRPBF FAQ
1.How can I place an order for LTC3523EUD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3523EUD#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#TRPBF reliable?
The price and inventory of LTC3523EUD#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3523EUD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3523EUD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3523EUD#TRPBF?
LTC3523EUD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3523EUD#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#TRPBF?
For technical support, including LTC3523EUD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3523EUD#TRPBF requirements.
6.How does Aetrix verify that LTC3523EUD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3523EUD#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3523EUD#TRPBF?
All LTC3523EUD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3523EUD#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3523EUD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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