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Analog Devices Inc. LTC7825AV#PBF
- Part No.:
- LTC7825AV#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-PowerTFQFN
- Datasheet:
-
LTC7825AV#PBF.pdf
- Description:
- IC REG CHARG PUMP ADJ 12A 28LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:881
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Product details
Overview
LTC7825AV#PBF from Analog Devices is a monolithic switched-capacitor DC/DC converter optimized for 2:1 voltage division (e.g., 24V→12V) at up to 12A output current, featuring integrated MOSFETs with RDS(ON) of 8 mΩ (top), 6 mΩ (bottom), and 2.5 mΩ (VOUT), programmable 100 kHz–1.4 MHz switching frequency, and input overvoltage protection up to 40V transient survival. It enables high-efficiency intermediate bus conversion in space-constrained industrial power systems.
For engineers reviewing the LTC7825AV#PBF datasheet, LTC7825AV#PBF pinout, LTC7825AV#PBF application, or LTC7825AV#PBF equivalent, key selection criteria include its open-loop 2:1 voltage ratio operation, VHIGH/VLOW window fault monitoring via HYS_PRGM, integrated bootstrap diodes, EXTVCC-supported thermal management, and LGA-28 (4mm × 5mm) package compatibility with high-density PCB layouts.
Technical Context
The LTC7825AV#PBF implements a constant-frequency, open-loop switched-capacitor architecture-no feedback loop regulates VLOW; instead, it relies on precise internal switch timing to maintain VLOW ≈ VHIGH/2 under steady-state load. Its four internal N-channel MOSFETs are driven by floating bootstrapped supplies (BOOSTH/SWL, BOOSTL/SWH) and powered via dual LDOs (INTVCC from VCC or EXTVCC).
Fault handling is hardware-based: VLOW deviation beyond a user-programmable hysteresis window (100–480 mV) triggers FAULT assertion and shutdown; VHIGH > 26V pulls OVG low to disable an external protection MOSFET; short-circuit events disconnect VOUT from VLOW using an integrated MOSFET. Startup includes pre-balance current sourcing/sinking (200 mA/50 mA) controlled by TIMER pin voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Fixed-ratio switched-capacitor (2:1 divider); no closed-loop regulation - output voltage accuracy depends on capacitor matching and ripple control. |
| Input Voltage Range (VHIGH) | 0 V to 25 V - supports wide intermediate bus rails including 12 V, 16 V, 20 V, and 24 V inputs. |
| Output Current Capability | Up to 12 A continuous - limited by thermal design; higher currents possible with heatsinking or forced airflow. |
| Switching Frequency | 100 kHz to 1.4 MHz - set by resistor on FREQ pin (10 µA sink); trade-off between efficiency (lower fSW) and component size (higher fSW). |
| Efficiency | 97% at 10 A load (VHIGH = 20 V, VLOW = 10 V) - achieved via low-RDS(ON) integrated MOSFETs and minimized gate drive losses. |
| Protection Features | VLOW window fault detection, VHIGH overvoltage cutoff (26 V threshold), input/output short-circuit isolation, thermal shutdown (>165°C), and undervoltage lockout (3.9 V on INTVCC). |
| Package | 28-pin LGA (LQFN), 4 mm × 5 mm - exposes thermal pad for PCB heat sinking; requires SGND/PGND separation per layout guidelines. |
Pinout & Package
Package: 28-lead plastic LQFN (4 mm × 5 mm), exposed thermal pad, –40°C to +125°C operating junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VHIGH (1, 28) | High-side input rail | Primary input for switched-capacitor operation; connects to flying and input capacitors; withstands transients up to 40 V with external MOSFET. |
| SWH (2, 3) | High-side switching node | Connects to flying capacitor (CFLY) top terminal; drives top two MOSFETs; referenced to BOOSTH for gate drive. |
| VLOW (4, 5) | Low-side output rail | 2:1 divided output (≈VHIGH/2); monitored by window comparator; source/sink capability up to 200 mA/50 mA during pre-balance. |
| SWL (6, 7) | Low-side switching node | Connects to flying capacitor (CFLY) bottom terminal; drives bottom two MOSFETs; referenced to BOOSTL for gate drive. |
| PGND (8–11) | Power ground return | High-current return path for all MOSFETs and flying capacitors; must be low-inductance, separate from SGND. |
| VOUT (12–14) | Isolated output terminal | Internally disconnected from VLOW during faults; use external short if isolation not required for improved efficiency. |
| BOOSTH / BOOSTL (15, 22) | Floating gate drive supplies | Provide bootstrapped bias for high-side MOSFET drivers; require 0.1 µF X7R ceramic caps to SWH/SWL respectively. |
| HYS_PRGM (18) | Window hysteresis programming | Sets VLOW fault window (100–480 mV) via resistor to GND; 10 µA current flows out - determines overcurrent trip point. |
| FREQ (20) | Switching frequency control | 10 µA current sink; resistor to SGND sets voltage (e.g., 100 kΩ → 1 V → 600 kHz); ties to SGND/INTVCC for 300/600 kHz defaults. |
| FAULT (21) | Open-drain fault indicator | Pulled low on VLOW window violation, VHIGH OV, or thermal fault; can drive external disconnect MOSFETs up to 25 V. |
| SGND (23) | Signal ground reference | Reference for RUN, FREQ, HYS_PRGM, TIMER, FL5V; must be connected to PGND at single point on PCB. |
| EXTVCC (24) | External INTVCC supply input | Enables second 4.5 V LDO when >5 V and VCC >6 V; reduces die temperature in high-VIN applications; max 13 V. |
| INTVCC (25) | Internal LDO output | 4.5 V ±250 mV regulated supply for logic and drivers; requires ≥4.7 µF ceramic bypass to PGND. |
| VCC (26) | Main bias supply | 4.5 V to 40 V input for primary LDO; powers charge pump and UVLO; bypass with ceramic cap to PGND. |
| OVG (27) | External MOSFET gate control | Drives gate of N-channel input protection MOSFET; floats to ~VHIGH+4 V normally; pulled to VHIGH if VHIGH >26 V. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated MOSFETs with matched RDS(ON) | Top pair: 8 mΩ, bottom pair: 6 mΩ, VOUT MOSFET: 2.5 mΩ - minimizes conduction loss and enables compact 2:1 conversion without external switches. |
| Programmable VLOW fault window | HYS_PRGM pin accepts 10 µA current; resistor sets hysteresis from 100 mV to 480 mV - allows precise overcurrent threshold tuning across load/temperature. |
| Thermal-aware EXTVCC support | Second 4.5 V LDO activated when EXTVCC >5 V and VCC >6 V - shifts driver power away from high-VIN LDO, reducing junction temperature rise in 24 V+ systems. |
| Hardware-enforced input/output isolation | VOUT disconnect MOSFET turns off during VHIGH short-circuit - prevents VLOW collapse and maintains downstream system uptime. |
| Controlled soft-start with pre-balance | TIMER pin voltage (0.5–1.0 V range) enables active VLOW sourcing/sinking (200 mA/50 mA) - eliminates inrush spikes even with large CFLY/CLOW banks. |
Applications
| Telecom Intermediate Bus | Industrial PLC Power Rails |
|---|---|
|
Use Scenario: Converting 24 V backplane supply to isolated 12 V for FPGA I/O banks and SERDES power in 1U telecom servers. IC Role / Device Role / Timing Role: Fixed-ratio voltage divider providing stable 12 V output without feedback loop latency; FAULT signal interfaces with system supervisor MCU. Use Value: 97% efficiency at 10 A reduces board-level heat density; LGA-28 footprint fits tight 1U airflow constraints; EXTVCC support lowers thermal stress under sustained full load. |
Use Scenario: Generating 12 V from 24 V fieldbus supply for analog sensor front-ends and isolated CAN transceivers in modular PLC I/O modules. IC Role / Device Role / Timing Role: Open-loop 2:1 converter delivering clean, low-impedance 12 V rail; VLOW window monitoring detects sensor short-circuits before damage occurs. Use Value: Integrated disconnect MOSFET prevents 24 V fault propagation to 12 V domain; programmable HYS_PRGM adapts overcurrent threshold to varying sensor count per module. |
| Battery-Energy Storage Systems | Automotive ADAS Domain Controllers |
|
Use Scenario: Stepping down 20–28 V Li-ion stack voltage to 10–14 V for BMS microcontrollers and cell monitoring ICs in stationary ESS cabinets. IC Role / Device Role / Timing Role: High-efficiency intermediate converter with transient tolerance up to 40 V - handles regenerative braking surges and load dump events. Use Value: OVG-controlled external MOSFET blocks >26 V transients; TIMER-based pre-balance ensures reliable startup after deep discharge; LGA thermal pad aids passive cooling. |
Use Scenario: Deriving 12 V from 24 V vehicle battery for radar SoCs and camera ISPs in centralized ADAS domain controllers. IC Role / Device Role / Timing Role: Compact 2:1 divider replacing discrete buck converters; FAULT output triggers ASIL-B-compliant fail-safe state in safety MCU. Use Value: 28-pin LGA enables automated assembly in high-reliability automotive PCBs; VHIGH/VLOW window monitoring meets ISO 16750-2 pulse test requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor voltage division applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC7823IUH#PBF | Lower current rating (6 A vs. 12 A); same 2:1 topology, LQFN-28 package, and pin-compatible pinout except missing VOUT pins. | Targeted at sub-6 A intermediate rails where thermal budget is tighter; lacks integrated VOUT disconnect MOSFET. | Select LTC7823IUH#PBF when output current ≤6 A and VOUT isolation is unnecessary - saves cost and simplifies layout. |
| MAX20432ATJ+T | 3:1 fixed-ratio capacitor charger (not 2:1); 16-pin TQFN; supports 3.5–36 V input; no HYS_PRGM or OVG pins. | Designed for 12 V → 4 V or 24 V → 8 V conversion; lacks programmable fault windows and input overvoltage control. | Choose MAX20432ATJ+T only for strict 3:1 step-down needs where LTC7825AV#PBF's 2:1 ratio is incompatible - no pin or functional replacement. |
Compared with LTC7823IUH#PBF, the LTC7825AV#PBF delivers double the output current and adds VOUT isolation; versus MAX20432ATJ+T, it provides precise 2:1 ratio, wider VHIGH range, and comprehensive hardware fault controls - making it the sole choice for high-current, thermally demanding 2:1 intermediate bus designs.
Availability
LTC7825AV#PBF is available at Aetrix Electronics and suitable for telecom intermediate bus conversion, industrial PLC power rails, battery-energy storage systems, and automotive ADAS domain controllers requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LTC7825AV#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and automotive markets.
The LTC7825AV#PBF belongs to Analog Devices' Power by Linear™ family of high-efficiency DC/DC converters, engineered specifically for fixed-ratio, high-current intermediate bus applications where minimal footprint, thermal resilience, and robust fault handling are critical.
FAQ
What is the maximum continuous output current supported by the LTC7825AV#PBF?
The LTC7825AV#PBF is rated for up to 12 A continuous output current under typical thermal conditions (2-layer PCB, 2 oz copper, no airflow). With enhanced thermal management - such as a 4-layer board, thermal vias to internal planes, heatsinking, or forced airflow - the LTC7825AV#PBF can sustain higher currents, as confirmed by its 200 mA pre-balance sourcing capability and low RDS(ON) MOSFETs. Always verify junction temperature using θJA = 29.7°C/W.
Does the LTC7825AV#PBF require an external feedback loop for voltage regulation?
No, the LTC7825AV#PBF operates as an open-loop switched-capacitor divider - it does not use a feedback loop to regulate VLOW. Instead, it relies on precise internal switch timing and capacitor networks to maintain VLOW ≈ VHIGH/2. Output voltage accuracy depends on component tolerances, flying capacitor ESR, and load-induced ripple; the HYS_PRGM pin sets a fault window but does not adjust regulation.
How does the EXTVCC pin improve thermal performance of the LTC7825AV#PBF?
The EXTVCC pin enables a secondary 4.5 V LDO that powers INTVCC when EXTVCC >5 V and VCC >6 V. This bypasses the primary VCC-to-INTVCC LDO, eliminating its power dissipation - especially beneficial in high-input-voltage applications (e.g., 24 V or 36 V) where the VCC LDO would otherwise generate significant heat. Using EXTVCC can reduce LTC7825AV#PBF junction temperature by up to 20°C.
Can the LTC7825AV#PBF be used in voltage doubler or inverter configurations?
Yes, the LTC7825AV#PBF supports voltage doubler (VLOW input → VHIGH output) and inverter (VHIGH input → negative output at PGND) modes per its Applications Information section. In these modes, startup must begin from near-zero input voltage to avoid inrush; slew-rate control via input MOSFET or Hot Swap controller is recommended. Note that 2:1 divider mode remains its primary validated application.
What is the role of the TIMER pin on the LTC7825AV#PBF during fault recovery?
During a fault condition, the TIMER pin is pulled low; upon fault clearance, a 4 µA (rising to 8 µA above 0.5 V) current charges the external CTIMER capacitor. When TIMER reaches ~3 V, the LTC7825AV#PBF restarts. Between 0.5 V and 1.0 V, the LTC7825AV#PBF actively sources/sinks up to 200 mA/50 mA to pre-balance VLOW to VHIGH/2 - ensuring controlled, low-inrush startup after fault recovery.
LTC7825AV#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-PowerTFQFN
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 0V
- Voltage - Output (Max):
- 25V
- Current - Output:
- 12A
- Frequency - Switching:
- 100kHz ~ 1.4MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-LQFN (4x5)
LTC7825AV#PBF FAQ
1.How can I place an order for LTC7825AV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7825AV#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 LTC7825AV#PBF reliable?
The price and inventory of LTC7825AV#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7825AV#PBF is usually 5 days.
3.What payment methods are accepted for LTC7825AV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7825AV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7825AV#PBF?
LTC7825AV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7825AV#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 LTC7825AV#PBF?
For technical support, including LTC7825AV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7825AV#PBF requirements.
6.How does Aetrix verify that LTC7825AV#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7825AV#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 LTC7825AV#PBF meets industry standards.
7.What is the process for return or replacement of LTC7825AV#PBF?
All LTC7825AV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7825AV#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 LTC7825AV#PBF part is unused and in its original packaging.
Return procedure for LTC7825AV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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