My Inquiry
My Account
Analog Devices Inc. LTC3528EDDB#TRPBF
- Part No.:
- LTC3528EDDB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3528EDDB#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 1A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,144
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3528EDDB#TRPBF from Analog Devices (formerly Linear Technology) is a 1MHz synchronous step-up DC/DC converter with output disconnect, designed for ultra-low-voltage battery-powered systems. It starts up from 0.70V, delivers up to 400mA at 3.3V from two alkaline/NiMH cells, achieves 94% peak efficiency, and integrates soft-start, current-mode PWM control, and Burst Mode® operation for 12µA quiescent current.
For engineers reviewing the LTC3528EDDB#TRPBF datasheet, LTC3528EDDB#TRPBF pinout, LTC3528EDDB#TRPBF application, or LTC3528EDDB#TRPBF equivalent, key selection criteria include minimum start-up voltage (0.70V), fixed 1MHz switching frequency, output disconnect capability, Burst Mode® vs continuous PWM distinction (LTC3528 vs LTC3528B), and DFN-8 (3mm × 2mm) thermal performance with exposed pad grounding.
Technical Context
The LTC3528EDDB#TRPBF employs current-mode PWM control with internal slope compensation and adaptive zero-current detection to maintain stability across wide input/output ranges. Its independent start-up oscillator enables operation below 0.88V, and internal soft-start ramps peak inductor current to 1.5A over ~0.5ms to prevent inrush.
Output disconnect is achieved by disabling the P-channel synchronous rectifier when VOUT ≤ (VIN + 0.24V), eliminating body diode conduction. Anti-ringing circuitry actively damps SW-node resonance during discontinuous conduction mode to reduce EMI without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Start-Up Voltage | 0.70V typical - enables single-cell alkaline/NiMH operation before system power rail is established |
| Switching Frequency | 1.0MHz fixed - allows use of compact 2.2–4.7µH shielded inductors and low-ESR ceramic capacitors |
| Output Voltage Range | 1.6V to 5.25V adjustable via FB resistor divider - supports Li-ion, dual-cell, and logic rail generation |
| Peak Efficiency | 94% at VOUT=3.3V, VIN=2.4V, IOUT=400mA - minimizes thermal load in space-constrained portable devices |
| Quiescent Current (Burst) | 12µA typical - extends battery life in standby or sensor-monitoring modes |
| Shutdown Current | <1µA - ensures near-zero drain during system sleep or storage |
| Current Limit | 1.5A typical - sustains high transient loads without foldback, critical for flash memory or audio amplifier bursts |
Pinout & Package
Package: 8-lead 3mm × 2mm × 0.75mm plastic DFN with exposed GND pad (Pin 9), requiring soldering to PCB ground plane for thermal and electrical performance (θJA = 76°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (1) | Logic-controlled shutdown input | Pulled low (<0.25V) disables switching and reduces IQ to <1µA; internal 4MΩ pull-down ensures default-off state |
| FB (2) | Feedback voltage sense node | Compares divided VOUT against 1.20V reference; sets output via R1/R2 divider; input bias current <50nA minimizes divider error |
| PGOOD (3) | Open-drain power-good flag | Asserts low when VFB drops >10% below regulation threshold - enables sequencing or system reset coordination |
| VOUT (4) | Regulated output & synchronous rectifier drain | Direct connection point for output capacitor; internal P-MOSFET body diode is blocked to enable true output disconnect |
| SW (5) | Switch node | Connects to inductor; anti-ringing switch clamps to VIN during DCM to suppress EMI; requires short, low-inductance PCB trace |
| PGND (6) | Power ground return | Low-impedance path for high-frequency switch current; must tie directly to input/output capacitor negatives |
| SGND (7) | Signal ground reference | Reference for FB, PGOOD, and error amplifier; separate from PGND to avoid noise coupling into feedback loop |
| VIN (8) | Battery input supply | Accepts 0.7V–5V; minimum 1µF ceramic decoupling required; powers IC until VOUT exceeds VIN by 0.24V |
| GND (9, Exposed Pad) | Thermal & electrical ground | Mandatory solder connection to PCB ground plane; primary heat dissipation path and additional ground reference |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-Low Start-Up Voltage | 0.70V enables direct startup from partially discharged single-cell batteries, extending usable battery capacity |
| Integrated Output Disconnect | Eliminates reverse current flow through internal P-MOSFET body diode, allowing VOUT to fully discharge during shutdown |
| Burst Mode® Operation | Reduces quiescent current to 12µA at light loads while maintaining regulated output, optimizing battery runtime in intermittent-use devices |
| Anti-Ringing Control | Internally damps SW-node LC resonance during discontinuous conduction, lowering radiated EMI without external snubbers |
| Internal Soft-Start | Ramps peak inductor current linearly to 1.5A over ~0.5ms, preventing output overshoot and input surge during turn-on |
Applications
| Medical Instrument Power | Noise-Canceling Headphones |
|---|---|
Use Scenario: Portable glucose meters and pulse oximeters powered by single AA/AAA alkaline cells with deep discharge profiles. IC Role / Device Role / Timing Role: Step-up regulator generating stable 3.3V for microcontroller, sensor interface, and LCD backlight from 0.9–1.5V input. Use Value: 0.70V start-up and 94% efficiency at 200mA extend battery life beyond 300 measurements per set; output disconnect prevents battery drain during off-state. | Use Scenario: Battery-powered active noise cancellation (ANC) headphones requiring clean, low-noise 1.8V/3.3V rails for analog front-end and DSP. IC Role / Device Role / Timing Role: Primary boost converter delivering 3.3V at 400mA from two NiMH cells, with Burst Mode® enabling sub-20µA standby draw. Use Value: Fixed 1MHz operation avoids audible switching noise; anti-ringing control suppresses EMI that could interfere with sensitive microphone preamps. |
| Wireless Mouse Power | Bluetooth Headset Power |
Use Scenario: Ultra-low-power optical wireless mice using single alkaline cell with aggressive duty-cycling (active <1% of time). IC Role / Device Role / Timing Role: Generates 3.3V for MCU and RF transceiver; enters Burst Mode® during sleep intervals between motion events. Use Value: 12µA quiescent current and <1µA shutdown current maximize shelf life; integrated soft-start prevents brownout during wake-up bursts. | Use Scenario: Compact Bluetooth headsets operating from single Li-ion cell (2.7–4.2V) needing regulated 1.8V for codec and 3.3V for radio. IC Role / Device Role / Timing Role: Boost converter configured for VIN > VOUT operation to regulate 3.3V even as battery discharges below 3.3V. Use Value: Output disconnect prevents reverse current into aging battery; 1.5A current limit supports RF transmit peaks without dropout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61200DRCT | 0.3V start-up, 0.95MHz switching, no output disconnect, 1.2A current limit | Lacks true output disconnect; higher start-up voltage margin required for deeply discharged cells | Select when lowest possible start-up voltage is critical and output disconnect is not required |
| LTC3528BEDDB#TRPBF | Same package and pinout; continuous 1MHz PWM (no Burst Mode®), lower light-load ripple | Preferred for noise-sensitive audio/RF applications where consistent switching frequency is mandatory | Choose for fixed-frequency EMI control and reduced output ripple at light loads |
Compared with TPS61200DRCT, LTC3528EDDB#TRPBF provides superior ultra-low-voltage start-up and output disconnect but trades off slightly higher light-load ripple in Burst Mode®; versus LTC3528BEDDB#TRPBF, it offers significantly lower quiescent current at the cost of variable-frequency operation under light loads.
Availability
LTC3528EDDB#TRPBF is available at Aetrix Electronics and suitable for medical instrumentation, noise-canceling headphones, wireless mice, Bluetooth headsets, and flash-based MP3 players requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3528EDDB#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC3528 product line was developed specifically for space-constrained, battery-powered portable electronics demanding ultra-low-voltage start-up, high efficiency across wide load ranges, and robust protection features in minimal footprint.
FAQ
What is the minimum input voltage required for LTC3528EDDB#TRPBF to start switching?
The LTC3528EDDB#TRPBF has a typical minimum start-up voltage of 0.70V, verified across temperature and process corners. It will begin switching and charge the output once VIN reaches this threshold, even with no pre-bias on VOUT. This enables reliable operation from single alkaline or NiMH cells down to end-of-life voltage.
Does LTC3528EDDB#TRPBF support output voltages above the input voltage?
Yes, LTC3528EDDB#TRPBF is a step-up (boost) converter and inherently supports VOUT > VIN. It also supports VIN > VOUT operation (buck-like mode) with regulation maintained, though efficiency drops significantly and maximum output current is reduced compared to boost mode.
How does the output disconnect feature work in LTC3528EDDB#TRPBF?
LTC3528EDDB#TRPBF achieves true output disconnect by disabling the internal P-channel MOSFET synchronous rectifier when VOUT ≤ (VIN + 0.24V). This blocks reverse current flow through the body diode, allowing VOUT to fall to 0V during shutdown and preventing battery drain - a critical feature for long-storage consumer devices.
What is the purpose of the exposed pad (Pin 9) on the LTC3528EDDB#TRPBF DFN package?
The exposed pad (Pin 9) on LTC3528EDDB#TRPBF is electrically and thermally connected to GND. It must be soldered to a PCB ground plane to achieve the specified θJA of 76°C/W. Failure to do so results in significantly higher junction temperatures, potential thermal shutdown, and reduced reliability under sustained load.
Can LTC3528EDDB#TRPBF operate with an input voltage higher than its absolute maximum rating?
No. The absolute maximum VIN rating for LTC3528EDDB#TRPBF is 6V DC. Exceeding this - even briefly - risks permanent damage. Input voltage must remain within –0.3V to 6V under all conditions, including transients. For systems with higher source voltages, external protection (e.g., TVS, LDO pre-regulator) is required before the LTC3528EDDB#TRPBF input.
LTC3528EDDB#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.88V
- Voltage - Input (Max):
- 5.25V
- Voltage - Output (Min/Fixed):
- 1.6V
- Voltage - Output (Max):
- 5.25V
- Current - Output:
- 1A (Switch)
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC3528EDDB#TRPBF FAQ
1.How can I place an order for LTC3528EDDB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3528EDDB#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 LTC3528EDDB#TRPBF reliable?
The price and inventory of LTC3528EDDB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3528EDDB#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3528EDDB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3528EDDB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3528EDDB#TRPBF?
LTC3528EDDB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3528EDDB#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 LTC3528EDDB#TRPBF?
For technical support, including LTC3528EDDB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3528EDDB#TRPBF requirements.
6.How does Aetrix verify that LTC3528EDDB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3528EDDB#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 LTC3528EDDB#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3528EDDB#TRPBF?
All LTC3528EDDB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3528EDDB#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 LTC3528EDDB#TRPBF part is unused and in its original packaging.
Return procedure for LTC3528EDDB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3528EDDB#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
