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Analog Devices Inc. LTC3499BEMS8#PBF
- Part No.:
- LTC3499BEMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC3499BEMS8#PBF.pdf
- Description:
- IC REG BOOST ADJ 750MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:400
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Product details
Overview
LTC3499BEMS8#PBF from Analog Devices (formerly Linear Technology) is a synchronous step-up DC/DC converter with integrated reverse-battery protection, designed for low-voltage battery-powered systems. It operates from 1.8V to 5.5V input, delivers adjustable 2V–6V output at up to 750mA peak switch current, and features true output disconnect, 1.2MHz fixed-frequency PWM, and <1µA shutdown current. It is used in handheld instruments and digital cameras requiring robust polarity protection and stable boost conversion.
For engineers reviewing the LTC3499BEMS8#PBF datasheet, LTC3499BEMS8#PBF pinout, LTC3499BEMS8#PBF application, or LTC3499BEMS8#PBF equivalent, key selection criteria include reverse-battery leakage (<5µA at –6V), continuous light-load switching (vs. Burst Mode in LTC3499), MSOP-8 thermal performance (θJA = 160°C/W), and FB voltage accuracy (1.195–1.245V).
Technical Context
The LTC3499BEMS8#PBF employs current-mode control with internal slope compensation and a 1.2MHz oscillator, enabling stable regulation with minimal external components. Its synchronous P/N-MOSFET architecture eliminates external Schottky diodes and supports VIN > VOUT pass-through operation with controlled current limiting.
Reverse-battery protection is implemented via integrated comparators and MOSFET gate control, limiting reverse current to ≤5µA at –6V on VIN/SW while maintaining zero forward conduction during shutdown. The device uses a transconductance error amplifier (Gm = 40µmhos) with VC-compensated loop and a 1.22V reference for precise output setting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports two alkaline/NiMH cells or single Li-ion without external LDO pre-regulation. |
| Output Voltage Range | 2V to 6V - set via resistor divider on FB pin; enables flexible rail generation for sensors, displays, or RF modules. |
| Switching Frequency | 1.2MHz (±20%) - allows use of compact 2.2–10µH inductors and ceramic capacitors, minimizing solution footprint. |
| Peak Switch Current | 750mA min - defines maximum deliverable load current under boost conditions with typical 0.4Ω NMOS RDS(on). |
| Shutdown Supply Current | <1µA - ensures negligible battery drain during system sleep, critical for multi-year battery life in portable devices. |
| FB Reference Voltage | 1.220V (±25mV) - determines output accuracy; combined with resistor tolerance, sets overall VOUT regulation error. |
| Reverse-Battery Leakage | ≤5µA at –6V on VIN/SW - prevents battery discharge and IC damage when batteries are inserted backward. |
Pinout & Package
Package: 8-Lead Plastic MSOP (3mm × 3mm × 1.1mm), exposed pad not present (unlike DFN variant); θJA = 160°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Enable/disable control input | Pulled high (>1.2V) to activate; pulled low (<0.2V) to enter ultra-low-IQ shutdown with true output disconnect. |
| VIN (Pin 2) | Main power input with reverse protection | Accepts 1.8–5.5V; internal circuitry blocks reverse current flow and isolates load during polarity reversal. |
| SW (Pin 3) | Switch node connection | Drives external inductor; integrates antiringing switch (250Ω) to damp LC ringing in discontinuous mode and reduce EMI. |
| GND (Pin 4) | Signal and power ground reference | Common return for all internal circuits; must be low-impedance connection to minimize noise and thermal rise. |
| SS (Pin 5) | Soft-start timing node | Charged by internal 3µA current source; external capacitor sets inrush current ramp time (t ≈ CSS × 200 ms). |
| VOUT (Pin 6) | Regulated power output | Delivers 2–6V to load; features true disconnect-no body-diode conduction-enabling zero VOUT in shutdown. |
| FB (Pin 7) | Feedback input to error amplifier | Senses output via resistor divider; 1.22V reference enables precise output programming with ±2% typical accuracy. |
| VC (Pin 8) | Error amplifier output | Connects to compensation network (RZ, CC1, CC2) to stabilize current-mode loop and suppress right-half-plane zero effects. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated reverse-battery protection | Eliminates need for external P-channel MOSFET or diode, reducing BOM count and PCB area while guaranteeing ≤5µA reverse leakage. |
| Continuous light-load operation | Unlike LTC3499's Burst Mode, LTC3499B maintains fixed 1.2MHz switching down to zero load-suppressing low-frequency output ripple in noise-sensitive analog/RF stages. |
| True output disconnect | Prevents VOUT backfeed and inrush surge by blocking internal PMOS body diode conduction, enabling safe hot-swap and zero-load shutdown. |
| 1.2MHz fixed-frequency PWM | Enables use of small, low-ESR ceramic capacitors and miniature inductors (e.g., 4.7µH), achieving <25mm² total solution size. |
| Overvoltage protection (OVP) | Triggers at 6.8V (with 400mV hysteresis) to safeguard downstream circuitry from regulator fault or feedback resistor failure. |
Applications
| Digital Camera Power Supply | Handheld Medical Instrument |
|---|---|
Use Scenario: Boosting two AA cells (1.8–3.2V) to stable 5V for CMOS image sensor and flash LED driver. IC Role / Device Role / Timing Role: Primary synchronous boost regulator with reverse-polarity immunity during battery replacement. Use Value: Eliminates risk of sensor damage from accidental reverse insertion; delivers 175mA at 94% efficiency across full input range. |
Use Scenario: Generating 3.3V from single Li-ion (3.1–4.2V) for microcontroller and precision ADC in portable blood glucose meter. IC Role / Device Role / Timing Role: Efficient step-up converter with zero-output shutdown for low-power sleep mode. Use Value: <1µA shutdown current extends battery life; continuous switching avoids audible noise in sensitive analog front-end. |
| MP3 Player Audio Amplifier Bias | Industrial Handheld Scanner |
Use Scenario: Providing 5V rail to Class-D audio amplifier from two NiMH cells (2.4V nominal) with dynamic load variation. IC Role / Device Role / Timing Role: High-efficiency boost stage with fast transient response enabled by current-mode control. Use Value: Maintains regulation during 50mA–200mA load steps; soft-start (via SS pin) prevents click/pop at power-on. |
Use Scenario: Powering 5V logic and laser diode driver in barcode scanner using replaceable alkaline battery pack. IC Role / Device Role / Timing Role: Reverse-battery protected DC/DC converter ensuring field-replaceable battery safety. Use Value: Withstands repeated incorrect battery insertion; OVP (6.8V) protects FPGA and laser driver from overvoltage faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3499EMS8#PBF | Same pinout and package, but uses Burst Mode at light loads (20µA IQ vs. LTC3499B's ~600µA), causing low-frequency ripple. | Better suited for ultra-low-power standby applications where ripple is acceptable; unsuitable for noise-critical analog rails. | Select LTC3499EMS8#PBF only if maximizing battery life in intermittent-use devices outweighs ripple sensitivity. |
| TPS610992DRCR | 400mA max output, 1.2MHz, no reverse-battery protection, smaller 2mm × 2mm WSON package. | Lacks integrated polarity protection-requires external MOSFET or diode; lower current capability limits use in higher-power peripherals. | Choose TPS610992DRCR only for space-constrained designs where reverse protection is handled externally and load <400mA. |
Compared with LTC3499EMS8#PBF, LTC3499BEMS8#PBF trades light-load efficiency for ripple-free output; compared with TPS610992DRCR, it offers superior protection integration and higher current, at the cost of larger MSOP-8 footprint and higher quiescent current.
Availability
LTC3499BEMS8#PBF is available at Aetrix Electronics and suitable for digital cameras, handheld medical instruments, MP3 players, industrial scanners, and battery-powered test equipment requiring stable component supply, reverse-polarity resilience, and compact boost conversion.
Supply support for LTC3499BEMS8#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3499B belongs to Linear's high-efficiency, low-voltage DC/DC converter product line, engineered specifically for battery-powered portable electronics demanding reverse-battery immunity, small solution size, and reliable light-load behavior.
FAQ
What is the key functional difference between LTC3499BEMS8#PBF and LTC3499EMS8#PBF?
The LTC3499BEMS8#PBF operates in continuous switching mode at all load levels, eliminating low-frequency output ripple common in Burst Mode converters. In contrast, LTC3499EMS8#PBF enters Burst Mode below a load-dependent threshold, reducing quiescent current to 20µA but introducing ~100Hz–1kHz ripple. This makes LTC3499BEMS8#PBF preferable for analog/RF circuits where spectral purity matters, while LTC3499EMS8#PBF suits ultra-low-power standby applications.
Does LTC3499BEMS8#PBF require an external Schottky diode?
No, LTC3499BEMS8#PBF does not require an external Schottky diode. It integrates synchronous N-channel and P-channel MOSFETs to replace the traditional diode rectifier, achieving higher efficiency (up to 94%) and eliminating forward voltage drop losses. The internal switches are optimized for low RDS(on) (0.4Ω NMOS, 0.45Ω PMOS at 5V VOUT), enabling full synchronous operation without external components.
How does reverse-battery protection work in LTC3499BEMS8#PBF?
LTC3499BEMS8#PBF implements active reverse-battery protection using internal comparators and gate-control circuitry that disables both internal MOSFETs when VIN falls below GND. This limits reverse current to ≤5µA at –6V on VIN/SW, preventing battery discharge, IC damage, and downstream circuit harm. Unlike passive solutions (e.g., series PMOS), this approach adds no forward voltage drop or power loss during normal operation.
What is the maximum output current capability of LTC3499BEMS8#PBF when VIN exceeds VOUT?
When VIN > VOUT (e.g., 4.5V input to 3.3V output), LTC3499BEMS8#PBF operates in pass-through mode with the PMOS switch fully enhanced. Maximum output current is thermally limited: IOUT(MAX) ≈ (125°C – TA) / (θJA × (VIN + 1.5 – VOUT)). For MSOP-8 (θJA = 160°C/W) at TA = 85°C, VIN = 4.5V, VOUT = 3.3V, this yields ~130mA - significantly lower than boost-mode capability due to higher conduction loss and thermal resistance.
Can LTC3499BEMS8#PBF be used with input voltages below 1.8V?
No, LTC3499BEMS8#PBF has a minimum start-up voltage of 1.6V (typical) but guarantees operation only from 1.8V to 5.5V per datasheet specifications. Below 1.8V, functionality-including regulation, shutdown, and reverse protection-is not assured. For sub-1.8V operation, consider dedicated ultra-low-voltage boost converters such as the LTC3526L, which starts at 0.5V.
LTC3499BEMS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2V
- Voltage - Output (Max):
- 6V
- Current - Output:
- 750mA (Switch)
- Frequency - Switching:
- 1.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LTC3499BEMS8#PBF FAQ
1.How can I place an order for LTC3499BEMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3499BEMS8#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 LTC3499BEMS8#PBF reliable?
The price and inventory of LTC3499BEMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3499BEMS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC3499BEMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3499BEMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3499BEMS8#PBF?
LTC3499BEMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3499BEMS8#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 LTC3499BEMS8#PBF?
For technical support, including LTC3499BEMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3499BEMS8#PBF requirements.
6.How does Aetrix verify that LTC3499BEMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3499BEMS8#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 LTC3499BEMS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC3499BEMS8#PBF?
All LTC3499BEMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3499BEMS8#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 LTC3499BEMS8#PBF part is unused and in its original packaging.
Return procedure for LTC3499BEMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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