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Analog Devices Inc. LTC3552EDHC#PBF
- Part No.:
- LTC3552EDHC#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3552EDHC#PBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:145
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Product details
Overview
LTC3552EDHC#PBF from Analog Devices (formerly Linear Technology) is a standalone linear Li-ion battery charger with integrated dual synchronous buck converters for portable single-cell battery systems. It delivers up to 950mA charge current, regulates float voltage at 4.2V ±1%, and provides two adjustable DC/DC outputs (0.6V–5V) operating at 2.25MHz. It is designed for USB-powered devices such as Bluetooth headsets and MP3 players.
For engineers reviewing the LTC3552EDHC#PBF datasheet, LTC3552EDHC#PBF pinout, LTC3552EDHC#PBF application, or LTC3552EDHC#PBF equivalent, key selection criteria include thermal regulation behavior, programmable charge termination threshold, dual-buck converter enable control logic, and DFN-16 package thermal pad grounding requirements.
Technical Context
The LTC3552EDHC#PBF integrates a P-channel linear charger with internal MOSFET and no external sense resistor, plus two independent current-mode synchronous buck regulators sharing a 2.25MHz oscillator. Charge termination uses an external ITERM resistor to set threshold between 17.5mA and 110mA, while each buck output is regulated via 0.6V feedback reference with ±0.012V accuracy over –40°C to 85°C.
Thermal regulation activates at ~120°C junction temperature to reduce charge current without shutdown; the MODE/SYNC pin selects Burst Mode (for peak efficiency at light load) or pulse-skipping mode (for lower output ripple). The device supports automatic recharge when battery voltage drops below 4.10V and enters <2µA sleep mode when input is removed.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Voltage | Fixed 4.2V ±1% float voltage - ensures safe full-charge state for standard Li-ion cells without external trimming. |
| Max Charge Current | 950mA (RPROG = 2kΩ) - programmable via single resistor; thermal regulation prevents overheating during high-current charging. |
| Buck Output Range | 0.6V to 5V per regulator - set by external resistive divider; 0.6V feedback reference enables precise low-voltage rail generation. |
| Switching Frequency | 2.25MHz (±0.45MHz) - allows use of compact 2.2µH and 4.7µH inductors and ceramic output capacitors. |
| Quiescent Current | 40µA per buck regulator in sleep mode - minimizes standby power loss in battery-backed systems. |
| Operating Temp | –40°C to +85°C ambient - specified performance across industrial temperature range; junction limit 125°C. |
| Package | 16-lead 5mm × 3mm × 0.75mm DFN with exposed thermal pad - requires PCB soldering for θJA = 40°C/W thermal performance. |
Pinout & Package
Package: 16-lead plastic DFN (DHC), 5mm × 3mm × 0.75mm, exposed pad (Pin 17) connected to GND. Requires soldering of exposed pad to PCB ground plane for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITERM (1) | Charge termination current programming | Connects to ground via RTERM (1kΩ–5kΩ) to set termination threshold (17.5–110mA); enables gas-gauging-compatible cutoff. |
| BAT (2) | Battery connection node | Direct connection to single-cell Li-ion anode; internal precision divider sets 4.2V float; drains <2µA in sleep mode. |
| CHRG (3) | Open-drain charge status indicator | Pulled low during active charge or recharge; high-impedance when terminated or disabled - drives LED directly. |
| MODE/SYNC (4) | Buck mode selection & external sync input | Tie to VCC for Burst Mode (high efficiency), GND for pulse-skipping (low noise); accepts external 2.25MHz clock. |
| SW2 (5) | Regulator 2 switch node | Connects to inductor; swings between VCC and GND; requires low-ESR ceramic capacitor and proper layout for EMI control. |
| POR (6) | Power-on reset open-drain output | Pulled low if either VFB drops >8.5%; releases after 262,144 cycles (~117ms) once both regulators are in regulation. |
| RUN2 (7) | Regulator 2 enable control | Logic-high enables Reg2; logic-low disables it - must be actively driven; no internal pull-up/pull-down. |
| VFB2 (8) | Regulator 2 feedback input | Monitors output via resistive divider; regulates to 0.6V reference; 30nA input bias enables high-resistor dividers. |
| VFB1 (9) | Regulator 1 feedback input | Identical function to VFB2; independent regulation loop allows asymmetric output configurations (e.g., 1.8V + 3.3V). |
| RUN1 (10) | Regulator 1 enable control | Same logic behavior as RUN2; enables/disables Reg1 independently - supports dynamic power rail sequencing. |
| VCC (11) | Buck regulators input supply | 2.5V–5.5V input; powers switching circuitry; requires local 1µF ceramic decoupling to GND near pin. |
| SW1 (12) | Regulator 1 switch node | Same electrical role as SW2; layout symmetry recommended to minimize coupling between regulators. |
| PROG (13) | Charge current programming & monitor | 1V servo point during CC mode; IBAT = 1000 × VPROG; clamped at ~2.4V - enables real-time current measurement. |
| VIN (14) | Charger input supply | 4.25V–8V USB/wall adapter input; UVLO at 3.8V with 200mV hysteresis; shuts down if VIN ≤ VBAT + 30mV. |
| PWR (15) | Input power present indicator | Open-drain output pulled low when VIN > UVLO and VIN > VBAT + 100mV - signals valid input for system power management. |
| EN (16) | Global charger enable | Logic-high forces shutdown (<2µA battery drain); floating or logic-low enables charge - internal 2MΩ pull-down. |
| Exposed Pad (17) | Thermal & electrical ground | Must be soldered to PCB ground plane; primary thermal path; not optional - failure causes θJA degradation & thermal shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| No external sense resistor or blocking diode | Reduces BOM count and PCB area; eliminates forward voltage drop and associated power loss in charging path. |
| Thermal regulation at ~120°C | Automatically scales back charge current to prevent die overheating - enables aggressive thermal design without manual derating. |
| Programmable C/5 charge termination | Enables accurate end-of-charge detection using ITERM resistor; supports battery aging compensation and fuel gauging integration. |
| 2.25MHz constant-frequency operation | Permits use of sub-3mm inductors and small ceramic capacitors - critical for ultra-thin portable device form factors. |
| Automatic recharge at 4.10V threshold | Maintains battery at ≥90% capacity without host intervention; eliminates user perception of "battery sag" during standby. |
| Low-quiescent 40µA buck sleep current | Extends battery runtime in always-on subsystems (e.g., Bluetooth LE radio, RTC, sensor hub) without compromising regulation. |
Applications
| Wireless Headsets | Portable Medical Sensors |
|---|---|
|
Use Scenario: Compact Bluetooth audio device with Li-ion battery, USB recharging, and dual-rail analog/digital circuitry. IC Role / Device Role / Timing Role: LTC3552EDHC#PBF serves as sole power management IC - linear charger + dual buck regulators - eliminating need for discrete PMIC. Use Value: Enables 5mm × 3mm board footprint; Burst Mode extends talk time by 35% vs. fixed-frequency operation at 10mA load. |
Use Scenario: Wearable ECG patch requiring long shelf life, USB-programmable calibration, and low-noise analog rails. IC Role / Device Role / Timing Role: LTC3552EDHC#PBF provides isolated 1.8V digital and 3.3V analog supplies with <10mVpp ripple in pulse-skipping mode. Use Value: 0.6V reference accuracy (±0.012V) ensures ADC reference stability; <2µA sleep current preserves 10-year shelf life. |
| USB-Powered PDAs | Smart Remote Controls |
|
Use Scenario: Handheld organizer with touch interface, microSD slot, and 24-hour runtime requirement. IC Role / Device Role / Timing Role: LTC3552EDHC#PBF manages USB 5V input to charge battery and generate 1.2V core and 3.3V I/O rails. Use Value: Thermal regulation allows 950mA fast charge even in sealed plastic enclosure; soft-start prevents USB port overcurrent trips. |
Use Scenario: IR/Bluetooth universal remote with coin-cell backup and firmware OTA updates via USB. IC Role / Device Role / Timing Role: LTC3552EDHC#PBF acts as USB-to-battery charger and generates 1.8V MCU rail and 3.0V RF transmitter rail. Use Value: Automatic recharge maintains full battery during infrequent use; POR output sequences MCU boot after power restoration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charger + dual DC/DC regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1555ETA+ | Single-output buck (not dual); 500mA max charge; no thermal regulation; 10-lead µDFN | Limited to simpler systems needing only one regulated rail; unsuitable for multi-rail portable designs | Select when board space is extremely constrained and dual-buck functionality is unnecessary. |
| BQ24195RGER | Integrated USB switch; 2MHz switching; only single buck output; I2C programmable; 24-pin QFN | Requires external regulator for second rail; supports USB OTG but lacks autonomous recharge logic | Choose when host-controlled charging and USB host mode are required, and second rail can be added externally. |
Compared with MAX1555ETA+ and BQ24195RGER, the LTC3552EDHC#PBF uniquely combines dual independent buck regulators, autonomous thermal-regulated charging, and USB-compliant input handling in a single 5mm × 3mm DFN - reducing total solution size by ≥35% versus multi-chip alternatives.
Availability
LTC3552EDHC#PBF is available at Aetrix Electronics and suitable for wireless headsets, portable medical sensors, and USB-powered PDAs requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3552EDHC#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 acquired Linear Technology in 2017 and maintains its high-performance analog and power management portfolio with rigorous automotive- and industrial-grade qualification.
The LTC3552EDHC#PBF belongs to Linear's legacy Power Management family, engineered specifically for space-constrained portable electronics needing integrated Li-ion charging and multi-rail DC/DC conversion without microcontroller dependency.
FAQ
What is the maximum charge current supported by the LTC3552EDHC#PBF?
The LTC3552EDHC#PBF supports up to 950mA charge current when RPROG = 2kΩ and thermal conditions permit. This value is programmable downward using higher-value RPROG resistors (e.g., 10kΩ yields ~100mA). Thermal regulation automatically reduces current above ~120°C junction temperature to prevent damage, making the actual delivered current dependent on PCB thermal design.
Does the LTC3552EDHC#PBF require an external blocking diode?
No, the LTC3552EDHC#PBF does not require an external blocking diode. Its internal P-channel MOSFET architecture inherently prevents reverse current flow from the battery to the input supply, satisfying USB power specification requirements without additional components.
How is the charge termination threshold set on the LTC3552EDHC#PBF?
The charge termination threshold on the LTC3552EDHC#PBF is set by connecting a precision resistor (RTERM) between the ITERM pin and ground. With RTERM = 1kΩ, termination occurs at 100mA; with RTERM = 5kΩ, it occurs at 20mA. The relationship is ITERM = 100mA / RTERM(kΩ), enabling precise C-rate-based cutoff for different cell capacities.
Can both buck regulators on the LTC3552EDHC#PBF operate simultaneously?
Yes, both buck regulators on the LTC3552EDHC#PBF can operate simultaneously and independently. Each has dedicated RUN and VFB pins, allowing separate enable/disable control and distinct output voltages (e.g., 1.2V and 3.3V). They share the same 2.25MHz clock and operate in-phase, minimizing beat-frequency interference.
What is the purpose of the exposed thermal pad on the LTC3552EDHC#PBF package?
The exposed thermal pad (Pin 17) on the LTC3552EDHC#PBF is electrically GND and serves as the primary thermal conduction path. It must be soldered to a PCB ground plane to achieve the specified θJA = 40°C/W. Without this connection, thermal resistance increases significantly, causing premature thermal regulation and potential reliability issues during sustained 950mA charging.
LTC3552EDHC#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Current
- Fault Protection:
- -
- Charge Current - Max:
- 950mA
- Battery Pack Voltage:
- 4.2V
- Voltage - Supply (Max):
- 8V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DFN (5x3)
LTC3552EDHC#PBF FAQ
1.How can I place an order for LTC3552EDHC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3552EDHC#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 LTC3552EDHC#PBF reliable?
The price and inventory of LTC3552EDHC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3552EDHC#PBF is usually 5 days.
3.What payment methods are accepted for LTC3552EDHC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3552EDHC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3552EDHC#PBF?
LTC3552EDHC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3552EDHC#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 LTC3552EDHC#PBF?
For technical support, including LTC3552EDHC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3552EDHC#PBF requirements.
6.How does Aetrix verify that LTC3552EDHC#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3552EDHC#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 LTC3552EDHC#PBF meets industry standards.
7.What is the process for return or replacement of LTC3552EDHC#PBF?
All LTC3552EDHC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3552EDHC#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 LTC3552EDHC#PBF part is unused and in its original packaging.
Return procedure for LTC3552EDHC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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