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Analog Devices Inc. LTC3552EDHC-1#TRPBF
- Part No.:
- LTC3552EDHC-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3552EDHC-1#TRPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,929
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Product details
Overview
LTC3552EDHC-1#TRPBF from Analog Devices (formerly Linear Technology) is a standalone linear Li-ion battery charger with dual synchronous buck converters in a 16-lead DFN package. It delivers up to 950mA charge current at 4.2V ±1% float voltage, and provides fixed 1.8V/800mA and 1.575V/400mA DC/DC outputs - all optimized for USB-powered portable electronics including cellular phones, Bluetooth headsets, and MP3 players.
For engineers reviewing the LTC3552EDHC-1#TRPBF datasheet, LTC3552EDHC-1#TRPBF pinout, LTC3552EDHC-1#TRPBF application, or LTC3552EDHC-1#TRPBF equivalent, key selection considerations include thermal regulation behavior, C/5 charge termination programmability, dual-regulator burst-mode efficiency at light loads, and integrated MOSFET architecture eliminating external sense resistors and blocking diodes.
Technical Context
The LTC3552EDHC-1#TRPBF integrates two independent functional blocks: a constant-current/constant-voltage linear charger with internal P-channel MOSFET and thermal foldback at ~120°C, and two current-mode synchronous buck regulators operating at 2.25MHz with in-phase switching. Both regulators feature integrated main (P-MOSFET) and synchronous (N-MOSFET) switches, fixed feedback dividers, and 0.6V reference comparators.
Charge control uses PROG pin servoing to 1.0V in CC mode and ITERM pin monitoring with 1ms filtered comparator for termination; regulator enable is managed via RUN1/RUN2 pins with defined threshold (0.3–1.5V), while PWR and CHRG provide open-drain status outputs tied to VIN presence and active charging state respectively.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Voltage | Fixed 4.2V ±1% float voltage - ensures safe full charge of single-cell Li-ion without external voltage-setting components. |
| Max Charge Current | Programmable up to 950mA via PROG resistor - enables fast charging while maintaining thermal safety on standard PCB layouts. |
| Buck Outputs | 1.8V @ 800mA and 1.575V @ 400mA - directly powers core logic and low-voltage peripherals without external feedback networks. |
| Switching Frequency | 2.25MHz ±25% - allows use of compact 2.2µH and 4.7µH inductors plus ceramic output capacitors. |
| Quiescent Current | 40µA per buck converter in active mode - minimizes standby power loss in always-on subsystems. |
| Thermal Regulation | Active foldback above ~120°C junction temperature - prevents overheating without external thermal sensors or shutdown sequencing. |
| Input Range | VIN: 4.25V to 8V; VCC: 2.5V to 5.5V - supports direct USB 5V operation and accommodates wall adapters up to 8V. |
Pinout & Package
Package: 16-lead (5mm × 3mm × 0.75mm) plastic DFN with exposed ground pad (Pin 17) requiring PCB soldering for thermal performance (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITERM (1) | Charge Termination Threshold Input | Accepts resistor-to-ground to set termination current (e.g., 100mA with 1kΩ); filtered comparator triggers end-of-charge when voltage drops below 100mV for ≥1ms. |
| BAT (2) | Battery Connection Node | Direct connection to Li-ion anode; internal precision divider sets 4.2V float voltage; disconnects in shutdown to limit battery drain to <2µA. |
| CHRG (3) | Open-Drain Charge Status Output | Pulled low during active charging; high-impedance when cycle complete or disabled - drives LED indicators without external pull-up. |
| RUN2 (4) | Regulator 2 Enable Control | Logic-high (>0.7V) enables 1.575V/400mA buck; grounded disables output - allows dynamic power gating of secondary rail. |
| SW2 (5) | Regulator 2 Switch Node | Connects to inductor; swings between VCC and GND at 2.25MHz - requires low-ESR ceramic capacitor and proper layout to minimize EMI. |
| RUN1 (6) | Regulator 1 Enable Control | Logic-high enables 1.8V/800mA buck; floating not allowed - supports independent on/off control of primary system rail. |
| VOUT2 (7) | Regulator 2 Feedback Tap | Internal 195k/120k divider sets 1.575V output - no external resistors needed; connects to output capacitor for stability. |
| VFB2 (8) | Regulator 2 Error Amplifier Input | Receives divided output (0.6V nominal); compared to internal 0.6V reference to regulate VOUT2 - used for loop compensation if required. |
| VFB1 (9) | Regulator 1 Error Amplifier Input | Receives divided output (0.6V nominal); compared to same 0.6V reference - identical architecture to VFB2 but for 1.8V rail. |
| VOUT1 (10) | Regulator 1 Feedback Tap | Internal 240k/120k divider sets 1.8V output - eliminates external feedback network and associated layout sensitivity. |
| VCC (11) | Buck Regulators Supply Input | Power source for both switchers (2.5–5.5V); must be decoupled with ≥10µF ceramic capacitor near pin to suppress switching noise. |
| SW1 (12) | Regulator 1 Switch Node | Connects to inductor; same switching behavior as SW2 but for 1.8V rail - requires symmetric layout to avoid cross-coupling. |
| PROG (13) | Charge Current Program & Monitor | Servo to 1.0V in CC mode; charge current = 1000 × VPROG/RPROG; also enables real-time gas gauging via voltage measurement. |
| VIN (14) | Charger Input Supply | Accepts 4.25–8V (USB-compliant); enters shutdown if within 100mV of BAT voltage - prevents reverse current without external diode. |
| PWR (15) | Power Present Open-Drain Output | Pulled low when VIN > UVLO (3.8V) AND VIN > VBAT + 100mV - signals valid input power for system-level power management. |
| EN (16) | Global Enable Input | Logic-high forces shutdown (<2µA battery drain); internal 2MΩ pull-down enables default operation when floating - simplifies host control interface. |
| Exposed Pad (17) | Ground Reference & Thermal Path | Must be soldered to PCB ground plane - critical for achieving rated θJA and sustaining 950mA charge current without thermal derating. |
Key Features
| Feature | Design Value |
|---|---|
| No external sense resistor or blocking diode | Integrated P-channel MOSFET and precision current-sense architecture eliminate discrete components, reducing BOM count and PCB area by ~30% versus discrete solutions. |
| Thermal regulation at ~120°C | Automatic charge current reduction prevents die overheating - enables aggressive charging profiles on compact boards without thermal sensors or firmware intervention. |
| Dual fixed-output buck regulators | 1.8V/800mA and 1.575V/400mA outputs with integrated feedback dividers - removes need for 4 external resistors and simplifies layout for multi-rail systems. |
| 2.25MHz constant-frequency operation | Enables use of sub-3mm inductors and 10µF ceramic capacitors - achieves high efficiency (>85%) in space-constrained applications like wearables and handhelds. |
| Charge current monitor output | PROG pin voltage directly correlates to instantaneous charge current (IBAT = 1000 × VPROG/RPROG) - supports accurate fuel gauging without additional ADC channels. |
| Automatic recharge at ~4.10V | Reinitiates charge when battery voltage drops 100mV below float voltage - maintains battery at >90% capacity without host processor involvement. |
Applications
| Cellular Handset Power Management | Bluetooth Headset System Rail |
|---|---|
Use Scenario: Compact smartphone design requiring USB-compatible charging and dual regulated rails for application processor (1.8V) and RF transceiver (1.575V). IC Role / Device Role / Timing Role: Single-chip power management IC providing Li-ion charging control and two independent DC/DC conversion paths. Use Value: Reduces component count by integrating charger + dual bucks, enabling thinner form factors while meeting USB-IF power delivery compliance. | Use Scenario: Battery-powered Bluetooth headset needing ultra-low quiescent current during standby and fast wake-up from charging events. IC Role / Device Role / Timing Role: Primary power source managing battery charge state and delivering stable 1.8V core and 1.575V audio codec supplies. Use Value: Burst Mode operation cuts buck quiescent current to 40µA, extending standby time beyond 72 hours on a 120mAh cell. |
| MP3 Player Audio Subsystem | Portable Medical Sensor Hub |
Use Scenario: Portable media player with OLED display, stereo DAC, and microSD interface requiring clean, low-noise power rails. IC Role / Device Role / Timing Role: Dual-output regulator supplying 1.8V for digital logic and 1.575V for analog audio circuitry with minimal PSRR impact. Use Value: 2.25MHz switching frequency places noise spectrum beyond audio band, eliminating need for additional LC filtering on sensitive analog rails. | Use Scenario: Wearable vital sign monitor using optical heart-rate sensor and BLE radio, powered by coin-cell or small Li-ion battery. IC Role / Device Role / Timing Role: Integrated charger and dual-buck controller enabling single-battery operation with automatic top-off and load-dependent efficiency optimization. Use Value: Thermal regulation prevents skin-temperature rise during charging, satisfying IEC 62368-1 safety requirements for wearable devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output Li-ion charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24160RGZR | Single 1.8V buck output only; no second fixed rail; uses external N-MOSFET for charging; 4.2V float accuracy ±0.5%. | Requires external regulator for 1.575V rail; higher external component count; lacks integrated thermal regulation. | Select when only one regulated rail is needed and higher charge accuracy is prioritized over integration. |
| MAX8855ETE+ | Dual adjustable bucks (not fixed); 4.2V charger with ±0.75% float accuracy; no PROG-based current monitoring; 1.5MHz switching. | Requires external feedback resistors for both outputs; no built-in gas gauging capability; lower switching frequency increases inductor size. | Select when output voltages must be customized or when legacy 1.5MHz magnetics are already qualified. |
Compared with BQ24160RGZR and MAX8855ETE+, the LTC3552EDHC-1#TRPBF uniquely combines fixed dual outputs, integrated charge current monitoring, and thermal foldback in a single DFN - reducing total solution size by ≥40% and eliminating three external resistors and one inductor versus split-IC approaches.
Availability
LTC3552EDHC-1#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, Bluetooth headsets, MP3 players, and portable medical sensors requiring stable component supply, USB-compliant charging, and dual low-noise power rails.
Supply support for LTC3552EDHC-1#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3552EDHC-1#TRPBF belongs to Linear's PowerPath™ family of integrated battery management ICs, designed specifically for space-constrained portable devices needing combined charging and multi-rail DC/DC conversion without external passive components.
FAQ
What is the maximum charge current supported by the LTC3552EDHC-1#TRPBF?
The LTC3552EDHC-1#TRPBF supports programmable charge current up to 950mA using an external resistor on the PROG pin. This maximum assumes adequate PCB thermal design (exposed pad soldered, copper area ≥200mm²). At ambient temperatures above 60°C or with limited copper, thermal regulation reduces current to maintain junction temperature ≤120°C - ensuring safe operation without external thermal management.
Does the LTC3552EDHC-1#TRPBF require external feedback resistors for its buck regulators?
No, the LTC3552EDHC-1#TRPBF does not require external feedback resistors. Its 1.8V and 1.575V outputs are set by internal precision resistor dividers (240k/120k and 195k/120k respectively), referenced to a 0.6V internal bandgap. This eliminates four external resistors, reduces layout sensitivity, and improves long-term output voltage stability versus discrete resistor networks.
How does the LTC3552EDHC-1#TRPBF handle battery recharge after full charge termination?
The LTC3552EDHC-1#TRPBF automatically recharges the battery when its voltage falls to approximately 4.10V - a 100mV drop below the 4.2V float voltage. This occurs via an internal comparator with 2ms filter time (tRECHRG). The CHRG pin pulls low again during recharge, and the cycle repeats - maintaining battery capacity above 90% without host intervention or periodic manual reinitiation.
Can the LTC3552EDHC-1#TRPBF operate from a standard USB port?
Yes, the LTC3552EDHC-1#TRPBF is explicitly designed to operate from a standard USB port. Its VIN range (4.25V to 8V) accepts USB 5V ±10%, and its input current draw stays within USB 2.0 specification limits during charging. The device enters low-power shutdown (<2µA battery drain) when VIN drops below 3.8V or falls within 100mV of BAT voltage - preventing backfeed and ensuring USB compliance.
What is the purpose of the ITERM pin on the LTC3552EDHC-1#TRPBF?
The ITERM pin on the LTC3552EDHC-1#TRPBF sets the charge termination threshold current. Connecting a resistor (e.g., 1kΩ) from ITERM to ground programs termination at 100mA. An internal comparator monitors this pin; when voltage drops below 100mV for ≥1ms (tTERM), charging stops and the device enters standby. Alternatively, shorting ITERM to PROG configures C/10 termination relative to programmed charge current.
LTC3552EDHC-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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-1#TRPBF FAQ
1.How can I place an order for LTC3552EDHC-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3552EDHC-1#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 LTC3552EDHC-1#TRPBF reliable?
The price and inventory of LTC3552EDHC-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3552EDHC-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3552EDHC-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3552EDHC-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3552EDHC-1#TRPBF?
LTC3552EDHC-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3552EDHC-1#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 LTC3552EDHC-1#TRPBF?
For technical support, including LTC3552EDHC-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3552EDHC-1#TRPBF requirements.
6.How does Aetrix verify that LTC3552EDHC-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3552EDHC-1#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 LTC3552EDHC-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3552EDHC-1#TRPBF?
All LTC3552EDHC-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3552EDHC-1#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 LTC3552EDHC-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3552EDHC-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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