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Analog Devices Inc. LTC3552EDHC#TRPBF
- Part No.:
- LTC3552EDHC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3552EDHC#TRPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,875
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Product details
Overview
LTC3552EDHC#TRPBF from Analog Devices (formerly Linear Technology) is a standalone linear Li-ion battery charger with integrated dual synchronous buck converters for single-cell portable 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 switching frequency. It is designed for USB-powered applications including Bluetooth headsets and MP3 players.
For engineers reviewing the LTC3552EDHC#TRPBF datasheet, LTC3552EDHC#TRPBF pinout, LTC3552EDHC#TRPBF application, or LTC3552EDHC#TRPBF equivalent, key selection criteria include thermal regulation behavior, programmable charge termination threshold, dual-regulator enable control logic, and DFN-16 package thermal pad grounding requirements.
Technical Context
The LTC3552EDHC#TRPBF 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 externally programmed ITERM threshold via RTERM, while each buck output employs a 0.6V feedback reference with RUN pin enable/disable control.
Thermal regulation activates at ~120°C junction temperature to reduce charge current without shutdown; both buck regulators support Burst Mode (MODE/SYNC = VCC) or pulse-skipping mode (MODE/SYNC = GND), with POR monitoring both outputs and asserting after 117ms of stable regulation.
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 calibration. |
| Max Charge Current | Programmable up to 950mA via PROG pin resistor - enables optimization for battery capacity and PCB thermal design. |
| Buck Output Range | 0.6V to 5V per regulator - supports core logic (1.2V/1.8V), I/O (2.5V/3.3V), and analog rails from single VCC input. |
| Switching Frequency | 2.25MHz (±25%) - allows use of compact 2.2µH/4.7µH inductors and ceramic output capacitors. |
| Quiescent Current | 40µA per buck regulator in sleep mode - minimizes standby power loss in always-on subsystems. |
| Thermal Regulation Threshold | Junction temperature limit of 120°C - dynamically scales charge current to prevent overheating on dense layouts. |
| Input Voltage Range (VIN) | 4.25V to 8V - compatible with 5V USB sources and wall adapters while supporting up to 20% input tolerance. |
Pinout & Package
Package: 16-lead (5mm × 3mm × 0.75mm) plastic DFN with exposed ground pad (Pin 17), θJA = 40°C/W when pad is soldered to PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITERM (1) | Charge termination current setting | Connects to ground via RTERM to set termination threshold (e.g., 100mA with 1kΩ); enables precise C/10 cutoff. |
| BAT (2) | Battery connection node | Direct interface to single-cell Li-ion anode; internal precision divider sets 4.2V float; sinks up to 1A during charge. |
| CHRG (3) | Open-drain charge status indicator | Pulled low during active charging; high-impedance when terminated or disabled - drives LED without external transistor. |
| MODE/SYNC (4) | Buck operation mode control | Tied to VCC for Burst Mode (high efficiency at light load); tied to GND for pulse-skipping (low noise); not floating. |
| SW2 (5) | Regulator 2 switch node | Connects to inductor; swings between VCC and GND; requires low-ESR ceramic capacitor to ground for EMI control. |
| POR (6) | Power-on reset open-drain output | Pulled low if either VFB drops >8.5% below 0.6V; asserts high after 262,144 clock cycles (~117ms) in regulation. |
| RUN2 (7) | Regulator 2 enable input | Logic-high enables Reg2; logic-low disables it - allows independent power sequencing of dual rails. |
| VFB2 (8) | Regulator 2 feedback input | Monitors output via resistive divider; regulated at 0.6V - sets VOUT2 = 0.6V × (1 + R1/R2). |
| VFB1 (9) | Regulator 1 feedback input | Same function as VFB2; enables independent output voltage programming for asymmetric rail requirements. |
| RUN1 (10) | Regulator 1 enable input | Enables/disables Reg1 independently - supports dynamic rail activation (e.g., wake-on-RF). |
| VCC (11) | Buck regulators input supply | 2.5V–5.5V input for both converters; must be decoupled with ≥10µF ceramic near pin. |
| SW1 (12) | Regulator 1 switch node | Identical role to SW2; requires separate LC filter to avoid cross-coupling between outputs. |
| PROG (13) | Charge current programming & monitor | 1V servo point during CC mode; IBAT = 1000 × VPROG - enables real-time gas gauging without sense resistor. |
| VIN (14) | Charger input supply | 4.25V–8V input; UVLO at 3.8V with 200mV hysteresis; enters shutdown if VIN ≤ VBAT + 100mV. |
| PWR (15) | Power present open-drain output | Pulled low when VIN > UVLO and VIN > VBAT + 100mV - signals valid input source to system controller. |
| EN (16) | Charger enable input | Logic-high forces shutdown (<2µA battery drain); internal 2MΩ pull-down enables default operation when floating. |
| Exposed Pad (17) | Ground reference & thermal path | Mandatory PCB solder connection - primary thermal conduction path; failure to solder raises θJA significantly. |
Key Features
| Feature | Design Value |
|---|---|
| No external sense resistor or blocking diode | Reduces BOM count and PCB area by integrating P-MOSFET charger with internal current sensing and reverse-current protection. |
| Programmable charge current termination | Enables precise C-rate cutoff (e.g., C/10) using RTERM, improving battery longevity and safety in cycle-limited applications. |
| Charge current monitor output (PROG pin) | Provides analog voltage proportional to IBAT (1V = 1A), enabling fuel-gauging functionality without adding sense resistor or ADC channel. |
| Automatic recharge at ~4.10V | Reinitiates charge when battery voltage drops 100mV below float voltage - maintains >90% state-of-charge without host intervention. |
| 2.25MHz constant-frequency switching | Permits use of sub-3mm inductors and low-ESR ceramics, reducing solution size by >40% vs. 500kHz alternatives. |
| Thermal regulation at 120°C | Actively throttles charge current before reaching destructive temperatures, allowing aggressive thermal design without derating. |
Applications
| Bluetooth Headset Power Management | USB-Powered Portable Media Player |
|---|---|
Use Scenario: Compact wearable audio device powered from USB or battery, requiring simultaneous charging and dual-rail operation (1.2V DSP + 3.3V codec). IC Role / Device Role / Timing Role: LTC3552EDHC#TRPBF serves as single-chip power manager: linear charger conditions Li-ion cell while dual bucks supply processor and audio subsystems. Use Value: Eliminates discrete charger + dual LDOs, reducing footprint by 65% and enabling <12mm² solution size in QFN-constrained designs. |
Use Scenario: Handheld MP3 player with USB charging, OLED display, and stereo DAC, needing efficient conversion from 5V USB to 1.8V core and 2.5V I/O rails. IC Role / Device Role / Timing Role: LTC3552EDHC#TRPBF acts as integrated power source: charges battery at up to 950mA while regulating two independent output voltages. Use Value: Achieves >85% efficiency at 200mA load per rail in Burst Mode, extending playback time by 18% vs. linear solutions. |
| Smart Remote with Rechargeable Battery | Low-Power IoT Sensor Node |
Use Scenario: IR/RF remote control with embedded Li-ion battery, USB recharging, and button-triggered wake-up of microcontroller and transceiver. IC Role / Device Role / Timing Role: LTC3552EDHC#TRPBF provides always-on 3.3V rail (Reg1) and switched 1.8V rail (Reg2) synchronized to MCU activity. Use Value: RUN1/RUN2 pins allow dynamic rail enable/disable, cutting system quiescent current to <10µA during deep sleep. |
Use Scenario: Battery-operated environmental sensor node that wakes periodically to sample and transmit data, then returns to ultra-low-power sleep. IC Role / Device Role / Timing Role: LTC3552EDHC#TRPBF supplies regulated 3.3V to MCU and radio while maintaining <2µA battery drain in shutdown mode. Use Value: CHRG and PWR pins provide host-readable status flags; thermal regulation prevents overtemperature during solar-assisted charging. |
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 |
|---|---|---|---|
| BQ24195RGER | Switch-mode charger (not linear); higher peak efficiency but requires external inductor; fixed 4.2V float; no PROG-based current monitor. | Preferred for thermally constrained designs where >1A charge current is needed; less suitable for noise-sensitive audio rails. | Select BQ24195RGER when board space allows inductor placement and higher charge rates (>1A) are required; LTC3552EDHC#TRPBF remains optimal for ultra-compact, low-noise, USB-native designs. |
| MAX1555ETA+ | Single-output linear charger only; no integrated DC/DC converters; 500mA max charge current; no programmable termination or thermal regulation. | Suitable only for simple charging-only functions; requires external regulators for system rails. | Choose MAX1555ETA+ only for cost-sensitive, single-rail applications where dual-buck integration is unnecessary; LTC3552EDHC#TRPBF delivers full power management in one package. |
Compared with BQ24195RGER and MAX1555ETA+, the LTC3552EDHC#TRPBF uniquely combines linear charging simplicity, dual synchronous buck integration, and real-time charge current monitoring - making it the only solution that meets USB power spec compliance while delivering two fully independent, enable-controlled rails in a 5mm × 3mm DFN.
Availability
LTC3552EDHC#TRPBF is available at Aetrix Electronics and suitable for Bluetooth headsets, portable media players, smart remotes, and low-power IoT sensor nodes requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3552EDHC#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 and maintains its precision analog and power management portfolio with rigorous automotive-grade process controls and reliability testing.
The LTC3552EDHC#TRPBF belongs to Linear's legacy µPower™ battery management IC family, engineered specifically for space-constrained portable electronics requiring integrated charging and multi-rail DC/DC conversion without compromising thermal or noise performance.
FAQ
What is the maximum charge current supported by the LTC3552EDHC#TRPBF?
The LTC3552EDHC#TRPBF supports programmable charge current up to 950mA using a resistor on the PROG pin. This value assumes adequate PCB copper area for thermal dissipation; actual achievable current depends on ambient temperature and layout. The device implements thermal regulation at ~120°C to automatically scale back current and prevent damage, making LTC3552EDHC#TRPBF robust in compact enclosures.
Does the LTC3552EDHC#TRPBF require external MOSFETs or a sense resistor for charging?
No, the LTC3552EDHC#TRPBF integrates a P-channel power MOSFET and proprietary current-sensing architecture, eliminating the need for external sense resistors, blocking diodes, or discrete FETs. This reduces total solution size and component count while maintaining ±1% float voltage accuracy and programmable termination - a key differentiator of the LTC3552EDHC#TRPBF versus basic charger ICs.
How does the LTC3552EDHC#TRPBF handle low-battery conditions during charging?
When the BAT pin voltage falls below 2.9V, the LTC3552EDHC#TRPBF initiates trickle charge at ~10% of the programmed current to safely raise cell voltage before full-rate charging. Once BAT exceeds 2.9V, it transitions to constant-current mode. This behavior is built into the LTC3552EDHC#TRPBF's analog control loop and requires no host firmware intervention.
Can both buck regulators on the LTC3552EDHC#TRPBF operate at different output voltages?
Yes, the LTC3552EDHC#TRPBF supports independent output programming: VOUT1 is set by the resistor divider on VFB1, and VOUT2 by the divider on VFB2. Each output can be configured from 0.6V to 5V, enabling asymmetric rail generation (e.g., 1.2V for core logic and 3.3V for peripherals) - a capability confirmed in the LTC3552EDHC#TRPBF datasheet Figure 2 and electrical characteristics table.
What is the purpose of the MODE/SYNC pin on the LTC3552EDHC#TRPBF?
The MODE/SYNC pin on the LTC3552EDHC#TRPBF selects between Burst Mode (pin tied to VCC) for highest light-load efficiency or pulse-skipping mode (pin tied to GND) for lower output ripple. It also accepts external clock signals for synchronization. This dual-function pin gives designers direct control over noise-efficiency trade-offs - a feature explicitly documented in the LTC3552EDHC#TRPBF functional description and typical performance curves.
LTC3552EDHC#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#TRPBF FAQ
1.How can I place an order for LTC3552EDHC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3552EDHC#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#TRPBF reliable?
The price and inventory of LTC3552EDHC#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3552EDHC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3552EDHC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3552EDHC#TRPBF?
LTC3552EDHC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3552EDHC#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#TRPBF?
For technical support, including LTC3552EDHC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3552EDHC#TRPBF requirements.
6.How does Aetrix verify that LTC3552EDHC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3552EDHC#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3552EDHC#TRPBF?
All LTC3552EDHC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3552EDHC#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3552EDHC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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