LTC3556
PRODUCTIONHigh Efficiency USB Power Manager with Dual Buck and Buck-Boost DC/DCs
- Part Models
- 2
- 1ku List Price
- Starting From $7.96
Overview
Power Manager
- High Efficiency Switching PowerPath™Controller with Bat-Track™ Adaptive Output Control
- Programmable USB or Wall Current Limit (100mA/500mA/1A)
- Full Featured Li-Ion/Polymer Battery Charger
- Instant-On Operation with a Discharged Battery
- 1.5A Maximum Charge Current
- Internal 180mΩ Ideal Diode Plus External Ideal Diode Controller Powers Load in Battery Mode
- Low No-Load IQ when Powered from BAT (<30µA)
DC/DCs
- Dual High Efficiency Buck DC/DCs (400mA/400mA IOUT
- High Efficiency Buck-Boost DC/DC (1A IOUT)
- All Regulators Operate at 2.25MHz
- Dynamic Voltage Scaling on Two Buck Outputs
- I2C Control of Enables, Mode, Two VOUT Settings
- ENALL Pin with Power-Up Sequence Control
- Low No-Load Quiescent Current: 20µA Each
The LTC3556 is a highly integrated power management and battery charger IC for Li-Ion/Polymer battery applications. It includes a high efficiency current limited switching PowerPath manager with automatic load prioritization, a battery charger, an ideal diode, and three synchronous switching regulators (two bucks and one buck-boost). Designed specifically for USB applications, the LTC3556’s switching power manager automatically limits input current to a maximum of either 100mA or 500mA for USB applications or 1A for adapter-powered applications
The LTC3556’s switching input stage transmits nearly all of the 2.5W available from the USB port to the system load with minimal power wasted as heat. This feature allows the LTC3556 to provide more power to the application and eases the constraint of thermal budgeting in small spaces. The two buck regulators can provide up to 400mA each and the buck-boost can deliver 1A..
The LTC3556 is available in the low profile 28-pin (4mm × 5mm × 0.75mm) QFN surface mount package.
Applications
- HDD-Based MP3 Players, PDAs, GPS, PMPs
- Other USB-Based Handheld Products
Documentation
Data Sheet 1
User Guide 1
Technical Articles 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LTC3556EUFD#PBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LTC3556EUFD#TRPBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Feb 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products |
||
| LTC3556EUFD#PBF | PRODUCTION | |
| LTC3556EUFD#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Battery Monitors & Fuel Gauges 1 | ||
| LTC2942 | Obsolete | Battery Gas Gauge with Temperature, Voltage Measurement |
| Hot Swap Controllers 1 | ||
|
LTC4362-1 LTC4362-2 |
1.2A Overvoltage/Overcurrent Protector | |
| Ideal Diodes and PowerPath Controllers 1 | ||
| LTC2955 | RECOMMENDED FOR NEW DESIGNS | Pushbutton On/Off Controller with Automatic Turn-On |
| Temperature Sensors 1 | ||
| LTC2991 | RECOMMENDED FOR NEW DESIGNS | Octal I2C Voltage, Current, and Temperature Monitor |
Evaluation Kits
LTC3556EUFD Demo Board | High Efficiency USB Power Manager with Dual Buck-Buck Boost DC/DC
Resources
Evaluation Board for the AD5676R WLCSP