DC1296A Demonstration Circuit for LTC3556 USB Power Manager
Demonstration circuit DC1296A featuring the LTC3556, a USB PowerPath manager with a Li-Ion battery charger, two 400mA buck regulators, and one 1A buck-boost converter.
Overview
The DC1296A demonstration circuit features the LTC3556, a highly integrated power management and battery charger IC designed for Li-Ion/polymer battery applications. The circuit includes a high-efficiency switching PowerPath manager with automatic load prioritization, a battery charger, an ideal diode, and three synchronous switching regulators: two 400mA buck regulators and one 1A buck-boost regulator. It is optimized for USB applications with programmable input current limits of 100mA, 500mA, or 1A for AC power. The document details operating principles, including I2C-controlled output voltage adjustment, push-button startup, and programmable regulator sequencing via the SEQ pin. It also provides guidance on using the software GUI and QuikEval system for device evaluation.
Use Cases
- Li-Ion/Polymer battery-powered handheld devices
- USB-powered portable electronics
- GPS navigators
- Portable media players
- Multi-rail power management systems
Topics
Referenced Parts
DF3-3P-2DSA
Hirose
J2 DF3-3P-2DSA
LTC3556EUFD
Linear Technology
Demonstration Circuit DC1296A is a High Efficiency USB Power Manager + Dual Buck + Buck-Boost Converters featuring the LTC3556. ... The LTC3556EUFD is available in a 28-pin (4mm x 5mm x 0.75mm) QFN surface mount package.
Si2333DS
Vishay Siliconix
Q1 Si2333DS
LTC3556
Linear Technology
The LTC3556 is a highly integrated power management and battery charger IC for Li-Ion/polymer battery applications.
LTC3566
Linear Technology
The LTC3566 also contains an integrated Buck regulator that can provide the pre-regulation function, called BatTrack™, from the USB input supply.
| LPS4018-222MLC | Coilcraft | L1 2.2uH LPS4018-222MLC |
| 24LC025I/ST | Microchip | U2 24LC025I/ST 256X8 |
| 1098AS-4R7M | Murata | L2 4.7uH 1098AS-4R7M ... L3 4.7uH 1098AS-4R7M |
| LPS4018-332 | Coilcraft | L4 3.3uH LPS4018-332 |
| DF3-3P-2DSA | Hirose | J2 DF3-3P-2DSA |
| LTC3556EUFD | Linear Technology | Demonstration Circuit DC1296A is a High Efficiency USB Power Manager + Dual Buck + Buck-Boost Converters featuring the LTC3556. ... The LTC3556EUFD is available in a 28-pin (4mm x 5mm x 0.75mm) QFN surface mount package. |
| Si2333DS | Vishay Siliconix | Q1 Si2333DS |
| LTC3556 | Linear Technology | The LTC3556 is a highly integrated power management and battery charger IC for Li-Ion/polymer battery applications. |
| LTC3566 | Linear Technology | The LTC3566 also contains an integrated Buck regulator that can provide the pre-regulation function, called BatTrack™, from the USB input supply. |