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Microchip - USB Dual-Port Power Switch and Current Monitor

Numéro de référence UCS2112
Description USB Dual-Port Power Switch and Current Monitor
Fabricant Microchip 
Logo Microchip 





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UCS2112 fiche technique
UCS2112
USB Dual-Port Power Switch and Current Monitor
Features
• Dual-Port Power Switches:
- 2.9V to 5.5V source voltage range
- 3.0A continuous current per VBUS port with
40 mOn resistance per switch
- Independent port power switch enable pins
- DUAL fault ALERT# active drain output pins
- Constant Current or Trip mode current
limiting behaviors
- Undervoltage and overvoltage lockout
- Back-drive, back-voltage protection
- Auto-recovery fault handling with low test
current
- BOOST# logic output to increase DC-DC
converter output under large load conditions
- A_DET# open-drain outputs for device attach
detection per port
• SMBus 2.0/I2CMode Features:
- Eight programmable current limits assignable
to each power switch
- Other SMBus addresses available upon
request
- Block read and block write
• Self-contained current monitoring (no external
sense resistor required)
• Fully programmable per-port charge rationing and
behaviors
• Per-port BC1.2 VBUS Discharge Function
• Wide Operating Temperature Range:
- -40°C to +105°C
• UL recognized and EN/IEC 60950-1 (CB) certified.
Description
The UCS2112 is a dual USB port power switch
configuration which can provide 3.0A continuous
current (3.4A maximum) per VBUS port with precision
overcurrent limiting (OCL), port power switch enables,
auto-recovery fault handling, undervoltage and
overvoltage lockout, back-drive protection and
back-voltage protection, and dynamic thermal
management.
The UCS2112 is well suited for both stand-alone and
applications having SMBus/I2C communications.
For applications with SMBus, the UCS2112 provides
per-port current monitoring and eight programmable
current limits per switch, ranging from 0.53A to 3.0A
continuous current (3.4A maximum). Per-port charge
rationing is also provided ranging from 3.8 mAh to
246.3 Ah.
In Stand-alone mode, the UCS2112 provides eight
current limits for both switches, ranging from
0.53A + 0.53A to 3A + 3A total continuous current
(see Table 1-1).
Both power switches include an independent VBUS dis-
charge function and constant current mode current lim-
iting for BC1.2 applications.
The UCS2112 is available in a 4x4 mm 20-pin QFN
package.
Package Type
UCS2112
4x4 QFN*
20 19 18 17 16
PWR_EN1 1
15 PWR_EN2
A_DET#1 2
BOOST# 3
EP 14 A_DET#2
21 13 COMM_ILIM
VBUS1 4
12 VBUS2
VBUS1 5
11 VBUS2
6 7 8 9 10
* Includes Exposed Thermal Pad (EP); see Table 3-1.
2015 Microchip Technology Inc.
DS20005424B-page 1

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