2015 - 2017 Microchip Technology Inc.
DS20005424C-page 1
UCS2112
Features
• Dual-Port Power Switches:
- 2.9V to 5.5V source voltage range
- 3.0A continuous current per V
BUS
port with
40 m
On 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/I
2
C Mode 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 V
BUS
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 V
BUS
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/I
2
C 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 V
BUS
discharge function and constant current mode current
limiting for BC1.2 applications.
The UCS2112 is available in a 4x4 mm 20-pin QFN
package.
Package Type
AL
E
R
T#
2
2
BOOST#
V
BUS1
PWR_EN1
PWR_EN2
A_DET#2
V
S
COMM_ILIM
V
S
V
DD
V
S
V
BUS2
AL
E
R
T#
1
GND
SM
D
A
TA
SM
C
L
K
A_DET#1
EP
20
1
19 18 17
3
4
14
13
12
11
6
7
8
9
21
5
10
15
16
V
BUS1
V
S
V
BUS2
UCS2112
4x4 QFN*
*
Includes Exposed Thermal Pad (EP); see
Table 3-1
.
USB Dual-Port Power Switch and Current Monitor
UCS2112
DS20005424C-page 2
2015 - 2017 Microchip Technology Inc.
Block Diagram
Charger
Control,
Measurement,
OCL
In
te
rfa
ce Lo
gic
SMCLK
SMDATA
PWR_EN2
Power
Switch 2
Temp.
ALERT#2
V
BUS
GND
COMM_ILIM
Power
Switch 1
V
BUS
V
S
UVLO,
OVLO
PWR_EN1
BOOST#
ALERT#1
A_DET#2
A_DET#1
V
BUS
discharge
V
DD
V
S
2015 - 2017 Microchip Technology Inc.
DS20005424C-page 3
UCS2112
1.0
ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings †
Voltage on V
DD
, V
S
, and V
BUS
pins .................................................................................................................-0.3 to +6V
Pull-Up Voltage (V
PULLUP
) ..................................................................................................................... -0.3 to V
DD
+ 0.3
Port Power Switch Current ..................................................................................................................... Internally limited
Voltage on any Other Pin to Ground ...................................................................................................-0.3 to V
DD
+ 0.3V
Current on any Other Pin ..................................................................................................................................... ±10 mA
Package Power Dissipation ........................................................................................................................ See
Table 1-1
Operating Ambient Temperature Range.................................................................................................-40°C to +105°C
Storage Temperature Range ..................................................................................................................-55°C to +150°C
† Notice: Stresses above those listed under “Maximum Ratings” may cause permanent damage to the device. This is
a stress rating only and functional operation of the device at those or any other conditions above those indicated in the
operation listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may
affect device reliability.
TABLE 1-1:
POWER DISSIPATION SUMMARY
Board
Package
JC
JA
De-Rating Factor
above +25°C
T
A
< +25°C
Power Rating
T
A
= +70°C
Power Rating
T
A
= +85°C
Power Rating
High K
(
Note 1
)
20-pin QFN
4x4 mm
6 °C/W
41 °C/W
24.4 mW/°C
2193 mW
1095 mW
729 mW
Low K
(
Note 1
)
20-pin QFN
4x4 mm
6 °C/W
60 °C/W
16.67 mW/°C
1498 mW
748 mW
498 mW
Note 1:
A High K board uses a thermal via design with the thermal landing soldered to the PCB ground plane with
0.3 mm (12 mil) diameter vias in a 3x3 matrix (9 total) at 0.5 mm (20 mil) pitch. The board is multi-layer
with 1-ounce internal power and ground planes and 2-ounce copper traces on top and bottom. A Low K
board is a two-layer board without thermal via design with 2-ounce copper traces on the top and bottom.
TABLE 1-2:
ELECTRICAL SPECIFICATIONS
Electrical Characteristics: Unless otherwise specified, V
DD
= 4.5V to 5.5V, V
S
= 2.9V to 5.5V,
V
PULLUP
= 3V to 5.5V, T
A
= -40°C to 105°C. All typical values at V
DD
= V
S
= 5V, T
A
= 27°C.
Characteristic
Symbol
Min.
Typ.
Max.
Unit
Conditions
Power and Interrupts – DC
Supply Voltage
V
DD
4.5
5
5.5
V
Supply Current in Active
(I
DD_ACT
+ I
S1_ACT
+ I
S2_ACT
)
I
ACTIVE
—
850
—
µA
Average current I
BUS
= 0 mA
Supply Current in Sleep
(I
DD_SLEEP
+ I
S1_SLEEP
+
I
S2_SLEEP
)
I
SLEEP
—
6
20
µA
Average current V
PULLUP
V
DD
Supply Current in Detect
(I
DD_DET
+ I
S1_DET
+ I
S2_DET
)
I
DETECT
—
200
—
µA
Average current
No portable device attached
(
Note 1
)
Note 1:
This parameter is characterized, not 100% tested.
2:
This parameter is ensured by design and not 100% tested.
3:
The current measurement full scale range maximum value is 3.4A. However, the UCS2112 cannot report
values above I
LIM
(if I
BUS_R2MIN
I
LIM
) or above I
BUS_R2MIN
(if I
BUS_R2MIN
> I
LIM
and I
LIM
1.6A).
UCS2112
DS20005424C-page 4
2015 - 2017 Microchip Technology Inc.
Power-on Reset
V
DD
Low Threshold
V
DD_TH
—
4
—
V
V
DD
voltage increasing
V
DD
Low Hysteresis
V
DD_TH_HYST
—
500
600
mV
V
DD
voltage decreasing (
Note 1
)
I/O Pins – SMCLK, SMDATA, PWR_EN, ALERT#, A_DET#, BOOST# - DC Parameters
Output Low Voltage
V
OL
—
—
0.4
V
I
SINK_IO
= 8 mA
SMDATA, ALERT#, A_DET#,
BOOST#
Input High Voltage
V
IH
2.0
—
—
V
PWR_EN, SMDATA, SMCLK
Input Low Voltage
V
IL
—
—
0.8
V
PWR_EN, SMDATA, SMCLK
Leakage Current
I
LEAK
—
—
±5
µA
Powered or unpowered
V
PULLUP
V
DD
T
A
< 85°C (
Note 1
)
Interrupt Pins – AC Parameters
ALERT# Pin Blanking Time
t
BLANK
—
25
—
ms
Blanking time, coming out of
Reset
ALERT# Pin Interrupt
Masking Time
t
MASK
—
5
—
ms
BOOST# Pin Minimum
Assertion Time
t
BOOST_MAT
—
1
—
s
BOOST# Pin Assertion
Current
I
BOOST
—
1.9
—
A
SMBus/I
2
C Timing
Input Capacitance
C
IN
—
5
—
pF
Clock Frequency
f
SMB
10
—
400
kHz
Spike Suppression
t
SP
—
—
50
ns
Bus Free Time Stop to Start
t
BUF
1.3
—
—
µs
Start Setup Time
t
SU:STA
0.6
—
—
µs
Start Hold Time
t
HD:STA
0.6
—
—
µs
Stop Setup Time
t
SU:STO
0.6
—
—
µs
Data Hold Time
t
HD:DAT
0
—
—
µs
When transmitting to the master
Data Hold Time
t
HD:DAT
0.3
—
—
µs
When receiving from the master
Data Setup Time
t
SU:DAT
0.6
—
—
µs
Clock Low Period
t
LOW
1.3
—
—
µs
Clock High Period
t
HIGH
0.6
—
—
µs
Clock / Data Fall Time
t
FALL
—
—
300
ns
Min = 20+0.1C
LOAD
ns
(
Note 1
)
Clock / Data Rise Time
t
RISE
—
—
300
ns
Min = 20+0.1C
LOAD
ns
(
Note 1
)
TABLE 1-2:
ELECTRICAL SPECIFICATIONS (CONTINUED)
Electrical Characteristics: Unless otherwise specified, V
DD
= 4.5V to 5.5V, V
S
= 2.9V to 5.5V,
V
PULLUP
= 3V to 5.5V, T
A
= -40°C to 105°C. All typical values at V
DD
= V
S
= 5V, T
A
= 27°C.
Characteristic
Symbol
Min.
Typ.
Max.
Unit
Conditions
Note 1:
This parameter is characterized, not 100% tested.
2:
This parameter is ensured by design and not 100% tested.
3:
The current measurement full scale range maximum value is 3.4A. However, the UCS2112 cannot report
values above I
LIM
(if I
BUS_R2MIN
I
LIM
) or above I
BUS_R2MIN
(if I
BUS_R2MIN
> I
LIM
and I
LIM
1.6A).
2015 - 2017 Microchip Technology Inc.
DS20005424C-page 5
UCS2112
Capacitive Load
C
LOAD
—
—
400
pF
Per bus line (
Note 1
)
Timeout
t
TIMEOUT
25
—
35
ms
Disabled by default (
Note 1
)
Idle Reset
t
IDLE_RESET
350
—
—
µs
Disabled by default (
Note 1
)
Port Power Switch
Port Power Switch – DC Parameter
Overvoltage Lockout
V
S_OV
—
6
—
V
Note 2
V
S
Low Threshold
V
S_UVLO
—
2.5
—
V
Note 2
V
S
Low Hysteresis
V
S_UVLO_HYST
—
100
—
mV
Note 2
On Resistance
R
ON_PSW
—
40
60
m
4.75V < V
S
< 5.25V
V
S
Leakage Current
I
LEAK_VS
—
—
5
µA
Sleep state into V
S
pin on one
channel (
Note 1
)
Back-Voltage Protection
Threshold
V
BV_TH
—
150
—
mV
V
BUS
> V
S
V
S
> V
S_UVLO
Back-drive Current
I
BD_1
—
0
3
µA
V
DD
< V
DD_TH
,
Leakage current from V
BUS
pins
to the V
DD
and the V
S
pins
(
Note 1
)
I
BD_2
—
0
2
µA
V
DD
> V
DD_TH
,
Leakage current from V
BUS
pins
to the V
DD
(in Detect State) or
the V
S
pins (in Active State)
(
Note 1
)
Selectable Current Limits
I
LIM1
—
530
—
mA
I
LIM
Resistor = 0 or 47 k
(530 mA setting)
I
LIM2
—
960
—
mA
I
LIM
Resistor = 10 k
or 56 k
(960 mA setting)
I
LIM3
—
1070
—
mA
I
LIM
Resistor = 12 k
or 68 k
(1070 mA setting)
I
LIM4
—
1280
—
mA
I
LIM
Resistor = 15 k
or 82 k
(1280 mA setting)
I
LIM5
—
1600
—
mA
I
LIM
Resistor = 18 k
or 100 k
(1600 mA setting)
I
LIM6
—
2130
—
mA
I
LIM
Resistor = 22 k
or 120 k
(2130 mA setting)
I
LIM7
2500
2670
2900
mA
I
LIM
Resistor = 27 k
or 150 k
(2670 mA setting)
I
LIM8
3000
3200
3400
mA
I
LIM
Resistor = 33 k
or V
DD
(3200 mA setting)
Pin Wake Time
t
PIN_WAKE
—
3
—
ms
SMBus Wake Time
t
SMB_WAKE
—
4
—
ms
TABLE 1-2:
ELECTRICAL SPECIFICATIONS (CONTINUED)
Electrical Characteristics: Unless otherwise specified, V
DD
= 4.5V to 5.5V, V
S
= 2.9V to 5.5V,
V
PULLUP
= 3V to 5.5V, T
A
= -40°C to 105°C. All typical values at V
DD
= V
S
= 5V, T
A
= 27°C.
Characteristic
Symbol
Min.
Typ.
Max.
Unit
Conditions
Note 1:
This parameter is characterized, not 100% tested.
2:
This parameter is ensured by design and not 100% tested.
3:
The current measurement full scale range maximum value is 3.4A. However, the UCS2112 cannot report
values above I
LIM
(if I
BUS_R2MIN
I
LIM
) or above I
BUS_R2MIN
(if I
BUS_R2MIN
> I
LIM
and I
LIM
1.6A).
UCS2112
DS20005424C-page 6
2015 - 2017 Microchip Technology Inc.
Idle Sleep Time
t
IDLE_SLEEP
—
200
—
ms
Thermal Regulation Limit
T
REG
—
110
—
°C
Die Temperature at which
current limit will be reduced
Thermal Regulation
Hysteresis
T
REG_HYST
—
10
—
°C
Hysteresis for t
REG
functionality.
Temperature must drop by this
value before I
LIM
value restored
to normal operation
Thermal Shutdown
Threshold
T
TSD
—
135
—
°C
Die Temperature at which port
power switch will turn off
Thermal Shutdown
Hysteresis
T
TSD_HYST
—
35
—
°C
After shutdown due to T
TSD
being reached, die temperature
drop required before port power
switch can be turned on again
Auto-Recovery Test Current
I
TEST
—
190
—
mA
Portable device attached,
V
BUS
= 0V, Die temp < T
TSD
Auto-Recovery Test Voltage
V
TEST
—
750
—
mV
Portable device attached,
V
BUS
= 0V before application,
Die temp < T
TSD
Programmable, 250 - 1000 mV,
default listed
Discharge Impedance
R
DISCHARGE
—
100
—
W
Port Power Switch – AC Parameters
Turn-On Delay
t
ON_PSW
—
200
—
ms
Depends on the V
BUS
Discharge
setting.
Programmable 100 – 400 ms,
default listed
Turn-Off Time
t
OFF_PSW_INA
—
0.75
—
ms
PWR_EN inactive toggle to
switch off time
C
BUS
= 120 µF
Turn-Off Time
t
OFF_PSW_ERR
—
1
—
ms
Over-current Error, V
BUS
Min
Error, or Discharge Error to
switch off
C
BUS
= 120 µF
Turn-Off Time
t
OFF_PSW_ERR1
—
100
—
ns
TSD or Back-drive Error to
switch off
C
BUS
= 120 µF
V
BUS
Output Rise Time
t
R_BUS
—
1.1
—
ms
Measured from 10% to 90% of
V
BUS
, C
LOAD
= 220 µF
I
LIM
= 1.0A
Soft Turn-On Rate
I
BUS
/
t
—
100
—
mA/µs
Temperature Update Time
t
DC_TEMP
—
200
—
ms
TABLE 1-2:
ELECTRICAL SPECIFICATIONS (CONTINUED)
Electrical Characteristics: Unless otherwise specified, V
DD
= 4.5V to 5.5V, V
S
= 2.9V to 5.5V,
V
PULLUP
= 3V to 5.5V, T
A
= -40°C to 105°C. All typical values at V
DD
= V
S
= 5V, T
A
= 27°C.
Characteristic
Symbol
Min.
Typ.
Max.
Unit
Conditions
Note 1:
This parameter is characterized, not 100% tested.
2:
This parameter is ensured by design and not 100% tested.
3:
The current measurement full scale range maximum value is 3.4A. However, the UCS2112 cannot report
values above I
LIM
(if I
BUS_R2MIN
I
LIM
) or above I
BUS_R2MIN
(if I
BUS_R2MIN
> I
LIM
and I
LIM
1.6A).
2015 - 2017 Microchip Technology Inc.
DS20005424C-page 7
UCS2112
Short-Circuit Response Time
t
SHORT_LIM
—
1.5
—
µs
Time from detection of short to
current limit applied.
No C
BUS
applied
Short-Circuit Detection Time
t
SHORT
—
6
—
ms
Time from detection of short to
port power switch disconnect
and ALERT# pin assertion.
Latched Mode Cycle Time
t
UL
—
7
—
ms
From PWR_EN edge transition
from inactive to active to begin
error recovery
Auto-Recovery Mode Cycle
Time
t
CYCLE
—
25
—
ms
Time delay before error
condition check
Programmable 15-50 ms,
default listed
Auto-Recovery Delay
t
TST
—
20
—
ms
Portable device attached, V
BUS
must be > V
TEST
after this time
Programmable 10-25 ms,
default listed
Discharge Time
t
DISCHARGE
—
200
—
ms
Amount of time discharge
resistor applied
Programmable 100-400 ms,
default listed
Port Power Switch Operation With Trip Mode Current Limiting
Region 2 Current
Keep-out
I
BUS_R2MIN_1
—
—
0.1
A
Note 2
Minimum V
BUS
Allowed at Output
V
BUS_MIN_1
2.0
—
—
V
Note 2
Port Power Switch Operation With Constant Current Limiting (Variable Slope)
Region 2 Current
Keep-out
I
BUS_R2MIN
—
—
2.13
A
Note 2
Minimum V
BUS
Allowed at Output
V
BUS_MIN
2.0
—
—
V
Note 2
Current Measurement – DC
Current Measurement Range
I
BUS_M
0
—
3400
mA
Range (
Note 2
and
Note 3
)
Reported Current
Measurement Resolution
I
BUS_M
—
13.3
—
mA
1 LSB
Current Measurement
Accuracy
—
±2
—
%
200 mA < I
BUS
< I
LIM
—
±2
—
LSB
I
BUS
< 200 mA
TABLE 1-2:
ELECTRICAL SPECIFICATIONS (CONTINUED)
Electrical Characteristics: Unless otherwise specified, V
DD
= 4.5V to 5.5V, V
S
= 2.9V to 5.5V,
V
PULLUP
= 3V to 5.5V, T
A
= -40°C to 105°C. All typical values at V
DD
= V
S
= 5V, T
A
= 27°C.
Characteristic
Symbol
Min.
Typ.
Max.
Unit
Conditions
Note 1:
This parameter is characterized, not 100% tested.
2:
This parameter is ensured by design and not 100% tested.
3:
The current measurement full scale range maximum value is 3.4A. However, the UCS2112 cannot report
values above I
LIM
(if I
BUS_R2MIN
I
LIM
) or above I
BUS_R2MIN
(if I
BUS_R2MIN
> I
LIM
and I
LIM
1.6A).
UCS2112
DS20005424C-page 8
2015 - 2017 Microchip Technology Inc.
Current Measurement – AC
Sampling Rate
—
—
1.1
—
ms
Note 2
Conversion Time
both channels
t
CONV
—
2.2
—
ms
All registers updated in digital
(
Note 2
)
Charge Rationing – DC
Accumulated Current
Measurement Accuracy
—
—
±4.5
—
%
Charge Rationing – AC
Current Measurement
Update Time
t
PCYCLE
—
1
—
s
Attach / Removal Detection
V
BUS
Bypass – DC
On Resistance
R
ON_BYP
—
45
—
Ω
Leakage Current
I
LEAK_BYP
—
—
3
µA
Switch off T
A
< +85°C (
Note 1
)
Current Limit
I
DET_CHG
/
I
BUS_BYP
—
500
—
µA
V
DD
= 5V and V
BUS
> 4.75V
V
BUS
Charge Time for
Attachment
t
DET_CHARGE
—
800
—
ms
C
BUS
= 500 µF maximum
Attach/Removal Detection – DC
Attach Detection
Threshold
I
DET_QUAL
—
800
—
µA
Programmable 200-1000 µA,
default listed
Primary Removal
Detection Threshold
I
REM_QUAL_ACT
—
700
—
µA
Programmable 100-900 µA,
default listed. Active power state
I
REM_QUAL_DET
—
800
—
µA
Programmable, default listed.
Detect power state
Attach/Removal Detection – AC
Attach Detection Time
t
DET_QUAL
—
100
—
ms
Time from Attach to A_DET#
assert.
Removal Detection Time
t
REM_QUAL
—
1000
—
ms
TABLE 1-2:
ELECTRICAL SPECIFICATIONS (CONTINUED)
Electrical Characteristics: Unless otherwise specified, V
DD
= 4.5V to 5.5V, V
S
= 2.9V to 5.5V,
V
PULLUP
= 3V to 5.5V, T
A
= -40°C to 105°C. All typical values at V
DD
= V
S
= 5V, T
A
= 27°C.
Characteristic
Symbol
Min.
Typ.
Max.
Unit
Conditions
Note 1:
This parameter is characterized, not 100% tested.
2:
This parameter is ensured by design and not 100% tested.
3:
The current measurement full scale range maximum value is 3.4A. However, the UCS2112 cannot report
values above I
LIM
(if I
BUS_R2MIN
I
LIM
) or above I
BUS_R2MIN
(if I
BUS_R2MIN
> I
LIM
and I
LIM
1.6A).
2015 - 2017 Microchip Technology Inc.
DS20005424C-page 9
UCS2112
FIGURE 1-1:
SMBus Timing.
1.1
ESD and Transient Performance
1.1.1
HUMAN BODY MODEL (HBM)
PERFORMANCE
HBM testing verifies the ability to withstand ESD strikes
like those that occur during handling and manufactur-
ing and is done without power applied to the IC. To pass
the test, the device must have no change in operation
or performance due to the event.
1.1.2
CHARGED DEVICE MODEL (CDM)
PERFORMANCE
CDM testing verifies the ability to withstand ESD strikes
like those that occur during handling and assembly with
pick and place style machinery and is done without
power applied to the IC. To pass the test, the device
must have no change in operation or performance due
to the event.
TABLE 1-3:
TEMPERATURE SPECIFICATIONS
Parameters
Sym.
Min.
Typ.
Max.
Units
Conditions
Temperature Ranges
Operating Temperature Range
T
A
-40
—
+105
°C
Operating Junction Temperature
T
J
-40
—
+125
°C
Storage Temperature Range
T
A
-55
—
+150
°C
Thermal Package Resistances – see
Table 1-1
.
SMDATA
SMCLK
T
BUF
P
S
S - Start Condition
P - Stop Condition
P
S
T
HIGH
T
LOW
T
HD:STA
T
SU:STO
T
HD:STA
T
HD:DAT
T
SU:DAT
T
SU:STA
T
FALL
T
RISE
TABLE 1-4:
ESD RATINGS
ESD Specification
Rating or Value
Human Body Model (JEDEC JESD22-A114) – All pins
8 kV
Charged Device Model (JEDEC JESD22-C101) – All pins
500V
UCS2112
DS20005424C-page 10
2015 - 2017 Microchip Technology Inc.
NOTES: