3. Exceeding the absolute maximum ratings may damage the device.
4. The device is not guaranteed to function outside its operating ratings.
5. INA and INB can be taken to 0V; however the minimum operating voltage is 2.8V.
6. The maximum allowable power dissipation of any T
A
(ambient temperature) is P
D(MAX)
= (T
J(MAX)
– TA) / θ
JA
. Exceeding the maximum allowable power
dissipation will result in excessive die temperature, and the MIC1344 will go into thermal shutdown.
7. Devices are ESD sensitive. Handling precautions recommended. Human Body Model (HBM) is 1.5kΩ in series with 100pF. Machine Model (MM), is
200pF, per JESD 22-A115.
Condition
Both inputs disabled, I
OUT
= 0A. Per channel.
One of the inputs enabled, I
OUT
= 0A.
Min.
Typ.
11
300
Max.
15
350
2.5
Units
µA
V
V
2.2
2.35
0.1
I
OUT
= 500mA.
V
INA
or V
INB
= 2.8V, I
OUT
= 500mA
Leakage current of OUT to INA or INB when the
corresponding input channel is turned off.
Leakage current of INA to INB, or INB to INA.
70
120
1
1
300
200
220
10
10
mΩ
mΩ
µA
µA
mV
R
ILIMA
, R
ILIMB
= 931Ω
R
ILIMA
, R
ILIMB
= 10kΩ
R
ILIMA
, R
ILIMB
= 931Ω
R
ILIMA
, R
ILIMB
= 10kΩ
V
OUT
= 2.6V to V
INA
= 2.5V (with INA selected) or
V
OUT
= 2.6V to V
INB
= 2.5V (with INB selected)
V
OUT
falling
2.58
0.25
2.40
0.20
2.85
0.28
2.7
0.25
100
50
3.15
0.31
3.00
0.30
A
A
mV
mV
April 24, 2015
4
Revision 1.0
Micrel, Inc.
MIC1344
Electrical Characteristics (Continued)
V
INA
or V
INB
= 5V; I
OUT
= 100mA; C
INA
= C
INB
= 1µF, C
OUT
= 10µF, T
J
= +25°C,
bold
values indicate junction temperature
–40°C to +125°C, unless noted.
Parameter
ILIMA or ILIMB Current-Limit
(8)
Onset Threshold Voltage
V
ILIMA
or V
ILIMB
for Low-Current
INA or INB High-Load Shutdown
(9)
Response Time
Automatic Mode Switchover
(10)
Delay Time
INA-to-INB Manual Mode
(11)
Switchover Delay Time
INB-to-INA Manual Mode
(11)
Switchover Delay Time
Switch Off Delay Time
Initial Power-Up Delay
(12)
Condition
R
ILIMA
, R
ILIMB
= 10kΩ
V
INA
or V
INB
= 3.5V, I
OUT
= 20mA
I
OUT
= 0mA to R
OUT
= 0.1Ω
(turn off transition time, no load to high-current load)
Automatic mode, V
INA
+ 300mV
≥
V
INB
or
V
INB
+ 300mV
≥
V
INA
Time from INB selected to V
OUT
= 90% of V
INB
voltage
V
INA
= 0V, V
INB
= 5V
Time from INA selected to V
OUT
= 90% of V
INA
voltage
V
INA
= 5V, V
INB
= 0V
Automatic mode, INA or INB selected to No Input
Selected. R
OUT
= 10Ω. No C
OUT
Automatic mode, INA or INB selected. R
OUT
= 10Ω,
V
INA
or V
INB
transitions from 0V to 5V
Min.
1.10
15
Typ.
1.20
100
1.5
5
350
350
0.5
0.3
570
Max.
1.30
185
Units
V
mV
µs
10
700
700
µs
µs
µs
µs
(13)
1
ms
kΩ
ENA or ENB Input Resistance
5V ENA or ENB Logic Level Low
Voltage
3V ENA or ENB Logic Level Low
Voltage
5V ENA or ENB Threshold Hysteresis
STAOK or STBOK Active, Output
Voltage
STAOK or STBOK Inactive,
Leakage Current
ASEL\ or BSEL\ Active, Output Voltage
ASEL\ or BSEL\ Inactive, Leakage
Current
Overtemperature Shutdown
Temperature Threshold
Overtemperature Shutdown Hysteresis
Notes:
Voltage falling. V
INA
or V
INB
= 5V.
Voltage falling. V
INA
or V
INB
= 3V.
V
INA
or V
INB
= 5V.
I
STAOK
or I
STBOK
= 10mA
V
STAOK
or V
STBOK
= 5V (leakage current to GND)
I
ASEL\
or I
BSEL\
= 10mA
V
ASEL\
or V
BSEL\
= 5V (leakage current to GND)
Junction temperature increasing
1.20
0.8
300
0.15
1
0.15
1
150
20
1.05
0.60
V
V
mV
0.3
V
µA
0.3
V
µA
°C
°C
8. The current-limit threshold onset voltage is the voltage on ILIM (A or B) that corresponds to the onset of the output current regulation for the
corresponding input channel.
9. The time it takes for the output current on either INA or INB to go from 0mA (no load) to 20% over the steady state maximum current-limit value,
when a load of 0.1Ω is applied between the OUT pin and GND.
10. This is the time that the MIC1344 takes to switch between one of the two input voltages when it is in automatic mode. This is the time from when one
of the input voltages goes above the other by 300mV, to the time when the output voltage reaches 90% of its final value.
11. This is the time it takes to switch from one input (INA or INB) to the other (INB or INA), when in manual mode. This is the time from the ENx
transition, to when the output voltage reaches 90% of its final value. (x can be either A, or B).
12. This is the time from the ENA = 0, ENB = 1 transition, to when the output voltage reaches 10% of its initial value.
13. This is the time between when the MIC1344 is powered up (10% of the V
INA
or V
INB
voltage ramp-up), to the time when the OUT voltage stabilizes to
