November 29, 2001 1 MIC2010/2070
MIC2010/2070 Micrel
MIC2010/MIC2070
USB Power Controller
Final Information
General Description
The MIC2010 is a dual channel USB power switch designed
to support the power distribution requirements for USB
Wakeup from the ACPI S3 state. The MIC2010 will directly
switch its two outputs between a 5V main supply and a 5V
auxiliary supply normally provided in ATX style power sup-
plies.
The MIC2010 will adjust its current-limit threshold according
to the ACPI state it is in. In the normal active ACPI S0 state
the current-limit is set at 500mA minimum per channel
satisfying the USB continuous output current specification. In
the S3 state the current-limit can be reduced to a value
determined by an external resistor to minimize the current
that is supplied by the auxiliary supply, thereby ensuring that
voltage regulation is maintained even during fault conditions.
The MIC2010 provides make-before-break switching to en-
sure glitch-free transitions between the S3 and S0 states.
Each channel is also thermally isolated from the other so that
a fault in one channel does not effect the other. FAULT status
output signals are also provided indicating overcurrent and
thermal shutdown conditions.
The MIC2070 option latches the output off upon detecting an
overcurrent condition lasting for more than 5ms minimum.
The output can be reset by either toggling the EN inputs of the
MIC2070-1/-2 or by removing the load. Latching the output
off provides a circuit breaker mode of operation which re-
duces power consumption during fault conditions.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
Features
• Compliant to USB power distribution specifications
• Two completely independent switches
• Integrated switching matrix supports ACPI S0/S3 state
transitions without external FET circuits
• Make-before-break switching ensures glitch-free
transitions
• No back-feed of auxiliary supply onto main supply
during standby mode
• Bi-level current-limit preserves auxiliary supply voltage
regulation in standby mode
• Thermally isolated channels
• Thermal shutdown protection
• Fault status outputs with filter prevents false assertions
during hot-plug events
• Circuit breaker options with auto-reset (MIC2070)
• Undervoltage lockout
Applications
• Desktop PCs
• Notebook PCs
• Notebook docking stations
• LAN Servers
• PC motherboard
T ypical Application
MIC2010-1P/-2P
VBUS
D+
D–
GND
MAIN
AUX OUT1
EN1
EN2
Downstream
USB
Port 1
100µF
5V MAIN
ATX Power Supply
S3#
FAULT1
FAULT1
VBUS
D+
D–
GND
Downstream
USB
Port 2
OUT2
RSET1
RSET2
GND
5V STANDBY
82801AA or Equivalent
SLP S3#
SLP S5#
OC0
OC1
Overcurrent Port 1
Overcurrent Port 1
ON/OFF 1
ON/OFF 2
100µF
S3# CONTROL
Figure 1. USB Wakeup From ACPI S3 System Diagram
UL Recognized Component
MIC2010/2070 Micrel
MIC2010/2070 2 November 29, 2001
Pin Configuration
1FAULT1
EN1
S3#
RSET1
AUX
NC
RSET2
GND
16 FAULT2
EN2
OUT1
OUT1
MAIN
MAIN
OUT2
OUT2
15
14
13
12
11
10
9
2
3
4
5
6
7
8
16-Pin QSOP (QS)
Ordering Information
Fault Circuit Breaker Temperature
Part Number Enable Output Function Range Package
MIC2010-1CQS* Active High Open-Drain 0°C to +70°C 16-lead QSOP
MIC2010-1PCQS* Active High Internal Pull-Up 0°C to +70°C 16-lead QSOP
MIC2010-2CQS* Active Low Open-Drain 0°C to +70°C 16-lead QSOP
MIC2010-2PCQS Active Low Internal Pull-Up 0°C to +70°C 16-lead QSOP
MIC2070-1CQS Active High Open-Drain ✓0°C to +70°C 16-lead QSOP
MIC2070-1PCQS* Active High Internal Pull-Up ✓0°C to +70°C 16-lead QSOP
MIC2070-2CQS* Active Low Open-Drain ✓0°C to +70°C 16-lead QSOP
MIC2070-2PCQS* Active Low Internal Pull-Up ✓0°C to +70°C 16-lead QSOP
* Contact factory for availability.
November 29, 2001 3 MIC2010/2070
MIC2010/2070 Micrel
Pin Description
Pin Number Pin Name Pin Function
1 FAULT1 Fault Status (Output): Channel 1, active-low; weak pull-up to AUX or open-
drain. FAULT1 is asserted LOW when channel 1 is in a thermal shutdown
state or overcurrent condition for more than 5ms. MIC2070 latches this
output in its asserted state upon overcurrent condition. Toggling EN1 or
removing the load will reset the circuit breaker latch, and deassert FAULT1.
2 EN1 Enable (Input): Channel 1, active-high (–1) or active-low (–2). Toggling this
input also resets the latched output of the MIC2070.
3 S3# Control (Input): When this input is high, the MAIN inputs are connected to
OUT1 and OUT2 via 100mΩ, 500mA MOSFET switches. When this input is
LOW, the AUX inputs are connected to OUT1 and OUT2 via 500mΩ
MOSFET switches with a current-limit threshold specified by external
resistors, RSET1 and RSET2.
4 RSET1 Current-Limt Set Resistor (Input): Channel 1. A resistor connected to this
input sets the current-limit threshold in AUX mode (S3# asserted). The
current-limit threshold is determined by approximately 18/RSET1.
5 AUX Auxiliary 5V Supply (Input): Also used as power supply for internal circuitry.
6 NC No Connection: This pin may be connected to other pins without restriction.
7 RSET2 Current-Limit Set Resistor (Input): Channel 2. A resistor connected to this
input sets the current-limit threshold in AUX mode (S3# asserted). The
current-limit threshold is determined by approximately 18/RSET2.
8 GND Ground
9, 10 OUT2 Channel 2 (Output): Both pins must be connected together externally.
11, 12 MAIN 5V Main Supply (Input): All MAIN inputs must be connected together
externally.
13, 14 OUT1 Channel 1 (Output): Both pins must be connected together externally.
15 EN2 Enable (Input): Channel 2, active-high (–1) or active-low (–2). Toggling this
input also resets the latched output for the MIC2070.
16 FAULT2 Fault Status (Output): Channel 2, active-low; weak pull-up to AUX or open-
drain. FAULT2 is asserted LOW when channel 2 is in a thermal shutdown
state or overcurrent condition for more than 5ms. MIC2070 latches this
output in it's asserted state upon overcurrent condition. Toggling EN2 or
removing load will reset the circuit breaker latch, and deassert FAULT2.
MIC2010/2070 Micrel
MIC2010/2070 4 November 29, 2001
Absolute Maximum Ratings (Note 1, Note 4)
Supply Voltage (VIN) ........................................ –0.3V to 6V
FAULT#, OUT1, OUT2 Output Pins................. –0.3V to 6V
FAULT1,FAULT2, Output Current..............................25mA
ESD Rating, Note 3 ...................................................... 2kV
Operating Ratings (Note 2)
Supply Voltage (VMAIN, VAUX) ..................... +4.5V to +5.5V
Continuous Output Current (AUX Mode) .. 50mA to 300mA
Ambient Temperature (TA)........................... –0°C to +70°C
Junction Temperature (TJ) .......................Internally Limited
Package Thermal Resistance
QSOP(θJA) ........................................................163°C/W
Electrical Characteristics
VMAIN = 5V; AUX = 5V; RSET = 125Ω, TA = 25°C.
Symbol Parameter Condition Min Typ Max Units
VMAIN MAIN Supply Voltage 4.5 5.0 5.5 V
IMAIN MAIN Supply Current S3# = 1, both switches ON, no load 16 22 µA
Note 5 S3# = 1, both switches OFF, no load 5 µA
ILEAK MAIN Reverse Leakage Current, S3# = 0, both switches ON, VMAIN = 0V –10 +10 µA
Note 5
VAUX AUX Supply Voltage 4.5 5.0 5.5 V
IAUX AUX Supply Current, Note 5 S3# = 0; No load, both switches ON .6 1 mA
S3# = 0; No load, both switches OFF 5 µA
VUV/AUX AUX Undervoltage Lockout VAUX increasing 3.5 3.7 4.0 V
Threshold VAUX decreasing 3.3 3.5 3.8 V
VHYS AUX Undervoltage Lockout 200 mV
Hysteresis
RDSMAIN MAIN On-Resistance, Each Output S3# = 1, IOUT = 500mA 100 140 mΩ
RDSAUX AUX On-Resistance, Each Output S3# = 0, IOUT = 100mA 500 700 mΩ
ILIMIT MAIN Current-Limit Threshold, S3# = 1, VOUT = 4.0V, ramped load 0.5 1.25 A
MAIN Short-Circuit Current-Limit VOUT = 0V 0.5 1.25 A
Current-Limit Factor (AUX Supply), S3# = 0, IOUT = 50mA to 300mA 14.4 18 21.6 A •Ω
Note 6 VOUT = 4V
VTH S3#, EN1, EN2 High-to-Low transition .8 1.5 V
Input Threshold Voltage Low-to-High transition 1.7 2.0 V
IIN S3#, EN1, EN2 Input Current VS3/EN =5V, 0V –11µA
VHYS EN1, EN2 and S3# Input Hysteresis 200 mV
IOFF OUT1, 2 Leakage Current Outputs are off, VOUT = 0 –10 10 µA
Pull-Up Current During Latched Outputs latched off TBD 1 TBD mA
Output State (MIC2070-x only)
VTH LATCH Latch Reset Threshold VOUT rising 1.95 V
Minimum Output Slew Rate Output rising .4 V/s
to Reset Latch (MIC2070-x only),
Note 7
Overtemperature Threshold TJ increasing, single channel 140 °C
TJ decreasing, single channel 120 °C
TJ increasing, both channels 160 °C
TJ decreasing, both channels 125 °C
VOL FAULT1, 2 Output Low Voltage IFAULT = 5mA 0.2 V
FAULT1, 2 Output Off Current VFAULT = 5V 0.2 10 µA
(Not Applicable for 'P' versions)
November 29, 2001 5 MIC2010/2070
MIC2010/2070 Micrel
Symbol Parameter Condition Min Typ Max Units
VOH FAULT1, 2 Output High Voltage IFAULT = –20µA4V
(MIC2010-1P, 2P), (MIC2070-1P, 2P)
THMAIN to S3# Hold Time, Note 7 Figure 5 5 ms
TSMAIN to S3# Set-up Time, Note 7 Figure 5 0 ms
tDLY FAULT Delay Filter Response Time Output shorted to ground, Figure 4 5 10 20 ms
(Overcurrent only), Note 8
tOC Overcurrent Response Time Output shorted to ground, Figure 4
MAIN output 2 µs
AUX output 2 µs
tON(MAIN) MAIN Output Turn-On Time RL = 10Ω, CL = 1µF, Figure 3 2 ms
tOFF(MAIN) MAIN Output Turn-Off Time RL = 10Ω, CL = 1µF, Figure 3 35 µs
tr(MAIN) MAIN Output Rise Time RL = 10Ω, CL = 1µF, Figure 3 2 ms
tf(MAIN) MAIN Output Fall Time RL = 10Ω, CL = 1µF, Figure 3 32 µs
tON(AUX) AUX Output Turn-On Time RL = 50Ω, CL = 1µF, Figure 3 0.6 ms
tOFF(AUX) AUX Output Turn-Off Time RL = 50Ω, CL = 1µF, Figure 3 120 µs
tr(AUX) AUX Output Rise Time RL = 50Ω, CL = 1µF, Figure 3 0.5 ms
tf(AUX) AUX Output Fall Time RL = 50Ω, CL = 1µF, Figure 3 115 µs
tXMA MAIN to AUX S3# transition to 0 5 7.5 ms
Cross Conduction Time, Note 9
tXAM AUX to MAIN S3# transition to 1 5 7.5 ms
Cross Conduction Time, Note 9
Note 1. Exceeding the absolute maximum rating may damage the device.
Note 2. The device is not guaranteed to function outside its operating rating.
Note 3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
Note 4. All voltages are referenced to ground.
Note 5. For MIC2070-1(P) OFF occurs when VEN < 0.8V and ON occurs when VEN > 2.4V. For MIC2070-2(P) OFF occurs when VEN > 2.4V and ON
occurs when VEN < 0.8V.
Note 6. Current-limit threshold is defined by the current-limit factor divided by RSET.
Note 7. Guaranteed by design. Not production tested.
Note 8. Assumes only one channel in current-limit. Delay circuitry is shared among channels so it is possible for tDLY to be 40ms max if one channel
enters current-limit as the other is about to time-out.
Note 9. Cross conduction time is the duration in which both MAIN and AUX internal switches are on subsequent to S3# transitioning.
Test Circuit
Device
Under
Test CL
OUT
RL
VOUT
IOUT
Timing Diagram
90%
VOUT 10%
90%
10%
trtf
MIC2010/2070 Micrel
MIC2010/2070 6 November 29, 2001
VEN 50%
90%
VOUT 10%
tOFF
tON
Figure 2. MIC2010/70-1
VEN 50%
90%
VOUT 10%
tOFF
tON
Figure 3. MIC2010/70-2
Output shorted to ground
VOUT
FAULT#
ILIMIT
tOC tDLY
IOUT
Figure 4. Overcurrent Response Timing
MAIN
t
H
S3# 1.5V
t
S
1.5V
Figure 5. MAIN to S3# Timing
November 29, 2001 7 MIC2010/2070
MIC2010/2070 Micrel
Functional Description
The MIC2010/2070 are designed to support the power distri-
bution requirements for USB wakeup from the ACPI S3 state.
It integrates two independent channels under control of input
S3#. When S3# is asserted LOW (ACPI S3 state) the MIC2010/
2070 will switch a 500mΩ MOSFET switch from the AUX
input to each of its two outputs. In addition the current-limit
threshold will be set to a value specified by a resistor
connected to the RSET inputs. Conversely when the S3#
input is HIGH the MIC2010/2070 will switch a 100mΩ MOSFET
switch from the MAIN inputs to each of its two outputs. The
current-limit threshold is preset to 500mA in this state. The
lower current limit during the ACPI S3 state helps to ensure
that the standby supply maintains regulation even during fault
conditions.
Thermal Shutdown
Thermal shutdown is employed to protect the device from
damage should the die temperature exceed safe margins
due mainly to short circuit faults. Thermal shutdown shuts off
the output MOSFET and asserts the FAULT output if the die
temperature reaches 140°C and the overheated channel is in
current limit. The other channel is not affected. If however, the
die temperature exceeds 160°C, both channels will be shut
off even if neither channel is in current limit.
Power Dissipation
The device’s junction temperature depends on several fac-
tors such as the load, PCB layout, ambient temperature and
package type. The power dissipated in each channel is
PD = RDS(on) × IOUT2 where RDS(on) is the on-resistance of the
internal MOSFETs and IOUT is the continuous output current.
Total power dissipation of the device will be the summation of
PD for both channels. To relate this to junction temperature,
the following equation can be used:
Functional Diagram
Current
Limit
10ms
Timer
Charge Pump
+
Gate Control
S3#
EN
Current
Limit
MAIN
OUT
AUX
RSET
/FAULT
AUX
Latch
To Other Channel
*
MAIN
FET
AUX
FET
*MIC2070-1/2 Only
Thermal
Sense
* 'P' options only
TJ = PD × θJA + TA
where:
TJ = junction temperature
TA = ambient temperature
θJA = is the thermal resistance of the package
Current Sensing and Limiting
The current-limit threshold of each channel is preset inter-
nally at 500mA when S3# is deasserted. When S3# is
asserted the current-limit threshold is specified by a resistor
connected to the RSET input. The value of the current-limit
threshold is determined by the equation 18/RSET ohms where
RSET is the resistance connected between the RSET pin and
ground. The current-limit threshold should be set at 1.2X of
the applications continous output current requirement.
When an overcurrent condition lasts longer than tDLY the
MIC2070 will activate an internal circuit breaker that will latch
the output off and assert FAULT. The output will remain off
until either the load is removed or EN is toggled. When the
MIC2070 enters a latched output condition a 1mA pull-up
current source is activated. This provides a way to automati-
cally reset the output once the load is removed without the
need to toggle the enable input. Please refer to Figure 7 for
timing details.
The MIC2010 will automatically reset its output when the die
temperature cools down to 120°C. The MIC2010 output and
FAULT signal will continue to cycle on and off until the device
is disabled or the fault is removed. Figure 6 depicts typical
timing. Depending on PCB layout, package, ambient tem-
perature, etc., it may take several hundred milliseconds from
the incidence of the fault to the output MOSFET being shut
MIC2010/2070 Micrel
MIC2010/2070 8 November 29, 2001
off. This time duration will be shortest in the case of a dead
short on the output.
Fault Status Output
The FAULT signal is an active-low output with a weak pull-
up or open-drain configuration. FAULT is asserted when
either an overcurrent or thermal shutdown condition occurs.
In the case of an overcurrent condition, FAULT will be
asserted only after the flag response delay time, tDLY , has
elapsed. This ensures that FAULT is asserted only upon valid
overcurrent conditions and that erroneous error reporting is
eliminated. The FAULT response delay time tDLY is typically
10ms. Since the delay timer is shared between both channels
it is possible for tDLY to be extended by an amount equal to the
difference between the occurrence of the over-current event
in both channels.
Undervoltage Lockout
Undervoltage lockout (UVLO) prevents the output MOSFET
from turning on until the AUX input exceeds approximately
3.5V. UVLO ensures that the output MOSFETs remain off to
prevent high transient inrush current due to stray or bulk load
capacitance. This helps to ensure that the power supply
voltage regulation is preserved and also prevents possible
damage to sensitive components.
EN
(MIC2010-2)
V
OUT
Overcurrent Fault
Thermal Shutdown
Reached
FAULT
Figure 6. MIC2010 System Timing
EN
(MIC2070-2)
V
OUT
Overcurrent Fault
Load Removed–
Output Reset
FAULT
Figure 7. MIC2070 System Timing—
Output Resets When Load is Removed
November 29, 2001 9 MIC2010/2070
MIC2010/2070 Micrel
Functional Characteristics
V
MAIN
= V
AUX
= 5V
C
L
= 100µF
R
L
= 10Ω
AUX Start-up by UVLO
TIME (500µs/div)
V
AUX
(2V/div)
FAULT
(2V/div)
V
OUT
(2V/div)
IOUT
(50mA/div)
V
AUX
ramps from 0V to 5V
V
MAIN
= S3# = 0V
EN = [ON]
R
LOAD
= 50Ω
C
LOAD
= 1µF
V
MAIN
= V
AUX
= 5V
C
L
= 100µF
R
L
= 10Ω
AUX Shutdown by UVLO
TIME (10ms/div)
2.96V
V
AUX
ramps from 5V to 0V
V
MAIN
= S3# = 0V
EN = [ON]
R
LOAD
= 50Ω
C
LOAD
= 1µF
V
AUX
(2V/div)
FAULT
(2V/div)
V
OUT
(2V/div)
I
OUT
(50mA/div)
Main Start-up by UVLO
TIME (500µs/div)
3.20V
VMAIN
(2V/div)
FAULT
(2V/div)
VOUT
(2V/div)
IOUT
(200mA/div)
VMAIN = VAUX;VMAIN & VAUX ramp from 0V to 5V
S3# = 5V
EN = [ON]
RLOAD = 10Ω
CLOAD = 1µF
S3# = 5V
EN = [ON]
R
LOAD
= 10‰
C
LOAD
= 1 F
V
MAIN
=
V
AUX
;V
MAIN
&
V
AUX
ramp from 5V to 0V
V
MAIN
(2V/div)
FAULT
(2V/div)
V
OUT
(2V/div)
I
OUT
(200mA/div)
Main Shut-down by UVLO
TIME (10ms/div)
2.96V
Main T urn-On Response
TIME (250µs/div)
V
MAIN
=
V
AUX
=5V
S3# = 5V
EN toggles from [OFF] to [ON]
R
LOAD
= 10Ω
C
LOAD
= 1µF
EN
(5V/div)
FAULT
(5V/div)
V
OUT
(2V/div)
I
OUT
(200mA/div)
Main T urn-Off Response
TIME (100µs/div)
V
MAIN
=
V
AUX
=5V
S3# = 5V
EN toggles from [ON] to [OFF]
R
LOAD
= 10Ω
C
LOAD
= 1µF
EN
(5V/div)
FAULT
(5V/div)
V
OUT
(5V/div)
I
OUT
(200mA/div)
MIC2010/2070 Micrel
MIC2010/2070 10 November 29, 2001
AUX Turn-On Response
TIME (100µs/div)
V
AUX
=5V
V
MAIN
=
S3# = 0V
EN toggles from [OFF] to [ON]
R
LOAD
= 50Ω
C
LOAD
= 1µF
EN
(5V/div)
FAULT
(5V/div)
V
OUT
(5V/div)
I
OUT
(50mA/div)
AUX Turn-Off Response
TIME (100µs/div)
V
AUX
=5V
V
MAIN
=
S3# = 0V
EN toggles from [ON] to [OFF]
R
LOAD
= 50Ω
C
LOAD
= 1µF
EN
(5V/div)
FAULT
(5V/div)
V
OUT
(5V/div)
I
OUT
(50mA/div)
Turn-On from S3# to AUX
TIME (100µs/div)
V
AUX
=5V, V
MAIN
= 0V
EN =
[ON]
S3# toggles from [HI] to [LOW]
R
LOAD
= 50Ω
C
LOAD
= 1µF
S3#
(5V/div)
FAULT
(5V/div)
V
OUT
(5V/div)
I
OUT
(50mA/div)
Turn-Off from AUX to S3#
TIME (1ms/div)
V
AUX
=5V, V
MAIN
=
0V
S3# toggles from [LO] to [HI]
EN = [ON]
R
LOAD
= 50Ω
C
LOAD
= 1µF
S3#
(5V/div)
FAULT
(5V/div)
V
OUT
(2V/div)
I
OUT
(50mA/div)
Main Inrush Current into C
LOAD
TIME (500µs/div)
C
L
= 560µF
C
L
= 100µF
C
L
= 10µF
V
MAIN
=
V
AUX
= 5V
S3# = 5V
EN toggles from [OFF] to [ON]
R
LOAD
= OPEN
C
LOAD
= 10µF, 100µF, 560µF
EN
(5V/div)
FAULT
(5V/div)
VOUT
(5V/div)
I
OUT
(500mA/div)
Main-Ramped to Short by MOSFET
1.4A
TIME (50ms/div)
V
MAIN
= V
AUX
=5V
S3# = 5V, EN = [ON]
C
LOAD
= 1µF
FAULT
(5V/div)
V
OUT
(2V/div)
I
OUT
(500mA/div)
R
LOAD
toggles from > 1kΩ to <0.5Ω
November 29, 2001 11 MIC2010/2070
MIC2010/2070 Micrel
AUX Ramped to Short by MOSFET
TIME (25ms/div)
V
AUX
= 5V
V
MAIN
= S3# = 0V, EN = [ON]
RL
OAD
toggles from >1kΩ to <0.5Ω
C
LOAD
= 1µF
FAULT
(5V/div)
V
OUT
(2V/div)
I
OUT
(100mA/div)
Main Turn-On into Short
TIME (2.5ms/div)
1.2A V
MAIN
= V
AUX
=5V
S3# = 5V
EN toggles from [OFF] to [ON]
R
LOAD
= Short
C
LOAD
= 1µF
EN
(5V/div)
FAULT
(5V/div)
V
OUT
(5V/div)
I
IN
(500mA/div)
AUX Turn-On into Short
TIME (2.5ms/div)
V
AUX
=5V
V
MAIN
= S3# = 0V
EN toggles from [OFF] to [ON]
C
LOAD
= 100µF
EN
(5V/div)
FAULT
(5V/div)
V
OUT
(2V/div)
I
OUT
(100mA/div)
AUX Inrush Current into Large C
LOAD
TIME (2.5ms/div)
230mA
V
AUX
=5V
V
MAIN
= S3#= 0V
EN toggles from [OFF] to [ON]
I
LOAD
< 10mA
C
LOAD
= 220µF
EN
(5V/div)
FAULT
(10V/div)
V
OUT
(5V/div)
I
IN
(50mA/div)
AUX Inrush Current into Small C
LOAD
TIME (100µs/div)
V
AUX
=5V
V
MAIN
= S3# = 0V
EN toggles from [OFF] to [ON]
I
LOAD
< 10mA
C
LOAD
= 10µF
EN
(5V/div)
FAULT
(10V/div)
V
OUT
(5V/div)
I
IN
(50mA/div)
Main-to-AUX Cross Conduction
TIME (250µs/div)
950µs
V
MAIN
= V
AUX
= 5V
S3# toggles from [HI] to [LO]
EN = [ON]
R
LOAD
= 50Ω
C
LOAD
= 1µF
S3#
(5V/div)
I
AUX
(50mA/div) V
OUT
(5V/div)
I
MAIN
(50mA/div)
MIC2010/2070 Micrel
MIC2010/2070 12 November 29, 2001
AUX-to-Main Cross Conduction
TIME (1ms/div)
3.96ms
V
MAIN
= V
AUX
=5V
S3# toggles from [LO] to [HI]
EN = [ON]
R
LOAD
= 50Ω
C
LOAD
= 1µF
S3#
(5V/div)
V
OUT
(5V/div)
I
AUX
(50mA/div)
I
MAIN
(50mA/div)
November 29, 2001 13 MIC2010/2070
MIC2010/2070 Micrel
MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA
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© 2001 Micrel Incorporated
Package Information
45°
0.2284 (5.801)
0.2240 (5.690)
SEATING
PLANE
0.009 (0.2286)
REF 0.012 (0.30)
0.008 (0.20)
0.157 (3.99)
0.150 (3.81)
0.050 (1.27)
0.016 (0.40)
0.0688 (1.748)
0.0532 (1.351)
0.196 (4.98)
0.189 (4.80)
0.025 (0.635)
BSC
PIN 1
DIMENSIONS:
INCHES (MM)
0.0098 (0.249)
0.0040 (0.102) 0.0098 (0.249)
0.0075 (0.190) 8°
0°
16-Pin QSOP (QS)
