MAX1607 Maxim, MAX1607 Datasheet - Page 7

• Manufacturer Part Number: MAX1607
• Description: The MAX1607 is a current-limited 60mΩ switch with built-in fault blanking
• Manufacturer: Maxim

counter starts. If the load fault persists beyond the
10ms overcurrent-blanking timeout, the OC output
asserts low. Ensure that the MAX1607 input is ade-
quately bypassed to prevent input glitches from trigger-
ing spurious OC outputs. Input voltage glitches less
than 150mV will not cause a spurious OC output. Load-
transient faults less than 10ms (typ) will not cause an
OC output assertion.
Only current-limit faults are blanked. Die overtempera-
ture faults and input voltage droops below the UVLO
threshold will cause an immediate OC output.
To limit the input voltage drop during momentary output
short-circuit conditions, connect a capacitor from IN to
GND. A 1µF ceramic capacitor will be adequate for
most applications; however, higher capacitor values will
further reduce the voltage drop at the input (Figure 2).
Connect a 0.1µF capacitor from OUT to GND. This
capacitor helps to prevent inductive parasitics from
pulling OUT negative during turn-off.
Figure 2. Typical Application Circuit
OVERCURRENT
* USB SPECIFICATIONS REQUIRE
INPUT
1μF
A HIGHER VALUE CAPACITOR.
OUTPUT
ON
OFF
100k
Applications Information
_______________________________________________________________________________________
IN
OC
EN
MAX1607
GND
Output Capacitor
Input Capacitor
OUT
0.1μF *
USB Current-Limited Switch
OUTPUT
in Pin-Compatible Package
Important: Optimize the switch response time to output
short-circuit conditions by keeping all traces as short
as possible to reduce the effect of undesirable parasitic
inductance. Place input and output capacitors as close
as possible to the device (no more than 5mm away). All
IN and OUT pins must be connected with short traces
to the power bus. Wide power-bus planes will provide
superior heat dissipation through the MAX1607’s IN
and OUT pins.
Under normal operating conditions, the package can
dissipate and channel heat away. Calculate the maxi-
mum power dissipation as follows:
where I
R
When the output is short circuited, foldback-current lim-
iting activates and the voltage drop across the switch
equals the input supply. The power dissipated across
the switch increases, as does the die temperature. If
the fault condition is not removed, the thermal-over-
load-protection circuitry activates (see Thermal
Shutdown section). Wide power-bus planes connected
to IN and OUT and a ground plane in contact with the
device will help dissipate additional heat.
TRANSISTOR COUNT: 715
ON
is the on-resistance of the switch (125mΩ max).
Pin Configurations (continued)
LIMIT
TOP VIEW
*EP = EXPOSED PADDLE
is the preset current limit (1.0A max) and
Layout and Thermal Dissipation
P = (I
+
10
1
LIMIT
EP*
9
2
MAX1607
3
8
)
Chip Information
2
✕
4
7
R
5
ON
6
7