MAX1607 Maxim, MAX1607 Datasheet - Page 6

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

The MAX1607 P-channel MOSFET power switch limits
output current to 0.7A min and 1.0A max. When the out-
put current is increased beyond the current limit (I
the current also increases through the replica switch
(I
the voltage to the internal 1.24V reference and regu-
lates the current back to the I
USB Current-Limited Switch
in Pin-Compatible Package
Figure 1. Functional Diagram
6
6, 7, 8
OUT
OC
2, 3
EN
SO
IN
—
1
4
5
_______________________________________________________________________________________
PIN
/ 6500). The current-limit error amplifier compares
N
1, 3, 9
TDFN
8, 10
2, 4,
—
6
5
7
NAME
GND
OUT
OC
EN
EP
CIRCUITRY
IN
CONTROL
P
P
10ms
TIMER
Detailed Description
REPLICA
AMPLIFIER
HOT
Ground
Input. P-channel MOSFET source. Connect all IN pins together and bypass with a 1µF capacitor to
ground.
Active-Low Switch Enable Input. A logic-low turns on the switch.
Overcurrent Indicator Output. This open-drain output goes low when the device is in thermal
shutdown or undervoltage lockout, or during a sustained (> 10ms) current-limit condition.
Switch Output. P-channel MOSFET drain. Connect all OUT pins together and bypass with a 0.1µF
capacitor to ground.
Exposed Paddle (TDFN Package Only). Internally connected to GND. Connect to a large ground
plane to maximize thermal performance. Not intended as an electrical connection point.
ON
LIMIT
ON
CURRENT-LIMIT
AMPLIFIER
(Figure 1).
1.24V
MAX1607
P
LIMIT
GND
OUT
),
These switches are not bidirectional; therefore, the
input voltage must be higher than the output voltage.
The MAX1607 is a short-circuit-protected switch. In the
event of an output short-circuit condition, the current
through the switch is foldback-current-limited to 500mA
continuous.
The MAX1607 has a thermal shutdown feature. The
switch turns off and the OC output goes low immediate-
ly (no overcurrent blanking) when the junction tempera-
ture exceeds +165°C. When the MAX1607 cools 20°C,
the switch turns back on. If the fault short-circuit condi-
tion is not removed, the switch will cycle on and off,
resulting in a pulsed output.
The MAX1607 provides an overcurrent output (OC). A
100kΩ pull-up resistor from OC to IN provides a logic
control signal. This open-drain output goes low when
any of the following conditions occur:
• The input voltage is below the 2.4V undervoltage-
• The die temperature exceeds the thermal shutdown
• The device is in current limit for greater than 10ms.
The MAX1607 features 10ms overcurrent blanking.
Blanking allows brief current-limit faults, including
momentary short-circuit faults that occur when hot-
swapping a capacitive load, and also ensures that no
OC is issued during power-up. When a load transient
causes the device to enter current limit, an internal
lockout (UVLO) threshold.
temperature limit of +165°C.
FUNCTION
Continuous Short-Circuit Protection
Pin Description
Thermal Shutdown
OC Indicator
OC Blanking