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19-1544; Rev 0; 10/99
USB Current-Limited Switch in Pin-Compatible Package
General Description
The MAX1607 is a current-limited 60m switch with built-in fault blanking. Its accurate, preset 0.7A to 1.0A current limit makes it ideal for USB applications. Its low quiescent supply current (14A) and standby current (1A) conserve battery power in portable applications. The MAX1607 operates with inputs from +2.7V to +5.5V, making it ideal for both 3V and 5V systems. An overcurrent signal (OC) notifies the microprocessor that the internal current limit has been reached. A 10ms overcurrent-blanking feature allows momentary faults (such as those caused when hot-swapping into a capacitive load) to be ignored, thus preventing false alarms to the host system. This blanking also prevents an OC signal from being issued when the device is powering up. The MAX1607 has several safety features to ensure that the USB port is protected. Built-in thermal-overload protection limits power dissipation and junction temperature. The device also has accurate internal currentlimiting circuitry to protect the input supply against overload. The MAX1607 is a pin-compatible upgrade to Texas Instruments' TPS2014, TPS2015, and TPS2041 for USB applications. The same die is available in a space-saving 10-pin MAX package (MAX1693) and can be used for next-generation designs. The MAX1694 is similar to the MAX1693, but it has a built-in latch that turns off the power switch in case of a long-term short-circuit condition.
Features
o Pin Compatible with TPS2014, TPS2015, and TPS2041 o Accurate Current Limit (0.7A min, 1.0A max) o Guaranteed 0.75A Short-Circuit Protection o 10ms Internal OC Blanking Timeout o No Overcurrent (OC) Signal During Power-Up o 125m max High-Side MOSFET o 500mA Continuous Current o Short-Circuit and Thermal Protection with Overcurrent Logic Output o 1ms Start-Up Time o Undervoltage Lockout o 14A Quiescent Supply Current o 1A max Standby Supply Current o +2.7V to +5.5V Supply Range o UL Recognition Pending
MAX1607
Ordering Information
PART MAX1607ESA TEMP. RANGE -40C to +85C PIN-PACKAGE 8 SO
Applications
Notebook Computers USB Ports USB Hubs Docking Stations
Typical Operating Circuit Pin Configuration
INPUT +2.7V TO +5.5V IN OUT OUTPUT
TOP VIEW
MAX1607
GND 1 IN 2 8 7 OUT OC OUT OUT OC ON OFF EN GND
MAX1607
IN 3 6 5 EN 4
SO ________________________________________________________________ Maxim Integrated Products 1
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USB Current-Limited Switch in Pin-Compatible Package MAX1607
ABSOLUTE MAXIMUM RATINGS
IN, EN, OC to GND .....................................................-0.3 to +6V OUT to GND ................................................-0.3V to (VIN + 0.3V) Maximum Switch Current.........................1.2A (internally limited) OUT Short-Circuit to GND ..........................................Continuous Continuous Power Dissipation (TA = +70C) 8-Pin SO (derate 5.88mW/C above +70C)................471mW Operating Temperature Range (extended) .........-40C to +85C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10sec) .............................+300C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VIN = +5V, TA = 0C to +85C, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER OPERATING CONDITION Input Voltage POWER SWITCH Switch Static Drain-Source On-State Resistance Switch Turn-On Time Switch Turn-Off Time ENABLE INPUT (EN) EN High-Level Input Voltage EN Low-Level Input Voltage EN Input Current Start-Up Time CURRENT LIMIT Overload Output Current Short-Circuit Output Current SUPPLY CURRENT Supply Current, Low-Level Input Supply Current, High-Level Input Supply Leakage Current UNDERVOLTAGE LOCKOUT Undervoltage Lockout OVERCURRENT (OC) OC Output Low Voltage OC Off-State Current OC Blanking Timeout Period THERMAL SHUTDOWN Thermal Shutdown Threshold 2 +165 C tBL VOL ISINK = 1mA, VIN = 3V VIN = V OC = 5V From overcurrent condition to OC assertion 7 10 0.4 1 13 V A ms UVLO Rising edge, 100mV hysteresis 2.0 2.4 2.6 V IQ V EN = VIN = VOUT = 5.5V V EN = GND, IOUT = 0 V EN = VIN = 5.5V, VOUT = GND Timer not running Timer running TA = +25C TA = 0C to +85C 0.001 14 35 0.01 2 15 1 25 A A A ILIMIT ISC Force VOUT to 4.5V OUT shorted to GND 700 850 500 1000 700 mA mA VIH VIL VIN = 2.7V to 3.6V VIN = 3.7V to 5.5V VIN = 2.7V to 5.5V V EN = VIN or GND VIN = 5V, COUT = 150F from EN driven low to 50% full VOUT -1 1 2.0 2.4 0.8 1 V V A ms TA = +25C RDS(ON) tON tOFF TA = 0C to +85C ILOAD = 400mA ILOAD = 400mA 3 VIN = 4.4V to 5.5V VIN = 4.4V to 5.5V VIN = 3V 72 80 6 60 90 125 150 200 20 s s m VIN 2.7 5.5 V SYMBOL CONDITIONS MIN TYP MAX UNITS
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USB Current-Limited Switch in Pin-Compatible Package
ELECTRICAL CHARACTERISTICS
(VIN = +5V, TA = -40C to +85C, unless otherwise noted.) (Note 1) PARAMETER OPERATING CONDITION Input Voltage POWER SWITCH Switch Static Drain-Source On-State Resistance Switch Turn-On Time Switch Turn-Off Time ENABLE INPUT (EN) EN High-Level Input Voltage EN Low-Level Input Voltage EN Input Current CURRENT LIMIT Overload Output Current Short-Circuit Output Current SUPPLY CURRENT Supply Current, Low-Level Input Supply Current, High-Level Input Supply Leakage Current UNDERVOLTAGE LOCKOUT Undervoltage Lockout OVERCURRENT (OC) OC Output Low Voltage OC Off-State Current OC Blanking Timeout Period tBL UVLO VOL Rising edge, 100mV hysteresis ISINK = 1mA, VIN = 3V VIN = V OC = 5V From overcurrent condition to OC assertion 6 2.0 2.9 0.4 1 14 V V A ms IQ V EN = VIN = VOUT = 5.5V V EN = GND, IOUT = 0, timer not running V EN = VIN = 5.5V, VOUT = GND 2 25 15 A A A ILIMIT ISC Force VOUT to 4.5V OUT shorted to GND 640 1060 750 mA mA VIH VIL VIN = 3.0V to 3.6V VIN = 3.7V to 5.5V VIN = 3.0V to 5.5V V EN = VIN or GND -1 2.0 2.4 0.8 1 V V A RDS(ON) tON tOFF VIN = 4.4V to 5.5V VIN = 3V ILOAD = 400mA ILOAD = 400mA 1 125 150 200 20 m s s VIN 3.0 5.5 V SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX1607
Note 1: Specifications to -40C are guaranteed by design, not production tested.
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USB Current-Limited Switch in Pin-Compatible Package MAX1607
Typical Operating Characteristics
(VIN = +5V, TA = +25C, unless otherwise noted.)
OFF SUPPLY CURRENT vs. TEMPERATURE
VEN = VIN OFF SUPPLY CURRENT (nA) 10
MAX1607-03
QUIESCENT CURRENT vs. INPUT VOLTAGE
MAX1607-01
QUIESCENT CURRENT vs. TEMPERATURE
VIN = 5V 15 QUIESCENT CURRENT (A) 14 13 12 11 10 9 0.01 -40 -20 0 20 40 60 80 100 -40 -20 TEMPERATURE (C) VIN = 3V
MAX1607-02
16 14 QUIESCENT CURRENT (A) 12 10 8 6 4 2 0 0
VEN = GND IOUT = 0
16
100
1
0.1
1
2
3
4
5
6
INPUT VOLTAGE (V)
0 20 40 60 TEMPERATURE (C)
80
100
OFF SWITCH CURRENT vs. TEMPERATURE
VEN = VIN
MAX1607-04
NORMALIZED ON-RESISTANCE vs. TEMPERATURE
IOUT = 425mA 1.2 NORMALIZED RON 1.0 0.8 0.6 0.4
MAX1607-05
NORMALIZED OUTPUT CURRENT vs. OUTPUT VOLTAGE
ILIMIT
MAX1607-06
1000
1.4
1.2 NORMALIZED OUTPUT CURRENT 1.0 0.8 SHORT-CIRCUIT CURRENT 0.6 0.4 0.2 0
OFF SWITCH CURRENT (nA)
100
10
1
0.1
0.2 0 -40 -20 0 20 40 60 80 100 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) TEMPERATURE (C)
0.01
0
1
2
3
4
5
6
OUTPUT VOLTAGE (V)
TURN-ON TIME vs. TEMPERATURE
MAX1607-07
TURN-OFF TIME vs. TEMPERATURE
MAX1607-08
FAULT-BLANKING TIMEOUT vs. TEMPERATURE
MAX1607-09
160 140 120
ILOAD = 425mA VIN = 3V
7 6 5 tOFF (s) 4 3 2 1 0
ILOAD = 425mA VIN = 5V
12 FAULT-BLANKING TIMEOUT (ms) 10 8 6 4 2 0
100 tON (s) 80 60 40 20 0 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) VIN = 5V
VIN = 3V
VIN = 3V OR 5V IOUT = 850mA -40 -20 0 20 40 60 80 100
-40
-20
0
20
40
60
80
100
TEMPERATURE (C)
TEMPERATURE (C)
4
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USB Current-Limited Switch in Pin-Compatible Package
Typical Operating Characteristics (continued)
(VIN = +5V, TA = +25C, unless otherwise noted.)
MAX1607
CURRENT-LIMIT AND OC RESPONSE
MAX1607-10
CURRENT-LIMIT RESPONSE
MAX1607-11
SWITCH TURN-ON TIME
MAX1607-12
CH1
CH1
CH1 CH2 CH2 CH2
CH3
CH3
CH3
CH4 2ms/div CH1 = VIN, 200mV/div, AC-COUPLED CH2 = VOUT, 5V/div CH3 = VOC, 5V/div CH4 = IOUT, 500mA/div
CH4 10s/div CH1 = VIN, 200mV/div, AC-COUPLED CH2 = VOUT, 5V/div CH3 = VOC, 5V/div CH4 = IOUT, 1A/div
CH4 20s/div CH1 = VOUT, 5V/div CH2 = VEN, 5V/div CH3 = VOC, 5V/div CH4 = IOUT, 200mA/div
SWITCH TURN-OFF TIME
MAX1607-13
START-UP TIME (TYPICAL USB APPLICATION)
CH1
MAX1607-14
CH1 CH2 CH2 FULL CURRENT LIMIT CHARGES CAPACITOR RESISTOR LOAD CURRENT CH3 CH3 CH4 CH4 1s/div CH1 = VOUT, 5V/div CH2 = VEN, 5V/div CH3 = VOC, 5V/div CH4 = IOUT, 200mA/div 1ms/div VIN = 5V, RL = 15, CL = 150F CH1 = VOUT, 5V/div CH2 = VEN, 5V/div CH3 = IIN, 500mA/div CH4 = VOC, 5V/div SHORT-CIRCUIT CURRENT LIMIT
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USB Current-Limited Switch in Pin-Compatible Package MAX1607
Pin Description
PIN 1 2, 3 4 5 6, 7, 8 NAME GND IN EN OC OUT Ground Input. P-channel MOSFET source--connect all IN pins together and bypass with a 1F 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 0.1F capacitor to ground. FUNCTION
Continuous Short-Circuit Protection
IN P OUT
MAX1607
OC P
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.
Thermal Shutdown
The MAX1607 has a thermal shutdown feature. The switch turns off and the OC output goes low immediately (no overcurrent blanking) when the junction temperature exceeds +165C. When the MAX1607 cools 20C, the switch turns back on. If the fault short-circuit condition is not removed, the switch will cycle on and off, resulting in a pulsed output.
N
REPLICA AMPLIFIER ON P
ON
CURRENT-LIMIT AMPLIFIER 1.24V
OC Indicator
The MAX1607 provides an overcurrent output (OC). A 100k 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 undervoltagelockout (UVLO) threshold. * The die temperature exceeds the thermal shutdown temperature limit of +165C. * The device is in current limit for greater than 10ms.
10ms TIMER HOT EN CONTROL CIRCUITRY
GND
Figure 1. Functional Diagram
OC Blanking
Detailed Description
The MAX1607 P-channel MOSFET power switch limits output current to 0.7A min and 1.0A max. When the output current is increased beyond the current limit (ILIMIT), the current also increases through the replica switch (IOUT / 6500). The current-limit error amplifier compares the voltage to the internal 1.24V reference and regulates the current back to the ILIMIT (Figure 1). These switches are not bidirectional; therefore, the input voltage must be higher than the output voltage.
6
The MAX1607 features 10ms overcurrent blanking. Blanking allows brief current-limit faults, including momentary short-circuit faults that occur when hotswapping 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 counter starts. If the load fault persists beyond the 10ms overcurrent-blanking timeout, the OC output asserts low. Ensure that the MAX1607 input is adequately bypassed to prevent input glitches from triggering spurious OC outputs. Input voltage glitches less
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USB Current-Limited Switch in Pin-Compatible Package
than 150mV will not cause a spurious OC output. Loadtransient faults less than 10ms (typ) will not cause an OC output assertion. Only current-limit faults are blanked. Die overtemperature faults and input voltage droops below the UVLO threshold will cause an immediate OC output. Under normal operating conditions, the package can dissipate and channel heat away. Calculate the maximum power dissipation as follows: P = (ILIMIT)2 * RON where ILIMIT is the preset current limit (1.0A max) and RON is the on-resistance of the switch (125m max). When the output is short circuited, foldback-current limiting 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-overload-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.
MAX1607
Applications Information
Input Capacitor
To limit the input voltage drop during momentary output short-circuit conditions, connect a capacitor from IN to GND. A 1F ceramic capacitor will be adequate for most applications; however, higher capacitor values will further reduce the voltage drop at the input (Figure 2).
Output Capacitor
Connect a 0.1F capacitor from OUT to GND. This capacitor helps to prevent inductive parasitics from pulling OUT negative during turn-off.
Chip Information
TRANSISTOR COUNT: 715
Layout and Thermal Dissipation
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.
INPUT 1F 100k OVERCURRENT OUTPUT OFF ON
IN
OUT
OUTPUT 0.1F*
MAX1607
OC
EN GND
*USB SPECIFICATIONS REQUIRE A HIGHER VALUE CAPACITOR.
Figure 2. Typical Application Circuit
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USB Current-Limited Switch in Pin-Compatible Package MAX1607
Package Information
SOICN.EPS
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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