MAX1607 [MAXIM]
USB Current-Limited Switch in Pin-Compatible Package; USB限流开关引脚兼容封装
| 型号： | MAX1607 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | USB Current-Limited Switch in Pin-Compatible Package |
| 文件： | 总8页 (文件大小：134K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1544; Rev 0; 10/99
USB Current-Limited Switch
in Pin-Compatible Package
MAX1607
General Description
Features
The MAX1607 is a current-limited 60mΩ 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 (14µA) and standby current
(1µA) 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.
♦ Pin Compatible with TPS2014, TPS2015, and
TPS2041
♦ Accurate Current Limit (0.7A min, 1.0A max)
♦ Guaranteed 0.75A Short-Circuit Protection
♦ 10ms Internal OC Blanking Timeout
♦ No Overcurrent (OC) Signal During Power-Up
♦ 125mΩ max High-Side MOSFET
♦ 500mA Continuous Current
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.
♦ Short-Circuit and Thermal Protection with
Overcurrent Logic Output
♦ 1ms Start-Up Time
The MAX1607 has several safety features to ensure that
the USB port is protected. Built-in thermal-overload pro-
tection limits power dissipation and junction tempera-
ture. The device also has accurate internal current-
limiting circuitry to protect the input supply against
overload.
♦ Undervoltage Lockout
♦ 14µA Quiescent Supply Current
♦ 1µA max Standby Supply Current
♦ +2.7V to +5.5V Supply Range
♦ UL Recognition Pending
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 µMAX 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 condi-
tion.
Ordering Information
PART
TEMP. RANGE
PIN-PACKAGE
MAX1607ESA
-40°C to +85°C
8 SO
Applications
Notebook Computers
USB Ports
Typical Operating Circuit
USB Hubs
Docking Stations
INPUT
+2.7V TO +5.5V
Pin Configuration
IN
OUT
OUTPUT
TOP VIEW
MAX1607
GND
IN
1
2
3
4
8
7
6
5
OUT
OUT
OUT
OC
OC
EN
OFF
ON
MAX1607
IN
GND
EN
SO
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
USB Current-Limited Switch
in Pin-Compatible Package
ABSOLUTE MAXIMUM RATINGS
Continuous Power Dissipation (T = +70°C)
8-Pin SO (derate 5.88mW/°C above +70°C)................471mW
IN, EN, OC to GND.....................................................-0.3 to +6V
A
OUT to GND ................................................-0.3V to (V + 0.3V)
IN
Operating Temperature Range (extended).........-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+300°C
Maximum Switch Current.........................1.2A (internally limited)
OUT Short-Circuit to GND..........................................Continuous
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.
MAX1607
ELECTRICAL CHARACTERISTICS
(V = +5V, T = 0°C to +85°C, unless otherwise noted. Typical values are at T = +25°C.)
IN
A
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
OPERATING CONDITION
Input Voltage
V
IN
2.7
5.5
V
POWER SWITCH
T
T
= +25°C
V
IN
V
IN
V
IN
= 4.4V to 5.5V
= 4.4V to 5.5V
= 3V
60
90
125
150
200
20
A
Switch Static Drain-Source
On-State Resistance
R
mΩ
DS(
ON)
= 0°C to +85°C
A
72
80
6
Switch Turn-On Time
Switch Turn-Off Time
ENABLE INPUT (EN)
t
I
I
= 400mA
= 400mA
µs
µs
ON
LOAD
t
3
OFF
LOAD
V
IN
V
IN
V
IN
V
EN
= 2.7V to 3.6V
= 3.7V to 5.5V
= 2.7V to 5.5V
2.0
2.4
V
V
EN High-Level Input Voltage
IH
V
0.8
1
V
EN Low-Level Input Voltage
EN Input Current
IL
= V or GND
IN
-1
µA
V
= 5V, C
= 150µF from EN driven
OUT
IN
OUT
Start-Up Time
1
ms
low to 50% full V
CURRENT LIMIT
Overload Output Current
Short-Circuit Output Current
SUPPLY CURRENT
I
Force V
to 4.5V
700
850
500
1000
700
mA
mA
LIMIT
OUT
I
OUT shorted to GND
SC
Supply Current, Low-Level Input
V
V
= V = V
= 5.5V
0.001
14
1
µA
µA
EN
EN
IN
OUT
Timer not running
Timer running
25
Supply Current, High-Level
Input
I
Q
= GND, I
= 0
OUT
35
T
T
= +25°C
0.01
2
A
A
V
V
= V = 5.5V,
IN
EN
Supply Leakage Current
µA
V
= GND
OUT
= 0°C to +85°C
15
UNDERVOLTAGE LOCKOUT
Undervoltage Lockout
UVLO
Rising edge, 100mV hysteresis
2.0
7
2.4
2.6
OVERCURRENT (OC)
V
OL
I
= 1mA, V = 3V
0.4
1
V
OC Output Low Voltage
OC Off-State Current
SINK
IN
V
IN
= V
= 5V
OC
µA
ms
t
BL
10
13
OC Blanking Timeout Period
THERMAL SHUTDOWN
Thermal Shutdown Threshold
From overcurrent condition to OC assertion
+165
°C
2
_______________________________________________________________________________________
USB Current-Limited Switch
in Pin-Compatible Package
MAX1607
ELECTRICAL CHARACTERISTICS
(V = +5V, T = -40°C to +85°C, unless otherwise noted.) (Note 1)
IN
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
OPERATING CONDITION
Input Voltage
V
IN
3.0
5.5
V
POWER SWITCH
V
V
= 4.4V to 5.5V
125
150
200
20
IN
Switch Static Drain-Source
On-State Resistance
R
mΩ
DS(
ON)
= 3V
IN
Switch Turn-On Time
Switch Turn-Off Time
ENABLE INPUT (EN)
t
I
= 400mA
= 400mA
µs
µs
ON
LOAD
LOAD
t
I
1
OFF
V
IN
V
IN
V
IN
V
EN
= 3.0V to 3.6V
= 3.7V to 5.5V
= 3.0V to 5.5V
2.0
2.4
V
V
EN High-Level Input Voltage
IH
V
0.8
1
V
EN Low-Level Input Voltage
EN Input Current
IL
= V or GND
IN
-1
µA
CURRENT LIMIT
Overload Output Current
Short-Circuit Output Current
SUPPLY CURRENT
I
Force V
to 4.5V
640
1060
750
mA
mA
LIMIT
OUT
I
OUT shorted to GND
SC
Supply Current, Low-Level Input
V
V
V
= V = V
= 5.5V
2
µA
µA
µA
EN
EN
EN
IN
OUT
Supply Current, High-Level
Input
I
= GND, I
= 0, timer not running
25
15
Q
OUT
Supply Leakage Current
UNDERVOLTAGE LOCKOUT
Undervoltage Lockout
= V = 5.5V, V
= GND
OUT
IN
UVLO
Rising edge, 100mV hysteresis
= 1mA, V = 3V
2.0
6
2.9
V
OVERCURRENT (OC)
OC Output Low Voltage
OC Off-State Current
V
OL
I
0.4
1
V
SINK
IN
V
IN
= V
= 5V
OC
µA
ms
t
BL
14
OC Blanking Timeout Period
From overcurrent condition to OC assertion
Note 1: Specifications to -40°C are guaranteed by design, not production tested.
_______________________________________________________________________________________
3
USB Current-Limited Switch
in Pin-Compatible Package
Typical Operating Characteristics
(V = +5V, T = +25°C, unless otherwise noted.)
IN
A
OFF SUPPLY CURRENT
vs. TEMPERATURE
QUIESCENT CURRENT vs. INPUT VOLTAGE
QUIESCENT CURRENT vs. TEMPERATURE
100
10
16
14
12
10
8
16
15
14
13
12
11
10
9
V
= GND
= 0
EN
V
= 5V
IN
V
= V
EN IN
I
OUT
MAX1607
V
IN
= 3V
1
6
4
0.1
0.01
2
0
0
1
2
3
4
5
6
-40 -20
0
20
40
60
80 100
-40 -20
0
20
40
60
80 100
INPUT VOLTAGE (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
NORMALIZED OUTPUT CURRENT
vs. OUTPUT VOLTAGE
NORMALIZED ON-RESISTANCE
vs. TEMPERATURE
OFF SWITCH CURRENT
vs. TEMPERATURE
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
1.2
1.0
0.8
0.6
0.4
0.2
0
1000
100
10
V
= V
EN
IN
I
= 425mA
OUT
I
LIMIT
SHORT-CIRCUIT CURRENT
1
0.1
0.01
0
1
2
3
4
5
6
-40 -20
0
20
40
60
80 100
-40 -20
0
20
40
60
80 100
OUTPUT VOLTAGE (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
FAULT-BLANKING TIMEOUT
vs. TEMPERATURE
TURN-OFF TIME vs. TEMPERATURE
TURN-ON TIME vs. TEMPERATURE
160
140
120
100
80
7
6
5
4
3
2
1
0
12
10
8
I
= 425mA
I
= 425mA
LOAD
LOAD
V
IN
= 5V
V
= 3V
IN
V
IN
= 3V
6
V
IN
= 5V
60
4
2
0
40
20
V
OUT
= 3V OR 5V
= 850mA
IN
I
0
-40 -20
0
20
40
60
80 100
-40 -20
0
20
40
60
80 100
-40 -20
0
20
40
60
80 100
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
4
_______________________________________________________________________________________
USB Current-Limited Switch
in Pin-Compatible Package
MAX1607
Typical Operating Characteristics (continued)
(V = +5V, T = +25°C, unless otherwise noted.)
IN
A
CURRENT-LIMIT AND OC RESPONSE
SWITCH TURN-ON TIME
CURRENT-LIMIT RESPONSE
CH1
CH2
CH3
CH4
CH1
CH2
CH3
CH4
CH1
CH2
CH3
CH4
10µs/div
20µs/div
2ms/div
CH1 = V , 200mV/div, AC-COUPLED
IN
CH1 = V , 5V/div
OUT
CH1 = V , 200mV/div, AC-COUPLED
IN
CH2 = V , 5V/div
CH2 = V , 5V/div
CH2 = V , 5V/div
OUT
EN
OUT
CH3 = V , 5V/div
OC
CH3 = V , 5V/div
OC
CH3 = V , 5V/div
OC
CH4 = I , 500mA/div
CH4 = I , 200mA/div
CH4 = I , 1A/div
OUT
OUT
OUT
START-UP TIME
(TYPICAL USB APPLICATION)
SWITCH TURN-OFF TIME
CH1
CH2
CH1
CH2
FULL CURRENT LIMIT CHARGES CAPACITOR
RESISTOR LOAD CURRENT
CH3
CH4
SHORT-CIRCUIT
CURRENT LIMIT
CH3
CH4
1µs/div
1ms/div
V
= 5V, R = 15Ω, C = 150µF
CH1 = V , 5V/div
OUT
IN
L
L
CH1 = V , 5V/div
CH2 = V , 5V/div
OUT
EN
CH2 = V , 5V/div
EN
CH3 = V , 5V/div
OC
CH3 = I , 500mA/div
CH4 = I , 200mA/div
IN
OC
OUT
CH4 = V , 5V/div
_______________________________________________________________________________________
5
USB Current-Limited Switch
in Pin-Compatible Package
Pin Description
PIN
1
NAME
GND
IN
FUNCTION
Ground
2, 3
4
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.
EN
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.
MAX1607
5
OC
Switch Output. P-channel MOSFET drain—connect all OUT pins together and bypass with a 0.1µF
capacitor to ground.
6, 7, 8
OUT
Continuous Short-Circuit Protection
The MAX1607 is a short-circuit-protected switch. In the
P
event of an output short-circuit condition, the current
IN
OUT
through the switch is foldback-current-limited to 500mA
continuous.
MAX1607
OC
P
Thermal Shutdown
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.
REPLICA
AMPLIFIER
N
ON
P
ON
CURRENT-LIMIT
AMPLIFIER
OC Indicator
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:
1.24V
10ms
TIMER
HOT
•
•
•
The input voltage is below the 2.4V undervoltage-
lockout (UVLO) threshold.
GND
CONTROL
EN
CIRCUITRY
The die temperature exceeds the thermal shutdown
temperature limit of +165°C.
The device is in current limit for greater than 10ms.
Figure 1. Functional Diagram
OC Blanking
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
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
Detailed Description
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
),
LIMIT
the current also increases through the replica switch
(I / 6500). The current-limit error amplifier compares
OUT
the voltage to the internal 1.24V reference and regu-
lates the current back to the I (Figure 1).
LIMIT
These switches are not bidirectional; therefore, the
input voltage must be higher than the output voltage.
6
_______________________________________________________________________________________
USB Current-Limited Switch
in Pin-Compatible Package
MAX1607
Under normal operating conditions, the package can
dissipate and channel heat away. Calculate the maxi-
mum power dissipation as follows:
than 150mV will not cause a spurious OC output. Load-
transient faults less than 10ms (typ) will not cause an
OC output assertion.
2 • R
P = (I
)
Only current-limit faults are blanked. Die overtempera-
ture faults and input voltage droops below the UVLO
threshold will cause an immediate OC output.
LIMIT
ON
where I
ON
is the preset current limit (1.0A max) and
LIMIT
R
is the on-resistance of the switch (125mΩ max).
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.
Applications Information
Input Capacitor
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).
Output Capacitor
Connect a 0.1µF capacitor from OUT to GND. This
capacitor helps to prevent inductive parasitics from
pulling OUT negative during turn-off.
Chip Information
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.
TRANSISTOR COUNT: 715
INPUT
IN
OUT
OUTPUT
*
0.1µF
1µF
MAX1607
100k
OVERCURRENT
OUTPUT
OC
EN
OFF
ON
GND
*
USB SPECIFICATIONS REQUIRE
A HIGHER VALUE CAPACITOR.
Figure 2. Typical Application Circuit
_______________________________________________________________________________________
7
USB Current-Limited Switch
in Pin-Compatible Package
Package Information
MAX1607
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
© 1999 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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