MAX869L

Manufacturer Part NumberMAX869L
DescriptionThe MAX869L P-channel load switch features an accurate user-set current limit and low on-resistance
ManufacturerMaxim
MAX869L datasheet
 


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19-1278; Rev 0; 8/97
P-Channel Switch with Thermal Shutdown
_______________General Description
The MAX869L P-channel load switch features an accu-
rate user-set current limit and low on-resistance. This
switch is designed to protect your power source from
shorts and surges by limiting current and preventing
the system supply from being pulled low. The input volt-
age range is 2.7V to 5.5V.
The MAX869L features a 2A, 45mΩ switch controlled
by a logic signal. Current-limit accuracy is ±21%, and
can be set from 400mA to 2.4A using a single resistor.
The device has a low 12µA quiescent supply current,
which reduces to 2µA max in shutdown. It features ther-
mal-shutdown protection and a logic-signal output pin
(FAULT) that signals when there is an overcurrent or
overtemperature condition.
For other devices in this family, consult the Selector
Guide .
_____________________Selector Guide
R
NOMINAL
ON
PART
AT 3V
CURRENT
(mΩ)
(A)
MAX869L
45
2
MAX890L
90
1
MAX891L
150
0.5
MAX892L
300
0.25
MAX894L
150
0.5
MAX895L
300
0.25
________________________Applications
Universal Serial Bus (USB)
Notebook Computers
Personal Communicators
Palmtop Computers
Hand-Held Instruments
Portable Medical Instruments
Pin Configuration appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
2A, Current-Limited, High-Side
____________________________Features
Very Small Footprint (16-pin QSOP is the same
size as an 8-pin SO)
Low Resistance: 45mΩ at 3V
±21%-Accurate, User-Set Current Limit
12µA (typ) Quiescent Current
0.01µA (typ) Shutdown Current
0.04µA (typ) Leakage to Output when Switch
is Off
2.7V to 5.5V Input Range
Thermal Shutdown
FAULT Output
______________Ordering Information
PART
MAX869LC/D
COUNT
PACKAGE
MAX869LEEE
* Dice are specified at T
Single
16 QSOP
Single
8 SO
Single
8 µMAX
Single
8 µMAX
__________Typical Operating Circuit
Dual
8 SO
Dual
8 SO
INPUT
2.7V TO 5.5V
1 F
*
FOR USB APPLICATIONS, C
TEMP. RANGE
PIN-PACKAGE
0°C to +70°C
Dice*
-40°C to +85°C
16 QSOP
= +25°C.
A
IN
OUT
*
MAX869L
100k
FAULT
ON
GND
SET
R
SET
= 1 F, C
= 120 F
IN
OUT
OUTPUT
UP TO 2A
*
0.1 F
ON/OFF
1

MAX869L Summary of contents

  • Page 1

    ... Rev 0; 8/97 P-Channel Switch with Thermal Shutdown _______________General Description The MAX869L P-channel load switch features an accu- rate user-set current limit and low on-resistance. This switch is designed to protect your power source from shorts and surges by limiting current and preventing the system supply from being pulled low. The input volt- age range is 2.7V to 5.5V. The MAX869L features a 2A, 45mΩ ...

  • Page 2

    ... Note 1: Guaranteed by design. Derived from the I Note 2: Tested with I = 200mA and V OUT Note 3: Specifications to -40°C are guaranteed by design, not production tested. 2 _______________________________________________________________________________________ Operating Temperature Range MAX869LEEE.....................................................-40°C to +85°C + 0.3V) Storage Temperature Range ........................... -65°C to +150°C IN Lead Temperature (soldering, 10sec) .............................+300°C = +25°C.) A CONDITIONS ...

  • Page 3

    P-Channel Switch with Thermal Shutdown ELECTRICAL CHARACTERISTICS ( -40°C to +85°C, unless otherwise noted.) (Note PARAMETER Operating Voltage Quiescent Current Off-Supply Current Off-Switch Current Undervoltage Lockout On-Resistance Nominal Current-Limit Set Range Current-Limit-Amplifier Threshold ...

  • Page 4

    Current-Limited, High-Side P-Channel Switch with Thermal Shutdown __________________________________________Typical Operating Characteristics (T = +25°C, unless otherwise noted.) A QUIESCENT CURRENT vs. INPUT VOLTAGE GND OUT ...

  • Page 5

    P-Channel Switch with Thermal Shutdown ____________________________Typical Operating Characteristics (continued +25°C, unless otherwise noted.) A FAST CURRENT-LIMIT RESPONSE 2µs/div C = 100µ 0.1µF IN OUT 5V/div ...

  • Page 6

    ... OUT _______________Detailed Description The MAX869L P-channel MOSFET power switch limits output current to a programmed level. When the output current passes through the main switch, a smaller cur- rent also passes through the replica switch (I and through R exceeds the trip voltage of 1.24V, the current-limit error ...

  • Page 7

    ... R SET 1.24V Figure 2. Setting the Current Limit GND The MAX869L provides a fault output (FAULT). This open-drain output goes low when in current limit or when the die temperature exceeds 135°C. A 100kΩ pull-up resistor from FAULT to IN provides a logic- control signal. __________Applications Information To limit the input voltage drop during momentary output ≤ ...

  • Page 8

    ... LIMIT ON where R is the on-resistance of the switch. ON __________________Pin Configuration TOP VIEW IN 1 OUT 2 OUT 3 MAX869L OUT GND 8 QSOP Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product ...