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PDF FP6861 Data sheet ( Hoja de datos )
| Número de pieza | FP6861 | |
| Descripción | Single-Channel 1.1A USB High-Side Power Switch with Flag | |
| Fabricantes | Fiti | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de FP6861 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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fitipower integrated technology lnc.
FP6861
Single-Channel 1.1A USB
High-Side Power Switch with Flag
Description
The FP6861 is a single channel USB power switch
which is optimized for the self-powered and the
bus-powered Universal Serial Bus (USB)
applications. It is cost-effective, low voltage and
equipped single N-Channel high-side MOSFET
switch.
For driving the internal MOSFET switch, a charge
pump circuitry is built in the FP6861. The switch's
low RDS(ON), 95mΩ, meets USB voltage drop
requirement, and a fault flag output is available to
indicate fault conditions to the local USB controller.
Other additional features include under-voltage
lockout (UVLO) to ensure that the device keeps off
until input a valid voltage, thermal shutdown to
prevent catastrophic switch failure from high loading
current and fault current is limited to typically 1.5A for
in accordance with the USB power requirements.
Soft-start to limit inrush current during plug-in and
lower quiescent current as 33μA making this device
ideal for portable battery-operated equipment.
The FP6861 is available in SOT-23-5 package
requiring minimum board space and smallest
components.
Features
● Guaranteed 1.1A Continuous Load Current
● Input Voltage Ranges : 2V to 5.5V
● Open-Drain Fault Flag Output
● Built-In N-Channel MOSFET : Typically 95mΩ
● Output Can Be Forced Higher Than Input
(Off-State)
● 1.7V Typical Under-Voltage Lockout (UVLO)
● Low Supply Current :
33μA Typical at Switch On State
0.1μA Typical at Switch Off State
● Hot Plug-In Application (Soft-Start)
● Current Limiting Protection
● Thermal Shutdown Protection
● Reverse Current Flow Blocking (No Body Diode)
● Logic Level Enable Pin, Available with Active
High and Active-Low Versions
● RoHS Compliant
● UL Approved -E322418
Applications
● Notebook PCs
● LCD Monitors
● USB Bus/Self Powered Hubs
● USB Peripherals
● ACPI Power Distribution
Pin Assignments
S5 Package (SOT-23-5)
Figure 1. Pin Assignment of FP6861
FP6861-1.5-FEB-2010
Ordering Information
FP6861□□□□
TR: Tape / Reel
P: Green
G: Green
Blank: Active High
L: Active Low
Package Type
S5: SOT-23-5
SOT-23-5 Marking
Part Number
FP6861S5P
Product
Code
J1
FP6861S5G
J1=
Part Number
FP6861S5LG
Produ
ct
T9=
1
1 page  
fitipower integrated technology lnc.
FP6861
Typical Performance Curves
60
50
40
30
20
VIN=VEN=5V
10 CIN=10µF
RL=Open
0
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
Input Voltage (V)
Figure 5. Supply Current vs. Input Voltage
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4 VIN=VEN=5V
0.2 CIN=COUT=10µF
0.0
2.0 2.5 3.0 3.5 4.0 4.5 5.0
Input Voltage (V)
5.5
Figure 7.Current Limit vs. Input Voltage
160
140 IOUT=1.1A
CIN=COUT=10µF
120
100
80
60
40
20
0
2.0 2.5 3.0 3.5 4.0 4.5 5.0
Input Voltage (V)
Figure 9.On-Resistance vs. Input Voltage
5.5
40
35
30
25
20
15
10 VIN=VEN=5V
CIN=COUT=10µF
5 RL=Open
0
-40 -20
0
20 40 60 80 100 120
Temperature (°C)
Figure 6. Supply Current vs. Temperature
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0 VIN=5V
0.8 CIN=10µF
0.6 COUT=10µF
0.4
-40
-20
0 20 40 60 80
Tempature (DEG_C)
100 120
Figure 8.Current Limit vs. Temperature
160
140 VIN=5V
IOUT=1.1A
120 CIN=COUT=10µF
100
80
60
40
20
0
-40 -20 0 20 40 60 80 100
Tempature (°C)
Figure 10.On-Resistance vs. Temperature
120
FP6861-1.5-FEB-2010
5
5 Page 
fitipower integrated technology lnc.
FP6861
Application Information (Continued)
Fault Flag
The FP6186 provides a /FLG signal pin which is an
N-Channel open drain MOSFET output. This open
drain output goes low when VOUT < VIN-1V, current
limit or the die temperature exceeds 160°C
approximately. The /FLG output is capable of sinking
a 10mA load to typically 200mV above ground. The
/FLG pin requires a pull-up resistor; this resistor
should be large in value to reduce energy drain. A
100kΩpull-up resistor works well for most
applications. In the case of an over-current condition,
/FLG will be asserted only after the 60ms flag
response delay time. This ensures that /FLG is
asserted only upon valid over-current conditions and
that erroneous error reporting is eliminated.
For example, false over-current conditions may
occur during hot-plug events when extremely large
capacitive loads are connected and causes a high
transient inrush current that exceeds the current limit
threshold.
UVLO Under-Voltage Lockout
Under-voltage lockout (UVLO) prevents the
MOSFET switch from turning on until input voltage
exceeds approximately 1.7V. If input voltage drops
below approximately 1.6V, UVLO turns off the
MOSFET switch, /FLG will be asserted accordingly.
Current Limiting and Short-Circuit Protection
The current limit circuitry prevents damage to the
MOSFET switch and the hub downstream port but
can deliver load current up to the current limit
threshold of typically 1.5A through the switch of
FP6861. When a heavy load or short circuit is
applied to an enabled switch, a large transient
current may flow until the current limit circuitry
responds. Once this current limit threshold is
exceeded the device enters constant current mode
until the thermal shutdown occurs or the fault is
removed.
Thermal Shutdown
Thermal shutdown is employed to protect the
device from damage if the die temperature
exceeds approximately 160°C.
The power switch will auto-recover when the IC is
cooling down. The thermal hysteresis temperature
is about 30°C.
Power Dissipation
The device’s junction temperature depends on
several factors such as the load, PCB layout,
ambient temperature and package type. The
output pin of FP6861 can deliver a current up to
1.1A, respectively over the full operating junction
temperature range. However, the maximum
output current must be decreased at higher
ambient temperature to ensure the junction
temperature does not exceed 160°C. With all
possible conditions, the junction temperature
must be within the range specified under
operating conditions. Power dissipation can be
calculated based on the output current and the
RDS(ON) of switch as below.
PD = RDS(ON) x (IOUT)2
Although the devices are rated for 1.1A of output
current, but the application may limit the amount
of output current based on the total power
dissipation and the ambient temperature. The
final operating junction temperature for any set of
conditions can be estimated by the following
thermal equation :
PD (MAX) = ( TJ(MAX) − TA ) / θJA
Where TJ(MAX) is the maximum operation junction
temperature 125°C, TA is the ambient
temperature and the θ JA is the junction to
ambient thermal resistance.
The junction to ambient thermal resistance θJA is
layout dependent. For SOT-23-5 packages, the
thermal resistance θ JA is 250°C/W on the
standard JEDEC 51-3 single-layer thermal test
board.
FP6861-1.5-FEB-2010
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet FP6861.PDF ] | |
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