FP6861C-A1AS5C [FITIPOWER]

Single-Channel Power Distribution Switch;
FP6861C-A1AS5C
型号: FP6861C-A1AS5C
厂家: Fitipower    Fitipower
描述:

Single-Channel Power Distribution Switch

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中文:  中文翻译
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FP6861C  
Single-Channel  
Power Distribution Switch  
Description  
Features  
The FP6861C is a cost-effective, low voltage, single  
N-Channel MOSFET high-side power switch,  
optimized for self-powered and bus-powered  
Universal Serial Bus (USB) applications.  
Compliant to USB Specifications  
Built-In Low RDS(ON) N-Channel MOSFET  
Output can be Forced Higher than Input  
(Off-State)  
Low Supply Current:  
The FP6861C is equipped with a charge pump  
circuitry to drive the internal MOSFET switch. The  
switch's low RDS(ON) meets USB voltage drop  
requirement, and a flag output is available to indicate  
fault conditions to the local USB controller.  
65μA Typical at Switch On State  
0.1μA Typical at Switch Off State  
Wide Input Voltage Ranges: 2.7V to 5.5V  
Open-Drain Fault Flag Output  
Hot Plug-In Application (Soft-Start)  
2.2V Typical Under-Voltage Lockout (UVLO)  
Current Limit Protection  
Thermal Shutdown Protection  
Reverse Current Flow Blocking (No Body Diode)  
Logic Level Enable Pin  
Additional features include soft-start to limit inrush  
current during plug-in, thermal shutdown to prevent  
catastrophic switch failure from high-current loads,  
and under-voltage lockout (UVLO) to ensure that the  
device remains off unless there is a valid input  
voltage present. Besides, fault current is limited to  
specific current for FP6861C in single port in  
accordance with the USB power requirements.  
FP6861C will prevent reverse current when it is  
disabled and VOUT is higher than VIN.  
MSOP-8, SOP-8 and SOT-23-5 Packages  
RoHS Compliant  
UL NO.E322418 (Approved model: FP6861  
series)  
CB Test Certified, Ref. Certif. No. JPTUV-041416  
Applications  
USB Bus/Self Powered Hub  
USB Peripheral  
The FP6861C is available in MSOP-8, SOP-8 and  
SOT-23-5 packages with smallest components.  
ACPI Power Distribution  
Notebook, Motherboard PC  
Battery-Charger Circuit  
Pin Assignments  
Ordering Information  
MS Package (MSOP-8)  
FP6861C-□□□□□  
TR: Tape/Reel  
1
2
3
4
8
7
6
5
GND  
VIN  
VOUT  
VOUT  
VOUT*  
OC  
C: Green  
VIN  
Package Type  
MS: MSOP-8  
SO: SOP-8  
(EN)  
EN  
AS5: SOT-23-5  
BS5: SOT-23-5  
SO Package (SOP-8)  
Enable  
1. Active High  
2. Active Low  
3. Active High,  
Non-Discharge  
8
7
6
5
1
2
GND  
VIN  
VOUT  
VOUT  
VOUT*  
OC  
3
4
VIN  
EN  
(EN)  
Current Limit  
Refer to EC table for details.  
* The pin 6 should be considered as VOUT when circuit design  
and PCB layout, but it is NC pin actually.  
** Please see the Available Product List in next page.  
FP6861C-1.0-DEC-2015  
1
FP6861C  
AS5 Package (SOT-23-5)  
Available Product List  
FP6861C-A1MSCTR  
FP6861C-E1AS5CTR  
FP6861C-E1BS5CTR  
FP6861C-E1MSCTR  
FP6861C-E2AS5CTR  
FP6861C-F1MSCTR  
FP6861C-F1SOCTR  
FP6861C-H1MSCTR  
FP6861C-H1SOCTR  
FP6861C-I1AS5CTR  
FP6861C-I1BS5CTR  
FP6861C-I1SOCTR  
FP6861C-I2BS5CTR  
FP6861C-J3AS5CTR  
(EN)  
EN  
VIN  
FP6861C-A1AS5CTR  
FP6861C-A2MSCTR  
FP6861C-A2SOCTR  
FP6861C-A2AS5CTR  
FP6861C-A3AS5CTR  
FP6861C-B1MSCTR  
FP6861C-B1AS5CTR  
FP6861C-B1BS5CTR  
FP6861C-B1SOCTR  
FP6861C-B2AS5CTR  
FP6861C-B3AS5CTR  
FP6861C-B3BS5CTR  
FP6861C-B3MSCTR  
FP6861C-C1AS5CTR  
FP6861C-C1MSCTR  
FP6861C-C1SOCTR  
FP6861C-C2AS5CTR  
FP6861C-C2SOCTR  
5
1
4
3
2
VOUT GND  
OC  
BS5 Package (SOT-23-5)  
VOUT  
VIN  
5
1
4
3
2
GND  
EN  
OC  
(
)
EN  
Figure1. Pin Assignment of FP6861C  
SOT-23-5 Marking  
Product  
Code  
Product  
Part Number  
Part Number  
Code  
FP6861C-A1AS5C  
FP6861C-A2AS5C  
FP6861C-A3AS5C  
FP6861C-B1AS5C  
FP6861C-B1BS5C  
FP6861C-B2AS5C  
FP6861C-B3AS5C  
FP6861C-B3BS5C  
FP6861C-C1AS5C  
A9G  
FP6861C-C2AS5C  
FP6861C-E1AS5C  
FP6861C-E1BS5C  
FP6861C-E2AS5C  
FP6861C-I1AS5C  
FP6861C-I1BS5C  
FP6861C-I2BS5C  
FP6861C-J3AS5C  
A6A  
A3A  
E6G  
A8A  
F2G  
F1G  
E9G  
Fi0  
A4A  
FN9  
A0G  
D7G  
A5A  
FiZ  
FA1  
A1A  
FP6861C-1.0-DEC-2015  
2
FP6861C  
Typical Application Circuit  
(Optional)  
RFG1  
Flag Transient Filtering  
USB Controller  
Over-Current  
10K to 100K  
RFG2  
10K  
VIN  
5V  
VIN  
OC  
CF  
0.1µF  
*CIN  
10µF  
FP6861C  
EN(EN)  
GND  
Chip Enable  
VOUT  
VBUS  
D-  
D+  
COUT2  
100µF  
COUT1  
22µF  
GND  
Ferrite Beades  
Data  
*Note: In most applications, adding one 1μF capacitor is enough. If the trace to VIN is long in PCB, placing larger input capacitor is  
needed.  
Figure 2. Typical Application Circuit  
Functional Pin Description  
Pin Name  
Pin Function  
VIN  
Input Power Supply.  
Switch Output.  
Ground.  
VOUT  
GND  
EN  
Chip Enable. Pull the pin high to enable IC; Pull the pin low to shutdown IC. Do not let the pin floating.  
Chip Shutdown. Pull the pin high to shutdown IC; Pull the pin low to enable IC. Do not let the pin floating.  
Open-Drain Fault Flag Output.  
 ꢀ  
ꢁꢂ  
FP6861C-1.0-DEC-2015  
3
FP6861C  
Block Diagram  
VIN  
Current  
Limiting  
EN  
(EN)  
BIAS  
UVLO  
Gate  
Control  
Charge  
Pump  
Oscillator  
*Note  
Output Voltage  
Detection  
VOUT  
Thermal  
Protection  
Shutdown  
Signal  
OC  
Delay  
GND  
*Note: There is no discharge circuit for FP6861C-x3xxx series.  
Figure 3. Block Diagram  
Absolute Maximum Ratings  
VIN, VOUT -------------------------------------------------------------------------------------------------------- -0.3V to +6V  
-0.3V to +6V  
-0.3V to +6V  
EN (ꢀꢁ) ------------------------------------------------------------------------------------------------------------  
● Oꢂ -----------------------------------------------------------------------------------------------------------------  
Power Dissipation @TJ=125°C & TA=25°C (PD)  
MSOP-8 ---------------------------------------------------------------------------------------------- +0.63W  
SOP-8 ------------------------------------------------------------------------------------------------ +0.91W  
SOT-23-5 -------------------------------------------------------------------------------------------- +0.4W  
Package Thermal Resistance JA)  
MSOP-8 ---------------------------------------------------------------------------------------------- +160°C/W  
SOP-8 ------------------------------------------------------------------------------------------------ +110°C/W  
SOT-23-5 -------------------------------------------------------------------------------------------- +250°C/W  
Junction Temperature ------------------------------------------------------------------------------------------ +150°C  
Lead Temperature (Soldering,10 sec.) --------------------------------------------------------------------- +260°C  
Storage Temperature Range --------------------------------------------------------------------------------- -65°C to +150°C  
Note 1Stresses beyond those listed under “Absolute Maximum Ratings" may cause permanent damage to the device.  
Recommended Operating Conditions  
Supply Voltage (VIN) -------------------------------------------------------------------------------------------- +2.7V to +5.5V  
Operation Temperature Range (TOPR) ---------------------------------------------------------------------- -40°C to +85°C  
FP6861C-1.0-DEC-2015  
4
FP6861C  
Electrical Characteristics  
(VIN=5V, TA=25°C, unless otherwise specified.)  
Parameter  
Symbol  
Conditions  
Min  
Typ  
70  
Max  
100  
125  
90  
Unit  
IOUT=70% Minimum Current  
Limit, MSOP-8, SOP-8 package  
IOUT=70% Minimum Current  
Limit, SOT-23-5 package  
FP6861C-H1, IOUT=70%  
Minimum Current Limit  
Switch On Resistance  
RDS(ON)  
100  
mΩ  
60  
65  
ISW_ON  
ISW_OFF  
VIL  
Switch on, VOUT=Open  
Switch off, VOUT=Open  
Switch off  
Supply Current  
µA  
0.1  
1
0.7  
EN Threshold  
V
VIH  
Switch on  
1.8  
EN Input Current  
IEN  
VEN=Enable  
0.01  
2.45  
2.45  
2.45  
1.75  
1.75  
1.75  
1
0.1  
2.8  
2.8  
2.8  
2
µA  
RLOAD=1Ω, FP6861C-A1  
RLOAD=1Ω, FP6861C-A2  
RLOAD=1Ω, FP6861C-A3  
RLOAD=1Ω, FP6861C-B1  
RLOAD=1Ω, FP6861C-B2  
RLOAD=1Ω, FP6861C-B3  
RLOAD=1Ω, FP6861C-C1  
RLOAD=1Ω, FP6861C-C2  
RLOAD=1Ω, FP6861C-E1  
RLOAD=1Ω, FP6861C-E2  
RLOAD=1Ω, FP6861C-F1  
RLOAD=1Ω, FP6861C-H1  
RLOAD=1Ω, FP6861C-I1  
RLOAD=1Ω, FP6861C-I2  
RLOAD=1Ω, FP6861C-J3  
2.1  
2.1  
2.1  
1.5  
1.5  
1.5  
0.7  
0.7  
1.1  
1.1  
2.5  
3
2.1  
2.1  
1.28  
1.35  
1.7  
1.7  
3.4  
4
Current Limit  
ILIM  
1
A
1.4  
1.4  
2.95  
3.5  
0.55  
0.55  
1
0.775  
0.775  
1.25  
1
1
1.5  
VOUT=0V, Measured Prior to  
Thermal Shutdown  
FP6861C-A1  
VOUT=0V, Measured Prior to  
Thermal Shutdown  
FP6861C-A2  
VOUT=0V, Measured Prior to  
Thermal Shutdown  
FP6861C-A3  
VOUT=0V, Measured Prior to  
Thermal Shutdown  
FP6861C-B1  
0.55  
0.55  
0.55  
0.5  
Short Circuit Fold-Back  
Current  
ISC_FB  
A
FP6861C-1.0-DEC-2015  
5
FP6861C  
Electrical Characteristics (Continued)  
(VIN=5V, TA=25°C, unless otherwise specified.)  
Parameter  
Symbol  
Conditions  
Min  
Typ  
Max  
Unit  
VOUT=0V, Measured Prior to  
Thermal Shutdown  
FP6861C-B2  
0.5  
VOUT=0V, Measured Prior to  
Thermal Shutdown  
FP6861C-B3  
VOUT=0V, Measured Prior to  
Thermal Shutdown  
FP6861C-C1  
0.5  
0.4  
VOUT=0V, Measured Prior to  
Thermal Shutdown  
FP6861C-C2  
0.4  
VOUT=0V, Measured Prior to  
Thermal Shutdown  
FP6861C-E1  
VOUT=0V, Measured Prior to  
Thermal Shutdown  
FP6861C-E2  
VOUT=0V, Measured Prior to  
Thermal Shutdown  
FP6861C-F1  
0.45  
0.45  
0.6  
Short Circuit Fold-Back  
Current  
ISC_FB  
A
VOUT=0V, Measured Prior to  
Thermal Shutdown  
FP6861C-H1  
VOUT=0V, Measured Prior to  
Thermal Shutdown  
FP6861C-I1  
VOUT=0V, Measured Prior to  
Thermal Shutdown  
FP6861C-I2  
VOUT=0V, Measured Prior to  
Thermal Shutdown  
FP6861C-J3  
0.65  
0.45  
0.45  
0.45  
Output Leakage Current  
ILEAKAGE  
VEN=Disable, RLOAD=0Ω  
0.5  
1
µA  
µs  
10% to 90% of VOUT Rising,  
CL=120µF  
250  
Output Turn-On Rise Time  
TON_RISE  
10% to 90% of VOUT Rising,  
CL=120µF  
500  
µs  
FP6861C-B1  
ROꢂ  
Oꢂ  
ISINK=1mA  
70  
Ω
Oꢂ Output Resistance  
Oꢂ Off Current  
Oꢂ=5V  
0.01  
µA  
From Fault Condition to  
tD  
10  
ms  
Oꢂ Delay Time  
Oꢂ Assertion  
Under-Voltage Lockout  
Under-Voltage Hysteresis  
VUVLO  
VIN Increasing  
VIN Decreasing  
2.2  
0.2  
80  
V
V
Ω
Ω
ΔꢄUVLO  
Shutdown Pull Low  
Resistance (Note 2)  
RPD  
FP6861C-C2  
190  
FP6861C-1.0-DEC-2015  
6
FP6861C  
Electrical Characteristics (Continued)  
(VIN=5V, TA=25°C, unless otherwise specified.)  
Parameter  
Symbol  
TSD  
Conditions  
Min  
Typ  
135  
20  
Max  
Unit  
°C  
Thermal Shutdown  
Threshold (Note 3)  
ΔTSD  
Hysteresis  
°C  
Note 2: There is no resistor for FP6861C-x3xxx series.  
Note 3: Guarantee by design.  
FP6861C-1.0-DEC-2015  
7
FP6861C  
Test Circuit  
ROC  
VOC  
VIN  
VIN  
OC  
CIN  
FP6861C  
VOUT  
GND  
A
VOUT  
EN  
Chip Enable  
RL  
COUT  
Figure 4. Electrical Characteristic Test Circuit of FP6861C  
FP6861C-1.0-DEC-2015  
8
FP6861C  
Typical Performance Curves  
VIN= VOUT=5V, CIN=100μF, ꢂOUT=120μF, TA=+25°C, unless otherwise noted. This is measured by using FP6861C-A2MSCTR.  
IOUT=0A IOUT=1.3Aꢃ(3.8Ω)  
VOUT 2V/div.  
VOUT 2V/div.  
VEN 5V/div.  
VEN 5V/div.  
ꢁꢂ 5V/div.  
ꢁꢂ 5V/div.  
IIN 1A/div.  
IIN 1A/div.  
200μs/div.  
Figure 5. EN Start-Up  
200μs/div.  
Figure 6. EN Start-Up  
IOUT=0A  
IOUT=1.3Aꢃ(3.8Ω)  
VOUT 2V/div.  
VOUT 2V/div.  
VEN 5V/div.  
VEN 5V/div.  
ꢁꢂ 5V/div.  
ꢁꢂ 5V/div.  
IIN 200mA/div.  
IIN 1A/div.  
4ms/div.  
200μs/div.  
Figure 7. EN Power Off Test  
Figure 8. EN Power Off Test  
VOUT 5V/div.  
VEN 5V/div.  
VOUT 5V/div.  
VEN 5V/div.  
ꢁꢂ 5V/div.  
ꢁꢂ 5V/div.  
IIN 2.5A/div.  
IIN  
1A/div.  
2ms/div.  
2ms/div.  
Figure 9. Inrush Short Circuit Response  
Figure 10. Short Circuit Response at Start Up  
FP6861C-1.0-DEC-2015  
9
FP6861C  
Typical Performance Curves (Continued)  
VIN= VOUT=5V, CIN=100μF, ꢂOUT=120μF, TA=+25°C, unless otherwise noted. This is measured by using FP6861C-A2MSCTR.  
IOUT=0A~1.3A  
VIN  
COUT=120µF+100µF electronic capacitors  
200mV/div.  
VIN  
200mV/div.  
VOUT 200mV/div.  
VOUT 200mV/div.  
ꢁꢂ  
5V/div.  
ꢁꢂ  
5V/div.  
IOUT 1A/div.  
IOUT 1A/div.  
200μs/div.  
200μs/div.  
Figure 11. Load transient  
Figure 12. Load transient  
VOUT  
200mV/div. (AC)  
VOUT  
200mV/div. (AC)  
VEN  
200mV/div.  
VEN  
200mV/div.  
5V/div.  
ꢁꢂ  
ꢁꢂ  
5V/div.  
1A/div.  
IOUT  
1A/div.  
IOUT  
4μs/div.  
4μs/div.  
Figure 13. Output Load Insert Hot Plug-ꢃn with 3.8Ω (1.3A)  
Figure 14. Output Load Insert Hot Plug-Off with 3.8Ω (1.3A)  
X axis: Input Current  1A/div.  
Y axis: Output Voltage  1V/div.  
Figure 15. Over Current Protection Characteristics  
FP6861C-1.0-DEC-2015  
10  
FP6861C  
Typical Performance Curves (Continued)  
VIN= VOUT=5V, CIN=100μF, ꢂOUT=120μF, TA=+25°C, unless otherwise noted. This is measured by using FP6861C-A2MSCTR.  
1
0.8  
0.6  
0.4  
0.2  
0
200  
180  
160  
140  
120  
100  
80  
-0.2  
-0.4  
-0.6  
-0.8  
-1  
60  
40  
20  
0
2.6 2.8  
3
3.2 3.4 3.6 3.8  
4
4.2 4.4 4.6 4.8  
5
2.6 2.8  
3
3.2 3.4 3.6 3.8  
4
4.2 4.4 4.6 4.8  
5
Vin (V)  
Vin (V)  
Figure 16. Supply Current vs. Input Voltage  
Figure 17. Shutdown Current vs. Input Voltage  
200  
180  
160  
140  
120  
100  
80  
1
0.8  
0.6  
0.4  
0.2  
0
-0.2  
-0.4  
-0.6  
60  
40  
Vin=5V  
Vin=5V  
-0.8  
-1  
20  
0
-40  
-20  
0
20  
40  
60  
80  
-40  
-20  
0
20  
40  
60  
80  
Temperature  
Temperature  
Figure 18. Supply Current vs. Temperature  
Figure 19. Shutdown Current vs. Temperature  
1.6  
1.5  
1.4  
1.3  
1.2  
1.1  
1
Rising (V)  
Falling (V)  
-40  
-20  
0
20  
40  
60  
80  
Temperature  
Figure 20. Enable Input Threshold vs. Temperature  
FP6861C-1.0-DEC-2015  
11  
FP6861C  
Application Information  
Fast Shutdown Load Discharge  
The FP6861C is a single N-Channel MOSFET  
high-side power switch, optimized for self-powered  
and bus-powered Universal Serial Bus (USB)  
applications. The FP6861C operates from 2.7V to  
5.5V input voltage range and provides low supply  
current. The switch's low RDS(ON), 70mΩ, meets USB  
voltage drop requirements. It has one switch with  
enable control input. The switch has an error flag  
output to notify the USB controller when the  
current-limit, short-circuit or thermal-shutdown occurs.  
The FP6861C provides a pull down resistance  
when the device is off. The resistance could  
discharge the load capacitor fast (refer to the  
block diagram). (FP6861C-x3xxx series is  
non-discharge.)  
Input and Output  
VIN is the power source connection to the internal  
circuitry and the drain of the MOSFET. VOUT is  
the source of the MOSFET.  
In typical  
Under Voltage-Lockout  
application, current flows through the switch from  
VIN to VOUT toward the load. If VOUT is  
greater than VIN, current will flow from VOUT to  
VIN since the MOSFET is bidirectional. There is  
no parasitic body diode between drain and source  
of the MOSFET, and the FP6861C will prevent  
reverse current flow if VOUT externally forces a  
higher voltage than VIN when the output is  
disabled.  
Under-voltage Lockout (UVLO) prevents the MOSFET  
switch from turning on until input voltage exceeds  
approximately 2.2V. If input voltage drops below  
approximately 2V, UVLO will turn off the MOSFET  
switch.  
Thermal Shutdown  
Thermal shutdown is employed to protect the device  
from damage if the die temperature exceeds safe  
margins mainly due to short-circuit or current-limit.  
Thermal shutdown will shut the switch off and cause  
the Oꢂ output to go low.  
D
S
D
S
Reverse Current Blocking  
The USB specification does not allow an output  
device to source current back into the USB port.  
However, the FP6861C is designed to safely power  
noncompliant devices. When the device is disabled,  
the output will be switched to a high-impedance state,  
blocking reverse current flow from the output back to  
the input. The switch is bidirectional when it is  
enabled.  
G
G
FP6861C  
Normal MOSFET  
Soft Start for Hot Plug-In Application  
In order to eliminate the upstream voltage drop  
caused by the large inrush current during hot-plug  
events, the “soft-start” feature effectively isolates  
the power source from extremely large capacitive  
loads, satisfying the USB voltage drop  
requirements.  
Error Flag  
The FP6861C provides an open drain error flag output  
for the switch. For most applications, connect Oꢂ  
Current Limit and Short-Circuit Protection  
to VIN through a pull-up resistor. Oꢂ will go low  
when any following condition occurs:  
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 through the switch of FP6861C.  
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 exceeds the current limit threshold, the  
device will enter constant current mode until the  
thermal shutdown occurs or the fault is removed.  
a. The thermal shutdown occurs.  
b. The switch is in current limit or short circuit  
conditions.  
FP6861C-1.0-DEC-2015  
12  
FP6861C  
Application Information (Continued)  
Supply Filter/Bypass Capacitor  
The junction to ambient thermal resistance θJA is  
related to layout. For SOT-23-5 package, the  
thermal resistance θJA is 250°C/W on the standard  
JEDEC 51-3 single-layer thermal test board.  
The input capacitor must be at least 1μF low-ESR  
ceramic capacitor connected from VIN to GND, but  
can be increased without limit. Output short may  
cause sufficient ringing on the input (from source  
lead inductance) to destroy the internal control  
circuitry. The input transient must not exceed 6V of  
the absolute maximum supply voltage even for a  
short duration.  
PCB Layout  
In order to meet the voltage drop and EMI  
requirements, careful PCB layout is necessary.  
The following guidelines must be considered:  
1. Keep all VBUS traces as short as possible, and  
use at least 50-mil and 2 ounce copper for all  
VBUS traces.  
Output Filter Capacitor  
Output is recommended to use a 22μF ceramic  
capacitor in parallel with a 100μF electrolytic  
capacitor. Standard bypass methods should be  
used to minimize inductance and resistance between  
the bypass capacitor and the downstream connector  
which reduce EMI and decouple voltage drop caused  
when downstream cables are hot-insertion  
transients. Ferrite beads in series with VBUS, the  
ground line and the 0.1μF bypass capacitors at the  
power connector pins are recommended for EMI and  
ESD protection. The bypass capacitor should have  
a low dissipation factor to allow decoupling at higher  
frequencies.  
2. Locate the FP6861C as close to the output port  
as possible to limit switching noise.  
3. Locate the ceramic bypass capacitors as close  
to the VIN pins of the FP6861C as possible.  
4. Avoid vias as much as possible. If vias are  
necessary, make them as large as feasible.  
5. Place a ground plane under all circuitry to lower  
both resistance and inductance, and improve  
DC and transient performance (use a separate  
ground and power plans if possible).  
6. Place cuts in the ground plane between ports to  
help reducing the coupling of transients  
between ports.  
Power Dissipation  
The device’s junction temperature depends on  
several factors, such as the load, PCB layout,  
7. Locate the output capacitor and ferrite beads as  
close to the USB connectors as possible to  
lower impedance (mainly inductance) between  
the port and the capacitor, and improve  
transient load performance.  
ambient  
temperature  
and  
package  
type.  
However, the maximum output current must be  
decreased at higher ambient temperature to ensure  
the junction temperature does not exceed 150°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:  
2  
=RꢆS(Oꢁ)ꢇ ꢃOUT  
Although the devices are rated by current limit, 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:  
Tꢉ(MAꢈ)ꢊTA  
ꢆ(MAꢈ)  
=
θꢉA  
where TJ(MAX) is the maximum junction temperature  
125°C, TA is the ambient temperature and the θJA is  
the junction to ambient thermal resistance.  
FP6861C-1.0-DEC-2015  
13  
FP6861C  
Outline Information  
MSOP-8 Package (Unit: mm)  
DIMENSION IN MILLIMETER  
SYMBOLS  
UNIT  
MIN  
0.75  
0.00  
0.75  
0.25  
2.90  
4.80  
2.90  
0.60  
0.40  
MAX  
1.10  
0.15  
0.95  
0.35  
3.10  
5.00  
3.10  
0.70  
0.80  
A
A1  
A2  
B
D
E
E1  
e
L
Carrier Dimensions  
FP6861C-1.0-DEC-2015  
14  
FP6861C  
Outline Information (Continued)  
SOP-8 Package (Unit: mm)  
DIMENSION IN MILLIMETER  
SYMBOLS  
UNIT  
MIN  
MAX  
A
A1  
A2  
B
1.35  
1.75  
0.10  
1.25  
0.31  
4.80  
3.80  
1.20  
5.80  
0.40  
0.25  
1.50  
0.51  
5.00  
4.00  
1.34  
6.20  
1.27  
D
E
e
H
L
NoteFollowed From JEDEC MO-012-E.  
Carrier Dimensions  
FP6861C-1.0-DEC-2015  
15  
FP6861C  
Outline Information (Continued)  
SOT-23-5 Package (Unit: mm)  
DIMENSION IN MILLIMETER  
SYMBOLS  
UNIT  
MIN  
MAX  
A
0.90  
1.45  
A1  
A2  
B
0.00  
0.90  
0.30  
2.80  
2.60  
1.50  
0.90  
1.80  
0.30  
0.15  
1.30  
0.50  
3.00  
3.00  
1.70  
1.00  
2.00  
0.60  
D
E
E1  
e
e1  
L
NoteFollowed From JEDEC MO-178-C.  
Carrier Dimensions  
Life Support Policy  
Fitipower’s products are not authorized for use as critical components in life support devices or other medical systems.  
FP6861C-1.0-DEC-2015  
16  

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