R5523N SERIES
USB HIGH-SIDE POWER SWITCH
NO.EA-168-180516
OUTLINE
The R5523N is a high-side MOSFET switch IC for Universal Serial Bus (USB) applications. Low ON Resistance
(Typ.130m) and low supply current (Typ.20A at active mode) are realized in this IC. An over-current limit
circuit, a thermal shutdown circuit, and an under voltage lockout (UVLO) circuit are built-in as protection circuits.
Further, a delay circuit for flag signal after detecting over-current, is embedded to prevent miss-operation of
error flag because of inrush current. The R5523N Series is ideal for applications of protection for USB power
supply. Since the package is small SOT-23-5, high density mounting on board is possible.
FEATURES
Built-in P-channel MOSFET Switch
· Supply Current ············································ Typ. 20A (at Active Mode)
Switch ON Resistance ································· Typ. 130m
Output Current ············································· Min. 500mA
Flag Delay Time ··········································· Typ. 10ms.
Package ····················································· SOT-23-5
Over- Current Limit / Short Circuit Protection
Built-in Under Voltage Lockout (UVLO) Function
Built-in Thermal Shutdown Protection
Built-in Soft-start Function
APPLICATIONS
USB Peripherals
Notebook PCs
SELECTION GUIDE
The logic of the enable pin for the ICs can be selected at the user’s request.
Product Name
R5523N001-TR-FE
Package
Quantity per Reel
Pb Free
Halogen Free
SOT-23-5
3,000 pcs
Yes
Yes
: Designation of the logic of the enable pin.
(A) "L" active
(B) "H" active
1
R5523N
NO.EA-168-180516
BLOCK DIAGRAM
IN
OUT
GATE
CONTROL
EN
CURRENT
LIMIT
FLAG
DELAY
UVLO
THERMAL
SHUTDOWN
GND
R5523N Block Diagram
PIN DESCRIPTION
5
4
(mark side)
1
2
3
R5523N (SOT-23-5) Pin Configuration
2
Pin No
Symbol
Pin Description
1
EN
Enable Pin
2
GND
Ground Pin
3
FLG
FLG pin (Open Drain Output)
4
VIN
Power Supply Pin
5
VOUT
Output Pin
FLG
R5523N
NO.EA-168-180516
ABSOLUTE MAXIMUM RATINGS
Symbol
Item
Rating
Unit
6.5
V
0.3 to VIN+0.3
V
VIN
Input Voltage
VEN
Enable Pin Input Voltage
VFLG
Flag Voltage
0.3 to 6.5
V
IFLG
Flag Current
14
mA
VOUT
Output Voltage
0.3 to VIN+0.3
V
IOUT
Output Current
PD
Power Dissipation(1) (SOT-23-5, JEDEC STD.51-7)
Tj
Tstg
Internal Limited
660
mW
Junction Temperature Range
40 to 125
C
Storage Temperature
55 to 125
C
ABSOLUTE MAXIMUM RATINGS
Electronic and mechanical stress momentarily exceeded absolute maximum ratings may cause the permanent
damages and may degrade the lifetime and safety for both device and system using the device in the field. The
functional operation at or over these absolute maximum ratings is not assured.
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Rating
Unit
VIN
Operating Input Voltage
2.2 to 5.5
V
Ta
Operating Temperature Range
−40 to 85
°C
RECOMMENDED OPERATING CONDITIONS
All of electronic equipment should be designed that the mounted semiconductor devices operate within the
recommended operating conditions. The semiconductor devices cannot operate normally over the recommended
operating conditions, even if when they are used over such conditions by momentary electronic noise or surge. And
the semiconductor devices may receive serious damage when they continue to operate over the recommended
operating conditions.
(2)
Refer to POWER DISSIPATION for detailed information.
3
R5523N
NO.EA-168-180516
ELECTRICAL CHARACTERISTICS
R5523N001A/B Electrical Characteristics
Symbol
Item
IDD1
Supply Current 1 (Enabled)
(Ta = 25C)
Conditions
Typ.
Max.
Unit
VOUT = OPEN (1)
20
45
μA
IDD2
Supply Current 2 (Disabled) VOUT = OPEN (2)
0.1
1.0
μA
RON
Switch On Resistance
VIN = 5V, IOUT = 500mA
130
180
m
ton
Output Turn-on Delay
VIN = 5V, RL = 60
1400
μs
toff
Output Turn-off Delay
VIN = 5V, RL = 60
5
μs
VUVLO
UVLO Threshold
VIN at increasing
1.9
V
VHYS
UVLO Hysteresis Range
VIN at decreasing
0.1
V
ITH
Current Limit Threshold
ILIM
Short Current Limit
VIN=5V,
5ms after VOUT = 0V(3)
Min.
1.6
1.0
1.5
A
0.5
0.75
1.3
A
5
10
20
ms
VIN = 5V,
tFD
Over Current Flag Delay
From Over Current to
FLG = "L"
TTS
IEN
(1)
Thermal Shutdown
Tj at increasing
135
C
Temperature Threshold
Tj at decreasing
120
C
Enable Pin Input Current
0.01
VEN1
Enable Pin Input Voltage 1
VEN at increasing
VEN2
Enable Pin Input Voltage 2
VEN at decreasing
ILO
Output Leakage Current
VLF
Flag "L" Output Voltage
ISINK = 1mA
IFOF
Flag Off Current
VFLG = 5.5V
2.0
4
μA
V
0.1
0.01
EN=”L”(R5523NxxxA)、EN=”H”(R5523NxxxB)
EN=”H”(R5523NxxxA)、EN=”L”(R5523NxxxB)
(3)
Refer to “Overcurrent Detection and Overcurrent limit” in THEORY OF OPERATION for details.
(2)
1.0
0.8
V
1.0
μA
0.4
V
1.0
μA
R5523N
NO.EA-168-180516
THEORY OF OPERATION
This explanation is based on the typical application.
There is a parasitic diode between source and drain of the switch transistor. (Refer to the block diagram.)
Because of this, in both cases of enable and disable, if the voltage of VOUT pin is higher than VIN pin,
current flows from VOUT to VIN.
In case that VOUT pin and GND is short, if over-current would continue, the temperature of the IC would
increase drastically. If the temperature of the IC is beyond 135°C, the switch transistor turns off and the
FLG pin level becomes "L". Then, when the temperature of the IC decreases equal or lower than 120°C,
the switch transistor turns on and FLG becomes "H". Unless the abnormal situation of VOUT pin is removed,
the switch transistor repeats on and off. Refer to the 24) Thermal Shutdown operation in the typical
characteristics.
Over-current level is set internally in the IC. There are three types of response against over-current: Under
the condition that VOUT pin is short or large capacity is loaded, if the IC is enabled, the IC becomes constant
current state. After the flag delay time passes, FLG becomes "L", that means over current state. Refer to
the 23) current limit transient response of typical characteristics. While the switch transistor is on, if VOUT
pin is short or large capacity is loaded, until the current limit circuit responds, large transient current flows.
After the transient current is beyond the over-current detector threshold and delay time of the flag passes,
FLG becomes "L", that means over current state. Refer to the 25), 26) over-current limit transient response
of typical characteristics. In the case that load current gradually increases, the IC is not into the constant
current state until the current is beyond over current limit. Once the level is beyond the over current
detector threshold, load current is limited into over current limit level. Note that load current continuously
flows until the load current is beyond the over-current detector threshold.
FLG pin is Nch Open drain output. If the over-current or over-temperature is detected, FLG becomes "L".
If over-current is detected, FLG becomes "L" after the flag delay time tFD passes. Therefore flag signal is
not out with inrush current.
UVLO circuit prevents that the switch transistor turns on until the input voltage is beyond 1.9V. UVLO
circuit can operate when the IC is enabled.
5
R5523N
NO.EA-168-180516
Timing Chart
R5523N001A
Output On time/ Output Off time
VEN
50%
tON
50%
90%
tOFF
10%
VOUT
FLG Output Delay Time
VEN
50%
tFD
VFLG
10%
R5523N001B
Output On time/ Output Off time
VEN
50%
tON
50%
tOFF
90%
10%
VOUT
FLG Output Delay Time
VEN
50%
tFD
VFLG
10%
6
R5523N
NO.EA-168-180516
Overcurrent Detection and Overcurrent Limit
ITH
(1)
ILIM
IOUT
(2)
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