November 2015
© 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN3988 • Rev. 1.15
FAN3988 — USB / Charger and Over-Voltage Detection Device
FAN3988
USB/Charger and Over-Voltage Detection Device
Features
Charger/USB Detection Device
Charger/USB Device Detection Flag
Over-/Under-Voltage Detection Flag
VBUS Supply: 2.7 V to 20 V
CON of 1.5 pF
6-Lead MicroPak™ MLP Package
Applications
Mobile Phones
Handheld Devices
Description
The FAN3988 is a USB-connection-monitoring device
used to determine if a standard USB device or a battery-
charging device is connected.
The FAN3988 sets the FLAG1 pin to logic HIGH or
LOW as an indicator to the system controller that a
standard USB device or a charger is connected to the
USB port. The FAN3988 also monitors the VBUS for
over- or under-voltage conditions. The FLAG2 pin is set
LOW if VBUS is less than 3.3 V or greater than 6.0 V.
The FAN3988 is packaged in a very small 6-lead
MicroPak™ MLP package suitable for small board
space applications, such as mobile phones.
Ordering Information
Part Number
Operating
Temperature Range
Package
Packing
Method
Quantity
FAN3988IL6X
-40°C to +85°C
6-Lead MicroPak™ MLP Package
Reel
5000
FAN3988IL6X_F113(1)
Note:
1. Legacy product number; please order FAN3988IL6X for new designs.
Flag 1
Flag 2
D-
VBUS
GND
D+
Comparator
OVP
UVP
STD USB /
Charger
Detect
Logic
Logic
Figure 1. Block Diagram
© 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN3988 • Rev. 1.15 2
Pin Configuration
Figure 2. Pin Configuration (Top View)
Pin Definitions
Pin#
Name
Type
Description
1
Vbus
Input
Power input from charger, USB device, or handheld battery
2
D-
Input
USB data input
3
D+
Input
USB data input
4
Gnd
Input
Device ground
5
Flag2
Output
Over/under-voltage flag output
6
Flag1
Output
Charger/standard USB device detect flag
Truth Table
Connection State
VBUS (V)
D-
D+
FLAG1
FLAG2
STD USB Device(2)
0
Open
Open
LOW
LOW
STD USB Device
0
R to GND
R to GND
LOW
LOW
STD USB Device
5
R to GND
R to GND
LOW
HIGH
USB Charger
5
Short to D+
Short to D-
HIGH
HIGH
VBUS > 6 V
> 6
Short to D+
Short to D-
HIGH
LOW
VBUS < 3.3 V
< 3.3
Short to D+
Short to D-
HIGH
LOW
PC Data/Charger
5
Open
Open
LOW
HIGH
Note:
2. See Figure 7.
© 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN3988 • Rev. 1.15 3
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability.
The absolute maximum ratings are stress ratings only.
Symbol
Parameter
Min.
Max.
Unit
VBUS
DC Supply Voltage
-0.3
20.0
V
Reliability Information
Symbol
Parameter
Min.
Typ.
Max.
Unit
TJ
Junction Temperature
+150
°C
TSTG
Storage Temperature Range
-65
+150
°C
JA
Thermal Resistance, JEDEC Standard,
Multi-layer Test Boards, Still Air
41
°C/W
ESD Information
Symbol
Parameter
Max.
Unit
ESD
Electrostatic Discharge Information
Human Body Model, JESD22-A114
5
kV
Charged Device Model, JESD22-C101
2
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to Absolute Maximum Ratings.
Symbol
Parameter
Min.
Typ.
Max.
Unit
TA
Operating Temperature Range
-40
+85
°C
VBUS
Supply Voltage Range
2.7
5.0
20.0
V
© 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN3988 • Rev. 1.15 4
DC Electrical Characteristics
TA = 25°C and VBUS = 5.0 V, unless otherwise noted.
Symbol
Parameter
Condition
Min.
Typ.
Max.
Unit
Supply
VBUS
Supply Voltage Range
VBUS Range
2.7
5.0
20.0
V
IBUS
Quiescent Supply Current
VBUS = +5.0 V, D+ D- Shorted
1.2
2.0
mA
tSUPPLY
Power-Up Stabilization Time
VBUS = +5.0 V, D+ D- Shorted
10
ms
Input Characteristics
CD+
Input Capacitance
1.5
2.0
pF
CD-
Input Capacitance
1.5
2.0
pF
Ioff D+
Off Leakage Current
VBUS = 0 V or 5 V VIN on D+ = 5 V
1
µA
Ioff D-
Off Leakage Current
VBUS = 0 V or 5 V VIN on D- = 5 V
1
µA
Output Characteristics
OVDETECT
Over-Voltage Threshold
Detect
VBUS = +5.0 V, Flag2 = LOW
5.8
6.0
6.5
V
OVHYST
Over-Voltage Hysteresis
Voltage Sweep through Upper
and Lower Trip Points
100
mV
UVDETECT
Under-Voltage Threshold
Detect
VBUS = +5.0 V, Flag2 = LOW
3.0
3.3
3.6
V
UVHYST
Under-Voltage Hysteresis
Voltage Sweep through Upper
and Lower Trip Points
100
mV
VOH FLAG1/
FLAG2
Minimum HIGH Output
Voltage
VBUS = +5.0 V, IOH = -20 µA
2.4
2.6
V
VOL FLAG1/
FLAG2
Maximum LOW Output
Voltage
VBUS = +5.0 V, IOL = 20 µA
0.3
V
IOH FLAG1/
FLAG2
Minimum HIGH Output
Current
-20
µA
IOL FLAG1/
FLAG2
Maximum HIGH Output
Current
20
µA
D+/D-
Threshold
USB SDP
(Standard Downstream Port)
D+ = 3V; D- = 0V-3V or 3V-0V
D- = 3V; D+ = 0V-3V or 3V-0V
1.025
1.300
1.365
V
USB DCP
(Dedicated Charging Port)
D+/D- = 0V-3V, 3V-0V
1.450
V
toff
Flag2 HIGH to LOW
100 pF Load
10
ns
ton
Flag2 LOW to HIGH
100 pF Load
44
ns
© 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN3988 • Rev. 1.15 5
Typical Performance Characteristics
Figure 3. IBUS vs. vBUS (2.7 V-7.0 V) No Load
Figure 4. IBUS vs. vBUS (8.0V-21 V) No Load
Figure 5. No Fault on Flag 1, Skew=65 ns
Figure 6. PC Data Running D+/D- (Flag 1 and Flag 2 at Correct Levels)
VCC =2.7V-7.0V
0.40
0.50
0.60
0.70
0.80
0.90
1.00
2.70
2.90
3.10
3.30
3.50
3.70
3.90
4.10
4.30
4.50
4.70
4.90
5.10
5.30
5.50
5.70
5.90
6.10
6.30
6.50
6.70
6.90
VCC
m A
Icc
VCC =8.0V-21V
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
8
9
10
11
12
13
14
15
16
17
18
19
20
21
VCC
m A
ICC
© 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN3988 • Rev. 1.15 6
Application Information
Figure 7. Typical Application System with USB Transceiver
With USB Transceiver (Figure 7)
The FAN3988 sets the FLAG1 pin to logic HIGH or
LOW as an indicator to the system controller that a
standard USB device or a charger is connected to the
USB port. The FAN3988 also monitors the VBUS for
over- or under-voltage conditions. The FLAG2 pin is set
LOW if VBUS is less than 3.3 V or greater than 6.0 V.
In a standard USB configuration, there is a switch in the
USB transceiver that is always ON in the full-speed
mode. It is ON during the transition from full-speed
mode to high-speed mode and is turned off after
enumeration is complete.
In a condition where D+ and D- are shorted when a
charger is plugged into the USB port, the USB switch is
ON and pulled to VDD, which is about 3.3 V, making both
D+ and D- HIGH and flag1 set HIGH – indicating that a
charging device is connected to the port.
In a condition where D+ and D- are connected to a
standard USB device, the D+ is pulled to VDD and D- is
set LOW (due to the 15 kΩ pull-down in the USB
transceiver) and flag1 is LOW.
If D+ and D- are open (floating), D+ is pulled to VDD and
D- floats LOW, which makes flag1 LOW.
Vbus
D-
Std 15K pull-down on D-
input and 1.5K pull-up
on D+ by USB
transceiver.
Control
Flag 1
Vout
D+
1.5K
GND
Vdd
Logic
Battery
Comparator
OVP
UVP
USB
Gnd
D+
D-
Vbus
Flag 2
Rsense
USB Transceiver
Logic
STD USB
Device
(ie USB
Headphones)
Std USB/
Charger
Detect
15K
© 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN3988 • Rev. 1.15 7
Without USB Transceiver (Figure 8)
The FAN3988 sets the FLAG1 pin to logic HIGH or
LOW as an indicator to the system controller that a
standard USB device or a charger is connected to the
USB port. The FAN3988 also monitors the VBUS for
over- or under-voltage conditions. The FLAG2 pin is set
LOW if VBUS is less than 3.3 V or greater than 6.0 V.
In a condition where a USB transceiver is not
incorporated or there is a switch between the USB port
and the FAN3988, external resistors must be used to
set the correct input logic states on the D+ D- inputs. A
5 MΩ pull-down on the D- line and a 1 MΩ pull-up to
VDD (system supply) on the D+ line are recommended.
When a condition exists where a charger is plugged into
the USB port (D+ D- shorted), the voltage divider of
1 MΩ and 5 MΩ puts a voltage of 2.75 V on the D+ D-
inputs and flag1 is HIGH, indicating a charger is
connected to port.
In a condition where the USB port is connected to a
standard USB device, the D+ input is pulled up to VDD
(system supply) in parallel with the 1.5 kΩ on a USB
transceiver with a parallel R value of 1.497 kΩ. The D-
input is connected to a 15 kΩ pull-down by the USB
device and in parallel with 5 MΩ with a parallel R value
of 14.955 kΩ. This condition makes flag1 LOW.
If D+ and D- are open (floating), D+ is pulled to VDD
(system supply) and D- floats LOW, which makes
flag1 LOW.
Figure 8. Typical System Application without USB Transceiver
Flag 2
5M
Rsense
D-
Vbus
GND
Flag 1
Std USB/
Charger
Detect
1M
USB
Gnd
D+
D-
Vbus
D+
Control
Battery
Logic
Logic
Comparator
OVP
UVP
Vdd
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