AIC1521
Single High-Side Power Switch With Control
Function
Analog Integrations Corporation 4F, 9 Industry E. 9th Rd, Science-Based Industrial Park, Hsinchu, Taiwan DS-1521-00 012102
TEL: 886-3-5772500 FAX: 886-3-5772510 www.analog.com.tw
1
n FEATURES
•120mΩ (5V Input) High-Side MOSFET Switch.
l 500mA Continuous Load Current.
l 80µA Typical On-State Supply Current.
l 1µA Typical Off-State Supply Current.
l Current-Limit / Short Circuit Protection.
l Thermal Limiting Protection under Overcurrent
Condition.
l Undervoltage Lockout Ensures that Switch is off at
Start Up.
l Output can be Forced Higher than Input (Off-State).
l Slow Turn ON and Fast Turn OFF.
l Active-High or Active-Low Enable.
n APPLICATIONS
l Motherboard USB Management.
l USB Power Management.
l Hot Plug-In Power Supplies.
l Battery-Charger Circuit.
l Power Distribution Switch.
n TYPICAL APPLICATION
CIRCUIT
n DESCRIPTION
The AIC1521 is an integrated high-side power
switch for self-powered and bus-powered Universal
Serial Bus (USB) applications. The high-side
switch is a MOSFET with 120mΩ RDS(ON), which
meets USB voltage drop requirements for
maximum transmission wire length. The switch
ON/OFF is controlled by CTL pin.
Output current is typically limited to 1.0A, well
below the 5A safety requirement, and thermal
shutdown function shuts the switch off to prevent
damage under overcurrent conditions.
Guaranteed minimum output rise time limits
inrush current during hot plug-in, minimizing EMI
and preventing the voltage at upstream port from
dropping excessively.
33µF
5.0V
VCC OUTIN
GND
*
33
µ
F
D+
D-
GND
VBUS
0.01µF
*
33µF, 16V Tantalum, or
100µF, 10V Electrolytic
Bold line indicate high-current traces
0.1µF
Ferrite Bead
+
DATA
A
A
I
I
CC
1
1
5
5
22
1
1
-
-
0
0
+
CTL
USB High-Side Power Switch
AIC1521
2
n ORDERING INFORMATION
PIN CONFIGURATION
NC
NC
OUT
GND
IN
NC
NC
MSOP8
TOP VIEW
NC
NC
OUT
GND
IN
NC
NC
SO8
TOP VIEW
AIC
1521
-
X
C
X
XX
PACKING TYPE
TR: TAPE & REEL
TB: TUBE
BG: BAG (for SOT-89-5)
PACKAGING TYPE
O: MSOP
S: SO8
W: SOT-89-5
CONTROL POLARITY
0: Active Low
1: Active High
Example: AIC1521-0COTR
à Active Low Version, in MSOP
Package & Taping & Reel Packing
Type
1
3
4
28
6
5
7
1
3
4
28
6
5
7
n ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VIN).................................................……......………….......……........... 7.0V
Operating Temperature Range ......…………...........……………….…............... -40°C ~ 85°C
Storage Temperature Range ................………..................……….................. -65°C ~ 150°C
n ELECTRICAL CHARACTERISTICS (VIN= 5V, TA=25°C, unless otherwise
specified.)
PARAMETERS CONDITIONS MIN. TYP. MAX. UNIT
Supply Current Switch Off, OUT=Open
Switch On, OUT=Open 0.75
80 2
100 µA
Control Input Voltage VCTL =Logic “0”
VCTL =Logic “1”
2.4
0.8 V
Control Input Current VCTL =Logic “0”
VCTL =Logic “1” 0.01
0.01 1
1 µA
Output MOSFET Resistance IOUT = 500mA 120 180 mΩ
Output Turn-On Rise Delay RL = 10Ω 30 µS
Output Turn-On Rise Time RL = 10Ω 500 µS
Output Turn-Off Delay RL = 10Ω 0.2 10 µS
n ELECTRICAL CHARACTERISTICS (Continued)
AIC1521
3
PARAMETERS
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Output Turn-Off Fall Time RL = 10Ω 0.2 10 µS
Output Leakage Current 2 µA
Current Limit Threshold 0.6 1.0 1.25 A
Thermal Limit 110 °C
UVLO Threshold VIN Increasing
VIN Decreasing 2.8
2.6 V
n TYPICAL PERFORMANCE CHARACTERISTICS
3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5
60
65
70
75
80
85
90
Fig. 1 On-State Supply Current vs. Supply Voltage
Supply Current (µA)
Supply Voltage (V)
-
40 -20 020 40 60 80 100
65
70
75
80
85
Fig. 2 On-State Supply Current vs. Temperature
Supply Current (µA)
Temperature (
°
C)
3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5
8.0
8.5
9.5
10.0
10.5
12.0
Fig. 3 Off-State Supply Current vs. Supply Voltage
Supply Current (nA)
Supply Voltage (V)
9.0
-40
-20
0
20
40
60
80
100
0
2
4
6
8
10
12
14
16
18
20
Fig. 4 Off-State Supply Current vs. Temperature
Supply Current (
nA)
Temperature (°C)
AIC1521
4
n TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
100
105
110
115
120
125
130
Fig. 5 Output On Resistance vs. Supply Voltage
Switch On Ristance (mΩ)
Supply Voltage (V)
Switch On Resistance (mΩ)
Temperature (
°
C)
-40
-20
0
20
40
60
80
100
80
90
100
110
120
130
140
150
Fig. 6
Output On Resistance vs. Temperature
UVLO Threshold Voltage (V)
Temperature (°C)
-40
-20
0
20
40
60
80
100
2.4
2.5
2.6
2.7
2.8
2.9
3.0
Falling
Rising
Fig. 7 UVLO Threshold Voltage vs. Temperature Temperature (°C)
-40
-20
0
20
40
60
80
100
0.80
0.85
0.90
0.95
1.00
1.05
1.10
1.15
1.20
Fig. 8 Current Limit Threshold vs. Temperature
Current Limit (A)
Output Rise Time (
µ
S)
Temperature (°C)
Fig. 9
Output Rise Time vs. temperature
-40
-20
0
20
40
60
80
100
350
400
450
500
550
Temperature (°C)
Fig. 10 Output Fall Time vs. Temperature
Output Fall Time (nS)
-40
-20
0
20
40
60
80
100
50
100
150
200
250
300
AIC1521
5
n TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Supply Voltage (V)
Fig. 11 CTL Threshold Voltage vs. Supply Voltage
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
1.0
1.2
1.4
1.6
1.8
2.0
2.2
CTL
R
ising
CTL Falling
Fig. 12 Turn On Characteristic (35Ω, Loading)
100µF
No Cap
IOUT, 200mA/DIV
220µF
CTL
Fig. 13 Turn On Rising Time (10Ω loading)
CTL
IOUT
VOUT
200mA/DIV
426µS
Fig. 14 Turn Off Falling Time (10Ω Loading)
CTL
IOUT
VOUT
107nS
200mA/DIV
Fig. 15 Turn On Characteristic (35Ω, 100µF Loading)
CTL
IOUT
VOUT
500mA/DIV
Fig. 16 Turn Off Falling Time (35Ω, 100µF Loading)
CTL
IOUT
VOUT
500mA/DIV
AIC1521
6
n TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
IOUT 500mA/DIV
VOUT
1A
1.2A
Fig. 17 Current Limit Threshold Fig. 18 Thermal Limiting Transient Response
Thermal limit (2Ω) loading)
IOUT 500mA/DIV
VOUT
Thermal Oscillation
IOUT 500mA/DIV
VOUT
Fig. 19 Short Circuit Testing Fig. 20 Short Circuit Response Time
IOUT 1A/DIV
Short
VOUT
AIC1521
7
n BLOCK DIAGRAM
GATE
NMOS
RS
Limit
Current
UVLO
Gate Control
Charge
Pump
Thermal
Protection
OSC.
GND OUT
IN
CTL
n PIN DESCRIPTIONS
PIN 1/4/6/8: NC:
PIN 2: CTL -TTL compatible control input. It
controls the power switch turn-
on/turn-off. Active High for
AIC1521-1 and active low for
AIC1521-0.
PIN 3: IN -Power supply input.
PIN 5: GND -Chip power ground.
PN 7: OUT - MOSFET switch output.
n APPLICATION INFORMATIONS
Current Limit
The current limit threshold is preset internally. It
protects the output MOSFET switches from
damage due to undesirable short circuit conditions
or excess inrush current often encountered during
hot plug-in. The AIC1521 allows minimum 500mA
continuous load current per Channel.
Thermal Protection
When the chip temperature exceeds 110°C, the
thermal protection function works.
Supply Filtering
A 0.1µF to 1µF bypass capacitor from IN to GND,
located near the device, is strongly recommended
to control supply transients. Without a bypass
capacitor, an output short may cause sufficient
ringing on the input (from supply lead inductance)
to damage internal control circuitry.
Transient Droop Requirements
USB support dynamic attachment (hot plug-in) of
peripherals. A current surge is caused by the input
capacitance of downstream device. Ferrite beads
are recommended in series with all power and
ground connector pins. Ferrite beads reduce EMI
and limit the inrush current during hot-attachment
by filtering high-frequency signals.
Short Circuit Transient
Bulk capacitance provides the short-term transient
current needed during a hot-attachment event.
With a 33uF, 16V tantalum or 100uF, 10V
electrolytic capacitor mounted close to
downstream connector should provide transient
drop protection.
Printed Circuit Layout
The power circuitry of USB printed circuit boards
requires a customized layout to maximize thermal
dissipation and to minimize voltage drop and EMI.
AIC1521
8
n PHYSICAL DIMENSIONS
l MSOP 8 (unit: mm)
SYMBOL MIN MAX
A0.76 0.97
A1 -- 0.20
B0.28 0.38
C0.13 0.23
D2.90 3.10
E2.90 3.10
e0.65
H4.80 5.00
L0.40 0.66
D
H
e
A
B
A1
C
E
L
l 8 LEAD PLASTIC SO (unit: mm)
SYMBOL MIN MAX
A1.35 1.75
A1 0.10 0.25
B0.33 0.51
C0.19 0.25
D4.80 5.00
E3.80 4.00
e1.27(TYP)
H5.80 6.20
L0.40 1.27
D
H
e
A
B
A1
C
E
L