ADVANCE INFORMATION AIC1522
3A POWER DISTRIBUTION SWI TCH
SPEC NO: DS-1522-P1 04/19/00
ANALOG INTEGRATIONS CORPORATION www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 1
! FEATURES
•60mΩ (5V Input) High-Side MOSFET Switch.
" 3A Continuous Load Current.
" 80µA Typical On-State Supply Current.
" 1µA Typical Off-State Supply Current.
" Short Circuit Protection.
" Thermal Shutdown Protection Under Overcurrent
Condition.
" Output Can Be Forced Higher Than Input (Off-State).
" Adjustable Turn-on Rise Time.
" Built-in 22Ω Discharge Resistor
" Active-High or Active-Low Enable.
! APPLICATIONS
" Power Distribution Switch.
" Notebook Load Switch.
" Hot Plug-In Power Supplies.
! TYPICAL APPLICATION CIRCUIT
DESCRIPTION
The AIC1522 is an integrated high-side power
switch for applications where heavy capacitive loads
and short cir cuits are lik ely to be encountered. T he
high-side switch is a MOSFET with 60mΩ RDS(ON).
and ON/OFF is controlled by CTL pin. Gate driver is
that provided by an internal charge pump des igned
to control the power switch r ise tim es and f all tim es
to minimize EMI and current surges during
switching.
These ICs also provide rise time adjustment
function to meet different application. Add external
capacitor from CR pin to GND to adjust the rise
time .
Output current is typically limited to 3.5A.W hen the
output load exc eeds the cur rent limit threshold or a
short is present, the AIC1522 limits the current into a
safe level by switching into a constant current mode
and thermal shutdown function shuts the switch off
to prevent damage under overcurrent conditions.
GND
IN
CTL
OUT
CR
Power Distribution Switch
! ORDERING INFORMATION
ORDER NUMBER
AIC1522-0CS
AIC1522-1CS
(SO8)
PIN CONFIGURATION
AIC1522-XCX
PACKAGING TYPE
S: SO8
W: SOT-89-5
CONTROL POLARITY
0: Active Low
1: Active High
FRO NT VI EW
1: VIN
2: GND
3: VOUT
4: CR
5: CTL
123
54
OUT
CR
NC
OUT
VIN
CTL
VIN
GND 1
3
4
28
6
5
7
FRO NT VI EW
AIC1522-0CW
AIC1522-1CW
(SOT-89-5)
AIC1522
3A POWER DISTRIBUTION SWI TCH
SPEC NO: DS-1522-P1 04/19/00
ANALOG INTEGRATIONS CORPORATION www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 2
! ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VIN).......................................................………….......……........... 7.0V
Operating Temperature Range ......………..............…………….…............... -40°C ~ 85°C
Storage Temperature Range ....................................……….................. -65°C ~ 150°C
Thermal Resistance (θJA) SOT-89-5……….……………..…………………………150°C
SO8………..………….………..…………………………190°C
! ELECTRICAL CHARAC TERISTICS (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
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 60 mΩ
Output Turn-On Rise Delay RL = 10Ω each Output 100
µS
Output Turn-On Rise Time CR = Open, RL = 10Ω 500
µS
Output Leakage Current 5
µA
Current Limit Threshold 3.0 A
Thermal Limit 140
°C
Discharging Resistor 22
Ω
AIC1522
3A POWER DISTRIBUTION SWI TCH
SPEC NO: DS-1522-P1 04/19/00
ANALOG INTEGRATIONS CORPORATION www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 3
! BLOCK DIAGRAM
DISCHARGE
NMOS
GATE
NMOS
RS
Rd ON 60 h
Control
Gate
CTL
CR
Charge
Pump
OSC.
Protection
Thermal
Limit
Current
Bandgap
Reference
OUT
IN
GND
AIC1522
3A POWER DISTRIBUTION SWI TCH
SPEC NO: DS-1522-P1 04/19/00
ANALOG INTEGRATIONS CORPORATION www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 4
! PIN DESCRIPTION
PIN 1: IN - Power supply input.
PIN 2: GND - Chip power ground.
PIN 3: OUT - MOSFET switch output.
PIN 4: CR - Rise time adjustment pin. Connect a
capacitor from this pin to ground.
PIN 5: CTL - TTL compatible control input. It
controls the power switch turn-on /
turn-off. Active High for AIC1522-1
and active low for AIC1522-0.
! 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 AIC1522 allows 3A continuous load current per
Channel.
" Thermal Protection
When the chip temperature exceeds 140°C, the thermal
protection function works.
" Supply Filtering
A 0.1uF to 1uF 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.
" Generic Hot – Pl ug Application Requirement s
In many applications it may be necessary to remove
modules or PC boards while the main unit is still
operating. These are considered hot – plug applications.
Such implementations require the control of current
surges seen by the main power supply being inserted.
The most effective way to control these surges is to limit
and slowly ram p the current and voltage while a power
supply normally turns on. The AIC1522 can be used to
provide a soft – start protection while AIC1522 being
hot – plugged into a powered system.
" 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 electroly tic capacitor
mounted close to downstream connector should provide
transient drop protection.
" Printed Circui t Layout
The power circuitry of printed circuit boards requires a
customized layout to maximize thermal dissipation and
to minimize voltage drop and EMI.
AIC1522
3A POWER DISTRIBTION SWI TCH
SPEC NO: DS-1522-P1 04/19/00
ANALOG INTEGRATIONS CORPORATION www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 5
PHYSICAL DIMENSIONS
" 8 LEAD PLASTIC SO (unit: mm)
SYMBOL MIN MAX
A 1.35 1.75
A1 0.10 0.25
B 0.33 0.51
C 0.19 0.25
D 4.80 5.00
E 3.80 4.00
e 1.27(TYP)
H 5.80 6.20
L 0.40 1.27
D
H
e
A
B
A1
C
E
L
" SOT-89-5 (unit: mm)
SYMBOL MIN MAX
A 1.40 1.60
b 0.32 0.52
b1 1.40 1.80
C 0.30 0.50
D 4.40 4.60
E 2.40 2.60
e 300 (TYP)
e1 1.50 (TYP)
HE 4.20 5.00
b
e1
LE
HE
e
E
A
C
D
b1
b
LE 0.80 ---
