Si4788CY Datasheet

Si4788CY
Vishay Siliconix
5-A Controlled Slew Rate Load Switch with Level Shift
FEATURES
D
D
D
D
D
D
5-A Maximum Load
Switches Voltages 1.8- to 5.5-V
Ground Referenced Logic Inputs
1.8- to 5-V Logic Voltage Compatible
25-mW Maximum On-Resistance
Level-Shifted Gate Drive Means The Control (Logic)
Voltage Is Independent Of Power Voltage
D Slow Turn-On (Controlled Slew Rate)
Eliminates High Inrush Currents
D Low Power Consumption In Off State
D Active Pull-Down On Output When In Off State
D RoHS Compliant
Pb-free
Available
DESCRIPTION
The Si4788CY is a p-channel MOSFET with a logic interface.
The control input is compatible with all types of logic down to
1.8 V. The switch can be used to control voltages from 1.8 V
to 5.5 V, and the logic input can be a lower voltage than the
power. The switch also incorporates reduced switching speed
to reduce inrush when switching loads with a high value of
capacitance. The Si4788CY is packaged in an 8-pin SOIC
package and rated for the commercial temperature range of
0 to 85_C.
FUNCTIONAL BLOCK DIAGRAM AND PIN CONFIGURATION
S
IN
Document Number: 71100
S-50246—Rev. D, 21-Feb-05
D
Logic and
Gate Drive
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Si4788CY
Vishay Siliconix
ABSOLUTE MAXIMUM RATINGS
Voltage Referenced to GND
VS, VDa . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.3 V to 7.0 V
VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.3 V to 7.0 V
Power Dissipation (Continuous)a . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5 W
Pulsed Drain Current (IDM)b . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 A
Continuous P-Switch Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 A
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −55 to 150_C
Notes
a. Device mounted with all leads soldered to 1” x 1” FR4 with laminated
copper PC board.
b. Pulse width p300 ms, dc p2%.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation
of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING RANGE
VS, VD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.8 V to 5.5 V
Operating Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . −25 to 85_C
VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to 5.5 V
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −25 to 150_C
This device has a maximum recommended operating junction temperature of 85_C. This temperature limit is used for electrical specifications such as logic transition
voltages only and is not a reliability limit. The device can be used with junction temperatures up to 150_C if relaxed specifications can be tolerated, although limits for
these specifications may not be given. Performance curves can be used to give an indication of specifications at higher temperatures, but are not guaranteed.
THERMAL RESISTANCE RATINGS
Parameter
Maximum Junction-to-AmbientNO TAG
Maximum Junction-to-Foot (Drain)NO TAG
Symbol
Typical
Maximum
Steady State
RthJA
80
95
Steady State
RthJF
15
20
Unit
_C/W
Notes
a. Surface Mounted on 1” x 1” FR4 Board.
b. Junction-to-foot thermal impedance represents the effective thermal impedance of all heat carrying leads in parallel and is intended for use in conjunction with
the thermal impedance of the PC board pads to ambient (RthJA = RthJF + RthPCB-A). It can also be used to estimate chip temperature if power dissipation and
the lead temperature of a heat carrying (drain) lead is known.
SPECIFICATIONS
Limits
Parameter
On-Resistance
Pull-Down Resistance
Symbol
rDS(on)
Typc
Maxb
Room
23
29
VS = 3.3 V, ID = 1 A, VIN = H
Room
20
25
VS = 4.5 V, ID = 1 A, VIN = H
Room
16
20
Specific Test Conditions
Tempa
VS = 2.5 V, ID = 1 A, VIN = H
Minb
rPULL-DOWN
VS = 3.3 V to 5 V, VIN = L
Room
20
W
IS(off)
VS = 1.8 V to 5 V, VIN = L
Room
1.2
mA
Logic Input Voltage Low
VINL
0.6
VINH
Turn-On Delay
td(on)
Turn-Off Delay
td(off)
Rise Time
tRISE
Fall Time
tFALL
Maximum Turn-On Slew Rate
dv/dt
VS = 3.3 V to 5 V
Full
VS = 1.8 V to 3.3 V
Full
VS = 3.3 V to 5 V
Full
2.2
Full
1.5
VS = 1.8 V to 3.3 V
Room
VIN = 5 V
V, ILOAD = 1 A,
A CLOAD = 100 mF
F
Test Circuit 1
12
mW
Leakage Current
Input Voltage High
8
Unit
0.3
16
V
35
Room
20
40
Room
280
550
Room
920
1800
Room
20
ms
V/ms
Notes
a. Room = 25_C, Full = as determined by the operating temperature suffix.
b. The algebraic convention whereby the most negative value is a minimum and the most positive a maximum.
c. Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing.
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Document Number: 71100
S-50246—Rev. D, 21-Feb-05
Si4788CY
Vishay Siliconix
TIMING DIAGRAMS
VS
50%
50%
VIN
0V
VIN
90%
VD
VD
10%
td(on)
90%
10%
td(off)
tr
tf
TEST CIRCUIT 1
PIN CONFIGURATION
SO-8
VIN
1
8
TRUTH TABLE
GND
SOURCE
2
7
DRAIN
SOURCE
3
6
DRAIN
SOURCE
4
5
DRAIN
VIN
Switch
0
Off
1
On
Top View
Ordering Information: Si4788CY
Si4788CY-T1 (with Tape and Reel)
Si4788CY—E3 (Lead (Pb)-Free)
Si4788CY-T1—E3 (Lead (Pb)-Free with Tape
and Reel)
PIN DESCRIPTION
Document Number: 71100
S-50246—Rev. D, 21-Feb-05
Pin Number
Symbol
1
VIN
2, 3, 4
SOURCE
5, 6, 7
DRAIN
8
GND
Description
Input pin
Ground
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Si4788CY
Vishay Siliconix
TYPICAL CHARACTERISTICS (25_C UNLESS NOTED)
Input Voltage Trip Point vs. Temperature
Total Off-State Leakage Current
10.000
1.30
TJ = 25_C
1.25
I TOTAL ( mA)
VIN − Trip Point
1.000
VS = 5 V
1.20
1.15
0.100
TJ = 150_C
1.10
0.010
1.05
1.00
−50
−25
0
25
50
75
100
125
0.001
0
150
2
4
Temperature (_C)
On-Resistance vs. VIN Voltage
0.032
0.024
0.016
0.008
0.000
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
1.2
1.0
0.8
0.6
−50
5.5
−25
trise
tdon
100
125
150
400
600
Load Capacitance (mF)
800
3000
125
150
VS = 3.3 V
2000
VS = 5 V
VIN = 5 V
ID = 1 A
RLOAD = 5 W
200
( mS)
100
4000
t RISE
Time ( mS)
75
5000
10
4
50
VS = VIN
CLOAD = 100 mF
ID = 1 A
6000
tdoff
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Rise Time vs. Temperature
7000
tfall
1
0
0
TJ − Junction Temperature (_C)
Switching Time vs. Load Capacitance
1000
10
VS = 4.5 V
VIN = 4.5 V
ID = 1 A
VS(V)
10000
8
Normalized On-Resistance
vs. Junction Temperature
1.4
VS = VIN
ID = 1 A
r DS(on) − On-Resistance ( W )
Normalized
r DS(on) − On-Resistance ( W )
0.040
6
VS (V)
1000
1000
0
−50
VS = 5.0 V
−25
0
25
50
75
100
Temperature (_C)
Document Number: 71100
S-50246—Rev. D, 21-Feb-05
Si4788CY
Vishay Siliconix
TYPICAL CHARACTERISTICS (25_C UNLESS NOTED)
Turn-On Delay vs. Temperature
Fall Time vs. Temperature
100
1100
VS = 3.3 V
1000
VS = VIN
CLOAD = 100 mF
ID = 1 A
60
t fall ( m s)
t d(on) ( m s)
80
40
VS = 5.0 V
20
VS = VIN
CLOAD = 100 mF
ID = 1 A
900
800
700
0
VS = 5.0 V
VS = 3.3 V
600
−50
−25
0
25
50
75
100
125
150
−50
−25
0
25
Temperature (_C)
Turn-Off Delay vs. Temperature
VS = VIN
CLOAD = 100 mF
ID = 1 A
24
Power (W)
t d(off) ( m s)
125
150
80
VS = 3.3 V
VS = 5.0 V
60
40
20
8
0
0
−50
−25
0
25
50
75
100
125
150
0.001
Temperature (_C)
1
0.1
1
10
Duty Cycle = 0.5
0.2
Notes:
0.1
0.1
0.01
Square Wave Pulse Duration (sec)
Normalized Thermal Transient Impedance, Junction-to-Ambient
2
Normalized Effective Transient
Thermal Impedance
100
Single Pulse Power
100
16
75
Temperature (_C)
40
32
50
PDM
0.05
t1
t2
1. Duty Cycle, D =
t1
t2
2. Per Unit Base = RthJA = 80_C/W
0.02
3. TJM − TA = PDMZthJA(t)
Single Pulse
0.01
10−4
10−3
4. Surface Mounted
10−2
10−1
1
10
100
600
Square Wave Pulse Duration (sec)
Document Number: 71100
S-50246—Rev. D, 21-Feb-05
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Si4788CY
Vishay Siliconix
TYPICAL CHARACTERISTICS (25_C UNLESS NOTED)
Normalized Thermal Transient Impedance, Junction-to-Foot
Normalized Effective Transient
Thermal Impedance
2
1
Duty Cycle = 0.5
0.2
0.1
0.1
0.05
0.02
Single Pulse
0.01
10−4
10−3
10−2
10−1
Square Wave Pulse Duration (sec)
1
10
TYPICAL APPLICATIONS
The Si4788CY can be used to control a load up to 5-Amp
where the control logic voltage is different from the voltage of
the load being controlled, and/or the load has a large
capacitive component and inrush currents must be minimized
during switching.
The low RDS(on) of 20-mW typical makes the switch ideal for
applications such as power bus switching in notebook
computers and central office telecom equipment. For a load of
5 A, the voltage drop is only approximately 100 mV.
The control input is a CMOS compatible input with a minimum
high input voltage of 2.2 V with a power rail voltage of 5 V. It is
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therefore compatible with any CMOS logic voltage between
2.2 V and 5 V under these conditions with no extra
configuration required. With a 3.3-V power rail voltage the
minimum high input voltage is 1.5 V, making it compatible with
1.8-V logic.
The Si4788CY is designed to give a steady dv/dt on the output
during turn-on even with capacitive loads. The output rise time
is 280-ms typical with a 100-mF load, which corresponds to a
dv/dt of about 20 V/ms, or a capacitive inrush current of around
2-A max with a 100-mF load. Higher values of capacitance
result in a slower switching speed, therefore even with very
high values of capacitance, inrush should not be a problem.
Document Number: 71100
S-50246—Rev. D, 21-Feb-05
Si4788CY
Vishay Siliconix
Si4788CY
Device Bay
Si4788CY
Main Bus
Si4788CY
HDD
5V
3.3 V
DC/DC
Converter
Power
Management
FIGURE 1. Si4788CY Used To Control 5-V Bus With 3.3-V Logic Control
3.3 V
2.5 V
Si4788CY
DC/DC
Converter
Power
Management
Load
FIGURE 2. Si4788CY Used To Control 3.3-V Bus With 2.5-V or 3.3-V Logic
Power
Si4788CY
56 kW
“Live Plugged”
Load
Circuit provides delayed turn-on
of the Si4788CY in the Absence of
a Power_On signal.
56 kW
0.1 mF
FIGURE 3. Si4788CY Used As Inrush Limiter On Removable Card
Vishay Siliconix maintains worldwide manufacturing capability. Products may be manufactured at one of several qualified locations. Reliability data for Silicon Technology and
Package Reliability represent a composite of all qualified locations. For related documents such as package/tape drawings, part marking, and reliability data, see
http://www.vishay.com/ppg?71100.
Document Number: 71100
S-50246—Rev. D, 21-Feb-05
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Disclaimer
All product specifications and data are subject to change without notice.
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Document Number: 91000
Revision: 18-Jul-08
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