SC704/SC705

SC704/SC705
500mA Low Vin, Very Low Ron
Load Switch
POWER MANAGEMENT
Features
Description
Input Voltage Range – 1.1V to 3.6V
500mA Continuous Output Current
Ultra-Low Ron – 90mΩ
Automatic Output Discharge Circuit
 Fast Turn-on Option With No Output Discharge
Circuit – SC704
 Extended Soft Start Option With Automatic Output Discharge Circuit – SC705
 Low Shutdown Quiescent Current
 Hardened ESD Protection 5kV
 Package: CSP – 0.76mm × 0.76mm, 0.4mm Pitch
The SC704/SC705 is a low input voltage, low Ron load
switch, designed for use in battery powered applications.
Integrated circuitry controls the switch to minimize resistance over a wide range of conditions.




The device provides controlled soft-start to limit inrush
current. The SC705 features an automatic discharge circuit
which discharges the output when the part is disabled.
The SC704/SC705 is offered in an ultra-small 4-bump
0.76mm×0.76mm Chip Scale Package (CSP) which enables
very small board area implementations. The SC704/SC705
has an operating temperature range of -40°C to +85°C.
Applications





Smart Phones
Tablet PCs
GPS devices
Battery powered equipment
Other portable Device
Automatic
Rising Time
Discharge
Device
Package
SC704
CSP
No
6.7µs(Typ.)
SC705
CSP
Yes
137µs(Typ.)
Typical Application Circuit
SU PPLY
VIN
LOAD
VOU T
1µF
1µF
SC704 / SC705
EN ABLE
Rev. 2.4
EN
GN D
© 2015 Semtech Corporation
SC704/SC705
Pin Configuration
Ordering Information
T O P V IE W
(B U M P S O N T H E B O T T O M )
A1
B1
A2
B2
Device
Package
SC704CSTRT
CSP 0.76mm×0.76mm 4-bump
SC705CSTRT
CSP 0.76mm×0.76mm 4-bump
SC704EVB
Evaluation Board
SC705EVB
Evaluation Board
Notes:
(1) Available in tape and reel only. A reel contains 5,000 devices.
(2) Lead-free packaging only. Device is WEEE and RoHS compliant,
and halogen free.
CSP 0.76x0.76, 4 Bump
Marking Information
SC704
SC705
Marking for the 0.76 x 0.76 mm CSP 4 Lead Package :
Marking for the 0.76 x 0.76 mm CSP 4 Lead Package :
O = Pin 1 ID
O = Pin 1 ID
nn = Part No. Code (Example: AN) - Reference Part No.
nn = Part No. Code (Example: AP) - Reference Part No.
SC704/SC705
Absolute Maximum Ratings
Recommended Operating Conditions
VIN to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +4.3V
Ambient Temperature Range (°C). . . . . . . . . -40 < TA < +85
EN to GND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3Vto+4.3V
VVIN (V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 to 3.6
OUT to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +VVIN
ESD Protection Level(1) (kV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
CIN Input Capacitance = 1uF
Thermal Information
Thermal Resistance, Junction to Ambient(2) (°C/W) . . . 160
Maximum Junction Temperature (°C). . . . . . . . . . . . . . . +125
Storage Temperature Range (°C). . . . . . . . . . . . . -65 to +150
Peak IR Reflow Temperature (10s to 30s) (°C) . . . . . . . . +260
Exceeding the above specifications may result in permanent damage to the device or device malfunction. Operation outside of the parameters
specified in the Electrical Characteristics section is not recommended.
NOTES:
(1) Tested according to JEDEC standard JESD22-A114-B.
(2) Assumes 3 x 4.5 inch, 4 layer FR4 PCB per JESD51 with 4 mil (100 micron) width traces connected to ball pads.
Electrical Characteristics
Unless otherwise noted VIN = 1.8V, CIN = 1μF, COUT = 1μF, VEN = VVIN, TA = -40°C to +85°C. Typical values are at TA = 25°C.
Parameter
Symbol
Input Supply Voltage Range
VIN
Output Voltage
VOUT
Maximum Output Current
IMAX
On Resistance (Ron)
Shutdown Current
Quiescent Current
RON
ISD
IQ(1)
Conditions
Min
Typ
1.1
Continuous current
Max
Units
3.6
V
VIN
V
500
mA
VIN =3.6V, IOUT = 200mA, V
�EN =1.5V
64
mΩ
VIN =2.5V, IOUT = 200mA, V
�EN =1.5V
72
mΩ
VIN =1.8V, IOUT = 200mA, V
�EN =1.5V
90
VIN =1.5V, IOUT = 200mA, V
�EN =1.5V
98
mΩ
VIN =1.2V, IOUT = 200mA, V
�EN =1.0V
126
mΩ
VEN =0V , VOUT open, TA = 25°C
0.1
μA
130
mΩ
VEN =0V , -40°C <= TA <= 85°C
2
μA
VIN =VEN =3.6V, VOUT open, -40°C <= TA <= 85°C
2
µA
Enable
EN Input High Threshold
VIH
ENABLE Input Low Threshold
VIL
1.1
V
0.3
V
SC704/SC705
Electrical Characteristics (continued)
Parameter
EN Input Pull-Down Resistance
Symbol
Conditions
REN
Min
Typ
Max
Units
5
MΩ
VIN =1.8V, IOUT = 200mA, V
�EN =1.5V
5
µs
VIN =3.6V, IOUT = 200mA, V
�EN =1.5V
1.5
µs
SC704
Turn-on Delay Time
TDT
Rising Time
TRT
VIN =1.8V, IOUT = 200mA, V
�EN =1.5V
6.7
µs
Falling Time
TFT
VIN =1.8V, IOUT = 500mA, V
�EN =1.5V
3.7
µs
VIN =1.8V, IOUT = 200mA, V
�EN =1.5V
100
µs
VIN =3.6V, IOUT = 200mA, V
�EN =1.5V
50
µs
SC705
Turn-on Delay Time
TDT
Rising Time
TRT
VIN =1.8V, IOUT = 200mA, V
�EN =1.5V
137
µs
Falling Time
TFT
VIN =1.8V, IOUT = 500mA, V
�EN =1.5V
7.2
µs
Output Pull-Down Resistance
RPD
VIN =1.8V
220
Ω
Notes:
(1) IQ current includes EN pull-down current.
SC704/SC705
Testingcondition:VIN=3.6V,Iout=0.5A,
Typical Characteristics
(SC704)
Testing condition: VIN=3.6V,
Shutdown
by VIN
Iout=0.5A,
C2=1uF,
CR mode, 25ɗ
C2=1uF,25ɗĭġCRMode,Chroma63030
3.6Vin, 0.5A
Start Up by VIN
3.6Vin, 0.5A
VIN
1V/div.
T5(Vin)
T6(Vout)
VIN
1V/div.
VOUT
1V/div.
Iout
VOUT
1V/div.
T5(Vi
T6(Vo
IOUT
0.2A/div.
IOUT
0.2A/div.
Iout
StartupbyEN(VINleadEN)
StartupbyEN(VINleadEN)
Time (2ms/div)
Time (5ms/div)
Testingcondition:VIN=1.8V,25Ԩ,
Testingcondition:VIN=1.8V,25Ԩ,
Start up by EN
Iout=0.2A,C1=C2=1uF,CRMode
Iout=0.2A,C1=C2=1uF,CRMode
Testingcondition:VIN=3.6V,25Ԩ,
Testingcondition:VIN=3.6V,25Ԩ,
Start up by EN
Iout=0.2A,C1=C2=1uF,CRMode
Iout=0.2A,C1=C2=1uF,CRMode
1.8Vin, 0A
VIN
1V/div.
3.6Vin,0A
T5(Vin)
T5(Vin)
T6(Vout)
T6(Vout)
VOUT
1V/div.
VIN
2V/div.
T
T5(Vin)
T6(VouT
VOUT
2V/div.
IIN
0.2A/div.
Iin Iin
EN EN
EN
2V/div.
Time (5us/div)
1.8Vin, 9 Ω
IIN
1A/div.
Iin
EN
EN
2V/div.
Time (5us/div)
Shutdown by EN
VIN
1V/div.
VOUT
0.4V/div.
IOUT
0.1A/div.
EN
1.5V/div.
Time (10us/div)
SC704/SC705
Start up by Vin
Typical Characteristics (SC705)
Testing condition: VIN=3.6V,
Iout=0.5A, Start
C2=1uF,
к
Up byCR
VINmode, 25к
Testing condition: VIN=3.6V,
Iout=0.5A,Shutdown
C2=1uF, by
CRVIN
mode, 25к
к
3.6Vin, 0.5A
3.6Vin, 0.5A
VIN
T5(Vin) 1V/div.
T6(Vout) VOUT
1V/div.
VIN
1V/div.
VOUT
1V/div.
Iout
IOUT
0.2A/div.
T5(Vin
T6(Vo
IOUT
0.2A/div.
Iout
StartupbyEN(SC705
StartupbyEN(SC705)
Time (5ms/div)
Time (10ms/div)
Testingcondition:VIN=1.8V,25Ԩ,
Testingcondition:VIN=1.8V,25Ԩ,
Start up by EN
RL=9Ÿ,C1=C2=1uF
RL=9Ÿ,C1=C2=1uF
Testingcondition:VIN=3.6V,25Ԩ,
Testingcondition:VIN=3.6V,25Ԩ,
Start up by EN
RL=18Ÿ,C1=C2=1uF
RL=18Ÿ,C1=C2=1uF
1.8Vin, 0.2A
3.6Vin,0.2A
T6
T6(Vou
T6(Vout)
T6(Vout)
Iin
Iin
Iout Iout
VOUT
0.5V/div.
IOUT
0.1A/div.
IIN
0.1A/div.
EN
2V/div.
EN
Time (50us/div)
1.8Vin,9 Ω
EN
VOUT
0.8V/div.
IIN
0.1A/div.
IOUT
0.1A/div.
EN
2V/div.
EN
Time (50us/div)
Shutdown by EN
1.8Vin,0A
VIN
1V/div.
VIN
0.4V/div.
VOUT
0.4V/div.
VOUT
0.4V/div.
IOUT
0.1A/div.
Iin Iin
Iout Io
Shutdown by EN
IOUT
0.1A/div.
EN
1.5V/div.
EN
1.5V/div.
Time (10us/div)
Time (.2mS/div)
SC704/SC705
Typical Characteristics, Cont.
EN Input Pull-Down Resistance vs. Temperature
On Resistance (mΩ)
EN Input Pull-Down Resistance (MΩ)
On Resistance vs. Temperature
Temperature (°C)
Temperature (°C)
Quiescent Current (uA)
Quiescent Current vs. Temperature
Temperature (°C)
SC704/SC705
Pin Descriptions
Pin #
Pin
Name
A1
VIN
Input supply voltage.
B1
EN
Enable input. Drive high to turn on the switch; drive low to turn off the switch. Floating is low. A 5MΩ internal resistor is connected to GND. In SC705 the EN input engages the automatic discharge function when the input is at logic
Low.
A2
OUT
Output voltage.
B2
GND
Ground.
Pin Function
Timing Diagram
Turn-on
Delay
Turn-off
Delay
VEN
VOUT
90%
10%
Fall
Time
Rise
Time
(Turn on time)=(Turn-on Delay)+(Rise Time)
Figure 1
SC704/SC705
Block Diagram
SC704
VOUT
VIN(1.1~3.6V)
C1
Slew Rate
Control
EN
C2
ILoad
(Up to 500mA)
SC704
GND
SC705
VOUT
VIN(1.1~3.6V)
C1
Slew Rate
Control
EN
C2
ILoad
(Up to 500mA)
SC705
GND
SC704/SC705
Application Information
Operation
The SC704/SC705 are integrated high-side PMOS load
switches that are designed to support up to 500mA continuous output current and operate from an input voltage
between 1.1V to 3.6V. The internal PMOS pass element has
a very low on resistance of 90mΩ (typical) at 1.8V. The
Enable pin incorporates a 5MΩ (typical) pull-down resistor. The SC704/SC705 also provides ultra-low low shutdown and quiescent current for extended battery life
during shutdown and light loading conditions.
The SC705 includes an automatic output discharge function which employs a 220Ω (typical) discharge path to
ground when the EN pin is disabled. The SC705 is also
designed for longer output rise time to decrease input
inrush current during power on.
Enable
time than SC704 so SC705 will significantly improve input
inrush current during power-on application conditions.
Board Layout Considerations
Input capacitor(C1) and output capacitor(C2) should be
placed as close to the SC704/SC705 as possible, and all
traces should be as short as possible and as wide as possible to minimize the case-to-ambient thermal impedance
and parasitic electrical effects.
Evaluation Board Information
Both T1 and T2 test points are Kelvin connections which
can be used to minimize R O. A jumper can be used
between VIN and EN on J1 to enable the part. To disable
the part the jumper can be connected between EN and
GND on J1.
The gate of the internal PMOS FET of SC704/SC705 is controlled by EN pin logic circuitry. If the EN pin is floating,
the internal switch will be turned off. In SC705 the EN pin
also controls the automatic discharge function.
Input Capacitor
In order to improve voltage drop, noise and bounce on
VIN pin, a filter/decoupling capacitor between VIN to GND
is recommended. A 1uf ceramic capacitor will be sufficient for most application conditions. However it should
be noted that suppressing bounce on input loop after EN
from high to low can require greater capacitor values
depending on the particular design being implemented.
During certain shutdown conditions, as in the case when
input power supply is abruptly removed, the input voltage
may tend to drop faster than the output voltage. In this
event a reverse current through the body diode of internal PMOS FET from VOUT to VIN can occur. To limit this
reverse current, Cin should be made greater than Cout to
sink current from the output.
Output Capacitor
A 1uF filter capacitor is added on the VOUT pin to suppress noise on the evaluation board. If a larger output
capacitance value is used, then input inrush current
should be considered since the power-on transient is
dependent on the output capacitor size. It should also be
noted that SC705 has longer turn-on delay time and rise
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SC704/SC705
Top Layer
DBN461!W!21/6!;!Npo!Opw!15!21;3:;44!3124!.!)Voujumfe*
Figure 2
Bottom Layer
DBN461!W!21/6!;!Npo!Opw!15!21;35;12!3124!.!)Voujumfe*
Figure 3
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SC704/SC705
Outline Drawing — CSP 0.76mm X 0.76mm, 4 Lead
12
SC704/SC705
Land Pattern — CSP 0.76mm X 0.76mm, 4 Lead
13
SC704/SC705
© Semtech 2015
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resulting from misuse, neglect improper installation, repair or improper handling or unusual physical or electrical stress
including, but not limited to, exposure to parameters beyond the specified maximum ratings or operation outside the
specified range.
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Contact Information
Semtech Corporation
Power Management Products Division
200 Flynn Road, Camarillo, CA 93012
Phone: (805) 498-2111 Fax: (805) 498-3804
www.semtech.com
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