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SIP4280
Vishay Siliconix
Slew Rate Controlled Load Switch
FEATURES
D D D D D D D D D 1.8 V to 5.5 V Input Voltage range Very Low RDS(ON), typically 80 m (5 V) Slew rate limited turn-on time options SIP4280-1: 1 ms SIP4280-3: 100 ms Fast shutdown load discharge option Low quiescent current 4 kV ESD Rating 8 pin SC70JW package
APPLICATIONS
D D D D D D Cellular telephones Digital still cameras Personal digital assistants (PDA) Hot swap supplies Notebook computers Personal communication devices
DESCRIPTION
The SIP4280 is a P-channel MOSFET power switch designed for high-side load switching applications. The output pass transistor is a P-channel MOSFET transistor with typically 80 m RDS(ON). The SIP4280 is available in two different versions of turn-on times. The SIP4280-1 version has a slew rate limited turn-on time typically of 1 ms. The SIP4280-3 version has a slew rate limited turn-on time typically of 100 ms and additionally offers a shutdown load discharge circuit to rapidly turn off a load circuit when the switch is disabled. Both SIP4280 load switch versions operate with an input voltage ranging from 1.8 V to 5.5 V, making them ideal for both 3 V and 5 V applications. The SIP4280 also features an under-voltage lock out which turns the switch off when an input undervoltage condition exists. Input logic levels are TTL and 2.5 volt to 5.0 volt CMOS compatible. The quiescent supply current is very low, typically 2.5 mA. In shutdown mode, the supply current decreases to less than 1.0 mA. The SIP4280 is available in a 8 pin SC70JW package and is specified over -40 _C to 85 _C temperature range.
TYPICAL APPLICATION CIRCUIT
Document Number: 73476 S-52468--Rev. B, 28-Nov-05
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SIP4280
Vishay Siliconix
ABSOLUTE MAXIMUM RATINGS
Supply Input Voltage (VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 V to 6 V Enable Input Voltage (VON) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 V to 6 V Output Voltage (VOUT) . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 V to VIN +0.3 V Maximum Switch Current (IMAX) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.3 A Maximum Pulsed Current (IDM) . . . . . . . . . . . . . . . . . . . . VIN w 2.5 V ..... 6 A . . . . . . . . . . . . . . . . . . . . . VIN < 2.5 V ..... 3 A Junction Temperature (TJ) . . . . . . . . . . . . . . . . . . . . . . . . . . . -40 _C to 150 _C Thermal Resistance (qJA)a . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140 _C/W Power Dissipation (PD)b . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 714 mW Notes a. Device mounted with all leads soldered or welded to PC board. b. Derate 7.14 mW/_C above TA = 25 _C
RECOMMENDED OPERATING RANGE (ALL VOLTAGES REFERENCED TO GND = 0 V)
VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.8 V to 5.5 V Operating Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . -40 _C to 85 _C
SPECIFICATIONS
Test Conditions Unless Specified p Parameter SIP4280 All Versions
Operating Voltagec Undervoltage Lockout Undervoltage Lockout Hysteresis Quiescent Current Off Supply Current Off Switch Current VIN VUVLO VUVLO(hyh) IQ IQ(OFF) ISD(OFF) ON/OFF = active ON/OFF = inactive, OUT = open ON/OFF = inactive, VOUT = 0 VIN = 5 V, TA = 25 _C On-Resistance On Resistance RDS(on) VIN = 4.2 V, TA = 25 _C VIN = 3 V, TA = 25 _C VIN = 1.8 V, TA = 25 _C On-Resistance Temp-Coefficient ON/OFF Input Low Voltaged ON/OFF Input High Voltage ON/OFF Input Leakage TCRDS VIL VIH ISINK VIN = 2.7 V to 5.5 V VIN = 2.7 V to v 4.2 V VIN = u4.2 V to 5.5 V VON/OFF = 5.5 V VIN Falling 1.8 1.0 - - - - - - - - - - 2 2.4 - - 1.4 250 2.5 0.01 0.01 80 85 100 160 2800 - - - - 5.5 1.8 - 4 1 1 120 130 150 250 - 0.8 - - 1 V V mV mA mA mA m m m m ppm/_C V V V mA
Limits Mina Typb Maxa Units
Symbol
VIN = 5 V, TA = -40 _C to 85 _C
SIP4280-1 Version
Output Turn-On Delay Time Output Turn-On Rise Time Output Turn-Off Delay Time TD(ON) TON TD(OFF) VIN = 5 V, RLOAD = 10, TA = 25 _C VIN = 5 V, RLOAD = 10, TA = 25 _C VIN = 5 V, RLOAD = 10, TA = 25 _C - - - 20 1000 4 40 1500 10 ms ms ms
SIP4280-3 Version
Output Turn-On Delay Time Output Turn-On Rise Time Output Turn-Off Delay Time Output Pull-Down Resistance a. b. c. d. TD(ON) TON TD(OFF) RPD VIN = 5 V, RLOAD = 10, TA = 25 _C VIN = 5 V, RLOAD = 10, TA = 25 _C VIN = 5 V, RLOAD = 10, TA = 25 _C ON/OFF = inactive, TA = 25 _C - - - - 20 100 4 150 40 150 10 250 ms ms ms
The algebraic convention whereby the most negative value is a minimum and the most positive a maximum. Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing. Part requires minimum start-up of VIN w 2.0 to ensure operation down to 1.8 V. For VIN v 2.7 V see typical ON/OFF threshold curve.
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Document Number: 73476 S-52468--Rev. B, 28-Nov-05
SIP4280
Vishay Siliconix
PIN CONFIGURATION
PIN DESCRIPTION
Pin Number SC70JW-8
1,5,6,7,8 3 4 2
Pin Name
VIN ON/OFF GND OUT
Description
This pin is the P-channel MODFET source connection Logic high enables the IC; logic low disables the IC and reduces the quiescent current to 2.5 mA Ground connection This pin is the P-channel MOSFET drain connection.
SELECTION GUIDE
Part Number
SIP4280-1-T1-E3 SIP4280-3-T1-E3
Slew Rate (typ)
1 ms 100 ms
Active Pull Down
No Yes
Enable
Active High Active High
ORDERING INFORMATION
Part Number
SIP4280DR-1-T1-E3 SIP4280DR-3-T1-E3 Notes: XXX = Lot Code
Marking
L1XXX
Temperature Range
-40 _C to 85 _C 40
Package
SC70JW-8 SC70JW-8
L3XXX
Document Number: 73476 S-52468--Rev. B, 28-Nov-05
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SIP4280
Vishay Siliconix
TYPICAL CHARACTERISTICS (INTERNALLY REGULATED, 25_C UNLESS NOTED)
Quiescent Current vs. Temperature
4.0 3.5 Quiescent Current (mA) 3.0 2.5 IQ (mA) 2.0 1.5 1.0 0.5 0.0 -40 VIN = 3 V V=5V 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 -25 0 25 50 75 85 0 1 2 3 VIN (V) 4 5 6
Quiescent Current vs. Input Voltage
Temperature (_C)
RDS(ON) vs. Input Voltage
250 230 210 190 rDS(ON) (mW) 170 150 130 110 90 70 50 1.5 100 mA 80 70 60 -40 500 mA 2A 120 1A rDS(ON) (mW) 110 140 130
RDS(ON) vs. Temperature
V=3V V=5V 100 90
2.0
2.5
3.0
3.5 VIN (V)
4.0
4.5
5.0
5.5
-25
0
25
50
75
85
Temperature (_C)
ON/OFF Threshold vs. Input Voltage
2.2 2.0 1.8 ON/OFF Threshold (V) 1.6 1.4 1.2 VIH 1.0 0.8 0.6 0.4 1.5 VIL IoffSW (mA) 1.0 0.8 0.6 0.4 0.2 0.0 2.0 2.5 3.0 3.5 VIN (V) 4.0 4.5 5.0 5.5 -40 1.6 1.4 1.2
Off Switch Current vs. Temperature
-25
0
25
50
75
100 85
Temperature (_C)
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Document Number: 73476 S-52468--Rev. B, 28-Nov-05
SIP4280
Vishay Siliconix
TYPICAL WAVEFORMS
SIP4280-1 Turn-On (VIN = 3 V, RLOAD = 6 W) SIP4280-1 Turn-Off (VIN = 3 V, RLOAD = 6 W)
ON/OFF (5 V/div.) ON/OFF (5 V/div.)
VOUT (2 V/div.)
VOUT (2 V/div.) IIN (200 mA/div.) IIN (200 mA/div.) Time (500 ms/div) Time (5 ms/div)
SIP4280-1 Turn-On (VIN = 5 V, RLOAD = 10 W)
ON/OFF (5 V/div.)
SIP4280-1 Turn-Off (VIN = 5 V, RLOAD = 10 W)
ON/OFF (5 V/div.) VOUT (2 V/div.)
VOUT (2 V/div.) IIN (200 mA/div.) IIN (200 mA/div.) Time (500 ms/div) Time (5 ms/div)
Document Number: 73476 S-52468--Rev. B, 28-Nov-05
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SIP4280
Vishay Siliconix
TYPICAL WAVEFORMS
SIP4280-3 Turn-On (VIN = 3 V, RLOAD = 6 W) SIP4280-3 Turn-Off (VIN = 3 V, RLOAD = 6 W)
ON/OFF (5 V/div.) ON/OFF (5 V/div.)
VOUT (2 V/div.)
VOUT (2 V/div.) IIN (200 mA/div.)
IIN (200 mA/div.) Time (50 ms/div) Time (5 ms/div)
SIP4280-3 Turn-On (VIN = 5 V, RLOAD = 10 W)
ON/OFF (5 V/div.)
SIP4280-3 Turn-Off (VIN = 5 V, RLOAD = 10 W)
ON/OFF (5 V/div.) VOUT (2 V/div.)
VOUT (2 V/div.) IIN (200 mA/div.)
IIN (200 mA/div.) Time (50 ms/div) Time (5 ms/div)
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Document Number: 73476 S-52468--Rev. B, 28-Nov-05
SIP4280
Vishay Siliconix
BLOCK DIAGRAM
SIP4280-3 Version only SIP4280 Functional Block Diagramm
Document Number: 73476 S-52468--Rev. B, 28-Nov-05
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SIP4280
Vishay Siliconix
DETAILED DESCRIPTION
The SIP4280 is a P-channel MOSFET power switches designed for high-side slew rate controlled load-switching applications. During turn on, the current ramps linearly until it reaches the level required for the output load condition. This is achieved by first applying the threshold voltage on the gate of the MOSFET. Once at this level, the current begins to slew and the gate voltage is then linearly increased until the MOSFET becomes fully enhanced. Once fully enhanced, the gate is quickly increased to the full input voltage and RDS(ON) is minimized. The SIP4280-1 version has a moderate 1ms turn on slew rate feature, which reduces in-rush current when the MOSFET is turned on. This function allows the load switch to be implemented with a small input capacitor, or no input capacitor at all. The SIP4280-3 has in addition to the 100 ms minimized slew rate limited turn on function, a shutdown output discharge circuit to rapidly turn off a load when the load switch is disabled through the ON/OFF pin. Both versions of the SIP4280 operate with input voltages ranging from 1.8 V to 5.5 V. Also, both versions of this device have extremely low operating current, making them ideal for battery-powered applications. In cases where the input voltage drops below 1.8 V, the under voltage lockout function will prevent the P-channel MOSFET device from entering into the saturation region of operation by automatically shutting down SIP4280. The ON/OFF control pin is TTL compatible and will also function with 2.5 volt to 5 volt CMOS logic systems.
APPLICATION INFORMATION
Input Capacitor While a bypass capacitor on the input is not required, a 1 mF or larger capacitor for CIN is recommended in almost all ap- plications. The Bypass capacitor should be placed as phy- sically close as possible to the SIP4280 to be effective in minimizing transients on the input. Ceramic capacitors are recommended over tantalum because of their ability to withstand input current surges from low impedance sources such as batteries in portable devices. Output Capacitor A 0.1 mF capacitor or larger across VOUT and GND is recom- mended to insure proper slew operation. COUT may be increased without limit to accommodate any load transient condition with only minimal affect on the SIP4280 turn on slew rate time. There are no ESR or capacitor type requirement. Enable The ON/OFF pin is compatible with both TTL and CMOS logic voltage levels. Reverse Voltage Conditions and Protection The P-channel MOSFET pass transistor has an intrinsic diode that is reversed biased when the input voltage is greater than the output voltage. Should VOUT exceed VIN , this intrinsic diode will become forward biased and allow excessive current to flow into the IC thru the VOUT pin and potentially damage the IC device. Therefore extreme care should be taken to prevent VOUT from exceeding VIN. In conditions where VOUT exceeds VIN a Schottky diode in parallel with the internal intrinsic diode is recommended to protect the SIP4280.
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?73476.
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Document Number: 73476 S-52468--Rev. B, 28-Nov-05
Legal Disclaimer Notice
Vishay
Notice
Specifications of the products displayed herein are subject to change without notice. Vishay Intertechnology, Inc., or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies. Information contained herein is intended to provide a product description only. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Vishay's terms and conditions of sale for such products, Vishay assumes no liability whatsoever, and disclaims any express or implied warranty, relating to sale and/or use of Vishay products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right. The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications. Customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Vishay for any damages resulting from such improper use or sale.
Document Number: 91000 Revision: 08-Apr-05
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