SiP32401ADNP-T1GE4 Vishay/Siliconix, SiP32401ADNP-T1GE4 Datasheet - Page 9

• Manufacturer Part Number: SiP32401ADNP-T1GE4
• Description: Power Switch ICs - Power Distribution 2A 1.2V Slew Rate Ctrl Load Switch
• Manufacturer: Vishay/Siliconix

Specifications of SiP32401ADNP-T1GE4

• Product Category: Power Switch ICs - Power Distribution
• Rohs: yes
• On Resistance (max): 72 mOhms
• On Time (max): 3.8 ms
• Off Time (max): 0.001 ms
• Operating Supply Voltage: 1.1 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Package / Case: TDFN-4
• Maximum Power Dissipation: 324 mW
• Minimum Operating Temperature: - 40 C
• Switch Current (max): 2.4 A
• Part # Aliases: SIP32401ADNPGE4

PCB LAYOUT
DETAILED DESCRIPTION
SiP32401A and SiP32402A are advanced slew rate
controlled high side load switch consisted of a n-channel
power switch. When the device is enable the gate of the
power switch is turned on at a controlled rate to avoid
excessive in-rush current. Once fully on the gate to source
voltage of the power switch is biased at a constant level. The
design gives a flat on resistance throughout the operating
voltages. When the device is off, the reverse blocking
circuitry prevents current from flowing back to input if output
is raised higher than input. The reverse blocking mechanism
also works in case of no input applied. The SiP32402A also
integrates an output discharge switch which allows fast
output discharge.
APPLICATION INFORMATION
Input Capacitor
The SiP32401A and SiP32402A do not require an input
capacitor. To limit the voltage drop on the input supply
caused by transient inrush currents, an input bypass
capacitor is recommended. A 2.2 µF ceramic capacitor
placed as close to the V
Higher values capacitor can help to further reduce the
voltage drop. Ceramic capacitors are recommended for their
ability to withstand input current surge from low impedance
sources such as batteries in portable devices.
Output Capacitor
While these devices works without an output capacitor,
an 0.1 µF or larger capacitor across V
recommended to accommodate load transient condition. It
also help to prevent parasitic inductance forces V
GND when switching off. Output capacitor has minimal affect
on device’s turn on slew rate time. There is no requirement
on capacitor type and its ESR.
Enable
The EN pin is compatible with both TTL and CMOS logic
Document Number: 63705
S12-0663-Rev. B, 26-Mar-12
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
Figure 27 - PCB Layout for TDFN4 1.2 mm x 1.6 mm (type: FR4, size: 1" x 1", thickness: 0.062", copper thickness: 2 oz.)
IN
Top
and GND should be enough.
For technical support, please contact:
OUT
This document is subject to change without notice.
and GND is
OUT
below
[e-mail]
voltage levels.
Protection Against Reverse Voltage Condition
Both SiP32401A and SiP32402A contain reverse blocking
circuitry to protect the current from going to the input from the
output in case where the output voltage is higher than the
input voltage when the main switch is off. Reverse blocking
works for input voltage as low as 0 V.
Thermal Considerations
SiP32401A and SiP32402A are designed to maintain a
constant output load current. Due to physical limitations of
the layout and assembly of the device the maximum switch
current is 2.8 A, as stated in the Absolute Maximum Ratings
table. However, another limiting characteristic for the safe
operating load current is the thermal power dissipation of the
package. To obtain the highest power dissipation (and a
thermal resistance of 170 °C/W) the power pad of the device
should be connected to a heat sink on the printed circuit
board. Figure 23 shows a typical PCB layout. All copper
traces and vias for the IN and OUT pins should be sized
adequately to carry the maximum continuous current.
The maximum power dissipation in any application is
dependant
T
for the TDFN4 1.2 mm x 1.6 mm package, 
and the ambient temperature, T
expressed as:
P
It then follows that, assuming an ambient temperature of
70 °C, the maximum power dissipation will be limited to about
324 mW.
So long as the load current is below the 2.8 A limit, the
maximum continuous switch current becomes a function of
two things: the package power dissipation and the R
the ambient temperature.
J(max.)
(max.)
= 125 °C, the junction-to-ambient thermal resistance
=
T
on
J
(max.)
SiP32401A, SiP32402A
θ
J
the
-
A
-
T
maximum
A
Bottom
=
A
, which may be formulaically
125
Vishay Siliconix
170
-
junction
www.vishay.com/doc?91000
T
A
J-A
www.vishay.com
temperature,
= 170 °C/W,
DS(on)
at
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