Fairchild Semiconductor FDR8321L Datasheet
FDR8321L
P-Channel MOSFET With Gate Driver For Load Switch Application
General Description Features
V
This device is designed for configuration as a load
switch and is particularly suited for Power
Management in portable battery powered electronic
equipment. Designed to operate from 2.5V to 8V input
and supply up to 2.9A. The device features a small
N-Channel MOSFET (Q1) together with a large
P-Channel power MOSFET (Q2) in a single
SuperSOT
TM
-8 package.
= 0.2V @ VIN= 5V, IL= 2.9A. R
DROP
V
= 0.2V @ VIN= 2.5V, IL= 2A. R
DROP
V
Zener protection for ESD ruggedness (>6KV Human
ON/OFF
Body Model).
High density cell design for extremely low on-resistance.
August 2000
= 0.070 Ω
DS(ON)
= 0.105 Ω.
DS(ON)
SOT-23
SuperSOTTM-6
SuperSOT
TM
-8
SO-8
SOT-223
SOIC-16
IN
ON/OFF
EQUIVALENT CIRCUIT
V
DROP
+
-
V
SuperSOT -8
TM
1
pin
Absolute Maximum Ratings T
OUT,C1,CO
5
V
OUT,C1,CO
6
7
R
2
R
2
8
= 25°C unless otherwise noted
A
Q2
Q1
See Application Circuit
VIN,R1,Ci
4
R1,R2,C
3
1
C1,C
O
2
V
ON/OFF
1
Symbol Parameter FDR8321L Units
V
V
I
L
P
T
IN
ON/OFF
D
J,TSTG
Input Voltage Range 2.5 - 8 V
On/Off Voltage Range 1.5 - 8 V
Load Current @ V
= 0.2V - Continuous (Note 1) 2.9 A
DROP
- Pulsed
10
Maximum Power Dissipation (Note 2) 0.8 W
Operating and Storage Temperature Range -55 to 150 °C
THERMAL CHARACTERISTICS
R
JA
θ
R
θJC
Thermal Resistance, Junction-to-Ambient (Note 2) 156 °C/W
Thermal Resistance, Junction-to-Case (Note 2) 40 °C/W
OUT
©2000 Fairchild Semiconductor International FDR8321L Rev. C
Electrical Characteristics (T
= 25°C unless otherwise noted)
A
Symbol Parameter Conditions Min Typ Max Units
OFF CHARACTERISTICS
I
FL
Forward Leakage Current VIN = 5 V, V
= 0 V 1 µA
ON/OFF
ON CHARACTERISTICS (Note 3)
V
R
DROP
DS(ON)
Conduction Voltage Drop VIN = 5 V, V
= 2.5 V, V
V
IN
= 3.3 V, IL = 2.9 A 0.185 0.2 V
ON/OFF
= 3.3 V, IL= 2 A 0.18 0.2
ON/OFF
Q2 - Static Drain-Source On-Resistance VGS = -5 V, ID = -2.9 A 0.06 0.07
VGS = -2.5 V, ID = -2 A 0.09 0.105
I
L
Notes:
1. V
2. R
design while R
3. Pulse Test: Pulse Width <
Load Current V
=5V, V
=8V, V
IN
ON/OFF
is the sum of the junction-to-case and case-to-ambient thermal resistance where the case thermal reference is defined as the solder mounting surface of the drain pins. R
JA
θ
=0.2V, TA=25oC
DROP
is determined by the user's board design. R
CA
θ
300µs, Duty Cycle < 2.0%
typical =156oC/W when mounted on a minimum 0.0025 in2 pad on FR-4.
JA
θ
= 0.2 V, VIN = 5 V, V
DROP
= 0.2 V, VIN = 2.5 V, V
V
DROP
= 3.3 V 2.9 A
ON/OFF
= 3.3 V 2
ON/OFF
is guaranteed by
JC
θ
FDR8321L Load Switch Application
APPLICATION CIRCUIT
Q2
Ω
IN
R1
Ci
ON/OFF
Q1
External Component Recommendation
First select R2, 100 - 1kΩ, for Slew Rate control.
C1 ≤ 1000pF can be added in addition to R2 for further In-rush current control.
Then select R1 such that R1/R2 ratio maintains between 10 - 100. R1 is required to turn Q2 off.
For SPICE simulation, users can download a "FDR8321L.MOD" Spice model from Fairchild Web Site at
www.fairchildsemi.com
OUT
C1
R2
LOAD
Co
FDR8321L Rev.C
Typical Electrical Characteristics (T
= 25 OC unless otherwise noted )
A
0.4
T =125°C
J
0.3
T =25°C
0.2
DROP
V (V)
0.1
0
0 1 2 3 4 5
I (A)
L
J
V = 5V
IN
ON/OFF
V = 1.5 - 8V
PW =300us, D≤ 2%
Figure 1. Conduction Voltage Drop versus
Load Current at Input Voltage 5V.
0.4
0.3
ON
0.2
T =125°C
V ,(V)
IN
A
T =25°C
0.1
DROP
V ,(V) or R ,(Ohm)
0
1 2 3 4 5
A
I = 2.9A
L
ON/OFF
V = 1.5 - 8V
PW =300us, D≤ 2%
0.4
0.3
0.2
DROP
V (V)
0.1
0
0 1 2 3 4 5
T =125°C
J
I (A)
L
T =25°C
J
V = 2.5V
IN
V = 1.5 - 8V
ON/OFF
PW =300us, D≤ 2%
Figure 2. Conduction Voltage Drop versus
Load Current at Input Voltage 2.5V.
0.4
0.3
ON
0.2
T =125°C
V ,(V)
IN
A
T =25°C
0.1
DROP
V ,(V) or R ,(Ohm)
0
1 2 3 4 5
A
I = 2A
L
ON/OFF
V = 1.5 - 8V
PW =300us, D≤ 2%
Figure 3. Conduction Voltage Drop versus
input Voltage at Load Current 2.9A.
100
80
t
d(off)
60
Time (us)
40
20
t
d(on)
0
0 0.5 1 1.5 2 2.5 3
Figure 5. Switching Variation with R
at V
in
V = 5V R = 10KOhm
in
i
C = 10uF I = 1A
V = 3.3V C = 1uF
on/off
t
f
r
t
1
L
o
R2 (KOhm)
=5V and R1=10KΩΩ.
2
Figure 4. Conduction Voltage Drop versus
Input Voltage at Load Current 2A.
50
t
40
30
Time (us)
20
d(off)
t
f
10
0
0 0.5 1 1.5 2 2.5 3
Figure 6. Switching Variation with R
at Vin=2.5V and R1=10KΩΩ.
V = 2.5V R = 10KOhm
in
C = 10uF I = 1A
i
V = 3.3V C = 1uF
on/off
R2 (KOhm)
1
L
o
t r
t
d(on)
2
FDR8321L Rev.C