Datasheet FDC6325L Datasheet (Fairchild Semiconductor)

FDC6325L
Integrated Load Switch

General Description Features

This device is particularly suited for compact power
management in portable electronic equipment where

2.5V to 8V input and 1.8A output current capability are
needed. This load switch integrates a small N-Channel
power MOSFET (Q1) which drives a large P-Channel
power MOSFET (Q2) in one tiny SuperSOTTM-6
package.

V

DROP

V

DROP

V

DROP

SuperSOTTM-6 package design using copper lead frame
for superior thermal and electrical capabilities.

=0.2V @ VIN=5V, IL=1.5A. R
=0.2V @ VIN=3.3V, IL=1.2A. R
=0.2V @ VIN=2.5V, IL=1A. R

August 1998

= 0.13Ω

(ON)

= 0.16Ω

(ON)

= 0.18Ω.

(ON)

SOT-23

SuperSOTTM-6

SuperSOTTM-8

SO-8

SOT-223

SOIC-16

IN

ON/OFF

EQUIVALENT CIRCUIT

V

DROP

+

-

Vout,C1

Q1

3

2

1

Vout,C1

R2

.325

1

pin

SuperSOT -6

Absolute Maximum Ratings T

TM

Vin,R1

4

ON/OFF

= 25°C unless otherwise noted

A

R1,C1

5

6

See Application Circuit

Q2

Symbol Parameter FDC6325L Units

V
V
I

L

IN

ON/OFF

Input Voltage Range 2.5 - 8 V
On/Off Voltage Range 1.5 - 8 V
Load Current - Continuous (Note 1) 1.8 A

- Pulsed (Note 1 & 3) 5

P

D

TJ,T
ESD Electrostatic Discharge Rating MIL-STD-883D Human Body

Maximum Power Dissipation (Note 2) 0.7 W
Operating and Storage Temperature Range -55 to 150 °C

STG

6 kV

Model (100pf/1500Ohm)

THERMAL CHARACTERISTICS

R

θJA

R

θJC

Thermal Resistance, Junction-to-Ambient (Note 2) 180 °C/W
Thermal Resistance, Junction-to-Case (Note 2) 60 °C/W

OUT

© 1998 Fairchild Semiconductor Corporation

FDC6325L Rev.D1

Electrical Characteristics (T

= 25°C unless otherwise noted)

A

Symbol Parameter Conditions Min Typ Max Units
OFF CHARACTERISTICS

I

FL

Forward Leakage Current VIN = 8 V, V

= 0 V 1 µA

ON/OFF

ON CHARACTERISTICS (Note 3)

V

DROP

R

(ON)

Conduction Voltage Drop

VIN = 5 V, V
VIN = 3.3 V, V
VIN = 2.5 V, V

= 3.3 V, IL = 1.5 A

ON/OFF

= 3.3 V, IL = 1.2 A

ON/OFF

= 3.3 V, IL = 1 A

ON/OFF

Q2 - Static On-Resistance VGS = -5 V, ID = -1.8 A

VGS = -3.3 V, ID = -1.6 A
VGS = -2.5 V, ID = -1.5 A

I

L

Notes:

1. VIN=8V, V

2. R
of the drain pins. R

3. Pulse Test: Pulse Width < 300µs, Duty Cycle < 2.0%.

Load Current

=8V, TA=25oC

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

JA

θ

is guaranteed by design while R

JC

θ

is determined by the user's board design.

CA

θ

V

= 0.13 V, VIN = 5 V, V

DROP

V

= 0.16 V, VIN = 3.3 V, V

DROP

V

= 0.2 V, VIN = 2.5V, V

DROP

ON/OFF

ON/OFF

ON/OFF

= 3.3 V

= 3.3 V

= 3.3 V

0.15 0.2 V

0.145 0.2

0.13 0.2

0.115 0.13

0.13 0.16

0.155 0.18
1 A
1
1

FDC6325L Load Switch Application

Ω

APPLICATION CIRCUIT

Q2

IN OUT

C1

LOAD

Co

ON/OFF

Ci

R1

Q1

R2

External Component Recommendation

For Co £ 1uF applications:
First select R2, 100 - 1kW, 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 "FDC6325L.MOD" Spice model from Fairchild Web Site
at www.fairchildsemi.com

FDC6325L Rev.D1

Typical Electrical Characteristics (T

= 25 OC unless otherwise noted )

A

0.5

0.4

0.3

DROP

0.2

V , (V)

0.1

0

0 1 2 3 4

T = 125°C

A

I ,(A)

L

T =25°C

A

V = 5V

IN
ON/OFF

V = 1.5 - 8V
PW =300us, D≤ 2%

Figure 1. Conduction Voltage Drop

Variation with Load Current.

0.5

T = 125°C

0.4

0.3

DROP

0.2

V , (V)

0.1

0

0 1 2 3 4

A

T =25°C

A

V =2.5V

IN

ON/OFF

V = 1.5 - 8V
PW =300us, D≤ 2%

I ,(A)

L

0.5

0.4

0.3

DROP

0.2

V , (V)

0.1

0

0 1 2 3 4

T = 125°C

A

I ,(A)

L

T =25°C

A

V =3.3V

IN
ON/OFF

V = 1.5 - 8V
PW =300us, D≤ 2%

Figure 2. Conduction Voltage Drop

Variation with Load Current.

0.6

0.5

0.4

ON

0.3

0.2

DROP

V ,(V) / R ,(Ohm)

0.1

0

1 2 3 4 5

V ,(V)

IN

T =125°C

A

T = 25°C

A

I = 1A

L

V = 1.5 - 8V

ON/OFF

PW =300us, D≤ 2%

Figure 3. Conduction Voltage Drop

Variation with Load Current.

Figure 4. On-Resistance Variation

with Input Voltage.

1

D = 0.5

0.5

R (t) = r(t) * R

JA

0.2

0.1

0.05

0.02

r(t), NORMALIZED EFFECTIVE

0.01

TRANSIENT THERMAL RESISTANCE

0.005

0.2

0.1

0.05

0.02

0.01
Single Pulse

θ

R = See Note 2

JA

θ

P(pk)

t

1

t

2

T - T = P * R (t)

J

Duty Cycle, D = t / t

JAA

θ

1

0.00001 0.0001 0.001 0.01 0.1 1 10 100 300
t , TIME (sec)

1

Figure 5. Transient Thermal Response Curve.

Thermal characterization performed on the conditions described in Note 2.
Transient thermal response will change depends on the circuit board design.

JA

θ

2

FDC6325L Rev.D1

SuperSOT-6 (FS PKG Code 31, 33)

[

]

1 : 1

Scale 1:1 on letter size paper

Dimens i ons sho w n below ar e in:

Part Weight per unit (gram): 0.0158

inches

millimeters

 1998 Fairchild Semiconductor Corporation

9/98 Rev A

TRADEMARKS

The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is
not intended to be an exhaustive list of all such trademarks.

ACEx™
CoolFET™
CROSSVOLT™
E2CMOS

TM

FACT™
FACT Quiet Series™

®

FAST
FASTr™
GTO™
HiSeC™

ISOPLANAR™
MICROWIRE™
POP™
PowerTrench™
QS™
Quite Series™
SuperSOT™-3
SuperSOT™-6
SuperSOT™-8
TinyLogic™

DISCLAIMER

FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER
NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD
DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT
OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT
RIGHTS, NOR THE RIGHTS OF OTHERS.

LIFE SUPPORT POLICY

FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROV AL OF FAIRCHILD SEMICONDUCTOR CORPORA TION.
As used herein:

1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant into
the body, or (b) support or sustain life, or (c) whose
failure to perform when properly used in accordance
with instructions for use provided in the labeling, can be
reasonably expected to result in significant injury to the
user.

2. A critical component is any component of a life
support device or system whose failure to perform can
be reasonably expected to cause the failure of the life
support device or system, or to affect its safety or

effectiveness.

PRODUCT STATUS DEFINITIONS
Definition of Terms

Datasheet Identification Product Status Definition

Advance Information

Preliminary

No Identification Needed

Obsolete

Formative or
In Design

First Production

Full Production

Not In Production

This datasheet contains the design specifications for
product development. Specifications may change in
any manner without notice.

This datasheet contains preliminary data, and
supplementary data will be published at a later date.
Fairchild Semiconductor reserves the right to make
changes at any time without notice in order to improve
design.

This datasheet contains final specifications. Fairchild
Semiconductor reserves the right to make changes at
any time without notice in order to improve design.

This datasheet contains specifications on a product
that has been discontinued by Fairchild semiconductor.
The data sheet is printed for reference information only.