XRP7714ILB-0X18-F Exar Corporation, XRP7714ILB-0X18-F Datasheet - Page 27

• Manufacturer Part Number: XRP7714ILB-0X18-F
• Description: IC CTRLR PWM/LDO STP-DWN 40TQFN
• Manufacturer: Exar Corporation
• Series: -r

Specifications of XRP7714ILB-0X18-F

• Topology: Step-Down (Buck) Synchronous (4), Linear (LDO) (1)
• Function: Any Function
• Number Of Outputs: 5
• Frequency - Switching: 1.5MHz
• Voltage/current - Output 1: Controller
• Voltage/current - Output 2: Controller
• Voltage/current - Output 3: Controller
• W/led Driver: No
• W/supervisor: No
• W/sequencer: Yes
• Voltage - Supply: 4.75 V ~ 25 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: *
• Package / Case: *
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 1016-1699

Selecting MOSFETs with lower Rdson reduces conduction losses at the expense of increased
switching losses. Conduction losses are expressed by the two following equations.
High Side MOSFET Conducted Loss:
Low Side MOSFET Conducted Loss:
The MOSFET’s junction temperature can be estimated from:
This assumes that the switching loss is the same as the conduction loss.
thermal resistance from junction to ambient.
L
Refer to application note ANP-32 “Practical Layout Guidelines for Power
© 2011 Exar Corporation
Power MOSFETs Selection
AYOUT
G
UIDELINES
Q
Q
P
u
u
cond
a
a
T
P
d
d
cond
j
=
= 2
C
C
I
=
h
out
h
P
a
I
cond
a
2
out
27/29
n
n
⋅
R
2
R
n
n
⋅
dson
thja
e
e
R
l
l
dson
+
⋅
D
D

 

T
1
ambient
i
i
⋅
−
g
g
V
V
out
i
V
i
in
V
t
t
out
in
a
a
l
l

 

P
P
W
W
M
M
S
XR
S
t
t
Designs”.
e
e
R
p
p
thja
D
D
is the total MOSFET
o
o
w
w
n
n
X
X
C
C
R
R
o
o
n
P
n
P
Rev. 1.1.6
t
t
7
7
r
r
o
o
7
7
l
l
1
1
l
l
e
e
4
4
r
r