FX5545G205
Vishay
Industry Smallest and Low Profile
8W 2.5A DC/DC Buck Converter
with High Output Density Power
FEATURES
• Fully integrated DC/DC converter
• High efficiency over large load range
• 100% duty cycle
• Power density - more than 300W/inch
3
• 1uA shutdown current
• 2.7V to 6V input range (1Li+ and 3-cell NiCd or NiMH cells)
• 1.5V to 3.6V output voltage
• Programmable PWM/PSM controls
• Low output ripple
• BGA/LGA construction
• Temperature range: - 40°C to + 85°C
• No external components needed
• Output power 8W
• Maximum current 2.5A
• Low profile
The DC/DC converter is a programmable topology
synchronized Buck converter for today’s continuous changing
portable electronic market. The DC/DC converter provides
flexibility of utilizing various battery configurations and
chemistries such as NiCd, NiMH, or Li+ with an input voltage
range of 2.7V to 6V. An additional flexibility is provided with
topology programmability to power multiple loads such as
power amplifiers, microcontrollers, or baseband logic IC’s.
For ultra-high efficiency, converters are designed to operate
in sychronous rectified PWM mode under full load while
transforming into externally controlled pulse-skipping mode
(PSM) under light load.
The DC/DC converter is available in 20-ports BGA package.
In order to satisfy the stringent ambient temperature
requirements, the DC/DC converter is designed to handle
the industrial temperature range of - 40°C to + 85°C.
APPLICATION
•
•
•
•
•
•
•
•
•
Cordless phones, PDAs and others
Supply voltage source for low-voltage chip sets
Portable computers
Battery back-up supplies
Cameras
Routers
Fiber optics
LANS
Image processing
ORDERING INFORMATION
FX
FUNCTION
SIZE
CIRCUIT IDENTIFIER
OUTPUT VOLTAGE-Example: 2.7V should be written as 2V7 as the V indicates the decimal point,
or ADJ for adjustable version - self selectable output voltage.
PACKAGING-B1 = 10pcs in bulk; B5 = 50pcs in bulk; T1 = 13” reel; T2 = 7” reel.
5545
G205
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26
For technical questions, contact FunctionPAK@vishay.com
For marketing questions, contact FunctionPAK.marketing@vishay.com
Document Number: 10113
Revision 25-Mar-03
FX5545G205
Vishay
STANDARD ELECTRICAL SPECIFICATIONS
PARAMETER
Input
Voltage Range
Quiescent Current
Soft Start Time
SD, PWM/PSM, SYNC
Logic High
Logic Low
Normal Mode
PSM Mode
Shutdowm Mode
Shutdown Time
Insulation
Test Voltage
Resistance
Leakage Current
Output
Power
Voltage
Voltage Tolerance
Temp. Coefficient
Ripple and Noise
General
Package Weight
Oscillator
Frequency
SYNC Range
Temperature
Operation
Storage
Operating Junction Temp.
Thermal Impedance
Note:
W
D
= Power Dissipated
UNIT
V
DC
A
ms
V
V
A
A
A
ms
V
AC
Ω
nA
W
V
DC
%
%/°C
mVpp
mVpp
gr.
KHz
F
SYNC
/F
OSC
°C
°C
°C
°C/WD*
1.2
- 40
- 55
T
j
θ
JA
150
82
400
1.5
+ 85
+ 125
CONDITION
MIN
2.7
PSM mode
T
SS
V
H
V
L
I
DD
I
DD
I
DD
T
SS
60Hz 60sec
V
ISO
= 500V
DC
V
ISO
= 500V
DC
2.4
0.8
750
250
1
5
750
1 x 10
11
5
8
1.5 to 3.6
at 25°C Ambient Temperature
DC to 20MHz
With 10µF output capacitor
-3
130
90
1.5
3
0.03
200
5
TYP
MAX
6
Rise Time
Fall Time
Rise Time (PWM mode): Vin = 6V; Vout = 3.3V; Iout = 2.5A
Fall Time (PWM mode): Vin = 6V; Vout = 3.3V; Iout = 2.5A
www.vishay.com
28
For technical questions, contact FunctionPAK@vishay.com
For marketing questions, contact FunctionPAK.marketing@vishay.com
Document Number: 10113
Revision 25-Mar-03
FX5545G205
Vishay
Vout Vs. Iout
For Vin = 3.6V; Vout = 2.5V
2.6
2.55
2.6
2.55
2.5
Iout = 0.5A
Iout = 1.5A
Iout = 2.5A
Vout Vs. Vin
Vout (V)
Vout (V)
2.5
2.45
2.4
2.35
2.3
0
0.5
1
1.5
2
2.5
3
2.45
2.4
2.35
2.3
0
1
2
3
4
5
6
7
Iout (A)
Vin (V)
∆
Temp. Vs. Iout
Above 25°C Ambient Temperature; For Vin = 6V
60
50
40
30
20
10
0
0
0.5
1
1.5
2
2.5
3
100
95
90
85
80
75
70
65
60
55
50
0
0.5
Efficiency Vs. Iout
For Vin = 3.6V; Vout = 2.5V
Efficiency (%)
∆
Temp (
°
C)
1
1.5
2
2.5
3
Iout (A)
Iout (A)
Vout Vs. Vin (PSM mode)
lout = 0.1A
3.4
3.38
3.36
3.34
3.32
3.3
3.28
3.26
3.24
3.22
3.2
3
4
5
Vin (V)
6
7
3.4
3.38
3.36
3.34
3.32
3.3
3.28
3.26
3.24
3.22
3.2
0
Vout Vs. lout (PSM mode)
Vin = 6V
Vout (V)
Vout (V)
0.05
0.1
Iout (A)
0.15
0.2
0.25
Efficiency Vs. Iout (PSM mode)
100
90
80
70
60
50
40
30
20
10
0
0
0.05
0.1
Iout (A)
0.15
Vin = 4V
Vin = 6V
Vout (V)
0.2
0.25
Document Number: 10113
Revision 25-Mar-03
For technical questions, contact FunctionPAK@vishay.com
For marketing questions, contact FunctionPAK.marketing@vishay.com
www.vishay.com
29
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