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PDF APW7504 Data sheet ( Hoja de datos )
| Número de pieza | APW7504 | |
| Descripción | 1.5A Synchronous Buck Regulator | |
| Fabricantes | ANPEC | |
| Logotipo |  |
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APW7504/A
1.5MHz, 1.5A Synchronous Buck Regulator
Features
• 1.5A Output Current
• Wide 3V~5.5V Input Voltage
• Fixed 1.5MHz Switching Frequency
• Low Dropout Operating at 100% Duty Cycle
• 30µA Quiescent Current
• Synchronous Rectifier
• 0.6V Reference Voltage
• <0.5µA Input Current During Shutdown
• Short-Circuit Protection
• Over-Temperature Protection
• Available in TDFN2x2-6 Package
• Lead Free and Green Devices Available
(RoHS Compliant)
General Description
APW7504/A is a 1.5MHz high efficiency monolithic syn-
chronous buck regulator. Design with current mode
scheme, the APW7504/A is stable with ceramic output
capacitor. Input voltage from 3V to 5.5V makes the
APW7504/A ideally suited for single Li-Ion battery pow-
ered applications. 100% duty cycle provides low dropout
operation, extending battery life in portable electrical
devices. The internally fixed 1.5MHz operating frequency
allows the using of small surface mount inductors and
capacitors. The synchronous switches included inside
increase the efficiency and eliminate the need of an ex-
ternal Schottky diode.
The APW7504/A is available in TDFN2x2-6 package.
Applications
• HD STB
• BT Mouse
• PND Instrument
• Portable Instrument
Pin Configuration
APW7504
PS 1
RUN 2
VIN 3
6 FB
5 GND
4 SW
TDFN2x2-6
(Top View)
APW7504A
NC 1
RUN 2
VIN 3
6 FB
5 GND
4 SW
TDFN2x2-6
(Top View)
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and
advise customers to obtain the latest version of relevant information to verify before placing orders.
Copyright © ANPEC Electronics Corp.
Rev. A.4 - Jan., 2016
1
www.anpec.com.tw
1 page  
APW7504/A
Typical Operating Characteristics
Efficiency vs. Load Current
100
95
VIN = 5V, Automatic Mode
TA = 25oC
90
VOUT = 1.8V
85
80
75
70 VOUT = 1.2V
65
60
55
50
0.001
0.01
0.1
1
Load Current, IOUT (A)
10
Efficiency vs. Load Current
100
90 VOUT = 1.8V
80
70
VOUT = 1.2V
60
50
40
30
20
10
0
0.001
VIN = 5V, Force PWM Mode
TA = 25oC
0.01
0.1
1
Load Current, IOUT (A)
10
Quiescent Current vs.
Junction Temperature
45
VIN = 3.6 V, Automatic Mode
40
35
30
25
20
15
-50
-25 0 25 50 75 100
Junction Temperature(oC)
125
Efficiency vs. Load Current
100
95
VIN = 3.3V, Automatic Mode
TA = 25oC
90
VOUT = 1.8V
85
80
75
70 VOUT = 1.2V
65
60
55
50
0.001
0.01
0.1
1
Load Current, IOUT (A)
10
Efficiency vs. Load Current
100
90 VOUT = 1.8V
80
70
60 VOUT = 1.2V
50
40
30
20
10
0
0.001
VIN = 3.3V, Force PWM Mode
TA = 25oC
0.01
0.1
1
Load Current, IOUT (A)
10
0.606
0.605
Reference Voltage vs.
Junction Temperature
VIN = 3.6V
0.604
0.603
0.602
0.601
0.600
0.599
0.598
0.597
0.596
0.595
0.594
-50
-25 0 25 50 75 100
Junction Temperature (oC)
125
Copyright © ANPEC Electronics Corp.
Rev. A.4 - Jan., 2016
5
www.anpec.com.tw
5 Page 
APW7504/A
Application Information
Input Capacitor Selection
Because buck converters have a pulsating input current,
a low ESR input capacitor is required. This results in the
best input voltage filtering, minimizing the interference
with other circuits caused by high input voltage spikes.
Also, the input capacitor must be sufficiently large to sta-
bilize the input voltage during heavy load transients. For
good input voltage filtering, usually a 4.7µF input capaci-
tor is sufficient. It can be increased without any limit for
better input-voltage filtering. Ceramic capacitors show
better performance because of the low ESR value, and
they are less sensitive against voltage transients and
spikes compared to tantalum capacitors. Place the input
capacitor as close as possible to the input and GND pin of
the device for better performance.
shown in “Typical Application Circuits”. A suggestion of
maximum value of R2 is 200kΩ to keep the minimum
current that provides enough noise rejection ability through
the resistor divider. The output voltage can be calculated
as below:
VOUT
=
VREF
⋅
1 +
R1
R2
=
0.6
⋅
1 +
R1
R2
VOUT
FB
APW7504/A
GND
R1≤1MΩ
R2 ≤ 200kΩ
Inductor Selection
For high efficiencies, the inductor should have a low DC
resistance to minimize conduction losses. Especially at
high-switching frequencies the core material has a higher
impact on efficiency. When using small chip inductors,
the efficiency is reduced mainly due to higher inductor
core losses. This needs to be considered when select-
ing the appropriate inductor. The inductor value deter-
mines the inductor ripple current. The larger the inductor
value, the smaller the inductor ripple current and the lower
the conduction losses of the converter. Conversely, larger
inductor values cause a slower load transient response.
A reasonable starting point for setting ripple current, ∆IL,
is 40% of maximum output current. The recommended
inductor value can be calculated as below:
L
≥
VOUT 1−
VOUT
VIN
FSW ⋅ ∆IL
IL(MAX) = IOUT(MAX) + 1/2 x ∆IL
To avoid the saturation of the inductor, the inductor should
be rated at least for the maximum output current of the
converter plus the inductor ripple current.
Output Voltage Setting
In the adjustable version, the output voltage is set by a
resistive divider. The external resistive divider is con-
nected to the output, allowing remote voltage sensing as
Output Capacitor Selection
The current-mode control scheme of the APW7504/A al-
lows the use of tiny ceramic capacitors. The higher ca-
pacitor value provides the good load transients response.
Ceramic capacitors with low ESR values have the lowest
output voltage ripple and are recommended. If required,
tantalum capacitors may be used as well. The output
ripple is the sum of the voltages across the ESR and the
ideal output capacitor.
∆VOUT
≅
VOUT
⋅ 1−
VOUT
VIN
FSW ⋅ L
⋅ ESR +
1
8 ⋅ FSW ⋅ COUT
When choosing the input and output ceramic capacitors,
choose the X5R or X7R dielectric formulations. These
dielectrics have the best temperature and voltage char-
acteristics of all the ceramics for a given value and size.
VIN IIN
IP-FET
IL
CIN P-FET
SW
N-FET
IOUT VOUT
ESR
COUT
Copyright © ANPEC Electronics Corp.
Rev. A.4 - Jan., 2016
11
www.anpec.com.tw
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet APW7504.PDF ] | |
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