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PDF APW7101 Data sheet ( Hoja de datos )
| Número de pieza | APW7101 | |
| Descripción | Synchronous Buck Regulator | |
| Fabricantes | Anpec Electronics Coropration | |
| Logotipo |  |
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APW7101
1.5MHz, 600mA, Synchronous Buck Regulator
Features
General Description
• 600mA Output Current
• 2.5V to 5.5V Input Voltage Range
• 1.5MHz Constant Frequency Operation
• Low Dropout Operation at 100% Duty Cycle
• Synchronous Topology:
No Schottky Diode Required
• 0.6V Low Reference Voltage
• Shutdown Mode Supply Current Under 1µA
• Current Mode Operation for Excellent Line and
Load Transient Response
• Over-Temperature Protection
• Over Current Protection
• SOT-23-5 Package
• Lead Free and Green Devices Available
(RoHS Compliant)
The APW7101 is a high efficiency monolithic synchronous
buck regulator. APW 7101 operates with a constant
1.5MHz switching frequency and using the inductor cur-
rent as a controlled quantity in the current mode
architecture. The device is available in an adjustable ver-
sion and fixed output voltages of 1.5V and 1.8V. The 2.5V
to 5.5V input voltage range makes the APW7101 ideally
suited for single Li-Ion battery powered applications.
100% duty cycle provides low dropout operation, extend-
ing battery life in portable electrical devices. The internally
fixed 1.5MHz operating frequency allows the use of small
surface mount inductors and capacitors. The synchro-
nous switches included inside increase the efficiency and
eliminate the need for an external Schottky diode. Low
output voltages are easily supported with the 0.6V feed-
back reference voltage. The APW7101 is available in a
low profile SOT package for saving the printed circuit
board area.
Applications
• Cellular Telephones
• Personal Information Appliances
• Wireless and DSL Modems
• MP3 Players
• Digital Still Cameras
• Portable Instruments
Pin Configuration
Top View
RUN 1
GND 2
SW 3
5 VFB
4 VIN
APW7101 ADJ
Top View
RUN 1
GND 2
SW 3
5 VOUT
4 VIN
APW7101 1.5V/1.8V
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 - Jun., 2008
1
www.anpec.com.tw
1 page  
APW7101
Typical Operating Characteristics
www.DataSheet4U.com
0.615
Reference Voltage
0.610
0.605
VIN=5.5V
VIN=2.5V
0.600
0.595
0.590
0.585
-50 -25 0 25 50 75 100 125
Temperature (o C)
Oscillator Frequency
1800
1700
1600
1500
VIN=3.6V
1400
1300
1200
-50 -25
0 25 50 75 100 125
Temperature (o C)
Oscillator Frequency vs Supply Voltage
1800
TA=25o C
1700
1600
1500
1400
1300
1200
2
345
Supply Voltage (V)
6
RDS(ON) vs Temperature
700
VIN=2.7V
600 VIN=3.6V
VIN=4.2V
500
400
300
200
NMOS
100
PMOS
0
-50 -25 0 25 50 75 100 125
Temperature (o C)
Copyright © ANPEC Electronics Corp.
Rev. A.4 - Jun., 2008
5
www.anpec.com.tw
5 Page 
www.DataSheet4U.com
APW7101
Application Information (Cont.)
Output Capacitor Selection
The output voltage ripple is a significant parameter to
estimate the performance of a convertor. There are two
discrete components that affect the output voltage
ripple bigger or smaller. It is recommended to use the
criterion has mentioned above to choose a suitable
inductor. Then based on this known inductor current ripple
condition, the value and properties of output capacitor will
affect the output voltage ripple better or worse. The output
voltage ripple consists of two portions, one is the product
of ESR and inductor current ripple, the other portion is the
function of the inductor current ripple and the output
capacitance. Figure-3 shows the waveforms to explain
the part decided by the output capacitance.
0A ∆IL
0.5TS
∆VOUT1
I(COUT)
VOUT
∆VOUT
=
∆IL
⋅ ESL
+
TS
8 ⋅ C OUT
......( 8)
Thermal Consideration
APW7101 is a high efficiency switching converter, it means
less power loss transferred into heat. Due to the on re-
sistance difference between internal power PMOSFET
and NMOSFET, the power dissipation in the high convert-
ing ratio is greater than low converting ratio. The worst
case is in the dropout operation, the mainly conduction
loss dissipate on the internal power PMOSFET. The power
dissipation nearly defined as:
( ) [ ( )]PD = IOUT 2 RDS _ONP ⋅ D + RDS _ONN ⋅ 1− D ......(9)
APW7101 has internal over temperature protection. When
the junction temperature reaches 150 centigrade,
APW7101 will turn off both internal power PMOSFET and
NMOSFET. The estimation of the junction temperature,
T , defined as:
J
TJ = PD ⋅ θJA ......(10)
where the θJA is the thermal resistance of the package
utilized by APW7101.
Output Voltage Setting
Figure-3
Evaluate the ∆VOUT1 by the ideal of energy equalization.
According to the definition of Q,
Q
=
1
2
1
2
∆ IL
⋅
1
2
TS
=
C OUT
⋅ ∆ VOUT 1
......( 6 )
where TS is the inverse of switching frequency and the ∆IL
is the inductor current ripple. Move the COUT to the left side
to estimate the value of ∆VOUT1 as equation (7).
∆VOUT 1
=
∆IL ⋅ TS
8 ⋅ C OUT
......( 7)
As mentioned above, one part of output voltage ripple is
the product of the inductor current ripple and ESR of out-
put capacitor. The equation (8) explains the output volt-
age ripple estimation.
APW7101 has the adjustable version for output voltage
setting by the users. A suggestion of maximum value of
RF2 is 200kΩ to keep the minimum current that provides
enough noise rejection ability through the resistor divider.
The output voltage programmed by the equation:
VOUT
=
0.6
⋅
1 +
R F1
R F2
......( 11)
VOUT
APW7101
FB
RF1
RF2
Figure-4
Copyright © ANPEC Electronics Corp.
Rev. A.4 - Jun., 2008
11
www.anpec.com.tw
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet APW7101.PDF ] | |
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