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AOZ1050PI 데이터시트 PDF




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부품번호 AOZ1050PI 기능
기능 2A Synchronous Buck Regulator
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AOZ1050PI 데이터시트, 핀배열, 회로
AOZ1050PI
EZBuck™ 2 A Synchronous Buck Regulator
General Description
The AOZ1050PI is a high efficiency, easy to use, 2 A
synchronous buck regulator. The AOZ1050PI works from
4.5 V to 18 V input voltage range, and provides up to 2 A
of continuous output current with an output voltage
adjustable down to 0.8 V.
The AOZ1050PI comes in an exposed pad SO-8
package and is rated over a -40 °C to +85 °C operating
ambient temperature range.
Features
z 4.5 V to 18 V operating input voltage range
z Synchronous Buck: 80 minternal high-side switch
and 50 minternal low-side switch (at 12 V)
z Up to 95 % efficiency
z External soft start
z Output voltage adjustable to 0.8 V
z 2 A continuous output current
z 500 kHz PWM operation
z Cycle-by-cycle current limit
z Pre-bias start-up
z Short-circuit protection
z Thermal shutdown
z Exposed pad SO-8 package
Applications
z Point of load DC/DC converters
z LCD TV
z Set top boxes
z DVD and Blu-ray players/recorders
z Cable modems
Typical Application
VIN
C1
10µF
RC
CC
CSS
VIN SS
EN
AOZ1050PI LX
COMP
FB
AGND
PGND
L1 4.7µH
R1
R2
VOUT
C2, C3
22µF
Rev. 1.0 June 2011
Figure 1. 3.3 V 2 A Synchronous Buck Regulator, Fs = 500 kHz
www.aosmd.com
Page 1 of 14
Free Datasheet http://www.datasheet4u.com/




AOZ1050PI pdf, 반도체, 판매, 대치품
AOZ1050PI
Electrical Characteristics
TA = 25 °C, VIN = VEN = 12 V, VOUT = 3.3 V unless otherwise specified(3)
Symbol
Parameter
Conditions
Min. Typ. Max.
VIN
VUVLO
IIN
IOFF
VFB
IFB
VEN
Supply Voltage
Input Under-Voltage Lockout
Threshold
Supply Current (Quiescent)
Shutdown Supply Current
Feedback Voltage
Load Regulation
Line Regulation
Feedback Voltage Input Current
EN Input Threshold
VHYS
EN Input Hysteresis
EN Leakage Current
SS Time
MODULATOR
fO
DMAX
TMIN
Frequency
Maximum Duty Cycle
Controllable Minimum On Time
Current Sense Transconductance
Error Amplifier Transconductance
VIN Rising
VIN Falling
IOUT = 0, VFB = 1.2 V, VEN > 1.2 V
VEN = 0 V
TA = 25 °C
Off Threshold
On Threshold
CSS = 16 nF
4.5 18
4.1
3.7
1.6 2.5
1 10
0.788 0.8 0.812
0.5
1
200
0.6
2
100
1
2
400 500 600
85
150
7
200
PROTECTION
ILIM Current Limit
Over-Temperature Shutdown Limit
OUTPUT STAGE
High-Side Switch On-Resistance
Low-Side Switch On-Resistance
TJ Rising
TJ Falling
VIN = 12 V
VIN = 5 V
VIN = 12 V
VIN = 5 V
2.5 3.5
150
100
80
120
50
60
Note:
3. Specification in BOLD indicate an ambient temperature range of -40 °C to +85 °C. These specifications are guaranteed by design.
Units
V
V
mA
µA
V
%
%
nA
V
mV
µA
ms
kHz
%
ns
A/ V
µA / V
A
°C
m
m
Rev. 1.0 June 2011
www.aosmd.com
Page 4 of 14
Free Datasheet http://www.datasheet4u.com/

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AOZ1050PI 전자부품, 판매, 대치품
AOZ1050PI
Compared with regulators using freewheeling Schottky
diodes, the AOZ1050PI uses a freewheeling NMOSFET
to realize synchronous rectification. This greatly
improves the converter efficiency and reduces power
loss in the low-side switch.
The AOZ1050PI uses a P-Channel MOSFET as the
high-side switch. This saves the bootstrap capacitor
normally seen in a circuit using an NMOS switch. It also
allows 100 % turn-on of the high-side switch to achieve
linear regulation mode of operation. The minimum
voltage drop from VIN to VO is the load current times DC
resistance of the MOSFET plus DC resistance of the
buck inductor. It can be calculated by equation below:
VO_MAX = VIN IO × RDS(ON)
where;
VO_MAX is the maximum output voltage,
VIN is the input voltage from 4.5 V to 18 V,
IO is the output current from 0 A to 2 A, and
RDS(ON) is the on resistance of the internal MOSFET.
Output Voltage Programming
Output voltage can be set by feeding back the output to
the FB pin using a resistor divider network as shown in
Figure 1. The resistor divider network includes R1 and
R2. Usually, a design is started by picking a fixed R2
value and calculating the required R1 with the equation
below:
VO
=
0.8 × ⎜⎛1 + R-----1-⎟⎞
R2
Some standard value of R1 and R2 for the most common
output voltages are listed in Table 1.
Table 1.
VO (V)
0.8
1.2
1.5
1.8
2.5
3.3
5.0
R1 (k)
1.0
4.99
10
12.7
21.5
31.1
52.3
R2 (k)
Open
10
11.5
10.2
10
10
10
The combination of R1 and R2 should be large enough to
avoid drawing excessive current from the output, which
will cause power loss.
Since the switch duty cycle can be as high as 100 %, the
maximum output voltage can be set as high as the input
voltage minus the voltage drop on the upper PMOS and
the inductor.
Protection Features
The AOZ1050PI has multiple protection features to
prevent system circuit damage under abnormal
conditions.
Over Current Protection (OCP)
The sensed inductor current signal is also used for over
current protection. Since the AOZ1050PI employs peak
current mode control, the COMP pin voltage is
proportional to the peak inductor current. The COMP pin
voltage is limited to be between 0.4 V and 2.5 V internally.
The peak inductor current is automatically limited
cycle-by-cycle.
When the output is shorted to ground under fault
conditions, the inductor current slowly decays during a
switching cycle because the output voltage is 0 V.
To prevent catastrophic failure, a secondary current limit
is designed inside the AOZ1050PI. The measured
inductor current is compared against a preset voltage
which represents the current limit, between 3.5 A and 5.0
A. When the output current is greater than the current
limit, the high side switch will be turned off. The converter
will initiate a soft start once the over-current condition is
resolved.
Power-On Reset (POR)
A power-on reset circuit monitors the input voltage. When
the input voltage exceeds 4.1 V, the converter starts
operation. When input voltage falls below 3.7 V, the
converter will be shut down.
Thermal Protection
An internal temperature sensor monitors the junction
temperature. The sensor shuts down the internal control
circuit and high side PMOS if the junction temperature
exceeds 150 ºC. The regulator will restart automatically
under the control of the soft-start circuit when the junction
temperature decreases to 100 ºC.
Rev. 1.0 June 2011
www.aosmd.com
Page 7 of 14
Free Datasheet http://www.datasheet4u.com/

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AOZ1050PI

2A Synchronous Buck Regulator

Alpha & Omega Semiconductors
Alpha & Omega Semiconductors

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