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Z1051PI Schematic ( PDF Datasheet ) - Alpha & Omega Semiconductors

Teilenummer Z1051PI
Beschreibung AOZ1051PI
Hersteller Alpha & Omega Semiconductors
Logo Alpha & Omega Semiconductors Logo 




Gesamt 14 Seiten
Z1051PI Datasheet, Funktion
AOZ1051PI
EZBuck™ 3 A Synchronous Buck Regulator
General Description
The AOZ1051PI is a high efficiency, easy to use, 3 A
synchronous buck regulator. The AOZ1051PI works from
4.5 V to 18 V input voltage range, and provides up to 3 A
of continuous output current with an output voltage
adjustable down to 0.8 V.
The AOZ1051PI 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: 70 minternal high-side switch
and 40 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 3 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
AOZ1051PI LX
COMP
FB
AGND
PGND
L1 4.7µH
R1
R2
VOUT
C2, C3
22µF
Rev. 1.0 June 2011
Figure 1. 3.3 V 3 A Synchronous Buck Regulator, Fs = 500 kHz
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Z1051PI Datasheet, Funktion
Efficiency
AOZ1051PI
100
95
90
85
80
75
70
65
60
0.3 0.6
Efficiency (VIN = 12V) vs. Load Current
5V OUTPUT
3.3V OUTPUT
1.8V OUTPUT
1.2V OUTPUT
0.9 1.2 1.5 1.8 2.1 2.4 2.7
Load Current (A)
3.0
Detailed Description
The AOZ1051PI is a current-mode step down regulator
with an integrated high-side PMOS switch and a low-side
NMOS switch. The AOZ1051PI operates from a 4.5 V to
18 V input voltage range and supplies up to 3 A of load
current. Features include enable control, power-on reset,
input under voltage lockout, output over voltage
protection, external soft-start and thermal shut down.
The AOZ1051PI is available in an exposed pad SO-8
package.
Enable and Soft Start
The AOZ1051PI has an external soft start feature to limit
in-rush current and ensure the output voltage ramps up
smoothly to regulation voltage. The soft start process
begins when the input voltage rises to 4.1 V and voltage
on the EN pin is HIGH. In the soft start process, the
FB voltage is ramped to follow the voltage of the soft start
pin until it reaches 0.8 V. The voltage of the soft-start pin
is charged by an internal 5 µA current.
The EN pin of the AOZ1051PI is active high. Connect the
EN pin to VIN if the enable function is not used. Pulling
EN to ground will disable the AOZ1051PI. Do not leave
EN open. The voltage on the EN pin must be above 2 V
to enable the AOZ1051PI. When the EN pin voltage falls
below 0.6 V, the AOZ1051PI is disabled.
Steady-State Operation
Under heavy load steady-state conditions, the converter
operates in fixed frequency and Continuous-Conduction
Mode (CCM).
The AOZ1051PI integrates an internal P-MOSFET as the
high-side switch. Inductor current is sensed by amplifying
the voltage drop across the drain to source of the high
side power MOSFET. Output voltage is divided down by
the external voltage divider at the FB pin. The difference
of the FB pin voltage and reference voltage is amplified
by the internal transconductance error amplifier. The
error voltage, which shows on the COMP pin, is
compared against the current signal, which is the sum of
inductor current signal and ramp compensation signal, at
the PWM comparator input. If the current signal is less
than the error voltage, the internal high-side switch is on.
The inductor current flows from the input through the
inductor to the output. When the current signal exceeds
the error voltage, the high-side switch is off. The inductor
current is freewheeling through the internal low-side
N-MOSFET switch to output. The internal adaptive FET
driver guarantees no turn on overlap of both the
high-side and the low-side switch.
Rev. 1.0 June 2011
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6 Page









Z1051PI pdf, datenblatt
Package Dimensions, SO-8 EP1
D0
E2 E3
E1 E
AOZ1051PI
Gauge plane
0.2500
C
L
L1
7 (4x)
D1
D
Note 5
A2 A
L1'
θ
Be
A1
Dimensions in millimeters
Symbols Min. Nom. Max.
RECOMMENDED LAND PATTERN
A 1.40 1.55 1.70
A1 0.00 0.05 0.10
3.70
A2 1.40 1.50 1.60
B 0.31 0.406 0.51
C 0.17 — 0.25
2.20 D 4.80 4.96 5.00
D0 3.20 3.40 3.60
5.74 D1 3.10 3.30 3.50
2.71 E 5.80 6.00 6.20
e — 1.27 —
2.87 E1 3.80 3.90 4.00
E2 2.21 2.41 2.61
E3 0.40 REF
L 0.40 0.95 1.27
0.80 y — — 0.10
1.27
0.635
UNIT: mm
θ
| L1–L1' |
0°
3° 8°
0.04 0.12
Notes:
L1 1.04 REF
1. Package body sizes exclude mold flash and gate burrs.
2. Dimension L is measured in gauge plane.
3. Tolerance 0.10mm unless otherwise specified.
4. Controlling dimension is millimeter, converted inch dimensions are not necessarily exact.
5. Die pad exposure size is according to lead frame design.
6. Followed from JEDEC MS-012
Dimensions in inches
Symbols
A
A1
A2
B
C
D
D0
D1
E
e
E1
E2
E3
L
y
θ
| L1–L1' |
L1
Min. Nom. Max.
0.055 0.061 0.067
0.000 0.002 0.004
0.055 0.059 0.063
0.012 0.016 0.020
0.007 — 0.010
0.189 0.195 0.197
0.126 0.134 0.142
0.122 0.130 0.138
0.228 0.236 0.244
— 0.050 —
0.150 0.153 0.157
0.087 0.095 0.103
0.016 REF
0.016 0.037 0.050
— — 0.004
0° 3° 8°
— 0.002 0.005
0.041 REF
Rev. 1.0 June 2011
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