AOSMD AOZ1212DI

AOZ1212
EZBuck™ 3A Simple Buck Regulator
General Description
Features
The AOZ1212 is a high efficiency, simple to use, 3A buck
regulator flexible enough to be optimized for a variety of
applications. The AOZ1212 works from a 4.5V to 27V
input voltage range, and provides up to 3A of continuous
output current on each buck regulator output. The output
voltage is adjustable down to 0.8V.
●
4.5V to 27V operating input voltage range
●
70mΩ internal NFET, efficiency: up to 95%
●
Internal soft start
●
Output voltage adjustable down to 0.8V
●
3A continuous output current
The AOZ1212 comes in an SO-8 or DFN-8 package and
is rated over a -40°C to +85°C ambient temperature
range.
●
Fixed 370kHz PWM operation
●
Cycle-by-cycle current limit
●
Short-circuit protection
●
Thermal shutdown
●
Small size SO-8 or DFN-8 package
Applications
●
Point of load DC/DC conversion
●
Set top boxes
●
DVD drives and HDD
●
LCD monitors and TVs
●
Cable modems
●
Telecom/networking/datacom equipment
Typical Application
C7
VIN
C1
22µF
VIN
BS
EN
L1
6.8µH
AOZ1212
R1
C2, C3
22µF
FB
VBIAS
C4
VOUT
LX
COMP
GND
R2
RC
CC
Figure 1. 3.3V/3A Buck Regulator
Rev. 1.7 November 2010
www.aosmd.com
Page 1 of 18
AOZ1212
Ordering Information
Part Number
Ambient Temperature Range
Package
Environmental
AOZ1212AI
-40°C to +85°C
SO-8
AOZ1212DI
-40°C to +85°C
5 x 4 DFN-8
RoHS Compliant
Green Product
AOS Green Products use reduced levels of Halogens, and are also RoHS compliant.
Please visit www.aosmd.com/web/quality/rohs_compliant.jsp for additional information.
Pin Configuration
LX
1
8
VBIAS
LX
1
BST
2
7
VIN
BST
2
GND
3
6
EN
GND
3
FB
4
5
COMP
FB
VIN
8
VBIAS
7
VIN
6
EN
5
COMP
GND
4
SO-8
DFN-8
(Top View)
(Top Thru View)
Pin Description
Pin Number
Pin Name
Pin Function
1
LX
PWM output connection to inductor. LX pin needs to be connected externally. Thermal connection
for output stage.
2
BST
Bootstrap voltage input. High side driver supply. Connected to 0.1µF capacitor between BST and
LX.
3
GND
Ground.
4
FB
5
COMP
6
EN
Enable pin. The enable pin is active HIGH. Connect EN pin to VIN if not used. Do not leave the EN
pin floating.
7
VIN
Supply voltage input. Range from 4.5V to 27V. When VIN rises above the UVLO threshold the
device starts up. All VIN pins need to be connected externally.
8
VBIAS
Compensation pin of internal linear regulator. Place put a 1µF capacitor between this pin and
ground.
Rev. 1.7 November 2010
Feedback input. It is regulated to 0.8V. The FB pin is used to determine the PWM output voltage
via a resistor divider between the output and GND.
External loop compensation. Output of internal error amplifier. Connect a series RC network to
GND for control loop compensation.
www.aosmd.com
Page 2 of 18
AOZ1212
Block Diagram
VIN
+5V
VBIAS
UVLO
& POR
EN
5V LDO
Regulator
OTP
+
ISen
–
Reference
& Bias
Softstart
BST
ILimit
Q1
+
GM = 200µA/V
+
0.8V
EAmp
FB
–
–
PWM
Comp
PWM
Control
Logic
LX
+
COMP
+
0.2V
Frequency
Foldback
Comparator
Q2
370kHz/24kHz
Oscillator
–
GND
Absolute Maximum Ratings
Recommended Operating Conditions
Exceeding the Absolute Maximum Ratings may damage the device.
The device is not guaranteed to operate beyond the Recommended Operating Conditions.
Parameter
Supply Voltage (VIN)
Rating
LX to GND
-0.7V to VIN+0.3V
EN to GND
-0.3V to VIN+0.3V
FB to GND
-0.3V to 6V
COMP to GND
BST to GND
VBIAS to GND
-0.3V to 6V
VLX+6V
-0.3V to 6V
Junction Temperature (TJ)
+150°C
Storage Temperature (TS)
-65°C to +150°C
ESD Rating: Human Body Model(1)
2kV
Note:
1. Devices are inherently ESD sensitive, handling precautions are
required. Human body model rating: 1.5kΩ in series with 100pF.
Rev. 1.7 November 2010
Parameter
30V
Rating
Supply Voltage (VIN)
4.5V to 27V
Output Voltage Range
Ambient Temperature (TA)
Package Thermal Resistance
SO-8
DFN-8
0.8V to 0.85*VIN
-40°C to +85°C
(ΘJA)(2)
105°C/W
53°C/W
Note:
2. The value of ΘJA is measured with the device mounted on 1-in2
FR-4 board with 2oz. Copper, in a still air environment with TA =
25°C. The value in any given application depends on the user's specific board design.
www.aosmd.com
Page 3 of 18
AOZ1212
Electrical Characteristics
TA = 25°C, VIN = VEN = 12V, VOUT = 3.3V unless otherwise specified(3)
Symbol
VIN
Parameter
Conditions
Supply Voltage
Min.
Typ.
4.5
Max.
Units
27
V
Input Under-Voltage Lockout Threshold
VIN Rising
VIN Falling
Supply Current (Quiescent)
IOUT = 0, VFB = 1.2V, VEN > 2V
2
3
mA
IOFF
Shutdown Supply Current
VEN = 0V
3
20
µA
VFB
Feedback Voltage
0.8
0.818
VUVLO
IIN
IFB
4.3
4.1
0.782
V
V
Load Regulation
0.5
%
Line Regulation
0.08
%/V
Feedback Voltage Input Current
200
nA
ENABLE
VEN
EN Input Threshold
VHYS
EN Input Hysteresis
IEN
Off Threshold
On Threshold
0.6
2.5
200
Enable Sink/Source Current
V
mV
50
nA
425
kHz
MODULATOR
Frequency
315
DMAX
Maximum Duty Cycle
85
fO
370
%
DMIN
Minimum Duty Cycle
GVEA
Error Amplifier Voltage Gain
500
6
V/ V
%
GEA
Error Amplifier Transconductance
200
µA / V
PROTECTION
ILIM
Current Limit
4.0
6.0
A
Over-Temperature Shutdown Limit
TJ Rising
TJ Falling
145
100
°C
fSC
Short Circuit Hiccup Frequency
VFB = 0V
24
kHz
tSS
Soft Start Interval
6
ms
PWM OUTPUT STAGE
RDS(ON)
High-Side Switch On-Resistance
High-Side Switch Leakage
70
VEN = 0V, VLX = 0V
100
mΩ
10
µA
Note:
3. Specification in BOLD indicate an ambient temperature range of -40°C to +85°C. These specifications are guaranteed by design.
Rev. 1.7 November 2010
www.aosmd.com
Page 4 of 18
AOZ1212
Typical Performance Characteristics
Circuit of Figure 1. TA = 25°C, VIN = VEN = 24V, VOUT = 3.3V unless otherwise specified.
Light Load (DCM) Operation
Full Load (CCM) Operation
Vin ripple
0.1V/div
Vin ripple
0.1V/div
Vo ripple
20mV/div
Vo ripple
20mV/div
IL
1A/div
IL
1A/div
VLX
20V/div
VLX
20V/div
1μs/div
1μs/div
Startup to Full Load
Short Circuit Protection
Vo
2V/div
Vo
2V/div
lL
2A/div
lin
0.5A/div
2ms/div
200μs/div
50% to 100% Load Transient
Short Circuit Recovery
Vo
2V/div
Vo Ripple
200mV/div
lo
1A/div
200μs/div
Rev. 1.7 November 2010
IL
2A/div
2ms/div
www.aosmd.com
Page 5 of 18
AOZ1212
Efficiency Curves
Efficiency
Efficiency
VIN = 5V
VIN = 12V
100
100
95
95
3.3V OUTPUT
Efficieny (%)
Efficieny (%)
8.0V OUTPUT
90
1.8V OUTPUT
85
80
75
0.2
5.0V OUTPUT
90
3.3V OUTPUT
85
80
0.5 0.8
1.1
1.4 1.7
2.0 2.3
2.6
2.9
3.2
75
0.2
0.5 0.8
1.1
Current (A)
1.4 1.7
2.0 2.3
2.6
2.9
3.2
Current (A)
Efficiency
VIN = 24V
100
95
Efficieny (%)
8.0V OUTPUT
90
5.0V OUTPUT
85
3.3V OUTPUT
80
75
0.2
Rev. 1.7 November 2010
0.5 0.8
1.1
1.4 1.7 2.0 2.3
Current (A)
www.aosmd.com
2.6
2.9
3.2
Page 6 of 18
AOZ1212
Detailed Description
The AOZ1212 is a current-mode step down regulator
with integrated high side NMOS switch. It operates from
a 4.5V to 27V input voltage range and supplies up to 3A
of load current. The duty cycle can be adjusted from 6%
to 85% allowing a wide range of output voltages. Features include enable control, Power-On Reset, input
under voltage lockout, fixed internal soft-start and thermal shut down.
The AOZ1212 is available in an SO-8 or DFN-8 package.
Enable and Soft Start
The AOZ1212 has an internal soft start feature to limit
in-rush current and ensure the output voltage ramps up
smoothly to the regulation voltage. A soft start process
begins when the input voltage rises to 4.1V and voltage
on EN pin is HIGH. In the soft start process, the output
voltage is typically ramped to regulation voltage in 6.8ms.
The 6.8ms soft start time is set internally.
If the enable function is not used, connect the EN pin to
VIN. Pulling EN to ground will disable the AOZ1212. Do
not leave EN open. The voltage on the EN pin must be
above 2.5 V to enable the AOZ1212. When voltage on
EN pin falls below 0.6V, the AOZ1212 is disabled. If an
application circuit requires the AOZ1212 to be disabled,
an open drain or open collector circuit should be used to
interface with the EN pin.
high-side switch is off. The inductor current is freewheeling through the Schottky diode to the output.
Switching Frequency
The AOZ1212 switching frequency is fixed and set by
an internal oscillator. The switching frequency is set to
370kHz.
Output Voltage Programming
Output voltage can be set by feeding back the output to
the FB pin with a resistor divider network. In the application circuit shown in Figure 1. The resistor divider
network includes R1 and R2. Typically, a design is started
by picking a fixed R2 value and calculating the required
R1 value with equation below.
R 1⎞
⎛
V O = 0.8 × ⎜ 1 + -------⎟
R 2⎠
⎝
Some standard values for R1 and R2 for the most
commonly used output voltages are listed in Table 1.
Table 1.
R1 (kΩ)
VO (V)
0.8
1.0
R2 (kΩ)
Open
1.2
4.99
10
1.5
10
11.5
Steady-State Operation
1.8
12.7
10.2
Under steady-state conditions, the converter operates in
fixed frequency and Continuous-Conduction Mode
(CCM).
2.5
21.5
10
3.3
31.6
10
5.0
52.3
10
The AOZ1212 integrates an internal N-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. Since the N-MOSFET requires a
gate voltage higher than the input voltage, a boost
capacitor connected between the LX and BST pins drives
the gate. The boost capacitor is charged while LX is low.
An internal 10Ω switch from LX to GND is used to ensure
that LX is pulled to GND even in the light load. Output
voltage is divided down by the external voltage divider at
the FB pin. The difference of the FB pin voltage and
reference is amplified by the internal transconductance
error amplifier. The error voltage, which shows on the
COMP pin, is compared against the current signal. The
current signal 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
Rev. 1.7 November 2010
The combination of R1 and R2 should be large enough to
avoid drawing excessive current from the output, which
will cause power loss.
Protection Features
The AOZ1212 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 AOZ1212 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 0.4V and 2.5V internally.
The peak inductor current is automatically limited cycle
by cycle.
The cycle-by-cycle current limit threshold is internally set.
When the load current reaches the current limit threshold, the cycle-by-cycle current limit circuit turns off the
www.aosmd.com
Page 7 of 18
AOZ1212
high side switch immediately to terminate the current
duty cycle. The inductor current stops rising. The cycleby-cycle current limit protection directly limits inductor
peak current. The average inductor current is also limited
due to the limitation on the peak inductor current. When
cycle-by-cycle current limit circuit is triggered, the output
voltage drops as the duty cycle decreases.
another concern when selecting the capacitor. For a buck
circuit, the RMS value of input capacitor current can be
calculated by:
The AOZ1212 has internal short circuit protection to
protect itself from catastrophic failure under output short
circuit conditions. The FB pin voltage is proportional to
the output voltage. Whenever the FB pin voltage is below
0.2V, the short circuit protection circuit is triggered. To
prevent current limit running away when the comp pin
voltage is higher than 2.1V, the short circuit protection is
also triggered. As a result, the converter is shut down
and hiccups at a frequency equals to 1/16 of normal
switching frequency. The converter will start up via a soft
start once the short circuit condition is resolved. In short
circuit protection mode, the inductor average current is
greatly reduced because of the low hiccup frequency.
if let m equal the conversion ratio:
Power-On Reset (POR)
A power-on reset circuit monitors the input voltage.
When the input voltage exceeds 4.3V, the converter
starts operation. When input voltage falls below 4.1V,
the converter will stop switching.
VO ⎞
VO ⎛
I CIN_RMS = I O × --------- ⎜ 1 – ---------⎟
V IN ⎝
V IN⎠
VO
-------- = m
V IN
The relationship between the input capacitor RMS
current and voltage conversion ratio is calculated and
shown in Figure 2. It can be seen that when VO is half of
VIN, CIN is under the worst current stress. The worst
current stress on CIN is 0.5 x IO.
0.5
0.4
ICIN_RMS(m) 0.3
IO
0.2
0.1
Thermal Protection
0
An internal temperature sensor monitors the junction
temperature. It shuts down the internal control circuit and
high side NMOS if the junction temperature exceeds
145°C. The regulator will restart automatically under the
control of soft-start circuit when the junction temperature
decreases to 100°C.
Application Information
The basic AOZ1212 application circuit is shown in
Figure 1. Component selection is explained below.
Input Capacitor
The input capacitor (C1 in Figure 1) must be connected to
the VIN pin and GND pin of the AOZ1212 to maintain
steady input voltage and filter out the pulsing input
current. The voltage rating of the input capacitor must be
greater than maximum input voltage + ripple voltage.
The input ripple voltage can be approximated by equation below:
VO ⎞ VO
IO
⎛
ΔV IN = ----------------- × ⎜ 1 – ---------⎟ × --------V IN⎠ V IN
f × C IN ⎝
0
0.5
m
1
Figure 2. ICIN vs. Voltage Conversion Ratio
For reliable operation and best performance, the input
capacitors must have a current rating higher than
ICIN_RMS at the worst operating conditions. Ceramic
capacitors are preferred for input capacitors because of
their low ESR and high ripple current rating. Depending
on the application circuits, other low ESR tantalum
capacitor or aluminum electrolytic capacitor may also be
used. When selecting ceramic capacitors, X5R or X7R
type dielectric ceramic capacitors are preferred for their
better temperature and voltage characteristics. Note that
the ripple current rating from capacitor manufactures is
based on certain amount of life time. Further de-rating
may be necessary for practical design requirement.
Inductor
The inductor is used to supply constant current to output
when it is driven by a switching voltage. For given input
and output voltage, inductance and switching frequency
together decide the inductor ripple current, which is,
VO ⎞
VO ⎛
ΔI L = ----------- × ⎜ 1 – ---------⎟
V IN⎠
f×L ⎝
Since the input current is discontinuous in a buck
converter, the current stress on the input capacitor is
Rev. 1.7 November 2010
www.aosmd.com
Page 8 of 18
AOZ1212
The peak inductor current is:
ΔI L
I Lpeak = I O + -------2
High inductance gives low inductor ripple current but
requires larger size inductor to avoid saturation. Low
ripple current reduces inductor core losses. It also
reduces RMS current through inductor and switches,
which results in less conduction loss.
When selecting the inductor, make sure it is able to
handle the peak current without saturation even at the
highest operating temperature.
The inductor takes the highest current in a buck circuit.
The conduction loss on inductor needs to be checked for
thermal and efficiency requirements.
Surface mount inductors in different shape and styles are
available from Coilcraft, Elytone and Murata. Shielded
inductors are small and radiate less EMI noise. But they
cost more than unshielded inductors. The choice
depends on EMI requirement, price and size.
Output Capacitor
The output capacitor is selected based on the DC output
voltage rating, output ripple voltage specification and
ripple current rating.
The selected output capacitor must have a higher rated
voltage specification than the maximum desired output
voltage including ripple. De-rating needs to be considered for long term reliability.
Output ripple voltage specification is another important
factor for selecting the output capacitor. In a buck converter circuit, output ripple voltage is determined by
inductor value, switching frequency, output capacitor
value and ESR. It can be calculated by the equation
below:
1
ΔV O = ΔI L × ⎛ ESR CO + -------------------------⎞
⎝
8×f×C ⎠
ΔV O = ΔI L × ESR CO
For lower output ripple voltage across the entire operating temperature range, X5R or X7R dielectric type of
ceramic, or other low ESR tantalum capacitor or
aluminum electrolytic capacitor may also be used as output capacitors.
In a buck converter, output capacitor current is continuous. The RMS current of output capacitor is decided by
the peak to peak inductor ripple current. It can be calculated by:
ΔI L
I CO_RMS = ---------12
Usually, the ripple current rating of the output capacitor is
a smaller issue because of the low current stress. When
the buck inductor is selected to be very small and inductor ripple current is high, output capacitor could be overstressed.
Schottky Diode Selection
The external freewheeling diode supplies the current to
the inductor when the high side NMOS switch is off. To
reduce the losses due to the forward voltage drop and
recovery of diode, a Schottky diode is recommended.
The maximum reverse voltage rating of the chosen
Schottky diode should be greater than the maximum
input voltage, and the current rating should be greater
than the maximum load current.
Loop Compensation
The AOZ1212 employs peak current mode control for
easy use and fast transient response. Peak current mode
control eliminates the double pole effect of the output
L&C filter. It greatly simplifies the compensation loop
design.
O
where;
CO is output capacitor value and
ESRCO is the Equivalent Series Resistor of output capacitor.
When low ESR ceramic capacitor is used as output
capacitor, the impedance of the capacitor at the switching frequency dominates. Output ripple is mainly caused
by capacitor value and inductor ripple current. The output
ripple voltage calculation can be simplified to:
1
ΔV O = ΔI L × ⎛ -------------------------⎞
⎝8 × f × C ⎠
If the impedance of ESR at switching frequency
dominates, the output ripple voltage is mainly decided by
capacitor ESR and inductor ripple current. The output
ripple voltage calculation can be further simplified to:
With peak current mode control, the buck power stage
can be simplified to be a one-pole and one-zero system
in frequency domain. The pole is the dominant pole and
can be calculated by:
1
f p1 = ----------------------------------2π × C O × R L
O
Rev. 1.7 November 2010
www.aosmd.com
Page 9 of 18
AOZ1212
The zero is a ESR zero due to output capacitor and its
ESR. It is can be calculated by:
1
f Z1 = -----------------------------------------------2π × C O × ESR CO
The strategy for choosing RC and CC is to set the cross
over frequency with RC and set the compensator zero
with CC. Using selected crossover frequency, fC, to
calculate RC:
VO
2π × C O
R C = f C × ---------- × -----------------------------V
G ×G
where;
FB
CO is the output filter capacitor,
EA
CS
RL is load resistor value, and
where;
ESRCO is the equivalent series resistance of output capacitor.
fC is desired crossover frequency,
The compensation design is actually to shape the
converter close loop transfer function to get desired gain
and phase. Several different types of compensation
network can be used for AOZ1212. For most cases, a
series capacitor and resistor network connected to the
COMP pin sets the pole-zero and is adequate for a stable
high-bandwidth control loop.
In the AOZ1212, FB pin and COMP pin are the inverting
input and the output of internal transconductance error
amplifier. A series R and C compensation network
connected to COMP provides one pole and one zero.
The pole is:
G EA
f p2 = ------------------------------------------2π × C C × G VEA
GEA is the error amplifier transconductance, which is 200 x 10-6
A/V,
GVEA is the error amplifier voltage
The zero given by the external compensation network,
capacitor CC (C5 in Figure 1) and resistor RC (R1 in
Figure 1), is located at:
1
f Z2 = ----------------------------------2π × C C × R C
To design the compensation circuit, a target crossover
frequency fC for close loop must be selected. The system
crossover frequency is where the control loop has unity
gain. The crossover frequency is also called the
converter bandwidth. Generally a higher bandwidth
means faster response to load transient. However, the
bandwidth should not be too high due to system stability
concern. When designing the compensation loop,
converter stability under all line and load condition must
be considered.
Usually, it is recommended to set the bandwidth to be
less than 1/10 of switching frequency. It is recommended
to choose a crossover frequency less than 30kHz.
Rev. 1.7 November 2010
GEA is the error amplifier transconductance, which is 200x10-6
A/V, and
GCS is the current sense circuit transconductance, which is
5.64 A/V
The compensation capacitor CC and resistor RC together
make a zero. This zero is put somewhere close to the
dominate pole fp1 but lower than 1/5 of the selected
crossover frequency. CC can is selected by:
1.5
C C = ----------------------------------2π × R C × f p1
The equation above can also be simplified to:
where;
f C = 30kHz
VFB is 0.8V,
CO × RL
C C = --------------------RC
An easy-to-use application software which helps to
design and simulate the compensation loop can be found
at www.aosmd.com.
Thermal Management and Layout
Consideration
In the AOZ1212 buck regulator circuit, high pulsing
current flows through two circuit loops. The first loop
starts from the input capacitors, to the VIN pin, to the LX
pins, to the filter inductor, to the output capacitor and
load, and then returns to the input capacitor through
ground. Current flows in the first loop when the high side
switch is on. The second loop starts from inductor, to the
output capacitors and load, to the GND pin of the
AOZ1212, to the LX pins of the AZO1212. Current flows
in the second loop when the low side diode is on.
In PCB layout, minimizing the two loops area reduces the
noise of this circuit and improves efficiency. A ground
plane is recommended to connect input capacitor, output
capacitor, and GND pin of the AOZ1212.
In the AOZ1212 buck regulator circuit, the three major
power dissipating components are the AOZ1212,
external diode and output inductor. The total power
www.aosmd.com
Page 10 of 18
AOZ1212
dissipation of converter circuit can be measured by input
power minus output power.
P total_loss = V IN × I IN – V O × I O
The power dissipation of inductor can be approximately
calculated by output current and DCR of the inductor.
P inductor_loss = IO2 × R inductor × 1.1
Several layout tips are listed below for the best electric
and thermal performance. Figure 3a and Figure 3b show
layout examples for the AOZ1212A and AOZ1212D
respectively.
1. Do not use thermal relief connection to the VIN and
the GND pin. Pour a maximized copper area to the
GND pin and the VIN pin to help thermal dissipation.
2. Input capacitor should be connected as close as
possible to the VIN and GND pins.
The power dissipation of the diode is:
3. Make the current trace from LX pins to L to CO to
GND as short as possible.
VO ⎞
⎛
P diode_loss = I O × V F × ⎜ 1 – ---------⎟
V IN⎠
⎝
The actual AOZ1212 junction temperature can be
calculated with power dissipation in the AOZ1212 and
thermal impedance from junction to ambient.
T junction = ( P total_loss – P inductor_loss ) × Θ JA
+ + T ambient
4. Pour copper plane on all unused board area and
connect it to stable DC nodes, like VIN, GND or
VOUT.
5. Keep sensitive signal traces such as the trace
connecting FB and COMP pins away from the
LX pins.
The maximum junction temperature of AOZ1212 is
145°C, which limits the maximum load current capability.
The thermal performance of the AOZ1212 is strongly
affected by the PCB layout. Care should be taken by
users during design process to ensure that the IC will
operate under the recommended environmental
conditions.
Rev. 1.7 November 2010
www.aosmd.com
Page 11 of 18
R2
Cc
Rc
5 COMP
6 EN
3 GND
7 Vin
2 BST
8 VBIAS
1 LX
C4
Cb
VIN
4 FB
AOZ1210 /2
R1
C1
AOZ1212
L1
Vo
C2
C
2
Rc
COMP
5
4
FB
3
GND
2
BST
1
LX
R1
Cc
R2
Figure 3a. Layout Example for AOZ1212AI
6
Vin
7
VBIAS
Vin
8
Cb
EN
C4
C1
GND
Vo
L1
C2
C
2
Figure 3b. Layout Example for AOZ1212DI
Rev. 1.7 November 2010
www.aosmd.com
Page 12 of 18
AOZ1212
Package Dimensions, SO-8
D
Gauge Plane
Seating Plane
e
0.25
8
L
E
E1
h x 45°
1
C
θ
7° (4x)
A2 A
0.1
b
A1
Dimensions in millimeters
2.20
5.74
1.27
0.80
Unit: mm
Symbols
A
Min.
1.35
A1
A2
Dimensions in inches
Max.
1.75
0.25
1.65
Symbols
A
Min.
0.053
Nom.
0.065
Max.
0.069
0.10
1.25
Nom.
1.65
—
1.50
A1
A2
0.004
0.049
—
0.059
0.010
0.065
b
c
D
0.31
0.17
4.80
—
—
4.90
0.51
0.25
5.00
b
c
D
0.012
0.007
0.189
—
—
0.193
0.020
0.010
0.197
E1
e
E
3.80
3.90
4.00
1.27 BSC
0.150
h
L
0.25
0.40
6.00
—
—
6.20
0.50
1.27
E1
e
E
h
L
0.010
0.016
—
—
0.020
0.050
θ
0°
—
8°
θ
0°
—
8°
5.80
0.154 0.157
0.050 BSC
0.228 0.236 0.244
Notes:
1. All dimensions are in millimeters.
2. Dimensions are inclusive of plating
3. Package body sizes exclude mold flash and gate burrs. Mold flash at the non-lead sides should be less than 6 mils.
4. Dimension L is measured in gauge plane.
5. Controlling dimension is millimeter, converted inch dimensions are not necessarily exact.
Rev. 1.7 November 2010
www.aosmd.com
Page 13 of 18
AOZ1212
Tape and Reel Dimensions, SO-8
SO-8 Carrier Tape
P1
D1
See Note 3
P2
T
See Note 5
E1
E2
E
See Note 3
B0
K0
A0
D0
P0
Feeding Direction
Unit: mm
Package
SO-8
(12mm)
A0
6.40
±0.10
B0
5.20
±0.10
K0
2.10
±0.10
D0
1.60
±0.10
D1
1.50
±0.10
E
12.00
±0.10
SO-8 Reel
E1
1.75
±0.10
E2
5.50
±0.10
P0
8.00
±0.10
P1
4.00
±0.10
P2
2.00
±0.10
T
0.25
±0.10
W1
S
G
N
M
K
V
R
H
W
N
Tape Size Reel Size
M
W
12mm
ø330
ø330.00 ø97.00 13.00
±0.10 ±0.30
±0.50
W1
17.40
±1.00
H
K
ø13.00
10.60
+0.50/-0.20
S
2.00
±0.50
G
—
R
—
V
—
SO-8 Tape
Leader/Trailer
& Orientation
Trailer Tape
300mm min. or
75 empty pockets
Rev. 1.7 November 2010
Components Tape
Orientation in Pocket
www.aosmd.com
Leader Tape
500mm min. or
125 empty pockets
Page 14 of 18
AOZ1212
Package Dimensions, 5x4A DFN-8
e
L3*
L
D
Index Area
(D/2 x E/2)
D/2
E2
L1
L2*
Pin #1 IDA
Option 1
E/2
E
L2*
D3
Chamfer 0.30
D2
BOTTOM VIEW
TOP VIEW
A3
A
Pin #1 IDA
Option 2
Seating
Plane
b
R
BOTTOM VIEW
FRONT VIEW
Dimensions in millimeters
RECOMMENDED LAND PATTERN
0.50 Typ.
0.95 Typ.
0.285
0.65
2.25
1.86
1.165
4.20
2.33
0.40
0.285
4.51
Notes:
1. Dimensions and tolerancing conform to ASME Y14.5M-1994.
Symbols
A
Min.
0.70
A3
b
D
0.40
4.90
D2
D3
2.05
1.66
E
E2
e
L
3.90
2.23
L1
L2
L3
R
aaa
—
Max.
0.80
Dimensions in inches
Symbols
A
Min.
0.028
A3
b
D
0.016
0.190
2.25
1.86
D2
D3
0.080
0.064
4.00
4.10
2.33
2.43
0.95 BSC
0.50
0.55
0.60
E
E2
e
L
0.154
0.088
L1
L2
L3
R
aaa
—
bbb
ccc
ddd
eee
Nom.
0.75
0.20 Ref.
0.45
0.50
5.00
5.10
2.15
1.76
0.40
—
0.285 Ref.
0.835 Ref.
0.30 Ref.
0.15
0.10
0.10
0.08
0.05
bbb
ccc
ddd
eee
Nom.
0.30
Max.
0.032
0.008 Ref.
0.018 0.020
0.200 0.201
0.085
0.070
0.089
0.074
0.157 0.161
0.092 0.096
0.037 BSC
0.020 0.022 0.024
0.016
—
0.011 Ref.
0.033 Ref.
0.012 Ref.
0.006
0.004
0.004
0.003
0.002
2. All dimensions are in millimeters.
3. The location of the terminal #1 identifier and terminal numbering convention conforms to JEDEC publication 95 SP-002.
4. Dimension b applies to metallized terminal and is measured between 0.15mm and 0.30mm from the terminal tip. If the terminal has the
optional radius on the other end of the terminal, the dimension b should not be measured in that radius area.
5. Coplanarity applies to the terminals and all other bottom surface metallization.
6. Drawing shown are for illustration only.
7. The dimensions with * are just for reference
8. Pin #3 and Pin #7 are fused to DAP.
Rev. 1.7 November 2010
www.aosmd.com
Page 15 of 18
AOZ1212
Tape and Reel Dimensions, 5x4A DFN-8
Tape
R0
20
0.
.40
T
D1
E1
E2
D0
E
B0
Feeding
Direction
K0
P0
A0
UNIT: mm
Package
A0
B0
K0
D0
D1
E
E1
E2
P0
P1
P2
T
DFN 5x4
(12 mm)
5.30
±0.10
4.30
±0.10
1.20
±0.10
1.50
Min.
Typ.
1.50
+0.10 / –0
12.00
±0.30
1.75
±0.10
5.50
±0.10
8.00
±0.10
4.00
±0.20
2.00
±0.10
0.30
±0.05
Leader/Trailer and Orientation
Trailer Tape
300mm Min.
Rev. 1.7 November 2010
Components Tape
Orientation in Pocket
www.aosmd.com
Leader Tape
500mm Min.
Page 16 of 18
AOZ1212
II
R1
59
Reel
I
R1
M
6.0±1
21
R1
27
I
Zoom In
R6
R1
P
R5
5
B
W1
III
Zoom In
Tape Size
Reel Size
M
W1
B
P
3-1.8
0.05
12mm
ø330
ø330
12.40
+0.3
-4.0
+2.0
-0.0
2.40
±0.3
0.5
II
"
A A
N=ø100±2
ø9
6±
0.2
05
/4
.9
±0
.
ø1
A
ø2
3-
3-
3-ø1
/8"
Zoom In
1.8
6.0
1.8
6.45±0.05
8.00
6.2
ø2
2.20
1.
8.9±0.1
14 REF
0
ø90.0
20
0
R1.10
R3.10
2.00
5.0
C
1.8
12 REF
11.90
ø86
.0±0
.1
10°
41.5 REF
43.00
44.5±0.1
44.5±0.1
R3
.95
4.0
6.10
/1
6"
VIEW: C
3ø3
38°
40°
10.0
RE
F
46.0±0.1
R0.5
3.3
6.50
R4
8
R1
ø13.0
ø17.0
A
0.00
-0.05
3-
8.0±0.1
ø3
/1
2.00
6.50
0.80
3.00
2.5
1.80
+0.05
6"
8.000.00
10.71
6°
Rev. 1.7 November 2010
www.aosmd.com
Page 17 of 18
AOZ1212
Part Marking
AOZ1212AI
Z1212AI
FAYWLT
Part Number
Assembly Lot Code
Fab & Assembly Location
Year & Week Code
AOZ1212DI
Z1212DI
FAYWLT
Part Number
Assembly Lot Code
Fab & Assembly Location
Year & Week Code
This data sheet contains preliminary data; supplementary data may be published at a later date.
Alpha & Omega Semiconductor reserves the right to make changes at any time without notice.
LIFE SUPPORT POLICY
ALPHA & OMEGA SEMICONDUCTOR PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL
COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS.
As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant into
the body or (b) support or sustain life, and (c) whose
failure to perform when properly used in accordance
with instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of
the user.
Rev. 1.7 November 2010
2. A critical component in any component of a life
support, device, or system whose failure to perform can
be reasonably expected to cause the failure of the life
support device or system, or to affect its safety or
effectiveness.
www.aosmd.com
Page 18 of 18