Analogic AAT1162IRN-0.6-T1 12v, 1.5a step-down dc/dc converter Datasheet

AAT1162
12V, 1.5A Step-Down DC/DC Converter
General Description
Features
The AAT1162 is an 800kHz high efficiency stepdown DC/DC converter. With a wide input voltage
range of 4.0V to 13.2V, the AAT1162 is an ideal
choice for dual-cell Lithium-ion battery-powered
devices and mid-power-range regulated 12V-powered industrial applications. The internal power
switches are capable of delivering up to 1.5A to the
load.
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The AAT1162 is a highly integrated device, simplifying system-level design. Minimum external components are required for the converter.
The AAT1162 optimizes efficiency throughout the
entire load range. It operates in a combination
PWM/Light Load mode for improved light-load efficiency. The high switching frequency allows the use
of small external components. The low current shutdown feature disconnects the load from VIN and
drops shutdown current to less than 1µA.
The AAT1162 is available in a Pb-free, space-saving, thermally-enhanced 16-pin TDFN34 packageand is rated over an operating temperature range
of -40°C to +85°C.
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•
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SwitchReg™
Input Voltage Range: 4.0V to 13.2V
Up to 1.5A Load Current
Fixed or Adjustable Output:
— Output Voltage: 0.6V to VIN
Low 115µA No-Load Operating Current
Less than 1µA Shutdown Current
Up to 96% Efficiency
Integrated Power Switches
800kHz Switching Frequency
Soft Start Function
Short-Circuit and Over-Temperature Protection
Minimum External Components
TDFN34-16 Package
Temperature Range: -40°C to +85°C
Applications
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Distributed Power Systems
Industrial Applications
Laptop Computers
Portable DVD Players
Portable Media Players
Set-Top Boxes
TFT LCD Monitors and HDTVs
Typical Application
L
Input:
4.0V ~ 13.2V
IN
CIN
LX
2.2µH
EN
DGND
AIN
Output:
0.6V min,
1.5A max
AAT1162
FB
COUT
47µF
1162.2007.09.1.2
COMP
PGND
LDO
AGND
1
AAT1162
12V, 1.5A Step-Down DC/DC Converter
Pin Descriptions
Pin #
Symbol
1, 2, EP2
LX
3, 12
4, 5
N/C
IN
6, 13,
14, EP1
DGND
7
AIN
8
LDO
9
FB
10
COMP
11
15
AGND
EN
16
PGND
Function
Power switching node. LX is the drain of the internal P-channel switch and N-channel synchronous rectifier. Connect the output inductor to the two LX pins and to EP2. A large
exposed copper pad under the package should be used for EP2.
Not connected.
Power source input. Connect IN to the input power source. Bypass IN to DGND with a
22µF or greater capacitor. Connect both IN pins together as close to the IC as possible. An
additional 100nF ceramic capacitor should also be connected between the two IN pins and
DGND, pin 6
Exposed Pad 1 Digital Ground, DGND. The exposed thermal pad (EP1) should be connected
to board ground plane and pins 6, 13, and 14. The ground plane should include a large
exposed copper pad under the package for thermal dissipation (see package outline).
Internal analog bias input. AIN supplies internal power to the AAT1162. Connect AIN to the
input source voltage and bypass to AGND with a 0.1µF or greater capacitor. For additional
noise rejection, connect to the input power source through a 10Ω or lower value resistor.
Internal LDO bypass node. The output voltage of the internal LDO is bypassed at LDO. The
internal circuitry of the AAT1162 is powered from LDO. Do not draw external power from LDO.
Bypass LDO to AGND with a 1µF or greater capacitor.
Output voltage feedback input. FB senses the output voltage for regulation control. For fixed
output versions, connect FB to the output voltage. For adjustable versions, drive FB from the
output voltage through a resistive voltage divider. The FB regulation threshold is 0.6V.
Control compensation node. Connect a series RC network from COMP to AGND, R = 51k
and C = 270pF.
Analog signal ground. Connect AGND to PGND at a single point as close to the IC as possible.
Active high enable input. Drive EN high to turn on the AAT1162; drive it low to turn it off. For
automatic startup, connect EN to IN through a 4.7kΩ resistor. EN must be biased high, biased
low, or driven to a logic level by an external source. Do not let the EN pin float when the
device is powered.
Power ground. Connect AGND to PGND at a single point as close to the IC as possible.
Pin Configuration
TDFN34-16
(Top View)
LX
LX
N/C
IN
IN
DGND
AIN
LDO
2
1
2
EP2
16
15
3
14
4
13
5
6
EP1
12
11
7
10
8
9
PGND
EN
DGND
DGND
N/C
AGND
COMP
FB
1162.2007.09.1.2
AAT1162
12V, 1.5A Step-Down DC/DC Converter
Absolute Maximum Ratings1
Symbol
Description
VIN, VAIN
VLX
VFB
VEN
TJ
Input Voltage
LX to GND Voltage
FB to GND Voltage
EN to GND Voltage
Operating Junction Temperature Range
Value
Units
-0.3 to 14
-0.3 to VIN + 0.3
-0.3 to VIN + 0.3
-0.3 to VIN + 0.3
-40 to 150
V
V
V
V
°C
Value
Units
2.7
37
W
°C/W
Thermal Information3
Symbol
PD
θJA
Description
Maximum Power Dissipation4
Thermal Resistance
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions
other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.
2. Based on long-term current density limitation.
3. Mounted on an FR4 board.
4. Derate 2.7mW/°C above 25°C.
1162.2007.09.1.2
3
AAT1162
12V, 1.5A Step-Down DC/DC Converter
Electrical Characteristics1
4.0V < VIN < 13.2V. CIN = COUT = 22µF; L = 4.7µH, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = 25°C.
Symbol
VIN
VUVLO
IQ
ISHDN
VOUT
VOUT
∆VOUT/
VOUT/∆VIN
∆VOUT/
IOUT
VFB
IFBLEAK
FOSC
Description
Input Under-Voltage Lockout
Supply Current
Shutdown Current
Output Voltage Range
Output Voltage Accuracy
0.3
115
IOUT = 0A to 1.5A
VIN = 4.5V to 13.2V
Load Regulation
VIN = 12V, VOUT = 5V,
IOUT = 0A to 1.5A
Feedback Reference Voltage
(adjustable version)
No Load, TA = 25°C
FB Leakage Current
VOUT = 1.2V
RDS(ON)H
P-Channel On Resistance
RDS(ON)L
N-Channel On Resistance
Efficiency
PMOS Current Limit
LX Leakage Current
Typ
4.0
Rising
Hysteresis
No Load
VEN = GND
Line Regulation
DC
TON
TS
ILXLEAK
Min
Input Voltage Range
PWM Oscillator Frequency
Foldback Frequency
Maximum Duty Cycle
Minimum Turn-On Time
Soft-Start Time
η
ILIM
Conditions
0.6
-2.5
0.023
Max
Units
13.2
4.0
V
200
1
0.94 VIN
2.5
µA
µA
V
%
0.100
%/V
0.4
0.59
0.60
0.6
2
0.8
200
Adjustable Version
Fixed Version
%
0.61
0.2
1
94
VIN
VIN
VIN
VIN
VIN
=
=
=
=
=
12V
6V
12V
6V
12V, VOUT = 5V, IOUT = 1.5A
2.0
VIN = 13.2V, VLX = 0 to VIN
V
100
200
0.12
0.15
0.06
0.08
93
3.0
V
µA
MHz
kHz
%
ns
µs
Ω
Ω
1
%
A
µA
1. The AAT1162 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured
by design, characterization, and correlation with statistical process controls.
4
1162.2007.09.1.2
AAT1162
12V, 1.5A Step-Down DC/DC Converter
Electrical Characteristics1
4.0V < VIN < 13.2V. CIN = COUT = 22µF; L = 4.7µH, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = 25°C.
Symbol
TSD
THYS
VIL
VIH
IEN
Description
Over-Temperature Shutdown
Threshold
Over-Temperature Shutdown
Hysteresis
EN Logic Low Input Threshold
EN Logic High Input Threshold
EN Input Current
Conditions
Min
Typ
Max
140
°C
25
°C
0.4
VEN = 0V, VEN = 13.2V
1.4
-1.0
Units
1.0
V
V
µA
1. The AAT1162 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured
by design, characterization, and correlation with statistical process controls.
1162.2007.09.1.2
5
AAT1162
12V, 1.5A Step-Down DC/DC Converter
Typical Characteristics
Test circuit of Figure 2, unless otherwise specified.
Efficiency vs. Output Current
Efficiency vs. Output Current
(VOUT = 5V)
(VOUT = 3.3V)
100
100
90
90
VIN = 10V
60
VIN = 8.4V
50
40
VIN = 6V
30
VIN = 12V
80
VIN = 12V
70
Efficiency (%)
Efficiency (%)
80
70
VIN = 8.4V
60
50
VIN = 6V
40
VIN = 5V
30
20
20
10
10
0
0
0.001
0.01
0.1
1
0.001
10
0.01
0.1
Output Current (A)
VIN = 12V
140
810
5V
805
Current (µA)
Switching Frequency (kHz)
150
815
800
795
12V
785
780
130
120
110
VIN = 5V
100
90
775
80
770
-40 -30 -20 -10
0
10
20
30
40
50
60
70
80
-40 -30 -20 -10
90
Temperature (°C)
0
10
20
30
40
50
60
70
80
90
Temperature (°C)
Non-Switching Quiescent Current
vs. Input Voltage
Switching Quiescent Current vs. Input Voltage
(VOUT = 5V)
150
25°C
85°C
130
Quiescent Current (µA)
220
140
Current (µA)
10
Non-Switching Quiescent Current
vs. Temperature
820
790
1
Output Current (A)
Switching Frequency vs. Temperature
120
110
100
-40°C
90
80
5
6
7
8
9
Input Voltage (V)
6
VIN = 10V
10
11
12
210
85°C
25°C
200
190
180
-40°C
170
160
150
6
7
8
9
10
11
12
Input Voltage (V)
1162.2007.09.1.2
AAT1162
12V, 1.5A Step-Down DC/DC Converter
Typical Characteristics
Test circuit of Figure 2, unless otherwise specified.
Switching Quiescent Current vs. Input Voltage
On Time vs. Temperature
(VOUT = 3.3V)
(VOUT = 3.3V)
1000
900
200
800
85°C
On Time (ns)
Quiescent Current (µA)
210
25°C
190
180
170
-40°C
VIN = 5V
700
600
500
VIN = 12V
400
300
200
160
100
0
-40 -30 -20 -10
150
5
6
7
8
9
10
11
12
20
30
40
50
Output Voltage Tolerance vs. Temperature
Line Regulation
(VOUT = 3.3V; ILOAD = 1.5A)
(VOUT = 5V)
1
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-40 -30
-20 -10
0
10
20
30
40
50
60
70
80
90
IOUT = 500mA
0.2
0
IOUT = 1mA
-0.1
IOUT = 100mA
-0.2
6
7
0
I OUT = 1mA
-0.2
-0.3
6
7
8
9
Input Voltage (V)
1162.2007.09.1.2
10
11
12
Output Voltage Difference (%)
IOUT = 1.5A
0.1
5
8
9
10
11
12
(VOUT = 5V)
I OUT = 1A
I OUT = 10mA
I OUT =100mA
IOUT = 10mA
-0.3
Load Regulation
-0.1
90
0.1
Line Regulation
0.2
80
IOUT = 1.5A
Input Voltage (V)
0.3
70
0.3
Temperature (°C)
0.4
60
0.4
(VOUT = 3.3V)
Output Voltage Difference (%)
10
Temperature (°C)
Output Voltage Difference (%)
Output Voltage Difference (%)
Input Voltage (V)
0
0.4
VIN = 12V
0.3
VIN = 10V
0.2
0.1
0
VIN = 8.4V
-0.1
VIN = 6V
-0.2
-0.3
0.0001
0.001
0.01
0.1
1
10
Output Current (mA)
7
AAT1162
12V, 1.5A Step-Down DC/DC Converter
Typical Characteristics
Test circuit of Figure 2, unless otherwise specified.
Load Regulation
N-Channel RDS(ON) vs. Temperature
120
0.4
VIN = 12V
0.3
VIN = 10V
0.2
Resistance (mΩ
Ω)
Output Voltage Difference (%)
(VOUT = 3.3V)
0.1
VIN = 8.4V
0
VIN = 5V VIN = 6V
-0.1
-0.2
80
60
40
VIN = 12V
20
0
-0.3
0.0001
VIN = 6V
100
0.001
0.01
0.1
1
-40
10
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
Temperature (°C)
Output Current (mA)
P-Channel RDS(ON) vs. Temperature
Line Transient
8
3.48
180
7
3.45
6
3.42
5
3.39
4
3.36
3
3.33
2
3.3
1
3.27
0
3.24
160
Input Voltage (top) (V)
200
VIN = 6V
140
120
100
80
60
VIN = 12V
40
20
0
-40 -30 -20 -10
0
10
20
30
40
50
60
70
80
90
Temperature (°C)
Load Transient
(VOUT = 3.3V; CFF = 100pF)
Output Voltage (top) (V)
4.4
1A
3
10mA
4.2
2
1.5
4
1
3.8
0.5
3.6
0
Time (50µs/div)
8
2.5
3.6
3.5
3.4
3
3.2
2.5
1.2A
3
2
10mA
2.8
1.5
2.6
1
2.4
0.5
2.2
0
2
-0.5
Load and Inductor Current
(bottom) (A)
4.6
3.5
Load and Inductor Current
(bottom) (A)
4
Output Voltage (top) (V)
Load Transient
5
4.8
Time (20µs/div)
(VOUT = 5V; CFF = 100pF)
5.2
Output Voltage (bottom) (V)
Resistance (mΩ
Ω)
(VOUT = 3.3V; CFF = 100pF)
Time (50µs/div)
1162.2007.09.1.2
AAT1162
12V, 1.5A Step-Down DC/DC Converter
Typical Characteristics
Load Transient
(VOUT = 5V; No CFF)
(VOUT = 3.3V; No CFF)
4
5.1
3.5
4.8
3
1A
4.5
2.5
10mA
4.2
3.9
1.5
3.6
1
3.3
0.5
3
0
Time (50µs/div)
1162.2007.09.1.2
2
3.6
4
3.4
3.5
3.2
3
3
1.2A
2.5
2
2.8
10mA
2.6
1.5
2.4
1
2.2
0.5
0
2
Load and Inductor Current
(bottom) (A)
5.4
Output Voltage (top) (V)
Load Transient
Load and Inductor Current
(bottom) (A)
Output Voltage (top) (V)
Test circuit of Figure 2, unless otherwise specified.
Time (50µs/div)
9
AAT1162
12V, 1.5A Step-Down DC/DC Converter
Functional Block Diagram
AIN
IN
LDO
Note 1
FB
Internal
Power
Current
Sense Amp
+
LDO
+
+
Error
Amp
Current
Mode
Comparator
-
Control
Logic
Reference
LX
PGND
AGND
EN
DGND
COMP
. to the
Note 1: For fixed output voltage versions, FB is connected
error amplifier through the resistive voltage divider shown.
Functional Description
The AAT1162 is a current-mode step-down DC/DC
converter that operates over a wide 4V to 13.2V
input voltage range and is capable of supplying up
to 1.5A to the load with the output voltage regulated
as low as 0.6V. Both the P-channel power switch
and N-channel synchronous rectifier are internal,
reducing the number of external components
required. The output voltage is adjusted by an external resistor divider; fixed output voltage versions are
available upon request. The regulation system is
externally compensated, allowing the circuit to be
optimized for each application. The AAT1162
includes cycle-by-cycle current limiting, frequency
foldback for improved short-circuit performance, and
thermal overload protection to prevent damage in
the event of an external fault condition.
10
Control Loop
The AAT1162 regulates the output voltage using
constant frequency current mode control. The
AAT1162 monitors current through the high-side Pchannel MOSFET and uses that signal to regulate
the output voltage. This provides improved transient response and eases compensation. Internal
slope compensation is included to ensure the current "inside loop" stability.
High efficiency is maintained under light load conditions by automatically switching to variable frequency Light Load control. In this condition, transition losses are reduced by operating at a lower frequency at light loads.
1162.2007.09.1.2
AAT1162
12V, 1.5A Step-Down DC/DC Converter
Short-Circuit Protection
The AAT1162 uses a cycle-by-cycle current limit to
protect itself and the load from an external fault
condition. When the inductor current reaches the
internally set 3.0A current limit, the P-channel
MOSFET switch turns off and the N-channel synchronous rectifier is turned on, limiting the inductor
and the load current.
During an overload condition, when the output voltage drops below 50% of the regulation voltage
(0.3V at FB), the AAT1162 switching frequency
drops by a factor of 4. This gives the inductor current ample time to reset during the off time to prevent the inductor current from rising uncontrolled in
a short-circuit condition.
Thermal Protection
The AAT1162 includes thermal protection that disables the regulator when the die temperature
reaches 140ºC. It automatically restarts when the
temperature decreases by 25ºC or more.
Applications Information
Setting the Output Voltage
Figure 1 shows the basic application circuit for the
AAT1162 and output setting resistors. Resistors
R1 and R2 program the output to regulate at a voltage higher than 0.6V. To limit the bias current
required for the external feedback resistor string
while maintaining good noise immunity, the minimum suggested value for R2 is 5.9kΩ. Although a
larger value will further reduce quiescent current, it
will also increase the impedance of the feedback
node, making it more sensitive to external noise
and interference. Table 1 summarizes the resistor
values for various output voltages with R2 set to
either 5.9kΩ for good noise immunity or 59kΩ for
reduced no load input current.
EP2
VIN 4.5V -13.2V
C1
22µF
R4
10Ω
C6
0.1µF
C7
1µ F
3
EN
4
IN
5
IN
7
AIN
6 DGND
13
DGND
16
PGND
LX
LX
LX
AAT1162
FB
1
2
9
COMP 10
AGND 11
DGND
DGND
EP1
LDO
14
L1
3.8µH
C3
100pF
R3
50kΩ
VOUT
5V, 2A
R1
43.2kΩ C2
22µF
R2
5.9kΩ
8
C5
1µ F
C4
270pF
Figure 1: Typical Application Circuit.
The adjustable feedback resistors, combined with
an external feed forward capacitor (C3 in Figure 1),
deliver enhanced transient response for extreme
pulsed load applications. The addition of the feed
forward capacitor typically requires a larger output
capacitor C2 for stability. Larger C3 values reduce
overshoot and undershoot during startup and load
changes. However, do not exceed 470pF to maintain stable operation.
1162.2007.09.1.2
11
AAT1162
12V, 1.5A Step-Down DC/DC Converter
The external resistors set the output voltage
according to the following equation:
⎛
R1 ⎞
VOUT = 0.6V 1 +
⎝
R2 ⎠
or
⎛ VOUT ⎞
R1 = V
-1 · R2
⎝ REF ⎠
Table 1 shows the resistor selection for different
output voltage settings.
VOUT (V)
R2 = 5.9(kΩ)
R1 (kΩ)
R2 = 59(kΩ)
R1 (kΩ)
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.8
1.85
2.0
2.5
3.3
5.0
1.96
2.94
3.92
4.99
5.90
6.81
7.87
8.87
11.8
12.4
13.7
18.7
26.7
43.2
19.6
29.4
39.2
49.9
59.0
68.1
78.7
88.7
118
124
137
187
267
432
Table 1: Resistor Selection for Different Output
Voltage Settings. Standard 1% Resistors are
Substituted for Calculated Values.
12
Inductor Selection
For most designs, the AAT1162 operates with
inductors of 2µH to 4.7µH. For output voltages
above 3.3V, the minimum recommended inductor is
3.8µH. For 3.3V and below, use a 2 to 2.2µH inductor. For optimum voltage-positioning load transients,
choose an inductor with DC series resistance in the
15mΩ to 20mΩ range. For higher efficiency at
heavy loads (above 1A), or minimal load regulation
(but some transient overshoot), the resistance
should be kept below 18mΩ. The DC current rating
of the inductor should be at least equal to the maximum load current plus half the ripple current to prevent core saturation (1.5A + 263mA). Table 2 lists
some typical surface mount inductors that meet target applications for the AAT1162.
Manufacturer's specifications list both the inductor
DC current rating, which is a thermal limitation, and
the peak current rating, which is determined by the
saturation characteristics. The inductor should not
show any appreciable saturation under normal load
conditions. Some inductors may meet the peak and
average current ratings yet result in excessive losses due to a high DCR. Always consider the losses
associated with the DCR and its effect on the total
converter efficiency when selecting an inductor.
For example, the 3.7µH CDR7D43 series inductor
selected from Sumida has an 18.9mΩ DCR and a
4.3ADC current rating. At full load, the inductor DC
loss is 28mW which gives only a 0.4% loss in efficiency for a 1.5A, 5V output.
Compensation
The AAT1162 step-down converter uses peak current mode control with slope compensation
scheme to maintain stability with lower value inductors for duty cycles greater than 50%. The regulation feedback loop in the IC is stabilized by the
components connected to the COMP pin, as
shown in Figure 1.
1162.2007.09.1.2
AAT1162
12V, 1.5A Step-Down DC/DC Converter
Manufacturer
Part Number
Sumida
Sumida
Coilcraft
CDRH103RNP-2R2N
CDR7D43MNNP-3R7NC
MSS1038-382NL
L (µH)
Max DCR
(mΩ)
Rated DC
Current (A)
Size WxLxH
(mm)
2.2
3.7
3.8
16.9
18.9
13
5.10
4.3
4.25
10.3x10.5x3.1
7.6x7.6x4.5
10.2x7.7x3.8
Table 2: Typical Surface Mount Inductors.
Layout Guidance
Figure 2 is the schematic for the evaluation board.
When laying out the PC board, the following layout
guideline should be followed to ensure proper
operation of the AAT1162:
1. Exposed pad EP1 must be reliably soldered to
PGND/DGND/AGND. The exposed thermal
pad should be connected to board ground
plane and pins 6, 11, 13, 14 and 16. The ground
plane should include a large exposed copper
pad under the package for thermal dissipation.
2. The power traces, including GND traces, the
LX traces and the VIN trace should be kept
short, direct and wide to allow large current
flow. The L1 connection to the LX pins should
be as short as possible. Use several via pads
when routing between layers.
3. Exposed pad pin EP2 must be reliably soldered to the LX pins 1 and 2. The exposed
thermal pad should be connected to the board
LX connection and the inductor L1 and also
pins 1 and 2. The LX plane should include a
large exposed copper pad under the package
for thermal dissipation.
1162.2007.09.1.2
4. The input capacitors (C9 and C1) should be
connected as close as possible to IN (Pins 4 and
5) and DGND (Pin 6) to get good power filtering.
5. Keep the switching node LX away from the
sensitive FB node.
6. The feedback trace for the FB pin should be
separate from any power trace and connected
as closely as possible to the load point.
Sensing along a high-current load trace will
degrade DC load regulation. The feedback
resistors should be placed as close as possible
to the FB pin (Pin 9) to minimize the length of
the high impedance feedback trace.
7. The output capacitors C3, 4, and 5 and L1
should be connected as close as possible and
there should not be any signal lines under the
inductor.
8. The resistance of the trace from the load return
to the PGND (Pin 16) should be kept to a minimum. This will help to minimize any error in
DC regulation due to differences in the potential of the internal signal ground and the power
ground.
13
AAT1162
12V, 1.5A Step-Down DC/DC Converter
Enable
J1
1
EP2
U1
VIN
R5 4.7k
FB1 1.5A 330
4
R4
10
C2
10µF
16V
C1
22µF
16V
15
5
3
C9
0.1µF
16V
7
C8
0.1µF
16V
EN
IN
IN
N/C
AIN
AAT1162
LX
6
13
DGND
DGND
16
PGND DGND
LX
LX
FB
COMP
AGND
N/C
DGND
LDO
VOUT
L1
1
2
3.8µH 6A
C10
100pF
9
10
11
12
R3
51k
C11
NP
14
8
LDO
R1
43.2k
R2
5.9k
C3
22µF
C3
22µF
C3
22µF
C7
270pF
EP1
C6
1µF
DGND
Note: Connect GND, DGND, and AGND at IC
FB1: Chip Ferrite Bead
C10: Increase C10 to reduce overshoot
Figure 2: AAT1162 Evaluation Board Schematic.
Figure 3: AAT1162 Evaluation Board
Component Side Layout.
14
Figure 4: AAT1162 Evaluation Board
Solder Side Layout.
1162.2007.09.1.2
AAT1162
12V, 1.5A Step-Down DC/DC Converter
Ordering Information
Package
Marking1
Part Number (Tape and Reel)2
TDFN34-16
YYXYY
AAT1162IRN-0.6-T1
All AnalogicTech products are offered in Pb-free packaging. The term “Pb-free” means
semiconductor products that are in compliance with current RoHS standards, including
the requirement that lead not exceed 0.1% by weight in homogeneous materials. For more
information, please visit our website at http://www.analogictech.com/pbfree.
Package Information
TDFN34-16
1.600 ± 0.050
0.35 REF
0.450 ± 0.050
0.230 ± 0.050
4.000 ± 0.050
Index Area
2.350 ± 0.050
0.700 ± 0.050
3.000 ± 0.050
0.25 REF
0.430 ± 0.050
1.600 ± 0.050
Top View
0.750 ± 0.050
Bottom View
0.230 ± 0.050
0.050 ± 0.050
Side View
All dimensions in millimeters.
1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
1162.2007.09.1.2
15
AAT1162
12V, 1.5A Step-Down DC/DC Converter
© Advanced Analogic Technologies, Inc.
AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work
rights, or other intellectual property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service without notice. Except as provided in AnalogicTech’s terms and conditions of sale, AnalogicTech assumes no liability whatsoever, and AnalogicTech disclaims any express or implied warranty relating to the sale and/or use of AnalogicTech products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent,
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customer to minimize inherent or procedural hazards. Testing and other quality control techniques are utilized to the extent AnalogicTech deems necessary to support this warranty.
Specific testing of all parameters of each device is not necessarily performed. AnalogicTech and the AnalogicTech logo are trademarks of Advanced Analogic Technologies Incorporated.
All other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders.
Advanced Analogic Technologies, Inc.
830 E. Arques Avenue, Sunnyvale, CA 94085
Phone (408) 737-4600
Fax (408) 737-4611
16
1162.2007.09.1.2
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