AAT1162 [ANALOGICTECH]
12V, 1.5A Step-Down DC/DC Converter; 12V ， 1.5A降压型DC / DC转换器
| 型号： | AAT1162 |
| 厂家： | 
ADVANCED ANALOGIC TECHNOLOGIES |
| 描述： | 12V, 1.5A Step-Down DC/DC Converter |
| 文件： | 总16页 (文件大小：626K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AAT1162
12V, 1.5A Step-Down DC/DC Converter
™
SwitchReg
General Description
Features
The AAT1162 is an 800kHz high efficiency step-
down 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-pow-
ered industrial applications. The internal power
switches are capable of delivering up to 1.5A to the
load.
•
•
•
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
•
•
•
•
•
•
•
•
•
•
The AAT1162 is a highly integrated device, simpli-
fying system-level design. Minimum external com-
ponents are required for the converter.
Short-Circuit and Over-Temperature Protection
Minimum External Components
TDFN34-16 Package
The AAT1162 optimizes efficiency throughout the
entire load range. It operates in a combination
PWM/Light Load mode for improved light-load effi-
ciency. The high switching frequency allows the use
of small external components. The low current shut-
down feature disconnects the load from VIN and
drops shutdown current to less than 1µA.
Temperature Range: -40°C to +85°C
Applications
•
•
•
•
•
•
•
Distributed Power Systems
Industrial Applications
Laptop Computers
The AAT1162 is available in a Pb-free, space-sav-
ing, thermally-enhanced 16-pin TDFN34 package-
and is rated over an operating temperature range
of -40°C to +85°C.
Portable DVD Players
Portable Media Players
Set-Top Boxes
TFT LCD Monitors and HDTVs
Typical Application
Output:
0.6V min,
1.5A max
L
Input:
4.0V ~ 13.2V
IN
LX
FB
2.2ꢀH
EN
CIN
DGND
AIN
AAT1162
COUT
47ꢀF
PGND
COMP
LDO
AGND
1162.2007.09.1.2
1
AAT1162
12V, 1.5A Step-Down DC/DC Converter
Pin Descriptions
Pin #
Symbol Function
1, 2, EP2
LX
Power switching node. LX is the drain of the internal P-channel switch and N-channel syn-
chronous 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.
3, 12
4, 5
N/C
IN
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
6, 13,
14, EP1
DGND
AIN
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.
7
8
LDO
FB
9
10
COMP
11
15
AGND
EN
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.
16
PGND
Power ground. Connect AGND to PGND at a single point as close to the IC as possible.
Pin Configuration
TDFN34-16
(Top View)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
PGND
EN
LX
LX
EP2
EP1
N/C
IN
DGND
DGND
N/C
IN
AGND
COMP
FB
DGND
AIN
LDO
2
1162.2007.09.1.2
AAT1162
12V, 1.5A Step-Down DC/DC Converter
1
Absolute Maximum Ratings
Symbol
Description
Value
Units
VIN, VAIN
VLX
VFB
VEN
TJ
Input Voltage
-0.3 to 14
V
V
V
V
°C
LX to GND Voltage
FB to GND Voltage
EN to GND Voltage
-0.3 to VIN + 0.3
-0.3 to VIN + 0.3
-0.3 to VIN + 0.3
-40 to 150
Operating Junction Temperature Range
3
Thermal Information
Symbol
Description
Maximum Power Dissipation
Thermal Resistance
Value
2.7
37
Units
W
°C/W
4
PD
θJA
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
1
Electrical Characteristics
4.0V < VIN < 13.2V. CIN = COUT = 22µF; L = 4.7µH, TA = -40°C to +85°C, unless otherwise noted. Typical val-
ues are at TA = 25°C.
Symbol Description
Conditions
Min Typ
Max
Units
VIN
Input Voltage Range
4.0
13.2
4.0
V
Rising
VUVLO
Input Under-Voltage Lockout
V
Hysteresis
No Load
VEN = GND
0.3
115
IQ
Supply Current
Shutdown Current
Output Voltage Range
Output Voltage Accuracy
200
1
0.94 VIN
2.5
µA
µA
V
ISHDN
VOUT
VOUT
0.6
-2.5
IOUT = 0A to 1.5A
%
∆VOUT
VOUT/∆VIN
/
Line Regulation
Load Regulation
VIN = 4.5V to 13.2V
0.023 0.100
0.4
%/V
%
∆VOUT
/
VIN = 12V, VOUT = 5V,
IOUT = 0A to 1.5A
IOUT
Feedback Reference Voltage
(adjustable version)
VFB
No Load, TA = 25°C
0.59 0.60
0.61
0.2
V
Adjustable Version
Fixed Version
IFBLEAK
FOSC
FB Leakage Current
VOUT = 1.2V
µA
2
PWM Oscillator Frequency
Foldback Frequency
Maximum Duty Cycle
Minimum Turn-On Time
Soft-Start Time
0.6
0.8
200
1
MHz
kHz
%
ns
µs
DC
TON
TS
94
100
200
0.12
0.15
0.06
0.08
93
V
IN = 12V
VIN = 6V
IN = 12V
VIN = 6V
RDS(ON)H
RDS(ON)L
P-Channel On Resistance
N-Channel On Resistance
Ω
V
Ω
η
ILIM
ILXLEAK
Efficiency
PMOS Current Limit
LX Leakage Current
VIN = 12V, VOUT = 5V, IOUT = 1.5A
%
A
µA
2.0
3.0
VIN = 13.2V, VLX = 0 to VIN
1
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
1
Electrical Characteristics
4.0V < VIN < 13.2V. CIN = COUT = 22µF; L = 4.7µH, TA = -40°C to +85°C, unless otherwise noted. Typical val-
ues are at TA = 25°C.
Symbol Description
Conditions
Min Typ Max Units
Over-Temperature Shutdown
Threshold
Over-Temperature Shutdown
Hysteresis
TSD
140
25
°C
°C
THYS
VIL
VIH
IEN
EN Logic Low Input Threshold
EN Logic High Input Threshold
EN Input Current
0.4
1.0
V
V
µA
1.4
-1.0
VEN = 0V, VEN = 13.2V
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
(VOUT = 5V)
Efficiency vs. Output Current
(VOUT = 3.3V)
100
90
100
90
80
80
VIN = 12V
VIN = 12V
70
70
VIN = 10V
VIN = 10V
60
60
50
40
30
20
10
0
VIN = 8.4V
50
VIN = 8.4V
VIN = 6V
VIN = 5V
40
VIN = 6V
30
20
10
0
0.001
0.01
0.1
1
10
0.001
0.01
0.1
1
10
Output Current (A)
Output Current (A)
Switching Frequency vs. Temperature
Non-Switching Quiescent Current
vs. Temperature
150
140
130
120
110
100
90
820
815
810
805
800
795
790
785
780
775
770
VIN = 12V
5V
12V
VIN = 5V
80
-40 -30 -20 -10
0
10 20 30 40 50 60 70 80 90
-40 -30 -20 -10
0
10 20 30 40 50 60 70 80 90
Temperature (°C)
Temperature (°C)
Non-Switching Quiescent Current
vs. Input Voltage
Switching Quiescent Current vs. Input Voltage
(VOUT = 5V)
150
140
130
120
110
100
90
220
25°C
85°C
210
85°C
200
25°C
190
180
-40°C
170
-40°C
160
150
80
5
6
7
8
9
10
11
12
6
7
8
9
10
11
12
Input Voltage (V)
Input Voltage (V)
6
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
(VOUT = 3.3V)
On Time vs. Temperature
(VOUT = 3.3V)
1000
900
210
200
800
85°C
700
600
500
400
300
200
100
0
VIN = 5V
190
25°C
180
VIN = 12V
170
-40°C
160
150
-40 -30 -20 -10
0
10 20 30 40 50 60 70 80 90
5
6
7
8
9
10
11
12
Input Voltage (V)
Temperature (°C)
Output Voltage Tolerance vs. Temperature
(VOUT = 3.3V; ILOAD = 1.5A)
Line Regulation
(VOUT = 5V)
1
0.4
0.3
0.2
0.1
0
0.8
0.6
0.4
0.2
0
IOUT= 1.5A
IOUT= 500mA
-0.2
-0.4
-0.6
-0.8
IOUT= 1mA
-0.1
-0.2
-0.3
IOUT = 10mA
IOUT = 100mA
-40 -30 -20 -10
0
10 20 30 40 50 60 70 80 90
6
7
8
9
10
11
12
Temperature (°C)
Input Voltage (V)
Line Regulation
(VOUT = 3.3V)
Load Regulation
(VOUT = 5V)
0.4
0.3
0.2
0.1
0
0.4
0.3
0.2
0.1
0
IOUT = 1A
IOUT = 10mA
IOUT = 1.5A
VIN = 12V
VIN = 10V
VIN = 8.4V
IOUT =100mA
IOUT = 1mA
-0.1
-0.2
-0.3
-0.1
-0.2
-0.3
VIN = 6V
5
6
7
8
9
10
11
12
0.0001
0.001
0.01
0.1
1
10
Input Voltage (V)
Output Current (mA)
1162.2007.09.1.2
7
AAT1162
12V, 1.5A Step-Down DC/DC Converter
Typical Characteristics
Test circuit of Figure 2, unless otherwise specified.
Load Regulation
(VOUT = 3.3V)
N-Channel RDS(ON) vs. Temperature
120
0.4
VIN = 12V
0.3
100
VIN = 6V
VIN = 10V
0.2
80
60
0.1
0
-0.1
-0.2
-0.3
VIN = 8.4V
VIN = 6V
40
VIN = 12V
VIN = 5V
20
0
-40 -30 -20 -10
0
10 20 30 40 50 60 70 80 90
0.0001
0.001
0.01
0.1
1
10
Output Current (mA)
Temperature (°C)
P-Channel RDS(ON) vs. Temperature
Line Transient
(VOUT = 3.3V; CFF = 100pF)
8
7
6
5
4
3
2
1
0
3.48
3.45
3.42
3.39
3.36
3.33
3.3
200
180
160
140
120
100
80
VIN = 6V
VIN
= 12V
60
40
3.27
3.24
20
0
-40 -30 -20 -10
0
10 20 30 40 50 60 70 80 90
Temperature (°C)
Time (20µs/div)
Load Transient
(VOUT = 5V; CFF = 100pF)
Load Transient
(VOUT = 3.3V; CFF = 100pF)
3.6
3.4
3.2
3
3.5
5.2
5
4
3
3.5
3
1A
2.5
2
4.8
4.6
4.4
4.2
4
1.2A
2.5
2
10mA
10mA
2.8
2.6
2.4
2.2
2
1.5
1
1.5
1
0.5
0
3.8
3.6
0.5
0
-0.5
Time (50µs/div)
Time (50µs/div)
8
1162.2007.09.1.2
AAT1162
12V, 1.5A Step-Down DC/DC Converter
Typical Characteristics
Test circuit of Figure 2, unless otherwise specified.
Load Transient
(VOUT = 5V; No CFF)
Load Transient
(VOUT = 3.3V; No CFF)
5.4
5.1
4.8
4.5
4.2
3.9
3.6
3.3
3
4
3.6
3.4
3.2
3
4
3.5
3
3.5
3
1A
1.2A
2.5
2
2.5
2
10mA
2.8
2.6
2.4
2.2
2
10mA
1.5
1
1.5
1
0.5
0
0.5
0
Time (50µs/div)
Time (50µs/div)
1162.2007.09.1.2
9
AAT1162
12V, 1.5A Step-Down DC/DC Converter
Functional Block Diagram
AIN
LDO
IN
Note1
FB
Internal
Power
LDO
Current
Sense Amp
+
-
+
-
+
-
Error
Amp
Control
Logic
Current
Mode
LX
Comparator
Reference
PGND
AGND
EN
DGND
COMP
.
Note1: For fixed output voltage versions, FB is connected to the
error amplifier through the resistive voltage divider shown.
Control Loop
Functional Description
The AAT1162 regulates the output voltage using
constant frequency current mode control. The
AAT1162 monitors current through the high-side P-
channel MOSFET and uses that signal to regulate
the output voltage. This provides improved tran-
sient response and eases compensation. Internal
slope compensation is included to ensure the cur-
rent "inside loop" stability.
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 exter-
nal 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.
High efficiency is maintained under light load con-
ditions by automatically switching to variable fre-
quency Light Load control. In this condition, transi-
tion losses are reduced by operating at a lower fre-
quency at light loads.
10
1162.2007.09.1.2
AAT1162
12V, 1.5A Step-Down DC/DC Converter
Short-Circuit Protection
Applications Information
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 syn-
chronous rectifier is turned on, limiting the inductor
and the load current.
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 volt-
age higher than 0.6V. To limit the bias current
required for the external feedback resistor string
while maintaining good noise immunity, the mini-
mum 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.
During an overload condition, when the output volt-
age 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 cur-
rent ample time to reset during the off time to pre-
vent the inductor current from rising uncontrolled in
a short-circuit condition.
Thermal Protection
The AAT1162 includes thermal protection that dis-
ables the regulator when the die temperature
reaches 140ºC. It automatically restarts when the
temperature decreases by 25ºC or more.
L1
EP2
VOUT
5V, 2A
VIN 4.5V -13.2V
R4
3.8ꢀH
LX
3
4
1
2
LX
LX
FB
EN
IN
C3
100pF
R1
43.2kΩ
10Ω
5
7
C1
22ꢀF
C2
22ꢀF
C6
0.1ꢀF
IN
9
AAT1162
AIN
10
11
R2
5.9kΩ
C7
1ꢀF
COMP
AGND
6
13
16
R3
50kΩ
DGND
14
8
DGND
PGND
DGND
LDO
DGND
EP1
C4
270pF
C5
1ꢀF
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 main-
tain 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:
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 induc-
tor. For optimum voltage-positioning load transients,
choose an inductor with DC series resistance in the
15mꢁ to 20mꢁ range. For higher efficiency at
heavy loads (above 1A), or minimal load regulation
(but some transient overshoot), the resistance
should be kept below 18mꢁ. The DC current rating
of the inductor should be at least equal to the max-
imum load current plus half the ripple current to pre-
vent core saturation (1.5A + 263mA). Table 2 lists
some typical surface mount inductors that meet tar-
get applications for the AAT1162.
⎛
R1⎞
R2⎠
V
OUT = 0.6V 1 +
⎝
or
V
⎛
⎝
⎞
-1 · R2
⎠
OUT
R1 =
V
REF
Table 1 shows the resistor selection for different
output voltage settings.
R2 = 5.9(kΩ)
R1 (kΩ)
R2 = 59(kΩ)
R1 (kΩ)
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 loss-
es 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 3.7ꢀH 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 effi-
ciency for a 1.5A, 5V output.
VOUT (V)
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
Compensation
The AAT1162 step-down converter uses peak cur-
rent mode control with slope compensation
scheme to maintain stability with lower value induc-
tors for duty cycles greater than 50%. The regula-
tion feedback loop in the IC is stabilized by the
components connected to the COMP pin, as
shown in Figure 1.
Table 1: Resistor Selection for Different Output
Voltage Settings. Standard 1% Resistors are
Substituted for Calculated Values.
12
1162.2007.09.1.2
AAT1162
12V, 1.5A Step-Down DC/DC Converter
Max DCR
(mΩ)
Rated DC
Size WxLxH
(mm)
Manufacturer
Part Number
L (µH)
Current (A)
Sumida
Sumida
Coilcraft
CDRH103RNP-2R2N
CDR7D43MNNP-3R7NC
MSS1038-382NL
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.
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 min-
imum. This will help to minimize any error in
DC regulation due to differences in the poten-
tial of the internal signal ground and the power
ground.
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 sol-
dered 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
13
AAT1162
12V, 1.5A Step-Down DC/DC Converter
Enable
1
J1
EP2
U1
AAT1162
VIN
VOUT
L1
R5 4.7k
LX
15
4
1
2
FB1 1.5A 330
EN
IN
LX
LX
FB
3.8ꢀH 6A
C10
100pF
5
3
9
10
R1
C9
IN
43.2k
0.1ꢀF
16V
N/C
AIN
COMP
R4
10
7
11
12
AGND
R3
C11
NP
C3
22ꢀF
C3
22ꢀF
C3
22ꢀF
N/C
51k
6
13
R2
5.9k
DGND
DGND
PGND
14
8
C1
22ꢀF
16V
C2
10ꢀF
16V
DGND
LDO
C7
270pF
16
LDO
DGND
C8
0.1ꢀF
16V
EP1
C6
1ꢀF
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.
Figure 4: AAT1162 Evaluation Board
Solder Side Layout.
14
1162.2007.09.1.2
AAT1162
12V, 1.5A Step-Down DC/DC Converter
Ordering Information
1
2
Package
Marking
Part Number (Tape and Reel)
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
3.000 0.050
Index Area
0.25 REF
0.430 0.050
1.600 0.050
Top View
Bottom View
0.050 0.050
0.230 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 with-
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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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