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PDF AAT1162 Data sheet ( Hoja de datos )
| Número de pieza | AAT1162 | |
| Descripción | Step-Down DC/DC Converter | |
| Fabricantes | AAT | |
| Logotipo |  |
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AAT1162
12V, 1.5A Step-Down DC/DC Converter
General Description
Features
SwitchReg™
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.
The AAT1162 is a highly integrated device, simpli-
fying system-level design. Minimum external com-
ponents 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 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.
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.
Typical Application
• 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
• Distributed Power Systems
• Industrial Applications
• Laptop Computers
• Portable DVD Players
• Portable Media Players
• Set-Top Boxes
• TFT LCD Monitors and HDTVs
Input:
4.0V ~ 13.2V
CIN
IN
EN
DGND
AIN AAT1162
LX
FB
COMP
LDO
PGND
AGND
L
2.2µH
Output:
0.6V min,
1.5A max
COUT
47µF
1162.2007.06.1.1
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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 val-
ues 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
VEN = 0V, VEN = 13.2V
Min Typ Max Units
140 °C
25 °C
0.4 V
1.4 V
-1.0 1.0 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.
1162.2007.06.1.1
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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 syn-
chronous rectifier is turned on, limiting the inductor
and the load 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.
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 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.
VIN 4.5V -13.2V
C1
22µF
R4
10Ω
C6
0.1µF
C7
1µF
EP2
3 EN
4
IN
5
IN
7
AIN
LX LX 1
LX 2
AAT1162 FB 9
COMP 10
6 DGND
AGND 11
13
DGND
16
PGND
DGND 14
8
DGND LDO
EP1 C5
1µF
L1
3.8µH
C3
100pF
R3
50kΩ
C4
270pF
VOUT
5V, 2A
R1
43.2kΩ C2
22µF
R2
5.9kΩ
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.
1162.2007.06.1.1
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet AAT1162.PDF ] | |
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