AAT1185 Datasheet, PDF (1/16 Pages) Skyworks Solutions Inc. – High Voltage Step-Down Controller

General Description
The AAT1185 is a single output step-down (Buck) regu-
lator controller with an input range of 6V to 24V. The
output range is adjustable from 0.8V to 5.5V.
The device provides high and low-side pins to drive
external n-channel MOSFETs; allowing fully synchronous
operation for maximum efficiency and performance.
Alternately, the low-side MOSFET may be replaced with
a Schottky rectifier. Both high and low-side drive pins are
compatible with a wide range of external MOSFETs mak-
ing the device the ideal control solution for low power
and high power configurations.
Voltage mode control allows for optimum performance
across the entire output voltage and load range. The
490kHz fixed switching frequency allows wide range of
L/C filtering components, achieving smallest size and
maximum efficiency. External compensation allows the
designer to optimize the transient response.
The controller includes programmable over-current, inte-
grated soft-start and over-temperature protection.
The AAT1185 is available in the Pb-free, 14-pin TSOPJW
package. The rated operating temperature range is
-40°C to 85°C.
DATA SHEET
AAT1185
High Voltage Step-Down Controller
Features
 V_IN = 6.0V to 24.0V
 V_OUT Adjustable from 0.8V to 5.5V
 I_OUT from <1A up to 10A
 Small Solution Size
 Ultra-small External L/C
 Synchronous or Non-Synchronous
 Shutdown Current <30μA
 High Switching Frequency
 Voltage Mode Control
 PWM Fixed Frequency for Lowest Noise
▪ ^{Programmable Over-Current Protection}
 Over-Temperature Protection
 Internal Soft Start
 2.85x3mm TSOPJW-14 Package
 -40°C to 85°C Temperature Range
Applications
• DSL and Cable Modems
• Notebook Computers
• Satellite Set Top Boxes
• Wireless LAN Systems
Typical Application
VIN
6V - 24V
C7
2.2μF
D1
BAS16
C3
470μF
25V
C5
10μF
25V
U1
BST
VCC
DH
AAT1185
HV
LX
EN
DL
RS
R1
3.32
R2
3.32
C8
0.1μF
Q1
Q2
PGND _OS
COMP ^FB
TSOPJW-14
R4
20K
L1
3.9μH
R3
1.74K
C9
0.47μF
C10
33pF
C11
680pF
VOUT
3.3V/10A
R5
R6
1K
27.4K
C12
680pF
C13, C14
2×47μF
R7
6.04k
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
202001A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 31, 2012
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