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參數(shù)資料
| 型號： | AAT1112IWP-0.6-T1 |
| 廠商： | Advanced Analog Technology,lnc. |
| 英文描述： | 1.5A, 1.4MHz Step-Down Converter |
| 中文描述： | 1.5A的，1.4MHz的降壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 10/20頁 |
| 文件大?。?/td> | 828K |
| 代理商： | AAT1112IWP-0.6-T1 |
AAT1112
1.5A, 1.4MHz Step-Down Converter
10
1112.2007.01.1.1
Functional Block Diagram
EN
LX
Err.
Amp
Logic
DH
DL
PGND
FB
GND
Input
V
REF
VIN
VP
MODE/SYNC
Functional Description
The AAT1112 is a high performance 1.5A monolith-
ic step-down converter operating at 1.4MHz switch-
ing frequency. It minimizes external component
size and optimizes efficiency over the complete
load range. Apart from the small bypass input
capacitor, only a small L-C filter is required at the
output. Typically, a 3.3μH inductor and a 22μF
ceramic capacitor are recommended for a 3.3V
output (see table of recommended values).
At dropout, the converter duty cycle increases to
100% and the output voltage tracks the input volt-
age minus the R
DS(ON)
drop of the P-channel high-
side MOSFET (plus the DC drop of the external
inductor). The device integrates extremely low
R
DS(ON)
MOSFETs to achieve low dropout voltage
during 100% duty cycle operation. This is advan-
tageous in applications requiring high output volt-
ages (typically > 2.5V) at low input voltages.
The integrated low-loss MOSFET switches can
provide greater than 95% efficiency at full load.
PFM operation maintains high efficiency under light
load conditions (typically <150mA). The MODE/
SYNC pin allows optional "PWM only" mode. This
maintains constant frequency and low output ripple
across all load conditions. Alternatively, the IC can
be synchronized to an external clock via the
MODE/ SYNC input. External synchronization is
maintained between 0.6MHz and 3.0MHz.
In battery-powered applications, as V
IN
decreases,
the converter dynamically adjusts the operating fre-
quency prior to dropout to maintain the required duty
cycle and provide accurate output regulation.
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