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參數(shù)資料
| 型號： | AAT1217ICA-3.3-T1 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 英文描述： | 600mA, 1.2MHz, Micropower Synchronous Step-Up Converter |
| 中文描述： | 600mA的，1.2MHz的，微功耗同步升壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 7/13頁 |
| 文件大小： | 292K |
| 代理商： | AAT1217ICA-3.3-T1 |
Functional Block Diagram
C
OUT
R1
R2
PWM
Logic
Shutdown
Control
+
–
Comp
–
EA
+
V
OUT
GND
SHDN
FB
VOUT
Oscillator
1.2MHz
Antiringing
Control
Bandgap
1.23V
Start-Up
Oscillator
+
–
VOUT
GOOD
MUX
Current
Sense
Slope
Compensation
To V
IN
2.3V
L1
V
IN
VIN
SW
–
+
C
IN
AAT1217
600mA, 1.2MHz, Micropower
Synchronous Step-Up Converter
1217.2007.07.1.0
7
Functional Description
TheAAT1217 is a synchronous step-up DC-DC con-
verter. It utilizes internal MOSFET switches to
achieve high efficiency over the full load current
range. It operates at a fixed switching frequency of
1.2MHz, and uses the slope compensated current
mode pulse width modulation (PWM) architecture.
The device can operate with an input voltage below
1V; the typical start-up voltage is 0.85V.
Synchronous Rectification
The AAT1217 integrates a synchronous rectifier to
improve efficiency as well as to eliminate the need
for an external Schottky diode. The synchronous
rectifier is used to reduce the conduction loss con-
tributed by the forward voltage of an external
Schottky diode. The synchronous rectifier is real-
ized by a P-channel MOSFET (PMOS) with gate
control circuitry that incorporates relatively compli-
cated timing concerns. An external Schottky diode
is required when the output voltage is greater than
4.5V.
Low Voltage Start-Up
The AAT1217 can start-up with supply voltages
down to 0.85V. During start-up, the internal low
voltage start-up circuitry controls the internal
NMOS switch. The AAT1217 leaves the start-up
mode once V
OUT
exceeds 2.3V. An internal com-
parator (VOUT GOOD) monitors the output voltage
and places the chip into normal operation once
V
OUT
exceeds 2.3V. The AAT1217’s control circuit-
ry is biased by V
IN
during start-up and biased by
V
OUT
once V
OUT
exceeds V
IN
. When V
OUT
exceeds
V
IN
, the AAT1217’s operation will be independent
of V
IN
.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT1217ICA-5.0-T1 | 制造商:Skyworks Solutions Inc 功能描述:DC TO DC CONVERTER |
| AAT1217IGU-3.3-T1 | 制造商:Skyworks Solutions Inc 功能描述:DC TO DC CONVERTER |
| AAT1218 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:1A, 1.2MHz Synchronous Boost Converter |
| AAT1218ITP-1.2-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:1A, 1.2MHz Synchronous Boost Converter |
| AAT1218ITP-3.3-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:1A, 1.2MHz Synchronous Boost Converter |
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