參數(shù)資料
型號(hào)： AAT2506IWP-AI-T1
廠商： Advanced Analog Technology,lnc.
英文描述： 1MHz Step-Down Converter/LDO Regulator
中文描述： 1MHz的降壓轉(zhuǎn)換器/ LDO穩(wěn)壓器
文件頁(yè)數(shù)： 14/26頁(yè)
文件大?。?/td> 697K
代理商： AAT2506IWP-AI-T1
AAT2506
1MHz Step-Down Converter/LDO Regulator
14
2506.2006.05.1.3
Low Dropout Operation
For conditions where the input voltage drops to the
output voltage level, the converter duty cycle
increases to 100%. As 100% duty cycle is
approached, the minimum off-time initially forces
the high side on-time to exceed the 1MHz clock
cycle and reduce the effective switching frequency.
Once the input drops below the level where the out-
put can be regulated, the high side P-channel
MOSFET is turned on continuously for 100% duty
cycle. At 100% duty cycle, the output voltage tracks
the input voltage minus the IR drop of the high side
P-channel MOSFET R
DS(ON)
.
Low Supply
The under-voltage lockout (UVLO) guarantees suf-
ficient V
IN
bias and proper operation of all internal
circuitry prior to activation.
Fault Protection
For overload conditions, the peak inductor current is
limited. Thermal protection disables switching when
the internal dissipation or ambient temperature
becomes excessive. The junction over-temperature
threshold is 140°C with 15°C of hysteresis.
Applications Information
Linear Regulator
Input and Output Capacitors:
An input capacitor
is not required for basic operation of the linear reg-
ulator. However, if the AAT2506 is physically locat-
ed more than three centimeters from an input
power source, a C
IN
capacitor will be needed for
stable operation. Typically, a 1μF or larger capaci-
tor is recommended for C
IN
in most applications.
C
IN
should be located as closely to the device V
IN
pin as practically possible.
An input capacitor greater than 1μF will offer supe-
rior input line transient response and maximize
power supply ripple rejection. Ceramic, tantalum,
or aluminum electrolytic capacitors may be select-
ed for C
IN
. There is no specific capacitor ESR
requirement for C
IN
. However, for 300mA LDO reg-
ulator output operation, ceramic capacitors are rec-
ommended for C
IN
due to their inherent capability
over tantalum capacitors to withstand input current
surges from low impedance sources such as bat-
teries in portable devices.
For proper load voltage regulation and operational
stability, a capacitor is required between OUT and
GND. The C
OUT
capacitor connection to the LDO
regulator ground pin should be made as directly as
practically possible for maximum device perform-
ance. Since the regulator has been designed to
function with very low ESR capacitors, ceramic
capacitors in the 1.0μF to 10μF range are recom-
mended for best performance. Applications utilizing
Figure 1: AAT2506 Fixed Output.
Figure 2: AAT2506 with Adjustable Step-Down
Output and Enhanced Transient Response.
L1
22
μ
F
C1
V
IN
R1
59k
R2
4.7
μ
F
C4
10
μ
F
C3
10nF
C5
V
OUTLDO
V
OUTBUCK
100pF
C8
PGND
1
LX
2
VP
3
VCC
4
ENLDO
9
EN
10
FB
11
SGND
12
VLDO
5
OUT
6
GND
8
BYP
7
AAT2506
U1
L1
22
μ
F
C1
V
OUTBUCK
V
IN
4.7
μ
F
C4
10
μ
F
C3
10nF
C5
V
OUTLDO
PGND
1
LX
2
VP
3
VCC
4
ENLDO
9
EN
10
FB
11
SGND
12
VLDO
5
OUT
6
GND
8
BYP
7
AAT2506
U1
相關(guān)PDF資料
PDF描述
AAT2506IWP-AN-T1 1MHz Step-Down Converter/LDO Regulator
AAT2506IWP-AQ-T1 1MHz Step-Down Converter/LDO Regulator
AAT2506IWP-AW-T1 1MHz Step-Down Converter/LDO Regulator
AAT2511 Dual 600mA, 1MHz Step-Down DC/DC Converter
AAT2511_0605 Dual 600mA, 1MHz Step-Down DC/DC Converter
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AAT2506IWP-AN-T1 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:1MHz Step-Down Converter/LDO Regulator
AAT2506IWP-AQ-T1 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:1MHz Step-Down Converter/LDO Regulator
AAT2506IWP-AW-T1 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:1MHz Step-Down Converter/LDO Regulator
AAT2510 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Dual 400mA, 1MHz Step-Down DC-DC Converter
AAT2510_06 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Dual 400mA, 1MHz Step-Down DC-DC Converter
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