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參數(shù)資料
| 型號： | AAT2504 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 英文描述： | Adjustable 3-Channel Regulator |
| 中文描述： | 可調(diào)節(jié)的3通道穩(wěn)壓器 |
| 文件頁數(shù)： | 11/22頁 |
| 文件大小： | 948K |
| 代理商： | AAT2504 |
AAT2504
Adjustable 3-Channel Regulator
2504.2007.06.1.0
11
Functional Block Diagram
EN
VLDOA
OUTB
MODE/SYNC
POK
LX
Logic
DH
DL
PGND
VP
AGND
OUTA
VLDOB
FBB
FBA
ENA
ENB
VIN
Control
Logic
Voltage
Reference
Voltage
Reference
90%
V
REF
Err.
Amp.
Err.
Amp.
E
A
Over-Current
Protection
O
P
FB
Functional Description
The AAT2504 is a high performance power man-
agement IC comprised of a step-down converter
and two linear regulators. The step-down convert-
er operates in both fixed and variable frequency
modes for high efficiency performance. The switch-
ing frequency is 2MHz, minimizing the size of the
inductor. The converter requires only three external
power components (C
IN
, C
OUT
, and L). Each LDO
can deliver up to 300mA. Each regulator has inde-
pendent input voltage and enable pins and oper-
ates with ceramic capacitors.
Switch-Mode Step-Down Converter
The switching regulator is a monolithic step-down
converter operating with input voltage range of 2.7V
to 5.5V. Power devices are sized for 800mA current
capability and achieves over 95% efficiency. The
internal oscillator operates at 2MHz, minimizing the
cost and size of external components. Light Load
operation maintains high efficiency under light load
conditions (typically <50mA) when MODE/SYNC is
grounded. The MODE/SYNC pin tied high allows
optional "PWM Only" operation. This maintains con-
stant frequency and low output ripple across all load
conditions. Alternatively, by connecting an external
clock to the AAT2504's MODE/SYNC pin, the inter-
nal clock is disabled. The external synchronization
must stay between 1MHz and 3MHz.
The current through the P-channel MOSFET (high
side) is sensed for current loop control, as well as
short-circuit and overload protection. A fixed slope
compensation signal is added to the sensed current
to maintain stability for duty cycles greater than
50%. The peak current mode loop appears as a
voltage-programmed current source in parallel with
the output capacitor.
The output of the voltage error amplifier programs
the current mode loop for the necessary peak
switch current to force a constant output voltage for
all load and line conditions. Internal loop compen-
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| AAT2504_08 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Adjustable 3-Channel Regulator |
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| AAT2505 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Dual Channel, Step-Down Converter/Linear Regulator |
| AAT2505IWP-AO-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Dual Channel, Step-Down Converter/Linear Regulator |
| AAT2505IWP-AQ-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Dual Channel, Step-Down Converter/Linear Regulator |
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