參數(shù)資料
型號(hào)： AAT2503IZL-BAA-T1
廠商： Advanced Analog Technology,lnc.
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(yè)數(shù)： 16/23頁(yè)
文件大?。?/td> 1022K
代理商： AAT2503IZL-BAA-T1
AAT2503
Adjustable 3-Channel Regulator
16
2503.2007.04.1.1
Table 2: Step-Down Converter Resistor Values
for Various Output Voltages.
Thermal Calculations
There are three types of losses associated with the
AAT2503 step-down converter: switching losses,
conduction losses, and quiescent current losses.
Conduction losses are associated with the R
DS(ON)
characteristics of the power output switching
devices. Switching losses are dominated by the gate
charge of the power output switching devices. At full
load, assuming continuous conduction mode (CCM),
a simplified form of the LDO losses is given by:
I
Q
is the step-down converter quiescent current.
The term t
sw
is used to estimate the full load step-
down converter switching losses.
For the condition where the step-down converter is
in dropout at 100% duty cycle, the total device dis-
sipation reduces to:
Since R
DS(ON)
, quiescent current, and switching
losses all vary with input voltage, the total losses
should be investigated over the complete input
voltage range.
Given the total losses, the maximum junction tem-
perature can be derived from the
θ
JA
for the
QFN34-20 package which is 50°C/W.
LDO Linear Regulator Input Capacitor
A 1μF or larger capacitor is typically recommended
for C
IN
in most applications. A C
IN
capacitor is not
required for basic LDO regulator operation; howev-
er, if the AAT2503 is physically located more than
three centimeters from an input power source, a
C
IN
capacitor will be needed for stable operation.
C
IN
should be located as closely to the device VIN
pin as practically possible. C
IN
values greater than
1μF will offer superior input line transient response
and will assist in maximizing the highest possible
power supply ripple rejection.
Ceramic, tantalum, or aluminum electrolytic capac-
itors may be selected for C
IN
. There is no specific
capacitor ESR requirement for C
IN
; however, for
150mA LDO regulator output operation, ceramic
capacitors are recommended for C
IN
due to their
inherent capability over tantalum capacitors to with-
stand input current surges from low impedance
sources such as batteries in portable devices.
Output Capacitor
For proper load voltage regulation and operational
stability, a capacitor is required between pins OUTA,
OUTB, and GND. The C
OUT
capacitor connection to
the LDO regulator ground pin should be made as
direct as practically possible for maximum device
performance. The AAT2503 has been specifically
designed to function with very low ESR ceramic
capacitors. For best performance, ceramic capaci-
tors are recommended.
Typical output capacitor values for maximum out-
put current conditions range from 1μF to 10μF.
T
J(MAX)
=
P
TOTAL
·
Θ
JA
+ T
AMB
P
TOTAL
= I
O
2
· R
DSON(HS)
+ I
Q
· V
IN
P
TOTAL
I
O
2
· (R
DSON(HS)
· V
O
+ R
DSON(LS)
· [V
IN
- V
O
])
V
IN
=
+ (t
sw
· F · I
O
+ I
Q
) · V
IN
R6 = 59k
Ω
R2 (k
Ω
)
0
6.65
13.3
19.6
26.1
32.4
39.2
59.0
61.9
71.5
105
124
137
158
R6 = 221k
Ω
R2 (k
Ω
)
0
24.3
48.7
73.2
97.6
124
147
221
232
274
392
464
511
590
V
OUT
(V)
0.9*
1.0
1.1
1.2
1.3
1.4
1.5
1.8
1.85
2.0
2.5
2.8
3.0
3.3
* For the 0.9V output, R6 is open.
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