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AME5286 데이터시트 PDF




AME에서 제조한 전자 부품 AME5286은 전자 산업 및 응용 분야에서
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부품번호 AME5286 기능
기능 Rectified Step-Down Converter
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AME5286 데이터시트, 핀배열, 회로
AME
AME5286
3A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
n General Description
n Typical Application
The AME5286 is a Synchronous Rectified Step-Down
Converter with internal power MOSFETs. It achieves 3A
continuous output current over a wide switching frequency
range with excellent load and line regulation.
Current mode operation provides fast transient response
and eases of loop stabilization. The circuit protection
includes cycle-by-cycle current limiting, output short cir-
cuit frequency protection and thermal shutdown. In shut-
down mode, the regulator reduces the current less than
1µA of supply current.
V IN
5V
CIN
10µF
P.G
C2
Optional
IN SW
R4
100K
AME5286
PGOOD
EN
OFF ON
FB
SS
COMP FREQ
C1
680pF
GND
R3
25K
RFREQ
18K
L
2.2µH
R1
75K
C3
0.1µF
VOUT
3.3V
COUT
22µF
R2
24K
This device is available in SOP-8/PP and DFN-8C pack-
age with exposed pad for low thermal resistance.
n Features
l 3A Output Current
l External Soft Start
l Stable with Low ESR Output Ceramic
Capacitors
l Up to 95% Efficiency
l Less than 1µA Shutdown Current
l Wide Switching Frequency Range from
300KHz~2MHz
l Thermal Shutdown
l Cycle by Cycle Over Current Protection
l Output Adjustable from 0.8V to VIN
l Short Circuit Protection
l Available in SOP-8, DFN-8C Package
l RoHS Compliant and Halogen Free
Figure 1.
3.3V at 3A Step-Down Regulators
L
VIN 1.5µH
5V
IN SW
CIN
10µF
R4
100K
AME5286
PGOOD
FB
EN
P.G OFF ON
SS
COMP FREQ
C2
Optional
C1
680pF
GND
R3
8.2K
RFREQ
18K
R1
6K
C3
0.1µF
VOUT
1V
COUT
22µF
R2
24K
Figure 2.
1V at 3 A Step-Down Regulators
n Applications
l TV
l Distributed Power Systems
l Pre-Regulator for Linear Regulators
Rev. A.02
1




AME5286 pdf, 반도체, 판매, 대치품
AME
AME5286
n Ordering Information
3A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
AME5286 - x x x xxx
Output Voltage
Number of Pins
Package Type
Pin Configuration
Pin Configuration
Package Number of Output Voltage
Type
Pins
A 1. COMP
(SOP-8/PP) 2. SS
3. EN
4. IN
5. SW
6. FREQ
7. FB
8. PG
9. GND
A 1. COMP
(DFN-8C) 2. SS
3. EN
4. IN
5. SW
6. FREQ
7. FB
8. PG
9. GND
V: DFN
Z: SOP/PP
A: 8
ADJ: Adjustable
4 Rev. A.02

4페이지










AME5286 전자부품, 판매, 대치품
AME
AME5286
3A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
n Detailed Description
Normal Operation
The AME5286 uses a user adjustable frequency, cur-
rent mode step-down architecture with internal MOSFET
switch. During normal operation, the internal high-side
(PMOS) switch is turned on each cycle when the oscilla
for sets the SR latch, and turned off when the comparator
resets the SR latch. The peak inductor current at which
comparator resets the SR latch is controlled by the out-
put of error amplifier EA. While the high-side switch is
off, the low-side switch turns on until either the inductor
current starts to reverse or the beginning of the next
switching cycle.
Dropout Operation
The output voltage is dropped from the input supply for
the voltage which across the high-side switch. As the
input supply voltage decreases to a value approaching
the output voltage, the duty cycle increases toward the
maximum on-time. Further reduction of the supply volt-
age forces the high-side switch to remain on for more
than one cycle until it reaches 100% duty cycle.
Power Good Output
The AME5286 power good output is an open-drain out-
put and requires a pull up resistor. When the output volt-
age is 12.5% above or 12.5% below its set voltage,
PGOOD will be pulled low. It is held low until the output
voltage returns to within the allowed tolerances once more.
During soft-start, PGOOD is actively held low and is only
allowed to transition high when soft-start is over and the
output voltage reaches 87.5% of its set voltage.
Soft-Start
The AME5286 contains an external soft-start clamp that
gradually raises the output voltage. The soft-start timing
is programmed by the external capacitor between SS pin
and GND. The chip provides an internal charge current
for the external capacitor. If 10nF capacitor is used to set
the soft-start, the period will be 800uS(typ.).
Hiccup Mode
During hiccup mode, the AME5286 disables the high-
side MOSFET and begins a cool down period of 8000uS
. At the conclusion of this cool down period, the regula-
tor performs an external 800uS identical to the soft start
at turn-on. ( If 10nF capacitor is used to set the soft-start)
Under Voltage Protection
Under Voltage Protection will activate once the feed-
back voltage falls below 0.4V, the operating frequency is
switched to 1/10 of normal switching frequency and after
four-times hiccup mode counted, the internal high-side
power switch will be turned off, and latched, Unless Re-
start the power supply.
Over Current Protection
The AME5286 cycle-by-cycle limits the peak inductor
current to protect embedded switch from damage. Hence
the maximum output current (the average of inductor cur-
rent) is also limited. In case the load increases, the in-
ductor current is also increase. Whenever the current
limit level is reached, the output voltage can not be regu-
lated and starting to drop.
Over Temperature Protectiion
The in most applications the AME5286 does not dissi-
pate much heat due to high efficiency. But, in applica-
tions where the AME5286 is running at high ambient tem-
perature with low supply voltage and high duty cycles,
such as in dropout, the heat dissipated may exceed the
maximum junction temperature of the part. If the junc-
tion temperature reaches approximately 160oC, the inter-
nal high-side power switch will be turned off and the SW
switch will become high impedance.
Rev. A.02
7

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