AME5287 Datasheet, PDF (1/20 Pages) Analog Microelectronics – Rectified Step-Down Converter

AME
AME5287
3A, 300KHz ~ 2MHz Synchronous
Rectified Step-Down Converter
n General Description
The AME5287 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. Internal soft-start mini-
mizes the inrush supply current at startup. The circuit
protection includes cycle-by-cycle current limiting, out-
put short circuit frequency protection and thermal shut-
down. In shutdown mode, the regulator reduces the cur-
rent less than 1µA of supply current.
This device is available in SOP-8/PP ,DFN-8 package
with exposed pad for low thermal resistance.
n Typical Application
L
VIN
2.2µH
5V
IN
SW
C_IN
10µF
C2
Optional
EN
OFF ON _AME5287
C₁
680pF
R₃
25KΩ
COMP
GND
FB
FREQ
RFREQ
18KΩ
R1
75KΩ
R2
24KΩ
V_OUT
3.3V
C_OUT
22µF
Figure 1. 3.3V at 3A Step-Down Regulators.
n Features
l 3A Output Current
l Stable with Low ESR Output Ceramic
Capacitors
l Pre-Regulator for Linear Regulators
l Up to 95% Efficiency
l Less than 1µA Shutdown Current
l Wide Switching Frequency Range from
300KHz~2MHz
l Thermal Protection
l Cycle-by-Cycle Over Current Protection
l Output Adjustable from 0.8V to V_IN
l Short Circuit Protection
l Green Products Meet RoHS Standards
V_IN
3V~5V
CIN
10µF
C2
Optional
L
1.5µH
IN
SW
EN
R1
OFF ON
AME5287
6KΩ
C1
680pF
R3
8.2KΩ
FB
COMP
GND
FREQ
R_FREQ
18KΩ
R2
24KΩ
VOUT
1V
COUT
22µF
Figure 2. 1V at 3A Step-Down Regulators.
n Applications
l TV
l Distributed Power Systems
l Pre-Regulator for Linear Regulators
l Digital Cameras
Rev. A.01
1