AME8816BEHAADJ AME, AME8816BEHAADJ Datasheet - Page 10

• Manufacturer Part Number: AME8816BEHAADJ
• Description: Low Dropout (LDO) Regulators Adj. 1.5A CMOS
• Manufacturer: AME

Specifications of AME8816BEHAADJ

• Number Of Outputs: 1
• Polarity: Positive
• Input Voltage Max: 7 V
• Output Voltage: 1.5 V to 5 V
• Output Type: Adjustable
• Dropout Voltage (max): 1300 V
• Output Current: 1.5 A
• Load Regulation: 1 %
• Voltage Regulation Accuracy: 1.5 %
• Maximum Power Dissipation: 2.5 W
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SO-8
• Minimum Operating Temperature: - 40 C
• Reference Voltage: 1.261 V
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

AME8816
n Detailed Description
PMOS pass transistor, voltage reference, error amplifier,
over-current protection, and thermal shutdown.
error amplifier, over-current shutdown, and thermal pro-
tection circuits. During normal operation, the error ampli-
fier compares the output voltage to a precision reference.
Over-current and Thermal shutdown circuits become ac-
tive when the junction temperature exceeds 140
the current exceeds 2.2A. During thermal shutdown, the
output voltage remains low. Normal operation is restored
when the junction temperature drops below 120
load reaches 2.2A. However, if the load impedance drops
below 0.3 ohms, the current drops back to 600mA to
prevent excessive power dissipation. Normal operation
is restored when the load resistance exceeds 0.75 ohms.
n External Capacitors
ground of 4.7 F or greater. Ceramic capacitors have the
lowest ESR, and will offer the best AC performance. Con-
versely, Aluminum Electrolytic capacitors exhibit the high-
est ESR, resulting in the poorest AC response. Unfortu-
nately, large value ceramic capacitors are comparatively
expensive. One option is to parallel a 0.1 F ceramic
capacitor with a 10 F Aluminum Electrolytic. The benefit
is low ESR, high capacitance, and low overall cost.
put and ground to stabilize Vin. The input capacitor should
be at least 0.1 F to have a beneficial effect.
PASS pin and GND. This capacitor can be a low cost
Polyester Film variety between the value of 0.001 ~
0.01 F. A larger capacitor improves the AC ripple rejec-
tion, but also makes the output come up slowly. This
"Soft" turn-on is desirable in some applications to limit
turn-on surges.
the pins. A "Quiet" ground termination is desirable. This
can be achieved with a "Star" connection.
10
The AME8816 family of CMOS regulators contain a
The P-channel pass transistor receives data from the
The AME8816 behaves like a current source when the
The AME8816 is stable with an output capacitor to
A second capacitor is recommended between the in-
A third capacitor can be connected between the BY-
All capacitors should be placed in close proximity to
AME
o
C.
o
C, or
n Enable
and all internal circuits are powered down. In this state,
the quiescent current is less than 1 A. This pin behaves
much like an electronic switch.
and EN pin when V
(Note: There is no internal pull-up for EN PIN.)
n Adjustable Version
tors to generate an output voltage anywhere from 1.5V to
5.0V. Vadj is trimmed to 1.242V and VOUT is given by
the equation:
to keep quiescent current low, but increasing R1 + R2
will reduce stability. In general, R1 and R2 in the 10’s of
k will produce adequate stability, given reasonable lay-
out precautions. To improve stability characteristics, keep
parasitics on the ADJ pin to a minimum, and lower R1
and R2 values.
When pulled low, the PMOS pass transistor shuts off,
100Kohm resistor is necessary between V
The adjustable version uses external feedback resis-
Feedback resistors R1 and R2 should be high enough
VOUT = Vadj ( 1 + R1 / R2 )
EN
is higher than V
1.5A CMOS LDO
IN
.
EN
Rev. H.04
source