amc3202 ADDtek Corp, amc3202 Datasheet - Page 3

• Manufacturer Part Number: amc3202
• Description: 1.5a 280khz Boost Regulators
• Manufacturer: ADDtek Corp

Copyright © 2006 ADDtek Corp.
Maximum Power Calculation:
The maximum power dissipation for a single-output regulator is:
Exposed
Number
Thermal Resistance from Junction to Ambient, θ
Junction Temperature Calculation: T
The θ
Connect the ground pin to ground using a large pad or ground plane for better heat dissipation.
All of the above assume no ambient airflow.
Pad
Pin
1
2
3
4
5
6
7
8
P
P
D(MAX)
D(MAX)
JA
T
T
θ
JA
J
A
numbers are guidelines for the thermal performance of the device/pc-board system.
(
(
°
(
°
°
Where: V
C):
=
C):
O
= [(V
Then
C /W):
Pin Name
Heat Pad
(PGND)
AGND
COMP
PGND
T
VCC
V
J(MAX)
IN(MAX)
EN
FB
SS
SW
Maximum recommended junction temperature
Ambient temperature of the application
I
I
V
θ
OUT(NOM)
Q
JA
Junction-to-Ambient thermal resistance of the package, and other heat dissipating materials.
OUT(NOM)
IN(MAX)
θ
= the quiescent current the regulator consumes at I
– T
= (+150
JA
- V
A(MAX)
= the maximum input voltage
OUT(NOM)
= the nominal output current, and
= the nominal output voltage
compensation. Loop compensation can be implemented by a simple RC network.
Feedback pin. Sense the output voltage and referenced to 1.276V. When the voltage at this
pin falls below 0.4V, chip switching-frequency reduces to a much lower frequency.
Soft Start pin. Left this pin floating if soft start function is not used.
Enable pin. A TTL low will shut down the chip and high enable the chip. This pin may
also be used to synchronize the part to nearly twice the base frequency. If synchronization
is not used, this pin should be either tied high or left floating for normal operation.
Input power supply pin. Supply power to the IC and should have a bypass capacitor
connected to AGND.
Analog ground. Provide a clean ground for the controller circuitry and should not be in
the path of large currents. This pin is connected to the IC substrate.
Power ground. This pin is the ground connection for the emitter of the power switching
transistor. Connection to a good ground plane is essential.
High current switch pin. Connect to the collector of the internal power switch. The open
voltage across the power switch can be as high as 40V. To minimize radiation, use a trace
as short as practical.
Heat pad. Connect to power ground. Must be soldered to electrical ground on PCB.
Loop compensation pin. This pin is the output of the error amplifier and is used for loop
O
C – T
)] × I
A
J
)/P
= T
OUT(NOM)
D
A
+ (P
D
× θ
+ V
JA
IN(MAX)
).
PIN DESCRIPTION
THERMAL DATA
× I
JA
Q
3
OUT(MAX)
Pin Function
DD074_B -- AUGUST 2006
AMC3202
165°C /W