MAX8530ETTK2-T Maxim Integrated Products, MAX8530ETTK2-T Datasheet - Page 8

• Manufacturer Part Number: MAX8530ETTK2-T
• Description: Low Dropout (LDO) Regulators Dual Low-Dropout Linear Regulator
• Manufacturer: Maxim Integrated Products

Specifications of MAX8530ETTK2-T

• Number Of Outputs: 2
• Polarity: Positive
• Input Voltage Max: 6.5 V
• Output Voltage: 2.8 V, 1.8 V
• Output Type: Fixed
• Dropout Voltage (max): 0.2 V at 100 mA
• Output Current: 200 mA, 150 mA
• Line Regulation: 0.2 % / V
• Voltage Regulation Accuracy: 1%
• Maximum Power Dissipation: 1.951 W
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: TQFN-6 EP
• Minimum Operating Temperature: - 40 C

Use a 2.2µF capacitor on the MAX8530/MAX8531s’
inputs. Larger input capacitor values with lower ESRs
provide better supply-noise rejection and line-transient
response. To reduce noise and improve load transients,
use large-output capacitors, up to 10µF. For stable
operation over the full temperature range and with rated
maximum load currents, use a minimum of 2.2µF (or
1µF for <150mA loading for OUT1) and 1µF for OUT2.
Note that some ceramic dielectrics exhibit large capac-
itance and ESR variation with temperature. With
dielectrics such as Z5U and Y5V, it is necessary to use
4.7µF or more to ensure stability at temperatures below
-10°C. With X7R or X5R dielectrics, 2.2µF is sufficient at
all operating temperatures. These regulators are opti-
mized for ceramic capacitors. Tantalum capacitors are
not recommended.
The MAX8530/MAX8531 is designed to deliver low
dropout voltages and low quiescent currents in battery-
powered systems. Power-supply rejection is 60dB at
low frequencies (see the Power-Supply Rejection Ratio
vs. Frequency graph in the Typical Operating Char-
acteristics).
When operating from sources other than batteries,
improve supply-noise rejection and transient response
by increasing the values of the input and output bypass
capacitors and through passive filtering techniques.
The MAX8530/MAX8531 load-transient response
graphs (see the Typical Operating Characteristics)
show two components of the output response: a DC
shift in the output voltage because of the different load
Dual Low-Dropout Linear Regulators
with RESET or Low-Noise Output in UCSP or QFN
8
_______________________________________________________________________________________
Applications Information
Load-Transient Considerations
Sources Other than Batteries
PSRR and Operation from
and Regulator Stability
Capacitor Selection
currents, and the transient response. Increase the output
capacitor’s value and decrease its ESR to attenuate
transient spikes.
A regulator’s minimum input/output voltage differential
(or dropout voltage) determines the lowest usable supply
voltage. In battery-powered systems, this determines
the useful end-of-life battery voltage. Because the
MAX8530/MAX8531 use a P-channel MOSFET pass
transistor, their dropout voltage is a function of drain-to-
source on-resistance (R
current (see the Typical Operating Characteristics).
The maximum output power of the MAX8530/MAX8531
can be limited by the maximum power dissipation of the
package. Obtain the maximum power dissipation by
calculating the power dissipation of the package as a
function of the input voltage, output voltage, and output
currents. The maximum power dissipation should not
exceed the package’s maximum power rating:
where:
V
P
(308mW for UCSP and 1951mW for the QFN package)
V
V
I
I
P should be less than P
consider using the QFN package.
OUT1
OUT2
IN(MAX)
OUT1
OUT2
MAX
= Maximum output current of OUT1
= Maximum output current of OUT2
= Maximum power dissipation of the package
= Output voltage of OUT1
= Output voltage of OUT2
= Maximum input voltage
P = (V
(V
Input/Output (Dropout Voltage)
IN(MAX)
IN(MAX)
Calculating the Maximum
MAX
DS(ON)
- V
- V
Output Power in UCSP
OUT2
OUT1
. If P is greater than P
) multiplied by the load
) x I
) x I
OUT1
OUT2
+
MAX
,