ST2L05-3318K5 STMicroelectronics, ST2L05-3318K5 Datasheet - Page 13

• Manufacturer Part Number: ST2L05-3318K5
• Description: IC VOLT REG DUAL LO QUIES SPAK-5
• Manufacturer: STMicroelectronics

Specifications of ST2L05-3318K5

• Regulator Topology: Positive Fixed
• Voltage - Output: 3.3V, 1.8V
• Voltage - Input: 4.5 ~ 7 V
• Voltage - Dropout (typical): 1.1V @ 1A
• Number Of Regulators: 2
• Current - Output: 1A
• Current - Limit (min): 1A
• Operating Temperature: 0°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: SPak (5 leads + Tab)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ST2L05
change a lot depending on the ambient temperature.The test results of the ST2L05 stability using
multilayer ceramic capacitors show that a minimum value of 2.2µF is needed for both regulators. This
value can be increased without limit if the input capacitor value is major or equal to 4.7µF, and up to 10µF
if the input capacitor is minor than 4.7µF.Surface-mountable solid tantalum capacitors offer a good
combination of small physical size for the capacitance value and ESR in the range needed by the ST2L05.
The test results show good stability for both outputs with values of at least 1µF. The value can be
increased without limit for even better performance such as transient response and noise.
IMPORTANT:
The output capacitor must maintain its ESR in the stable region over the full operating temperature to
assure stability. More over, capacitor tolerance and variations due to temperature must be considered to
assure that the minimum amount of capacitance is provided at all times. For this reason, when a Ceramic
multilayer capacitor is used, the better choice for temperature coefficient is the X7R type, which holds the
capacitance within ±15%. The output capacitor should be located not more than 0.5" from the output pins
of the device and returned to a clean analog ground.
ADJUSTABLE REGULATOR
The ST2L05 has a 1.25V reference voltage between the output and the adjust pins (respectively pin 4 and
2). When a resistor R
is placed between these two terminals, a constant current flows through R
and
1
1
down to R
to set the overall (V
to GND) output voltage. Minimum load current is 2mA max in all
2
O2
temperature conditions.
APPLICATION CIRCUIT
V
= V
(1+R
/R
)+I
R
O
REF
1
2
ADJ
1
I
is very small (typically 35µA) and constant: in the V
calculation it can be ignored.
ADJ
O
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