ST2L05 Datasheet, PDF (12/23 Pages) STMicroelectronics – VERY LOW QUIESCENT CURRENT DUAL VOLTAGE REGULATOR

ST2L05
Table 13: Electrical Characteristics Of Adjustable Output (I_O = 10mA to 1A, T_J = 0 to 125°C,
V_I = 4.5V to 7V, C_I = 4.7µF, C_O1 = C_O2 = 4.7µF, otherwise specified)
Symbol
Parameter
Test Conditions
V_O Reference Voltage
I_O = 5mA to 1A, V_I = 4.75 to 5.25V,
T = 25°C
V_O Reference Voltage
I_O = 5mA to 1A, V_I = 4.75 to 5.25V
∆V_O2 Line Regulation 2
V_I = 4.75 to 5.25V, I_O = 5mA to 1A
∆V_O2 Load Regulation 2
V_I = 4.75V, I_O = 10mA to 1A
V_D Dropout Voltage ∆V_O = -1% I_O = 1A
I_S
Current Limit
V_I = 5.5V
I_ADJ Adjustable Current (sinking)
I_∆ADJ Adjustable Current Change I_O = 10mA to 1A
I_OMIN Min. Output Current for
regulation
e_N
RMS Output Noise ⁽¹⁾⁽⁴⁾
T = 25°C
SVR
Supply Voltage
Rejection ⁽²⁾⁽⁴⁾
V_I = 5V
∆V_O2/∆I_O2 Transient Response
Change of V_O1 with step
load change⁽³⁾⁽⁴⁾
V_I = 5V, I_O = 1mA to 1A, t_r ≥ 1µs
V_I = 5V, I_O = 1A to 1mA, t_f ≥ 1µs
∆V_O2/∆V_I Transient Response
Change of V_OUT1 with
application of V_I ⁽³⁾⁽⁴⁾
0 to 5V step input, I_O= 1mA to 1A,
t_r ≥ 1µs
∆V_O2/∆I_O2 Transient Response Short
Circuit Removal
Response ⁽³⁾⁽⁴⁾
V_I = 5V, I_O = short to I_O = 10mA
T_R
Thermal Regulation ⁽⁴⁾
I_O = 1A, t_PULSE = 30ms
S
Temperature Stability ⁽⁴⁾
S
Long Term Stability ⁽⁴⁾
(1000Hrs)
T_J = 125°C
Min. Typ. Max. Unit
1.225 1.25 1.275 V
1.212 1.25 1.287 V
0.35 %
0.4
%
1.3
V
1
A
1
µA
200 nA
2
mA
0.003
%
60
dB
10⁽⁵⁾
%
10⁽⁵⁾
10⁽⁵⁾
%
20⁽⁵⁾
%
0.1
%/W
0.5
%
0.3
%
NOTE 1: Bandwidth of 10 Hz to 10KHz.
NOTE 2: 120Hz input ripple.
NOTE 3: C_I = 20µF, C₁ and C_O2 = 10µF. C_I, C_O1 and C_O2 are all X7R ceramic capacitors.
NOTE 4: Guaranteed by design, not tested in production.
NOTE 5: % undershoot or overshoot of V_O.
APPLICATION HINTS
EXTERNAL CAPACITORS
Like any low-dropout regulator, the ST2L05 requires external capacitors for stability. We suggest
soldering both capacitors as close as possible to the relative pins (1, 4 and 5).
INPUT CAPACITOR
An input capacitor, whose value is, at least, 2.2µF is required; the amount of the input capacitance can be
increased without limit if a good quality tantalum or aluminium capacitor is used.SMD X7R or Y5V ceramic
multilayer capacitors could not ensure stability in any condition because of their variable characteristics
with Frequency and Temperature; the use of this capacitor is strictly related to the use of the output
capacitors. For more details read the “OUTPUT CAPACITOR SECTION”.The input capacitor must be
located at a distance of not more than 0.5" from the input pin of the device and returned to a clean analog
ground.
OUTPUT CAPACITOR
The ST2L05 is designed specifically to work with Ceramic and Tantalum capacitors.Special care must be
taken when a Ceramic multilayer capacitor is used.Due to their characteristics they can sometimes have
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