KSI-2012-006
1
S52xxM
Low Drop Output Voltage Regulator
Description
The S52xxM is a u-cap 150mA linear voltage regulator in the SOT-25 package. This
regulator has very low dropout voltage and very low ground current. It is designed
especially for hand-sets, battery-powered devices and can be controlled by a CMOS or TTL.
When the S52xxM is disabled, power consumption drops to nearly zero.
Features
Low dropout voltage regulator
Low quiescent current and guaranteed 150mA output
Zero off-mode current
Ordering
Information
Type NO.
Marking
Package Code
S52xxM
5
SOT - 25
: Voltage Code
Outline Dimensions unit :
mm
S
S
e
e
m
m
i
i
c
c
o
o
n
n
d
d
u
u
c
c
t
t
o
o
r
r
PIN Connections
1. Supply Input
2. Ground
3. Enable/Shutdown
4. Noise Bypass
5. Regulator Output
BLOCK DIAGRAM
KSI-2012-006
2
S52xxM
Absolute Maximum Ratings
Ta=25
C
Characteristic Symbol
Ratings
Unit
Input supply voltage
V
IN
-0.4
~+16 V
Enable Input Voltage
V
EN
-0.4
~+16 V
Power Dissipation
Pd
500
mW
Junction Temperature Range
T
j
-40
~+125
C
Storage Temperature Range
T
stg
-60
~+150 C
Lead Temperature Time
T
sol
260 (5 Sec)
C
Electrical Characteristics
( V
IN
=V
OUT
+1V; I
OUT
= 100uA; C
L
=4.7uF; V
EN
2.0V; T
J
=25)
Characteristic Symbol Test
Condition
Min.
Typ.
Max
.
Unit
Output voltage
V
OUT
-
See Table 1
line Regulation
V
OUT
/
V
OUT
V
IN
=V
OUT
+1V to 16V
-
0.3
5
mV
Load Regulation
V
OUT
/
V
OUT
I
OUT
=1
mA
~100
mA
- 8 24
mV
Quiescent Current
I
CC
V
EN
0.4V(shutdown)
- 0.01 1 uA
* I
OUT
=50
mA (V
OUT
=1.5V)
400
500
* I
OUT
=100
mA (V
OUT
=1.5V)
- 500
600
* I
OUT
=50
mA (V
OUT
=1.8V)
- 150
250
* I
OUT
=100
mA (V
OUT =
1.8V)
- 250
450
* I
OUT
=100uA -
10
50
* I
OUT
=50
mA
- 110
150
Dropout Voltage
V
DROP
* I
OUT
=100
mA
- 140
250
mV
I
OUT
=50
mA,V
EN
2.0
(active)
(Vout=1.5V/1.8V)
- 1.5 3.0
Ground Pin Current
I
GND
I
OUT
=50
mA, V
EN
2.0(active)
- 0.8 1.5
mA
Output Noise
e
no
I
OUT
=50mA, C
L
=4.7uF
470pF from BYP to GND
- 260 - nV Hz
Enable Input Logic-Low Voltage
V
IL
Regulator
Shutdown
- - 0.4 V
Enable Input Logic-High Voltage
V
IH
Regulator
enabled
1.6 - - V
I
IL
V
IL
0.4V
- 0.01 1
Enable Input Current
I
IH
V
IH
2.0V
2 5 10
uA
*Note1 : Dropout Voltage is the difference between the input voltage and the output voltage at whitch point the regulator
starts to fall out of regulation (this is the point when the output voltage decreases by 100mV).
KSI-2012-006
3
S52xxM
Table 1
Electrical Characteristics Table
Test Condition; V
IN
= V
OUT(TYP)
+1V, I
OUT
=100uA, T
A
=25, unless otherwise specified.
Voltage Limit [V]
Output
Voltage[V]
Voltage
Code
MIN MAX
1.5 15
1.440
1.560
1.8 18
1.728
1.872
2.5 25
2.400
2.600
2.8 28
2.688
2.912
3.0 30
2.880
3.120
3.3 33
3.168
3.432
5.0 50
4.800
5.200
Typical Applications
Low-Noise Operation
:C
N
=470pF, C
L
4.7uF
Basic Operation
:C
N
= not used, C
L
1uF
5
KSI-2012-006
5
S52xxM
Electrical Characteristic Curves (Cont.)
Shutdown (Dis/Enable) Operation
The S52xxM output can be turned off by applying 0.4V or less to the device's Dis/Enable
pin (pin3). In shutdown mode, the S52xxM draws less than 1uA quiescent current. The
output of the S52xxM is enabled by applying 1.5V to 13V at the Dis/Enable pin. In
applications were the S52xxM output will always remain enabled, the Dis/Enable pin may
be connected to Vin(pin1). The S52xxM's shutdown circuitry includes hysteresis, as such
the device will operate properly even if a slow moving signal is applied to the Dis/Enable
pin. The device's shutdown pin includes a 2M internal pull down resistor connected to
ground.
Short Circuit Protection
The S52xxM output can withstand momentary short circuit to ground. Moreover, the
regulator can deliver very high output peak current due to its 1A instantaneous short circuit
current capability.
Noise Bypass Capacitor
In low noise applications, the self noise of the S52xxM can be decreased further by
connecting a capacitor from the noise bypass pin (pin4) to ground (pin2). The noise bypass
pin is a high impedance node as such care should be taken in printed circuit board layout to
avoid noise pick-up from external sources. Moreover, the noise bypass capacitor should
have low leakage. Noise bypass capacitors with a value as low as 470pF may be used.
However, for optimum performance, use a 0.01uF or larger, ceramic chip capacitor. Note
that the turn on and turn off response of the S52xxM is inversely proportional to the value
of the noise bypass capacitor. For fast turn on and turn off, use a small value noise Bypass
capacitor. In applications were exceptionally low output noise is not required, consider
omitting the noise Bypass capacitor altogether.
Fig. 7.
Fig. 8
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