KSI-2012-006 1
S52xxM
Low Drop Output Volta
g
e Re
g
ulator
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
Se
em
mi
ic
co
on
nd
du
uc
ct
to
or
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 VIN -0.4 ~+16 V
Enable Input Voltage VEN -0.4 ~+16 V
Power Dissipation Pd 500 mW
Junction Temperature Range Tj -40 ~+125
°C
Storage Temperature Range Tstg -60 ~+150
°C
Lead Temperature Time Tsol 260 (5 Sec) °C
Electrical Characteristics
(※ V
IN=VOUT+1V; IOUT = 100uA; CL=4.7uF; VEN≥2.0V; TJ=25℃)
Characteristic Symbol Test Condition Min. Typ.
Max
. Unit
Output voltage VOUT - See Table 1
line Regulation ÌVOUT/
VOUT VIN=VOUT+1V to 16V - 0.3 5 mV
Load Regulation ÌVOUT/
VOUT IOUT=1mA ~100mA - 8 24
mV
Quiescent Current ICC VEN≤0.4V(shutdown) - 0.01 1 uA
* IOUT=50mA (VOUT=1.5V) 400 500
* IOUT=100mA (VOUT=1.5V) - 500 600
* IOUT=50mA (VOUT =1.8V) - 150 250
* IOUT=100mA (VOUT =1.8V) - 250 450
* IOUT=100uA - 10 50
* IOUT=50mA - 110 150
Dropout Voltage VDROP
* IOUT=100mA - 140 250
mV
IOUT=50mA,VEN≥2.0(active)
(Vout=1.5V/1.8V) - 1.5 3.0
Ground Pin Current IGND
IOUT=50mA, VEN≥2.0(active) - 0.8 1.5
mA
Output Noise eno IOUT=50mA, CL=4.7uF
470pF from BYP to GND - 260 -
nV √Hz
Enable Input Logic-Low Voltage VIL Regulator Shutdown - - 0.4 V
Enable Input Logic-High Voltage VIH Regulator enabled 1.6 - - V
IIL VIL≤0.4V - 0.01 1
Enable Input Current
IIH VIH≥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
Tab l e 1
Electrical Characteristics Table
Test Condition; V
IN = VOUT(TYP) +1V, IOUT =100uA, TA=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, CL≥4.7uF
Basic Operation
:C
N= not used, CL≥1uF
5
KSI-2012-006 4
S52xxM
Electrical Characteristic Curves
Fi
g
. 2
Fig. 1.
Fig. 4
Fig. 3.
Fig.5 Fig.6.
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 2MΩ 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
KSI-2012-006 6
S52xxM
Output Capacitor Selection
AUK strongly recommends the use of low ESR(Equivalent series resistance) ceramic
capacitors for Cout and CN . The S52xxM is stable with low ESR capacitor (as low as zero Ω).
The value of the output capacitor should be 1uF or higher. Either ceramic chip or a
tantalum capacitor may be used at the output. Use of ceramic chip capacitors offer
significant advantages over tantalum capacitors. A Ceramic capacitor is typically cheaper
than a tantalum capacitor, it usually has a smaller footprint, lower height, and lighter
weight than a tantalum capacitor. Furthermore, unlike tantalum capacitors which are
polarized and can be damaged if connected incorrectly, ceramic capacitors are non-
polarized. Low value ceramic chip capacitors with X5R or X7R dielectric are available in the
100pF to 4.7uF range. Beware of using ceramic capacitors with Y5V dielectric since their
ESR increases significantly at cold temperatures. Figure 9 shows a list of recommended
ceramic capacitors for use at the output of S52xxM.
If a tantalum output capacitor is used then for stable operation AUK recommends a low
ESR tantalum capacitor with maximum rated ESR at or below 0.4Ω. Low ESR tantalum
capacitors, such as the TPS series from AVX Corporation (www.avxcorp.com) or the T495
series from Kemet (www.kemet.com) may be used.
In applications where a high output surge current can be expected, use a high value but
low ESR output capacitor for superior load transient response. The S52xxM is stable with
no load.
COUT Capacitor Size IOUT Dielectric Part Number Capacitor Vendor
1µF 0805 0 to 150mA X5R C2012X5R1A105KT TDK
′′ 0805 ′′ X7R GRM40X7R105K010 muRata
′′ 0805 ′′ X7R LMK212BJ105KG Taiyo-Yuden
′′ 1206 ′′ X7R GRM42-6X7R105K016 muRata
′′ 1206 ′′ X7R EMK316BJ105KL Taiyo-Yuden
′′ 1206 ′′ X5R TMK316BJ105KL Taiyo-Yuden
2.2µF 0805 0 to 150mA X5R GRM40X5R225K 6.3 muRata
′′ 0805 ′′ X5R C2012X5R0J225KT TDK
′′ 1206 ′′ X5R EMK316BJ225ML Taiyo-Yuden
4.7µF 1206 0 to 150mA X5R GRM42-6X5R475K010 MuRata
′′ 1206 ′′ X7R LMK316BJ475ML Taiyo-Yuden
Fig. 9
