S52XXM中文资料
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
□□: V oltage Code
S e m i c o n d u c t o r
Absolute Maximum Ratings Ta=25°C
Unit
Ratings
Characteristic Symbol
~+16 V
Input supply voltage V IN -0.4
Enable Input Voltage V EN -0.4
~+16 V
Power Dissipation Pd 500 mW
~+125 °C
Junction Temperature Range T j -40
~+150 °C
Storage Temperature Range T stg -60
Lead Temperature Time T sol260 (5 Sec) °C
Electrical Characteristics
=
(※V=V+1V; I = 100uA; C=4.7uF; V≥2.0V; T=25℃) Array *Note1 : Dropout V oltage 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).
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
Electrical Characteristic Curves
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 .
Output Capacitor Selection
AUK strongly recommends the use of low ESR(Equivalent series resistance) ceramic capacitors for Cout and C N . The S52xxM is stable with low ESR capacitor (as low as zero ?). 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 0.4?. Low ESR tantalum capacitors, such as the TPS series from AVX Corporation (https://www.wendangku.net/doc/b22855647.html,) or the T495 series from Kemet (https://www.wendangku.net/doc/b22855647.html,) 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.
Fig. 9
C OUT Capacitor Size I OUT 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