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| Semiconductor 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. S52xxM Marking 5 : Voltage Code Package Code SOT - 25 Outline Dimensions BLOCK DIAGRAM unit : mm PIN Connections 1. Supply Input 2. Ground 3. Enable/Shutdown 4. Noise Bypass 5. Regulator Output KSI-2012-006 1 S52xxM Absolute Maximum Ratings Characteristic Input supply voltage Enable Input Voltage Power Dissipation Junction Temperature Range Storage Temperature Range Lead Temperature Time Ta=25C Symbol VIN VEN Pd Tj Tstg Tsol Ratings -0.4 ~+16 -0.4 ~+16 500 -40 ~+125 -60 ~+150 260 (5 Sec) Unit V V mW C C C Electrical Characteristics ( VIN=VOUT+1V; IOUT = 100uA; CL=4.7uF; VEN2.0V; TJ=25) Characteristic Output voltage line Regulation Load Regulation Quiescent Current Symbol VOUT VOUT/ VOUT VOUT/ VOUT ICC Test Condition VIN=VOUT+1V to 16V IOUT=1mA ~100mA VEN0.4V(shutdown) * IOUT=50mA (VOUT=1.5V) * IOUT=100mA (VOUT=1.5V) * IOUT=50mA (VOUT =1.8V) Min. Typ. Max . 5 24 1 500 600 250 450 50 150 250 3.0 1.5 0.4 1 10 Unit See Table 1 0.3 8 0.01 400 1.6 2 500 150 250 10 110 140 1.5 0.8 260 0.01 5 mV mV uA Dropout Voltage VDROP * IOUT=100mA (VOUT =1.8V) * IOUT=100uA * IOUT=50mA * IOUT=100mA IOUT=50mA,VEN2.0(active) mV Ground Pin Current Output Noise Enable Input Logic-Low Voltage Enable Input Logic-High Voltage Enable Input Current IGND eno VIL VIH IIL IIH (Vout=1.5V/1.8V) IOUT=50mA, VEN2.0(active) mA nV Hz V V uA IOUT=50mA, CL=4.7uF 470pF from BYP to GND Regulator Shutdown Regulator enabled VIL0.4V VIH2.0V *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 2 S52xxM Table 1 Electrical Characteristics Table Test Condition; VIN = VOUT(TYP) +1V, IOUT =100uA, TA=25, unless otherwise specified. Output Voltage[V] 1.5 1.8 2.5 2.8 3.0 3.3 5.0 Voltage Code 15 18 25 28 30 33 50 Voltage Limit [V] MIN 1.440 1.728 2.400 2.688 2.880 3.168 4.800 MAX 1.560 1.872 2.600 2.912 3.120 3.432 5.200 Typical Applications KSI-2012-006 5 Low-Noise Operation :CN=470pF, CL4.7uF Basic Operation :CN= not used, CL1uF 3 S52xxM Electrical Characteristic Curves Fig. 1. Fig. 2 Fig. 3. Fig. 4 Fig.5 Fig.6. KSI-2012-006 4 S52xxM Electrical Characteristic Curves (Cont.) Fig. 7. Fig. 8 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. KSI-2012-006 5 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 ). 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 nonpolarized. 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 (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. Fig. 9 COUT 1F 2.2F 4.7F Capacitor Size 0805 0805 0805 1206 1206 1206 0805 0805 1206 1206 1206 IOUT 0 to 150mA 0 to 150mA 0 to 150mA Dielectric X5R X7R X7R X7R X7R X5R X5R X5R X5R X5R X7R Part Number C2012X5R1A105KT GRM40X7R105K010 LMK212BJ105KG GRM42-6X7R105K016 EMK316BJ105KL TMK316BJ105KL GRM40X5R225K 6.3 C2012X5R0J225KT EMK316BJ225ML GRM42-6X5R475K010 LMK316BJ475ML Capacitor Vendor TDK muRata Taiyo-Yuden muRata Taiyo-Yuden Taiyo-Yuden muRata TDK Taiyo-Yuden MuRata Taiyo-Yuden KSI-2012-006 6 |
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