ST111

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www.sii-ic.com HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR © Seiko Instruments Inc., 2003-2015 Rev.3.1_00 Seiko Instruments Inc. 1 The S-T111 Series is a positive voltage regulator with a low dropout voltage, high- accuracy output voltage, and low current consumption developed based on CMOS technology. A built-in low on-resistance transistor provides a lo w dropout voltage and large output current, and a built-in overcurrent protection circuit prevents the load current from exceeding the current capacity of the output transistor. An ON/OFF circuit ensures a long battery life. Compared with the voltage regulators using the conventional CMOS technology, a larger variety of capacitors are available, including small ceramic capacitors. A small SOT-23-5 package realizes high-density mounting.  Features

• Output voltage: 1.5 V to 5.5 V, selectable in 0.1 V step
• Output voltage accuracy: ±1.0%
• Dropout voltage: 190 mV typ. (3.0 V output product, IOUT = 100 mA)
• Current consumption: During operation: 50 μA typ., 90 μA max. During power-off: 0.1 μA typ., 1.0 μA max.
• Output current: Possible to output 150 mA (V IN ≥ VOUT(S) + 1.0 V)*1
• Input and output capacitors: A ceramic capacitor of 0.1 μF or more can be used.
• Ripple rejection: 80 dB typ. (f = 1.0 kHz)
• Built-in overcurrent protection circuit: Limits overcurrent of output transistor.
• Built-in ON/OFF circuit: Ensures long battery life.
• Operation temperature range: Ta = −40°C to +85°C
• Lead-free, Sn 100%, halogen-free*2 *1. Attention should be paid to the power dissipation of the package when the output current is large. *2. Refer to “ Product Name Structure” for details.  Applications
• Constant-voltage power supply for battery-powered device
• Constant-voltage power supply for personal communication device
• Constant-voltage power supply for home electric/electronic appliance
• Constant-voltage power supply for cellular phone  Package
• SOT-23-5

HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR S-T111 Series Rev.3.1_00 Seiko Instruments Inc. 2  Block Diagram VIN VSS VOUT Overcurrent protection circuit Reference voltage circuit ON/OFF *1. Parasitic diode ON/OFF circuit Figure 1

HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR Rev.3.1_00 S-T111 Series Seiko Instruments Inc. 3  Product Name Structure

• Users can select the product type, output voltage for the S-T111 Series. Refer to “ 1. Product name ” regarding the contents of product name, “2. Package ” regarding the package drawings, “3. Product name list” regarding details of the product name. 1. Product name S-T111 x xx MC - xxx TF x Output voltage 15 to 55 (e.g. when the output voltage is 1.5 V, it is ex pressed as 15.) IC direction in tape specifications*1 Package name (abbreviation) MC: SOT-23-5 Environmental code U: Lead-free (Sn 100%), halogen-free G: Lead-free (for details, please contact our sales office) Product name (abbreviation)*2 Product type*3 A: ON/OFF pin negative logic B: ON/OFF pin positive logic *1. Refer to the tape drawing. *2. Refer to the product name list. *3. Refer to “3. ON/OFF pin” in “ Operation”. 2. Package Package Name Drawing Code Package Tape Reel SOT-23-5 MP005-A-P-SD MP005-A-C-SD MP005-A-R-SD

HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR S-T111 Series Rev.3.1_00 Seiko Instruments Inc. 4 3. Product name list Table 1 Output Voltage Product Name 1.5V±1.0% S-T111B15MC-OGATFx 1.6V±1.0% S-T111B16MC-OGBTFx 1.7V±1.0% S-T111B17MC-OGCTFx 1.8V±1.0% S-T111B18MC-OGDTFx 1.9V±1.0% S-T111B19MC-OGETFx 2.0V±1.0% S-T111B20MC-OGFTFx 2.1V±1.0% S-T111B21MC-OGGTFx 2.2V±1.0% S-T111B22MC-OGHTFx 2.3V±1.0% S-T111B23MC-OGITFx 2.4V±1.0% S-T111B24MC-OGJTFx 2.5V±1.0% S-T111B25MC-OGKTFx 2.6V±1.0% S-T111B26MC-OGLTFx 2.7V±1.0% S-T111B27MC-OGMTFx 2.8V±1.0% S-T111B28MC-OGNTFx 2.9V±1.0% S-T111B29MC-OGOTFx 3.0V±1.0% S-T111B30MC-OGPTFx 3.1V±1.0% S-T111B31MC-OGQTFx 3.2V±1.0% S-T111B32MC-OGRTFx 3.3V±1.0% S-T111B33MC-OGSTFx 3.4V±1.0% S-T111B34MC-OGTTFx 3.5V±1.0% S-T111B35MC-OGUTFx 3.6V±1.0% S-T111B36MC-OGVTFx 3.7V±1.0% S-T111B37MC-OGWTFx 3.8V±1.0% S-T111B38MC-OGXTFx 3.9V±1.0% S-T111B39MC-OGYTFx 4.0V±1.0% S-T111B40MC-OGZTFx 4.1V±1.0% S-T111B41MC-OHATFx 4.2V±1.0% S-T111B42MC-OHBTFx 4.3V±1.0% S-T111B43MC-OHCTFx 4.4V±1.0% S-T111B44MC-OHDTFx 4.5V±1.0% S-T111B45MC-OHETFx 4.6V±1.0% S-T111B46MC-OHFTFx 4.7V±1.0% S-T111B47MC-OHGTFx 4.8V±1.0% S-T111B48MC-OHHTFx 4.9V±1.0% S-T111B49MC-OHITFx 5.0V±1.0% S-T111B50MC-OHJTFx 5.1V±1.0% S-T111B51MC-OHKTFx 5.2V±1.0% S-T111B52MC-OHLTFx 5.3V±1.0% S-T111B53MC-OHMTFx 5.4V±1.0% S-T111B54MC-OHNTFx 5.5V±1.0% S-T111B55MC-OHOTFx Remark 1. Please contact our sales offi ce for products with type A. 2. x: G or U 3. Please select products of environmental code = U for Sn 100%, halogen-free products.

HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR Rev.3.1_00 S-T111 Series Seiko Instruments Inc. 5  Pin Configuration 5 4 1 3 2 SOT-23-5 Top view Table 2 Pin No. Symbol Description

1 ON/OFF ON/OFF pin

2 VSS GND pin

3 NC*1 No connection

4 VOUT Output voltage pin

5 VIN Input voltage pin

*1. The NC pin is electrically open. The NC pin can be connected to VIN pin or VSS pin. Figure 2  Absolute Maximum Ratings Table 3 (Ta = 25°C unless otherwise specified) Item Symbol Absolute Maximum Rating Unit Input voltage VIN VSS − 0.3 to VSS + 7 V VON/OFF VSS − 0.3 to VIN + 0.3 V Output voltage VOUT VSS − 0.3 to VIN + 0.3 V Power dissipation PD 300 (When not mounted on board) mW 600*1 mW Operation ambient temperature T opr −40 to +85 °C Storage temperature Tstg −40 to +125 °C *1. When mounted on board [Mounted board] (1) Board size : 114.3 mm × 76.2 mm × t1.6 mm (2) Board name : JEDEC STANDARD51-7 Caution The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be exceeded under any conditions. 0 50 100 150 600 400 Power Dissipation (PD) [mW] Ambient Temperature (Ta) [°C] 200 100 300 500 700 Figure 3 Power Dissipation of Package (When Mounted on Board)

HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR S-T111 Series Rev.3.1_00 Seiko Instruments Inc. 6  Electrical Characteristics Table 4 (Ta = 25°C unless otherwise specified) Item Symbol Condition Min. Typ. Max. Unit Test Circuit Output voltage*1 VOUT(E) V IN = VOUT(S) + 1.0 V, IOUT = 30 mA VOUT(S) × 0.99 VOUT(S) VOUT(S) × 1.01 V 1 Output current*2 IOUT V IN ≥ VOUT(S) + 1.0 V 150*5 ⎯ ⎯ mA 3 Dropout voltage*3 Vdrop IOUT = 50 mA 1.5 V ≤ VOUT(S) ≤ 2.7 V Not specified V 1 2.8 V ≤ VOUT(S) ≤ 5.5 V ⎯ 0.08 0.14 V 1 IOUT = 100 mA 1.5 V ≤ VOUT(S) ≤ 1.6 V ⎯ 0.32 0.55 V 1 1.7 V ≤ VOUT(S) ≤ 1.8 V ⎯ 0.28 0.47 V 1 1.9 V ≤ VOUT(S) ≤ 2.3 V ⎯ 0.25 0.35 V 1 2.4 V ≤ VOUT(S) ≤ 2.7 V ⎯ 0.20 0.29 V 1 2.8 V ≤ VOUT(S) ≤ 5.5 V ⎯ 0.19 0.26 V 1 Line regulation OUT IN OUT1 V V V

• Δ Δ VOUT(S) + 0.5 V ≤ VIN ≤ 6.5 V, IOUT = 30 mA ⎯ 0.05 0.2 %/V 1 Load regulation ΔVOUT2 VIN = VOUT(S) + 1.0 V, 1.0 mA ≤ IOUT ≤ 80 mA ⎯ 12 40 mV 1 Output voltage temperature coefficient*4 OUT OUT V Ta V
• Δ Δ VIN = VOUT(S) + 1.0 V, IOUT = 10 mA, Current consumption during operation ISS1 VIN = VOUT(S) + 1.0 V, ON/OFF pin = ON, no load ⎯ 50 90 μA 2 Current consumption during power-off I SS2 VIN = VOUT(S) + 1.0 V, ON/OFF pin = OFF, no load ⎯ 0.1 1.0 μA 2 Input voltage VIN ⎯ 2.0 ⎯ 6.5 V ⎯ ON/OFF pin input voltage “H” V SH V IN = VOUT(S) + 1.0 V, RL = 1.0 kΩ 1.5 ⎯ ⎯ V 4 ON/OFF pin input voltage “L” V SL V IN = VOUT(S) + 1.0 V, RL = 1.0 kΩ ⎯ ⎯ 0.3 V 4 ON/OFF pin input current “H” I SH V IN = 6.5 V, VON/OFF = 6.5 V −0.1 ⎯ 0.1 μA 4 ON/OFF pin input current “L” I SL V IN = 6.5 V, VON/OFF = 0 V −0.1 ⎯ 0.1 μA 4 Ripple rejection RR VIN = VOUT(S) + 1.0 V, f = 1.0 kHz, ΔVrip = 0.5 Vrms, IOUT = 30 mA ⎯ 80 ⎯ dB 5 Short-circuit current I short VIN = VOUT(S) + 1.0 V, ON/OFF pin = ON, VOUT = 0 V ⎯ 200 ⎯ mA 3 *1. VOUT(S): Set output voltage VOUT(E): Actual output voltage Output voltage when fixing I OUT (= 30 mA) and inputting VOUT(S) + 1.0 V *2. The output current at which the output voltage becomes 95% of VOUT(E) after gradually increasing the output current. *3. Vdrop = VIN1 − (VOUT3 × 0.98) V OUT3 is the output voltage when VIN = VOUT(S) + 1.0 V and IOUT = 50 mA or IOUT = 100 mA. VIN1 is the input voltage at which the output voltage becomes 98% of VOUT3 after gradually decreasing the input voltage. *4. A change in the temperature of the output voltage [mV/°C] is calculated using the following equation. ΔVOUT ΔTa []mV/°C *1 = VOUT(S) []V *2 × ΔVOUT ΔTa • VOUT []ppm/°C *3 ÷ 1000 *1. Change in temperature of output voltage *2. Set output voltage *3. Output voltage temperature coefficient *5. The output current can be at least this value. Due to restrictions on the package power dissipation, this value may not be sati sfied. Attention should be paid to the power dissipation of the package when the output current is large. This specification is guaranteed by design.

HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR S-T111 Series Rev.3.1_00 Seiko Instruments Inc. 8  Standard Circuit ON/OFF VSS VOUTVIN CIN *1 CL Input Output GNDSingle GND *1. CIN is a capacitor for stabilizing the input. *2. A ceramic capacitor of 0.1 μF or more can be used for CL. Figure 9 Caution The above connection diagram and constant will not guarantee successful operation. Perform thorough evaluation using the actual application to set the constant.  Condition of Application Input capacitor (CIN): 0.1 μF or more Output capacitor (CL): 0.1 μF or more ESR of output capacitor: 10 Ω or less Caution Generally a series regulator may cause o scillation, depending on the selection of external parts. Check that no oscillation occurs with the application using the above capacitor.  Selection of Input and Output Capacitors (CIN, CL) The S-T111 Series requires an output capacitor between the VOUT pin and the VSS pin for phase compensation. Operation is stabilized by a cera mic capacitor with an output capacitance of 0.1 μF or more in the entire temperature range. When using an OS capacitor , a tantalum capacitor, or an aluminum electrolytic capacitor, the capacitance must be 0.1 μF or more, and the ESR must be 10 Ω or less. The value of the output overshoot or undershoot transient response varies depending on the value of the output capacitor. The required capacitance of the i nput capacitor differs depending on the application. The recommended value for an application is C IN ≥ 1.0 μF and C L ≥ 0.47 μF; however, when selecting the output capacitor, perform sufficient evaluation, including evaluation of temperature characteristics, on the actual device.

HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR Rev.3.1_00 S-T111 Series Seiko Instruments Inc. 9  Explanation of Terms 1. Low dropout voltage regulator This voltage regulator has the low dropout voltage due to its built-in low on-resistance transistor. 2. Low ESR A capacitor whose ESR (Equivalent Series Resistance) is low. The S-T111 Series enables use of a low ESR capacitor, such as a ceramic capac itor, for the output-side capacitor (C L). A capacitor whose ESR is 10 Ω or less can be used. 3. Output voltage (VOUT) The accuracy of the out put voltage is ensured at ± 1.0% under the specified c onditions of fixed input voltage*1, fixed output current, and fixed temperature. *1. Differs depending on the product. Caution If the above conditions change, the output voltage value may vary and exceed the accuracy range of the output voltage. Refer to “  Electrical Characteristics” and “  Characteristics (Typical Data)” for details. 4. Line Regulation  ΔVOUT1 ΔVIN • VOUT Indicates the dependency of the output voltage on the input voltage. That is, the values show how much the output voltage changes due to a change in the input voltage with the output current remaining unchanged. 5. Load regulation (ΔVOUT2) Indicates the dependency of the output voltage on the output current. That is, the values show how much the output voltage changes due to a change in the output current with the input voltage remaining unchanged. 6. Dropout voltage (Vdrop) Indicates the difference between input voltage (V IN1) and the output voltage when; decreasing input voltage (VIN) gradually until the output voltage has dropped out to the value of 98% of output voltage (VOUT3), which is at VIN = (VOUT3 × 0.98). Vdrop = VIN1 − (VOUT3 × 0.98)

HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR S-T111 Series Rev.3.1_00 Seiko Instruments Inc. 10 7. Output Voltage Temperature Coefficient  ΔVOUT ΔTa • VOUT The shaded area in Figure 10 is the range where V OUT varies in the operation temperature range when the output voltage temperature coefficient is ±100 ppm/°C. VOUT(E) Example of S-T111B28 typ. product −40 +25 +0.28 mV/°C VOUT [V] *1. V OUT(E) is the value of the output voltage measured at Ta = +25°C. +85 Ta [°C] −0.28 mV/°C Figure 10 A change in the temperature of the output voltage [mV/°C] is calculated using the following equation. ΔVOUT ΔTa []mV/°C *1 = VOUT(S) []V *2 × ΔVOUT ΔTa • VOUT []ppm/°C *3 ÷ 1000 *1. Change in temperature of output voltage *2. Set output voltage *3. Output voltage temperature coefficient

HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR S-T111 Series Rev.3.1_00 Seiko Instruments Inc. 12 3. ON/OFF pin This pin starts and stops the regulator. When the ON/OFF pin is set to OFF level, the entire in ternal circuit stops operating, and the built-in P-channel MOS FET output transistor between the VI N pin and the VOUT pin is turned off, reducing current consumption significantly . The VOUT pin becomes the V SS level due to the internally divided resistance of several MΩ between the VOUT pin and the VSS pin. The structure of the ON/OFF pin is as shown in Figure 12 . Since the ON/OFF pin is neither pulled down nor pulled up internally, do not use it in the floating st atus. In addition, note that the current consumption increases if a voltage of 0.3 V to V IN – 0.3 V is applied to the ON/OFF pin. When not using the ON/OFF pin, connect it to the VSS pin in the product A type, and connect it to the VIN pin in B type. Table 5 Product Type ON/OFF Pin Internal Circuit VOUT Pin Voltage Current Consumption A “L”: ON Operate Set value ISS1 A “H”: OFF Stop V SS level ISS2 B “L”: OFF Stop V SS level ISS2 B “H”: ON Operate Set value ISS1 VSS ON/OFF VIN Figure 12

HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR Rev.3.1_00 S-T111 Series Seiko Instruments Inc. 13  Precautions

• Wiring patterns for the VIN pin, the VOUT pi n and GND should be designed so that the impedance is low. When mounting an output capacitor between the VOUT pin and the VSS pin (C L) and a capacitor for stabilizing the input betw een the VIN pin and the VSS pin (C IN), the distance from the capacitors to these pins should be as short as possible.
• Note that generally the output voltage may increase w hen a series regulator is used at low load current (1.0 mA or less).
• Generally a series regulator may cause oscillati on, depending on the selection of external parts. The following conditions are recommended for S-T111 Series. However, be sure to perform sufficient evaluation under the actual usage conditions for se lection, including evaluation of temperature characteristics. Input capacitor (C IN): 1.0 μF or more Output capacitor (C L): 0.47 μF or more Equivalent series resistance (ESR): 10 Ω or less
• The voltage regulator may oscillate when the im pedance of the power supply is high and the input capacitance is small or an input capacitor is not connected.
• Overshoot may occur in the output voltage momentarily if the voltage is rapidly raised at power-on or when the power supply fluctuates. Sufficiently evaluat e the output voltage at power-on with the actual device.
• The application conditions for the input voltage, the output voltage, and the load current should not exceed the package power dissipation.
• Do not apply an electrostatic discharge to this IC that exceeds the performanc e ratings of the built-in electrostatic protection circuit.
• In determining the output current, attention should be paid to the output current value specified in Table 4 in “ Electrical Characteristics” and footnote *5 of the table.
• SII claims no responsibility for any disputes arising out of or in connection with any infringement by products including this IC of patents owned by a third party.

HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR S-T111 Series Rev.3.1_00 Seiko Instruments Inc. 14  Characteristics (Typical Data) (1) Output Voltage vs. Output current (when load current increases) S-T111B15 (Ta = 25°C) S-T111B30 (Ta = 25°C) VOUT [V] 0 100 200 300 400 500 600 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 VIN = 1.8 V 2.5 V 6.5 V VOUT [V] 200 300 400 5001000 600 VIN = 3.3 V 4.0 V 6.5 V 3.5 3.0 2.5 2.0 1.5 1.0 0.5 IOUT [mA] IOUT [mA] S-T111B50 (Ta = 25°C) VOUT [V] 200 300 4001000 VIN = 5.3 V 6.0 V 6.5 V 500 600 Remark In determining the output current, attention should be paid to the following. 1) The minimum output current value and footnote *5 in the “ Electrical Characteristics” 2) The package power dissipation IOUT [mA] (2) Output voltage vs. Input voltage S-T111B15 (Ta = 25°C) S-T111B30 (Ta = 25°C) VOUT [V] 1.6 1.5 1.4 1.3 1.2 1.1 1.0 IOUT = 1 mA 30 mA 50 mA VOUT [V] 3.1 3.0 2.9 2.8 2.7 2.6 2.5 IOUT = 1 mA 30 mA 50 mA VIN [V] VIN [V] S-T111B50 (Ta = 25°C) VOUT [V] IOUT = 1 mA 30 mA 50 mA 5.5 5.0 4.5 4.0 3.5 3.0 2.5 7.06.0 5.0 4.0 3.0 2.0 VIN [V]

HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR Rev.3.1_00 S-T111 Series Seiko Instruments Inc. 15 (3) Dropout voltage vs. Output current S-T111B15 S-T111B30 Vdrop [V] –40°C 25°C 85°C 0 50 100 150 200 0.45 0.40 0.35 0.30 0.25 0.20 0.15 0.10 0.05 Vdrop [V] –40°C 25°C 85°C 0 50 100 150 200 0.45 0.40 0.35 0.30 0.25 0.20 0.15 0.10 0.05 IOUT [mA] IOUT [mA] S-T111B50 Vdrop [V] 25°C 0 50 100 150 200 –40°C 85°C 0.45 0.40 0.35 0.30 0.25 0.20 0.15 0.10 0.05 IOUT [mA] (4) Dropout voltage vs. Set output voltage Vdrop [V] 0.40 0.35 0.30 0.25 0.20 0.15 0.10 0.05 7 1 2 3 4 5 6 0 100 mA 150 mA 50 mA 30 mA 10 mA VOUT(S) [V]

HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR S-T111 Series Rev.3.1_00 Seiko Instruments Inc. 16 (5) Output voltage vs. Ambient temperature S-T111B15 S-T111B30 VOUT [V] 1.60 1.55 1.50 1.45 1.40 25–25 75 100–50 0 50 VOUT [V] 0 25 –50 –25 50 75 100 3.20 3.15 3.10 3.05 3.00 2.95 2.90 2.85 2.80 Ta [°C] Ta [°C] S-T111B50 VOUT [V] 10075 50 250 –25–50 5.3 5.2 5.1 5.0 4.9 4.8 4.7 Ta [°C] (6) Current consumption vs. Input voltage S-T111B15 S-T111B30 ISS1 [μA] 120 100 8 6 4 2 0 85°C 25°C –40°C ISS1 [μA] 6 4 2 0 120 100 85°C 25°C –40°C VIN [V] VIN [V] S-T111B50 ISS1 [μA] 0 2 4 6 8 120 100 25°C –40°C 85°C VIN [V]

HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR Rev.3.1_00 S-T111 Series Seiko Instruments Inc. 17 (7) Ripple rejection S-T111B15 (Ta = 25°C) S-T111B30 (Ta = 25°C) VIN = 2.5 V, COUT = 0.47 μF VIN = 4.0 V, COUT = 0.47 μF Ripple Rejection [dB] 100 1k 10k 100k 10 IOUT = 1 mA 30 mA 50 mA 100 Ripple Rejection [dB] 100 1k 10k 100k 10 IOUT = 1 mA 30 mA 50 mA 100 Frequency [Hz] Frequency [Hz] S-T111B50 (Ta = 25°C) VIN = 6.0 V, COUT = 0.47 μF Ripple Rejection [dB] 100 1k 10k 100k 10 IOUT = 1 mA 30 mA 50 mA 100 Frequency [Hz]

HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR S-T111 Series Rev.3.1_00 Seiko Instruments Inc. 18  Reference Data (1) Input transient response characteristics S-T111B15 (Ta = 25°C) S-T111B30 (Ta = 25°C) IOUT = 30 mA, tr = tf = 5.0 μs, COUT = 0.47 μF, CIN = 0 μF I OUT = 30 mA, tr = tf = 5.0 μs, COUT = 0.47 μF, CIN = 0 μF VOUT [V] 1.62 1.60 1.58 1.56 1.54 1.52 1.50 1.48 1.46 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 VIN VOUT -40 -20 0 20 40 60 80 100 120 140 160 VIN [V] VOUT [V] -40 -20 0 20 40 60 80 100 120 140 160 VIN VOUT 3.08 3.06 3.04 3.02 3.00 2.98 2.96 VIN [V] t [μs] t [μs] S-T111B50 (Ta = 25°C) IOUT = 30 mA, tr = tf = 5.0 μs, COUT = 0.47 μF, CIN = 0 μF VOUT [V] 5.12 5.10 5.08 5.06 5.04 5.02 5.00 4.98 4.96 VIN VOUT -40 -20 0 20 40 60 80 100 120 140 160 VIN [V] t [μs] (2) Load transient response characteristics S-T111B15 (Ta = 25°C) S-T111B30 (Ta = 25°C) VOUT [V] 0 20 40 60 80 100 120 140 -40 -20 160 IOUT VOUT 1.70 1.65 1.60 1.55 1.50 1.45 1.40 150 100 –50 –100 –150 IOUT [mA] VOUT [V] 0 20 40 60 80 100 120 140 -40 -20 160 IOUT VOUT 150 100 –50 –100 –150 3.20 3.15 3.10 3.05 3.00 2.95 2.90 IOUT [mA] t [μs] t [μs] S-T111B50 (Ta = 25°C) VIN = 6.0 V, COUT = 0.47 μF, CIN = 1.0 μF, IOUT = 50 mA ↔100 mA VOUT [V] 0 20 40 60 80 100 120 140 -40 -20 160 VOUT IOUT 5.20 5.15 5.10 5.05 5.00 4.95 4.90 150 100 –50 –100 –150 IOUT [mA] t [μs]

HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR Rev.3.1_00 S-T111 Series Seiko Instruments Inc. 19 (3) ON/OFF pin transient response characteristics S-T111B15 (Ta = 25°C) S-T111B30 (Ta = 25°C) VOUT [V] VON/OFF VOUT VON/OFF [V] VOUT [V] VON/OFF VOUT VON/OFF [V] t [ms] t [ms]

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