S1155

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www.sii-ic.com HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR © Seiko Instruments Inc., 2007-2015 Rev.2.1_01 Seiko Instruments Inc. 1 The S-1155 Series, developed by using CMOS technology, is a positive voltage regulator with a super low dropout voltage, high-accuracy output voltage and low current consumption. The S-1155 Series provides the very low dr opout voltage and the large output current due to the built-in tr ansistor with low on-resistance. The S-1155 Series includes an overcurrent protec tion circuit that prevents the load current from exceeding the current capacitance of the output trans istor, a thermal shutdown circuit that prevents damage due to overheating, and an inrush current limit circuit to limit the excessive inrush current generated at power-on. The ON/OFF circuit ensures longer battery life. Compared wi th the voltage regulators using the conventional CMOS technology, a large variety of capacitors are available, including small ceramic capacitors The small package SOT-89-5 realizes high-density mounting.  Features

• Output voltage: 1.0 V to 5. 0 V, selectable in 0.05 V step
• Input voltage: 1.5 V to 5.5 V
• Output voltage accuracy: ±1.0% (1.0 V to 1.45 V output product: ±15 mV)
• Dropout voltage: 70 mV typ. (3.0 V output product, I OUT = 200 mA)
• Current consumption: During operation: 70 μA typ., 90 μA max. (3.0 V output product) During power-off: 0.1 μA typ., 1.0 μA max.
• Output current: Possible to output 500 mA (3.0 V output product, V IN ≥ VOUT(S) + 1.0 V)*1
• Input and output capacitors: A ceramic capacitor of 4.7 μF or more can be used.
• Ripple rejection: 70 dB typ. (1.0 V output product, f = 1.0 kHz)
• Built-in overcurrent protection circuit: Limits overcurrent of output transistor.
• Built-in thermal shutdown circuit: Prevents damage caused by heat.
• Built-in inrush current limit circuit: Li mits excessive inrush current at power-on.
• 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 TV, notebook PC and home electric appliance
• Constant-voltage power supply for portable equipment  Package
• SOT-89-5

HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR S-1155 Series Rev.2.1_01 Seiko Instruments Inc. 2 ■ Block Diagram Reference voltage circuit ON/OFF ON/OFF circuit VIN VSS VOUT Overcurrent protection circuit Thermal shutdown circuit *1. Parasitic diode Figure 1

HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR Rev.2.1_01 S-1155 Series Seiko Instruments Inc. 3  Product Name Structure Users can select the product type, output voltage, and package type for the S-1155 Series. Refer to “ 1. Product name” regarding the contents of product name, “ 2. Package ” regarding the package drawings and “ 3. Product name list” regarding details of product name. 1. Product name S-1155 x xx - U5T1 x Environmental code U: Lead-free (Sn 100%), halogen-free G: Lead-free (for details, plea se contact our sales office) Package abbreviation and packing specifications U5T1: SOT-89-5, Tape Output voltage *2 10 to 50 (e.g., when the output voltage is 1.0 V, it is expressed as 10.) Product type *3 A: ON/OFF pin negative logic B: ON/OFF pin positive logic *1. Refer to the tape drawing. *2. If you request the product which has 0.05 step, contact our sales office. *3. Refer to “ 3. ON/OFF pin” in “ Operation”. 2. Package Package Name Drawing Code Package Tape Reel SOT-89-5 UP005-A-P-SD UP00 5-A-C-SD UP005-A-R-SD

HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR S-1155 Series Rev.2.1_01 Seiko Instruments Inc. 4 3. Product name list Table 1 Output Voltage SOT-89-5

1.0 V ±15 mV S-1155B10-U5T1x

1.1 V ±15 mV S-1155B11-U5T1x

1.2 V ±15 mV S-1155B12-U5T1x

1.3 V ±15 mV S-1155B13-U5T1x

1.4 V ±15 mV S-1155B14-U5T1x

1.5 V ±1.0% S-1155B15-U5T1x 1.6 V ±1.0% S-1155B16-U5T1x 1.7 V ±1.0% S-1155B17-U5T1x 1.8 V ±1.0% S-1155B18-U5T1x 1.85 V ±1.0% S-1155B1J-U5T1x 1.9 V ±1.0% S-1155B19-U5T1x 2.0 V ±1.0% S-1155B20-U5T1x 2.1 V ±1.0% S-1155B21-U5T1x 2.2 V ±1.0% S-1155B22-U5T1x 2.3 V ±1.0% S-1155B23-U5T1x 2.4 V ±1.0% S-1155B24-U5T1x 2.5 V ±1.0% S-1155B25-U5T1x 2.6 V ±1.0% S-1155B26-U5T1x 2.7 V ±1.0% S-1155B27-U5T1x 2.8 V ±1.0% S-1155B28-U5T1x 2.85 V ±1.0% S-1155B2J-U5T1x 2.9 V ±1.0% S-1155B29-U5T1x 3.0 V ±1.0% S-1155B30-U5T1x 3.1 V ±1.0% S-1155B31-U5T1x 3.2 V ±1.0% S-1155B32-U5T1x 3.3 V ±1.0% S-1155B33-U5T1x 3.4 V ±1.0% S-1155B34-U5T1x 3.5 V ±1.0% S-1155B35-U5T1x 3.6 V ±1.0% S-1155B36-U5T1x 3.7 V ±1.0% S-1155B37-U5T1x 3.8 V ±1.0% S-1155B38-U5T1x 3.9 V ±1.0% S-1155B39-U5T1x 4.0 V ±1.0% S-1155B40-U5T1x 4.1 V ±1.0% S-1155B41-U5T1x 4.2 V ±1.0% S-1155B42-U5T1x 4.3 V ±1.0% S-1155B43-U5T1x 4.4 V ±1.0% S-1155B44-U5T1x 4.5 V ±1.0% S-1155B45-U5T1x 4.6 V ±1.0% S-1155B46-U5T1x 4.7 V ±1.0% S-1155B47-U5T1x 4.8 V ±1.0% S-1155B48-U5T1x 4.9 V ±1.0% S-1155B49-U5T1x 5.0 V ±1.0% S-1155B50-U5T1x Remark 1. Please contact our sales office for products with an output voltage other than those specified above or type A products. 2. x: G or U 3. Please select products of environmental code = U for Sn 100%, halogen-free products.

HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR Rev.2.1_01 S-1155 Series Seiko Instruments Inc. 5  Pin Configuration 5 4 1 3 2 SOT-89-5 Top view Table 2 Pin No. Symbol Description

1 ON/OFF ON/OFF pin

2 VSS GND pin

3 NC*1 No connection

4 VIN Input voltage pin

5 VOUT Output voltage pin

*1. The NC pin is electrically open. The NC pin can be connected to VIN pin or VSS pin. Figure 2

HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR S-1155 Series Rev.2.1_01 Seiko Instruments Inc. 6  Absolute Maximum Ratings Table 3 (Ta = 25°C unless otherwise specified ) Item Symbol Abso lute Maximum Rating Unit Input voltage VIN V SS − 0.3 to VSS + 6 V VON/OFF V SS − 0.3 to VIN + 0.3 V Output voltage V OUT V SS − 0.3 to VIN + 0.3 V Power dissipation P D 1000*1 mW Operation ambient temperature T opr −40 to +85 °C Storage temperature T stg −40 to +125 °C *1. When mounted on board [Mounted board] (1) Board size : 114.3 mm × 76.2 mm × t1.6 mm (2) 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 1200 800 Power dissipation (PD) [mW] Ambient temperature (Ta) [°C] 400 1000 600 200 Figure 3 Power Dissipation of Package (When Mounted on Board) Table 4 Condition Power Dissipation Thermal Resistance Value ( θj−a) SOT-89-5 (When mounted on board) 1000 mW 100°C/W

HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR Rev.2.1_01 S-1155 Series Seiko Instruments Inc. 7  Electrical Characteristics Table 5 (1 / 2) (Ta = 25°C unless otherwise specified) Item Symbol Condition Min. Typ. Max. Unit Test Circuit Output voltage *1 VOUT(E) VIN = VOUT(S) + 1.0 V, IOUT = 100 mA 1.0 V ≤ VOUT(S) < 1.5 V VOUT(S) − 0.015 VOUT(S) VOUT(S) + 0.015 V 1 1.5 V ≤ VOUT(S) ≤ 4.5 V VOUT(S) × 0.99 VOUT(S) VOUT(S) × 1.01 V 1 VIN = 5.5 V, IOUT = 100 mA 4.5 V < VOUT(S) ≤ 5.0 V VOUT(S) × 0.99 VOUT(S) VOUT(S) × 1.01 V 1 Output current *2 IOUT VIN ≥ VOUT(S) + 1.0 V 1.0 V ≤ VOUT(S) ≤ 4.5 V 500 *5 − − mA 3 VIN = 5.5 V 4.5 V < V OUT(S) ≤ 5.0 V 500 *5 − − mA 3 Dropout voltage *3 Vdrop I OUT = 200 mA 1.1 V ≤ VOUT(S) < 1.2 V − 0.44 0.48 V 1 1.2 V ≤ VOUT(S) < 1.3 V − 0.34 0.38 V 1 1.3 V ≤ VOUT(S) < 1.4 V − 0.24 0.28 V 1 1.4 V ≤ VOUT(S) < 1.5 V − 0.14 0.18 V 1 1.5 V ≤ VOUT(S) < 2.6 V − 0.10 0.15 V 1 2.6 V ≤ VOUT(S) ≤ 5.0 V − 0.07 0.10 V 1 Line regulation OUTIN 1OUT VV V Δ VOUT(S) + 0.5 V ≤ VIN ≤ 5.5 V, IOUT = 100 mA 3.6 V ≤ VOUT(S) ≤ 4.8 V − 2.5 10 mV 1 5.3 V ≤ VIN ≤ 5.5 V, IOUT = 100 mA 4.8 V < VOUT(S) ≤ 5.0 V − 2.5 10 mV 1 Load regulation ΔVOUT2 VIN = VOUT(S) + 1.0 V, 1 mA ≤ IOUT ≤ 200 mA 1.0 V ≤ VOUT(S) ≤ 4.5 V − 15 30 mV 1 VIN = 5.5 V, 1 mA ≤ IOUT ≤ 200 mA 4.5 V < VOUT(S) ≤ 5.0 V − 15 30 mV 1 Output voltage temperature coefficient*4 OUT OUT VTa V Δ VIN = VOUT(S) + 1.0 V, IOUT = 100 mA, −40°C ≤ Ta ≤ 85°C 1.0 V ≤ VOUT(S) ≤ 4.5 V − ±130 − ppm/ °C1 VIN = 5.5 V, IOUT = 100 mA, −40°C ≤ Ta ≤ 85°C 4.5 V < VOUT(S) ≤ 5.0 V − ±130 − ppm/ °C1 Current consumption during operation ISS1 VIN = VOUT(S) + 1.0 V, ON/OFF pin = ON, no load, 1.0 V ≤ VOUT(S) < 1.8 V − 90 110 μA 2 VIN = VOUT(S) + 1.0 V, ON/OFF pin = ON, no load, 1.8 V ≤ VOUT(S) ≤ 4.5 V − 70 90 μA 2 VIN = 5.5 V, ON/OFF pin = ON, no load, 4.5 V < V OUT(S) ≤ 5.0 V − 70 90 μA 2 Current consumption during power-off ISS2 VIN = VOUT(S) + 1.0 V, ON/OFF pin = OFF, no load 1.0 V ≤ VOUT(S) ≤ 4.5 V − 0.1 1.0 μA 2 VIN = 5.5 V, ON/OFF pin = OFF, no load 4.5 V < VOUT(S) ≤ 5.0 V − 0.1 1.0 μA 2 Input voltage V IN − 1.5 − 5.5 V −

HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR S-1155 Series Rev.2.1_01 Seiko Instruments Inc. 8 Table 5 (2 / 2) (Ta = 25°C unless otherwise specified) Item Symbol Condition Min. Typ. Max. Unit Test Circuit ON/OFF pin input voltage “H” V SH VIN = VOUT(S) + 1.0 V, RL = 1.0 kΩ, determined by V OUT output level VIN = 5.5 V, RL = 1.0 kΩ, determined by V OUT output level ON/OFF pin input voltage “L” VSL VIN = VOUT(S) + 1.0 V, RL = 1.0 kΩ, determined by V OUT output level VIN = 5.5 V, RL = 1.0 kΩ, determined by V OUT output level ON/OFF pin input current “H” ISH V IN = 5.5 V, VON/OFF = 5.5 V −0.1 − 0.1 μA 4 ON/OFF pin input current “L” ISL V IN = 5.5 V, VON/OFF = 0 V −0.1 − 0.1 μA 4 Ripple rejection RR VIN = VOUT(S) + 1.0 V, f = 1 kHz, ΔVrip = 0.5 Vrms, IOUT = 100 mA 1.0 V ≤ VOUT(S) < 1.2 V − 70 − dB 5 1.2 V ≤ VOUT(S) ≤ 3.0 V − 65 − dB 5 3.0 V < VOUT(S) ≤ 4.5 V − 60 − dB 5 VIN = 5.5 V, f = 1 kHz, ΔVrip = 0.5 Vrms, IOUT = 100 mA 4.5 V < VOUT(S) ≤ 5.0 V − 60 − dB 5 Short-circuit current I SHORT VIN = VOUT(S) + 1.0 V, ON/OFF pin = ON, VOUT = 0 V 1.0 V ≤ VOUT(S) ≤ 4.5 V − 200 − mA 3 VIN = 5.5 V, ON/OFF pin = ON, VOUT = 0 V 4.5 V < VOUT(S) ≤ 5.0 V − 200 − mA 3 Thermal shutdown detection temperature TSD Junction temperature − 150 − °C − Thermal shutdown release temperature TSR Junction temperature − 120 − °C − *1. V OUT(S) : Set output voltage VOUT(E) : Actual output voltage Output voltage when fixing I OUT (= 100 mA) and inputting V OUT(S) + 1.0 V or 5.5 V *2. The output current at which the output voltage becomes 95% of V OUT(E) after gradually increasing the output current. *3. V drop = VIN1 − (VOUT3 × 0.98) V OUT3 is the output voltage when V IN = VOUT(S) + 1.0 V or 5.5 V, and IOUT = 200 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 satisfied. 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 HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR S-1155 Series Rev.2.1_01 Seiko Instruments Inc. 10  Standard Circuit CIN *1 CL Input Output GNDSingle GND VOUTVIN VSS ON/OFF *1. C IN is a capacitor for stabilizing the input. *2. A ceramic capacitor of 4.7 μF or more can be used as C L. 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) : 4.7 μF or more Output capacitor (CL) : 4.7 μF or more Caution 1. Set input capacitor (C IN) and output capacitor (C L) as CIN = CL. 2. Generally a series regulator may cause oscillation, depending on the selection of external parts. Confirm that no oscillation occurs in the app lication for which the abov e capacitors are used.  Selection of Input and Output Capacitors (CIN, CL) The S-1155 Series requires an output capacitor between the VOUT pin and the VSS pin for phase compensation. Operation is stabilized by a ceramic capacitor with an output capacitance of 4.7 μF or more over the entire temperature range. When using an OS capacitor, a tantalum capacitor, or an aluminum electrolytic capacitor, the capacitance must be 4.7 μF or more. The values of output overshoot and undershoot, which are transient response characteristics, vary depending on the value of output capacitor. The required value of capacitance for the input capacitor differs depending on the application. Set the value for input capacitor (C IN) and output capacitor (C L) as follows. CIN ≥ 4.7 μF CL ≥ 4.7 μF CIN = CL Caution The S-1155 Series may o scillate if setting the value as C IN ≥ 4.7 μF, CL ≥ 4.7 μF, CIN < CL. Define the values by sufficient evaluation including the temperature characteristics under the usage condition.

HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR Rev.2.1_01 S-1155 Series Seiko Instruments Inc. 11  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. Output voltage (V OUT) The accuracy of the output voltage is ensured at ±1.0% or ±15 mV*2 under the specified conditions of fixed input voltage*1, fixed output current, and fixed temperature. *1. Differs depending on the product. *2. W h e n VOUT < 1.5 V : ±15 mV, when 1.5 V ≤ VOUT : ±1.0% 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. 3. Line regulation  ΔVOUT1 ΔVIN•VOUT Indicates the dependency of the output voltage against the input voltage. That is, the value shows how much the output voltage changes due to a change in the input voltage after fixing output current constant. 4. Load regulation ( ΔVOUT2) Indicates the dependency of the output voltage against the output current. That is, the value shows how much the output voltage changes due to a change in the output current after fixing output current constant. 5. Dropout voltage (V drop) Indicates the difference between input voltage (V IN1) and the output voltage when; decreasing input voltage (V IN) gradually until the output voltage has dropped out to the value of 98% of output voltage (V OUT3), which is at VIN = VOUT(S) + 1.0 V or 5.5 V. V drop = VIN1 − (VOUT3 × 0.98)

HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR S-1155 Series Rev.2.1_01 Seiko Instruments Inc. 12 6. 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 ±130 ppm/°C. Example of S-1155B30 typ. product −40 +25 +0.39 mV/ °C VOUT [V] +85 Ta [ °C] VOUT(E) −0.39 mV/ °C *1. VOUT(E) is the value of the output voltage measured at Ta = +25°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 HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR Rev.2.1_01 S-1155 Series Seiko Instruments Inc. 15 5. Thermal shutdown circuit The S-1155 Series has a thermal shutdown circuit to pr otect the device from damage due to overheat. When the junction temperature rises to 150 °C typ., the thermal shutdown circuit operates to stop regulating. When the junction temperature drops to 120 °C typ., the thermal shutdown circuit is released to restart regulating. Due to self-heating of the S-1155 Series, if the thermal shutdown circuit starts operating, it stops regulating so that the output voltage drops. When regulation stops, the S-1155 Series does not itself generate heat so that the IC’s temperature drops. When the temperature drops, the thermal shutdown circuit is released to restart regulating, thus the S-1155 Series generates heat again. Repeating this procedure makes waveform of the output voltage pulse-like form. Stop or restart of regulation continues unless decreasing either or both of the input voltage and the output current in order to reduce the internal power consumption, or decreasing the ambient temperature. Table 7 Thermal Shutdown Circuit VOUT Pin Voltage Operation: 150°C typ.*1 VSS level Release: 120°C typ.*1 Set value *1. Junction temperature 6. Inrush current limit circuit The S-1155 Series has a built-in inrush current limit circuit to limit the inrush current generated at power-on or at the time when the ON/OFF pin is set to ON. This circuit limits the inrush current (400 mA, typ.) immediately after power-on or from the time when the ON/OFF pin is set to ON until the specified time (100 μs min.) which is set internally. Caution The junction temperature drops to 120 °C typ. by the operation of thermal shutdown circuit, after stopping regulation, the circuit is released to restart regulation; in this case, note that the period to limit inrush current may become shorter (10 μs min.).

HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR S-1155 Series Rev.2.1_01 Seiko Instruments Inc. 16  Precautions

• Wiring patterns for the VIN pin, the VOUT pin and GND should be designed so that the impedance is low. When mounting an output capacitor betwe en the VOUT pin and the VSS pin (C L) and a capacitor for stabilizing the input between 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 when a series regulator is used at low load current (1.0 mA or less).
• Note that generally the output voltage may increase due to the leakage current from an output driver when a series regulator is used at high temperature.
• Note that the output voltage may increase due to the leakage current from an output driver even if the ON/OFF pin is at OFF level when a series regulator is used at high temperature.
• Generally a series regulator may cause oscillation, depending on the selection of external parts. The following conditions are recommended for the S-1155 Series. However, be sure to perform sufficient evaluation under the actual usage conditions for selection, including evaluation of temperature characteristics. Refer to “ 5. Example of Equivalent Series Resistance vs. Output Current Characteristics (Ta = 25°C) ” in “ Reference Data ” for the equivalent series resistance (R ESR) of the output capacitor. Input capacitor (CIN): 4.7 μF or more Output capacitor (CL): 4.7 μF or more
• The voltage regulator may oscillate when the impedance of the power supply is high and the input capacitance is small or an input capacitor is not connected. Note that the voltage regulator may oscillate when the value of the output capacitor is greater than that of the input capacitor.
• Ringing may occur when these three conditions below are satisfied. Before selecting an input capacitor, be sure to evaluate sufficiently under the actual usage conditions, including the temperature characteristics. The power supply inductance is high. The load current is 100 mA or more. The difference between the input voltage and the output voltage is close to the value of dropout voltage.
• If the output capacitance is small, power supply’s fluctuati on and the characteristics of load fluctuation become worse. Sufficiently evaluate the output voltage’s fluctuation with the actual device.
• Overshoot may occur in the output voltage momentarily if the voltage is rapidly raised at power-on or when the power supply fluctuates. Sufficiently evaluate 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 performance 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 5 i n “ 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 HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR Rev.2.1_01 S-1155 Series Seiko Instruments Inc. 17  Characteristics (Typical Data) 1. Output Voltage vs. Output Current ( When load current increases ) (Ta = 25°C) S-1155B10 S-1155B30 200 400 600 VOUT [V] IOUT [mA] 0.6 0.4 0.8 1.0 800 0.2 1000 1.2 VIN = 1.5 V 3.0 V 5.5 V 2.0 V 200 400 600 VOUT [V] IOUT [mA] 1.0 2.0 1.5 2.5 3.0 800 0.5 1000 3.5 4.0 V 5.5 VVIN = 3.5 V 5.0 V S-1155B50 200 400 600 VOUT [V] IOUT [mA] 800 1000 5.5 V VIN = 5.3 V Remark In determining the output current, attention should be paid to the following. 1. The minimum output current value and footnote *5 of Table 5 in “ Electrical Characteristics” 2. Power dissipation of the package 2. Output Voltage vs. Input Voltage (Ta = 25°C) S-1155B10 S-1155B30 1.0 1.5 2.0 VOUT [V] VIN [V] 0.5 1.1 0.5 0.8 0.7 0.9 1.0 2.5 3.0 0.6 IOUT = 1 mA 50 mA 100 mA 3.0 3.5 4.0 VOUT [V] VIN [V] 2.5 3.1 2.6 2.8 2.7 2.9 3.0 4.5 5.0 2.5 IOUT = 1 mA 50 mA 100 mA S-1155B50 4.7 4.9 5.1 VOUT [V] VIN [V] 4.5 5.1 4.6 4.8 4.7 4.9 5.0 5.3 4.5 5.5 IOUT = 1 mA 100 mA 50 mA

HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR S-1155 Series Rev.2.1_01 Seiko Instruments Inc. 18 3. Dropout Voltage vs. Output Current S-1155B10 S-1155B30 /K32/K30/K30 /K34/K30/K30 /K35/K30/K30 /K56 /K64/K72/K6F/K70 /K5B/K56/K5D /K49 /K4F/K55/K54 /K5B/K6D/K41/K5D /K30 /K30/K2E/K32/K30 /K30/K2E/K33/K30 /K30/K2E/K32/K35 /K30/K2E/K33/K35 /K30/K2E/K34/K30 /K36/K30/K30 /K30/K2E/K30/K35 /K30/K2E/K31/K35 /K30/K2E/K31/K30 /K31/K30/K30 /K33/K30/K30 /K30 /K2D /K34/K30 /KB0 /K43 /K54 /K61/K3D/K38 /K35 /KB0 /K43 /K32/K35 /KB0 /K43 /K56 /K64/K72/K6F/K70 /K5B/K56/K5D /K30/K2E/K30/K35 /K30 /K30/K2E/K31/K30 /K30/K2E/K31/K35 /K30/K2E/K32/K30 /K32/K30/K30 /K34/K30/K30 /K35/K30/K30 /K49 /K4F/K55/K54 /K5B/K6D/K41/K5D /K30 /K36/K30/K30/K31/K30/K30 /K33/K30/K30 /K2D /K34/K30 /KB0 /K43 /K32/K35 /KB0 /K43 /K54 /K61/K3D/K38 /K35 /KB0 /K43 S-1155B50 /K56 /K64/K72/K6F/K70 /K5B/K56/K5D /K30/K2E/K30/K35 /K30 /K30/K2E/K31/K30 /K30/K2E/K31/K35 /K30/K2E/K32/K30 /K32/K30/K30 /K34/K30/K30 /K35/K30/K30 /K49 /K4F/K55/K54 /K5B/K6D/K41/K5D /K30 /K36/K30/K30/K31/K30/K30 /K33/K30/K30 /K2D /K34/K30 /KB0 /K43 /K32/K35 /KB0 /K43 /K54 /K61/K3D/K38 /K35 /KB0 /K43 4. Dropout Voltage vs. Set Output Voltage 123 Vdrop [V] VOUT(S) [V] 0.40 0.35 0.30 0.25 0.20 0.15 4 6 0.10 0.05 IOUT = 500 mA 300 mA 10 mA

HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR Rev.2.1_01 S-1155 Series Seiko Instruments Inc. 19 5. Output Voltage vs. Ambient Temperature S-1155B10 S-1155B30 25 02 5 VOUT [V] Ta [C] 40 1.050 1.075 1.025 1.000 0.975 0.950 0.925 0.900 50 85 1.100 25 0 25 VOUT [V] Ta [C] 40 3.10 3.15 3.05 3.00 2.95 2.90 2.85 2.80 50 85 3.20 S-1155B50 25 0 25 VOUT [V] Ta [C] 40 5.10 5.20 5.00 4.90 4.80 4.70 50 85 5.30 6. Current Consumption vs. Input Voltage S-1155B10 S-1155B30 0.5 2.5 4.5 ISS1 [A] VIN [V] 100 120 1.5 3.5 5.5 40 C Ta = 85 C 25 C /K30/K2E/K35 /K32/K2E/K35 /K34/K2E/K35 /K49 /K53/K53/K31 /K5B /K6D /K41/K5D /K56 /K49/K4E /K5B/K56/K5D /K30 /K37/K30 /K38/K30 /K36/K30 /K35/K30 /K34/K30 /K31/K2E/K35 /K33/K2E/K35 /K35/K2E/K35 /K32/K30 /K33/K30 /K31/K30 /K30 /K31/K2E/K30 /K33/K2E/K30 /K35/K2E/K30 /K32/K2E/K30 /K34/K2E/K30 /K2D /K34/K30 /KB0 /K43 /K54 /K61/K3D/K38 /K35 /KB0 /K43 /K32/K35 /KB0 /K43 S-1155B50 /K30/K2E/K35 /K32/K2E/K35 /K34/K2E/K35 /K49 /K53/K53/K31 /K5B /K6D /K41/K5D /K56 /K49/K4E /K5B/K56/K5D /K30 /K37/K30 /K38/K30 /K36/K30 /K35/K30 /K34/K30 /K31/K2E/K35 /K33/K2E/K35 /K35/K2E/K35 /K32/K30 /K33/K30 /K31/K30 /K30 /K31/K2E/K30 /K33/K2E/K30 /K35/K2E/K30 /K32/K2E/K30 /K34/K2E/K30 /K2D /K34/K30 /KB0 /K43 /K54 /K61/K3D/K38 /K35 /KB0 /K43 /K32/K35 /KB0 /K43

HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR S-1155 Series Rev.2.1_01 Seiko Instruments Inc. 20 7. Ripple Rejection (Ta = 25 °C) S-1155B10 VIN = 2.0 V, COUT = 4.7 μF S-1155B30 VIN = 4.0 V, COUT = 4.7 μF 100 1K 10K Ripple Rejection [dB] Frequency [Hz] 10 1M 100 100K IOUT = 1 mA 30 mA 100 mA 100 1K 10K Ripple Rejection [dB] Frequency [Hz] 10 1M 100 100K IOUT = 1 mA 30 mA 100 mA S-1155B50 VIN = 5.5 V, COUT = 4.7 μF 100 1K 10K Ripple Rejection [dB] Frequency [Hz] 10 1M 100 100K IOUT = 1 mA 30 mA 100 mA

HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR Rev.2.1_01 S-1155 Series Seiko Instruments Inc. 21  Reference Data 1. Characteristics of Input Transient Response (Ta = 25°C) S-1155B10 IOUT = 100 mA, tr = tf = 5.0 μs, COUT = 4.7 μF, CIN = 4.7 μF S-1155B30 IOUT = 100 mA, tr = tf = 5.0 μs, COUT = 4.7 μF, CIN = 4.7 μF 0 200 VOUT [V] t [μs] 200 600 400 800 1000 1200 0.95 VIN [V] 1.00 1.05 1.10 1.15 VIN VOUT VIN [V] 0 200 t [μs] 200 600400 800 1000 1200 VOUT [V] 3.00 3.05 3.10 3.15 3.20 2.90 2.95 VIN VOUT S-1155B50 IOUT = 100 mA, tr = tf = 5.0 μs, COUT = 4.7 μF, CIN = 4.7 μF 4.90 4.95 VIN [V] 5.00 5.05 5.10 5.15 5.20 5.25 0 200 t [μs] 200 600400 800 1000 1200 VOUT [V] VIN VOUT 2. Characteristics of Load Transient Response (Ta = 25 °C) S-1155B10 VIN = 2.0 V, COUT = 4.7 μF, CIN = 4.7 μF, IOUT = 50 mA ↔ 100 mA S-1155B30 VIN = 4.0 V, COUT = 4.7 μF, CIN = 4.7 μF, IOUT = 50 mA ↔ 100 mA 150 100 IOUT [mA] 50 100 0.90 0.95 1.00 1.05 1.10 1.15 1.20VOUT [V] 0 200 t [μs] 200 600400 800 1000 1200 150 IOUT VOUT 150 100 IOUT [mA] 50 100 2.90 2.95 3.00 3.05 3.10 3.15 3.20VOUT [V] 0 200 t [μs] 200 600400 800 1000 1200 150 IOUT VOUT S-1155B50 VIN = 5.5 V, COUT = 4.7 μF, CIN = 4.7 μF, IOUT = 50 mA ↔ 100 mA IOUT [mA] 50 100 4.90 4.95 5.00 5.05 5.10 5.15 5.20VOUT [V] 0 200 t [μs] 200 600400 800 1000 1200 150 IOUT VOUT 100 150

HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR S-1155 Series Rev.2.1_01 Seiko Instruments Inc. 22 3. Transient Response Characteristics of ON/OFF Pin (Ta = 25°C) S-1155B10 VIN = 2.0 V, COUT = 4.7 μF, CIN = 4.7 μF, IOUT = 100 mA VON / OFF = 0 V → 2.0 V, tr = 1.0 μs S-1155B30 VIN = 4.0 V, COUT = 4.7 μF, CIN = 4.7 μF, IOUT = 100 mA VON / OFF = 0 V → 4.0 V, tr = 1.0 μs VOUT [V]2 VOUT VON/OFF [V] t [μs] 0 500500 1000 1500 2000 VON/OFF VOUT [V]4 VON/OFF [V] t [μs] 0 500500 1000 1500 2000 VOUT VON/OFF S-1155B50 VIN = 5.5 V, COUT = 4.7 μF, CIN = 4.7 μF, IOUT = 100 mA VON / OFF = 0 V → 5.5 V, tr = 1.0 μs VOUT [V]8 VON/OFF [V] t [μs] 0 500500 1000 1500 2000 VOUT VON/OFF 4. Characteristics of Inrush Current (Ta = 25 °C) S-1155B10 VIN = 2.0 V, COUT = 4.7 μF, CIN = 4.7 μF, IOUT = 100 mA VIN = 2.0 V, COUT = 4.7 μF, CIN = 4.7 μF, IOUT = 500 mA 1.2 1.0 0.8 IOUT [A]0.6 t [μs] 05 050 100 150 200 0.2 0.4 VON/OFF [V] / VOUT [V]4 VOUT VON/OFF IOUT 1.2 1.0 0.8 IOUT [A]0.6 t [μs] 0 100100 200 300 400 0.2 0.4 VON/OFF [V] / VOUT [V]4 500 VOUT VON/OFF IOUT S-1155B30 VIN = 4.0 V, COUT = 4.7 μF, CIN = 4.7 μF, IOUT = 100 mA VIN = 4.0 V, COUT = 4.7 μF, CIN = 4.7 μF, IOUT = 500 mA 1.2 1.0 0.8 IOUT [A]0.6 t [μs] 05 050 100 150 200 0.2 0.4 VON/OFF [V] / VOUT [V]4 VOUT VON/OFF IOUT 1.2 1.0 0.8 IOUT [A]0.6 t [μs] 0 100100 200 300 400 0.2 0.4 VON/OFF [V] / VOUT [V]4 500 VOUT VON/OFF IOUT

HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR Rev.2.1_01 S-1155 Series Seiko Instruments Inc. 23 S-1155B50 VIN = 5.5 V, COUT = 4.7 μF, CIN = 4.7 μF, IOUT = 100 mA VIN = 5.5 V, COUT = 4.7 μF, CIN = 4.7 μF, IOUT = 500 mA 1.2 1.0 0.8 IOUT [A]0.6 t [μs] 0 100100 200 300 400 0.2 0.4 VON/OFF [V] / VOUT [V]4 500 VOUT VON/OFF IOUT 1.2 1.0 0.8 IOUT [A]0.6 t [μs] 0 100100 200 300 400 0.2 0.4 VON/OFF [V] / VOUT [V]4 500 VOUT VON/OFF IOUT 5. Example of Equivalent Series Resistance vs. Output Current Characteristics (Ta = 25°C) 100 0.1 500 IOUT [mA] RESR [Ω] CIN = CL = 4.7 μF Stable CIN VIN VSS CL RESR S-1155 Series VOUT ON/OFF *1. CL: TAIYO YUDEN Co., Ltd. LMK316BJ475ML (4.7 μF)

HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR S-1155 Series Rev.2.1_01 Seiko Instruments Inc. 24  Marking Specification 1. SOT-89-5 (1) (2) (3) (4) (5) (6) 123 Top view (1) to (3) : Product abbreviation (refer to Product Name vs. Product Code ) (4) to (6) : Lot number Product Name vs. Product Code Product Name Product Code Product Name Product Code S-1155B10-U5T1x S K A S-1155B30-U5T1x S K W S-1155B11-U5T1x S K B S-1155B31-U5T1x S K X S-1155B12-U5T1x S K C S-1155B32-U5T1x S K Y S-1155B13-U5T1x S K D S-1155B33-U5T1x S K Z S-1155B14-U5T1x S K E S-1155B34-U5T1x S L A S-1155B15-U5T1x S K F S-1155B35-U5T1x S L B S-1155B16-U5T1x S K G S-1155B36-U5T1x S L C S-1155B17-U5T1x S K H S-1155B37-U5T1x S L D S-1155B18-U5T1x S K I S-1155B38-U5T1x S L E S-1155B1J-U5T1x S K J S-1155B39-U5T1x S L F S-1155B19-U5T1x S K K S-1155B40-U5T1x S L G S-1155B20-U5T1x S K L S-1155B41-U5T1x S L H S-1155B21-U5T1x S K M S-1155B42-U5T1x S L I S-1155B22-U5T1x S K N S-1155B43-U5T1x S L J S-1155B23-U5T1x S K O S-1155B44-U5T1x S L K S-1155B24-U5T1x S K P S-1155B45-U5T1x S L L S-1155B25-U5T1x S K Q S-1155B46-U5T1x S L M S-1155B26-U5T1x S K R S-1155B47-U5T1x S L N S-1155B27-U5T1x S K S S-1155B48-U5T1x S L O S-1155B28-U5T1x S K T S-1155B49-U5T1x S L P S-1155B2J-U5T1x S K U S-1155B50-U5T1x S L Q S-1155B29-U5T1x S K V Remark 1. x: G or U 2. Please select products of environmental code = U for Sn 100%, halogen-free products.

/X4E/X6F/X2E /X54/X49/X54/X4C/X45 /X53/X43/X41/X4C/X45 /X55/X4E/X49/X54/X6D/X6D /X53/X65/X69/X6B/X6F/X20/X49/X6E/X73/X74/X72/X75/X6D/X65/X6E/X74/X73/X20/X49/X6E/X63/X2E /X31/X2E/X35/XB1/X30/X2E/X31 /X31/X2E/X35/XB1/X30/X2E/X31 /X31/X2E/X36/XB1/X30/X2E/X32 /X34/X2E/X35/XB1/X30/X2E/X31 /X31/X33 /X32 /X31/X2E/X35/XB1/X30/X2E/X31 /X30/X2E/X34/XB1/X30/X2E/X30/X35 /X30/X2E/X34/XB1/X30/X2E/X31 /X30/X2E/X34/X35/XB1/X30/X2E/X31 /X30/X2E/X34/XB1/X30/X2E/X31/X34/X35/XB0 /X30/X2E/X33 /X35/X34 /X4E/X6F/X2E/X20/X55/X50/X30/X30/X35/X2D/X41/X2D/X50/X2D/X53/X44/X2D/X31/X2E/X31 /X55/X50/X30/X30/X35/X2D/X41/X2D/X50/X2D/X53/X44/X2D/X31/X2E/X31 /X53/X4F/X54/X38/X39/X35/X2D/X41/X2D/X50/X4B/X47/X20/X44/X69/X6D/X65/X6E/X73/X69/X6F/X6E/X73

/X4E/X6F/X2E /X54/X49/X54/X4C/X45 /X53/X43/X41/X4C/X45 /X55/X4E/X49/X54/X6D/X6D /X53/X65/X69/X6B/X6F/X20/X49/X6E/X73/X74/X72/X75/X6D/X65/X6E/X74/X73/X20/X49/X6E/X63/X2E /X32/X2E/X30/XB1/X30/X2E/X31 /X30/X2E/X33/XB1/X30/X2E/X30/X35/X38/X2E/X30/XB1/X30/X2E/X31/XF8/X31/X2E/X35/X2B/X30/X2E/X31 /X20/X2D/X30 /X32/X2E/X30/XB1/X30/X2E/X30/X35 /XF8/X31/X2E/X35/X2B/X30/X2E/X31 /X20/X2D/X30 /X34/X2E/X37/X35/XB1/X30/X2E/X31 /X35/XB0/X20/X6D/X61/X78/X2E /X31/X33/X32 /X35/X34 /X4E/X6F/X2E/X20/X55/X50/X30/X30/X35/X2D/X41/X2D/X43/X2D/X53/X44/X2D/X31/X2E/X31 /X55/X50/X30/X30/X35/X2D/X41/X2D/X43/X2D/X53/X44/X2D/X31/X2E/X31 /X53/X4F/X54/X38/X39/X35/X2D/X41/X2D/X43/X61/X72/X72/X69/X65/X72/X20/X54/X61/X70/X65 /X46/X65/X65/X64/X20/X64/X69/X72/X65/X63/X74/X69/X6F/X6E /X34/X2E/X30/XB1/X30/X2E/X31/X28/X31/X30/X20/X70/X69/X74/X63/X68/X65/X73/X20/X3A/X20/X34/X30/X2E/X30/XB1/X30/X2E/X32/X29

/X4E/X6F/X2E /X54/X49/X54/X4C/X45 /X53/X43/X41/X4C/X45 /X55/X4E/X49/X54/X6D/X6D /X53/X65/X69/X6B/X6F/X20/X49/X6E/X73/X74/X72/X75/X6D/X65/X6E/X74/X73/X20/X49/X6E/X63/X2E /X31/X36/X2E/X35/X6D/X61/X78/X2E /X31/X33/X2E/X30/XB1/X30/X2E/X33 /X51/X54/X59/X2E/X31/X2C/X30/X30/X30 /X28/X36/X30/XB0/X29/X28/X36/X30/XB0/X29 /X4E/X6F/X2E/X20/X55/X50/X30/X30/X35/X2D/X41/X2D/X52/X2D/X53/X44/X2D/X31/X2E/X31 /X55/X50/X30/X30/X35/X2D/X41/X2D/X52/X2D/X53/X44/X2D/X31/X2E/X31 /X53/X4F/X54/X38/X39/X35/X2D/X41/X2D/X52/X65/X65/X6C /X45/X6E/X6C/X61/X72/X67/X65/X64/X20/X64/X72/X61/X77/X69/X6E/X67/X20/X69/X6E/X20/X74/X68/X65/X20/X63/X65/X6E/X74/X72/X61/X6C/X20/X70/X61/X72/X74

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