YB1900C Ultra Low Quiescent Current Smart Load Switch Description Features The YB1900C is a high side slew rate controlled smart load switch. The slew rate control in YB1900C can effectively avoid the large in-rush current which is commonly observed in normal power switches. Moreover, the level shift in YB1900C allows customers to control 1.8 to 5.5V system with 1.5V logic and without sacrificing leakage current. The YB1900C has typical low RDS(on) around 100mΩ, which allows large power handling capabilities. Very low quiescent current and fast load discharge also makes it ideal for power sensitive applications nowadays. The YB1900C is available in SOT23-5 or SOT23-6 package with the temperature range valid from -40 to 85℃. 1.8V to 5.5V Input Voltage Range Slew Rate Limited at 100μs Very Low RDS(on), Typically 100mΩ Less than 1μA Shutdown Current Output Voltage As Low As 0.6V Very Low Quiescent Current, Typically 2μA Fast Shutdown Load Discharge TTL / CMOS Input Logic Level 4KV ESD Rating EMI Free Circuit SOT23-5 or SOT23-6 Package Green Package (RoHS) Available Applications Cellular and Smart Phones Hot Swap Supplies Microprocessors and DSP Core Supplies PDAs MP3 Players Digital Still and Video Cameras Portable Instruments Typical Application Circuit VIN VIN OUT YB1900C CIN 1µF EN OFF ON VOUT COUT 0.1µF GND Figure 1: Typical Application Circuit YB1900C Rev.1.4 www.yobon.com.tw 1 YB1900C Ultra Low Quiescent Current Smart Load Switch Pin Configuration OUT 1 GND 2 EN 3 5 VIN 4 VIN OUT 1 6 VIN GND 2 5 GND EN 3 4 VIN SOT23-5 SOT23-6 Figure 2: Pin Configuration Pin Assignment &Description Table 1 FOR SOT23-5 Pin Name Description 1 OUT Switch output drain of P-channel power MOSFET. 2 GND Ground pin. Connect directly to local ground plane. 3 EN Enable control input. 4, 5 VIN Switch input source of P-channel power MOSFET. Table 2 FOR SOT23-6 Pin Name Description 1 OUT Switch output drain of P-channel power MOSFET. 2, 5 GND Ground pin. Connect directly to local ground plane. 3 EN Enable control input. 4, 6 VIN Switch input source of P-channel power MOSFET. Ordering Information Table 3 Order Number Package Type Supplied As Package Marking YB1900ST25 SOT23-5 3000 Units Tape & Reel Y9C YB1900ST26 SOT23-6 3000 Units Tape & Reel Y9C YB1900C Rev.1.4 www.yobon.com.tw 2 YB1900C Ultra Low Quiescent Current Smart Load Switch Absolute Maximum Ratings (Note 1) Recommended Operating Conditions VIN to GND .................................. -0.3V to 6V VEN to GND ................................. -0.3V to 6V OUT to GND ............................... -0.3V to 6V Maximum Current ..................................1.5A Junction Temperature ..........................150℃ Storage Temperature ............ -65℃ to 150℃ Lead Temperature................................300℃ ESD HBM ............................................. 4KV ESD MM ..............................................200V (Note 2) Supply Voltage VIN................. 1.8V to 5.5V Operating Temperature.........-40℃ to 85℃ Output Current........................... 0V to 1.2A Thermal Resistance θJA .................................................220℃/W (Note 3) Note: 1. Exceeding these ratings may damage the device. 2. The device is not guaranteed to function outside of its operating conditions. 3. θJA is measured in the natural convection at TA = 25℃ on a low effective thermal conductivity board. Electrical Characteristics Table 4 (VIN=5V, VEN=1.5V, TA=25°C, unless otherwise noted.) Description Symbol Test Conditions MIN TYP MAX Units 1.8 5 5.5 V 2 5 μA Input Voltage VIN Quiescent Current IQ VEN = 1.5V Shutdown Current ISD VEN = 0V, OUT = open 0.1 1 μA Off Switch Current ISO VEN = 0V, VOUT = 0V 0.1 1 μA VIN = 5V @ 100mA 100 130 VIN = 4.2V @ 100mA 110 140 VIN = 3V @ 100mA 130 160 VIN = 1.8V @ 100mA 200 250 On Resistance RDS(ON) mΩ EN Input Logic Low VIL ROUT = 10Ω 0.6 V EN Input Logic High VIH ROUT = 10Ω 0.8 V EN Input Leakage IEN VEN = 5.5V 0.1 1 μA TD(ON) ROUT = 10Ω 40 80 μs TON ROUT = 10Ω 100 TD(OFF) ROUT = 10Ω 4 10 μs 150 250 Ω Output Turn-On Delay Output Turn-On Rise Time Output Turn-Off Delay Output Pull-Down Resistance YB1900C Rev.1.4 RPD VEN = 0V www.yobon.com.tw μs 3 YB1900C Ultra Low Quiescent Current Smart Load Switch Typical Performance Characteristics RDS(ON) vs. VIN Quiescent Current vs. Input Voltage RDS(ON) vs. Temperature YB1900C Rev.1.4 www.yobon.com.tw Quiescent Current Temperature 4 YB1900C Ultra Low Quiescent Current Smart Load Switch Typical Performance Characteristics Turn-On Transient Response (VIN=3V, RL=6Ω) Turn-On Transient Response (VIN=5V, RL=10Ω) Turn-Off Transient Response (VIN=3V, RL=6Ω) Turn-Off Transient Response (VIN=5V, RL=10Ω) YB1900C Rev.1.4 www.yobon.com.tw 5 YB1900C Ultra Low Quiescent Current Smart Load Switch Function Block VIN OUT Slew Rate Control EN Level Shift GND Figure 3: Function Block Application Information The YB1900C features very low quiescent current and very low RDS(ON) and making them ideal for battery-powered applications. The ENABLE control pin is TTL compatible and driven by 1.5V beyond making the YB1900C an ideal level-shifting load switch. Output Capacitor Selection For proper slew operation, a 0.1μF or greater is recommended. The output capacitor has also no specific capacitor type requirement. If desired, COUT may be increased without limit to accommodate any load transient. Input Capacitor Selection A 1μF or larger input capacitor is recommended to prevent load transients from affecting upstream circuits. CIN should Reverse Output-to-Input Voltage Conditions and Protection Under normal conditions, there is a parasitic diode between the output & input of the load switch. In case of VOUT exceeding VIN, this would forward bias the internal parasitic diode and allow excessive current flow into the VOUT pin and possibly damage the load switch. be located as close to the device VIN pin as practically. No specific required type of capacitor is recommended for normal operation. However, for higher current operation, ceramic capacitors are recommended for CIN. YB1900C Rev.1.4 www.yobon.com.tw 6 YB1900C Ultra Low Quiescent Current Smart Load Switch In applications, where there is a possibility of VOUT exceeding VIN for brief periods of time during operation, the use of larger value CIN capacitor is highly recommended. A larger value of CIN with respect to COUT will affect a slower CIN decay rate during shutdown, thus preventing VOUT from exceeding VIN. In case of extended period of time for VOUT exceeding VIN, it is recommended to place a Schottky diode from VIN to VOUT. Thermal Considerations The YB1900C is designed to deliver a continuous load current. The maximum limit is package power dissipation. At any given ambient temperature, the maximum package power dissipation can be determined by the following equation: temperature is raised to 125℃, the RDS(MAX) will be increased to 180mΩ due to positive temperature coefficient, and IOUT(MAX) should be reduced to 1.5A. If the output load current were very close to IOUT(MAX) and the ambient temperature were to increase, the internal die temperature would increase, and the device would be damaged. PCB Layout Consideration To maximize YB1900C performance, some board layout rules should be followed: VIN and VOUT should be routed using wider than normal traces, and GND should be connected to a ground plane. For best performance, CIN and COUT should be placed close to the package pins. PD(MAX) = [TJ(MAX)-TA] / θJA Constraints for the YB1900C are maximum junction temperature TJ(MAX) = 125℃, and package thermal resistance, θJA = 220℃/W. The maximum continuous output current for YB1900C depends on package power dissipation and the RDS(ON) of MOSFET at TJ(MAX). Typical conditions are calculated under normal ambient condition where TA = 25℃. At 85℃, PD(MAX) = 181mW, and at TA = 25℃, PD(MAX) = 454mW. The maximum current is calculated by the following equation: IOUT < (PD(MAX) / RDS(MAX))1/2 For example, if VIN = 5V, RDS(MAX) = 130mΩ and TA = 25 ℃ , IOUT(MAX) = 1.8A. If YB1900C Rev.1.4 www.yobon.com.tw 7 YB1900C Ultra Low Quiescent Current Smart Load Switch Package Information (SOT23-5) D e1 e YB1900C Rev.1.4 www.yobon.com.tw 8 YB1900C Ultra Low Quiescent Current Smart Load Switch Package Information (SOT23-6) L2 L1 GAUGE PLANE t L C NOTICE: y The information described herein is subject to change without notice. y Yobon does not assume any responsibility for use of any circuitry or applications described herein, nor does it convey any patent license. YB1900C Rev.1.4 www.yobon.com.tw 9