FUJITSU SEMICONDUCTOR DATA SHEET DS04-27604-2E ASSP For Power Supply Applications Power Management 2-ch Switch IC MB3842/MB3845 ■ DESCRIPTION The MB3842/3845 is a power management switch with built-in 2-channel low-on resistance (typ. 100mΩ) switch. Output control is by means of a control signal, and the MB3842 is designed for high-active operation (output on when EN is Hi), while the MB3845 is designed for low-active operation (output on when EN is low.) To provide adaptability to a variety of operations, the MB3842/3845 features low input voltage (VIN > 2.5V) operation and stable low-on resistance independent of input voltage. The switching current limit can be set from 100mA to 600mA by using external resistance, and when overcurrent conditions are detected the OC output goes low to provide an external notification signal. VIN is divided between the two channels, which operate independently of each other. In addition, an off-state reverse current prevention function is provided to ensure accurate on/off switching action. ■ FEATURES • • • • • • • • • • Low on resistance switch (typ. 100mΩ) Low input voltage operation (2.5 V to 5.5 V) Switch current (max. 0.6 A) UVLO :VIN threshold 2.3V/2.1 V hysteresis 200 mV ENABLE :EN threshold EN 1.4V/1.6 V for MB3842, EN 1/2 VIN for MB3845 :Power supply current at output off = 0µA EN < 0.8V for MB3842, EN = VIN for MB3845 External setting for soft start time and switch current limit. Over-temperature detection (switch latched off), over-current detection (not latched) OC pin flag set following overcurrent detection, over-temperature detection, or UVLO detection. Reverse current prevention at OFF (VIN ≥ 1.5 V) Either channel may be operated alone. ■ PACKAGE 20-pin plastic SSOP (FPT-20P-M03) MB3842/MB3845 ■ PIN ASSIGNMENT EN1, EN1 1 20 GND SS1 2 19 OC1 CS1 3 18 OUT1 VIN1 4 17 OUT1 SSOP-20P (FPT-20P-M03) VIN1 5 16 OUT1 VIN2 6 15 OUT2 VIN2 7 14 OUT2 CS2 8 13 OUT2 SS2 9 12 OC2 EN2, EN2 10 11 GND EN Enable EN Enable CS Current Set OC Over Current SS Slow Start The functions of pin 1 and pin 10 differ on the MB3842 and MB3845. EN for MB3842/EN for MB3845 2 MB3842/MB3845 ■ PIN DESCRIPTION Pin no. Symbol Descriptions EN (MB3842) Control signal input pin. Set “H” to turn switch on, “L” to turn toff. At 0.8 V or less, the chip is in STBY state and current consumption is less than 1µA. “L” level is 1.4V (typ), “H” level is 1.6V (typ), with 200mV (typ) hysteresis. EN (MB3845) Control signal input pin. Set “L” to turn switch on, “H” to turn off. At “H” level = VIN, the chip is in STBY state and current consumption is less than 1µA. Normally used as CMOS inverter input, so that recommended use is “L” level at GND +0.5V or less, and “H” level is VIN -0.5V or greater. 2/9 SS Slow start setting pin. Used to adjust the switch on/off timing. Add external capacitance to delay operation. Leave open when not in use. In open mode voltages up to 12 V are present. Care should be taken in mounting to prevent leakage current generation because high impedance is required. 3/8 CS Current limit setting pin. The limit current level is set by connecting this pin to external resistance. 4/5/6/7 VIN Switch output pin. An UVLO (VIN power monitor function) is provided so that when VIN reaches 2.3V (typ.) or higher the OC pin voltage goes to “H” level. Also if the VIN voltage drops to 2.1 V (typ.) or lower the OC output goes to “L” state. 200mV (typ) hysteresis is provided. 11/20 GND Ground pin. 1/10 12/19 OC 13/14/15 16/17/18 OUT External notification pin. When the switch is in on mode this pin normally outputs a “H” level signal, but changes to “L” level when an overcurrent, overtemperature, or UVLO condition is detected. This is an open drain connection, and should be pulled up to high potential using resistance. Switching output pin.(N-ch MOSFET source) 3 MB3842/MB3845 ■ BLOCK DIAGRAM (for 1 channel) MB3842 OUT1 SS1 CS1 Over current detection 1 Charge pump1 Q S + COMP − FF1 R EN1 + COMP − OSC1 OC1 VIN1 BGR1 Temperature protection 1 MB3845 OUT1 Charge pump1 SS1 CS1 Over current detection 1 Q S + COMP − FF1 R EN1 OSC1 VIN1 BGR1 Temperature protection 1 4 + COMP − OC1 MB3842/MB3845 ■ ABSOLUTE MAXIMUM RATINGS Parameter Symbol Condition Input voltage VIN ENABLE voltage Rating Unit Max. Min. — –0.3 7.0 V VEN — –0.3 7.0 V Switch current ISW — — 1.8 A Power dissipation PD — 216 mW –55 +125 °C Storage temperature Ta = +85°C — TSTG WARNING: Semiconductor devices can be permanently damaged by application of stress (voltage, current, temperature, etc.) in excess of absolute maximum ratings. Do not exceed these ratings. ■ RECOMMENDED OPERATING CONDITIONS Parameter Symbol Condition Input voltage VIN — ENABLE voltage VEN Switch current ISW SS pin capacitance CSS* OC sink current IOCS Current limit resistance RLIM* Operating temperature TOP Value Unit Min. Typ. Max. 2.5 5.0 5.5 V VEN ≤ VIN 0 — 5.5 V VIN = 2.5 V to 5.5 V — — 0.6 A — — 10 nF VIN = 5.0 V, VOC = 0.4 V 2.0 5.0 — mA VIN = 5.0 V (ISW = 0.6 A) 1.4 2.0 2.6 kΩ VIN = 5.0 V (ISW = 0.1 A) 3.6 6.2 9.1 kΩ –20 — +85 °C — — * : For CSS, RLIM settings, see “TYPICAL CHARACTERISTICS” and “FUNCTIONAL DESCRIPTION”. WARNING: The recommended operating conditions are required in order to ensure the normal operation of the semiconductor device. All of the device's electrical characteristics are warranted when the device is operated within these ranges. Always use semiconductor devices within their recommended operating condition ranges. Operation outside these ranges may adversely affect reliability and could result in device failure. No warranty is made with respect to uses, operating conditions, or combinations not represented on the data sheet. Users considering application outside the listed conditions are advised to contact their FUJITSU representatives beforehand. 5 MB3842/MB3845 ■ ELECTRICAL CHARACTERISTICS (per 1 ch) • MB3842/MB3845 Parameter Switch resistance IN pin input current UVLO threshold UVLO hysteresis width Switch current limit OC sink current Symbol Condition Min. RON ISW =0.6A — 100 150 mΩ IIN1 ISW = 0 A — 350 550 µA IIN2 ISW = 0.6 A — 1.0 1.5 mA IIN3 EN < 0.8V for MB3842, EN = VIN for MB3845 — — 1.0 µA VIUH VIN at OC = L → H 2.1 2.3 2.5 V VIUL VIN at OC = H → L 1.9 2.1 2.3 V VIUHY VIUHY = VIUH – VIUL 100 200 300 mV ISWH RLIM = 2.0 kΩ 0.42 0.6 0.78 A ISWL RLIM = 6.2 kΩ 0.06 0.1 0.14 A IOCS VOC = 0.4 V at OC active 2.0 5.0 — mA IOCL VOC = 5.0 V at OC non-active — — 1.0 µA +125 — — °C Temperature protection (Tj) TLIM OUT pin rise time tON SS pin: Open OUT pin: 100 kΩ pull down — 100 200 µs OUT pin fall time tOFF SS pin: Open OUT pin: 100 kΩ pull down — 50 120 µs — • MB3842 Parameter ENABLE pin input current Symbol Condition Min. (VIN = 5 V, Ta = +25°C) Value Unit Typ. Max. IENH VEN = 5 V, ISW = 0 A — 5 10 µA IENL VEN = 0 V, ISW = 0 A — 0.0 — µA ENABLE pin threshold voltage VTHEN — 1.45 1.60 1.75 V VTLEN — 1.25 1.40 1.55 V ENABLE hysteresis width VENHY VENHY = VTHEN – VTLEN 100 200 300 mV • MB3845 Parameter ENABLE pin input current ENABLE pin input voltage 6 (VIN = 5 V, Ta = +25°C) Value Unit Typ. Max. Symbol Condition Min. (VIN = 5 V, Ta = +25°C) Value Unit Typ. Max. IENH VEN = 5 V, ISW = 0 A — 0.0 — µA IENL VEN = 0 V, ISW = 0 A — 0.0 — µA VILEN — 0 — 0.8 V VIHEN — 3.0 — 5.0 V MB3842/MB3845 ■ DIAGRAM • Normal operation 5V VIN Hi EN EN Low SW OFF SW ON SW ON 5V VOUT IOUT Overcurrent does not occur OC 5V • At VIN fall 5V 2.3 V VIN 2.1 V Hi EN EN Low SW ON SW ON SW ON 5V VOUT Overcurrent does not occur IOUT 5V OC =0V Note: The OC pin should be pulled up using a separate power supply and resistance. (This illustration shows pull-up with a separate 5V source.) (Continued) 7 MB3842/MB3845 (Continued) • At overcurrent detection 5V VIN Hi EN EN Low SW ON OFF ON OFF 5V VOUT IOUT 5V OC =0V • At over-temperature occurrence 5V VIN Over-temperature occurs Over-temperature corrected Hi EN EN Low SW ON SW OFF 5V VOUT Overcurrent does not occur IOUT 5V OC =0V Latch set Latch released Note: The OC pin should be pulled up using a separate power supply and resistance. (This illustration shows pull-up with a separate 5V source.) 8 MB3842/MB3845 ■ TYPICAL CHARACTERISTICS • RLIM vs. limit current characteristics These are the limiting value characteristics for CS pin-to-GND external resistance and output current (OC flag). 10 ISW(A) 1 VIN = 5.0 V VIN = 3.3 V VIN = 2.5 V 0.1 0.01 100 1000 10000 100000 RLIM (Ω) • CSS vs. TON (SS) characteristics There are the characteristics for SS pin-to-GND external capacitance and output ON time. 100 tON(ms) 10 VIN = 5.0 V VIN = 3.3 V VIN = 2.5 V 1 0.1 10 100 1000 10000 100000 CSS (pF) (Continued) 9 MB3842/MB3845 (Continued) • SW resistance vs. temperature characteristics 150 140 SW resistance (mΩ) 130 120 110 at 0.1 A at 0.6 A at 1 A 100 90 80 70 60 50 −60 −40 −20 0 20 40 60 80 100 120 Temperature Ta (°C) • Temperature-depended SW resistance vs. VIN (V) characteristics 150 SW resistance (mΩ) 140 130 120 110 −40 °C 25 °C 100 °C 100 90 80 70 60 50 2 3 4 5 6 7 VIN voltage (V) (Continued) 10 MB3842/MB3845 (Continued) • Output power (ISW) saturation characteristics 5V Measurement circuit VIN EN, EN VIL/VIH OC ISW SS “Open” OUT CS A 2Ω GND 100 kΩ RLIM VSW 5V These are the output saturation current characteristics in overcurrent state.(when not controlled by the OC pin warning flag) 1600 1400 RLIM not limited (CS GND) 1200 ISW (mA) 1000 RLIM set to 2.0kΩ, 0.6A Unlimited 6.2 k (0.1 A) 2 k (0.6 A) 800 Overcurrent flag set (when set for 0.6A) 600 Temperature protection range 400 RLIM set to 6.2kΩ, 0.1A Overcurrent flag set (when set for 0.1A) 200 0 0 1 2 3 VSW (V) 4 5 6 (Continued) 11 MB3842/MB3845 (Continued) • OC pin flag pull-up resistance (pull-up power 5V) dependant overcurrent operation 1 V / 500 NS 1 kΩ 1 V / 500 NS 50 kΩ 1 V / 500 NS 10 kΩ 1 V / 500 NS 100 kΩ GND • Power derating characteristics 1 0.9 Power dissipation PD (W) 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 −20 0 20 40 Temperature Ta (°C) 12 60 80 100 MB3842/MB3845 ■ FUNCTIONAL DESCRIPTION Current Limit Setting By placing resistance between the CS and GND pins, the current limit can be set between 100mA and 600mA within ±30% accuracy (VIN = 5 V, current limit at 600mA). Because the setting value is dependent on VIN voltage, the user should select the optimum resistance value for the value of VIN voltage . When the switching current exceeds the set value, the OC pin goes to “L” level as an external notification signal, but there is no latching function. To hold operation on “off” state, the input signal to the EN and EN pins should be used. When a direct connection to GND is used, there is no current limitation. When the connection is open, the switch is in a state of continuously held current limits. Thermal Shutdown The MB3842/MB3845 has a thermal shutdown function which turns the switch off and sets the latch to protect the device when junction temperature exceeds 125°C. At the same time the OC output signal goes to “L” level to notify external systems. The latch function can be reset by sending a low signal to the EN input of the MB3842, or a high signal to the EN input of the MB3845. Slow Start The on/off switching time can be delayed by applying capacitance between the SS and GND pins. Controlling the on time can soften surge current to the load side capacitance when power is turned on. For details, see “Css vs. tON (SS) characteristics” on p. 9. UVLO A VIN voltage monitoring function is provided, so that when VIN voltage exceeds 2.3 V (typ) the OC pin voltage goes to “H” level. When VIN voltage falls below 2.1V (typ), the OC output goes to “L” state. Error Flag OC Pin The OC pin produces a “L” signal in case of a UVLO, overcurrent, or over-temperature condition. In case of overcurrent, the output has a pulse waveform. See P12. (note) Output current limit setting resistance values are shown on P9, and in the following table. (CS pin-to-GND) Standard Values VIN/ISW 0.1 A 0.2 A 0.3 A 0.4 A 0.5 A 0.6 A 0.7 A 0.8 A 0.9 A 1.0 A VIN 5.0V 6.2 kΩ 4.3 kΩ 3.3 kΩ 2.7 kΩ 2.2 kΩ 2.0 kΩ 1.8 kΩ 1.6 kΩ 1.4 kΩ 1.3 kΩ VIN 3.3V 9.1 kΩ 5.6 kΩ 4.3 kΩ 3.3 kΩ 2.7 kΩ 2.4 kΩ 2.0 kΩ 1.8 kΩ 1.6 kΩ 1.5 kΩ VIN 2.5V 13 kΩ 7.5 kΩ 5.1 kΩ 3.9 kΩ 3.0 kΩ 2.7 kΩ 2.2 kΩ 2.0 kΩ 1.8 kΩ 1.6 kΩ 13 MB3842/MB3845 ■ TYPICAL APPLICATION Top View MB3842/MB3845 EN1 EN1 Control signal GND Pull-up resistance CSS SS1 OC1 CS1 OUT1 VIN1 OUT1 VIN1 OUT1 VIN2 OUT2 VIN2 OUT2 CS2 OUT2 RLIM Load Load RLIM Pull-up resistance CSS Control signal 14 SS2 OC2 EN2 EN2 GND MB3842/MB3845 ■ APPLICATION EXAMPLE (1) Dual-Port Self-Powered Hub Application (NON-GANG Mode Connection) USB 5 V Controller Overcurrent MB3842/MB3845 ON/OFF Power Supply EN1,EN1 GND SS1 OC1 CS1 OUT1 VIN1 OUT1 USB Port 1 VIN1 OUT1 VIN2 OUT2 5V USB Port 2 VIN2 OUT2 CS2 OUT2 SS2 OC2 EN2,EN2 GND *The MB3842 can also be adapted for use with 3.3V controllers. USB Port 500mA MAX Par Port Smoothing capacitors should be placed between VIN and GND, or between OUT and GND as required. 15 MB3842/MB3845 (2) Dual-Port Bus Powered Hub Application (GANG Mode Connection) USB Overcurrent MB3842/MB3845 ON/OFF EN1,EN1 GND SS1 OC1 CS1 OUT1 VIN1 OUT1 USB Port1(×4) 400 mA MAX (100 mA ×4) 5V Upstream Port VIN1 OUT1 VIN2 OUT2 VIN2 OUT2 CS2 OUT2 USB Port2(×4) 400 mA MAX (100 mA ×4) SS2 OC2 EN2,EN2 GND USB Port 100mA MAX Par Port Smoothing capacitors should be placed between VIN and GND, or between OUT and GND as required. 16 MB3842/MB3845 ■ USAGE PRECAUTION 1. Never use settings exceeding maximum rated conditions. Exceeding maximum rated conditions may cause permanent damage to the LSI. Also, it is recommended that recommended operating conditions be observed in normal use. Exceeding recommended operating conditions may adversely affect LSI reliability. 2. Use this device within recommended operating conditions. Recommended operating conditions are values within which normal LSI operation is warranted. Standard electrical characteristics are warranted within the range of recommended operating conditions and within the listed conditions for each parameter. 3. Printed circuit board ground lines should be set up with consideration for common impedance. 4. Take appropriate static electricity measures. • • • • Containers for semiconductor materials should have anti-static protection or be made of conductive material. After mounting, printed circuit boards should be stored and shipped in conductive bags or containers. Work platforms, tools, and instruments should be properly grounded. Working personnel should be grounded with resistance of 250 kΩ to 1 MΩ between body and ground. 5. Do not apply negative voltages. The use of negative voltages below –0.3 V may create parasitic transistors on LSI lines, which can cause abnormal operation. 6. Reverse Current Prevention Function Current cannot flow back to the VIN pin with the switch off, even when the OUT pin voltage is higher than the VIN pin (OUT ≥ VIN), however when VIN pin voltage is lower than 1.5 V circuit functions are lost, so that in this case there is danger of reverse current flow. For applications in which reverse flow is not acceptable, set VIN ≥ 1.5 V. ■ ORDERING INFORMATION Part number MB3842PFV MB3845PFV MB3845PFV-ER Package Remarks 20-pin Plastic SSOP (FPT-20P-M03) 17 MB3842/MB3845 ■ PACKAGE DIMENSION *: These dimensions do not include resin protrusion. 20-pin plastic SSOP (FPT-20P-M03) +0.20 * 6.50±0.10(.256±.004) 1.25 –0.10 +.008 .049 –.004 (Mounting height) 0.10(.004) INDEX 0.65±0.12 (.0256±.0047) 5.85(.230)REF C 18 1994 FUJITSU LIMITED F20012S-2C-4 * 4.40±0.10 6.40±0.20 (.173±.004) (.252±.008) +0.10 "A" 5.40(.213) NOM +0.05 0.22 –0.05 0.15 –0.02 +.004 –.002 .006 –.001 .009 Details of "A" part +.002 0.10±0.10(.004±.004) (STAND OFF) 0 10° 0.50±0.20 (.020±.008) Dimensions in mm (inches). MB3842/MB3845 FUJITSU LIMITED For further information please contact: Japan FUJITSU LIMITED Corporate Global Business Support Division Electronic Devices KAWASAKI PLANT, 4-1-1, Kamikodanaka Nakahara-ku, Kawasaki-shi Kanagawa 211-8588, Japan Tel: 81(44) 754-3763 Fax: 81(44) 754-3329 http://www.fujitsu.co.jp/ North and South America FUJITSU MICROELECTRONICS, INC. Semiconductor Division 3545 North First Street San Jose, CA 95134-1804, USA Tel: (408) 922-9000 Fax: (408) 922-9179 Customer Response Center Mon. - Fri.: 7 am - 5 pm (PST) Tel: (800) 866-8608 Fax: (408) 922-9179 http://www.fujitsumicro.com/ Europe FUJITSU MICROELECTRONICS EUROPE GmbH Am Siebenstein 6-10 D-63303 Dreieich-Buchschlag Germany Tel: (06103) 690-0 Fax: (06103) 690-122 http://www.fujitsu-fme.com/ Asia Pacific FUJITSU MICROELECTRONICS ASIA PTE LTD #05-08, 151 Lorong Chuan New Tech Park Singapore 556741 Tel: (65) 281-0770 Fax: (65) 281-0220 http://www.fmap.com.sg/ All Rights Reserved. The contents of this document are subject to change without notice. Customers are advised to consult with FUJITSU sales representatives before ordering. The information and circuit diagrams in this document are presented as examples of semiconductor device applications, and are not intended to be incorporated in devices for actual use. Also, FUJITSU is unable to assume responsibility for infringement of any patent rights or other rights of third parties arising from the use of this information or circuit diagrams. FUJITSU semiconductor devices are intended for use in standard applications (computers, office automation and other office equipment, industrial, communications, and measurement equipment, personal or household devices, etc.). CAUTION: Customers considering the use of our products in special applications where failure or abnormal operation may directly affect human lives or cause physical injury or property damage, or where extremely high levels of reliability are demanded (such as aerospace systems, atomic energy controls, sea floor repeaters, vehicle operating controls, medical devices for life support, etc.) are requested to consult with FUJITSU sales representatives before such use. The company will not be responsible for damages arising from such use without prior approval. Any semiconductor devices have an inherent chance of failure. You must protect against injury, damage or loss from such failures by incorporating safety design measures into your facility and equipment such as redundancy, fire protection, and prevention of over-current levels and other abnormal operating conditions. If any products described in this document represent goods or technologies subject to certain restrictions on export under the Foreign Exchange and Foreign Trade Law of Japan, the prior authorization by Japanese government will be required for export of those products from Japan. F0001 FUJITSU LIMITED Printed in Japan 19