DS4560

DS4560 MAXIM | Alldatasheet

Document overview

• Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
• PDF pages: 8

Technical content

Features

♦ On-Board 25mΩ Power MOSFET ♦ Adjustable Short-Circuit Current and Overload Current Limit ♦ Adjustable Output-Voltage Slew Rate ♦ Adjustable Power-Up Timer with External Enable Capability ♦ Output Overvoltage Limiting ♦ On-Board Thermal Protection ♦ On-Board Charge Pump ♦ Latchoff and Autoretry Versions Available ♦ 9.0V to 13.2V Supply Operation ♦ 8-Pin SO (150 mils) Pb-Free Package ♦ UL Certification Record E211395 DS4560 12V Hot-Plug Switch SO (150 mils) TOP VIEW 2 7 LOADVRAMP

18 V CCGND

Ordering Information

19-4619; Rev 2; 5/09 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. +Denotes a lead(Pb)-free/RoHS-compliant package. T = Tape and reel. PART THERMAL SHUTDOWN PIN-PACKAGE DS4560S-LO+ Latchoff 8 SO DS4560S-LO+T Latchoff 8 SO DS4560S-AR+ Autoretry 8 SO DS4560S-AR+T Autoretry 8 SO Pin Description PIN NAME FUNCTION 1 GND Ground. This is also a heat sink for the device.

2 VRAMP Output-Voltage Ramp Adjustment

3 TIMER Power-Up Timer/Enable

4 ILIM Current-Limit Adjustment

5, 6, 7 LOAD Output Load Connection (MOSFET Source)

8 V CC Input Supply Voltage (MOSFET Drain)

PCI Express is a registered trademark of PCI-SIG Corp. InfiniBand is a trademark and service mark of the InfiniBand Trade Association. RAID/Hard Drives Servers/Routers PCI/PCI Express InfiniBandSM Base Stations

RECOMMENDED OPERATING CONDITIONS (TJ = -40°C to +135°C.) Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Voltage Range on VCC and LOAD Relative to GND Voltage Range on ILIM and VRAMP CC + 0.3V), but not to exceed +18V Drain Current J-STD-020 Specification. PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V CC (Notes 1, 2) 9.0 13.2 V RILIM Value R ILIM 20 400 CVRAMP Value C VRAMP 0.04 5.00 μF CTIMER Value C TIMER 0.04 5.00 μF TIMER Turn-On Voltage V ON 2.6 5 V TIMER Turn-Off Voltage V OFF -0.3 +2.0 V

ELECTRICAL CHARACTERISTICS

(VCC = +12V, TJ = +25°C, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Current I CC (Note 3) 1.1 2.00 mA UVLO Rising V UVLOR 7.5 8.0 8.5 V UVLO Falling V UVLOF 6.5 7.0 7.5 V UVLO Hysteresis V UVLOH 1 V On-Resistance R ON 25 32 m MOSFET Output Capacitance C OUT 500 pF LOAD Voltage During Off State V LOFF (Note 4) 200 mV Delay Time from Enable to Beginning of Conduction tPOND C VRAMP = 1μF 5 ms Gate-Charging Time from Conduction to 90% of V OUT tGCT C VRAMP = 1μF, CLOAD = 1000μF 48 66 80 ms Shutdown Junction Temperature T SHDN (Note 5) 120 135 150 °C Thermal Hysteresis T HYS (Note 5) 40 °C TIMER Charging Current I TIMER 70 80 92 μA Overvoltage Clamp V OVC 13.5 15.0 16.5 V

Note 1: All voltages are referenced to ground. Currents entering the IC are specified positive and currents exiting the IC are negative. Note 2: This supply range guarantees that the LOAD voltage is not clamped by the overvoltage limit. Note 3: Supply current specified with no load on the LOAD pin. Note 4: VLOFF voltage specified with a 2.5mA load applied to LOAD. Note 5: Not production tested. Guaranteed by design. Note 6: ISCL is the current limit when the output voltage is initially ramping up. Note 7: IOVL is the current limit after the output voltage ramping is complete. ELECTRICAL CHARACTERISTICS (continued) (VCC = +12V, TJ = +25°C, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Short-Circuit Limit I SCL R ILIM = 56 (Note 6) 2.0 2.5 3.0 A Overload Limit I OVL R ILIM = 56 (Note 7) 3.5 4.4 5.9 A LOAD Voltage Slew Rate SR LOAD C VRAMP = 1μF 0.13 0.15 0.18 V/ms VRAMP Charging Current I VRAMP 70 80 92 μA CURRENT LIMIT vs. RILIM DS4560 toc01 RILIM (Ω) CURRENT LIMIT (A) 100 0.1 100010 IOVL ISCL CURRENT LIMIT vs. TEMPERATURE DS4560 toc02 TEMPERATURE (°C) CURRENT LIMIT (A) 12010080604020-20 0 -40 140 IOVL ISCL OVERVOLTAGE CLAMP vs. TEMPERATURE DS4560 toc03 TEMPERATURE (°C) OVERVOLTAGE CLAMP (V) 12010080604020-20 0 15.2 15.4 15.6 15.8 16.0 16.2 16.4 15.0 -40 140 NO LOAD 10Ω LOAD ON-RESISTANCE vs. TEMPERATURE DS4560 toc04 TEMPERATURE (°C) RON (mΩ) 120100806040200-20 -40 140 SUPPLY CURRENT vs. TEMPERATURE DS4560 toc05 TEMPERATURE (°C) ICC (mA) 120100-20 0 20 6040 80 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 -40 140 TYPICAL DS4560 TURN-ON WAVEFORMS VCC = 18V, 10Ω RESISTIVE LOAD DS4560 toc06 VCC 5V/div TIMER LOAD VRAMP 2ms/div Typical Operating Characteristics (VCC = 12V, TA = +25°C, RILIM = 56Ω, VCC = 12V, CTIMER = 0.1µF, CVRAMP = 0.1µF, unless otherwise noted.)

Typical Operating Characteristics (continued) (VCC = 12V, TA = +25°C, RILIM = 56Ω, VCC = 12V, CTIMER = 0.1µF, CVRAMP = 0.1µF, unless otherwise noted.) TURN-ON WAVEFORMS 10Ω RESISTIVE LOAD DS4560 toc07 VCC LOAD LOAD CURRENT 2V/div 0mA 500mA/div 5ms/div TURN-ON WAVEFORMS 3300μF CAPACITIVE LOAD DS4560 toc08 VCC LOAD LOAD CURRENT 2V/div 0mA 500mA/div 5ms/div TURN-ON WAVEFORMS VCC = 18V, 10Ω RESISTIVE LOAD DS4560 toc09 VCC LOAD LOAD CURRENT 5V/div 0mA 500mA/div 5ms THERMAL SHUTDOWN WITH AUTORETRY DS4560S-AR+, VCC = 18V, 10Ω RESISTIVE LOAD DS4560 toc10 VCC LOAD LOAD CURRENT 5V/div 500mA/div 0mA 500ms/div

+5V 2.5V UVLO CURRENT LIMIT CHARGE PUMP LOAD +5V VREG OVERVOLTAGE LIMIT GND R R RILIM LOAD ILIM +12V VCC VRAMP VCC 80μA 80μA CVRAMP Block Diagram/Typical Application Circuit DS4560 12V Hot-Plug Switch Detailed Description The DS4560 begins to operate when V CC exceeds the undervoltage lockout level, V UVLOR. At this level, the enable circuit and TIMER pin become active. Once the device has been enabled, a gate voltage is applied to the power MOSFET, allowing current to begin flowing from V CC to LOAD. The speed of the output-voltage ramp is controlled by the capacitance placed at the VRAMP pin. The load current is continuously monitored during the initial voltage ramping (I SCL) and during nor- mal operation (IOVL). If the current exceeds the current limit that is set by the external resistance at ILIM, the gate voltage of the power MOSFET is decreased, reducing the output current to the set current limit. Current is limited by the DS4560 comparing the voltage difference between the LOAD and ILIM pins to an inter- nal reference voltage. If the output current exceeds the limit that is set by the R ILIM resistor, the gate voltage of the power MOSFET is decreased, which reduces the output current to the load. When the output power is initially ramping up, the current limit is I SCL. Once the voltage ramping is complete, the current limit is IOVL. The lower ISCL current limit protects the source if there is a dead short on initial power-up. The DS4560 acts as a fuse and automatically disables the current flowing to the load when the temperature of the power MOSFET has exceeded the shutdown junc- tion temperature, T SHDN.

TIMER pin be tested to ensure proper operation. POND) until conduction begins from V CC to LOAD. ed to the TIMER pin to enable or disable the device. When the TIMER pin is held low, the device is disabled. level, and the gate can sink the ITIMER current. TIMER as in the delayed mode. the Thermal Shutdown with Autoretry graph for details. Table 1. TIMER Pin Modes Automatic Enable No connection to TIMER pin. Delayed Automatic Enable Capacitor C TIMER connected to TIMER. Enable/Disable Open-collector device. Enable with Delay/Disable Open-collector device and C TIMER.

Latchoff Version (DS4560S-LO) Once the latchoff version has entered thermal shut- down, it does not attempt to turn back on. The only way to turn this device back on is to cycle the power to the device. When power is reapplied to V CC, the junction temperature needs to be less than T SHDN for the device to be enabled. Overvoltage Limit The overvoltage-limiting clamp monitors the VRAMP level compared to an internal voltage reference. When the voltage on VRAMP exceeds V OVC/2, the gate volt- age of the n-channel power MOSFET is reduced, limit- ing the voltage on LOAD to V OVC even as V CC increases. If the device is in overvoltage for an extend- ed period of time, the device may overheat and enter thermal shutdown. This is caused by the power created by the voltage drop across the power MOSFET and the load current. See the Thermal Shutdown with Autoretry graph for details. Applications Information The GND pin of the DS4560 is also a heat sink for the device. This pin should be connected to a large trace or plane capable of dissipating heat from the device. PACKAGE TYPE PACKAGE CODE DOCUMENT NO.

8 SO — 21-0041

Package Information

For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circu it patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.

Revision History

0 6/08 Initial release. — 1 9/08 In the Recommended Operating Conditions , changed the TIMER Turn-On Voltage (VON) maximum specification from “V CC + 0.3V” to “5V.” 2 2 5/09 Added the UL certification number to the Features section. 1