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DMS1067P Dataheets PDF



Part Number DMS1067P
Manufacturers DMS
Logo DMS
Description monolithic step-down switch mode converter
Datasheet DMS1067P DatasheetDMS1067P Datasheet (PDF)

D1067 DESCRIPTION The DMS1067 is a monolithic step-down switch mode converter with a built in internal power MOSFET. It achieves 2A continuous output current over a wide input supply range with excellent load and line regulation. The DMS1067 requires a minimum number of readily available standard external components. Current mode operation provides fast transient response and eases loop stabilization. Fault condition protection includes cycle-bycycle current limiting and thermal shutdown. In shu.

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D1067 DESCRIPTION The DMS1067 is a monolithic step-down switch mode converter with a built in internal power MOSFET. It achieves 2A continuous output current over a wide input supply range with excellent load and line regulation. The DMS1067 requires a minimum number of readily available standard external components. Current mode operation provides fast transient response and eases loop stabilization. Fault condition protection includes cycle-bycycle current limiting and thermal shutdown. In shutdown mode the regulator draws 25µA of supply current. FEATURES • 2A Output Current • 0.22Ω Internal Power MOSFET Switch • Stable with Low ESR Output Ceramic Capacitors • Up to 95% Efficiency • 25µA Shutdown Mode • Fixed 420KHz Frequency • Thermal Shutdown • Cycle-by-Cycle Over Current Protection • Wide 4.75 to 25V Operating Input Range • Output Adjustable from 1.22V to 21V • Programmable Under Voltage Lockout APPLICATIONS • • • • Distributed Power Systems Battery Chargers Pre-Regulator for Linear Regulators PC Monitors 4.75 to 25 DMS1067 PACKAGE REFERENCE Part number DMS1067S DMS1067P Package SOIC8 PDIP8 Temperature –40°C to +125°C –40°C to +125°C REV:A2FYJ 2011-01-01 DMS Microelectronic Limited 1 TM D1067 Supply Voltage (VIN)..................................... 27V Switch Voltage (VSW)................ –1V to VIN + 1V Bootstrap Voltage (VBS) ...Vsw-0.3V to VSW + 6V Enable/UVLO Voltage (VEN)...........–0.3V to +6V Comp Voltage (VCOMP) ...................–0.3V to +6V Feedback Voltage (VFB) ................–0.3V to +6V Junction Temperature ........................... +150°C Lead Temperature ................................. +260°C Storage Temperature.............. –65°C to +150°C ABSOLUTE MAXIMUM RATINGS (1) Recommended Operating Conditions (2) Input Voltage (VIN) ......................... 4.75V to 25V Operating Temperature...............–40°C to +125°C Thermal Resistance(3) SOIC8 .................................... 105..... 50... °C/W PDIP8 ...................................... 95…...55.. °C/W Notes: 1) Exceeding these ratings may damage the device. 2) The device is not guaranteed to function outside of its operating conditions. 3) Measured on approximately 1” square of 1 oz copper. θJA θJC ELECTRICAL CHARACTERISTICS Parameter Feedback Voltage Upper Switch-On Resistance Lower Switch-On Resistance Upper Switch Leakage Current Limit Oscillator Frequency Short Circuit Frequency Maximum Duty Cycle Minimum Duty Cycle EN Shutdown Threshold Voltage EN UVLO Threshold Rising EN UVLO Threshold Hysteresis Enable Pull-Up Current Supply Current (Shutdown) Supply Current (Quiescent) Thermal Shutdown VIN = 12V, VEN = 5V,TA = +25°C, unless otherwise noted. Condition 4.75V ≤ VIN ≤ 25V Min 1.184 Typ 1.222 0.22 10 3.1 420 42 90 2.3 2.5 200 2 25 1.0 160 Max 1.258 Units V Ω Ω µA A KHz KHz % % V V mV µA µA mA °C VEN = 0V, VSW = 0V 2.4 370 VFB = 0V VFB = 1.0V VFB = 1.5V ICC > 100µA VEN Rising VEN = 0V VEN ≤ 0.4V ≥ 2.6V, VFB = 1.4V 10 470 2.0 2.0 0 2.5 3.0 VEN 50 1.5 REV:A2FYJ 2011-01-01 DMS Microelectronic Limited 2 TM D1067 PIN FUNCTIONS Pin # 1 Name BS Description High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-channel MOSFET switch. Connect a 10nF or greater capacitor from SW to BS to power the switch. Power Input. IN supplies the power to the IC, as well as the step-down converter switch. Drive In with a 4.75 to 25V power source. Bypass IN to GND with a suitably large capacitor to eliminate noise on the input to the IC. See Input Capacitor. Power Switching Output. SW is the switching node that supplies power to the output. Connect the output LC filter from SW to the output load. Note that a capacitor is required from SW to BS to power the high-side switch. Ground. Feedback Input. FB senses the output voltage to regulate that voltage. Drive FB with a resistive voltage divider from the output voltage. The feedback threshold is 1.222V. See Setting the Output Voltage. Compensation Node. COMP is used to compensate the regulation control loop. Connect a series RC network from COMP to GND to compensate the regulation control loop. See Compensation. Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to turn on the regulator, low to turn it off. For automatic startup, leave EN unconnected. No Connect. 2 3 IN SW 4 5 GND FB 6 COMP 7 8 EN NC REV:A2FYJ 2011-01-01 DMS Microelectronic Limited 3 TM D1067 OPERATION The DMS1067 is a current-mode step-down switch-mode regulator. It regulates input voltages from 4.75V to 25V down to an output voltage as low as 1.222V and is able to supply up to 2A of load current. The DMS1067 uses current-mode control to regulate the output voltage. The output voltage is measured at FB through a resistive voltage divider and amplified through the internal error amplifier. The output current of the transconductance error amplifier is presented at COMP where a network compensates the regulation control system. The v.


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