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CS5111YDWFR24 Datasheet(PDF) 1 Page - Cherry Semiconductor Corporation |
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CS5111YDWFR24 Datasheet(HTML) 1 Page - Cherry Semiconductor Corporation |
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1 / 10 page  1 Features s Linear Regulator 5V ± 2% @ 100mA s Switching Regulator 1.4A Peak Internal Switch 120kHz Maximum Switching Frequency 5V to 26V Operating Supply Range s Smart Functions Watchdog s Protection Overvoltage Overtemperature Current Limit s 54V Peak Transient Capability ENABLE RESET Package Option 24 Lead SO Wide (Internally Fused Leads) 1.4A Switching Regulator with 5V, 100mA Linear Regulator with Watchdog, RESET and ENABLE 1 VREG VLIN IBIAS Gnd Gnd Gnd Gnd RESET CDelay WDI COSC VIN NC NC VSW Gnd Gnd Gnd Gnd VFB1 VFB2 SELECT COMP ENABLE CS5111 Description Over Temperature VIN Linear Error Amplifier 1.25V VREG 1.4A VSW COMP VFB1 VFB2 SELECT VLIN IBIAS CDELAY Over Voltage RESET & Watchdog Timer Current Limit WDI COSC Base Drive RESET Gnd Bandgap Reference Oscillator Multiplexer - COMP Logic Switcher Shutdown Switcher Error Amplifier Current Sense Amplifier ENABLE Block Diagram The CS5111 is a dual output power sup- ply integrated circuit. It contains a 5V ±2%, 100mA linear regulator, a watchdog timer, a linear output voltage monitor to provide a Power On Reset (POR) and a 1.4A current mode PWM switching reg- ulator. The 5V linear regulator is comprised of an error amplifier, reference, and super- visory functions. It has low internal sup- ply current consumption and provides 1.2V (typical) dropout voltage at maxi- mum load current. The watchdog timer circuitry monitors an input signal (WDI) from the micro- processor. It responds to the falling edge of this watchdog signal. If a correct watchdog signal is not received within the externally programmable time, a reset signal is issued. The externally programmable active reset circuit operates correctly for an out- put voltage (VLIN) as low as 1V. During power up, or if the output voltage shifts below the regulation limit, tog- gles low and remains low for the duration of the delay after proper output voltage regulation is restored. Additionally a reset pulse is issued if the correct watchdog is not received within the programmed time. Reset pulses continue until the cor- rect watchdog signal is received. The reset pulse width and frequency, as well as the Power On Reset delay, are set by one external RC network. The current mode PWM switching regu- lator is comprised of an error amplifier with selectable feedback inputs, a cur- rent sense amplifier, an adjustable oscil- lator, and a 1.4A output power switch with anti-saturation control. The switch- ing regulator can be configured in a variety of topologies. The CS5111 is load dump capable and has protection circuitry which includes overvoltage shutdown, current limit on the linear and switcher outputs, and an overtemperature limiter. RESET Rev. 12/28/98 Cherry Semiconductor Corporation 2000 South County Trail, East Greenwich, RI 02818 Tel: (401)885-3600 Fax: (401)885-5786 Email: info@cherry-semi.com Web Site: www.cherry-semi.com A Company ® |
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