Zakładka z wyszukiwarką danych komponentów |
|
SMB110 Arkusz danych(PDF) 3 Page - Summit Microelectronics, Inc. |
|
SMB110 Arkusz danych(HTML) 3 Page - Summit Microelectronics, Inc. |
3 / 34 page SMB110 Preliminary Information Summit Microelectronics, Inc 2099 2.3 5/3/2005 3 The SMB110 is a fully programmable DC-DC controller that monitors, margins, and cascade sequences. It has 5 voltage outputs, consisting of: two synchronous “buck” step-down controllers, one “boost” step-up controller, one “boost-buck” negative DC-DC controller, and one LDO. The SMB110 uses a fixed 800 kHz Pulse Width Modulation (PWM) control circuit. A type three voltage mode compensation network is used offering a cost effective solution without compromising the transient response. By utilizing external n and p–type MOSFET transistors the efficiency and load current can be customized to fit a wide array of system requirements. The SMB110 integrates two buck outputs that are capable of producing an output voltage less than the input voltage. Each buck output voltage is set by an internal resistor divider and a programmable voltage reference. The integrated resistor divider eliminates the cost and space necessary for external components and has several programmable values. Through the programmability of the reference and the resistor divider, practically any output voltage less than the battery can be produced without the need to change external components. In addition, the SMB110 integrates one boost output capable of producing an output voltage greater than the input voltage. The boost topology is asynchronous, using a rectifying Schottky diode and eliminating the need for an additional external MOSFET driver. An external p- channel sequencing MOSFET’s accompanies the boost channel in order to isolate the switching MOSFET from the battery when disabled. The SMB110 also contains one inverting buck-boost output capable of producing a negative output voltage less than or greater than, the input voltage. The buck boost output is asynchronous and drives an external p- channel MOSFET. A Low DropOut linear regulator with fixed 3.3 volt output provides a low current supply for “always on” microcontrollers. The LDO has a special input supply that is internally multiplexed between the LDO supply pin and the battery. This ensures that the LDO will always be active over the recommended operating voltages (2.7V – 6.0V). The SMB110 is capable of power-on/off cascade sequencing where each channel can be assigned one of four unique sequence positions. During sequencing each channel in a given sequence position is guaranteed to reach its programmed output voltage before the channel(s) occupying the next sequence position initiate their respective soft-start sequence. A unique programmable delay exists between each power on/off sequence position. In addition to power on/off sequencing all supplies can be powered on/off individually through an I 2C command or by assertion of an enable pin. Each output voltage is monitored for under-voltage and over-voltage (UV/OV) conditions, using a comparator- based circuit where the output voltage is compared against an internal programmable reference. An additional feature of the output voltage monitoring is a programmable glitch filter capable of digitally filtering a transient OV/UV fault condition from a true system error. When a fault is detected for a period in excess of the glitch filter, all supplies may be sequenced down or immediately disabled and one of two output status pins can be asserted. The current system status is always accessible via internal registers containing the status of all four channels. The SMB110 possesses an Undervoltage Lockout (UVLO) circuit to ensure the SMB110 will not power up until the battery voltage has reached a safe operating voltage. The UVLO function exhibits hysteresis, ensuring that noise or a brown out voltage on the supply rail does not inadvertently lead to a system failure. The SMB110 provides margining control over all of its output voltages. Through an I 2C command, all outputs can be margined to any voltage setting within the nominal output voltage rage. Margining creates three pre-programmed settings that each channel can be set to via an I 2C command. Margining is ideal when used with the boost channel configured as an LED driver where margining provides three brightness settings. In addition, each output is slew rate limited by soft-start circuitry that is user programmable and requires no external capacitors. All programmable settings on the SMB110 are stored in non-volatile registers and are easily accessed and modified over an industry standard I 2C serial bus. For fastest prototype development times Summit offers an evaluation card and a Graphical User Interface (GUI). GENERAL DESCRIPTION |
Podobny numer części - SMB110 |
|
Podobny opis - SMB110 |
|
|
Link URL |
Polityka prywatności |
ALLDATASHEET.PL |
Czy Alldatasheet okazała się pomocna? [ DONATE ] |
O Alldatasheet | Reklama | Kontakt | Polityka prywatności | Linki | Lista producentów All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |