Features: • 4.5V to 32V Input voltage range
• 1.25V to 6V Output voltage range
• 95% efficiency
• 300kHz oscillator frequency
• Current sense blanking
• 5 impedance MOSFET Drivers
• Drives N-channel MOSFETs
• 600A typical quiescent current (skip-mode)
• Logic controlled micropower shutdown (IQ < 0.1A)
• Current-mode control
• Cycle-by-cycle current limiting
• Built-in undervoltage protection
• Adjustable undervoltage lockout
• Easily synchronizable
• Precision 1.245V reference output
• 0.6% total regulation
• 16-pin SOP and SSOP packages
• Frequency foldback overcurrent protection
• Sustained short-circuit protection at any input voltage
• 20A output current capabilityApplication• DC power distribution systems
• Notebook and subnotebook computers
• PDAs and mobile communicators
• Wireless modems
• Battery-operated equipmentPinout
SpecificationsAnalog Supply Voltage (VIN) ........................................+34V
Digital Supply Voltage (VDD) ..........................................+7V
Driver Supply Voltage (BST) .....................................VIN +7V
Sense Voltage (VOUT, CSH) ............................. 7V to 0.3V
Sync Pin Voltage (VSYNC) ................................ 7V to 0.3V
Enable Pin Voltage (VEN/UVLO) ..................................... VIN
Power Dissipation (PD)
SOP................................................... 400mW @ TA= 85°C
SSOP ................................................ 270mW @ TA= 85°C
Ambient Storage Temperature (TS) .... 65°C to +150°CDescriptionMicrel's MIC2182 is a synchronous buck (step-down) switching regulator controller. An all N-channel synchronous architecture and powerful output drivers allow up to a 20A output current capabilty. The PWM and skip-mode control scheme MIC2182 allows efficiency to exceed 95% over a wide range of load current, making it ideal for battery powered applications, as well as high current distributed power supplies.
The MIC2182 operates from a 4.5V to 32V input and can operate with a maximum duty cycle of 86% for use in low-dropout conditions. It also features a shutdown mode that reduces quiescent current to 0.1µA.
The MIC2182 achieves high efficiency over a wide output current range by automatically switching between PWM and skip mode. Skip-mode operation enables the converter to maintain high efficiency at light loads by turning off circuitry pertaining to PWM operation, reducing the no-load supply current from 1.6mA to 600µA. The operating mode of MIC2182 is internally selected according to the output load conditions. Skip mode can be defeated by pulling the PWM pin low which reduces noise and RF interference.
The MIC2182 is available in a 16-pin SOP (small-outline package) and SSOP (shrink small-outline package) with an operating range from 40°C to +85°C.
Micrel's MIC2182 is a synchronous buck (step-down) switching regulator controller. An all N-channel synchronous architecture and powerful output drivers allow up to a 20A output current capabilty. The PWM and skip-mode control scheme of MIC2182 allows efficiency to exceed 95% over a wide range of load current, making it ideal for battery powered applications, as well as high current distributed power supplies.
The MIC2182 operates from a 4.5V to 32V input and can operate with a maximum duty cycle of 86% for use in lowdropout conditions. It also features a shutdown mode that reduces quiescent current to 0.1A.
The MIC2182 achieves high efficiency over a wide output current range by automatically switching between PWM and
skip mode. Skip-mode operation of MIC2182 enables the converter to maintain high efficiency at light loads by turning off circuitry pertaining to PWM operation, reducing the no-load supply current from 1.6mA to 600A. The operating mode is internally selected according to the output load conditions. Skip mode can be defeated by pulling the PWM pin low which reduces noise and RF interference.
The MIC2182 is available in a 16-pin SOP (small-outline package) and SSOP (shrink small-outline package) with an operating range from 40°C to +85°C.
MIC2182 Data Sheet
