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MAX796CPE Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX796CPE Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 32 page _______________General Description The MAX796/MAX797/MAX799 high-performance, step- down DC-DC converters with single or dual outputs provide main CPU power in battery-powered systems. These buck controllers achieve 96% efficiency by using synchronous rectification and Maxim’s proprietary Idle Mode™ control scheme to extend battery life at full-load (up to 10A) and no-load outputs. Excellent dynamic response corrects output transients caused by the latest dynamic-clock CPUs within five 300kHz clock cycles. Unique bootstrap circuitry drives inexpensive N-channel MOSFETs, reducing system cost and eliminating the crowbar switching currents found in some PMOS/NMOS switch designs. The MAX796/MAX799 are specially equipped with a sec- ondary feedback input (SECFB) for transformer-based dual-output applications. This secondary feedback path improves cross-regulation of positive (MAX796) or nega- tive (MAX799) auxiliary outputs. The MAX797 has a logic-controlled and synchronizable fixed-frequency pulse-width-modulating (PWM) operating mode, which reduces noise and RF interference in sensi- tive mobile-communications and pen-entry applications. The SKIP override input allows automatic switchover to idle-mode operation (for high-efficiency pulse skipping) at light loads, or forces fixed-frequency mode for lowest noise at all loads. The MAX796/MAX797/MAX799 are all available in 16- pin DIP and narrow SO packages. See the table below to compare these three converters. ________________________Applications Notebook and Subnotebook Computers PDAs and Mobile Communicators Cellular Phones ____________________________Features o 96% Efficiency o 4.5V to 30V Input Range o 2.5V to 6V Adjustable Output o Preset 3.3V and 5V Outputs (at up to 10A) o Multiple Regulated Outputs o +5V Linear-Regulator Output o Precision 2.505V Reference Output o Automatic Bootstrap Circuit o 150kHz/300kHz Fixed-Frequency PWM Operation o Programmable Soft-Start o 375µA Typ Quiescent Current (VIN = 12V, VOUT = 5V) o 1µA Typ Shutdown Current Step-Down Controllers with Synchronous Rectifier for CPU Power ________________________________________________________________ Maxim Integrated Products 1 PART MAX799 MAIN OUTPUT SPECIAL FEATURE 3.3V/5V or adj. Regulates negative secondary voltage (such as -5V) MAX797 3.3V/5V or adj. Logic-controlled low-noise mode MAX796 3.3V/5V or adj. Regulates positive secondary voltage (such as +12V) Idle Mode is a trademark of Maxim Integrated Products. †U.S. and foreign patents pending. 19-0221; Rev 3a; 11/97 EVALUATION KIT MANUALS FOLLOW DATA SHEET __________________Pin Configuration 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 DH LX BST DL GND REF (SECFB) SKIP SS TOP VIEW MAX796 MAX797 MAX799 PGND VL V+ CSL ( ) ARE FOR MAX796/MAX799. CSH FB SHDN SYNC DIP/SO Dice* 16 Narrow SO 16 Plastic DIP PIN-PACKAGE TEMP. RANGE 0°C to +70°C 0°C to +70°C 0°C to +70°C MAX796C/D MAX796CSE MAX796CPE PART† 16 CERDIP 16 Narrow SO 16 Plastic DIP -40°C to +85°C -40°C to +85°C -55°C to +125°C MAX796MJE MAX796ESE MAX796EPE Ordering Information continued at end of data sheet. *Contact factory for dice specifications. ______________Ordering Information For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468. |
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