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MAX796 Dataheets PDF



Part Number MAX796
Manufacturers Maxim
Logo Maxim
Description Step-Down Controllers with Synchronous Rectifier for CPU Power
Datasheet MAX796 DatasheetMAX796 Datasheet (PDF)

19-0221; Rev 3a; 11/97 UALS IT MAN TION K A ET U E L H A S A EV W DAT FOLLO Step-Down Controllers with Synchronous Rectifier for CPU Power ____________________________Features o 96% Efficiency o 4.5V to 30V Input Range o 2.5V to 6V Adjustable Output o o o o o o o o o Preset 3.3V and 5V Outputs (at up to 10A) Multiple Regulated Outputs +5V Linear-Regulator Output Precision 2.505V Reference Output Automatic Bootstrap Circuit 150kHz/300kHz Fixed-Frequency PWM Operation Programmable Soft-Start 375.

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19-0221; Rev 3a; 11/97 UALS IT MAN TION K A ET U E L H A S A EV W DAT FOLLO Step-Down Controllers with Synchronous Rectifier for CPU Power ____________________________Features o 96% Efficiency o 4.5V to 30V Input Range o 2.5V to 6V Adjustable Output o o o o o o o o o Preset 3.3V and 5V Outputs (at up to 10A) Multiple Regulated Outputs +5V Linear-Regulator Output Precision 2.505V Reference Output Automatic Bootstrap Circuit 150kHz/300kHz Fixed-Frequency PWM Operation Programmable Soft-Start 375µA Typ Quiescent Current (VIN = 12V, VOUT = 5V) 1µA Typ Shutdown Current _______________General Description The MAX796/MAX797/MAX799 high-performance, stepdown 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 secondary feedback input (SECFB) for transformer-based dual-output applications. This secondary feedback path improves cross-regulation of positive (MAX796) or negative (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 sensitive 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 16pin DIP and narrow SO packages. See the table below to compare these three converters. PART MAX796 MAX797 MAX799 MAIN OUTPUT 3.3V/5V or adj. 3.3V/5V or adj. 3.3V/5V or adj. SPECIAL FEATURE Regulates positive secondary voltage (such as +12V) Logic-controlled low-noise mode Regulates negative secondary voltage (such as -5V) MAX796/MAX797/MAX799 ______________Ordering Information PART† MAX796CPE MAX796CSE MAX796C/D MAX796EPE MAX796ESE MAX796MJE TEMP. RANGE 0°C to +70°C 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C -55°C to +125°C PIN-PACKAGE 16 Plastic DIP 16 Narrow SO Dice* 16 Plastic DIP 16 Narrow SO 16 CERDIP Ordering Information continued at end of data sheet. *Contact factory for dice specifications. __________________Pin Configuration TOP VIEW SS 1 16 DH 15 LX 14 BST ________________________Applications Notebook and Subnotebook Computers PDAs and Mobile Communicators Cellular Phones (SECFB) SKIP 2 REF 3 GND 4 SYNC 5 SHDN 6 FB 7 CSH 8 MAX796 MAX797 MAX799 13 DL 12 PGND 11 VL 10 V+ 9 CSL Idle Mode is a trademark of Maxim Integrated Products. †U.S. and foreign patents pending. DIP/SO ( ) ARE FOR MAX796/ MAX799. ________________________________________________________________ Maxim Integrated Products 1 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. Step-Down Controllers with Synchronous Rectifier for CPU Power MAX796/MAX797/MAX799 ABSOLUTE MAXIMUM RATINGS V+ to GND .................................................................-0.3V, +36V GND to PGND........................................................................±2V VL to GND ...................................................................-0.3V, +7V BST to GND ...............................................................-0.3V, +36V DH to LX...........................................................-0.3V, BST + 0.3V LX to BST.....................................................................-7V, +0.3V SHDN to GND............................................................-0.3V, +36V SYNC, SS, REF, FB, SECFB, SKIP, DL to GND..-0.3V, VL + 0.3V CSH, CSL to GND .......................................................-0.3V, +7V VL Short Circuit to GND..............................................Momentary REF Short Circuit to GND ...........................................Continuous VL Output Current ...............................................................50mA Continuous Power Dissipation (TA = +70°C) SO (derate 8.70mW/°C above +70°C) ........................696mW Plastic DIP (derate 10.53mW/°C above +70°C) .........842mW CERDIP (derate 10.00mW/°C above +70°C) ..............800mW Operating Temperature Ranges MAX79_C_ _ ......................................................0°C to +70°C MAX79_E_ _....................................................-40°C to +85°C MAX79_MJE .................................................-55°C to +125°C Storage Temperature Range .............................-65°C to +160°C Lea.


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