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MAX796

Features: .96% Efficiency.4.5V to 30V Input Range.2.5V to 6V Adjustable Output.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 Sof...

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SeekIC No. : 004412181 Detail

MAX796: Features: .96% Efficiency.4.5V to 30V Input Range.2.5V to 6V Adjustable Output.Preset 3.3V and 5V Outputs (at up to 10A).Multiple Regulated Outputs.+5V Linear-Regulator Output.Precision 2.505V Refer...

MAX796 Data Sheet

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Part Number:
MAX796
Supply Ability:
5000

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Product Details

Description



Features:

. 96% Efficiency
. 4.5V to 30V Input Range
. 2.5V to 6V Adjustable Output
. 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


Application

. Notebook and Subnotebook Computers
. PDAs and Mobile Communicators
. Cellular Phones



Pinout

Connection Diagram


Specifications

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
Lead Temperature (soldering, 10sec) .....................+300°C


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 of MAX796 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 16-pin DIP and narrow SO packages. See the table below to compare these three converters.




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