MAX799 MAXIM [Maxim Integrated Products], MAX799 Datasheet
MAX799
Manufacturer Part Number
MAX799
Description
Step-Down Controllers with Synchronous Rectifier for CPU Power
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet
1.MAX799.pdf
(32 pages)
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MAX799CSE
Manufacturer:
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877
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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
19-0221; Rev 4; 9/05
Idle Mode is a trademark of Maxim Integrated Products.
†
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
U.S. and foreign patents pending.
_______________General Description
MAX796
MAX797
MAX799
PART
Notebook and Subnotebook Computers
PDAs and Mobile Communicators
Cellular Phones
MAIN OUTPUT
3.3V/5V or adj
3.3V/5V or adj
3.3V/5V or adj
________________________________________________________________ Maxim Integrated Products
Synchronous Rectifier for CPU Power
Regulates positive secondary
voltage (such as +12V)
Logic-controlled low-noise mode
Regulates negative secondary
voltage (such as -5V)
SPECIAL FEATURE
Step-Down Controllers with
____________________________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 (V
♦ 1μA Typ Shutdown Current
_______________Ordering Information
___________________Pin Configuration
Ordering Information continued at end of data sheet.
*Contact factory for dice specifications.
TOP VIEW
MAX796CPE
MAX796CSE
MAX796C/D
MAX796EPE
MAX796ESE
MAX796MJE
( ) ARE FOR MAX796/ MAX799.
PART
(SECFB) SKIP
†
SHDN
SYNC
GND
CSH
REF
SS
FB
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
1
2
3
4
5
6
7
8
TEMP RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
MAX796
MAX797
MAX799
DIP/SO
IN
16
15
14
13
12
11
10
= 12V, V
9
16 Plastic DIP
16 Narrow SO
Dice*
16 Plastic DIP
16 Narrow SO
16 CERDIP
PIN-PACKAGE
DH
LX
BST
VL
V+
CSL
DL
PGND
OUT
= 5V)
1
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