MAX798 Maxim, MAX798 Datasheet
MAX798
Manufacturer Part Number
MAX798
Description
High-Accuracy Step-Down Controller with Synchronous Rectifier for CPU Power
Manufacturer
Maxim
Datasheet
1.MAX798.pdf
(12 pages)
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The MAX798
converter provides main CPU power in battery-powered
systems. This buck controller achieves 96% efficiency
by using synchronous rectification and Maxim’s propri-
etary Idle Mode™ control scheme to extend battery life
at full-load (up to 10A) and no-load outputs. The
MAX798’s high accuracy meets the demanding require-
ments of the latest-generation CPUs. 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 crow-
bar switching currents found in some PMOS/NMOS switch
designs.
The MAX798 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.
________________________Applications
19-1175; Rev 0; 12/96
Idle Mode is a trademark of Maxim Integrated Products.
†
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
U.S. and foreign patents pending.
_______________General Description
__________________Pin Configuration
TOP VIEW
Notebook and Subnotebook Computers
PDAs and Mobile Communicators
with Synchronous Rectifier for CPU Power
SYNC
SHDN
†
SKIP
GND
CSH
REF
high-performance, step-down DC-DC
SS
FB
________________________________________________________________ Maxim Integrated Products
1
2
3
4
5
6
7
8
MAX798
SO
High-Accuracy Step-Down Controller
16
15
14
13
12
11
10
9
DH
LX
BST
DL
PGND
VL
V+
CSL
____________________________Features
__________Typical Operating Circuit
ON
______________Ordering Information
MAX798ESE
96% Efficiency
4.5V to 30V Input Range
1.6V to 6V Adjustable Precision Output
±0.4% Max Total Load-Regulation Error
0.06%/V Max Line-Regulation Error
5V Linear-Regulator Output
Precision 2.505V Reference Output
Automatic Bootstrap Circuit
150kHz/300kHz Fixed-Frequency PWM Operation
Programmable Soft-Start
1.2mA Typical Quiescent Current
(V
1µA Typical Shutdown Current
4.5V TO 30V
IN
INPUT
OFF
PART
= 12V, V
SHDN
MAX798
GND
V+
OUT
PGND
VL
CSH
CSL
BST
DH
DL
LX
FB
TEMP. RANGE
-40°C to +85°C
= 2.5V)
0.1 F
N
N
4.7 F
5V, 25mA
16 Narrow SO
PIN-PACKAGE
R
SENSE
V
OUT
1
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