MAX798ESE+ Maxim Integrated Products, MAX798ESE+ Datasheet

IC CNTRLR STEP DOWN 16-SOIC

MAX798ESE+

Manufacturer Part Number
MAX798ESE+
Description
IC CNTRLR STEP DOWN 16-SOIC
Manufacturer
Maxim Integrated Products
Type
Step-Down (Buck)r
Datasheet

Specifications of MAX798ESE+

Internal Switch(s)
No
Synchronous Rectifier
Yes
Number Of Outputs
1
Voltage - Output
1.6 ~ 6 V
Current - Output
10A
Frequency - Switching
150kHz, 300kHz
Voltage - Input
4.5 ~ 30 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
16-SOIC (3.9mm Width)
Power - Output
696mW
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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
_______________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

Related parts for MAX798ESE+

MAX798ESE+ Summary of contents

Page 1

... SYNC 6 SHDN FB 7 CSH 8 SO Idle Mode is a trademark of Maxim Integrated Products. † U ________________________________________________________________ Maxim Integrated Products For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 ____________________________Features 96% Efficiency 4.5V to 30V Input Range 1. Adjustable Precision Output ±0.4% Max Total Load-Regulation Error ...

Page 2

High-Accuracy Step-Down Controller with Synchronous Rectifier for CPU Power ABSOLUTE MAXIMUM RATINGS V+ to GND .................................................................-0.3V, +36V GND to PGND........................................................................± GND ...................................................................-0.3V, +7V BST to GND ...............................................................-0.3V, +36V ........................................................-0.3V, (BST + 0.3V BST.....................................................................-7V, ...

Page 3

High-Accuracy Step-Down Controller with Synchronous Rectifier for CPU Power ELECTRICAL CHARACTERISTICS (continued) (V+ = +15V, GND = PGND = 0V PARAMETER SYNC = REF Oscillator Frequency SYNC = SYNC High Pulse Width SYNC ...

Page 4

High-Accuracy Step-Down Controller with Synchronous Rectifier for CPU Power ELECTRICAL CHARACTERISTICS (V+ = +15V, GND = PGND = 0V REF PARAMETER STEP-DOWN CONTROLLER Input Supply Range Nominal Adjustable Output External resistor divider Voltage Range Feedback Voltage ...

Page 5

High-Accuracy Step-Down Controller with Synchronous Rectifier for CPU Power ______________________________________________________________Pin Description PIN NAME 1 SS Soft-Start Timing Capacitor Connection. Ramp time to full current limit is approximately 1ms/nF. Disables pulse-skipping mode when high. Connect to GND for normal use. Don’t ...

Page 6

High-Accuracy Step-Down Controller with Synchronous Rectifier for CPU Power V , 4.5V TO 30V 2 SKIP 0.33 F REF ON SHDN OFF MAX798 0. SYNC Q1 SILICONIX Si4410DY or IRF7413 C1, ...

Page 7

High-Accuracy Step-Down Controller with Synchronous Rectifier for CPU Power The MAX798 contains the following seven major circuit blocks, which are shown in Figure 2. PWM Controller Blocks: Multi-Input PWM Comparator Current-Sense Circuit PWM Logic Block Gate-Driver Outputs BATTERY VOLTAGE 4.5V ...

Page 8

High-Accuracy Step-Down Controller with Synchronous Rectifier for CPU Power These internal IC blocks aren’t powered directly from the battery. Instead, a +5V linear regulator steps down the battery voltage to supply both the IC internal rail (VL pin) as well ...

Page 9

High-Accuracy Step-Down Controller with Synchronous Rectifier for CPU Power 1.6V SLOPE COMP 30mV SKIP SHDN –100mV Figure 3. PWM Controller Detailed Block Diagram _______________________________________________________________________________________ MAIN PWM COMPARATOR VL CURRENT LIMIT 24R 2.5V 1R SYNCHRONOUS RECTIFIER CONTROL ...

Page 10

High-Accuracy Step-Down Controller with Synchronous Rectifier for CPU Power 5V ±10% V BATT 0.1µ MAX798 DH DL Figure 4. Powering VL from a Separate +5V Supply 10 ______________________________________________________________________________________ DH MAX798 DL CSH CSL FB GND V OUT (V ...

Page 11

High-Accuracy Step-Down Controller with Synchronous Rectifier for CPU Power ___________________Chip Information TRANSISTOR COUNT: 1008 ________________________________________________________Package Information ______________________________________________________________________________________ 0.101mm 0.004in Narrow SO SMALL-OUTLINE H PACKAGE (0.150 in.) INCHES MILLIMETERS DIM MIN MAX MIN ...

Page 12

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 12 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 1996 Maxim Integrated Products ...

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