MAX797HESE+ Maxim Integrated Products, MAX797HESE+ Datasheet

IC CTRLR SYNC STEPDOWN 16-SOIC

MAX797HESE+

Manufacturer Part Number
MAX797HESE+
Description
IC CTRLR SYNC STEPDOWN 16-SOIC
Manufacturer
Maxim Integrated Products
Type
Step-Down (Buck)r
Datasheets
1.MAX797HESE.pdf (8 pages)
2.MAX797CSE.pdf (32 pages)

Specifications of MAX797HESE+

Internal Switch(s)
No
Synchronous Rectifier
Yes
Number Of Outputs
1
Voltage - Output
3.3V, 5V, Adj
Current - Output
10A
Frequency - Switching
150kHz, 300kHz
Voltage - Input
4.5 ~ 40 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
16-SOIC (3.9mm Width)
Power - Output
696mW
Output Voltage
5 V
Output Current
10 A
Input Voltage
4.5 V
Supply Current
0.44 mA
Switching Frequency
340 KHz
Mounting Style
SMD/SMT
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX797H high-performance, step-down DC-DC
converter provides main CPU power in battery-powered
systems. A 40V rating on the power stage’s input allows
operation with high-cell-count batteries and a wide
range of AC adaptors. This buck controller achieves
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 tran-
sients 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 MAX797H 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 MAX797H is pin compatible with the popu-
lar MAX797, but has a higher input voltage range.
The MAX797H comes in a 16-pin narrow SO package.
________________________Applications
19-1239; Rev 0; 7/97
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
For small orders, phone 408-737-7600 ext. 3468.
_______________General Description
__________________Pin Configuration
TOP VIEW
Notebook and Subnotebook Computers
Industrial Controls
SHDN
SYNC
SKIP
GND
CSH
REF
SS
FB
________________________________________________________________ Maxim Integrated Products
High-Voltage, Step-Down Controller with
1
5
6
7
8
2
3
4
MAX797H
Synchronous Rectifier for CPU Power
SO
16
15
14
13
12
11
10
9
DH
LX
BST
DL
PGND
VL
V+
CSL
____________________________Features
†
__________Typical Operating Circuit
U
______________Ordering Information
MAX797HESE
+4.5V TO +30V
96% Efficiency
Up to 40V Power Input
2.5V to 6V Adjustable Output
Preset 3.3V and 5V Outputs (at up to 10A)
5V Linear-Regulator Output
Precision 2.505V Reference Output
Automatic Bootstrap Circuit
150kHz/300kHz Fixed-Frequency PWM Operation
Programmable Soft-Start
375µA Quiescent Current (V
1µA Shutdown Current
PART
SUPPLY
INPUT
SHDN
SS
REF
SYNC
GND
SKIP
†
V+
MAX797H
VL
FB
PGND
CSH
CSL
BST
DH
DL
LX
TEMP. RANGE
-40°C to +85°C
IN
+4V TO +40V
POWER INPUT
= 12V, V
16 Narrow SO
PIN-PACKAGE
OUT
= 5V)
OUTPUT
+3.3V
1

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MAX797HESE+ Summary of contents

Page 1

... SHDN CSH 8 SO Idle Mode is a trademark of Maxim Integrated Products. ________________________________________________________________ Maxim Integrated Products 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. ____________________________Features 96% Efficiency Up to 40V Power Input 2. Adjustable Output Preset 3.3V and 5V Outputs ( 10A) 5V Linear-Regulator Output Precision 2 ...

Page 2

High-Voltage, Step-Down Controller with Synchronous Rectifier for CPU Power ABSOLUTE MAXIMUM RATINGS V+ to GND ................................................................-0.3V to 36V GND to PGND........................................................................± GND...................................................................-0. BST to GND ..............................................................-0.3V to 46V .....................................................-0.3V to (BST + 0.3V) ...

Page 3

High-Voltage, Step-Down Controller with Synchronous Rectifier for CPU Power ELECTRICAL CHARACTERISTICS (continued) (V+ = 15V, GND = PGND = 0V REF = 0A, T PARAMETER Reference Output Voltage No external load (Note 1) Reference Fault Lockout ...

Page 4

High-Voltage, Step-Down Controller with Synchronous Rectifier for CPU Power ELECTRICAL CHARACTERISTICS (continued) (V+ = 15V, GND = PGND = 0V REF = 0A, T PARAMETER +3.3V and +5V STEP-DOWN CONTROLLERS V+ Input Supply Range High-side MOSFET ...

Page 5

... Switching Node (inductor) Connection. LX can swing 2V below ground without hazard. High-Side Gate-Drive Output. DH normally drives the main buck switch floating driver output that 16 DH swings from LX to BST, riding on the LX switching-node voltage. Dual Mode is a trademark of Maxim Integrated Products. Rail-to-Rail is a registered trademark of Nippon Motorola Ltd. _______________________________________________________________________________________ FUNCTION and V specifications) ...

Page 6

High-Voltage, Step-Down Controller with Synchronous Rectifier for CPU Power _______________Detailed Description The MAX797H is functionally identical to the MAX797. The only difference between the two devices is in the BST pin’s absolute maximum rating. The MAX797H’s rating is 46V; the ...

Page 7

High-Voltage, Step-Down Controller with Synchronous Rectifier for CPU Power Figure 1. Powering V+ and VL from a Regulated +5V supply Similarly, at 150kHz, the minimum duty factor is 0.425µs / 6.67µs = 0.064. This means that duty factor is not ...

Page 8

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product circu implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 8 ___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 1997 Maxim Integrated Products +7V TO +40V ...

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