Rainbow Electronics MAX833 - Manual

_______________General Description
The MAX830/MAX831/MAX832/MAX833 are monolithic,
bipolar, pulse-width-modulation (PWM), switch-mode, step-
down DC-DC regulators. Each is rated at 1A. Very few
external components are needed for standard operation
because the power switch, oscillator, feedback, and control
circuitry are all on-chip. Employing a classic buck topology,
these regulators perform high-current step-down functions.
These regulators have excellent dynamic and transient
response characteristics, while featuring cycle-by-cycle cur-
rent limiting to protect against overcurrent faults and short-
circuit output faults. They have a wide 8V to 30V input
range. Outputs for the MAX831/MAX832/MAX833 are fixed
at 5V/3.3V/3V, respectively. The MAX830 output is
adjustable.
Available in 16-pin SO packages, the MAX830–MAX833
have a preset 100kHz oscillator frequency. In addition,
the preset current limit and micropower shutdown can be
externally controlled. See the MAX724/MAX726 data
sheet for more applications information.
_______________________Applications
Distributed Power from High-Voltage Buses
High-Current, High-Voltage Step-Down Applications
Multiple-Output Buck Converter
MAX830–MAX833
5V/3.3V/3V/Adjustable-Output, 1A,
Step-Down, PWM, Switch-Mode DC-DC Regulators
________________________________________________________________ Maxim Integrated Products 1
TOP VIEW
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
V SW
V SW
V SW
V SW
V IN
V IN
V IN
V IN
MAX830
MAX831
MAX832
MAX833
GND
V C
GND
SHUT (FB) SENSE
GND
I LIM
GND
Wide SO
T j (MAX) = +125°C, θ
jA = +55°C/W*
( ) ARE FOR MAX830
* THIS THERMAL RESISTANCE NUMBER IS WITH THE DEVICE WELL MOUNTED
ON 1 oz. COPPER WITH THERMAL PASTE BETWEEN THE IC AND THE
UNDERLYING GROUND PLANE. LOWER THERMAL RESISTANCE IS POSSIBLE
(SEE APPLICATIONS SECTION).
__________________Pin Configuration
VIN
VC
VSW
100 µ F
GND
10k
0.047 µ F
OUTPUT
5V AT 1A
SENSE
100 µ H*
MBR350
470 µ F
INPUT
8V TO 30V
MAX831
STEP-DOWN CONVERTER
* CoilCraft DO3316-104
__________Typical Operating Circuit
Call toll free 1-800-998-8800 for free samples or literature.
19-0167; Rev 2; 6/95
___________________________Features
♦ Input Range: Up to 30V
♦ 1A On-Chip Power Switch
♦ Adjustable Output (MAX830)
Fixed Outputs: 5V (MAX831)
3.3V (MAX832)
3V (MAX833)
♦ 100kHz Switching Frequency
♦ Excellent Dynamic Characteristics
♦ Few External Components
♦ 8mA Quiescent Current
♦ 16-Pin SO Package
♦ Evaluation Kit Available
______________Ordering Information
PART TEMP. RANGE PIN-PACKAGE
MAX830CWE 0°C to +70°C 16 Wide SO
MAX832CWE 0°C to +70°C 16 Wide SO
MAX831CWE 0°C to +70°C 16 Wide SO
MAX833CWE 0°C to +70°C 16 Wide SO
EVALUATION KIT MANUAL
FOLLOWS DATA SHEET