DC-DC Regulators. MAX830 Datasheet

MAX830 Datasheet PDF, Equivalent


Part Number

MAX830

Description

Switch-Mode DC-DC Regulators

Manufacture

Maxim

Total Page 5 Pages
PDF Download
Download MAX830 Datasheet


MAX830 Datasheet
19-0167; Rev 2; 6/95
EVFAOLLULAOTWIOSNDKAITTAMSAHNEUEATL
5V/3.3V/3V/Adjustable-Output, 1A,
Step-Down, PWM, Switch-Mode DC-DC Regulators
_______________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
___________________________Features
o Input Range: Up to 30V
o 1A On-Chip Power Switch
o Adjustable Output (MAX830)
Fixed Outputs: 5V (MAX831)
3.3V (MAX832)
3V (MAX833)
o 100kHz Switching Frequency
o Excellent Dynamic Characteristics
o Few External Components
o 8mA Quiescent Current
o 16-Pin SO Package
o Evaluation Kit Available
______________Ordering Information
PART
MAX830CWE
MAX831CWE
MAX832CWE
MAX833CWE
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
16 Wide SO
16 Wide SO
16 Wide SO
16 Wide SO
__________Typical Operating Circuit __________________Pin Configuration
INPUT
8V TO 30V
100µF
VIN VSW
MAX831
VC SENSE
10k
GND
0.047µF
100µH*
OUTPUT
5V AT 1A
MBR350
470µF
STEP-DOWN CONVERTER
* CoilCraft DO3316-104
TOP VIEW
VIN 1
VIN 2
VIN 3
VIN 4
GND 5
ILIM 6
GND 7
(FB) SENSE 8
MAX830
MAX831
MAX832
MAX833
16 VSW
15 VSW
14 VSW
13 VSW
12 GND
11 VC
10 GND
9 SHUT
Wide SO
Tj (MAX) = +125°C, θjA = +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).
________________________________________________________________ Maxim Integrated Products 1
Call toll free 1-800-998-8800 for free samples or literature.

MAX830 Datasheet
5V/3.3V/3V/Adjustable-Output, 1A,
Step-Down, PWM, Switch-Mode DC-DC Regulators
ABSOLUTE MAXIMUM RATINGS
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V
Switch Voltage with Respect to Input Voltage. . . . . . . . . . . . . . . . 50V
Switch Voltage with Respect to GND
(VSW negative) (Note 1). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20V
FB/SENSE Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V, +10V
SHUT Voltage (not to exceed VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30V
ILIM Voltage (forced). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5V
Operating Temperature Range. . . . . . . . . . . . . . . . . . . . . 0°C to +70°C
Junction Temperature Range . . . . . . . . . . . . . . . . . . . . . 0°C to +125°C
Storage Temperature Range . . . . . . . . . . . . . . . . . . . -65°C to +160°C
Lead Temperature (soldering, 10sec). . . . . . . . . . . . . . . . . . . . +300°C
Note 1: Do not exceed switch-to-input voltage limitation.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VIN = 25V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
Input Supply Voltage Range
Switch-On Voltage (Note 2)
Switch-Off Leakage
Supply Current (Note 3)
CONDITIONS
ISW = 0.2A
ISW = 1A
VIN = 25V, VSW = 0V
VIN = 30V, VSW = 0V
TA = +25°C
VIN 30V, VSENSE = 5.5V (MAX831/MAX832/
MAX833) or VFB = 2.5V (MAX830)
VSHUT = 0.1V (Note 4)
MIN
8
Minimum Supply Voltage (Note 5)
Switch-Current Limit (Note 6)
Maximum Duty Cycle
Switching Frequency
Switching-Frequency Line Regulation
Error-Amplifier Voltage Gain
Error-Amplifier Transconductance
Error-Amplifier Source Current
Error-Amplifier Sink Current
Normal mode
Startup mode
ILIM open
RLIM = 10k(Note 7)
RLIM = 7k(Note 7)
TA = +25°C
TA = +25°C
VFB or VSENSE = 0V (Note 6)
8V VIN 30V
1V VC 4V
VFB = 2.0V (MAX830) or
VSENSE = 2.0V
(MAX831/832/833)
VFB = 2.5V (MAX830) or
VSENSE = 5.5V
(MAX831/832/833)
TA = +25°C
TA = +25°C
TA = +25°C
TA = +25°C
TA = +25°C
1.2
85
90
85
3000
100
0.6
TYP
8
140
7.3
3.5
1.7
1.2
0.8
90
100
20
0.03
2000
5000
140
1.0
MAX
30
1.1
1.4
150
250
11
UNITS
V
V
µA
mA
500 µA
8.0
V
4.8
2.2
A
%
110
120 kHz
0.10
9000
225
%/V
V/V
µmho
µA
1.7 mA
2 _______________________________________________________________________________________


Features Datasheet pdf 19-0167; Rev 2; 6/95 5V/3.3V/3V/Adjusta ble-Output, 1A, Step-Down, PWM, Switch- Mode DC-DC Regulators _______________Ge neral Description The MAX830/MAX831/MAX 832/MAX833 are monolithic, bipolar, pul se-width-modulation (PWM), switch-mode, stepdown DC-DC regulators. Each is rat ed at 1A. Very few external components are needed for standard operation becau se the power switch, oscillator, feedba ck, and control circuitry are all on-ch ip. Employing a classic buck topology, these regulators perform high-current s tep-down functions. These regulators ha ve excellent dynamic and transient resp onse characteristics, while featuring c ycle-by-cycle current limiting to prote ct 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 pr eset 100kHz oscillator frequency. In addition, the preset current.
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