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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1830 Datasheet

Step-Down Regulators

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MAX1830 pdf
19-2198; Rev 0; 10/01
EVALUATION KIT
AVAILABLE
3A, 1MHz, Low-Voltage, Step-Down Regulators with
Synchronous Rectification and Internal Switches
General Description
The MAX1830/MAX1831 constant-off-time, pulse-width-
modulated (PWM) step-down DC-DC converters are
ideal for use in 5V and 3.3V to low-voltage conversion
necessary in notebook and subnotebook computers.
These devices feature internal synchronous rectification
for high efficiency and reduced component count. They
require no external Schottky diode. The internal 45m
PMOS power switch and 55mNMOS synchronous-rec-
tifier switch easily deliver continuous load currents up to
3A. The MAX1830 produces preset +2.5V, +1.8V, or
+1.5V output voltage or an adjustable output from +1.1V
to VIN. The MAX1831 produces preset +3.3V, +2.5V, and
+1.5V output voltages and an adjustable output from
+1.1V to VIN. They achieve efficiencies as high as 94%.
The MAX1830/MAX1831 use a unique current-mode,
constant-off-time, PWM control scheme, which includes
Idle Mode™ to maintain high efficiency during light-
load operation. The programmable constant-off-time
architecture sets switching frequencies up to 1MHz,
allowing the user to optimize performance trade-
offs between efficiency, output switching noise, compo-
nent size, and cost. Both devices are designed for con-
tinuous output currents up to 3A, an internal digital
soft-start to limit surge currents during startup, a 100%
duty cycle mode for low-dropout operation, and a
low-power shutdown mode that disconnects the input
from the output and reduces supply current below
1µA.The MAX1830/MAX1831 are available in 16-pin
QSOP packages.
For similar devices that provide continuous output
currents of 1A to 3A, refer to the MAX1644, MAX1623,
and MAX1742/MAX1842/MAX1843 data sheets.
Applications
5V or 3.3V to Low-Voltage Conversion
CPU I/O Supplies
Chipset Supplies
Notebook and Subnotebook Computers
Pin Configuration appears at end of data sheet.
Features
o ±1.5% Output Accuracy
o 94% Efficiency
o Internal PMOS/NMOS Switches
45m/55mOn-Resistance at VIN = +4.5V
50m/55mOn-Resistance at VIN = +3V
o Output Voltages
+3.3V, +2.5V, or +1.5V Pin Selectable (MAX1831)
+2.5V, +1.8V, or +1.5V Pin Selectable (MAX1830)
+1.1V to VIN Adjustable (Both Devices)
o +3V to +5.5V Input Voltage Range
o 750µA (max) Operating Supply Current
o <1µA Shutdown Supply Current
o Programmable Constant-Off-Time Operation
o Up to 1MHz Switching Frequency
o Idle Mode Operation at Light Loads
o Thermal Shutdown
o Internal Digital Soft-Start Inrush Current Limiting
o 100% Duty Cycle During Low-Dropout Operation
o Output Short-Circuit Protection
o 16-Pin QSOP Package
PART
MAX1830EEE
MAX1831EEE
Ordering Information
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 QSOP
16 QSOP
Typical Configuration
INPUT
+3V TO
+5.5V
IN LX
MAX1830 FB
MAX1831
VCC PGND
SHDN
COMP
TOFF
GND
FBSEL
REF
OUTPUT
+1.1V TO
VIN
Idle Mode is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1830 Datasheet

Step-Down Regulators

No Preview Available !

MAX1830 pdf
3A, 1MHz, Low-Voltage, Step-Down Regulators with
Synchronous Rectification and Internal Switches
ABSOLUTE MAXIMUM RATINGS
VCC, IN, SHDN to GND ............................................-0.3V to +6V
IN to VCC.............................................................................±0.3V
GND to PGND.....................................................................±0.3V
COMP, FB, TOFF, FBSEL, REF to GND .....-0.3V to (VCC + 0.3V)
LX Current (Note 1) ...............................................................5.1A
REF Short Circuit to GND Duration ............................Continuous
ESD Protection .....................................................................±2kV
Continuous Power Dissipation (TA = +70°C)
16-Pin QSOP (derate 14mW/°C above +70°C;
part mounted on 1in2 of 1oz copper) .............................1.12W
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature ......................................................+150°C
Lead Temperature (soldering, 10s) ................................ +300°C
Note 1: LX has internal clamp diodes to PGND and IN. Applications that forward bias the diode should take care not to exceed the ICs
package power dissipation.
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 = VCC = +3.3V, FBSEL = GND, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
Input Voltage
Preset Output Voltage
SYMBOL
CONDITIONS
VIN, VCC
FBSEL = VCC
VOUT
VIN = +3V to +5.5V,
ILOAD = 0 to 3A,
VFB = VOUT
FBSEL =
unconnected
FBSEL = REF
(MAX1830)
FBSEL = GND
VIN = +3.7V to +5.5V,
ILOAD = 0 to 3A,
VFB = VOUT
FBSEL = REF
(MAX1831)
Adjustable Output Voltage Range
AC Load Regulation Error
DC Load Regulation Error
Dropout Voltage
Reference Voltage
Reference Load Regulation
Current-Limit Threshold
Maximum Output RMS Current
Idle Mode Current Threshold
PMOS Switch On-Resistance
NMOS Switch On-Resistance
Switching Frequency
No-Load Supply Current
VCC = VIN = +3V to +5.5V, ILOAD = 0,
FBSEL = GND
VDO
VREF
VREF
ILIMIT
IOUT(RMS)
IIM
VCC = VIN = +3V, ILOAD = 3A
IREF = -1µA to +10µA
(Note 4)
RON, P ILX = 0.5A
RON, N ILX = 0.5A
f (Note 2)
IIN + ICC VFB = 1.2V
VIN = 4.5V
VIN = 3V
VIN = 4.5V
VIN = 3V
MIN
3.0
2.487
TYP
2.525
MAX
5.5
2.563
UNITS
V
1.492 1.515 1.538
1.791 1.818 1.845
1.084 1.100 1.117
V
3.283 3.333 3.383
VREF
1.089
4.0
0.2
2
0.4
150
1.100
0.5
4.8
0.6
45
50
55
55
325
VIN
330
1.111
2
5.4
3.4
1.0
90
110
95
100
1
750
V
%
%
mV
V
mV
A
A
A
m
MHz
µA
2 _______________________________________________________________________________________


Part Number MAX1830
Description Step-Down Regulators
Maker Maxim
Total Page 13 Pages
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