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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1793 Datasheet

Low-Dropout / Low IQ / 1A Linear Regulator

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MAX1793 pdf
19-1654; Rev 1; 11/00
Low-Dropout, Low IQ, 1A Linear Regulator
General Description
The MAX1793 low-dropout linear regulator (LDO) oper-
ates from +2.5V to +5.5V and delivers a guaranteed 1A
load current with a low 210mV dropout. The high-accu-
racy (±1%) output voltage is preset at an internally
trimmed voltage (see Ordering Information) or can be
adjusted from 1.25V to 5.0V with an external resistor-
divider.
An internal PMOS pass transistor allows a low 125µA
supply current, making the MAX1793 ideal for battery-
operated portable equipment. Other features include a
built-in reset output, low-power shutdown, and short-cir-
cuit and thermal overload protection. The MAX1793 is
available in a 1.5W, 16-pin power TSSOP package,
which is 30% smaller than a SOT223 package and only
1.1mm high.
________________________Applications
Notebook Computers
Cordless Telephones
Cellular Phones
Modems
Hand-Held Instruments
PDAs and Palmtop Computers
Features
o Guaranteed 1A Output Current
o Low 210mV Dropout at 1A
o Up to ±1% Output Voltage Accuracy
Preset at 1.5V, 1.8V, 2.0V, 2.5V, 3.3V or 5.0V
Adjustable from 1.25V to 5.0V
o Reset Output (4ms delay)
o Low 125µA Ground Current
o 0.1µA Shutdown
o Low 115µVRMS Output Noise
o Thermal Overload Protection
o Output Current Limit
o Tiny TSSOP Power Package (1.5W)
30% Smaller than SOT223 (only 1.1mm high)
Ordering Information
PART
TEMP.
RANGE
PIN-
PACKAGE
VOUT (V)
MAX1793EUE-50 -40°C to +85°C 16 TSSOP-EP* 5.0 or Adj
MAX1793EUE-33 -40°C to +85°C 16 TSSOP-EP* 3.3 or Adj
MAX1793EUE-25 -40°C to +85°C 16 TSSOP-EP 2.5 or Adj
MAX1793EUE-20 -40°C to +85°C 16 TSSOP-EP 2.0 or Adj
MAX1793EUE-18 -40°C to +85°C 16 TSSOP-EP 1.8 or Adj
MAX1793EUE-15 -40°C to +85°C 16 TSSOP-EP 1.5 or Adj
*EP = Exposed Pad
Contact factory for other preset output voltages.
Typical Operating Circuit
IN
CIN
ON
OFF
NINC OUT
IN MAX1793 OUT
IN OUT
IN OUT
SHDN
RST
SET
GND
OUT
COUT
RESET
OUTPUT
Pin Configuration
TOP VIEW
N.C. 1
IN 2
IN 3
IN 4
IN 5
RST 6
SHDN 7
N.C. 8
MAX1793
16 N.C.
15 OUT
14 OUT
13 OUT
12 OUT
11 SET
10 GND
9 N.C.
TSSOP-EP
________________________________________________________________ Maxim Integrated Products 1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1793 Datasheet

Low-Dropout / Low IQ / 1A Linear Regulator

No Preview Available !

MAX1793 pdf
Low-Dropout, Low IQ, 1A Linear Regulator
ABSOLUTE MAXIMUM RATINGS
IN, SHDN, RST to GND ............................................-0.3V to +6V
OUT, SET to GND ........................................-0.3V to (VIN + 0.3V)
Output Short-Circuit Duration ............................................Infinite
Continuous Power Dissipation (TA = +70°C)
16-Pin TSSOP-EP (derate 19mW/°C above +70°C)........1.5W
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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 = VOUT(NOM) + 0.5V or VIN = 2.5V (whichever is greater), SHDN = IN, TA = +0°C to +85°C, unless otherwise noted. Typical values
are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Input Voltage
VIN
2.5 5.5 V
Input Undervoltage Lockout
Output Voltage Accuracy
(preset mode, SET = GND)
VIN 2.0
TA = +85°C,
IOUT = 250mA
Preset VOUT 2.5V
Preset VOUT < 2.5V
-1
-1.5
TA = 0°C to +85°C, IOUT = 250mA
-2
TA = 0°C to +85°C, IOUT = 1mA to 1A,
VIN > VOUT + 0.5V
-3
2.3
1
+1.5
2
3
V
%
SET Voltage Threshold
(for adjustable output)
TA = +85°C, IOUT = 250mA, VIN = 3V
TA = 0°C to +85°C, IOUT = 250mA, VIN = 3V
TA = 0°C to +85°C, IOUT = 1mA to 1A, VIN = 3V
1.229
1.219
1.212
1.250
1.271
1.281
1.288
V
Adjustable Output Voltage
Range
1.25 5 V
Maximum Output Current
Short-Circuit Current Limit
In-Regulation Current Limit
SET Pin Dual Mode Threshold
SET Input Bias Current
Ground Current
Dropout Voltage (Note 1)
IOUT
ILIM
Continuous, VIN = 3V
VOUT = 0, VIN = 3V
VOUT within 4% of nominal output voltage,
VIN = 5.5V
ISET
IGND
VIN - VOUT
VSET = +1.25V
IOUT = 100µA
IOUT = 1A,
SET = GND
MAX1793-33, -50
MAX1793-25
1 ARMS
1.1 1.8 3.3
A
2.8 A
50 150 mV
±100
nA
125 200
µA
210 350
270 450
mV
Line Regulation
Load Regulation
Output Voltage Noise
Shutdown Supply Current
VLNR
VLDR
IOFF
VIN from (VOUT + 0.1V) to +5.5V,
IOUT = 5mA, SET = GND
IOUT = 100µA to 1A
10Hz to 1MHz, COUT = 6.8µF (ESR < 0.1)
SHDN = GND, VIN = +5.5V
-0.15
0
0.7
115
0.1
0.15
16
%/V
%
µVRMS
µA
Output Pulldown Resistance in
Shutdown
SHDN = GND
5 k
SHDN Input Threshold
SHDN Input Bias Current
VIH
VIL
ISHDN
+2.5V < VIN < +5.5V
SHDN = GND or IN
1.6
0.6
0.01 1
V
µA
2 _______________________________________________________________________________________


Part Number MAX1793
Description Low-Dropout / Low IQ / 1A Linear Regulator
Maker Maxim
Total Page 10 Pages
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