MAX1793EUE25 Datasheet, PDF (6/11 Pages) Maxim Integrated Products – Low-Dropout, Low IQ, 1A Linear Regulator

Low-Dropout, Low I_Q, 1A Linear Regulator
Typical Operating Characteristics (continued)
(Circuit of Figure 2, V_IN = +5V, V _SHDN = V_IN, V_OUT = +3.3V, T_A = +25°C, unless otherwise noted.)
SHUTDOWN RESPONSE
MAX1793 toc14
V_OUT
2V/div
V_SHDN
I_OUT = 100mA
40µs/div
5V/div
RESET OUTPUT RESPONSE
MAX1793 toc15
V_IN
5V/div
V_OUT
2V/div
RST
2V/div
1ms/div
PIN
1, 8, 9, 16
2–5
6
7
10
11
12–15
—
Pin Description
NAME
N.C.
IN
RST
SHDN
GND
SET
OUT
EP
FUNCTION
No Connection. Not internally connected.
Regulator Input. Supply voltage ranges from +2.5V to +5.5V. Bypass with a 4.7µF capacitor to GND
(see the Capacitor Selection and Regulator Stability). These inputs are internally connected, but they
also must be externally connected for proper operation.
Reset Output. Open-drain output is low when V_OUT is 6% below its nominal value. RST remains low
while the output voltage (V_OUT) is below the reset threshold and for at least 4ms after V_OUT rises above
the reset threshold. Connect a 100kΩ pullup resister to OUT to obtain an output voltage.
Active-Low Shutdown Input. A logic-low disables the output and reduces the supply current to 0.1µA.
In shutdown, the RST output is low and OUT is pulled low through an internal 5kΩ resistance. Connect
SHDN to IN for normal operation.
Ground. This pin and the exposed pad also function as a heatsink. Solder both to a large pad or to the
circuit-board ground plane to maximize power dissipation.
Voltage-Setting Input. Connect to GND to select the factory-present output voltage. Connect SET to an
external resistor-divider for adjustable-output operation.
Regulator Output. Bypass with a 6.8µF, low-ESR capacitor to GND. Connect all OUT pins together at
the IC.
Exposed Pad. Connect to the ground plane. EP also functions as a heatsink. Solder to the circuit-board
ground plane to maximize thermal dissipation.
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