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MAX6796TPLD0+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
MAX6791–MAX6796
High-Voltage, Micropower, Single/Dual Linear
Regulators with Supervisory Functions
10 ______________________________________________________________________________________
Pin Description
Typical Operating Characteristics (continued)
(V
IN
= V
EN
= 14V, C
IN
= 0.1µF, C
OUT
= 10µF, T
J
= T
A
= +25°C, unless otherwise noted.)
LOAD-TRANSIENT RESPONSE
MAX6791-96toc22
I
OUT1
OUT1
AC-COUPLED
100mA/div
20mA
500mV/div
1ms/div
MAX6792
V
OUT1
= 5V
C
OUT
= 10µF
PIN
MAX6791/
MAX6792
MAX6793/
MAX6794
MAX6795/
MAX6796
NAME FUNCTION
1, 2 1, 2 — OUT1
Regulator 1 Output. Fixed (+1.8V, +2.5V, +3.3V, or +5V) or adjustable (+1.8V
to +11V). V
OUT1
= 150mA (max). Connect a 10µF (min) capacitor from OUT1
to GND.
3 3 — SET1
Feedback Input for Setting the OUT1 Voltage. Connect SET1 to GND to select
the preset output voltage. Connect to an external resistive divider for
adjustable output operation.
4 4 4 PFO
Active-Low, Open-Drain, Power-Fail Comparator Output. PFO asserts low
when PFI is below the internal 1.231V threshold. PFO deasserts when PFI is
above the internal 1.231V threshold.
5 5 5 CSWT
Watchdog Timeout Period Adjust Input. Connect CSWT to OUT1/OUT for the
internally fixed watchdog timeout period. For adjustable watchdog timeout
period, connect a capacitor from CSWT to GND. See the Selecting Watchdog
Timeout Period section for more details.
6 6 6 CSRT
Reset Timeout Period Adjust Input. Connect CSRT to OUT1/OUT for the
internally fixed timeout period. For adjustable timeout, connect a capacitor
from CSRT to GND. See the Reset Output section for more details.
7 7 7 GND Ground
8 8 8 RESET
Active-Low Reset Output. RESET remains low while OUT1/OUT is below the
reset threshold. RESET remains low for the duration of the reset timeout
period after the reset conditions end. RESET is available in push-pull and
open-drain options.
MAX6791–MAX6796
High-Voltage, Micropower, Single/Dual Linear
Regulators with Supervisory Functions
______________________________________________________________________________________ 11
Pin Description (continued)
PIN
MAX6791/
MAX6792
MAX6793/
MAX6794
MAX6795/
MAX6796
NAME FUNCTION
9 — — WDS1
10 — — WDS0
Min/Max Watchdog Logic-Select Input. WDS0 and WDS1 select the watchdog
window ratio or disable the watchdog timer. Drive WDS0 and WDS1 high or
low to select the desired ratio, see Table 4.
11 11 11 WDI
Watchdog Input.
MAX6793–MAX6796: A falling or rising transition must occur on WDI within the
selected watchdog timeout period or a reset pulse occurs. The watchdog timer
clears when a transition occurs on WDI or whenever RESET is asserted.
MAX6791/MAX6792: WDI falling and rising transitions within periods shorter
than t
WD1
or longer than t
WD2
force RESET to assert low for the reset timeout
period. The watchdog timer begins to count after RESET is deasserted. The
watchdog timer clears when a valid transition occurs on WDI or whenever
RESET is asserted. Connect WDS0 high and WDS1 low to disable the watchdog
timer function. See the Watchdog Timer section.
12 12 12 HOLD
Active-Low Regulator Hold Input. When HOLD is forced low, OUT1/OUT
remains ON even if ENABLE1/ENABLE is pulled low. To shut down the
output of the regulator (OUT/OUT1), release HOLD after ENABLE1/ENABLE is
pulled low. Connect HOLD to OUT1/OUT or leave unconnected if unused.
HOLD is internally connected to OUT/OUT1 through a 2µA current source.
13, 14 13, 14 — OUT2
Regulator 2 Output. OUT2 is a fixed +5V output. Connect a 10µF (min)
capacitor from OUT2 to GND.
15 15 — ENABLE2
Active-High Enable Input 2. Drive ENABLE2 high to turn on OUT2. ENABLE2
is internally connected to ground through a 0.5µA current sink.
16 16 16 PFI
Adjustable Power-Fail Comparator Input. Connect PFI to a resistive-divider to
set the desired PFI threshold. The PFI input is referenced to an accurate
1.231V threshold.
17, 18 17, 18 17, 18 IN Regulator Inputs. Bypass IN with a 1µF capacitor to GND.
19 19 19 GATEP
pFET Gate Drive. Connect GATEP to the gate of a p-channel MOSFET to
provide low drop reverse-battery voltage protection.
20 20 — ENABLE1
Active-High Enable Input 1. Drive ENABLE1 high to turn on OUT1. ENABLE1
is internally connected to ground through a 0.5µA current sink.
— 9 9 WD-DIS
Watchdog Disable Input. Drive WD-DIS low to disable the watchdog timer.
Drive WD-DIS high or connect to OUT/OUT1 to enable the watchdog timer.
The watchdog timer clears when reset asserts.
MAX6791–MAX6796
High-Voltage, Micropower, Single/Dual Linear
Regulators with Supervisory Functions
12 ______________________________________________________________________________________
Detailed Description
The MAX6791–MAX6796 ultra-low-quiescent-current,
single-/dual-output, high-input-voltage linear regulators
operate from 5V to 72V. The MAX6791–MAX6794 fea-
ture dual regulators that deliver up to 150mA of load
current per output. One output is available with preset
output-voltage options (+1.8V, +2.5V, +3.3V, and
+5.0V) and can be adjusted to any voltage between
+1.8V to +11V using an external resistive-divider at
SET1. The other output provides a fixed 5V output volt-
age. The MAX6795/MAX6796 feature a single regulator
that delivers up to 300mA of current with preset output-
voltage options (+1.8V, +2.5V, +3.3V, and +5.0V) or
can be adjusted to any voltage between +1.8V to +11V.
All devices include an integrated µP reset circuit with a
fixed/adjustable reset and watchdog timeout period.
The MAX6791–MAX6796 monitor OUT/OUT1 and
assert a reset output when the output falls below the
reset threshold.
Regulators
The single and dual regulators accept an input voltage
from 5V to 72V. The MAX6791–MAX6796 offer fixed
preset output voltages of +1.8V, +2.5V, +3.3V, and
+5V, or an adjustable output voltage of +1.8V to +11V,
selected using an external resistive-divider network
connected between OUT1/OUT, SET1/SET, and GND
(see Figure 1). In addition to an adjustable output, the
MAX6791–MAX6794 feature a fixed 5V output voltage.
Reset Output
The reset output is typically connected to the reset
input of a µP. A µP’s reset input starts or restarts the µP
in a known state. The MAX6791–MAX6796 supervisory
circuits provide the reset logic output to prevent code-
execution errors during power-up, power-down, and
brownout conditions (see the
Typical Application
Circuit
). RESET changes from high to low whenever the
monitored output voltage drops below the reset thresh-
old voltage or the watchdog timeout expires. Once the
monitored voltage exceeds its respective reset thresh-
old voltage, RESET remains low for the reset timeout
period, then goes high.
Pin Description (continued)
PIN
MAX6791/
MAX6792
MAX6793/
MAX6794
MAX6795/
MAX6796
NAME FUNCTION
— 10
10, 13, 14,
15
N.C. Not Internally Connected
— — 1, 2 OUT
Regulator Output. Fixed +5V, +3.3V, +2.5V, +1.8V, or adjustable output
(+1.8V to +11V). Connect a 10µF (min) capacitor from OUT to GND.
— — 3 SET
Feedback Input for Setting the OUT Voltage. Connect SET to GND to select
the preset output voltage. Connect to an external resistive-divider for
adjustable output operation.
— — 20 ENABLE
Active-High Enable Input. Drive ENABLE high to turn on the regulator.
ENABLE is internally connected to ground through a 0.5µA current sink.
— — — EP
Exposed Pad. EP is internally connected to GND. Connect EP to the ground
plane to provide a low thermal-resistance path from the IC junction to the PC
board. Do not use as the electrical connection to GND.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24

MAX6796TPLD0+T

Mfr. #:
Buy MAX6796TPLD0+T
Manufacturer:
Maxim Integrated
Description:
Linear Voltage Regulators Single uPower Linear
Lifecycle:
New from this manufacturer.
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