MAX6796TPLD4+T Maxim Integrated Products, MAX6796TPLD4+T Datasheet - Page 17

• Manufacturer Part Number: MAX6796TPLD4+T
• Description: IC REG LIN W/SPR VSR 20-TQFN
• Manufacturer: Maxim Integrated Products
• Type: Regulator/Supervisorr

Specifications of MAX6796TPLD4+T

• Number Of Voltages Monitored: 1
• Output: Push-Pull, Totem Pole
• Reset: Active Low
• Reset Timeout: 140 ms Minimum
• Voltage - Threshold: 4.625V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 20-TQFN Exposed Pad
• Number Of Outputs: 1
• Polarity: Positive
• Input Voltage Max: 72 V
• Output Voltage: 1.8 V to 11 V, 5 V
• Output Type: Adjustable, Fixed
• Dropout Voltage (max): 0.13 V at 20 mA
• Output Current: 300 mA
• Line Regulation: 1 %
• Load Regulation: 2 %
• Maximum Power Dissipation: 2.6667 W
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The MAX6791–MAX6796 feature dual-mode operation:
these devices operate in either a preset voltage mode
or an adjustable mode. In preset voltage mode, internal
trimmed feedback resistors set the internal linear regula-
tor to +1.8V, +2.5V, +3.3V, or +5V (see the Selector
Guide). Select preset voltage mode by connecting SET1
(MAX6791–MAX6794)/SET(MAX6795/MAX6796) to
GND. In adjustable mode, select an output voltage
between +1.8V and +11V using two external resistors
connected as a voltage-divider to SET1/SET (see Figure
1). Set the output voltage using the following equation:
where V
The MAX6791–MAX6794 provide up to 150mA per out-
put, and the MAX6795/MAX6796 provide up to 300mA
of load current. Since the input voltage can be as high
as +72V, package power dissipation limits the amount
of output current available for a given input/output volt-
age and ambient temperature. Figure 2 shows the max-
imum power-dissipation curve for the MAX6791–
MAX6796. The graph assumes that the exposed metal
pad of the device package is soldered to a solid 1in
section of PC board copper. Use Figure 2 to determine
the allowable package dissipation for a given ambient
temperature. Alternately, use the following formula to
calculate the allowable package dissipation:
PD
< T
where 0.0333W is the MAX6791–MAX6796 package
thermal derating in W/°C and T
ature in °C.
After determining the allowable package dissipation,
calculate the maximum output current using the follow-
ing formula:
Also, I
PD < PD
MAX6795/MAX6796.
Also, I
PD < PD
≤ 150mA in any case.
MAX
A
≤ +125°C
OUT
OUT1
High-Voltage, Micropower, Single/Dual Linear
OUT2) x I
Available Output-Current Calculation
= [2.666W - 0.0333W x (T
SET
PD
MAX
MAX
should be ≤ 300mA in any case.
PD
MAX
= 1.2315V and R1, R2 ≤ 200kΩ.
should be ≤ 150mA and I
where PD = [(IN - OUT1) x I
MAX
V
where PD = [(IN - OUT) x I
Applications Information
OUT
PD = Power Dissipation
= Maximum Power Dissipation
OUT2
______________________________________________________________________________________
= 2.666W, for T
=
Regulators with Supervisory Functions
], for MAX6791–MAX6794.
Output Voltage Selection
V
SET



1
A
+
is the ambient temper-
A
A
R
R
≤ +70°C
1
2
- 70°C)], for +70°C



OUT2
OUT1
should be
OUT
] + [(IN -
], for
2
The reset timeout period is adjustable to accommodate
a variety of µP applications. Adjust the reset timeout
period by connecting a capacitor between CSRT and
GND. Use the following formula to set the reset timeout
period:
where t
Connect CSRT to OUT1 (MAX6791–MAX6794) or to
OUT (MAX6795/MAX6796) to select an internally fixed
timeout period. Connect CSRT to GND to force RESET
low. C
capacitor. Ceramic capacitors are recommended; do
not use capacitors lower than 100pF to avoid the influ-
ence of parasitic capacitances.
Figure 1. Setting the Output Voltage Using a Resistive-Divider
Figure 2. Maximum Power Dissipation for MAX6791–MAX6796
CSRT
RP
t
is in seconds and C
350
300
250
200
150
100
RP
50
0
must be a low-leakage (< 10nA) type
0
Selecting Reset Timeout Period
=
10
C
CSRT
+70°C
MAX6791–MAX6796
I
20
+85°C
OUT
SAFE OPERATION REGION FOR
EACH TEMPERATURE POINT IS
UNDER THE CURVE
vs. (V
+125°C
(V
GND
30
V
IN



IN
IN
1 218
- V
OUT1/OUT
.
SET1/SET
40
IN
OUT
V
CSRT
- V
OUT
) (V)
50
OUT
= 1.8V
×
)
10
is in Farads.
60
6
V
A
R1
R2
70 75



17