MAX5087BATE/V+T Maxim Integrated Products, MAX5087BATE/V+T Datasheet - Page 9

• Manufacturer Part Number: MAX5087BATE/V+T
• Description: IC REG LDO 5V/ADJ 400MA 16-TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX5087BATE/V+T

• Regulator Topology: Positive Fixed or Adjustable
• Voltage - Output: 5V, 2.5 ~ 11 V
• Voltage - Input: 6.5 ~ 45 V
• Voltage - Dropout (typical): 0.9V @ 400mA
• Number Of Regulators: 1
• Current - Output: 400mA (Min)
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Limit (min): -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

The MAX5087 features a Dual Mode
either a preset-voltage mode or an adjustable mode. In
preset-voltage mode, internal feedback resistors set
the MAX5087’s output voltage to +3.3V or +5V. Select
preset-voltage mode by connecting SET to ground. In
adjustable mode, select an output between +2.5V and
+11V using two external resistors connected as a volt-
age-divider to SET (Figure 2). Set the output voltage
using the following equation:
where V
The MAX5087 high-voltage regulator provides up to
400mA of output current. The input voltage extends to
+45V. Package power dissipation limits the amount of
output current available for a given input/output voltage
and ambient temperature. Figure 3 shows the maxi-
mum power dissipation curve for these devices. The
graph assumes that the exposed paddle of the MAX5087
package is set up per JEDEC 51 (multilayer board)
specifications.
Use Figure 3 to determine the allowable package dissi-
pation (P
Alternately, use the following formulas to calculate the
allowable package dissipation. Note that for the exam-
ples shown below, the electrical characteristic limits are
guaranteed up to T
After determining the allowable package dissipation
calculate the maximum output current using the follow-
ing formula:
Dual Mode is a trademark of Maxim Integrated Products, Inc.
P
D
=
Linear Regulator with Adjustable Reset Delay
⎧
⎪
⎨
⎪
⎩
2 666
2 666
Available Output-Current Calculation
SET
.
.
I
OUT(MAX)
D
W for T
W
= 1.235V and R2 is chosen to be < 100kΩ.
) for a given ambient temperature.
V
−
OUT
0 0333
Applications Information
.
A
_______________________________________________________________________________________
≤ +
J
≅
=
°
W
C
= +125°C (max).
70
V
x T
V
Output-Voltage Selection
IN
°
C
(
SET
A
−
P
−
D
V
45V, 400mA, Low-Quiescent-Current
70
OUT
x
°
⎛
⎜
⎝
C for
1
)
+
≤
+
70
R
R
4 0mA
2
1
°
0
TM
C
⎞
⎟
⎠
<
operation, in
T
A
≤ +
125
°
C
⎫
⎪
⎬
⎪
⎭
The above equations do not include the negligible
power dissipation from self-heating due to the IC
ground current.
Example 1:
T
V
V
Find the maximum allowable output current. First calcu-
late package dissipation at the given temperature as
follows:
Then determine the maximum output current:
Example 2:
T
V
V
Figure 3. Calculated Maximum Power Dissipation vs.
Temperature
P
A
A
IN
OUT
IN
OUT
D
= +95°C
= +125°C
= +14V
= +14V
=
= +5V
= +5V
I
2.666W
OUT(MAX)
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
−
2.666W
(16-PIN TQFN)
20
0.0333
=
40
(14V) (5V)
(1.8335W)
TEMPERATURE (°C)
60
°
W
DERATE
33.3mW/°C
C
−
(95 C
80
°
100
−
=
120
70 C)
203mA
°
140
=
1.8335W
9