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LT1313CS Datasheet

  • LT1313CS

  • Linear Technology [Dual PCMCIA VPP Driver/Regulator]

  • 253.33KB

  • LINER

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LT1313
APPLICATIONS INFORMATION
The fall time from 12V to 0V is set by the output capacitor
and an internal pull-down current source which sinks
about 30mA. This source will fully discharge a 1碌F capaci-
tor in less than 1ms.
Thermal Considerations
Power dissipated by the device is the sum of two compo-
nents: output current multiplied by the input-output differ-
ential voltage: I
OUT
脳
(V
IN
鈥?V
OUT
), and ground pin current
multiplied by supply voltage: (I
GND
脳
V
IN
).
The ground pin current can be found by examining the
Ground Pin Current curves in the Typical Performance
Characteristics section.
Heat sinking, for surface mounted devices, is accom-
plished by using the heat spreading capabilities of the PC
board and its copper traces.
The junction temperature of the LT1313 must be limited to
125擄C to ensure proper operation. Use Table 1, in con-
junction with the typical performance graphs, to calculate
the power dissipation and die temperature for a particular
application and ensure that the die temperature does not
exceed 125擄C under any operating conditions.
Table 1. 16-Pin SO Package*
COPPER AREA
TOPSIDE
2500 sq mm
1000 sq mm
225 sq mm
1000 sq mm
BACKSIDE
2500 sq mm
2500 sq mm
2500 sq mm
1000 sq mm
BOARD AREA
2500 sq mm
2500 sq mm
2500 sq mm
1000 sq mm
THERMAL RESISTANCE
(JUNCTION-TO-AMBIENT)
120擄C/W
120擄C/W
125擄C/W
131擄C/W
* Device is mounted on topside.
U
W
U
U
Calculating Junction Temperature
Example: given an output voltage of 12V, an input supply
voltage of 14V, and an output current of 100mA (one VPP
output), and a maximum ambient temperature of 50擄C,
what will the maximum junction temperature be?
Power dissipated by the device will be equal to:
I
OUT
脳
(V
S
鈥?VPP
OUT
) + (I
GND
脳
V
IN
)
where,
I
OUT
= 100mA
V
IN
= 14V
I
GND
at (I
OUT
= 100mA, V
IN
= 14V) = 5mA
so,
P
D
= 100mA
脳
(14V 鈥?2V) + (5mA
脳
15V) = 0.275W
Using Table 1, the thermal resistance will be in the range
of 120擄C/W to 131擄C/W depending upon the copper area.
So the junction temperature rise above ambient will be
less than or equal to:
0.275W
脳
131擄C/W = 36擄C
The maximum junction temperature will then be equal to
the junction temperature rise above ambient plus the
maximum ambient temperature or:
T
JMAX
= 50擄C + 36擄C = 86擄C
For more detailed applications information, see the LT1312
Single PCMCIA VPP Driver/Regulator data sheet.
7

LT1313CS 產(chǎn)品屬性

  • LT1313

  • 50

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - 專用型

  • -

  • PCMCIA 驅(qū)動器/穩(wěn)壓器，PCMCIA 卡槽

  • 13 V ~ 20 V

  • 2

  • 3.3V，5V，12V

  • 0°C ~ 70°C

  • 表面貼裝

  • 16-SOIC（0.154"，3.90mm 寬）

  • 16-SOIC

  • 管件

  • LT1313CS8LT1313CS8-ND

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