參數(shù)資料
型號(hào)： TPS60400DBVR
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHED CAPACITOR CONVERTER, 350 kHz SWITCHING FREQ-MAX, PDSO5
封裝： GREEN, PLASTIC, SOT-23, 5 PIN
文件頁(yè)數(shù)： 13/28頁(yè)
文件大?。?/td> 787K
代理商： TPS60400DBVR
TPS60400, TPS60401, TPS60402, TPS60403
UNREGULATED 60mA CHARGE PUMP VOLTAGE INVERTER
SLVS324A JULY 2001 REVISED NOVEMBER 2004
20
WWW.TI.COM
APPLICATION INFORMATION
OUT
IN
C1
TPS60400
C1+
GND
5
4
1
2
3
C(fly)
1
F
5V6
CO
1
F
CI
1
F
VI
GND
VO (VI/2)
GND
Figure 36.
power dissipation
As given in the data sheet, the thermal resistance of the unsoldered package is RθJA = 347°C/W. Soldered on
the EVM, a typical thermal resistance of RθJA(EVM) = 180°C/W was measured.
The terminal resistance can be calculated using the following equation:
RqJA +
T
J *
T
A
P
D
Where:
TJ is the junction temperature.
TA is the ambient temperature.
PD is the power that needs to be dissipated by the device.
RqJA +
T
J *
T
A
P
D
The maximum power dissipation can be calculated using the following equation:
PD = VI × II VO × IO = VI(max) × (IO + I(SUPPLY)) VO × IO
The maximum power dissipation happens with maximum input voltage and maximum output current.
At maximum load the supply current is 0.7 mA maximum.
PD = 5 V × (60 mA + 0.7 mA) 4.4 V × 60 mA = 40 mW
With this maximum rating and the thermal resistance of the device on the EVM, the maximum temperature rise
above ambient temperature can be calculated using the following equation:
TJ = RθJA × PD = 180°C/W × 40 mW = 7.2°C
This means that the internal dissipation increases TJ by <10°C.
The junction temperature of the device shall not exceed 125
°C.
This means the IC can easily be used at ambient temperatures up to:
TA = TJ(max) TJ = 125°C/W 10°C = 115°C
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