參數(shù)資料
型號： MAX15010
廠商： Maxim Integrated Products, Inc.
英文描述： Automotive 300mA LDO Voltage Regulators with Tracker Output and Overvoltage Protector
中文描述： 用于汽車電子的300mA LDO穩(wěn)壓器，提供跟蹤輸出和過壓保護(hù)
文件頁數(shù)： 19/23頁
文件大?。?/td> 479K
代理商： MAX15010
Calculate the discharge time, t
1
, using the following
equation:
where t
1
is in ms, V
OV
is the adjusted overvoltage
threshold in volts, I
LOAD
is the external load current in
mA, and I
GATEPD
is the 63mA (typ) internal pulldown
current of GATE. C
SOURCE
is the value of the capacitor
connected between the source of the MOSFET and
PGND in μF.
GATE Delay Time (t
2
)
When SOURCE falls 4% below the overvoltage threshold
voltage, the internal current sink is disabled and the
internal charge pump begins recharging the external
GATE voltage. Due to the external load, the SOURCE
voltage continues to drop until the gate of the MOSFET is
recharged. The time needed to recharge GATE and re-
enhance the external MOSFET is approximately:
where t
2
is in μs, C
iss
is the input capacitance of the
MOSFET in pF, and V
GS(TH)
is the gate-to-source thresh-
old voltage of the MOSFET in volts. V
F
is the 0.7V (typ)
internal clamp diode forward voltage of the MOSFET in
volts, and I
GATE
is the charge-pump current 45μA (typ).
Any external capacitance between GATE and PGND will
add up to C
iss
.
During t
2
, the SOURCE capacitance, C
SOURCE
, loses
charge through the output load. The voltage across
C
SOURCE
,
Δ
V
2
, decreases by
Δ
V
2
until the MOSFET
reaches its V
GS(TH)
threshold. Approximate
Δ
V
2
using
the following formula:
SOURCE Output Charge Time (t
3
)
Once the GATE voltage exceeds the gate-to-source thresh-
old, V
GS(TH)
, of the external MOSFET, the MOSFET turns
on and the charge through the internal charge pump with
respect to the drain potential, Q
G
, determines the slope of
the output-voltage rise. The time required for the SOURCE
voltage to rise again to the overvoltage threshold is:
where
Δ
V
SOURCE
= (V
OV
x 0.04) +
Δ
V
2
in volts, and
C
rss
is the MOSFET’s reverse transfer capacitance in
pF. Any external capacitance between GATE and
PGND adds up to C
rss
.
Power Dissipation/Junction Temperature
During normal operation, the MAX15008/MAX15010
has two main sources of internal power dissipation: the
LDO and the voltage tracker.
Calculate the power dissipation due to the LDO as:
P
LDO
= (V
IN
- V
OUT_LDO
) x I
OUT_LDO
where V
IN
is the LDO input supply voltage in volts,
V
OUT_LDO
is the output voltage of the LDO in volts, and
I
OUT_LDO
is the LDO total load current in mA.
Calculate power dissipation due to the tracker as:
P
TRK
= (V
TRACK
- V
OUT_TRK
) x I
OUT_TRK
where V
TRACK
is the tracker input supply voltage in
volts, V
OUT_TRK
is the output voltage of the tracker in
volts, and I
OUT_TRK
is the tracker load current in mA.
The total power dissipation P
DISS
in mW as:
P
DISS
= P
LDO
+ P
TRK
For prolonged exposure to overvoltage events, use the
V
IN
and V
TRACK
voltages expected during overvoltage
conditions. Under these circumstances the corre-
sponding internal power dissipation contribution, P
OVP
,
calculated in the Overvoltage-Limiter Mode Switching
Frequency section should also be included in the total
power dissipation, P
DISS
.
For a given ambient temperature, T
A
, calculate the
junction temperature, T
J
, as follows:
T
J
= T
A
+ P
DISS
x
θ
JA
where T
J
and T
A
are in °C and
θ
JA
is the junction-to-
ambient thermal resistance in °C/W as listed in the
Absolute Maximum Ratings section.
The junction temperature should never exceed +150°C
during normal operation.
Thermal Protection
When the junction temperature exceeds T
J
= +160°C,
the MAX15008/MAX15010 shut down to allow the
device to cool. When the junction temperature drops to
+140°C, the thermal sensor turns all enabled blocks
on again, resulting in a cycled output during continu-
ous thermal-overload conditions. Thermal protection
protects the MAX15008/MAX15010 from excessive
power dissipation. For continuous operation, do not
exceed the absolute maximum junction temperature
rating of +150°C.
t
C
V
I
rss
SOURCE
GATE
3
=
× Δ
Δ
V
I
C
t
LOAD
SOURCE
2
2
=
×
t
C
V
V
I
iss
GS TH
(
F
GATE
2
=
×
+
)
t
C
0.04
V
I
I
1
SOURCE
OV
LOAD
GATEPD
=
×
×
+
M
Automotive 300mA LDO Voltage Regulators
with Tracker Output and Overvoltage Protector
______________________________________________________________________________________
19
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MAX15010ATJ+ 功能描述:低壓差穩(wěn)壓器 - LDO Automotive 300mA w/Tracker Output RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
MAX15010ATJ+T 功能描述:低壓差穩(wěn)壓器 - LDO Automotive 300mA w/Tracker Output RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
MAX15011ATJ+ 功能描述:低壓差穩(wěn)壓器 - LDO Automotive 300mA w/Switched Output RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
MAX15011ATJ+T 功能描述:低壓差穩(wěn)壓器 - LDO Automotive 300mA w/Switched Output RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
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