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參數(shù)資料
| 型號： | LTM4600 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 10A High Effi ciency DC/DC レModule |
| 中文描述： | 10A條高艾菲布缺陷直流/直流レ模塊 |
| 文件頁數(shù)： | 10/24頁 |
| 文件大?。?/td> | 370K |
| 代理商： | LTM4600 |
LTM4600
10
4600fa
APPLICATIU
the module input pins in the PCB layout to minimize the
trace inductance and high frequency AC noise.
W
U
U
Output Capacitors
The LTM4600 is designed for low output voltage ripple.
The bulk output capacitors C
OUT
is chosen with low enough
effective series resistance (ESR) to meet the output voltage
ripple and transient requirements. C
OUT
can be low ESR
tantalum capacitor, low ESR polymer capacitor or ceramic
capacitor (X5R or X7R). The typical capacitance is 200μF
if all ceramic output capacitors are used. The internally
optimized loop compensation provides sufficient stability
margin for all ceramic capacitors applications. Additional
output filtering may be required by the system designer,
if further reduction of output ripple or dynamic transient
spike is required. Refer to Table 2 for an output capaci-
tance matrix for each output voltage Droop, peak to peak
deviation and recovery time during a 5A/μs transient with
a specific output capacitance.
Fault Conditions: Current Limit and Over current
Foldback
The LTM4600 has a current mode controller, which inher-
ently limits the cycle-by-cycle inductor current not only in
steady state operation, but also in transient.
To further limit current in the event of an over load condi-
tion, the LTM4600 provides foldback current limiting. If the
output voltage falls by more than 50%, then the maximum
output current is progressively lowered to about one sixth
of its full current limit value.
Soft-Start and Latchoff with the RUN/SS pin
The RUN/SS pin provides a means to shut down the
LTM4600 as well as a timer for soft-start and over-cur-
rent latchoff. Pulling the RUN/SS pin below 0.8V puts
the LTM4600 into a low quiescent current shutdown (I
Q
≤ 75μA). Releasing the pin allows an internal 1.2μA cur-
rent source to charge up the timing capacitor CSS. Inside
LTM4600, there is an internal 1000pF capacitor from
RUN/SS pin to ground. If RUN/SS pin has an external
capacitor CSS_EXT to ground, the delay before starting
is about:
When the voltage on RUN/SS pin reaches 1.5V, the
LTM4600 internal switches are operating with a clamping
of the maximum output inductor current limited by the
RUN/SS pin total soft-start capacitance. As the RUN/SS pin
voltage rises to 3V, the soft-start clamping of the inductor
current is released.
t
V
A
C
pF
DELAY
SS EXT
_
=
μ
+
1 5
1 2
.
1000
.
(
)
V
IN
to V
OUT
Stepdown Ratios
There are restrictions in the maximum V
IN
to V
OUT
step
down ratio that can be achieved for a given input voltage.
These contraints are shown in the Typical Performance
Characteristics curves labeled “V
IN
to V
OUT
Stepdown
Ratio”. Note that additional thermal de-rating may apply.
See the Thermal Considerations and Output Current De-
Rating sections of this data sheet.
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