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参数资料
| 型号： | LTC3734EUH#TR |
| 厂商： | Linear Technology |
| 文件页数： | 22/28页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR DC/DC 1PH HI EFF 32QFN |
| 标准包装： | 2,500 |
| 应用： | 控制器，Intel 移动式 CPU |
| 输入电压： | 4 V ~ 30 V |
| 输出数： | 1 |
| 输出电压： | 0.7 V ~ 1.71 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN 裸露焊盘（5x5） |
| 包装： | 带卷 (TR) |
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LTC3734
APPLICATIONS INFORMATION
? ? 1– OUT ? =
V OUT ? V ? 1.5V
350kHz ? ( 40% ? 20A )
f ? ? I ?
V IN ?
? ? 1– 21V ? ? = 0.5 μ H
t ON(MIN) =
V OUT 1.5V
V IN ? f
= = 204ns
AutomotiveConsiderations:Pluggingintothe
Cigarette Lighter
As battery-powered devices go mobile, there is a natural
interest in plugging into the cigarette lighter in order to
conserve or even recharge battery packs during operation.
But before you connect, be advised: you are plugging into
the supply from hell. The main battery line in an automobile
is the source of a number of nasty potential transients,
including load-dump, reverse-battery and double-battery.
Load-dump is the result of a loose battery cable. When the
cable breaks connection, the field collapse in the alterna-
tor can cause a positive spike as high as 60V which takes
several hundred milliseconds to decay. Reverse-battery is
just what it says, while double-battery is a consequence of
tow truck operators finding that a 24V jump start cranks
cold engines faster than 12V.
The network shown in Figure 7 is the most straightforward
approach to protect a DC/DC converter from the ravages
of an automotive power line. The series diode prevents
current from flowing during reverse-battery, while the
transient suppressor clamps the input voltage during
load-dump. Note that the transient suppressor should
not conduct during double-battery operation, but must
still clamp the input voltage below breakdown of the
converter. Although the LTC3734 has a maximum input
voltage of 32V, most applications will be limited to 30V
by the MOSFET BV DSS .
V BAT
12V
Design Example
As a design example, assume V IN = 12V (nominal),
V IN = 21V (max), V OUT = 1.5V, I MAX = 20A, and f = 350kHz.
The inductance value is chosen first based on a 40% ripple
current assumption. The highest value of ripple current
occurs at the maximum input voltage. The minimum
inductance for 40% ripple current is:
L ≥ ?
? 1.5V ?
The peak inductor current will be the maximum DC current
plus one half of the ripple current, or 24A.
Tie the FREQSET pin to 1.2V, resistively divided down from
SV CC to have 350kHz operation.
The minimum on-time also occurs at maximum input
voltage:
21V ? 350kHz
which is larger than 150ns, the typical minimum on time
of the LTC3734.
R SENSE can be calculated by using a conservative maximum
sense voltage threshold of 40mV and taking into account
of the peak current:
PV CC
+
R SENSE =
40mV
24A
= 0.002 ?
PV CC
LTC3734
3734 F07
Figure 7. Automotive Application Protection
3734fa
22
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