参数资料
型号: LTC3440EMS#PBF
厂商: Linear Technology
文件页数: 14/20页
文件大小: 0K
描述: IC REG BUCK BST SYNC 0.6A 10MSOP
标准包装: 50
类型: 降压(降压),升压(升压)
输出类型: 可调式
输出数: 1
输出电压: 2.5 V ~ 5.5 V
输入电压: 2.5 V ~ 5.5 V
PWM 型: Burst Mode?
频率 - 开关: 2MHz
电流 - 输出: 600mA
同步整流器:
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 10-TFSOP,10-MSOP(0.118",3.00mm 宽)
包装: 管件
供应商设备封装: 10-MSOP
产品目录页面: 1334 (CN2011-ZH PDF)
LTC3440
APPLICATIO S I FOR ATIO
f POLE 1 ≈
1
Hz
2 ? π ? 32 e 3 ? R 1 ? C P 1
Which is extremely close to DC
traces and external components. Following the recom-
mendations for output voltage >4.3V and input voltage
>4.5V will improve this condition. Additional short-circuit
protection can be accomplished with some external cir-
f ZERO 1 =
f ZERO 2 =
1
2 ? π ? R Z ? C P 1
1
2 ? π ? R 1 ? C Z 1
Hz
Hz
cuitry.
In an overload or short-circuit condition the LTC3440
voltage loop opens and the error amp control voltage on
the V C pin slams to the upper clamp level. This condition
forces boost mode operation in order to attempt to provide
f POLE 2 =
1
2 ? π ? R Z ? C P 2
Hz
more output voltage and the IC hits a peak switch current
limit of 2.7A. When switch current limit is reached switches
B and D turn on for the remainder of the cycle to reverse
+
ERROR
AMP
1.22V
FB
9
V C
10
C P1
V OUT
R1
R2
3440 F07
the volts ? seconds on the inductor. Although this prevents
current run away, this condition produces four switch
operation producing a current foldback characteristic and
the average input current drops. The IC is trimmed to
guarantee greater than 1A average input current to meet
the maximum load demand, but in a short-circuit or
overload condition the foldback characteristic will occur
producing higher peak switch currents. To minimize this
Figure 7. Error Amplifier with Type I Compensation
V OUT
affect during this condition the following circuits can be
utilized.
Restart Circuit
+
ERROR
AMP
1.22V
FB
9
V C
R Z
C P1
R1
R2
C Z1
For a sustained short-circuit the circuit in Figure 9 will
force a soft-start condition. The only design constraint is
that R2/C2 time constant must be longer than the soft-
start components R1/C1 to ensure start-up.
10
C P2
3440 F08
V IN
R1
Figure 8. Error Amplifier with Type III Compensation
SOFT-START
SO/SS
1M
M2
NMOS
VN2222
D1
1N4148
M1
R2
1M
Short-Circuit Improvements
C1
4.7nF
C2
10nF
NMOS
VN2222
V OUT
The LTC3440 is current limited to 2.7A peak to protect the
IC from damage. At input voltages above 4.5V a current
limit condition may produce undesirable voltages to the IC
due to the series inductance of the package, as well as the
3440 F09
Figure 9. Soft-Start Reset Circuitry for a Sustained Short-Circuit
3440fb
14
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LTC3440EMS IC REG BUCK BST SYNC 0.6A 10MSOP
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