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| 型号： | LTC3602EFE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 16TSSOP |
| 标准包装： | 95 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 9.5 V |
| 输入电压： | 4.5 V ~ 10 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 2.5A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-TSSOP-EP |
| 产品目录页面： | 1335 (CN2011-ZH PDF) |
LTC3602
OPERATION
Dropout Operation
When the input supply voltage decreases toward the output
voltage, the duty cycle increases toward the maximum
on-time. Further reduction of the supply voltage forces the
top switch to remain on for more than one cycle until it
attempts to stay on continuously. In order to replenish the
voltage on the ?oating BOOST supply capacitor, however,
the top switch is forced off and the bottom switch is forced
on for approximately 85ns every sixteen clock cycles. This
achieves an effective duty cycle that can exceed 99%. The
output voltage will then be primarily determined by the
input voltage minus the voltage drop across the upper
internal N-channel MOSFET and the inductor.
Slope Compensation and Inductor Peak Current
Slope compensation provides stability in constant-fre-
quency architectures by preventing subharmonic oscilla-
tions at duty cycles greater than 50%. It is accomplished
internally by adding a compensating ramp to the inductor
current signal at duty cycles in excess of 30%. Normally,
the maximum inductor peak current is reduced when
slope compensation is added. In the LTC3602, however,
slope compensation recovery is implemented to reduce
the variation of the maximum inductor peak current (and
therefore the maximum available output current) over the
range of duty cycles.
Short-Circuit Protection
When the output is shorted to ground, the inductor cur-
rent decays very slowly during a single switching cycle.
To prevent current runaway from occurring, a secondary
current limit is imposed on the inductor current. If the
inductor valley current increases to more than 4.5A, the
top power MOSFET will be held off and switching cycles
will be skipped until the inductor current is reduced.
Overtemperature Protection
When using the LTC3602 in an application circuit, care
must be taken not to exceed any of the ratings speci-
?ed in the Absolute Maximum Ratings section. As an
added safeguard, however, the LTC3602 does incorporate
an overtemperature shutdown feature. If the junction
temperature reaches approximately 150°C, both power
switches will be turned off and the SW node will become
high impedance. After the part has cooled to below 115°C,
it will restart.
Voltage Tracking and Soft-Start
Some microprocessors and DSP chips need two power
supplies with different voltage levels. These systems often
require voltage sequencing between the core power supply
and the I/O power supply. Without proper sequencing,
latch-up failure or excessive current draw may occur that
could result in damage to the processor’s I/O ports or the
I/O ports of a supporting system device such as memory,
an FPGA or a data converter. To ensure that the I/O loads
are not driven until the core voltage is properly biased,
tracking of the core supply and the I/O supply voltage is
necessary.
Voltage tracking is enabled by applying a ramp voltage to
the TRACK/SS pin. When the voltage on the TRACK pin
is below 0.6V, the feedback voltage will regulate to this
tracking voltage. When the tracking voltage exceeds 0.6V,
tracking is disabled and the feedback voltage will regulate
to the internal reference voltage.
The TRACK/SS pin is also used to implement an external
soft-start function. A 1.2μA current is sourced from this
pin so that an external capacitor may be added to create
a smooth ramp. If this ramp is slower than the internal
1ms soft-start, then the output voltage will track this ramp
during start up instead. Leave this pin ?oating to use the
internal 1ms soft-start ramp. Do not tie the TRACK/SS
pin to INTV CC or to PV IN .
3602fb
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