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参数资料
| 型号： | LTC3200ES6-5#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/12页 |
| 文件大小： | 0K |
| 描述： | IC REG SWITCHED CAP DBL SOT23-6 |
| 标准包装： | 1 |
| 类型： | 切换式电容器（充电泵），倍增器 |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 2.7 V ~ 4.5 V |
| 频率 - 开关： | 2MHz |
| 电流 - 输出： | 100mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 细型，TSOT-23-6 |
| 包装： | 标准包装 |
| 供应商设备封装： | TSOT-23-6 |
| 产品目录页面： | 1339 (CN2011-ZH PDF) |
| 其它名称： | LTC3200ES6-5#TRMPBFDKR |
LTC3200/LTC3200-5
OPERATIO
Operation (Refer to Simplified Block Diagrams)
The LTC3200/LTC3200-5 use a switched capacitor charge
pump to boost V IN to a regulated output voltage. Regula-
tion is achieved by sensing the output voltage through an
internal resistor divider (LTC3200-5) and modulating the
charge pump output current based on the error signal. A
2-phase nonoverlapping clock activates the charge pump
switches. The flying capacitor is charged from V IN on the
first phase of the clock. On the second phase of the clock
it is stacked in series with V IN and connected to V OUT . This
sequence of charging and discharging the flying capacitor
continues at a free running frequency of 2MHz (typ).
ensure that V OUT is at 0V in shutdown on the adjustable
LTC3200 a bleed resistor may be needed from V OUT to GND.
Typically 10k to 100k is acceptable.
Soft-Start
The LTC3200/LTC3200-5 have built-in soft-start circuitry
to prevent excessive current flow at V IN during start-up.
The soft-start time is preprogrammed to approximately
1ms, so the start-up current will be primarily dependent
upon the output capacitor. The start-up input current can
be calculated with the expression:
In shutdown mode all circuitry is turned off and the
LTC3200/LTC3200-5 draw only leakage current from the
I STARTUP = 2 C OUT
V OUT
1 ms
=
V IN supply. Furthermore, V OUT is disconnected from V IN .
The SHDN pin is a CMOS input with a threshold voltage of
approximately 0.8V. The LTC3200/LTC3200-5 is in shut-
down when a logic low is applied to the SHDN pin. Since
the SHDN pin is a high impedance CMOS input it should
never be allowed to float. To ensure that its state is defined
it must always be driven with a valid logic level.
Short-Circuit/Thermal Protection
The LTC3200/LTC3200-5 have built-in short-circuit current
limiting as well as overtemperature protection. During
short-circuit conditions, they will automatically limit their
output current to approximately 225mA. At higher tempera-
tures, or if the input voltage is high enough to cause exces-
sive self heating on chip, thermal shutdown circuitry will
shut down the charge pump once the junction temperature
exceeds approximately 160 ° C. It will reenable the charge
pump once the junction temperature drops back to approxi-
mately 155 ° C. The LTC3200/LTC3200-5 will cycle in and
out of thermal shutdown indefinitely without latch-up or
damage until the short-circuit on V OUT is removed.
For example, with a 2.2 μ F output capacitor the start-up
input current of an LTC3200-5 will be approximately
22mA. If the output capacitor is 10 μ F then the start-up
input current will be about 100mA.
Programming the LTC3200 Output Voltage (FB Pin)
While the LTC3200-5 version has an internal resistive
divider to program the output voltage, the programmable
LTC3200 may be set to an arbitrary voltage via an external
resistive divider. Since it employs a voltage doubling
charge pump, it is not possible to achieve output voltages
greater than twice the available input voltage. Figure 1
shows the required voltage divider connection.
The voltage divider ratio is given by the expression:
R 1 V OUT
– 1
R 2 1 . 268 V
Typical values for total voltage divider resistance can
range from several k ? s up to 1M ? .
( )
Shutdown Current
Since the output voltage can go above the input voltage,
special circuitry is required to control internal logic.
Detection logic will draw an input current of 5 μ A when the
LTC3200 is in shutdown. However, this current will be
V OUT
FB
PGND
SGND
8
7
4
5
R1
R2
V OUT
1.268V 1 + R1
R2
C OUT
32005 F01
eliminated when the output voltage (V OUT ) is at 0V. To
Figure 1. Programming the Adjustable LTC3200
6
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