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参数资料
| 型号： | LTC1986ES6#TR |
| 厂商： | Linear Technology |
| 文件页数： | 5/8页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SWITCHED CAP SOT23 |
| 标准包装： | 2,500 |
| 类型： | 升压（升压），切换电容（充电泵） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 3V，5V |
| 输入电压： | 2.6 V ~ 4.4 V |
| 频率 - 开关： | 900kHz |
| 电流 - 输出： | 10mA |
| 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： | 带卷 (TR) |
| 供应商设备封装： | TSOT-23-6 |
LTC1986
APPLICATIO N S I N FOR M ATIO N
Operation
The LTC1986 is a charge pump DC/DC converter designed
specifically to supply V CC power for either 3V or 5V SIM
cards. The part can operate in one of three modes: a low
power shutdown mode which disconnects V IN from V OUT
and actively pulls down the V OUT supply, 3V mode which
provides a direct connection between V IN and V OUT for
powering 3V SIM cards, and 5V mode which provides a
regulated 5V output for powering 5V SIM cards. In 5V
mode, regulation is achieved by sensing the output volt-
age through a resistor divider and enabling the charge
pump as needed to maintain regulation.
When the charge pump is enabled, a 2-phase
nonoverlapping clock controls the internal charge pump
switches. Flying capacitor C1 is charged to V IN on phase
one of the clock. On phase two of the clock, C1 is stacked
The three modes can be selected using two totem pole
digital outputs and two external resistors as shown in
Figure 1.
Shutdown mode disconnects V IN from V OUT and enables
an internal pull-down device which forces V OUT to GND.
To achieve the lowest possible quiescent current in shut-
down mode, the voltage on the MODE pin should be pulled
below 0.4V. 3V mode connects V OUT to V IN through a 2.5 ?
internal switch. The LTC1986 has the additional capability
of boosting V OUT to a regulated 2.9V in 3V mode when the
input voltage drops below 2.85V. This ensures that the 3V
SIM V CC specification is not violated if V IN drops below
2.7V during transients or low battery conditions.
V IN
in series with V IN and connected to V OUT through an
V IN
6
internal switch. This sequence of charging and discharg-
ing the flying capacitor occurs at a free-running frequency
of 900kHz (typ) and continues until the divided output
3/5
1M
3
LTC1986
MODE
voltage reaches the upper trip point of the comparator.
750k
Once the output is in regulation, the charge pump is
SHDN
SHDN 3/5
MODE
disabled. This method of bursting the charge pump on and
off enables the LTC1986 to achieve high efficiency at
extremely low output loads.
0
0
1
1
0
1
0
1
SHUTDOWN (I CC < 1 μ A)
SHUTDOWN (I CC = 10 μ A)
V OUT = 5V
V OUT = V IN
1986 F01
Mode Selection
The operating mode is determined by the voltage applied
to the MODE pin. The MODE pin has three voltage thresh-
olds—all of which are referenced to V IN :
Shutdown Mode ? V MODE < V IN /2 – 0.1V
5V Mode ? V IN /2 + 0.1V < V MODE < V IN – 1V
3V Mode ? V IN – 0.25V < V MODE
For example, if V IN = 3V, then the following table applies:
Figure 1
Capacitor Selection
For best performance, it is recommended that low ESR
capacitors be used for both C IN and C OUT to reduce noise
and ripple. The C IN and C OUT capacitors should be either
ceramic or tantalum. Ceramic capacitors will provide the
smallest size for a given capacitance. If the input source
impedance is very low (< 0.5 ? ), C IN may not be needed.
For best performance, C OUT should be 2.2 μ F or greater.
V MODE
0V to 1.4V
1.6V to 2V
2.75V to 3V
OPERATING MODE
Shutdown Mode
5V Mode
3V Mode (V OUT = V IN )
Ceramic capacitors are also recommended for the flying
capacitor C1 with values between 0.047 μ F and 0.22 μ F. If
a small value output capacitor (3.3 μ F or less) is used, a
small flying capacitor should also be used to prevent high
output ripple in 5V mode. The recommended capacitor
values to minimize board space and cost are: C IN = 0.1 μ F,
C1 = 0.047 μ F and C OUT = 2.2 μ F (ceramic).
1986fa
5
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