参数资料
| 型号： | SCCSP900842R2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 9/15页 |
| 文件大小： | 0K |
| 描述： | IC POWER MGT 36-WLCSP |
| 标准包装： | 3,000 |
| 应用： | PC，PDA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 36-UFBGA，WLCSP |
| 供应商设备封装： | 36-WLCSP |
| 包装： | 带卷 (TR) |
FUNCTIONAL DESCRIPTION
INTRODUCTION
FUNCTIONAL DESCRIPTION
INTRODUCTION
The 900842 consists of an integrated switched-mode
synchronous Buck-Boost DC/DC converter and its control
circuit, a linear regulator, and a bandgap voltage reference.
The 900842 is supplied from a single Lithium-Ion battery
4.7 V, to a fixed output voltage of 3.3 V. A high switching
frequency of 1.625 MHz enables the use of small passive
filter components, and improves the dynamic response of the
converter.
cell, and steps down or up an input voltage range of 2.8 -
BUCK/BOOST CONVERTER
The integrated Buck-Boost converter is used to generate
the fixed output voltage of 3.3 V. The IC operates in Buck
mode when V IN is greater that 3.3 V and in Boost mode
otherwise.
When in Buck mode, M1 is used as a high side FET, M2 is
used as a low side synchronous rectifier FET, M4 is on, and
M3 is open ( Figure 2 ). When in Boost mode, M1 is on, M2 is
open, M3 is the switching FET, and M4 is the synchronous
rectifier FET.
The IC transitions seamlessly between Buck and Boost
mode following the variation in the input voltage, V IN . The
Buck-Boost converter is compensated internally.
There are 2 output pins that can be used to monitor the
status of the IC:
STTS - Status output pin, active low.
STTS = 0 if the output voltage V OUTP is up
STTS =1 if the IC is under thermal shutdown, IC is in
current limit, or V OUTP is too low.
ISNS - Current sense pin
The ISNS pin voltage is proportional to the average output
current. When PVIN = 3.6 V, a typical ratio is 2.084 V/A.
Current Limiting
A peak current limit circuit protects the converter during
overload conditions. If the current through the PMOS power
switch M1 exceeds the I LIM33 value, M1 will turn off and the
converter will skip the next cycle. This forces the inductor
current to be reduced to a safe value. The PMOS power
switch M1 is turned on again and the cycle is repeated until
the load current is reduced.
Low Power Mode
A Low Power Mode is provided in the IC to minimize
system power dissipation at low loads. In Low Power Mode,
the IC operates as an LDO, with a quiescent current of 1mA.
To enter Low Power Mode, a voltage of 1.2 V must be
applied to the EN pin. The Low Power Mode can only be
entered after the Buck-Boost has started up in Normal
Operation (EN = 1.8 V).
LOW DROPOUT LINEAR REGULATOR
The low dropout (LDO) linear regulator uses the bandgap
as a reference and provides a low noise supply. The nominal
regulator output voltage, V REGOUT , is 2.775 V and is
designed for a steady state maximum current of 100 mA. The
V REGOUT voltage will decrease when the load demands
currents exceeding the current limit.
900842
Analog Integrated Circuit Device Data
Freescale Semiconductor
9
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