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ST619 数据表(PDF) 2 Page - STMicroelectronics

部件名 ST619
功能描述  DC-DC CONVERTER REGULATED 5V CHARGE PUMP
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

ST619 数据表(HTML) 2 Page - STMicroelectronics

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ST619LB SERIES
2/9
OPERATING PRINCIPLE
The ST619LB is able to provide a regulated 5V
output from a 2V to 3.6V (two battery cells) input.
Internal charge pump and external capacitors
generate the 5V output, eliminating the need for
inductors. The output voltage is regulated to 5V,
±4% by a pulse skipping controller that turns on
the charge pump when the output voltage begins
to drop. To maintain the greatest efficiency the
internal charge pump of the device operates as a
voltage doubler when VI ranges from 3.0V to 3.6V
and as a voltage tripler when VI ranges from 2.0V
to 2.5V.
When VI ranges from 2.5V to 3.0V , the ST619LB
switches between doubler and tripler mode on
alternating cycles, making a 2.5 x VI charge pump.
To further enhance the efficiency over the input
range, an internal comparator selects the higher of
VI or VO to run the ST619LB’s circuitry. With VI =
2V and IO = 20mA the typical efficiency value is
80%.
In tripler mode (see block diagram), when the S1
switches close, the S2 switches open and
capacitors C1 and C2 charge up to VI. On the
second half of the cycle, C1 and C2 are connected
in series between IN and OUT when the S1
switches open and S2 switches close. In the
doubler mode only C2 is used. During one
oscillator cycle, energy is transferred from the
input to the charge pump capacitors, and then
from the charge pump capacitors to the output
capacitors and load. The number of cycles within
a given time frame increases as the load
increases
or
as
the
input
supply
voltage
decreases. In the limiting case , the charge pumps
operate continuously, and the oscillator frequency
is nominally 500kHz.
Shut Down Mode
The ST619LB enters low power shut down mode
when SHDN is a logic high. In shut down mode,
OUT is disconnected from the IN and VO falls to
0V. The SHDN pin is connected to ground for
normal operation. SHDN is a CMOS compatible
input.
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.
THERMAL DATA
(*) This value depends from thermal design of PCB on which the device is mounted.
Symbol
Parameter²
Value
Unit
VI
DC Input Voltage
-0.3 to 5.5
V
VO
Output Voltage
-0.3 to 5.5
V
VSHDN
Shutdown Input Voltage
-0.3 to (VI + 0.3)
V
IO
Output Current Continuous
120
mA
Tstg
Storage Temperature Range
-55 to +150
°C
Top
Operating Junction Temperature Range
-40 to +85
°C
Symbol
Parameter
SO-8
DIP-8
Unit
Rthj-amb
Thermal Resistance Junction-ambient (*)
160
100
°C/W


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