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參數(shù)資料
| 型號： | SP7648TR |
| 英文描述： | Low Reference High Efficiency Boost Regulator |
| 中文描述： | 高效率低參考升壓穩(wěn)壓器 |
| 文件頁數(shù)： | 3/12頁 |
| 文件大小： | 236K |
| 代理商： | SP7648TR |
3
Date: 7/20/05
SP7648 Ultra-low Quiescent Current, High Efficiency Boost Regulator Copyright 2005 Sipex Corporation
PIN DESCRIPTION
PIN NUMBER
PIN NAME
DESCRIPTION
1
V
BATT
Battery Voltage. The startup circuitry is powered by this pin. Battery
Voltage is used to calculate switch off time: T
OFF
= K
OFF
/ (V
OUT
-
V
BATT
). When the battery voltage drops below 0.61V the SP7648
goes into an undervoltage lockout mode (UVLO), where the part is shut
down.
2
FLASH
Reference Control Input. Internal Reference defaults to 0.8V if FLASH
= LOW and 0.288V if FLASH = HIGH.
3
NC (Test)
No connection. This pin is bonded out for test purposes only and
must be left floating in all applications.
4
R
LIM
Current Limit Resistor. By connecting a resistor R
LIM
from this pin to
ground the inductor peak current is set by I
PEAK
=1600/R
LIM
. The range
for R
LIM
is 9k
(for 180mA) to 1.K
(for 1.6A).
5
SHDN
Shutdown
Not.
Tie this pin high to V
BATT,
for normal operation. Pull
this pin to ground to disable all circuitry inside the chip.
6
FB
Feedback. Connect this pin to GND for fixed +5V operation. Connect
this pin to a resistor voltage divider between V
OUT
and GND for
adjustable output operation.
7
GND
Ground. Connect to ground plane.
8
PGND
Power Ground. The inductor charging current flows out of this pin.
9
LX
Inductor Switching Node. Connect one terminal of the inductor to the
positive terminal of the battery. Connect the second terminal of the
inductor to this pin. The inductor charging current flows into LX,
through the internal charging N-channel FET, and out the PGND pin.
10
V
OUT
Output Voltage. The inductor current flows out of this pin during
switch off-time. It is also used as the internal regulator voltage supply.
Connect this pin to the positive terminal of the output capacitor.
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