參數(shù)資料
型號: LTC1550CS8-4.1
廠商: LINEAR TECHNOLOGY CORP
元件分類: 穩(wěn)壓器
英文描述: Low Noise, Switched Capacitor Regulated Voltage Inverters
中文描述: SWITCHED CAPACITOR REGULATOR, 900 kHz SWITCHING FREQ-MAX, PDSO8
封裝: 0.150 INCH, PLASTIC, SOP-8
文件頁數(shù): 6/12頁
文件大?。?/td> 319K
代理商: LTC1550CS8-4.1
6
LTC1550/LTC1551
PI
FU
CTIO
N
S
U
U
REG:
This is an open-drain output that pulls low when the
output voltage is within 5% of the set value. It will sink 7mA
to ground with a 5V supply. The external circuitry must
provide a pull-up or REG will not swing high. The voltage
at REG may exceed V
CC
and can be pulled up to 12V above
ground without damage.
ADJ:
For adjustable versions only, this is the feedback
point for the external resistor divider string. Connect a
divider string from AGND to V
OUT
with the divided tap
connected to ADJ. Note that the resistor string needs to be
connected “upside-down” from a traditional negative regu-
lator. See the Applications Information section for hook-
up details.
NC:
No Internal Connection.
BLOCK DIAGRA
M
W
+
+
S2
S3
S1
S4
C
CP
V
CC
CP
OUT
C1
+
C1
CLK
900kHz
SENSE
CHARGE
PUMP
LINEAR
REGULATOR
1550/51 BD
V
OUT
ADJ
REG
C
OUT
60mV
1.18V
*SHDN
*SHDN FOR LTC1550, SHDN FOR LTC1551
** FIXED OUTPUT VERSIONS ONLY
COMP2
**
**
+
1.24V
APPLICATIO
S I
FOR
ATIO
U
OVERVIEW
The LTC1550/LTC1551 are switched capacitor, inverting
charge pumps with internal linear post-regulators. The
LTC1550CS8/LTC1551CS8 provide a regulated, low ripple
–4.1V output at up to 10mA load current from a single 5V
supply. The LTC1550CGN provides a regulated, low ripple
adjustable output. Output load current for the adjustable
version depends on the input/output voltage combination.
W
U
U
Consult the graph provided in the Typical Performance
Characteristics section and the Electrical Characteristics
table for guaranteed test points. The LTC1550/LTC1551
are ideal for use as bias voltage generators for GaAs
transmitter FETs in portable RF and cellular telephone
applications. The LTC1550 features an active-low
Shutdown pin (SHDN) that drops quiescent current to
below 1
μ
A. The LTC1551 is identical to the LTC1550,
相關PDF資料
PDF描述
LTC1551CS8-4.1 Low Noise, Switched Capacitor Regulated Voltage Inverters
LTC1550LIGN Low Noise, Switched Capacitor Regulated Voltage Inverters
LTC1550LCMS8-4.1 Low Noise, Switched Capacitor Regulated Voltage Inverters
LTC1551LCMS8-4.1 Low Noise, Switched Capacitor Regulated Voltage Inverters
LTC1550LCS8-4.1 Low Noise, Switched Capacitor Regulated Voltage Inverters
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