LTC1550LCMS8-2#TRPBF Linear Technology, LTC1550LCMS8-2#TRPBF Datasheet - Page 10

• Manufacturer Part Number: LTC1550LCMS8-2#TRPBF
• Description: IC VOLT INV REGLTD SW-CAP 8-MSOP
• Manufacturer: Linear Technology
• Type: Switched Capacitor (Charge Pump), Invertingr

Specifications of LTC1550LCMS8-2#TRPBF

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: -2V
• Current - Output: 20mA
• Frequency - Switching: 900kHz
• Voltage - Input: 2.7 ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -

LTC1550L/LTC1551L
APPLICATIONS
Output Ripple vs Input Bypass Capacitor
The input bypass capacitor (C
significant impact on the output ripple. C
of the LTC1550L/LTC1551L’s supply current while it is
charging the flying capacitor (C1). Inadequate input
bypassing can cause the V
charge pump switches, causing the output linear regulator
to momentarily stop regulating. C
close to the LTC1550L/LTC1551L V
possible and its value should be significantly larger than
TYPICAL
10
APPLICATION
U
4.5V V
INFORMATION
U
CC
CC
+
IN
supply to dip when the
IN
) can also have a fairly
5.25V
U
C
2.2 F
should be mounted as
W
IN
Figure 7. Output Ripple vs Input Bypass Capacitance
CC
and GND pins as
IN
1
2
3
4
– 4.1V Output GaAs FET Bias Generator
SHDN
V
provides most
C1
V
CC
OUT
LTC1550L-4.1
8
7
6
5
4
3
2
1
0
+
0.1
0.1 F
U
V
T
C
C1
A
CC
OUT
= 25 C
CP
= 5V
= 10 F
GND
REG
OUT
C1
INPUT CAPACITANCE ( F)
–
6
5
8
7
1
C1. Surface mount tantalum or ceramic capacitors with
low ESR generally provide adequate performance. Figure 7
shows the LTC1550L/LTC1551L peak-to-peak output ripple
vs C
at 5mA. C
capacitor.
A 2.2 F surface mount ceramic capacitor at V
provides adequate output ripple performance for most
applications.
+
C
0.1 F
CP
C
10 F
IN
10
OUT
, taken using the test circuit in Figure 3 with I
– 4.1V BIAS
1550L/51L F08
OUT
C
0.1 F
100
L
is a 10 F in parallel with a 0.1 F ceramic
TRANSMITTER
GaAs
1550L/51L TA02
CC
generally
LOAD
set