LT1576CS8-SYNC#TRPBF Linear Technology, LT1576CS8-SYNC#TRPBF Datasheet - Page 12
![IC SW REG STEP-DOWN 200KHZ 8SOIC](/photos/7/57/75766/lt1576cs8_sml.jpg)
LT1576CS8-SYNC#TRPBF
Manufacturer Part Number
LT1576CS8-SYNC#TRPBF
Description
IC SW REG STEP-DOWN 200KHZ 8SOIC
Manufacturer
Linear Technology
Type
Step-Down (Buck)r
Datasheet
1.LT1576CS8PBF.pdf
(28 pages)
Specifications of LT1576CS8-SYNC#TRPBF
Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
Adj to 1.2V
Current - Output
1.5A
Frequency - Switching
200kHz
Voltage - Input
5 ~ 25 V
Operating Temperature
0°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LT1576CS8-SYNC#TRPBFLT1576CS8-SYNC#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
LT1576/LT1576-5
APPLICATIONS
5. After making an initial choice, consider the secondary
Table 2
VENDOR/
PART NO.
Coiltronics
CTX15-2
CTX33-2
CTX68-4
CTX15-1P
CTX33-2P
CTX68-4P
Sumida
CDRH74-150
CDH115-330
CDRH125-680
CDH74-330
Coilcraft
DO3308P-153
DO3316P-333
DO3316P-683
Pulse
PE-53602
PE-53604
PE-53632
PE-53633
Gowanda
SMP3316-152K
SMP3316-332K
SMP3316-682K
Tor = Toroid
SC = Semi-closed geometry
Fer = Ferrite core material
52 = Type 52 powdered iron core material
KM = Kool M
12
things like output voltage ripple, second sourcing, etc.
Use the experts in the Linear Technology’s applica-
tions department if you feel uncertain about the final
choice. They have experience with a wide range of
inductor types and can tell you about the latest devel-
opments in low profile, surface mounting, etc.
VALUE
( H)
15
33
68
15
33
68
15
33
68
33
15
33
68
35
73
22
40
15
33
68
U
(Amps) TYPE TANCE( )
1.47
1.68
1.45
1.7
1.4
1.2
1.4
1.3
1.1
1.5
1.4
1.4
1.3
2.7
2.7
3.5
2.3
1.7
DC
2
2
INFORMATION
U
CORE
Tor
Tor
Tor
Tor
Tor
Tor
Tor
Tor
Tor
Tor
SC
SC
SC
SC
SC
SC
SC
SC
SC
SC
SERIES
RESIS-
0.059
0.106
0.158
0.087
0.126
0.238
0.081
0.082
0.166
0.290
0.063
0.085
0.041
0.092
0.178
W
0.12
0.17
0.12
0.18
0.1
MATER- HEIGHT
CORE
KM
KM
KM
IAL
Fer
Fer
Fer
Fer
Fer
Fer
Fer
Fer
Fer
Fer
Fer
Fer
Fer
Fer
52
52
52
U
(mm)
5.21
5.21
6.0
6.0
6.4
4.2
6.0
6.4
4.5
5.2
5.2
9.1
9.1
9.1
10
6
3
6
6
6
Output Capacitor
The output capacitor is normally chosen by its Effective
Series Resistance (ESR), because this is what determines
output ripple voltage. To get low ESR takes volume , so
physically smaller capacitors have high ESR. The ESR
range for typical LT1576 applications is 0.05 to 0.2 . A
typical output capacitor is an AVX type TPS, 100 F at 10V,
with a guaranteed ESR less than 0.1 . This is a “D” size
surface mount solid tantalum capacitor. TPS capacitors
are specially constructed and tested for low ESR, so they
give the lowest ESR for a given volume. The value in
microfarads is not particularly critical, and values from
22 F to greater than 500 F work well, but you cannot
cheat mother nature on ESR. If you find a tiny 22 F solid
tantalum capacitor, it will have high ESR, and output ripple
voltage will be terrible. Table 3 shows some typical solid
tantalum surface mount capacitors.
Table 3. Surface Mount Solid Tantalum Capacitor ESR
and Ripple Current
E Case Size
AVX TPS, Sprague 593D
AVX TAJ
D Case Size
AVX TPS, Sprague 593D
C Case Size
AVX TPS
Many engineers have heard that solid tantalum capacitors
are prone to failure if they undergo high surge currents.
This is historically true, and type TPS capacitors are
specially tested for surge capability, but surge ruggedness
is not a critical issue with the output capacitor. Solid
tantalum capacitors fail during very high turn-on surges,
which do not occur at the output of regulators. High
discharge surges, such as when the regulator output is
dead shorted, do not harm the capacitors.
Unlike the input capacitor, RMS ripple current in the
output capacitor is normally low enough that ripple cur-
rent rating is not an issue. The current waveform is
triangular with a typical value of 200mA
to calculate this is:
ESR (Max.,
0.1 to 0.3
0.7 to 0.9
0.1 to 0.3
0.2 (typ)
)
RMS
Ripple Current (A)
. The formula
0.7 to 1.1
0.7 to 1.1
0.5 (typ)
0.4