LT1614CS8 Linear Technology, LT1614CS8 Datasheet - Page 9

• Manufacturer Part Number: LT1614CS8
• Description: IC SW REG INVERTING 600KHZ 8SOIC
• Manufacturer: Linear Technology
• Type: Invertingr

Specifications of LT1614CS8

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: Adj to -24V
• Current - Output: 500mA
• Frequency - Switching: 600kHz
• Voltage - Input: 0.92 ~ 5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

OPERATIO
I
I
LOAD
LOAD
AC COUPLED
Figure 10. Replacing C3 with 22 F Ceramic Capacitor
Lowers Output Voltage Ripple. 1nF Phase-Lead Capacitor
in Parallel with R1 Lowers Transient Excursion
AC COUPLED
100mV/DIV
100mV/DIV
200mA
200mA
50mA
50mA
V
V
OUT
OUT
Figure 8. Load Step Response of LT1614
with 33 F Tantalum Output Capacitor
U
Figure 12. Suggested Component Placement. Note: Cut in Ground Copper at D1’s Cathode
500 s/DIV
GND
500 s/DIV
R1
C3
SHUTDOWN
V
R2
OUT
R
C
C
C
L2
1614 F08
1614 F10
1
2
3
4
D1
C2
Figure 9. 33 F “B” Case Tantalum Capacitor Has ESR Resulting
in 40mV
C1
8
7
6
5
AC COUPLED
AC COUPLED
+
20mV/DIV
10mV/DIV
5V/DIV
5V/DIV
P-P
V
V
V
V
OUT
OUT
SW
SW
Voltage Ripple at Output with 200mA Load
Figure 11. 22 F Ceramic Capacitor at
Output Reduces Output Ripple Voltage
L1
1614 F12
V
IN
500ns/DIV
500ns/DIV
LT1614
1614 F09
1614 F11
9