LT1776CS8 Linear Technology, LT1776CS8 Datasheet - Page 6

• Manufacturer Part Number: LT1776CS8
• Description: IC SW REG STEP-DOWN HI-EFF 8SOIC
• Manufacturer: Linear Technology
• Type: Step-Down (Buck)r

Specifications of LT1776CS8

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 1.24 ~ 34 V
• Current - Output: 700mA
• Frequency - Switching: 200kHz
• Voltage - Input: 7.4 ~ 40 V
• Operating Temperature: 0°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

BLOCK DIAGRA
LT1776
PIN
10% and 90% duty cycle. The sync function is internally
disabled if the FB pin voltage is low enough to cause
oscillator slowdown. If unused, this pin should be grounded.
FB (Pin 7): This is the inverting input to the feedback
amplifier. The noninverting input of this amplifier is inter-
nally tied to the 1.24V reference. This pin also slows down
the frequency of the internal oscillator when its voltage is
6
U
SHDN
SYNC
GND
V
V
CC
FB
FUNCTIONS
C
2
1
6
4
8
7
U
V
BG
U
gm
BIAS
OSC
W
FB
AMP
V
B
BOOST
COMP
V
BG
V
LOGIC
TH
SWDR
SWDR
SWON
BOOST
SWOFF
I
R1
abnormally low, e.g., 2/3 of normal or less. This feature
helps maintain proper short-circuit protection.
V
output of the feedback amplifier and the input of the
current comparator. Frequency compensation of the over-
all loop is effected by placing a capacitor, (or in most cases
a series RC combination) between this node and ground.
C
BOOST
SWON
(Pin 8): This is the control voltage pin which is the
COMP
I
I
I
SWOFF
Q4
I
Q5
Q3
Q2
D1
Q1
R
SENSE
1776 BD
5
3
V
V
IN
SW