LT1307BIS8#PBF Linear Technology, LT1307BIS8#PBF Datasheet - Page 7

• Manufacturer Part Number: LT1307BIS8#PBF
• Description: IC DC/DC CONV SINGLE CELL 8-SOIC
• Manufacturer: Linear Technology
• Type: Step-Up (Boost)r

Specifications of LT1307BIS8#PBF

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 3.3V, 5V
• Current - Output: 100mA
• Frequency - Switching: 600kHz
• Voltage - Input: 1 ~ 5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -

BLOCK DIAGRA
PI FU CTIO S
V
nect a series RC from this pin to ground. Typical values
are 100k and 680pF. Minimize trace area at V
FB (Pin 2): Feedback Pin. Reference voltage is 1.22V.
Connect resistor divider tap here. Minimize trace area at
FB. Set V
SHDN (Pin 3): Shutdown. Ground this pin to turn off
switcher. Must be tied to V
switcher. Do not float the SHDN pin.
GND (Pin 4): Ground. Connect directly to local ground
plane.
C
U
(Pin 1): Compensation Pin for Error Amplifier. Con-
V
OUT
OUT
R1
(EXTERNAL)
R2
(EXTERNAL)
U
FB
according to: V
U
V
FB
6
2
IN
W
IN
Q1
(or higher voltage) to enable
R5
40k
OUT
= 1.22V(1 + R1/R2).
Q2
R6
40k
R3
30k
R4
140k
10
Figure 2. LT1307/LT1307B Block Diagram
V
*HYSTERESIS IN LT1307 ONLY
IN
–
+
OSCILLATOR
GENERATOR
600kHz
RAMP
g
AMPLIFIER
m
ERROR
C
.
+
+
BIAS
SW (Pin 5): Switch Pin. Connect inductor/diode here.
Minimize trace area at this pin to keep EMI down.
V
capacitor right at the pin, connected directly to ground.
LBI (Pin 7): Low-Battery Detector Input. 200mV refer-
ence. Voltage on LBI must stay between ground and
700mV.
LBO (Pin 8): Low-Battery Detector Output. Open collec-
tor, can sink 10 A. A 1M pull-up is recommended.
IN
(Pin 6): Supply Pin. Must have 1 F ceramic bypass
V
+
–
–
+
1
C
COMPARATOR
*
A1
A2
ENABLE
200mV
R
FF
S
LBI
7
Q
+
–
LT1307/LT1307B
SHUTDOWN
DRIVER
A = 3
A4
+
–
SHDN
GND
LBO
SW
3
8
5
4
Q3
0.15
1307 F02
1307fa
7