LT1316 View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LT1316 Datasheet PDF : 16 Pages
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LT1316
PIN FUNCTIONS
LBO (Pin 1): Low-Battery Detector Output. Open collector
can sink up to 500µA. Low-battery detector remains active
in shutdown mode.
LBI (Pin 2): Low-Battery Detector Input. When voltage at
this pin drops below 1.17V, LBO goes low.
RSET (Pin 3): A resistor between RSET and GND programs
peak switch current. The resistor value should be between
3k and 150k. Do not float or short to ground. This is a high
impedance node. Keep traces at this pin as short as
possible. Do not put capacitance at this pin.
GND (Pin 4): Ground. Connect directly to ground plane.
SW (Pin 5): Collector of NPN Power Transistor. Keep
traces at this pin as short as possible.
VIN (Pin 6): Input Supply. Must be bypassed close to the
pin.
SHDN (Pin 7): Shutdown. Ground this pin to place the part
in shutdown mode (only the low-battery detector remains
active). Tie to a voltage between 1.4V and 6V to enable the
device. SHDN pin is logic level and need only meet the
logic specification (1.4V for high, 0.4V for low).
FB (Pin 8): Feedback Pin. Reference voltage is 1.23V.
Connect resistive divider tap here. Minimize trace area at
FB. Set VOUT according to: VOUT = 1.23V(1 + R1/R2).
BLOCK DIAGRA
L1
D1
VIN
LB0
VIN
SW
1
6
5
LBI 2
+
1.5V
A3
UNDERVOLTAGE
LOCKOUT
–
R3 = 10R4
R4
1.17V
+–
A2
C1
A1
0.5V
+
A4
–
3
RSET
R5
Q2
×1
Q1
×200
4
GND
DRIVER
OSCILLATOR
6.3µs ON
2µs OFF
7
SHDN
VOUT
R1
FB
8
R2
VREF
1.23V
1316 F01
Figure 1. LT1316 Block Diagram
5
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