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PDF LT1316IS8 Data sheet ( Hoja de datos )
| Número de pieza | LT1316IS8 | |
| Descripción | Micropower DC/DC Converter with Programmable Peak Current Limit | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LT1316
Micropower
DC/DC Converter
with Programmable
Peak Current Limit
FEATURES
s Precise Control of Peak Switch Current
s Quiescent Current:
33µA in Active Mode
3µA in Shutdown Mode
s Low-Battery Detector Active in Shutdown
s Low Switch VCESAT: 300mV at 500mA
s 8-Lead MSOP and SO Packages
s Operates with VIN as Low as 1.5V
s Logic Level Shutdown Pin
U
APPLICATIONS
s Battery Backup
s LCD Bias
s Low Power – 48V to 5V/3.3V Converters
DESCRIPTION
The LT®1316 is a micropower step-up DC/DC converter
that operates from an input voltage as low as 1.5V. A
programmable input current limiting function allows pre-
cise control of peak switch current. Peak switch current
can be set to any value between 30mA and 500mA by
adjusting one resistor. This is particularly useful for
DC/DC converters operating from high source impedance
inputs such as lithium coin cells or telephone lines.
The fixed off-time, variable on-time regulation scheme
results in quiescent current of only 33µA in active mode.
Quiescent current decreases to 3µA in shutdown with the
low-battery detector still active.
The LT1316 is available in 8-lead MSOP and SO packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
2-Cell to 5V Step-Up Converter
+
2 CELLS
L1
47µH
D1
6
VIN
7 SHDN
5
SW
8
FB
C1
47µF
2
NC LBI
LT1316
1
LBO NC
RSET
GND
34
R5
10k
1%
R1
1M
1%
+
R2
324k
1%
5V
50mA
C2
47µF
D1: MOTOROLA MBR0520L
L1: SUMIDA CD43-470
1316 TA01
Efficiency vs Load Current
90
3.3VIN
2.5VIN
80 1.8VIN
70
60
0.1
1 10
LOAD CURRENT (mA)
100
1316 TA02
1
1 page  
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
LB0
1
LBI 2
+
–
1.17V
A3
VIN
VIN
6
L1
1.5V
UNDERVOLTAGE
LOCKOUT
R3 = 10R4
+–
A2
SW
5
R4
D1
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
5 Page 
TYPICAL APPLICATIONS N
LT1316
– 48V
Nonisolated – 48V to 5V Flyback Converter
C2
0.022µF
Q3
2N3904
T1
10:1:1
D1
1N5817
32
L1 L3
41
+ C3
47µF
D2
1N4148
7
C1
0.1µF
R1
1.3M
R4
2M 6
7 VIN
SHDN
Q1
5
SW
R2
1.30M
1%
R3
604k
1%
1 LB0 LT1316
FB 8
2 LBI
RSET
GND
34
R5
69.8k
1%
L2 D3
6 1N4148
VA
+
C4
47µF
Q2 R7
MPSA92 432k, 1%
R6
121k
1%
VOUT
5V
50mA
T1 = DALE LPE-4841-A313 (605-665-9301)
L PRI: 2mH
R DS(ON): 4.3Ω AT VGS = 2.5V
R6, Q2,R7 MUST BE PLACED NEXT
TO THE FB PIN
IIN = 190µA WHEN
VIN = 48V, ILOAD = 1mA
1316 • TA03
Efficiency vs Load Current
90
80
36VIN
70
48VIN
60
72VIN
50
40
1
10
LOAD CURRENT (mA)
100
1316 TA04
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LT1316IS8.PDF ] | |
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