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LT1317CMS8#PBF

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1
LT1317/LT1317B
Micropower, 600kHz PWM
DC/DC Converters
DESCRIPTION
U
FEATURES
The LT
®
1317/LT1317B are micropower, fixed frequency
step-up DC/DC converters that operate over a wide input
voltage range of 1.5V to 12V. The LT1317 features auto-
matic shifting to power saving Burst Mode
TM
operation at
light loads. High efficiency is maintained over a broad
300µA to 200mA load range. Peak switch current during
Burst Mode operation is kept below 250mA for most
operating conditions which results in low output ripple
voltage, even at high input voltages. The LT1317B does
not shift into Burst Mode operation at light loads, eliminat-
ing low frequency output ripple at the expense of light load
efficiency.
The LT1317/LT1317B contain an internal low-battery de-
tector with a 200mV reference that stays alive when the
device goes into shutdown.
No-load quiescent current of the LT1317 is 100µA and
shuts down to 30µA. The internal NPN power switch
handles a 500mA current with a voltage drop of just
300mV.
The LT1317/LT1317B are available in MS8 and SO-8
packages.
■
100µA Quiescent Current
■
Operates with V
IN
as Low as 1.5V
■
600kHz Fixed Frequency Operation
■
Starts into Full Load
■
Low-Battery Detector Active in Shutdown
■
Automatic Burst Mode Operation at
Light Load (LT1317)
■
Continuous Switching at Light Loads (LT1317B)
■
Low V
CESAT
Switch: 300mV at 500mA
■
Pin for Pin Compatible with the LT1307/LT1307B
■
Cellular Telephones
■
Cordless Telephones
■
Pagers
■
GPS Receivers
■
Battery Backup
■
Portable Electronic Equipment
■
Glucose Meters
■
Diagnostic Medical Instrumentation
APPLICATIONS
U
Burst Mode is a trademark of Linear Technology Corporation.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
U
Figure 1. 2-Cell to 3.3V Boost Converter
V
IN
SW
FB
LT1317
L1
10µH
D1
LBO
LBI
SHDNSHUTDOWN
R
C
33k
R2*
604k
1%
3.3V
200mA
R1
1M
1%
C
C
3.3nF
1317 F01
C1
47µF
C2
47µF
2
CELLS
D1: MBR0520
L1: SUMIDA CD43-100
* FOR 5V OUTPUT, R2 = 332k, 1%
V
C
GND
+
+
2-Cell to 3.3V Converter Efficiency
LOAD CURRENT (mA)
50
EFFICIENCY (%)
60
70
80
90
0.3 10 100 1000
1317 TA01
40
1
3V
IN
1.65V
IN
2.2V
IN
2
LT1317/LT1317B
ORDER PART
NUMBER
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
V
IN
, LBO Voltage..................................................... 12V
SW Voltage ............................................... –0.4V to 30V
FB Voltage .................................................... V
IN
+ 0.3V
V
C
Voltage ................................................................ 2V
LBI Voltage ............................................ 0V ≤ V
LBI
≤ 1V
SHDN Voltage ............................................................ 6V
Junction Temperature.......................................... 125°C
Operating Temperature Range
Commercial ........................................... 0°C to 70°C
Industrial ............................................ –40°C to 85°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................ 300°C
WU
U
PACKAGE
/
O
RDER I FOR ATIO
ORDER PART
NUMBER
1
2
3
4
V
C
FB
SHDN
GND
8
7
6
5
LBO
LBI
V
IN
SW
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 125°C, θ
JA
= 160°C/W
1
2
3
4
8
7
6
5
TOP VIEW
LBO
LBI
V
IN
SW
V
C
FB
SHDN
GND
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 125°C, θ
JA
= 120°C/W
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
Q
Quiescent Current Not Switching, V
SHDN
= 2V (LT1317) ● 100 160 µA
V
SHDN
= 0V (LT1317/LT1317B) ● 25 40 µA
V
SHDN
= 2V, Switching (LT1317B) 4.8 6.5 mA
V
SHDN
= 2V, Switching (LT1317B) ● 7.5 mA
V
FB
Feedback Voltage 1.22 1.24 1.26 V
● 1.20 1.24 1.26 V
I
B
FB Pin Bias Current (Note 2) ● 12 60 nA
Input Voltage Range ● 1.5 12 V
g
m
Error Amp Transconductance ∆I = 5µA ● 70 140 240 µmhos
A
V
Error Amp Voltage Gain 700 V/V
Maximum Duty Cycle ● 80 85 %
Switch Current Limit (Note 3) V
IN
= 2.5V, Duty Cycle = 30% 710 800 1300 mA
V
IN
= 2.5V, Duty Cycle = 30% ● 660 1350 mA
Burst Mode Operation Switch Current Limit Duty Cycle = 30% (LT1317) 275 mA
f
OSC
Switching Frequency ● 520 620 720 kHz
E
LECTR
IC
AL C CHARA TERIST
ICS
Commercial Grade V
IN
= 2V, V
SHDN
= 2V, T
A
= 25°C, unless otherwise noted.
Consult factory for Military grade parts.
MS8 PART MARKING S8 PART MARKING
LT1317CS8
LT1317BCS8
LT1317IS8
LT1317BIS8
1317
1317B
1317I
1317BI
LTHA
LTHB
LT1317CMS8
LT1317BCMS8
(Note 1)
3
LT1317/LT1317B
E
LECTR
IC
AL C CHARA TERIST
ICS
Commercial Grade V
IN
= 2V, V
SHDN
= 2V, T
A
= 25°C unless otherwise noted.
Industrial Grade V
IN
= 2V, V
SHDN
= 2V, –40°C ≤ T
A
≤ 85°C unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
Q
Quiescent Current Not Switching, V
SHDN
= 2V (LT1317) ● 160 µA
V
SHDN
= 0V (LT1317/LT1317B) ● 40 µA
V
SHDN
= 2V, Switching (LT1317B) ● 7.5 mA
V
FB
Feedback Voltage ● 1.20 1.26 V
I
B
FB Pin Bias Current (Note 2) ● 80 nA
Input Voltage Range ● 1.7 12 V
g
m
Error Amp Transconductance ∆I = 5µA ● 70 140 240 µmhos
Maximum Duty Cycle ● 80 %
Switch Current Limit (Note 3) V
IN
= 2.5V, Duty Cycle = 30% ● 550 1350 mA
f
OSC
Switching Frequency ● 500 750 kHz
Shutdown Pin Current V
SHDN
= V
IN
● 0.1 µA
V
SHDN
= 0V ● –7 µA
LBI Threshold Voltage ● 180 220 mV
LBO Output Low I
SINK
= 10µA ● 0.25 V
LBO Leakage Current V
LBI
= 250mV, V
LBO
= 5V ● 0.1 µA
LBI Input Bias Current (Note 4) V
LBI
= 150mV ● 60 nA
Switch Leakage Current V
SW
= 5V ● 3 µA
Switch V
CE
Sat I
SW
= 500mA ● 400 mV
Reference Line Regulation 1.8V ≤ V
IN
≤ 12V ● 0.15 %/V
SHDN Input Voltage High ● 1.4 6 V
SHDN Input Voltage Low ● 0.4 V
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Shutdown Pin Current V
SHDN
= V
IN
● 0.015 0.06 µA
V
SHDN
= 0V ● –2.3 –6 µA
LBI Threshold Voltage 190 200 210 mV
● 180 200 220 mV
LBO Output Low I
SINK
= 10µA ● 0.15 0.25 V
LBO Leakage Current V
LBI
= 250mV, V
LBO
= 5V ● 0.02 0.1 µA
LBI Input Bias Current (Note 4) V
LBI
= 150mV ● 540nA
Low-Battery Detector Gain 1MΩ Load 2000 V/V
Switch Leakage Current V
SW
= 5V ● 0.01 3 µA
Switch V
CE
Sat I
SW
= 500mA 300 350 mV
● 400 mV
Reference Line Regulation 1.8V ≤ V
IN
≤ 12V ● 0.08 0.15 %/V
SHDN Input Voltage High ● 1.4 6 V
SHDN Input Voltage Low ● 0.4 V
Note 2: Bias current flows into FB pin.
Note 3: Switch current limit guaranteed by design and/or correlation to
static tests. Duty cycle affects current limit due to ramp generator.
Note 4: Bias current flows out of LBI pin.
The ● denotes specifications which apply over the full operating
temperature range.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
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LT1317CMS8#PBF

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Buy LT1317CMS8#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Micropower, 600kHz PWM DC/DC Converters
Lifecycle:
New from this manufacturer.
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