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LT1307IS8#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
1
LT1307/LT1307B
1307fa
Single Cell Micropower
600kHz PWM DC/DC Converters
The LT
®
1307/LT1307B are micropower, fixed frequency
DC/DC converters that operate from an input voltage as
low as 1V. First in the industry to achieve true current
mode PWM performance from a single cell supply, the
LT1307 features automatic shifting to power saving Burst
Mode operation at light loads. High efficiency is main-
tained over a broad 100µA to 100mA load range. The
LT1307B does not shift into Burst Mode operation at light
loads, eliminating low frequency output ripple at the
expense of light load efficiency. The devices contain a low-
battery detector with a 200mV reference and shut down to
less than 5µA. No load quiescent current of the LT1307 is
50µA and the internal NPN power switch handles a 500mA
current with a voltage drop of just 295mV.
Unlike competitive devices, large electrolytic capacitors
are
not required
with the LT1307/LT1307B in single cell
applications. The high frequency (600kHz) switching al-
lows the use of tiny surface mount multilayer ceramic
(MLC) capacitors along with small surface mount induc-
tors. The devices work with just 10µF of output capaci-
tance and require only 1µF of input bypassing.
The LT1307/LT1307B are available in 8-lead MSOP, PDIP
and SO packages.
■
Uses Small Ceramic Capacitors
■
50µA Quiescent Current (LT1307)
■
1mA Quiescent Current (LT1307B)
■
Operates with V
IN
as Low as 1V
■
600kHz Fixed Frequency Operation
■
Starts into Full Load
■
Low Shutdown Current: 3µA
■
Low-Battery Detector
■
3.3V at 75mA from a Single Cell
■
Automatic Burst Mode
®
Operation at
Light Load (LT1307)
■
Continuous Switching at Light Load (LT1307B)
■
Low V
CESAT
Switch: 295mV at 500mA
■
Pagers
■
Cordless Telephones
■
GPS Receivers
■
Battery Backup
■
Portable Electronic Equipment
■
Glucose Meters
■
Diagnostic Medical Instrumentation
Burst Mode is a registered trademark of Linear Technology Corporation.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Single Cell to 3.3V Converter Efficiency
LOAD CURRENT (mA)
0.1
70
EFFICIENCY (%)
80
90
1 10 100
1307 TA01
60
50
V
IN
= 1.5V
V
IN
= 1V
V
IN
= 1.25V
V
IN
SW
FB
LT1307
L1
10µH
D1
LBO
LBI
SHDNSHUTDOWN
100k
R2
604k
1%
3.3V
75mA
R1
1.02M
1%
680pF
FOR 5V OUTPUT: R1 = 1M, R2 = 329k
C1: MURATA-ERIE GRM235Y5V105Z01
MARCON THCS50E1E105Z
TOKIN 1E105ZY5U-C103-F
C2: MURATA-ERIE GRM235Y5V106Z01
MARCON THCS50E1E105Z
TOKIN 1E106ZY5U-C304-F
1307 F01
C1
1µF
C2
10µF
1.5V
CELL
V
C
GND
D1: MOTOROLA MBR0520L
L1: COILCRAFT D01608C-103
SUMIDA CD43-100
MURATA ERIE LQH3C100
Figure 1. Single Cell to 3.3V Boost Converter
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
2
LT1307/LT1307B
1307fa
V
IN
, SHDN, LBO Voltage ......................................... 12V
SW Voltage ............................................................. 30V
FB Voltage ....................................................... V
IN
+ 1V
V
C
Voltage ................................................................ 2V
LBI Voltage ............................................ 0V ≤ V
LBI
≤ 1V
Current into FB Pin .............................................. ±1mA
Junction Temperature...........................................125°C
Operating Temperature Range
Commercial (Note 2) ......................... –20°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
T
JMAX
= 125°C, θ
JA
= 160°C/W
ORDER PART
NUMBER
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
1
2
3
4
8
7
6
5
TOP VIEW
LBO
LBI
V
IN
SW
V
C
FB
SHDN
GND
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
LT1307CMS8
LT1307BCMS8
LT1307CN8
LT1307CS8
LT1307IS8
LT1307BCS8
LT1307BIS8
T
JMAX
= 125°C, θ
JA
= 100°C/W (N8)
T
JMAX
= 125°C, θ
JA
= 120°C/W (S8)
S8 PART MARKING
1307
1307B
1307I
1307BI
MS8 PART MARKING
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
Commercial Grade 0°C to 70°C. V
IN
= 1.1V, V
SHDN
= V
IN
, LT1307/LT1307B unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
Q
Quiescent Current Not Switching (LT1307) ● 50 90 µA
Not Switching (LT1307B)
● 1.0 1.5 mA
V
SHDN
= 0V ● 13µA
V
FB
Feedback Voltage ● 1.20 1.22 1.24 V
I
B
FB Pin Bias Current (Note 3) V
FB
= V
REF
● 27 60 nA
Reference Line Regulation 1V ≤ V
IN
≤ 2V (25°C, 0°C) 0.6 1.1 %/V
1V ≤ V
IN
≤ 2V (70°C) 1.5 %/V
2V ≤ V
IN
≤ 5V ● 0.3 0.8 %/V
Minimum Input Voltage 0.92 1 V
Input Voltage Range ● 15V
g
m
Error Amp Transconductance ∆I = 5µA ● 25 35 65 µmhos
A
V
Error Amp Voltage Gain 25°C, 0°C 35 100 V/V
70°C 30 V/V
f
OSC
Switching Frequency ● 550 600 750 kHz
LTIC
LTIB
Consult LTC Marketing for parts specified with wider operating temperature ranges.
(Note 1)
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
ELECTRICAL CHARACTERISTICS
3
LT1307/LT1307B
1307fa
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Maximum Duty Cycle 25°C, 0°C8084%
70°C76%
Switch Current Limit (Note 4) DC = 40% ● 0.6 1.25 A
DC = 75% 0.5 A
Switch V
CESAT
I
SW
= 500mA (25°C, 0°C) 295 350 mV
I
SW
= 500mA (70°C) 400 mV
Burst Mode Operation Switch Current Limit L = 10µH 100 mA
(LT1307 Only) L = 22µH50mA
Shutdown Pin Current V
SHDN
= V
IN
● 2.5 4.0 µA
V
SHDN
= 0V ● –1.5 –2.5 µA
LBI Threshold Voltage ● 190 200 210 mV
LBO Output Low I
SINK
= 10µA ● 0.1 0.25 V
LBO Leakage Current V
LBI
= 250mV, V
LBO
= 5V ● 0.01 0.1 µA
LBI Input Bias Current (Note 5) V
LBI
= 150mV ● 525nA
Low-Battery Detector Gain 1MΩ Load (25°C, 0°C) 1000 3000 V/V
1MΩ Load (70°C) 500 V/V
Switch Leakage Current V
SW
= 5V ● 0.01 3 µA
Reverse Battery Current (Note 6) 750 mA
Commercial Grade T
A
= – 20°C, V
IN
= 1.1V, V
SHDN
= V
IN
, unless otherwise noted (Note 2).
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
Q
Quiescent Current V
FB
= 1.3V, Not Switching (LT1307) 50 100 µA
V
FB
= 1.3V, Not Switching (LT1307B) 1.1 1.6 mA
V
SHDN
= 0V 1 3 µA
V
FB
Feedback Voltage 1.195 1.22 1.245 V
g
m
Error Amp Transconductance ∆I = 5µA253565µmhos
A
V
Error Amp Voltage Gain 35 100 V/V
f
OSC
Switching Frequency 500 600 750 kHz
Maximum Duty Cycle 80 84 %
Switch V
CESAT
I
SW
= 500mA, V
IN
= 1.2V 250 350 mV
Shutdown Pin Current V
SHDN
= V
IN
2.5 4.0 µA
V
SHDN
= 0V –1.5 –2.5 µA
LBI Threshold Voltage 186 200 210 mV
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
Commercial Grade 0°C to 70°C. V
IN
= 1.1V, V
SHDN
= V
IN
, LT1307/LT1307B unless otherwise noted.
ELECTRICAL CHARACTERISTICS
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LT1307IS8#PBF

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Buy LT1307IS8#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 1x Cell uP 600kHz PWM DC/DC Convs
Lifecycle:
New from this manufacturer.
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