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LT1173CS8-12#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LT1173
1
Micropower
DC/DC Converter
Adjustable and Fixed 5V, 12V
V
OUT
5V/DIV
0V
PROGRAM
5V/DIV
5ms/DIV
1173 TA02
L1*
100µH
LT1173 • TA01
+
GND SW2
FB
SW1
LIM
I
IN
V
LT1173
10 F
SANYO
OS-CON
100 F
µ
12V
100mA
1N5818
µ
+
5V
IN
1N4148
PROGRAM
47Ω
*L1 = GOWANDA GA20-103K
COILTRONICS CTX100-4
1.07M
†
124k
†
NO OVERSHOOT
EFFICIENCY = 81%
†
= 1% METAL FILM
Logic Controlled Flash Memory VPP Generator
VPP Output
D
U
ESCRIPTIO
S
F
EA
T
U
RE
U
S
A
O
PP
L
IC
AT
I
and LTC are registered trademarks and LT is a trademark of Linear Technology Corporation.
■
Operates at Supply Voltages From 2.0V to 30V
■
Consumes Only 110µA Supply Current
■
Works in Step-Up or Step-Down Mode
■
Only Three External Components Required
■
Low Battery Detector Comparator On-Chip
■
User-Adjustable Current Limit
■
Internal 1A Power Switch
■
Fixed or Adjustable Output Voltage Versions
■
Space Saving 8-Pin MiniDIP or SO8 Package
The LT1173 is a versatile micropower DC-DC converter.
The device requires only three external components to
deliver a fixed output of 5V or 12V. Supply voltage ranges
from 2.0V to 12V in step-up mode and to 30V in step-down
mode. The LT1173 functions equally well in step-up, step-
down or inverting applications.
The LT1173 consumes just 110µA supply current at
standby, making it ideal for applications where low quies-
cent current is important. The device can deliver 5V at
80mA from a 3V input in step-up mode or 5V at 200mA
from a 12V input in step-down mode.
Switch current limit can be programmed with a single
resistor. An auxiliary gain block can be configured as a low
battery detector, linear post regulator, under voltage lock-
out circuit or error amplifier.
For input sources of less than 2V, use the LT1073.
■
Flash Memory Vpp Generators
■
3V to 5V, 5V to 12V Converters
■
9V to 5V, 12V to 5V Converters
■
LCD Bias Generators
■
Peripherals and Add-On Cards
■
Battery Backup Supplies
■
Laptop and Palmtop Computers
■
Cellular Telephones
■
Portable Instruments
U
SA
O
PP
L
IC
AT
ITY
P
I
CA
L
LT1173
2
WU
U
PACKAGE
/
O
RDER I FOR ATIO
LT1173CN8
LT1173CN8-5
LT1173CN8-12
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
Supply Voltage (V
IN
)................................................ 36V
SW1 Pin Voltage (V
SW1
) .......................................... 50V
SW2 Pin Voltage (V
SW2
) .............................–0.5V to V
IN
Feedback Pin Voltage (LT1173) ................................. 5V
Sense Pin Voltage (LT1173, -5, -12) ....................... 36V
Maximum Power Dissipation ............................. 500mW
Maximum Switch Current ....................................... 1.5A
Operating Temperature Range ..................... 0°C to 70°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature, (Soldering, 10 sec.)................300°C
Consult factory for Industrial and Military grade parts
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
Q
Quiescent Current Switch Off ● 110 150 µA
I
Q
Quiescent Current, Boost No Load LT1173-5 135 µA
Mode Configuration
LT1173-12 250 µA
V
IN
Input Voltage Step-Up Mode ● 2.0 12.6 V
Step-Down Mode ● 30 V
Comparator Trip Point Voltage LT1173 (Note 1) ● 1.20 1.245 1.30 V
V
OUT
Output Sense Voltage LT1173-5 (Note 2) ● 4.75 5.00 5.25 V
LT1173-12 (Note 2) ● 11.4 12.0 12.6 V
Comparator Hysteresis LT1173 ● 510 mV
Output Hysteresis LT1173-5 ● 20 40 mV
LT1173-12 ● 50 100 mV
f
OSC
Oscillator Frequency ● 18 23 30 kHz
Duty Cycle Full Load ● 43 51 59 %
t
ON
Switch ON Time I
LIM
tied to V
IN
● 17 22 32 µs
Feedback Pin Bias Current LT1173, V
FB
= 0V ● 10 50 nA
Set Pin Bias Current V
SET
= V
REF
● 20 100 nA
V
OL
Gain Block Output Low I
SINK
= 100µA, V
SET
= 1.00V ● 0.15 0.4 V
Reference Line Regulation 2.0V ≤ V
IN
≤ 5V ● 0.2 0.4 %/V
5V ≤ V
IN
≤ 30V ● 0.02 0.075 %/V
V
SAT
SW
SAT
Voltage, Step-Up Mode V
IN
= 3.0V, I
SW
= 650mA ● 0.5 0.65 V
V
IN
= 5.0V, I
SW
= 1A 0.8 1.0 V
● 1.4 V
T
A
= 25°C, V
IN
= 3V, unless otherwise noted.
E
LECTR
IC
AL C CHARA TERIST
ICS
1
2
3
4
8
7
6
5
TOP VIEW
I
LIM
V
IN
SW1
SW2
FB (SENSE)*
SET
AO
GND
N8 PACKAGE
8-LEAD PLASTIC DIP
*FIXED VERSIONS
T
JMAX
= 90°C, θ
JA
= 130°C/W
TOP VIEW
S8 PACKAGE
8-LEAD PLASTIC SOIC
*FIXED VERSIONS
1
2
3
4
8
7
6
5
I
LIM
V
IN
SW1
SW2
FB (SENSE)*
SET
AO
GND
T
JMAX
= 90°C, θ
JA
= 150°C/W
LT1173CS8
LT1173CS8-5
LT1173CS8-12
ORDER PART
NUMBER
S8 PART MARKING
1173
11735
117312
LT1173
3
V
SAT
SW
SAT
Voltage, Step-Down Mode V
IN
= 12V, I
SW
= 650mA 1.1 1.5 V
● 1.7 V
A
V
Gain Block Gain R
L
= 100kΩ (Note 3) ● 400 1000 V/V
Current Limit 220Ω to I
LIM
to V
IN
400 mA
Current Limit Temperature Coeff. ● –0.3 %/°C
Switch OFF Leakage Current Measured at SW1 Pin 1 10 µA
V
SW2
Maximum Excursion Below GND I
SW1
≤ 10µA, Switch Off –400 –350 mV
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Note 2: The output voltage waveform will exhibit a sawtooth shape due to
the comparator hysteresis. The output voltage on the fixed output versions
will always be within the specified range.
Note 3: 100kΩ resistor connected between a 5V source and the AO pin.
The ● denotes the specifications which apply over the full operating
temperature range.
Note 1: This specification guarantees that both the high and low trip points
of the comparator fall within the 1.20V to 1.30V range.
E
LECTR
IC
AL C CHARA TERIST
ICS
T
A
= 25°C, V
IN
= 3V, unless otherwise noted.
Maximum Switch Current vs Set Pin Bias Current vs Feedback Pin Bias Current vs
R
LIM
Step-Down Mode Temperature Temperature
CCHARA TERIST
ICS
UW
AT
Y
P
I
CA
LPER
F
O
R
C
E
I (A)
0
0
V (V)
0.2
0.4
0.6
1.0
1.2
0.2 0.4 0.6 0.8
LT1173 • TPC01
0.8
1.0 1.2
SWITCH
CESAT
V = 5.0V
IN
V = 3.0V
IN
V = 2.0V
IN
I (A)
0
0.7
SWITCH ON VOLTAGE (V)
0.8
0.9
1.1
1.3
1.4
0.1 0.2 0.3 0.4
LT1173 • TPC02
1.2
0.5 0.6
SWITCH
0.7 0.8
1.0
Switch ON Voltage
Saturation Voltage Step-Up Mode Step-Down Mode Maximum Switch Current vs
(SW2 Pin Grounded) (SW1 Pin Connected to V
IN
)R
LIM
Step-Up Mode
TEMPERATURE (°C)
–50
SET PIN BIAS CURRENT (nA)
10
15
20
–25 0 25 50
LT1173 •TPC04
75
100
125
V = 3V
IN
5
TEMPERATURE (°C)
–50
FEEDBACK PIN BIAS CURRENT ( A)
14
16
18
–25 0 25 50
LT1173 •TPC05
75
100
125
V = 3V
IN
µ
12
10
8
R ( )
100
0
SWITCH CURRENT (mA)
400
800
1000
LT1173 • TPC09
Ω
900
700
600
500
300
200
LIM
1000
V
OUT
= 5V
100
V
IN
= 24V
L = 500µH
V
IN
= 12V
L = 250µH
R ( )
10
100
SWITCH CURRENT (mA)
400
800
1200
100
LT1173 • TPC03
Ω
1000
900
700
600
500
300
200
LIM
1000
1100
2V ≤ V
IN
≤ 5V
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LT1173CS8-12#PBF

Mfr. #:
Buy LT1173CS8-12#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Micropower DC/DC Converter Adjustable and Fixed 5V, 12V
Lifecycle:
New from this manufacturer.
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