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LT1110CN8#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LT1110
1
D
U
ESCRIPTIO
The LT1110 is a versatile micropower DC-DC converter.
The device requires only three external components to
deliver a fixed output of 5V or 12V. The very low minimum
supply voltage of 1.0V allows the use of the LT1110 in
applications where the primary power source is a single
cell. An on-chip auxiliary gain block can function as a low
battery detector or linear post regulator.
The 70kHz oscillator allows the use of surface mount
inductors and capacitors in many applications. Quiescent
current is just 300µA, making the device ideal in remote or
battery powered applications where current consumption
must be kept to a minimum.
The device can easily be configured as a step-up or
step-down converter, although for most step-down
applications or input sources greater than 3V, the LT1111
is recommended. Switch current limiting is user-adjustable
by adding a single external resistor. Unique reverse battery
protection circuitry limits reverse current to safe, non-
destructive levels at reverse supply voltages up to 1.6V.
S
F
EA
T
U
RE
■
Operates at Supply Voltages From 1.0V to 30V
■
Works in Step-Up or Step-Down Mode
■
Only Three External Off-the-Shelf 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 S8 Package
U
S
A
O
PP
L
IC
AT
I
■
Pagers
■
Cameras
■
Single-Cell to 5V Converters
■
Battery Backup Supplies
■
Laptop and Palmtop Computers
■
Cellular Telephones
■
Portable Instruments
■
Laser Diode Drivers
■
Hand-Held Inventory Computers
Micropower
DC-DC Converter
Adjustable and Fixed 5V, 12V
LOAD CURRENT (mA)
0
EFFICIENCY (%)
50
60
70
80
85
90
10 20 30 40
LT1110 • TA02
75
65
55
5152535
V
IN
= 1.50V
V
IN
= 1.25V
V
IN
= 1.00V
U
A
O
PP
L
IC
AT
ITY
P
I
CA
L
Efficiency
All Surface Mount
Single Cell to 5V Converter
LT1110 • TA01
+
GND SW2
SENSE
SW1
LIM
I
IN
V
54
1
3
8
LT1110-5
1.5V
AA CELL*
*ADD 10 F DECOUPLING CAPACITOR IF BATTERY
IS MORE THAN 2" AWAY FROM LT1110.
µ
15µF
TANTALUM
5V
MBRS120T3
SUMIDA
CD54-470K
47µH
OPERATES WITH CELL VOLTAGE 1.0V
≥
2
LT1110
2
WU
U
PACKAGE
/
O
RDER I FOR ATIO
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
Supply Voltage, Step-Up Mode................................ 15V
Supply Voltage, Step-Down Mode ........................... 36V
SW1 Pin Voltage...................................................... 50V
SW2 Pin Voltage.........................................–0.5V to V
IN
Feedback Pin Voltage (LT1110) .............................. 5.5V
Switch Current........................................................ 1.5A
Maximum Power Dissipation ............................. 500mW
Operating Temperature Range ..................... 0°C to 70°C
Storage Temperature Range ..................–65°C to 150°C
Lead Temperature (Soldering, 10 sec.)................. 300°C
ORDER PART
NUMBER
LT1110CN8
LT1110CN8-5
LT1110CN8-12
1110
11105
11012
Consult factory for Industrial and Military grade parts.
T
JMAX
= 90°C, θ
JA
= 150°C/W
1
2
3
4
8
7
6
5
TOP VIEW
I
LIM
V
IN
SW1
SW2
FB (SENSE)*
SET
A0
GND
N8 PACKAGE
8-LEAD PLASTIC DIP
*FIXED VERSIONS
T
JMAX
= 90°C, θ
JA
= 130°C/W
1
2
3
4
8
7
6
5
TOP VIEW
FB (SENSE)*
SET
A0
GND
I
LIM
V
IN
SW1
SW2
S8 PACKAGE
8-LEAD PLASTIC SOIC
*FIXED VERSIONS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
Q
Quiescent Current Switch Off ● 300 µA
V
IN
Input Voltage Step-Up Mode ● 1.15 12.6 V
1.0 12.6 V
Step-Down Mode ● 30 V
Comparator Trip Point Voltage LT1110 (Note 1) ● 210 220 230 mV
V
OUT
Output Sense Voltage LT1110-5 (Note 2) ● 4.75 5.00 5.25 V
LT1110-12 (Note 2) ● 11.4 12.00 12.6 V
Comparator Hysteresis LT1110 ● 48 mV
Output Hysteresis LT1110-5 ● 90 180 mV
LT1110-12 ● 200 400 mV
f
OSC
Oscillator Frequency ● 52 70 90 kHz
DC Duty Cycle Full Load (V
FB
< V
REF
) ● 62 69 78 %
t
ON
Switch ON Time ● 7.5 10 12.5 µs
I
FB
Feedback Pin Bias Current LT1110, V
FB
= 0V ● 70 150 nA
I
SET
Set Pin Bias Current V
SET
= V
REF
● 100 300 nA
V
AO
AO Output Low I
AO
= –300µA, V
SET
= 150mV ● 0.15 0.4 V
Reference Line Regulation 1.0V ≤ V
IN
≤ 1.5V ● 0.35 1.0 %/V
1.5V ≤ V
IN
≤ 12V ● 0.05 0.1 %/V
E
LECTR
IC
AL C CHARA TERIST
ICS
T
A
= 25°C, V
IN
= 1.5V, unless otherwise noted.
S8 PART MARKING
LT1110CS8
LT1110CS8-5
LT1110CS8-12
LT1110
3
V
CESAT
Switch Saturation Voltage V
IN
= 1.5V, I
SW
= 400mA 300 400 mV
Step-Up Mode ● 600 mV
V
IN
= 1.5V, I
SW
= 500mA 400 550 mV
● 750 mV
V
IN
= 5V, I
SW
= 1A 700 1000 mV
A
V
A2 Error Amp Gain R
L
= 100kΩ (Note 3) ● 1000 5000 V/V
I
REV
Reverse Battery Current (Note 4) 750 mA
I
LIM
Current Limit 220Ω Between I
LIM
and V
IN
400 mA
Current Limit Temperature – 0.3 %/°C
Coefficient
I
LEAK
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
E
LECTR
IC
AL C CHARA TERIST
ICS
T
A
= 25°C, V
IN
= 1.5V, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Note 3: 100kΩ resistor connected between a 5V source and the AO pin.
Note 4: The LT1110 is guaranteed to withstand continuous application of
+1.6V applied to the GND and SW2 pins while V
IN
, I
LIM
, and SW1 pins are
grounded.
The ● denotes the specifications which apply over the full operating
temperature range.
Note 1: This specification guarantees that both the high and low trip point
of the comparator fall within the 210mV to 230mV range.
Note 2: This specification guarantees that the output voltage of the fixed
versions will always fall within the specified range. The waveform at the
sense pin will exhibit a sawtooth shape due to the comparator hysteresis.
CCHARA TERIST
ICS
UW
AT
Y
P
I
CA
LPER
F
O
R
C
E
Oscillator Frequency Oscillator Frequency Switch On Time
INPUT VOLTAGE (V)
0
64
FREQUENCY (KHz)
66
70
72
74
78
80
36
912
LT1110 • TPC02
15 18 21
62
60
24
27
30
68
76
TEMPERATURE (°C)
ON TIME (µs)
–50 –25 0 25
LT1110 • TPC03
50 75 100
14
13
12
11
10
9
8
7
TEMPERATURE (°C)
–50
40
OSCILLATOR FREQUENCY (KHz)
50
60
70
80
90
100
–25 0
25
50
LT1110 • TPC01
75
100
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LT1110CN8#PBF

Mfr. #:
Buy LT1110CN8#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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