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LT3473EDD#PBF

P1-P3P4-P6P7-P9P10-P12
1
LT3473/LT3473A
3473f
■
OLED Bias
■
CCD Bias
Conversion Efficiency and Power Loss vs Output Current
Micropower 1A Boost
Converter with Schottky
and Output Disconnect
■
Tiny Solution Size
■
Low Quiescent Current:
150µA in Active Mode (V
IN
= 3.6V, V
OUT
= 15V,
No Load)
1µA in Shutdown Mode
■
Internal 1A, 36V Switch
■
Integrated Schottky Diode
■
Integrated PNP Output Disconnect
■
Internal Reference Override Pin
■
PGOOD Pin
■
25V at 80mA from 3.6V Input
■
Auxiliary NPNs for Intermediate
Bias Voltages (LT3473A)
■
Automatic Burst Mode
®
Operation at Light Load
■
Constant Switching Frequency: 1.2MHz
■
Thermal Shutdown
■
Input Range: 2.2V to 16V
■
Low Profile (3mm × 3mm) DFN Package (LT3473)
■
Low Profile (4mm × 3mm) DFN Package (LT3473A)
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
The LT
®
3473/LT3473A are micropower step-up DC/DC
converters with integrated Schottky diode and output
disconnect circuitry in low profile DFN packages. The
small package size, high level of integration and the use of
tiny SMT components yield a solution size of less than
50mm
2
. The internal 1A switch allows the device to deliver
25V at up to 80mA from a Li-Ion cell, while automatic Burst
Mode operation maintains efficiency at light load. An
auxiliary reference input (CTRL) allows the user to over-
ride the internal 1.25V feedback reference with any lower
value, allowing full control of the output voltage during
operation. A PGOOD pin sinks current when the output
voltage reaches 90% of final value.
The LT3473A includes two NPN transistors for generating
intermediate bias voltages from the output and is offered
in a 12-lead (4mm × 3mm) DFN package. The LT3473
does not include these NPNs and is offered in an 8-lead
(3mm × 3mm) package.
The rugged 36V switch and output disconnect circuitry
allow outputs up to 34V to be easily generated in a simple
boost topology.
2.2µF
V
OUT
25V
80mA
3473 TA01a
4.7µF
0.47µF
V
IN
3V TO 4.2V
2M
100k
LT3473
GND
6.8µH
PGOOD
CTRL
SW
V
IN
SHDN
OUT
CAP
FB
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
OUTPUT CURRENT (mA)
0.1
EFFICIENCY (%)
POWER LOSS (mW)
65
70
3473 TA01b
60
55
1
10
100
80
200
100
400
300
0
500
75
V
IN
= 3.6V
V
OUT
= 15V
2
LT3473/LT3473A
3473f
V
IN
Voltage ............................................................. 16V
SHDN Voltage .......................................................... 16V
SW Voltage ............................................................. 36V
PGOOD Voltage ...................................................... 36V
CAP Voltage ............................................................ 36V
OUT Voltage ........................................................... 36V
FB Voltage .............................................................. 10V
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
(Note 1)
LT3473AEDE
ORDER PART
NUMBER
DE PART MARKING
3473A
T
JMAX
= 125°C, θ
JA
= 43°C/ W
EXPOSED PAD (PIN 13) IS GND
MUST BE SOLDERED TO PCB (NOTE 3)
12
11
10
9
8
7
1
2
3
4
5
6
SW
V
IN
SHDN
PGOOD
CTRL
FB
CAP
OUT
NB1
NE1
NB2
NE2
TOP VIEW
13
DE PACKAGE
12-LEAD (4mm × 3mm) PLASTIC DFN
CTRL Voltage .......................................................... 10V
NB1, NB2 Voltage ................................................... 36V
NE1, NE2 Voltage ................................................... 36V
Maximum Junction Temperature ......................... 125°C
Operating Temperature Range (Note 2) .. –40°C to 85°C
Storage Temperature Range ................ – 65°C to 125°C
LT3473EDD
ORDER PART
NUMBER
DD PART MARKING
LBJJ
TOP VIEW
9
DD PACKAGE
8-LEAD (3mm × 3mm) PLASTIC DFN
5
6
7
8
4
3
2
1CAP
OUT
CTRL
FB
SW
V
IN
SHDN
PGOOD
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Operation Voltage 2.2 V
Maximum Operation Voltage 16 V
Supply Current SHDN = 3V, Not Switching 100 µA
SHDN = 0V 0.1 1 µA
SHDN Voltage to Enable Chip ● 1.4 V
SHDN Voltage to Disable Chip ● 0.2 V
SHDN Pin Bias Current 2 µA
FB Voltage ● 1.235 1.25 1.26 V
FB Voltage Line Regulation 3V < V
IN
< 16V 0.01 %/V
FB Pin Bias Current FB = 1.27V 20 nA
CTRL to FB Offset CTRL = 0.5V 5 20 mV
CTRL Pin Bias Current CTRL = 1V 50 nA
FB Threshold for PGOOD CTRL = 2V 1.15 V
CTRL = 0.5V 0.40 V
PGOOD Current Capacity ● 100 µA
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25°C.
V
IN
= 3V, SHDN = 3V, CTRL = 2V, unless otherwise specified.
ELECTRICAL CHARACTERISTICS
T
JMAX
= 125°C, θ
JA
= 43°C/ W
EXPOSED PAD (PIN 9) IS GND
MUST BE SOLDERED TO PCB (NOTE 3)
3
LT3473/LT3473A
3473f
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25°C.
V
IN
= 3V, SHDN = 3V, CTRL = 2V, unless otherwise specified.
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT3473EDD and LT3473AEDE are guaranteed to meet
performance specifications from 0°C to 70°C. Specifications over the
–40°C to 85°C operating temperature range are assured by design,
characterization and correlation with statistical process controls.
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Load Regulation (Feedback Taken
from CAP)
LOAD CURRENT (mA)
0
19.00
VOLTAGE (V)
19.20
19.40
19.60
19.80
CAP
OUT
20.00
20.20
20 40 60 80
3473 G01
100
V
IN
= 3.6V
CTRL VOLTAGE (V)
0
0
FEEDBACK VOLTAGE (V)
0.2
0.6
0.8
1.0
1.4
0.2
1
1.4
3473 G02
0.4
1.2
0.8
1.8
2
0.4
0.6
1.2 1.6
CTRL VOLTAGE (V)
0
1.0
1.2
1.4
2
3473 G03
0.8
0.6
0.5 1 1.5
0.4
0.2
0
PGOOD THRESHOLD VOLTAGE (V)
Feedback Voltage PGOOD Threshold Voltage
PARAMETER CONDITIONS MIN TYP MAX UNITS
Switching Frequency 0.9 1.2 1.4 MHz
Maximum Duty Cycle ● 88 92 %
Switch Current Limit ● 1.2 A
Switch V
CESAT
I
SW
= 100mA 45 mV
Switch Leakage Current V
SW
= 5V 0.1 5 µA
Schottky Forward Drop I
D
= 100mA 0.45 V
Schottky Leakage Current CAP = 36V, SW = 0V 4 µA
Disconnect PNP Voltage Drop I
OUT
= 100µA, CAP = 20V 80 mV
I
OUT
= 50mA, CAP = 20V 250 mV
Disconnect PNP Quiescent Current CAP = 20V 1.2 µA
Disconnect PNP Leakage Current SHDN = OUT = 0V, CAP = 20V 0.01 0.1 µA
LTC3473A Only
NPN1 Voltage Drop INE1 = 1mA 0.8 V
NPN1 Beta INE1 = 1mA 60
NPN2 Voltage Drop INE2 = 1mA 0.8 V
NPN2 Beta INE2 = 1mA 60
Note 3: Failure to correctly solder the Exposed Pad of the package to the
PC board will result in a thermal resistance much higher than 40°C.
T
A
= 25°C unless otherwise noted.
P1-P3P4-P6P7-P9P10-P12

LT3473EDD#PBF

Mfr. #:
Buy LT3473EDD#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 1.2A, 1.2MHz Boost DC/DC Converter in DFN
Lifecycle:
New from this manufacturer.
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