LT3473EDD#PBF Linear Technology, LT3473EDD#PBF Datasheet

IC CONV DC/DC 1A 8-DFN

LT3473EDD#PBF

Manufacturer Part Number
LT3473EDD#PBF
Description
IC CONV DC/DC 1A 8-DFN
Manufacturer
Linear Technology
Type
Step-Up (Boost)r
Datasheet

Specifications of LT3473EDD#PBF

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
Adj to 34V
Current - Output
1A
Frequency - Switching
1.2MHz
Voltage - Input
2.2 ~ 16 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-DFN
Power - Output
80mA
Primary Input Voltage
16V
No. Of Outputs
1
Output Voltage
34V
Output Current
1.2A
No. Of Pins
8
Operating Temperature Range
-40°C To +85°C
Msl
MSL 1 - Unlimited
Rohs Compliant
Yes
Dc To Dc Converter Type
Step Up
Pin Count
8
Input Voltage
16V
Switching Freq
1400KHz
Package Type
DFN EP
Switching Regulator
Yes
Line Regulation
0.01%/V
Mounting
Surface Mount
Input Voltage (min)
2.2V
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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Quantity
Price
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FEATURES
TYPICAL APPLICATIO
APPLICATIO S
Tiny Solution Size
Low Quiescent Current:
150µA in Active Mode (V
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
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)
OLED Bias
CCD Bias
3V TO 4.2V
4.7µF
V
IN
6.8µH
U
PGOOD
CTRL
SW
V
SHDN
®
IN
Operation at Light Load
IN
LT3473
GND
= 3.6V, V
U
OUT
CAP
FB
OUT
2M
100k
2.2µF
= 15V,
3473 TA01a
0.47µF
V
25V
80mA
OUT
DESCRIPTIO
The LT
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
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.
Burst Mode is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Conversion Efficiency and Power Loss vs Output Current
Converter with Schottky
and Output Disconnect
2
®
. The internal 1A switch allows the device to deliver
3473/LT3473A are micropower step-up DC/DC
75
80
70
65
55
60
Micropower 1A Boost
0.1
V
V
IN
OUT
= 3.6V
= 15V
U
OUTPUT CURRENT (mA)
1
LT3473/LT3473A
10
3473 TA01b
100
500
400
300
200
100
0
1
3473f

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LT3473EDD#PBF Summary of contents

Page 1

... The rugged 36V switch and output disconnect circuitry allow outputs up to 34V to be easily generated in a simple boost topology. , 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. ...

Page 2

LT3473/LT3473A ABSOLUTE AXI U RATI GS V Voltage ............................................................. 16V IN SHDN Voltage .......................................................... 16V SW Voltage ............................................................. 36V PGOOD Voltage ...................................................... 36V CAP Voltage ............................................................ 36V OUT Voltage ........................................................... 36V FB Voltage .............................................................. 10V U PACKAGE/ORDER ...

Page 3

ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are 3V, SHDN = 3V, CTRL = 2V, unless otherwise specified. IN PARAMETER Switching Frequency Maximum Duty Cycle Switch Current Limit ...

Page 4

LT3473/LT3473A W U TYPICAL PERFOR A CE CHARACTERISTICS Sleep Mode Quiescent Current 105 SHDN = 100 95 90 – 100 TEMPERATURE (°C) 3473 G04 Switch V CE(SAT) 450 400 350 300 250 200 ...

Page 5

W U TYPICAL PERFOR A CE CHARACTERISTICS Disconnect PNP Quiescent Current 1.4 1.2 1.0 0.8 0.6 0.4 0 CAP VOLTAGE (V) 3473 G13 CTIO S (LT3473/LT3473A) ...

Page 6

LT3473/LT3473A W BLOCK DIAGRA FB – CTRL + 3 100mV + – – PGOOD 5 Q5 GND 9 FB – CTRL + 8 100mV + 1.25V – – PGOOD 9 Q5 GND ...

Page 7

U U APPLICATIO S I FOR ATIO Operation The LT3473 combines a current mode, fixed frequency PWM architecture with Burst Mode micropower operation to maintain high efficiency at light loads. Operation can best be understood by referring to the Block ...

Page 8

LT3473/LT3473A U U APPLICATIO S I FOR ATIO resulting sum is fed into the positive terminal of the PWM comparator A2. When this voltage exceeds the level of the error signal V , the SR latch is reset, turning off ...

Page 9

U U APPLICATIO S I FOR ATIO Inrush Current The LT3473 has an integrated Schottky power diode. When supply voltage is abruptly applied to the V while the output capacitor is discharged, the voltage difference between V and CAP generates ...

Page 10

LT3473/LT3473A U U APPLICATIO S I FOR ATIO between the OUT pin and ground. A ceramic capacitor with a value of 1µ good choice. The voltage drop (PNP V ) can be accounted for by setting the output ...

Page 11

... MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 12

... SW DC/DC Converter with Soft-Start LT3471 Dual Output, Boost/Inverter, 1.3A (I High Efficiency Boost-Inverting DC/DC Converter LT3479 3.5MHz, 42V Step-Up DC/DC Converter SW ThinSOT is a trademark of Linear Technology Corporation. Linear Technology Corporation 12 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● OUT ...

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