LT3482 LINER [Linear Technology], LT3482 Datasheet

no-image

LT3482

Manufacturer Part Number
LT3482
Description
90V Boost DC/DC Converter with APD Current Monitor
Manufacturer
LINER [Linear Technology]
Datasheet

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LT3482EUD
Manufacturer:
LT
Quantity:
10 000
Part Number:
LT3482EUD#PBF
Manufacturer:
LT凌特厂
Quantity:
20 000
Part Number:
LT3482EUD#TRPBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LT3482IUD
Manufacturer:
LT
Quantity:
10 000
Part Number:
LT3482IUD#PBF
Manufacturer:
ADI
Quantity:
40
Part Number:
LT3482IUD#PBF
Manufacturer:
LT凌特厂
Quantity:
20 000
Part Number:
LT3482IUD#TRPBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LT3482IUD#TRPBF
Quantity:
3 306
Company:
Part Number:
LT3482IUD#TRPBF
Quantity:
2 457
APPLICATIO S
FEATURES
TYPICAL APPLICATIO
OFF ON
High Output Voltage: Up to 90V
Integrated Schottky Diodes
48V, 280mA Internal Switch
High Side APD Current Monitor
Adjustable Switching Frequency: 650kHz or 1.1MHz
Wide V
Surface Mount Components
Low Shutdown Current: <1µA
Soft-Start
Internal Compensation
CTRL Pin Allows Output Adjustment with No Polarity
Inversion
3mm × 3mm 16-Lead QFN Package
APD Bias
PIN Diode Bias
Optical Receivers and Modules
Fiber Optic Network Equipment
V
5V
IN
IN
1µF
Range: 2.5V to 16V
10µH
10nF
U
V
f
SHDN
CTRL
GND
SET
IN
SW
MON
LT3482
0.1µF
10k
PUMP
MONIN
APD
V
V
OUT2
OUT1
FB
U
85V
AT 2.5mA
0.47µF
0.47µF
0.1µF
0.1µF
3482 TA01a
1M
14k
DESCRIPTIO
The LT
DC/DC converter with voltage doubler designed to bias
avalanche photodiodes (APDs) in optical receivers. It can
provide up to 90V output. The LT3482 features high side
APD current monitoring with better than 10% relative ac-
curacy over the entire temperature range. The integrated
power switch, Schottky diodes and APD current monitor
allow a small converter footprint and low solution cost.
Constant switching frequency results in predictable output
noise that is easy to fi lter. The inductor-based topology
ensures an input free from switching noise. An integrated
high side current monitor produces a current proportional
to APD current with better than 10% relative accuracy
over four decades of dynamic range in the input range of
250nA to 2.5mA. This current can be used as a reference
to provide a digitally programmed output voltage via the
CTRL pin. The LT3482 is available in the tiny footprint
(3mm × 3mm) 16-lead QFN package.
All other trademarks are the property of their respective owners.
100 V/DIV
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
RIPPLE
V
®
APD
3482 is a fi xed frequency current mode step-up
Converter with APD
90V Boost DC/DC
Output Voltage Ripple
U
Current Monitor
500ns/DIV
3482 TA01b
LT3482
3482fa
1

Related parts for LT3482

LT3482 Summary of contents

Page 1

... This current can be used as a reference to provide a digitally programmed output voltage via the CTRL pin. The LT3482 is available in the tiny footprint (3mm × 3mm) 16-lead QFN package. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. ...

Page 2

... LT3482EUD#PBF LT3482EUD#TRPBF LT3482IUD#PBF LT3482IUD#TRPBF Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi label on the shipping container. For more information on lead free parts, go to: For more information on tape and reel specifi cations, go to: ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi ...

Page 3

... MONIN = 90V APD APD = 0V, MONIN = 40V Note 2: The LT3482E is guaranteed to meet specifi ed performance from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating temperature range are assured by design, characterization and correlation with statisti- cal process controls. The LT3482I is guaranteed to meet performance specifi ...

Page 4

... LT3482 W U TYPICAL PERFOR A CE CHARACTERISTICS Oscillator Frequency vs Temperature 1200 1100 SET 1000 900 800 700 SET 600 500 – 100 125 –25 0 TEMPERATURE (°C) 3482 G01 Current Monitor Output vs MONIN 100µA APD ...

Page 5

... For lower switching frequency, tie to GND. MON (Pin 16): Current Monitor Output Pin. It sources a current equal to 20% of the APD current and converts to a reference voltage through an external resistor. Exposed Pad (Pin 17): GND. This pin must be soldered to the PCB. LT3482 3482fa 5 ...

Page 6

... The LT3482 has an integrated high side APD current moni- tor with a 5:1 ratio. The MONIN pin can accept a supply voltage up to 90V, which is suitable for APD photodiode applications ...

Page 7

... Diagram) to charge the output capacitor. The selection of inductor and capacitor value should ensure the peak of the inrush current to be below 1A. In addition, the LT3482 turn-on should be delayed until the inrush current is less than the maximum current limit. The peak inrush current can be estimated as follows: ⎛ ...

Page 8

... Always use a capacitor with suffi cient volt- age rating. Either ceramic or solid tantalum capacitors may be used for the input decoupling capacitor, which should be placed as close as possible to the LT3482. A 1µF capacitor is suffi cient for most applications. , the inductor OUT1 Phase Lead Capacitor A small value capacitor (i ...

Page 9

... U APPLICATIO S I FOR ATIO In some applications, a long cable or wire is used to connect the LT3482 to APD. When APD is shorted to GND, APD pin voltage might ring below ground and damage the internal circuitry. To prevent damage during short-circuit event, a 20Ω resistor must be added in series with the APD. ...

Page 10

... L1: COILCRAFT ME3220-103KL OR EQUIVALENT 3.3V to 70V APD Bias Power Supply with Fast Current Monitor Response C2 L1 0.1µF 6.8µ 3. PUMP 1µF V MONIN IN f LT3482 SET OFF ON V SHDN OUT2 CTRL V OUT1 GND FB MON APD R4 10k C1: MURATA X7R GRM21BR71C105KA01B C2: AVX 06035C104KAT2A C3, C6: AVX 08051C104KAT2A ...

Page 11

... Plastic QFN (3mm × 3mm) (Reference LTC DWG # 05-08-1691) 0.70 ±0.05 PACKAGE OUTLINE 0.25 ±0.05 0.50 BSC 0.75 ± 0.05 (4 SIDES) 1.45 ± 0.10 (4-SIDES) 0.200 REF 0.00 – 0.05 LT3482 BOTTOM VIEW—EXPOSED PAD PIN 1 NOTCH R = 0.20 TYP R = 0.115 OR 0.25 × 45° CHAMFER TYP 15 16 0.40 ± 0. (UD16) QFN 0904 0.25 ± 0.05 ...

Page 12

... LT3482 U TYPICAL APPLICATIO 3.3V to 40V APD Bias Power Supply PUMP MONIN IN f LT3482 SET OFF ON V SHDN OUT2 CTRL V OUT1 GND FB MON APD R4 10k C1: MURATA X7R GRM21BR71C105KA01B C2: MURATA X7R GRM31MR71H105KA88B C3, C4: AVX 06035C104KAT2A L1: COILCRAFT ME3220-562ML OR EQUIVALENT RELATED PARTS ...

Related keywords