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LT3482EUD#PBF

P1-P3P4-P6P7-P9P10-P12
LT3482
1
3482fa
90V Boost DC/DC
Converter with APD
Current Monitor
The LT
®
3482 is a fi xed frequency current mode step-up
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.
■
APD Bias
■
PIN Diode Bias
■
Optical Receivers and Modules
■
Fiber Optic Network Equipment
■
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
IN
Range: 2.5V to 16V
■
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
APPLICATIO S
U
FEATURES
DESCRIPTIO
U
TYPICAL APPLICATIO
U
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
1µF
0.1µF
1M
MONINV
IN
f
SET
SHDN
CTRL
GND
V
OUT2
V
OUT1
FB
SW PUMP
LT3482
MON APD
OFF ON
V
IN
5V
14k
85V
AT 2.5mA
3482 TA01a
0.47µF
0.47µF
0.1µF
10k
10nF
0.1µF
10µH
V
APD
RIPPLE
100 V/DIV
500ns/DIV
3482 TA01b
Output Voltage Ripple
LT3482
2
3482fa
Input Voltage (V
IN
) ....................................................16V
V
OUT1
, SW Voltage ....................................................48V
V
OUT2
, PUMP, MONIN, APD Voltage ..........................90V
FB Voltage ...................................................................5V
SHDN, f
SET
, CTRL Voltage .........................................16V
MON Voltage .............................................................12V
Operating Temperature Range
(Note 2) .................................................... –40°C to 85°C
Maximum Junction Temperature .......................... 125°C
Storage Temperature Range ................... –65°C to 125°C
(Note 1)
The
● denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 3V, V
⎯
S
⎯
H
⎯
D
⎯
N
= 3V unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Operating Voltage 2.5 V
Maximum Operating Voltage 16 V
Feedback Voltage CTRL = 1.5V
●
1.215
1.200
1.235 1.255
1.260
V
V
Feedback Line Regulation 0.025 0.07 %/V
FB Pin Bias Current
●
30 100 nA
Supply Current FB = 1.3V, Not Switching
V
⎯
S
⎯
H
⎯
D
⎯
N
= 0
3.3
0.1
4.0
0.5
mA
µA
Switching Frequency f
SET
= 0V
f
SET
= 2V
580
1.0
650
1.1
750
1.3
kHz
MHz
Maximum Duty Cycle f
SET
= 0V 95 %
Switch Current Limit 280 360 420 mA
Switch V
CESAT
I
SW
= 150mA 130 220 mV
Switch Leakage Current SW = 5V 2 µA
Schottky Forward Voltage I
SCHOTTKY
= 150mA 880 mV
Schottky Reverse Leakage V
OUT1
– SW = 50V 5 µA
SHDN Voltage High 1.5 V
ELECTRICAL CHARACTERISTICS
ABSOLUTE AXI U RATI GS
WWWU
16 15 14 13
5 6 7 8
TOP VIEW
17
UD PACKAGE
16-LEAD (3mm × 3mm) PLASTIC QFN
9
10
11
12
4
3
2
1NC
APD
MONIN
V
OUT2
SHDN
V
IN
GND
GND
MON
f
SET
FB
CTRL
V
OUT1
PUMP
SW
SW
T
JMAX
= 125°C, θ
JA
= 68°C/W, θ
JC
= 4.2°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
PIN CONFIGURATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3482EUD#PBF
LT3482IUD#PBF
LT3482EUD#TRPBF
LT3482IUD#TRPBF
LCFG
LCFG
16-Lead (3mm × 3mm) Plastic QFN
16-Lead (3mm × 3mm) Plastic QFN
0°C to 85°C
–40°C to 125°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container.
For more information on lead free parts, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to: http://www.linear.com/tapeandreel/
ORDER INFORMATION
LT3482
3
3482fa
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device reli-
ability and lifetime.
PARAMETER CONDITIONS MIN TYP MAX UNITS
SHDN Voltage Low 0.4 V
SHDN Pin Bias Current 35 50 µA
f
SET
Voltage High 1.5 V
f
SET
Voltage Low 0.4 V
f
SET
Bias Current f
SET
= 2V 22 40 µA
CTRL to FB Offset CTRL = 0.5V
●
–5
–10
2
2
10
15
mV
mV
APD Current Monitor Gain I
APD
= 250nA, 10V ≤ MONIN ≤ 90V
I
APD
= 2.5mA, 20V ≤ MONIN ≤ 90V
●
●
0.180
0.185
0.20
0.20
0.215
0.215
Monitor Output Voltage Clamp 11.5 V
APD Monitor Voltage Drop MONIN – APD at I
APD
= 1mA, MONIN = 90V 5 V
MONIN Pin Current Limit APD = 0V, MONIN = 40V 15 mA
The ● denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 3V, V
⎯
S
⎯
H
⎯
D
⎯
N
= 3V unless otherwise noted.
ELECTRICAL CHARACTERISTICS
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 cations over the –40°C to 125°C operating temperature range.
P1-P3P4-P6P7-P9P10-P12

LT3482EUD#PBF

Mfr. #:
Buy LT3482EUD#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 100V Boost DC/DC Converter w/ APD Current Monitor
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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