lt3571 Linear Technology Corporation, lt3571 Datasheet - Page 16

• Manufacturer Part Number: lt3571
• Description: 75v Dc/dc Converter For Apd Bias
• Manufacturer: Linear Technology Corporation

LT3571
TYPICAL APPLICATIONS
RELATED PARTS
PART NUMBER
LT1930/LT1930A 1A(I
LT3460/LT3460-1 0.3A (I
LT3461/LT3461A 0.3A (I
LT3482
ThinSOT is a trademark of Linear Technology Corporation.
16
3.3V
V
IN
L1: TDK VLF3010AT-100MR49
C1: MURATA X7R GRM21BR71C105KA01B
C2, C3: MURATA X7R GRM188R72A104KA35
Transient Response on Input Signal Falling Edge
PWM GND
FOR TRANSIENT RESPONSE, PLEASE REFER TO FIGURE 4
OUT GND
C1
1μF
500mV/DIV
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
OFF ON
R
26.1k
500kHz
1V/DIV
T
PWM
3.3V to 50V APD Bias Power Supply
OUT
DESCRIPTION
DC/DC Converters
DC/DC Converters
Step-Up DC/DC Converters with Integrated Schottky
0.3A (I
with APD Current Monitor
SW
I
APD
SW
SW
SW
SYNC
SHDN
V
CTRL
R
), 1.2MHz/2.2MHz High Effi ciency Step-Up
REF
T
●
GND
= 1mA
), 1.3MHz, 650kHz High Effi ciency Step-Up
), 1.3MHz/3MHz High Effi ciency
), 650k/1.1MHz Step-Up DC/DC Converter
(1mA to 10μA)
FAX: [phone]
V
IN
T
FD
LT3571
MON
50ns/DIV
10μH
< 100ns
L1
R3
10k
SW
I
MONIN
APD
APD
V
OUT
= 10μA
FB
●
50V
www.linear.com
55V
3571 TA13
R
20Ω
R2
18.2k
R1
1M
SENSE
C3
0.1μF
COMMENTS
V
ThinSOT™ Package
V
Packages
V
V
3mm × 3mm QFN Package
3571 TA11
IN
IN
IN
IN
C2
0.1μF
: 2.6V to 16V, V
: 2.5V to 16V, V
: 2.5V to 16V, V
: 2.5V to 16V, V
PWM GND
OUT GND
500mV/DIV
Transient Response on Input Signal Falling Edge
1V/DIV
PWM
OUT(MAX)
OUT(MAX)
OUT(MAX)
OUT1(MAX)
OUT
450
400
350
300
250
200
150
100
50
0
0
I
Input Power vs APD Current
APD
= 34V, I
= 38V, I
= 38V, I
= 48V, V
= 10μA
0.5
(10μA to 1mA)
Q
Q
Q
T
APD CURRENT (mA)
RD
= 4.2mA/5.5mA, I
= 2mA, I
= 2.8mA, I
OUT2(MAX)
50ns/DIV
< 100ns
© LINEAR TECHNOLOGY CORPORATION 2009
1
SD
I
APD
= 90V, I
SD
<1μA, SC70 and ThinSOT
<1μA, ThinSOT Package
= 1mA
1.5
SD
Q
= 3.3mA, I
3571 TA14
<1μA,
LT 0109 • PRINTED IN USA
3571 TA12
2
SD
<1μA,
3571f