SGM41285 [SGMICRO]
70V, 300mW Boost Converter and Current Monitor for APD Bias Applications;
| 型号： | SGM41285 |
| 厂家： | 
Shengbang Microelectronics Co, Ltd |
| 描述： | 70V, 300mW Boost Converter and Current Monitor for APD Bias Applications 光电二极管 |
| 文件： | 总15页 (文件大小：894K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SGM41285
70V, 300mW Boost Converter and Current
Monitor for APD Bias Applications
GENERAL DESCRIPTION
FEATURES
SGM41285 is a boost DC-DC converter with a wide
input voltage range of 2.8V to 5.5V. This device can
deliver a maximum of 70V output voltage and 4mA
monitoring current limit. The 850kHz fixed switching
frequency and PWM mode allow this device to
minimize noise of output voltage. The constant PWM
frequency provides easy filtering of output voltage in
low noise applications.
● 2.8V to 5.5V Input Voltage Range
● (VIN + 5V) to 70V Wide Output Voltage Range
● 850kHz Fixed Switching Frequency
● Internal 0.6Ω (TYP) 72V MOSFET
● Less than 1μA Shutdown Current
● Boost Converter Output Power:
SGM41285A: 300mW
SGM41285B: 200mW
● High-side Current Monitor Ratios:
SGM41285A: 1:1
This device integrates the fast biased avalanche
photodiode (APD) current monitor limit with 1μs
response time. The current limiting function with
adjustable resistors protects the APD from the effects
of optical power transients. The SGM41283 integrates
various protection features such as soft-start,
cycle-by-cycle current limit, under-voltage lockout
(UVLO) and thermal shutdown.
SGM41285B: 5:1
● Accurate High-side APD Current Monitor with 1:1
and 5:1 Ratios
● Resistor-Adjustable Ultra-Fast APD Current Limit
(1μs Response Time)
● Open-Drain Current-Limit Indicator Flag
● Constant PWM Frequency Provides Easy Filtering
in Low Noise Applications
The SGM41285 is available in a Green TQFN-3×3-16L
package. It operates over an ambient temperature
range of -40℃ to +125℃.
● Internal Soft-Start Function
● -40℃ to +125℃ Operating Temperature Range
● Available in a Green TQFN-3×3-16L Package
APPLICATIONS
Avalanche Photodiode Bias and Monitor
Supply for PIN Diode Bias
Supply for Low-Noise Varactor Diode Bias
FBON and GPON Modules
SG Micro Corp
NOVEMBER2020–REV. A.2
www.sg-micro.com
70V, 300mW Boost Converter and Current
Monitor for APD Bias Applications
SGM41285
PACKAGE/ORDERING INFORMATION
SPECIFIED
TEMPERATURE
RANGE
PACKAGE
ORDERING
NUMBER
PACKAGE
MARKING
PACKING
OPTION
MODEL
DESCRIPTION
TQFN-3×3-16L
TQFN-3×3-16L
GMDTQ
XXXXX
SGM41285A
SGM41285B
SGM41285AXTQ16G/TR
SGM41285BXTQ16G/TR
Tape and Reel, 4000
Tape and Reel, 4000
-40℃ to +125℃
-40℃ to +125℃
GMETQ
XXXXX
MARKING INFORMATION
SGM41285A
SGM41285B
(1) XXXXX = Date Code, Trace Code and Vendor Code.
(2) XXXXX = Date Code and Vendor Code.
X X X X X
X X X X X
Vendor Code
Trace Code
Vendor Code
Date Code - Week
Date Code - Year
Date Code - Year
Green (RoHS & HSF): SG Micro Corp defines "Green" to mean Pb-Free (RoHS compatible) and free of halogen substances. If
you have additional comments or questions, please contact your SGMICRO representative directly.
OVERSTRESS CAUTION
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed in Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to
absolute maximum rating conditions for extended periods
may affect reliability. Functional operation of the device at any
conditions beyond those indicated in the Recommended
Operating Conditions section is not implied.
IN, nSHDN, FB, nILIM, RLIM, CNTRL, CLAMP to SGND
............................................................................. -0.3V to 6V
SW to PGND...................................................... -0.3V to 76V
BIAS to SGND ................................................... -0.3V to 76V
APD, to SGND.................................... -0.3V to (VBIAS + 0.3V)
PGND to SGND................................................ -0.3V to 0.3V
MOUT to SGND............................... -0.3V to (VCLAMP + 0.3V)
Package Thermal Resistance
ESD SENSITIVITY CAUTION
TQFN-3×3-16L, θJA.................................................... 45℃/W
Junction Temperature.................................................+150℃
Storage Temperature Range.......................-65℃ to +150℃
Lead Temperature (Soldering, 10s)............................+260℃
ESD Susceptibility
This integrated circuit can be damaged by ESD if you don’t
pay attention to ESD protection. SGMICRO recommends that
all integrated circuits be handled with appropriate precautions.
Failureto observe proper handlingand installation procedures
can cause damage. ESD damage can range from subtle
performance degradation tocomplete device failure. Precision
integrated circuits may be more susceptible to damage
because very small parametric changes could cause the
device not to meet its published specifications.
HBM.............................................................................4000V
MM.................................................................................200V
CDM ............................................................................1000V
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range...........................................2.8V to 5.5V
Operating Ambient Temperature Range......-40℃ to +125℃
Operating Junction Temperature Range......-40℃ to +125℃
DISCLAIMER
SG Micro Corp reserves the right to make any change in
circuit design, or specifications without prior notice.
SG Micro Corp
www.sg-micro.com
NOVEMBER 2020
2
70V, 300mW Boost Converter and Current
Monitor for APD Bias Applications
SGM41285
PIN CONFIGURATION
(TOP VIEW)
16
15
14
13
PGND
IN
1
2
3
4
12 APD
CLAMP
11
GND
nSHDN
SGND
10 MOUT
9
RLIM
5
6
7
8
TQFN-3×3-16L
PIN DESCRIPTION
PIN
NAME
FUNCTION
Power Ground. This pin connects to the negative terminals of the input and output capacitors. It
connects to SGND at an external single point, usually at the return terminal of the output capacitor.
1, 16
PGND
2
3
IN
Input Supply Voltage. Use a ceramic capacitor with a minimum value of 1μF to bypass IN to PGND.
Active Low Shutdown Control Input. Logic low to nSHDN shuts down the device. Connect it to IN for
normal operation.
nSHDN
Signal Ground. Connect to the ground directly. Connect SGND to PGND at a single point, usually close
to the return terminal of the output capacitor.
4, 8
5
SGND
FB
Feedback Regulation Input. Connect to the resistive voltage divider’s center tap.
Control Input for Boost Converter. When VCNTRL ＜ 1.2V, this pin could set the feedback set-point
6
CNTRL
voltage externally. When VCNTRL ＞ 1.3V, the internal 1.20V (TYP) feedback set-point voltage can be
used.
7
9
nILIM
RLIM
Open-Drain Current-Limit Indicator. This pin is set low when exceeding APD current limit.
Current-Limit Resistor Connection. A resistor between RLIM and SGND programs the APD current-
limit threshold. When RLIM connects to SGND, the current limit is set to 4.5mA.
Current Monitor Output. For the SGM41285A, it provides 100% APD current. For the SGM41285B, it
provides 20% APD current.
10
MOUT
11
12
CLAMP Clamp Voltage Input. This pin is an external potential used for MOUT voltage clamp.
APD
Reference Current Output. APD provides the source current to the cathode of the photodiode.
Bias Voltage Input. A current source for APD. Connect this pin directly or through a low-pass filter to the
output for ripple attenuation. It provides voltage bias for the current monitor.
13
BIAS
Drain of Internal 72V N-Channel DMOS. Connect inductor to SW. Connect to SW with the shortest path
to reduce switching noise emission.
14, 15
SW
Exposed Exposed Pad. The thermal dissipation is improved by connecting to a large copper plane at the SGND
‒
Pad
and PGND potential. It is not the only ground connection.
SG Micro Corp
www.sg-micro.com
NOVEMBER 2020
3
70V, 300mW Boost Converter and Current
Monitor for APD Bias Applications
SGM41285
ELECTRICAL CHARACTERISTICS
(VIN = VnSHDN = VCNTRL = 3.3V, VBIAS = 40V, VMOUT = 0V, VPGND = VSGND = 0V, CIN = 1μF, SW = APD = CLAMP = nILIM =
unconnected, Full = -40℃ to +125℃, typical values are at TA = +25℃, unless otherwise noted.)
PARAMETER
Input Supply
SYMBOL
CONDITIONS
TEMP
MIN
TYP
MAX
UNITS
Supply Voltage Range
Supply Current
VIN
ISUPPLY
VUVLO
Full
Full
2.8
5.5
280
2.6
V
μA
V
VFB = 1.4V, no switching
VIN rising
190
2.5
Under-Voltage Lockout Threshold
Under-Voltage Lockout Hysteresis
Shutdown Current
Full
2.4
VUVLO_HYS
ISHDN
200
0.01
0.01
mV
μA
μA
+25℃
Full
VnSHDN = 0V
1
Shutdown Bias Current
Boost Converter
IBIAS_SHDN VBIAS = 3.3V, VnSHDN = 0V
Full
0.6
Output-Voltage Adjustment Range
Switching Frequency
Full
VIN + 5
750
70
950
V
kHz
%
fSW
Full
850
90
Maximum Duty Cycle
DMAX
87.5
92.5
1.225
400
+25℃
Full
FB Set-Point Voltage
VFB_SET
1.175
1.20
V
FB Input-Bias Current
Internal Switch On-Resistance
Peak Switch Current Limit
Peak Current-Limit Response
Switch Leakage Current
Line Regulation
IFB
RON
VFB = VFB_SET
ISW = 100mA
nA
Ω
+25℃
Full
0.6
1.1
100
1.2
ILIM_SW
0.9
1.35
A
+25℃
+25℃
+25℃
+25℃
+25℃
+25℃
ns
μA
%
VSW = 72V
1
2.8V ≤ VIN ≤ 5.5V, ILOAD = 4.5mA
0 ≤ ILOAD ≤ 4.5mA
0.1
0.05
4
Load Regulation
%
Soft-Start Duration
ms
Control Input (CNTRL)
Maximum Control Input Voltage
CNTRL-to-REF Transition Threshold
CNTRL Input-Bias Current
Current Monitor
FB set point is controlled to VCNTRL
VFB = VREF above this voltage
VCNTRL = VFB_SET
1.2
1.3
V
V
+25℃
+25℃
+25℃
400
nA
Bias Voltage Range
VBIAS
Full
10
70
280
280
4.7
3
V
SGM41285A
SGM41285B
SGM41285A
SGM41285B
220
220
4
Full
Full
Full
I
APD = 500nA
μA
Bias Quiescent Current
Voltage Drop
IBIAS
IAPD = 2mA
mA
2
Full
Full
VDROP
RMOUT
IAPD = 2mA, VDROP = VBIAS - VAPD
1.9
2.3
V
Dynamic Output Resistance at
MOUT
RMOUT = ΔVMOUT/ΔIMOUT,
IAPD = 2.5mA
SGM41285A
5
GΩ
+25℃
APD Current-Step Response
MOUT Output Leakage
Step load on IAPD = 20μA to 1mA
50
1
ns
+25℃
+25℃
APD is unconnected
400
1.1
nA
VMOUT
VCLAMP
-
Output Clamp Voltage
Forward diode current = 500µA
Full
0.8
0.95
V
SG Micro Corp
www.sg-micro.com
NOVEMBER 2020
4
70V, 300mW Boost Converter and Current
Monitor for APD Bias Applications
SGM41285
ELECTRICAL CHARACTERISTICS (continued)
(VIN = VnSHDN = VCNTRL = 3.3V, VBIAS = 40V, VMOUT = 0V, VPGND = VSGND = 0V, CIN = 1μF, SW = APD = CLAMP = nILIM =
unconnected, Full = -40℃ to +125℃, typical values are at TA = +25℃, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
SGM41285A
TEMP
MIN
TYP
1.05
0.2
1
MAX
1.170
0.225
1.025
0.204
UNITS
0.965
0.172
0.985
0.195
Full
Full
I
APD = 500nA
SGM41285B
SGM41285A
SGM41285B
SGM41285A
SGM41285B
Current Gain
IMOUT/IAPD
mA/mA
Full
IAPD = 2mA
0.2
30
Full
(ΔIMOUT/IMOUT)/ΔVBIAS
VBIAS = 10V to 70V and
IAPD = 5μA to 1mA
,
+25℃
+25℃
Full
Power-Supply Rejection Ratio
PSRR
ILIM_APD
ppm/V
mA
30
APD Input Current Limit
Logic I/O
3.95
1.5
4.5
5.05
0.3
nSHDN Input Voltage Low
nSHDN Input Voltage High
nILIM Output Voltage Low
nILIM Output Leakage Current
Thermal Protection
VIL
VIH
VOL
IOH
Full
Full
V
V
ILIM = 2mA
Full
200
1
mV
μA
+25℃
Thermal Shutdown
TSHDN
THYS
170
20
℃
℃
Thermal Shutdown Hysteresis
SG Micro Corp
www.sg-micro.com
NOVEMBER 2020
5
70V, 300mW Boost Converter and Current
Monitor for APD Bias Applications
SGM41285
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 3.3V, VOUT = 70V, TA = +25℃, unless otherwise noted.
Exiting Shutdown
Entering Shutdown
VIN = 3.3V, VOUT = 70V
VIN = 3.3V, VOUT = 70V
VnSHDN
VnSHDN
VOUT
VOUT
IL
IL
Time (2ms/div)
Time (20ms/div)
Light-Load Switching Waveforms with RC Filter
Heavy-Load Switching Waveforms with RC Filter
VIN = 3.3V, VOUT = 70V
AC Coupled
VIN = 3.3V, VOUT = 70V
AC Coupled
VBIAS
VBIAS
VSW
VSW
IL
IL
Time (1μs/div)
Time (1μs/div)
Load-Transient Response
Line-Transient Response
VIN = 3.3V, VOUT = 70V
VIN = 3.3V, VOUT = 70V
AC Coupled
AC Coupled
IAPD
VIN
VBIAS
AC Coupled
VBIAS
Time (1ms/div)
Time (1ms/div)
SG Micro Corp
NOVEMBER 2020
www.sg-micro.com
6
70V, 300mW Boost Converter and Current
Monitor for APD Bias Applications
SGM41285
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 3.3V, VOUT = 70V, TA = +25℃, unless otherwise noted.
APD Transient Response
APD Transient Response
SGM41285A
VIN = 3.3V, VOUT = 70V
VIN = 3.3V, VOUT = 70V
SGM41285A
IAPD
IAPD
IMOUT
IMOUT
VAPD
AC Coupled
Time (1ms/div)
Time (50ns/div)
Startup Delay
Startup Delay
VIN = 3.3V, VBIAS = 70V, IAPD = 2mA
VIN = 3.3V, VBIAS = 10V, IAPD = 2mA
VnSHDN
VnSHDN
VBIAS
VBIAS
IMOUT
IMOUT
Time (2ms/div)
Time (500μs/div)
Short-Circuit Response
APD Output Ripple Voltage
VIN = 3.3V, VOUT = 70V
VIN = 3.3V, VOUT = VBIAS = 70V, IAPD = 1mA,
(0.1μF from APD to ground)
VAPD
AC Coupled
VAPD
IMOUT
VnILIM
Time (2μs/div)
Time (1μs/div)
SG Micro Corp
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NOVEMBER 2020
7
70V, 300mW Boost Converter and Current
Monitor for APD Bias Applications
SGM41285
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 3.3V, VOUT = 70V, TA = +25℃, unless otherwise noted.
Efficiency vs. Load Current
Efficiency vs. Load Current
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
VIN = 3.3V
VIN = 5V
VOUT = 30V
VOUT = 30V
V
V
OUT = 50V
OUT = 70V
V
V
OUT = 50V
OUT = 70V
0
0.5
1
1.5
2
2.5
3
3.5
4
0
0.5
1
1.5
2
2.5
3
3.5
4
Load Current (mA)
Load Current (mA)
Minimum Startup Voltage vs. Load Current
Supply Current vs. Supply Voltage
VFB = 1.4V
2.6
0.4
0.32
0.24
0.16
0.08
0
2.56
2.52
2.48
2.44
2.4
0
0.5
1
1.5
2
2.5
3
3.5
4
2.5
3
3.5
4
4.5
5
5.5
Load Current (mA)
Supply Voltage (V)
Bias Quiescent Current vs. APD Current
SGM41285A
Bias Quiescent Current vs. APD Current
SGM41285B
10
1
10
1
V
BIAS = 70V
VBIAS = 70V
0.1
0.1
0.01
0.01
0.0001
0.001
0.01
0.1
1
10
0.0001
0.001
0.01
0.1
1
10
APD Current (mA)
APD Current (mA)
SG Micro Corp
www.sg-micro.com
NOVEMBER 2020
8
70V, 300mW Boost Converter and Current
Monitor for APD Bias Applications
SGM41285
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 3.3V, VOUT = 70V, TA = +25℃, unless otherwise noted.
Gain Error vs. APD Current
Gain Error vs. APD Current
7
6
5
4
3
2
1
0
0.4
0.3
0.2
0.1
0
SGM41285A
BIAS = 70V
SGM41285B
VBIAS = 70V
V
-0.1
-0.2
-0.3
-0.4
-0.5
0.1
1
10
100
1000
10000
0.1
1
10
100
1000
10000
APD Current (µA)
APD Current (µA)
Gain Error vs. Bias Voltage
SGM41285A
IAPD = 0.5µA
Gain Error vs. Bias Voltage
SGM41285B
8
7
6
5
4
3
2
1
0
1.5
1
IAPD = 500µA
0.5
0
IAPD = 2mA
IAPD = 5µA
IAPD = 50µA
-0.5
-1
IAPD = 500µA
IAPD = 50µA
IAPD = 5µA
IAPD = 0.5µA
IAPD = 2mA
-1.5
0
10
20
30
40
50
60
70
80
0
10
20
30
40
50
60
70
80
Bias Voltage (V)
Bias Voltage (V)
Bias Quiescent Current vs. Bias Voltage
Bias Quiescent Current vs. Bias Voltage
SGM41285B
10
1
10
1
SGM41285A
IAPD = 2mA
IAPD = 2mA
IAPD = 500nA
IAPD = 500nA
0.1
0.01
0.1
0.01
0
10
20
30
40
50
60
70
80
0
10
20
30
40
50
60
70
80
Bias Voltage (V)
Bias Voltage (V)
SG Micro Corp
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NOVEMBER 2020
9
70V, 300mW Boost Converter and Current
Monitor for APD Bias Applications
SGM41285
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 3.3V, VOUT = 70V, TA = +25℃, unless otherwise noted.
Bias Quiescent Current vs. Temperature
SGM41285A
Bias Quiescent Current vs. Temperature
SGM41285B
10
10
IAPD = 2mA
IAPD = 2mA
1
1
IAPD = 500nA
IAPD = 500nA
0.1
0.1
-40 -25 -10
5
20 35 50 65 80 95 110 125
-40 -25 -10
5
20 35 50 65 80 95 110 125
Temperature (℃)
Temperature (℃)
Switching Frequency vs. Input Voltage
Switching Frequency vs. Temperature
910
890
870
850
830
810
790
875
870
865
860
855
850
845
840
835
2.5
3
3.5
4
4.5
5
5.5
-40 -25 -10
5
20 35 50 65 80 95 110 125
Input Voltage (V)
Temperature (℃)
FB Set-Point Voltage vs. Temperature
SW Leakage Current vs. Temperature
Current into SW pins
1.2024
1.2022
1.202
200
180
160
140
120
100
80
V
SW = 70V
1.2018
1.2016
1.2014
1.2012
1.201
60
40
1.2008
1.2006
20
0
-40 -25 -10
5
20 35 50 65 80 95 110 125
-40 -25 -10
5
20 35 50 65 80 95 110 125
Temperature (℃)
Temperature (℃)
SG Micro Corp
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NOVEMBER 2020
10
70V, 300mW Boost Converter and Current
Monitor for APD Bias Applications
SGM41285
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 3.3V, VOUT = 70V, TA = +25℃, unless otherwise noted.
Voltage Drop vs. APD Current
3.5
3
2.5
2
1.5
1
0.5
0
0.1
1
10
100
1000
10000
APD Current (µA)
SG Micro Corp
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NOVEMBER 2020
11
70V, 300mW Boost Converter and Current
Monitor for APD Bias Applications
SGM41285
REVISION HISTORY
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
NOVEMBER 2020 ‒ REV.A.1 to REV.A.2
Page
Updated Marking Information section...................................................................................................................................................................2
JANUARY 2019 ‒ REV.A to REV.A.1
Updated operating temperature range and Electrical Characteristics................................................................................................................4-5
Changes from Original (DECEMBER 2018) to REV.A
Changed from product preview to production data.............................................................................................................................................All
SG Micro Corp
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NOVEMBER 2020
12
PACKAGE INFORMATION
PACKAGE OUTLINE DIMENSIONS
TQFN-3×3-16L
D
e
N16
N1
L
D1
E
E1
k
N5
b
BOTTOM VIEW
TOP VIEW
1.7
0.7
A
3.6 2.2 1.7
A1
A2
SIDE VIEW
0.5
0.24
RECOMMENDED LAND PATTERN (Unit: mm)
Dimensions
In Millimeters
Dimensions
In Inches
Symbol
MIN
MAX
0.800
0.050
MIN
0.028
0.000
MAX
0.031
0.002
A
A1
A2
D
0.700
0.000
0.203 REF
0.008 REF
2.900
1.600
2.900
1.600
3.100
1.800
3.100
1.800
0.114
0.063
0.114
0.063
0.122
0.071
0.122
0.071
D1
E
E1
k
0.200 MIN
0.500 TYP
0.008 MIN
0.020 TYP
b
0.180
0.300
0.300
0.500
0.007
0.012
0.012
0.020
e
L
SG Micro Corp
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TX00081.000
PACKAGE INFORMATION
TAPE AND REEL INFORMATION
REEL DIMENSIONS
TAPE DIMENSIONS
P2
P0
W
Q2
Q4
Q2
Q4
Q2
Q4
Q1
Q3
Q1
Q3
Q1
Q3
B0
Reel Diameter
P1
A0
K0
Reel Width (W1)
DIRECTION OF FEED
NOTE: The picture is only for reference. Please make the object as the standard.
KEY PARAMETER LIST OF TAPE AND REEL
Reel Width
Reel
Diameter
A0
B0
K0
P0
P1
P2
W
Pin1
Package Type
W1
(mm)
(mm) (mm) (mm) (mm) (mm) (mm) (mm) Quadrant
TQFN-3×3-16L
13″
12.4
3.35
3.35
1.13
4.0
8.0
2.0
12.0
Q2
SG Micro Corp
TX10000.000
www.sg-micro.com
PACKAGE INFORMATION
CARTON BOX DIMENSIONS
NOTE: The picture is only for reference. Please make the object as the standard.
KEY PARAMETER LIST OF CARTON BOX
Length
(mm)
Width
(mm)
Height
(mm)
Reel Type
Pizza/Carton
13″
386
280
370
5
SG Micro Corp
www.sg-micro.com
TX20000.000
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