SGM3785S [SGMICRO]
2MHz, 1.5A Flash LED Driver;
| 型号： | SGM3785S |
| 厂家： | 
Shengbang Microelectronics Co, Ltd |
| 描述： | 2MHz, 1.5A Flash LED Driver |
| 文件： | 总16页 (文件大小：1078K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SGM3785S
2MHz, 1.5A Flash LED Driver
GENERAL DESCRIPTION
FEATURES
The SGM3785S is a highly integrated Boost DC/DC
converter with 2MHz fixed frequency. High switching
frequency makes it easy to use small components and
optimized for portable photoflash. The SGM3785S is
ideal for high power flash LEDs which are suitable for
mobile phone camera modules and digital still cameras.
● Input Voltage Range: 3V to 5V
● Up to Total 1.5A LED Current
● Up to 90% Efficiency
● Dual Flash LED Outputs
● Tiny Inductor: 1.0μH
● 2MHz Boost Converter
● Separate Flash Mode Enable and Movie/Torch
Mode Enable Control Pins
The SGM3785S offers excellent flexibility to enter flash
mode and movie/torch mode through the ENF and
ENM pins respectively. Flash mode is usually used with
670ms timer control to generate a high intensity flash.
The maximal flash current and movie/torch current are
respectively programmed through external resistors
(RSETF and RSETM), which can provide simple control for
the flash LED solution. The real LED current in flash
mode and movie/torch mode can be programmed by
external PWM signal on ENM pin.
● Flash Current and Movie/Torch Current can be
Programmed through PWM Signal on ENM Pin
● Independent Resistors Set Flash Current and
Movie/Torch Current Respectively
● Integrated Thermal Regulation Control
● 670ms Flash Timer Control
● 360kΩ Pull-Down Resistor on ENM and ENF Pins
● Protection Features
Output Over-Voltage Protection
LED Open or Short Protection
The D1 and D2 pins can be tied together to drive higher
power single flash LEDs, sinking up to 1.5A continuous
current. The integrated thermal regulation in flash mode
limits the temperature of the device to prevent the
device from triggering thermal shutdown by reducing
the LED sink current below the programmed value.
Cycle-by-Cycle Current Limit
● Less than 1μA Shutdown Current
● Available in a Green TDFN-3×2-14L Package
● Temperature Range: -40℃ to +85℃
The SGM3785S provides very low shutdown current. It
also includes a comprehensive set of protection
features such as over-voltage protection, LED open or
short protection and thermal shutdown.
APPLICATIONS
Portable Equipment
The SGM3785S is available in a Green TDFN-3×2-14L
package. It operates over an ambient temperature
range of -40℃ to +85℃.
SG Micro Corp
DECEMBER 2022 – REV. A
www.sg-micro.com
SGM3785S
2MHz, 1.5A Flash LED Driver
PACKAGE/ORDERING INFORMATION
SPECIFIED
PACKAGE
DESCRIPTION
ORDERING
NUMBER
PACKAGE
MARKING
PACKING
OPTION
MODEL
TEMPERATURE
RANGE
028DP
XXXXX
SGM3785S
TDFN-3×2-14L
SGM3785SYTDP14G/TR
Tape and Reel, 3000
-40℃ to +85℃
MARKING INFORMATION
NOTE: XXXXX = Date Code, Trace Code and Vendor Code.
X X X X X
Vendor Code
Trace Code
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.
ABSOLUTE MAXIMUM RATINGS
OVERSTRESS CAUTION
VIN, VOUT, D1 and D2 Voltages......................... -0.3V to 6V
ENF, ENM, RSETF, RSETM ....................-0.3V to VIN + 0.3V
SW Voltage.......................................................... -0.3V to 6V
Package Thermal Resistance
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.
TDFN-3×2-14L, θJA.................................................... 59℃/W
Junction Temperature.................................................+150℃
Storage Temperature Range........................-65℃ to +150℃
Lead Temperature (Soldering, 10s)............................+260℃
ESD Susceptibility
ESD SENSITIVITY CAUTION
This integrated circuit can be damaged if ESD protections are
not considered carefully. 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 even small parametric changes could cause the
device not to meet the published specifications.
HBM.............................................................................4000V
CDM ............................................................................1000V
RECOMMENDED OPERATING CONDITIONS
Operating Ambient Temperature Range.........-40℃ to +85℃
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
DECEMBER 2022
2
SGM3785S
2MHz, 1.5A Flash LED Driver
PIN CONFIGURATION
SGM3785S (TOP VIEW)
RSETM
1
2
3
4
5
6
7
14 D2
RSETF
AGND
VIN
13 AGND
12 D1
11 ENM
10 ENF
AGND
SW
SW
9
8
VOUT
VOUT
PGND
TDFN-3×2-14L
PIN DESCRIPTION
PIN
1
NAME
FUNCTION
RSETM Movie/Torch Mode Current Setting Pin.
RSETF Flash Mode Current Setting Pin.
2
3, 13
4
AGND
VIN
Analog Ground Pin.
Input Supply Pin.
5, 6
7
SW
Boost Converter Switching Node.
Power Ground Pin.
PGND
VOUT
8, 9
Output Voltage Pin.
Flash Mode Enable Pin. It has an internal 360kΩ pull-down resistor to AGND. Regardless of ENM,
only when ENF = “High”, flash mode is active and the flash current is equal to ISETF × D. D is the duty
cycle of PWM signal on ENM pin. The frequency of PWM exceeds 15kHz.
10
ENF
PWM Dimming Pin and Movie/Torch Mode Enable Pin. It has an internal 360kΩ pull-down resistor to
AGND. In flash mode, the PWM signal at ENM pin is the flash current dimming control. When ENF =
“Low” and the time of ENM = “High” is not less than 5ms, Movie/Torch mode is active. The LED current
should be equal to ISETM × D. D is the duty cycle of PWM signal at ENM pin. This PWM signal is sent to
ENM pin after the first pulse, high level time of which pulse is more than 5ms. When ENF = “Low” and the
time of ENM = “Low” is not less than 5ms, the chip enters shutdown mode.
11
ENM
Regulated Current Sink 1. It can sink up to 0.75A current. D1 and D2 pins can be tied together to sink
total 1.5A.
12
14
D1
D2
Regulated Current Sink 2. It can sink up to 0.75A current. D1 and D2 pins can be tied together to sink
total 1.5A.
Exposed
Pad
Exposed Pad. It is connected to analog ground internally. Connect this pad to ground plane for good
thermal performance.
AGND
SG Micro Corp
www.sg-micro.com
DECEMBER 2022
3
SGM3785S
2MHz, 1.5A Flash LED Driver
ELECTRICAL CHARACTERISTICS
(VIN = VEN = 3.6V, TA = -40℃ to +85℃, typical values are at TA = +25℃, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
IC Supply
Input Voltage Range
VIN
3
5
V
V
Under-Voltage Lockout Threshold
Under-Voltage Lockout Hysteresis
Supply Current
UVLO Rising edge
VHYS
2.40 2.57
2.75
0.2
260
0.1
V
IQ
Not switching
360
1
μA
μA
Supply Current in Shutdown
Boost Converter
ISHDN
ENF = ENM = GND
Valley PMOS Current Limit
Oscillator Frequency
ILIM
fS
VOVP
tS
2.7
2
A
MHz
V
Internal Over-Voltage Threshold of OUT
Flash Mode Soft-Start Time
Current Sink
5.3
1
ms
Total Output Current, Movie/Torch Mode
175
200
225
mA
A
ENM = High, RSETM = 68kΩ, D1 + D2, TA = +25℃
ENF = High, ENM = GND, RSETF = 12kΩ, D1 + D2,
TA = +25℃
ID
Total Output Current, Flash Mode
Output Current Matching
1.32 1.50
1.68
0.5
0.6
5
5
4
%
%
100mA per channel, TA = +25℃, movie/torch mode
750mA per channel, TA = +25℃, flash mode
LED Short Checking Current
ISHORT D1 and D2 connected together
mA
Control
ENF, ENM Pin Logic Low Threshold
ENF, ENM Pin Logic High Threshold
ENF Internal Pull-Down Resistance
ENM Internal Pull-Down Resistance
Junction Thermal Shutdown Threshold
Junction Thermal Shutdown Hysteresis
VIL
VIH
0.6
V
V
1.5
360
360
143
30
RPD(ENF)
RPD(ENM)
TSD
kΩ
kΩ
℃
℃
THYS
Delay Time to Shutdown Status in Movie/Torch Mode (for PWM Dimming LED Current)
Delay Time
tD
5
ms
ms
ms
μs
Flash Timer
Hardware Flash Timer
tTIME
550
5
670
780
Delay Time of ENM = "High" to Enter Movie/Torch Mode
Delay Time (Entering Movie/Torch Mode)
tM
Minimum Time of Logic "High" of PWM Signal
Minimum Time of Logic “High” of PWM Signal
tH
5
SG Micro Corp
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DECEMBER 2022
4
SGM3785S
2MHz, 1.5A Flash LED Driver
TYPICAL PERFORMANCE CHARACTERISTICS
TA = +25℃, VIN = 3.6V, L = 1.0μH, CIN = 4.7μF, and COUT = 4.7μF, unless otherwise noted.
Efficiency vs. Input Voltage
Switching Frequency vs. Input Voltage
100
94
88
82
76
70
2.2
2.1
2.0
1.9
1.8
1.7
— ILED = 0.1A — ILED = 0.2A
— ILED = 0.4A — ILED = 0.6A
— ILED = 0.8A — ILED = 1.0A
— ILED = 1.2A
3.0
3.4
3.8
4.2
4.6
5.0
3.0
3.4
3.8
4.2
4.6
5.0
Input Voltage (V)
Input Voltage (V)
Supply Current vs. Input Voltage
Not Switching
Line Regulation (Movie Mode)
320
300
280
260
240
220
1.5
1.0
0.5
0.0
-0.5
-1.0
3.0
3.4
3.8
4.2
4.6
5.0
3.0
3.4
3.8
4.2
4.6
5.0
Input Voltage (V)
Input Voltage (V)
1.5A Flash Operation
Flash Turn On in Soft-Start
VENF
VENF
VOUT
VIN
VD1
VIN = 3.6V
ID1
ID1
VIN = 3.8V
Time (40ms/div)
Time (1ms/div)
SG Micro Corp
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DECEMBER 2022
5
SGM3785S
2MHz, 1.5A Flash LED Driver
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
TA = +25℃, VIN = 3.6V, L = 1.0μH, CIN = 4.7μF, and COUT = 4.7μF, unless otherwise noted.
Movie Mode Turn On or Off
VENM
VOUT
VD1
ID1
VIN = 3.3V
Time (4ms/div)
SG Micro Corp
www.sg-micro.com
DECEMBER 2022
6
SGM3785S
2MHz, 1.5A Flash LED Driver
FUNCTIONAL BLOCK DIAGRAM
SW
VOUT
Converter
Control and
Gate Drive
Over-Voltage
Protection
PGND
Flash Mode
Thermal
Regulation
Voltage
Reference
Voltage
Sensing
VIN
D1
D2
ENM
ENF
360kΩ
Pull-Down
Resistor
LED Logic,
Timer and
Control
360kΩ
Pull-Down
Resistor
LED Current
Control
RSETM
RSETF
AGND
Figure 1. Functional Block Diagram
SG Micro Corp
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DECEMBER 2022
7
SGM3785S
2MHz, 1.5A Flash LED Driver
STATE DIAGRAM
Power On
Reset
ENF = "0"
ENM = "0"
ENF = "0"
ENM = "0"
Time (tD) ≥ 5ms
ENF = "0"
Shutdown
Mode
ENM = "1"
Time (tM) ≥ 5ms
ENF = "0"
ENF = "0"
ENM = "0"
Time (tD) ≥ 5ms
ENM = PWM Signal
Logic "High" Time of
PWM (tM) ≤ 2.5ms
ENF = "0"
ENM = "0"
Time (tD) ≥ 5ms
Active
Mode
Movie/Torch
Mode
ENF from "0" to "1"
ENM = PWM Signal
ENF from "1" to "0"
or Time Out
ENM = PWM Signal
ENF from "0" to "1"
ENM = PWM Signal
Flash
Mode
Figure 2. State Diagram
SG Micro Corp
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DECEMBER 2022
8
SGM3785S
2MHz, 1.5A Flash LED Driver
TYPICAL APPLICATION OF FLASH MODE
L
1.0μH
Input Voltage
3V to 5V
CIN
2.2μF
Flash LED Up to 1.5A
VOUT
SW
SW
VIN
COUT
4.7μF
VOUT
D1
High
ENF
ENM
Low
Flash Enable
SGM3785S
D2
RSETF
RSETM
PWM Dimming Signal
AGND PGND
RSETM RSETF
Figure 3. Typical Application of Flash Mode
TIMING DIAGRAM OF FLASH MODE
Enter Flash mode and LED current = ISETF × D
670ms Hardware Timer
ENF
ENM
15kHz ≤ fPWM ≤ 200kHz, PWM signal is sent before ENF changed from "Low" to "High" at any time
Figure 4. Timing Diagram of Flash Mode
SG Micro Corp
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DECEMBER 2022
9
SGM3785S
2MHz, 1.5A Flash LED Driver
TYPICAL APPLICATION OF MOVIE/TORCH MODE
L
1.0μH
Input Voltage
3V to 5V
CIN
2.2μF
Movie/Torch LED Up to 400mA
SW
SW
VOUT
VIN
COUT
4.7μF
VOUT
D1
ENF = "Low"
ENF
ENM
SGM3785S
D2
RSETF
RSETM
Movie/Torch Control and PWM Dimming
AGND PGND
RSETM RSETF
Figure 5. Typical Application of Movie/Torch Mode
TIMING DIAGRAM OF MOVIE/TORCH MODE
ENF = "Low"
ENF
Time (tM) ≥ 5ms
PWM signal
tD ≥ 5ms
ENM
Enter Movie/Torch mode and
LED current = ISETM × D
Enter
shutdown
Figure 6. Timing Diagram of Movie/Torch Mode
SG Micro Corp
www.sg-micro.com
DECEMBER 2022
10
SGM3785S
2MHz, 1.5A Flash LED Driver
DETAILED DESCRIPTION
The SGM3785S implements automatic thermal control
when flash mode is programmed. When flash mode is
enabled, device temperature could rise quickly. The
thermal regulation loop will engage when the IC
temperature reaches 100℃. The two channel’s sink
current is automatically reduced. This implementation
effectively prevents the device from triggering thermal
shutdown, which causes LEDs to flicker. Due to this
thermal regulation loop, good thermal PCB layout is
necessary to ensure proper sink current in flash mode
current setting.
The SGM3785S is a fully integrated synchronous Boost
flash LED driver with two independent current sinks to
drive up to two flash LEDs.
The integrated Boost DC/DC converter integrates two
power FETs with 2MHz switching frequency. Discrete
DC/DC converter regulates a fixed output voltage. In
contrast, the SGM3785S adaptively regulates the
output voltage based on the flash LED forward voltage
and current. This method effectively increases the
conversion efficiency by maintaining the minimal output
voltage for proper LED conduction. The Boost
converter regulates the output voltage based on the
LEDs with the highest forward voltage. For higher sink
current applications, two sinks channels could be
shorted together to achieve 1.5A sink capability.
Movie/Torch Mode LED Current
The SGM3785S supports D1 and D2 LED current up to
400mA total in movie/torch mode. The output current
on each channel is matched internally as the flash
mode. An external resistor connected on RSETM pin
programs the maximum movie/torch mode current in
each sink output. Use Equation 3 to calculate the
movie/torch mode sink current.
The SGM3785S offers flexible control interface to
control the flash, movie/torch mode. After power-on,
SGM3785S stays in shutdown mode. One PWM signal
(5μs ≤ tH ≤ 5ms) at ENM pin programs the SGM3785S
to enter active mode, PWM signal will adjust the flash
LED current. Once ENF changed from “0” to “1”, it
enters into Flash mode. The output flashing LED
current is equal to ISETF × D. If SGM3785S is desired to
work in Movie/Torch mode, one long time logic “High”
pulse must be provided at ENM pin. The time of logic
“High” must be larger than 5ms. The falling edge of this
long time pulse will reset the LED current control, and
the LED current will be programmed by the PWM signal
following this long time pulse. The LED current in
Movie/Torch mode is ISETM × D.
ISETM = 6800/RSETM
(3)
The real LED current is dimmed by the PWM signal at
ENM pin, D is the Duty cycle of PWM signal:
IMOVIE (D1) = I MOVIE (D2) = ISETM × D
(4)
A Movie/Torch mode event is initiated by asserting a
long time logic “High” pulse at the ENM pin.
LED Open Protection
The SGM3785S implements LED open protection
when the D1 and D2 channels are shorted together. In
an open fault event, the device controls the loop to
clamp the VOUT at OVP threshold of 5.3V (TYP).
Flash Mode LED Current
The SGM3785S matches the sink current on D1 and
D2 internally. The device supports maximal 1.5A flash
mode LED sink current on D1 and D2. An external
resistor connected on RSETF pin programs the maximum
flash mode current in each sink output. Use Equation 1
to calculate the flash mode sink current.
LED Short Protection
During operation, the SGM3785S implements a 5mA
(TYP) LED sensing current when D1 and D2 channels
are connected together to detect a short event. This
sensing current generates a voltage drop on each LED
to detect a short event. The SGM3785S compares the
VOUT pin and D1/D2 voltages. If the voltage difference
is less than a preset threshold, the IC detects this event
as a short, and the flash/movie mode sink current is
disabled. Care should be taken that some flash LEDs
have large leakage current up to hundreds of μA even it
is not fully turned on. The 5mA sensing current ensures
the proper LED operation and avoids triggering false
LED short event. If the short circuit condition is
removed, the SGM3785S automatically resumes
operation to the programmed current setting.
ISETF = 9000/RSETF
(1)
The real flashing current is dimmed by the PWM signal
at ENM pin, D is the Duty cycle of PWM signal:
IFLASH (D1) = IFLASH (D2) = ISETF × D
(2)
For SGM3785S, there is a 670ms hardware timer,
which will turn off the LED flashing current after this
time expires.
SG Micro Corp
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DECEMBER 2022
11
SGM3785S
2MHz, 1.5A Flash LED Driver
DETAILED DESCRIPTION (continued)
4V ×1.5A 3.5V ×0.25
Single LED Application
(6)
IPEAK(L)
=
+
= 2.6A
Each sink channel of the SGM3785S is well matched
and regulated. For single LED applications, D1 and D2
pins can be shorted together to drive a single LED and
deliver up to 1.5A sink current, as shown in Figure 7.
Each current sink can be calculated by the equations
under Flash Mode LED Current and Movie/Torch Mode
LED Current sections.
0.8×3.5V
2×1
For lower inductance, the inductor peak current will
increase. To ensure proper operation, the inductor peak
current should not exceed the valley PMOS current
limit and the inductor saturation current rating. Care
should be taken to ensure selected inductor does not
saturate at maximum LED sink current, minimum input
voltage and high ambient temperature.
Inductor Selection
The SGM3785S is optimized for 1.0μH to 2.2μH
inductor. The selected inductor should have enough
saturation current rating that is higher than the worst
case peak inductor current given by Equation 5.
Capacitor Selection
A 2.2μF low ESR ceramic capacitor is recommended
as the input capacitor to improve transient response
and EMI performance for high current flash LEDs.
Place the input capacitor as close to the input pin and
the PGND pin of the SGM3785S as possible.
VO(MAX) ×ILED(MAX)
VIN(MIN) × tON(MAX)
IPEAK(L)
=
+
(5)
0.8× V
2×L
IN(MIN)
The desired LED current determines the required
output capacitance. A 2.2μF or 4.7μF ceramic output
capacitor is recommended for most applications.
where 0.8 is the estimated efficiency of 80%.
For 1.5A total current as an example, the peak inductor
current for a 1μH assuming 50% as the worst case duty
cycle, maximum LED forward voltage of 4V and
maximum load current of 1.5A is shown below:
L
1.0μH
Input Voltage
3V to 5V
CIN
2.2μF
Flash LED Up to 1.5A
SW
SW
VOUT
VIN
COUT
4.7μF
VOUT
D1
High
ENF
Low
Flash Enable
SGM3785S
AGND PGND
D2
RSETF
RSETM
ENM
PWM Dimming Signal
RSETM RSETF
Figure 7. Single LED Application
SG Micro Corp
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DECEMBER 2022
12
SGM3785S
2MHz, 1.5A Flash LED Driver
DETAILED DESCRIPTION (continued)
as possible. Wide and short traces can be used to
minimize PCB inductance for current carrying traces.
For Boost converter, the output capacitor’s current loop
from VOUT pin back to the GND pin of the device should
be as small as possible. Figure 8 shows an example of
SGM3785S PCB layout.
PCB Layout
In addition to component selection, layout is a critical
step to ensure the performance of any switching
devices. Poor layout can result in system instability,
EMI failure, and device damage. Thus, place the
inductor, input and output capacitors as close to the IC
Figure 8. Layout Example
REVISION HISTORY
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Original (DECEMBER 2022) to REV.A
Page
Changed from product preview to production data.............................................................................................................................................All
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DECEMBER 2022
13
PACKAGE INFORMATION
PACKAGE OUTLINE DIMENSIONS
TDFN-3×2-14L
D1
D
DETAIL A
N14
E
E1
L
k
N1
e
b
PIN 1#
TOP VIEW
BOTTOM VIEW
C
SEATING PLANE
2.50
A
0.80
1.85
0.40
A2
A1
eee C
SIDE VIEW
0.55
0.20
ALTERNATE A-1 ALTERNATE A-2
DETAIL A
ALTERNATE TERMINAL
CONSTRUCTION
RECOMMENDED LAND PATTERN (Unit: mm)
Dimensions In Millimeters
Symbol
MIN
MOD
MAX
0.800
0.050
A
A1
A2
b
0.700
0.000
-
-
0.203 REF
0.130
2.900
1.900
2.400
0.700
-
0.250
3.100
2.100
2.600
0.900
D
-
E
-
2.500
0.800
0.400 BSC
-
D1
E1
e
k
0.150
0.300
-
L
-
0.400
eee
0.080
NOTE: This drawing is subject to change without notice.
SG Micro Corp
TX00063.001
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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
TDFN-3×2-14L
7″
9.0
2.30
3.30
1.10
4.0
4.0
2.0
8.0
Q1
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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
7″ (Option)
7″
368
442
227
410
224
224
8
18
SG Micro Corp
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TX20000.000
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