SGM3785 [SGMICRO]
2MHz, 1.5A Flash LED Driver;
| 型号： | SGM3785 |
| 厂家： | 
Shengbang Microelectronics Co, Ltd |
| 描述： | 2MHz, 1.5A Flash LED Driver |
| 文件： | 总13页 (文件大小：553K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SGM3785
2MHz, 1.5A Flash LED Driver
GENERAL DESCRIPTION
FEATURES
The SGM3785 is a highly integrated boost DC/DC
converter with 2MHz fixed frequency. High switching
frequency makes it easy to use tiny components and
optimized for portable photo flash. The SGM3785 is
ideal for high power flash LEDs which are suited for
mobile phone camera modules and digital still cameras.
● Input Voltage Range: 3V to 5V
● Up to Total 1.5A or Each 0.75A 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 SGM3785 offers excellent flexibility to enter flash
mode and movie/torch mode through the ENF and
ENM pins respectively. Flash mode is usually used with
660ms 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
● 660ms Flash Timer Control
● 330kΩ 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. It can prevent the
device from triggering thermal shutdown and provide
the maximum LED output current continuously.
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 SGM3785 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 SGM3785 is available in a Green TDFN-3×2-14L
package. It operates over an ambient temperature
range of -40℃ to +85℃.
SG Micro Corp
JANUARY 2019 – REV. A. 4
www.sg-micro.com
SGM3785
2MHz, 1.5A Flash LED Driver
PACKAGE/ORDERING INFORMATION
SPECIFIED
PACKAGE
DESCRIPTION
ORDERING
NUMBER
PACKAGE
MARKING
PACKING
OPTION
MODEL
TEMPERATURE
RANGE
3785DP
XXXXX
SGM3785
TDFN-3×2-14L
SGM3785YTDP14G/TR
Tape and Reel, 3000
-40℃ to +85℃
MARKING INFORMATION
NOTE: XXXXX = Date Code and Vendor Code.
X X X X X
Vendor Code
Date Code - Week
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 6.5V
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.................................................... 75℃/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.............................................................................2000V
MM.................................................................................200V
RECOMMENDED OPERATING CONDITIONS
Operating 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
JANUARY 2019
2
SGM3785
2MHz, 1.5A Flash LED Driver
PIN CONFIGURATION
SGM3785 (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 330kΩ pull-down resistor to AGND. Regardless of ENM,
only when ENF = “High”, flash mode is in 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
Movie/Torch Mode Enable Pin and Flash Mode PWM Dimming Pin. This pin has an internal 330kΩ
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 in
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 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 connected 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 connected together
to sink total 1.5A.
Exposed
Pad
Exposed Pad. Connect to ground for electrical and thermal usage. Exposed pad is internally
connected to analog ground pin.
AGND
SG Micro Corp
www.sg-micro.com
JANUARY 2019
3
SGM3785
2MHz, 1.5A Flash LED Driver
ELECTRICAL CHARACTERISTICS
(VIN = VEN = 3.6V, TA = +25℃, unless otherwise specified.)
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
2.18
2.4
0.2
340
0.1
2.62
V
IQ
Not switching
450
1
μA
μA
Supply Current in Shutdown
Boost Converter
ISHDN
ENF = ENM = GND
Peak NMOS Current Limit
Oscillator Frequency
ILIM
fS
VOVP
tS
3.4
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
1.5
225
mA
A
ENM = HIGH, RSETM = 71.5kΩ, D1 + D2, TA = +25℃
ENF = HIGH, ENM = GND,
Total Output Current, Flash Mode
Output Current Matching (1)
1.32
1.68
RSETF = 11.5kΩ, D1 + D2, TA = +25℃
ID
1.5
0.7
2.5
12
10
%
%
100mA each channel, TA = +25℃, Movie/Torch mode
750mA each channel, TA = +25℃, Flash mode
LED Short Checking Current
ISHORT
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
0.6
V
V
VIH
1.5
RPD(ENF)
RPD(ENM)
330
330
150
28
kΩ
kΩ
℃
℃
Delay Time to Shutdown Status in Movie/Torch Mode (for PWM Dimming LED Current)
Delay Time
tD
5
ms
ms
Flash Timer
Hardware Flash Timer
tTIME
600
800
Delay Time of ENM = "High" to Enter Movie/Torch Mode
Delay Time
(Entering Movie/Torch Mode)
tM
5
5
ms
Minimum Time of Logic "High" of PWM Signal
Minimum Time of Logic “High” of PWM Signal
tH
μs
NOTE:
1. The current matching between channels is defined as |ID1 - ID2|/(ID1 + ID2).
SG Micro Corp
www.sg-micro.com
JANUARY 2019
4
SGM3785
2MHz, 1.5A Flash LED Driver
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs. Input Voltage
Switching Frequency vs. Input Voltage
100
94
88
82
76
70
2.2
2.1
2
1.9
1.8
1.7
— 0.1A VLED = 2.8V — 0.2A VLED = 3V
— 0.4A VLED = 3.3V — 0.6A VLED = 3.5V
— 0.8A VLED = 3.7V — 1.0A VLED = 4.1V
— 1.2A VLED = 4.3V
3
3.4
3.8
4.2
4.6
5
3
3.4
3.8
4.2
4.6
5
Input Voltage (V)
Input Voltage (V)
Supply Current vs. Input Voltage
Not Switching
Line Regulation (Movie Mode)
400
370
340
310
280
250
1.5
1
0.5
0
-0.5
-1
-1.5
3
3.4
3.8
4.2
4.6
5
3
3.4
3.8
4.2
4.6
5
Input Voltage (V)
Input Voltage (V)
1.5A Flash Operation
Flash Turn On in Soft-Start
VENF
VENF
VOUT
VIN
VIN = 3.6V
VD1
ID1
ID1
VIN = 3.8V
Time (40ms/div)
Time (1ms/div)
SG Micro Corp
www.sg-micro.com
JANUARY 2019
5
SGM3785
2MHz, 1.5A Flash LED Driver
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Movie Mode Turn On or Off
VENM
VOUT
VD1
ID1
VIN = 3.3V
Time (4ms/div)
SG Micro Corp
www.sg-micro.com
JANUARY 2019
6
SGM3785
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
SG Micro Corp
www.sg-micro.com
JANUARY 2019
7
SGM3785
2MHz, 1.5A Flash LED Driver
TYPICAL APPLICATION OF FLASH MODE
L
1.0μH
Input Voltage
3V to 5V
Flash LEDs
Up to 0.75A Each Channel
VOUT
CIN
2.2μF
SW
SW
VIN
COUT
4.7μF
VOUT
D1
High
ENF
ENM
Low
Flash Enable
SGM3785
D2
RSETF
RSETM
PWM Dimming Signal
AGND PGND
RSETM RSETF
TIMING DIAGRAM OF FLASH MODE
Enter Flash mode and LED current = ISETF × D
660ms Hardware Timer
ENF
ENM
15kHz ≤ fPWM ≤ 200kHz, PWM signal is sent before ENF changed from "Low" to "High" at any time
SG Micro Corp
www.sg-micro.com
JANUARY 2019
8
SGM3785
2MHz, 1.5A Flash LED Driver
TYPICAL APPLICATION OF MOVIE/TORCH MODE
L
1.0μH
Input Voltage
3V to 5V
Flash LEDs
Up to 0.75A Each Channel
CIN
2.2μF
SW
SW
VOUT
VIN
COUT
4.7μF
VOUT
D1
ENF = "Low"
ENF
ENM
SGM3785
D2
RSETF
RSETM
Movie/Torch Control and PWM Dimming
AGND PGND
RSETM RSETF
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
SG Micro Corp
JANUARY 2019
www.sg-micro.com
9
SGM3785
2MHz, 1.5A Flash LED Driver
REVISION HISTORY
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
JANUARY 2019 ‒ REV.A.3 to REV.A.4
Added Package Thermal Resistance...................................................................................................................................................................2
NOVEMBER 2014 ‒ REV.A.2 to REV.A.3
Updated Functional Description section.............................................................................................................................................................11
SEPTEMBER 2014 ‒ REV.A.1 to REV.A.2
Updated Electrical Characteristics section...........................................................................................................................................................4
Updated Functional Description section.............................................................................................................................................................11
AUGUST 2014 ‒ REV.A to REV.A.1
Updated Functional Description section.............................................................................................................................................................12
Changes from Original (MARCH 2014) to REV.A
Changed from product preview to production data.............................................................................................................................................All
SG Micro Corp
www.sg-micro.com
JANUARY 2019
10
PACKAGE INFORMATION
PACKAGE OUTLINE DIMENSIONS
TDFN-3×2-14L
NOTE: All linear dimensions are in millimeters.
SG Micro Corp
TX00063.000
www.sg-micro.com
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
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
7″ (Option)
7″
368
442
227
410
224
224
8
18
SG Micro Corp
www.sg-micro.com
TX20000.000
相关型号：
SGM3803
90% Efficient Synchronous Step-Up Converter with 200mA Negative Charge Pump Inverter
SGMICRO
©2020 ICPDF网 联系我们和版权申明