MPS MP3336 Dual-channel, flash led driver with 2a/ch and i2c interface Datasheet

MP3336
Dual-Channel, Flash LED Driver
with 2A/Ch and I2C Interface
The Future of Analog IC Technology
DESCRIPTION
FEATURES
The MP3336 is a compact, dual-channel, highpower, flash, LED driver that can drive up to 2A in
flash mode for each LED. It is usually applied for
camera phones to improve image and video
quality in low-light environments. The MP3336
operates with a selectable 1/2/3/4MHz switching
frequency and uses a synchronous, current-mode
PWM boost converter to regulate the LED current
with two high-current sources. The MP3336
provides high efficiency and an optimized solution
for smaller PCB spaces.


The MP3336 features a standard I2C interface,
dual LED channels, rich protection modes, and
high power density and performances. The
MP3336 can also support flash, assist, torch,
indicator, and 5V DC modes.
The cathodes of the dual-flash LED are
referenced to GND, which is better for improving
thermal performance in layout. The MP3336 is
available in a WLCSP-20 (1.6mmx2.0mm)
package.
2.7V~5.5V Input Voltage
1/2/3/4MHz Selectable Max Switching
Frequency
 Switching Frequency Fold-back Function
 400kHz I2C Compatible Interface
 Standby/Flash/Assist/Torch/Indicator/5V DC
Modes
Flash Mode
 Up to 2A/Ch Programmable Current with
±7% Accuracy for Each LED, 7.84mA/Step
Assist/Torch Mode
 Up to 319mA/Ch Programmable Current
with ±7% Accuracy for Each LED,
1.25mA/Step
Indicator Mode
 Works in 31.5kHz PWM Dimming Mode with
2/16, 3/16, 4/16, 5/16 Duty Cycle
 Used for Blinking and 128/256/512ms
Selectable Blinking Time
5V DC Mode
 Output Constant 5V DC Voltage
 1A to 4.2A Programmable Input DC Current
Limit Protection
 External Torch/Strobe/TX Pin
 LED Forward-Voltage Balance to Improve
Efficiency
 VIN to VOUT Disconnection Function
 Low-Battery Voltage Protection
 LED Short/Open Protection
 VOUT-GND Short Protection
 Over-Voltage Protection (OVP)
 Over-Temperature Protection (OTP)
 Input Under-Voltage Lockout (UVLO)
Protection
 Available in a WLCSP-20 (1.6mmx2.0mm)
Package
APPLICATIONS



Smartphone Flash LED Application
Cameras for Tablets
Digital Still Camera
All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For
MPS green status, please visit the MPS website under Quality
Assurance. “MPS” and “The Future of Analog IC Technology” are registered
trademarks of Monolithic Power Systems, Inc.
MP3336 Rev.1.01
5/16/2017
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1
MP3336 – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
TYPICAL APPLICATION
MP3336 Rev.1.01
5/16/2017
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2
MP3336 – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
ORDERING INFORMATION
Part Number*
MP3336GC
Package
WLCSP-20 (1.6mmx2.0mm)
Top Marking
See Below
* For Tape & Reel, add suffix –Z (e.g. MP3336GC–Z)
TOP MARKING
EF: Product code of MP3336GC
Y: Year code
LLL: Lot number
PACKAGE REFERENCE
WLCSP-20 (1.6mmx2.0mm)
MP3336 Rev.1.01
5/16/2017
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MP3336 – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
ABSOLUTE MAXIMUM RATINGS (1)
Thermal Resistance
VIN, VSW, VOUT ..................................-0.3V to +6V
NTC ...................................... -0.3V to VIN + 0.3V
All other pins ...................................-0.3V to +6V
Junction temperature ................................150°C
Lead temperature .....................................260°C
(2)
Continuous power dissipation (TA = 25°C)
WLCSP-20 (1.6mmx2.0mm) ...................... 2.3W
WLCSP-20 (1.6mmx2.0mm) …55 ... .0.5.. °C/W
Recommended Operating Conditions
(3)
Supply Voltage (VIN)........................ 2.7V to 5.5V
Operating junction temp. (TJ). .. -40°C to +125°C
MP3336 Rev.1.01
5/16/2017
(4)
θJA θJC
NOTES:
1) Exceeding these ratings may damage the device.
2) The maximum allowable power dissipation is a function of the
maximum junction temperature TJ (MAX), the junction-toambient thermal resistance θJA, and the ambient temperature
TA. The maximum allowable continuous power dissipation at
any ambient temperature is calculated by PD (MAX) = (TJ
(MAX)-TA)/θJA. Exceeding the maximum allowable power
dissipation produces an excessive die temperature, causing
the regulator to go into thermal shutdown. Internal thermal
shutdown circuitry protects the device from permanent
damage.
3) The device is not guaranteed to function outside of its
operating conditions.
4) Measured on JESD51-7, 4-layer PCB.
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4
MP3336 – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
ELECTRICAL CHARACTERISTICS
VIN = 3.6V, TA = 25°C, unless otherwise noted.
Parameters
Symbol
Condition
Min
Typ
Max
Units
5.5
V
Supply
Operating input voltage
Input UVLO threshold
VIN
VIN_UVLO
2.7
Rising edge
Input UVLO hysteresis
Standby current
Shutdown current
Operating quiescent current
2.35
V
160
mV
2
IQ_STANDBY
VIN = 2.7V to 5.5V, I C active
23
μA
IQ_SD
2
μA
IQ
VIN = 2.7V to 5.5V, EN = low
VIN = 3.6V, no switching,
pass mode
fs
SW_FS = 11
1.5
mA
Switching Regulator
Switching frequency
Minimum on time
0.9
tON_MIN
1
1.1
MHz
68
ns
NMOS on resistance
RDSON_N
VIN = 3.6V
45
mΩ
PMOS on resistance
RDSON_P
VIN = 3.6V
60
mΩ
Constant DC output voltage
VOUT_5V
5V DC mode
5
V
3.5
A
0
mA
Inductor current limit
ILIMIT
Code setting = 10,
max duty cycle
LED Driver
Flash current setting
Torch current setting
ILED_FLASH
ILED_TORCH
279
300
0
279
300
mA
mA
321
mA
mV
150
mV
TUP_I = 111
1
μs
TUP_I = 000
8
μs
tRAMP_DOWN
1
μs
VLED_HYS
130
mV
VHD
Current ramp-up step time
tRAMP_UP
Current = 200mA
Input logic low voltage
Input logic high voltage
Strobe/torch/TX pull-down
resistor
321
350
Current source headroom
voltage
Current ramp-down step
time
LED1/2 load balance voltage
hysteresis
Digital Input
Flash mode,
value setting = 00000000
Flash mode,
value setting = 00100110
Assist/torch mode,
value setting = 00000000
Assist/torch mode,
value setting = 11110000
Current = 1250mA(5)
0.4
1.2
V
V
250
kΩ
NOTE:
5) Guaranteed by design.
MP3336 Rev.1.01
5/16/2017
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5
MP3336 – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
ELECTRICAL CHARACTERISTICS (continued)
VIN = 3.6V, TA = 25°C, unless otherwise noted.
Parameters
Symbol
Condition
Min
Typ
Max
Units
Protection
Flash time-out time
tTIMEOUT
Time setting code = 0001
190
200
210
ms
Input DC current limit
ILIMIT_IN
Current setting code = 0010
Over-voltage threshold
LED1/2 short detection
voltage
VOVP
VLED_ST
VOUT short blanking time
TOUT_ST
Thermal shutdown threshold
5.335
5.5
A
5.665
V
1
V
VOUT < 1V
5
ms
VOUT = 1V
250
mA
VLED_OP
110
mV
Tj_SD
150
°C
130
°C
0.6
1.02
3
3.6
V
V
V
V
PMOS charge current
LED1/2 open detection
voltage
1.5
Adaptive thermal threshold
NTC detection voltage
VNTC
Low battery threshold
VBAT_LOW
Code setting = 001
Code setting = 111
Code setting = 000
Code setting = 110
I2C Interface
Input logic low
VIL
Input logic high
VIH
Output logic low
VOL
SCL clock frequency
FSCL
SCL high time
THIGH
0.6
μs
SCL low time
TLOW
1.3
μs
Data setup time
TSU,DAT
100
ns
Data hold time
THD,DAT
0
Setup time for repeated start
TSU,STA
0.6
μs
Hold time for start
THD,STA
0.6
μs
TBUF
1.3
μs
TSU,STO
0.6
μs
Rise time of SCL and SDA
TR
20+0.1*CB
300
ns
Fall time of SCL and SDA
TF
20+0.1*CB
300
ns
TSP
0
50
ns
400
pF
Bus free time between a
start and a stop condition
Setup time for stop condition
Pulse width of suppressed
spike
Capacitance bus for each
bus line
MP3336 Rev.1.01
5/16/2017
0.4
1.3
ILOAD = 3mA
CB
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V
V
0.4
V
400
kHz
0.9
μs
6
MP3336 – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 3.6V, L = 1.1µH, I1/2_TOR = 300mA, I1/2_FL = 400mA, I1/2_TX = 400mA, FL_TIM = 200ms,
two channels, unless otherwise noted.
VSW
2V/div.
VOUT
2V/div.
IL
200mA/div.
VSW
2V/div.
VOUT
2V/div.
VSW
2V/div.
VOUT
2V/div.
IL
200mA/div.
IL
200mA/div.
ILED
200mA/div.
ILED
200mA/div.
ILED
200mA/div.
VSW
2V/div.
VSW
2V/div.
VSTR
2V/div.
VSTR
2V/div.
IL
500mA/div.
IL
500mA/div.
ILED
500mA/div.
ILED
500mA/div.
VSW
2V/div.
VTX
5V/div.
VSW
2V/div.
VSW
2V/div.
VOUT
2V/div.
IL
200mA/div.
ILED
200mA/div.
VSW
2V/div.
VOUT
5V/div.
IL
2A/div.
ILED1
1A/div.
MP3336 Rev.1.01
5/16/2017
VSTR
2V/div.
IL
1A/div.
IL
500mA/div.
ILED
1A/div.
ILED
500mA/div.
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7
MP3336 – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 3.6V, L = 1.1µH, I1/2_TOR = 300mA, I1/2_FL = 400mA, I1/2_TX = 400mA, FL_TIM = 200ms,
two channels, unless otherwise noted.
VSW
2V/div.
VOUT
2V/div.
ILED1
100mA/div.
ILED2
100mA/div.
VSW
2V/div.
VOUT
2V/div.
IL
200mA/div.
IOUT
20mA/div.
VSW
2V/div.
VOUT
2V/div.
IL
500mA/div.
ILED
500mA/div.
VSW
2V/div.
VOUT
2V/div.
VSW
2V/div.
VOUT
2V/div.
IL
500mA/div.
IL
500mA/div.
IL
500mA/div.
ILED
500mA/div.
ILED
500mA/div.
ILED
1A/div.
VSW
2V/div.
VOUT
2V/div.
VSW
2V/div.
VOUT
2V/div.
VOUT
2V/div.
VNTC
2V/div.
IL
500mA/div.
IL
200mA/div.
ILED
200mA/div.
MP3336 Rev.1.01
5/16/2017
ILED
500mA/div.
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8
MP3336 – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
PIN FUNCTIONS
Pin #
Name
Description
A4, B4
LED1
Current source for LED1. Connect the anode of the LED to LED1.
C4, D4
LED2
Current source for LED2. Connect the anode of the LED to LED2.
E4
TX
A3, B3,C3
VOUT
D3
EN
E3
STR
Strobe signal input. STR synchronizes the flash pulse to the image capture. STR is
pulled low internally if left floating.
A2, B2
SW
Boost converter switching node.
C2
TOR
Torch mode input signal. TOR is pulled low internally if left floating.
D2
SCL
I2C interface clock signal.
E2
SDA
I2C interface data.
A1, B1
PGND
Power GND.
C1
AGND
Analog GND.
D1
VIN
E1
NTC
MP3336 Rev.1.01
5/16/2017
Synchronization input signal for RF transmission signal. TX is pulled low internally if
left floating.
Boost converter output.
IC enable.
Input supply. VIN provides power for the internal power and logic circuits. VIN must be
bypassed locally.
LED temperature detection. Connect NTC to a negative thermal coefficient resistor
when in use. Float NTC when not in use.
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MP3336 – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
BLOCK DIAGRAM
Figure 1: Functional Block Diagram
MP3336 Rev.1.01
5/16/2017
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MP3336 – DUAL CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
When the device is enabled by LED_EN, the
synchronous PMOS works with a 250mA
current source first to charge the output
capacitor until VOUT rises above 2.3V. The
device changes to boost switching mode if the
voltage across the current source is less than
the target reference, which is set by VTH_PAS.
If VIN is very close to VOUT, the IC switches to
boost switching mode and pass mode
automatically to minimize power loss. In pass
mode, the synchronous PMOS is fully turned on.
During the current start-up, the current ramps
up step-by-step smoothly until the target setting
current is reached.
OPERATION
The MP3336 is a dual-channel, LED driver with
I2C interface that supports image capture for
camera flash. The MP3336 can work in flash
mode, assist mode, torch mode, indicator mode,
and fixed 5V DC output mode. Table 1 shows
how to set these operation modes.
LED Driver Operation
The MP3336 is a synchronous, current-mode,
PWM, boost converter that can work with
1/2/3/4MHz. The MP3336 regulates the boost
loop by detecting and controlling the headroom
voltage across the current source (VOUTVLED1/2).
Table 1: Operation Mode Setting
Configuration
TX
X
X
X
0
1
X
X
TOR
High
X
X
X
X
X
X
(6)
STR
Float
Float
X
High
High
X
X
LED1/2_EN
1
1
1
1
1
1
X
Mode
STR_MOD
X
X
X
1
1
0
X
5V_MOD
X
X
X
X
X
X
1
LED_MOD
00
10
01
11
11
11
X
Torch
Assist
Indicator
Flash
Flash
Flash
5V
NOTE:
6) STR is high active when STR_POL = 1. STR is low active when STR_POL = 0. Table 1 is based on STR_POL = 1.
Standby Mode
By default, if VIN is higher than UVLO and EN is
pulled high, the device enters standby mode. In
this mode, only the I2C is active and ready to
communicate with the host.
Torch Mode
In standby mode, if TOR goes from low to high,
the device changes to torch mode and the
current ramps up step-by-step to the target
current after setting the LED1/2_EN bits to 1.
The target current for the LED can be set
through registers I1_TOR and I2_TOR. The
ramp-up slew rate can be set by the register
TUP_I. The current can be disabled by pulling
TOR to low or by setting the LED1/2_EN bits to
0. These two bits control the two LED current
sources respectively. By pulling TOR low, the
LED1/2_EN and LED_MOD bits reset to the
default automatically if LED_SD is 0 (see Figure
2).
MP3336 Rev.1.01
5/16/2017
Figure 2: Torch Mode
Assist Mode
To enter assist mode, set the LED_MOD
register to 10 and LED1/2_EN to 1. The current
ramps up to the target value, which is set by
I1_TOR and I2_TOR. The ramp-up slew rate
can be set by register TUP_I. The current can
be disabled by switching to standby mode or by
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MP3336 – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
setting the LED1/2_EN bits to 0. These two bits
control the two LED current sources
respectively (see Figure 3).
works in indicator mode during the blinking time,
and the LED current source is disabled during
the blinking time (see Figure 5). The blinking
time is set by the TBK0-1 bits in register 0FH.
Figure 5: Blinking Time
Figure 3: Assist Mode
Indicator Mode
When LED_MOD is set to 01 and LED_EN1/2
is set to 1, the MP3336 enters indicator mode,
which provides a low-current output (see Figure
4). In this mode, the driver current sources work
in a 31.5kHz PWM dimming mode. The current
amplitude can be set by I1_TOR and I2_TOR,
while the indicator current step ramps up more
quickly at a rate of 7.84mA/step, compared to
torch mode’s ramp-up rate of 1.25mA/step. The
final amplitude in this mode can be calculated
with Equation (1):
7.84mA x I1/2_TOR
(1)
The duty cycle is set by the INDI_PWM register.
When disabled, switch to standby mode or set
the LED1_EN and LED2_EN bits to 0.
Flash Mode
The device can work in flash mode in three
ways: hardware and level trigger mode,
hardware and edge trigger mode, and software
and edge trigger mode. All of the below
description are based on bit STR_POL = 1. The
default high level is active for STR. When
STR_POL is set to 0, STR is low active.
1. Hardware and Level Trigger Mode
In this mode, STR_MOD = 1, STR_LV = 1,
LED1/2_EN = 1, LED_MOD = 11. The flash
current begins to ramp up after STR goes high.
The current is set by I1_FL and I2_FL, and the
ramp-up time is set by TUP_I. The flash current
ends when STR is pulled low or when the flash
timer ends. After flash, LED_MOD is reset to
standby mode, and LED1/2_EN is set to 0 if
LED_SD = 0. If LED_SD = 1, LED_MOD and
LED1/2_EN are not reset. The LED1 and LED2
current sources are controlled by the LED1_EN
and LED2_EN bits respectively. If the STR is
pulled low before the flash timer ends, the flash
current shuts down at the STR falling edge (see
Figure 6). Conversely, if the flash timer set by
FL_TIM ends before STR goes low, the flash
current terminates immediately. The time-out
indicator bit FT_TO is set to 1 and is not
cleared until it is read back or the input power
resets (see Figure 7).
Figure 4: Indicator Mode
In indicator mode, the MP3336 can also work in
blinking mode. If blinking is enabled, the IC
MP3336 Rev.1.01
5/16/2017
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MP3336 – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
LED1 and LED2 current sources are controlled
by the LED1_EN and LED2_EN bits
respectively (see Figure 8).
Figure 6: Hardware and Level Trigger Flash
Mode without Time-Out
Figure 8: Hardware and Edge Trigger Flash Mode
3. Software and Edge Trigger Mode
In this mode, without STR, STR_MOD = 0,
LED1/2_EN = 1, and LED_MOD = 11. The
current is set by I1_FL and I2_FL, and the
ramp-up time is set by TUP_I. The flash current
ends when the flash timer set by FL_TIM ends.
After the flash, the LED_MOD is reset to
standby mode if LED1/2_EN is set to 0 with
LED_SD = 0. If LED_SD = 1, the LED_MOD is
not reset if ILED1/2_EN is set to 0. The LED1
and LED2 current sources are controlled by the
LED1_EN and LED2_EN bits respectively (see
Figure 9).
Figure 7: Hardware and Level Trigger Flash
Mode with Time-Out
2. Hardware and Edge Trigger Mode
In this mode, STR_MOD = 1, STR_LV = 0,
LED1/2_EN = 1, and LED_MOD = 11. The flash
current begins to ramp up after STR goes high.
The current is set by I1_FL and I2_FL, and the
ramp-up time is set by TUP_I. The flash current
ends when the flash timer set by FL_TIM ends.
After the flash, the LED_MOD is reset to
standby mode, and LED1/2_EN is set to 0 if
LED_SD = 0. If LED_SD = 1, the mode and
LED_MOD and LED1/2_EN are not reset. The
MP3336 Rev.1.01
5/16/2017
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13
MP3336 – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
Setting Time
Figure 9: Software and Edge Trigger Flash Mode
Torch Mode to Flash Mode
The MP3336 can switch to flash mode from
torch mode directly when STR goes from low to
high if STR_MOD = 1. After flash, the operation
functions the same way as in flash mode (see
Figure 10).
Figure 11: Assist Mode to Flash Mode
5V DC Output Mode
If 5V_MOD is set to 1, the device can work in a
fixed 5V output mode, and the control loop is
taken over by the voltage loop (see Figure 12).
The LED current sources can still output a
current if the mode conditions are met as
described above. Care must be taken to ensure
that the thermal condition is normal, since 5V
directly powers the LED. It is recommend to set
LED1/2_EN to 0 during 5V mode.
Setting Time
Figure 10: Torch Mode to Flash Mode
Figure 12: 5V DC Mode
Assist Mode to Flash Mode
During assist light mode, the device can switch
to flash mode from assist mode directly when
STR goes from low to high if STR_MOD = 1.
After flash, the operation functions the same
way as in flash mode (see Figure 11).
Maximum Switching Frequency Setting
The maximum switching frequency can be
selected by the SW_FS bits when working in
boost mode. 1 /2 /3 /4MHz can be selected to
optimize efficiency.
MP3336 Rev.1.01
5/16/2017
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14
MP3336 – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
Switching Frequency Fold-back
When the max switching frequency is set to
2/3/4MHz in switching mode, if the voltage
across the current source is larger than the
value set by the register bits VTH_PAS, the IC
switches to 1MHz to improve efficiency and EMI.
With 1MHz, if the voltage across the current
source is still larger than the value set by the
register bits VTH_PAS, the IC can stretch the
frequency down until it reaches about 100kHz
with FS_SD = 0. If the LED load becomes
lighter and the input voltage increases further,
the IC switches to pass mode from 100kHz.
With FS_SD = 1, the IC switches directly to
pass mode from 1MHz.
Load Balancing
To improve efficiency, the device provides load
balancing to prevent unbalanced forward
voltage drops between the dual LEDs (see
Figure 13). To enable this function, the bit
BAL_ON must be set to 1. Supposing VLED1 >
VLED2 + VLED_HYS, the LED1 current drops step
by step while the LED2 current rises step by
step. Finally, |VLED1 - VLED2| < VLED_HYS or
ILED1 < 90%ILED2.
However, the maximum adjustment range of
each LED current is limited to 10%. Because of
the limitation, if there is a large difference
between VLED1 and VLED2, the load balance
function cannot make |VLED1 - VLED2| drop
below VLED_HYS, but it is still helpful to further
reduce the voltage difference and improve
efficiency.
Conversely, if VLED2 > VLED1 + VLED_HYS, the
operation is the same.
Figure 13: Load Balancing
LED Output Current Reduction
When the MP3336 works in flash mode, output
current reduction may occur due to the
following three conditions:
MP3336 Rev.1.01
5/16/2017
1. TX is High
During flash mode, if TX goes from low to high,
the flash current drops to the current set by
I_TX in under 5µs and sets the FT_TX bit to 1.
If TX goes low, the current ramps up to the
flash current again (see Figure 14).
Figure 14: Flash Mode with TX Pulse
2. Input DC Current Limit is Triggered
If the input DC current limit set by IL_DC
register is not sufficient, a current reduction
may occur. The actual current in the IFL_ACT
register can be read back during flash.
Input DC Current Limit Protection
The MP3336 uses the input DC current limit
protection to avoid drawing too much current
from the battery. This current limit can be
programmed by the IL_DC register from 1A to
4.2A with 250mA/step when IL_DC < 3A and
with 300mA/step when IL_DC > 3A. If the input
current hits the input current limit threshold, the
LED output current stops and holds until the
input current limit drops below the current limit
threshold. The fault bit FT_IDC is set to 1 if the
input current limit is triggered. The fault bit
remains until it is read back or the input power
is reset. The input current limit protection is
useful in boost mode because it senses the
current of the low-side MOSFET.
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15
MP3336 – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
3. Low Battery Voltage Threshold Is
Triggered
During flash pulse, if the battery voltage drops
below the threshold set by VBL_RUN, the
current reduces step by step until the battery
voltage rises up to the set low battery voltage
threshold. The actual current in the IFL_ACT
register can read back during flash and the
minimum current caused by the current
reduction in IFL_MIN can be read back after
flash.
Low Battery Voltage Protection
The device provides low battery voltage
protection in flash mode in the following ways:
1. Before flash, if VBL_SD = 1, and the input
voltage is lower than the threshold set by
VBL_RUN, the device remains disabled and
sets the fault bit FT_VBATL to 1. If VBL_SD
= 0, the device ramps to the current set by
I_TX and sets the fault bit FT_VBATL to 1.
The fault bit is cleared after it is read back
or when the input power resets.
2. During flash start-up, if the input voltage is
lower than the threshold set by VBL_RUN,
the current stops ramping. The fault bit
FT_VBATL is set. During flash pulse, if the
input voltage is lower than the threshold set
by VBL_RUN, the current ramps down step
by step. The fault bit is set until it is read
back or when the input power resets.
After flash, the minimum current caused by
the current reduction can be read back
through the IFL_MIN register. The IFL_MIN
value holds until the next flash occurs or
until the power resets. The actual current
can be read back through IFL_ACT during
flash. This function is useful for determining
how much flash current can be drawn from
the battery (see Figure 15).
Figure 15: Pre-Flash under Low Battery
NTC Detection
If the register NTC_WD is set to enable NTC
detection, the NTC sources a constant 35µA
current. If the voltage across the NTC resistor
drops below the threshold set by NTC_WD, the
internal fault bit FT_LEDHOT is set to 1 and the
modes are reset to standby mode if LEDT_SD
= 1. If LEDT_SD = 0, the mode setting is not
reset after the fault bit is set. The fault bit
remains until it is read back or the power resets.
It is recommended to float NTC if this function is
not being used.
Figure 16: NTC Detection
VOUT-GND Short Protection
If VOUT < 1V, the device stops switching and
disconnects the synchronous PMOS to prevent
a large current from being drawn from the
battery. Set the FT_VOSC bit to 1 and reset the
mode setting. The fault bit remains until it is
read back or the power resets.
LED1/2-GND Short Protection
If LED1 < 1V and ILED1 > 5mA, or LED2 <
1Vand ILED2 > 5mA, the IC marks off the
current source and sets the fault bit FT_LEDSC
but continues switching. If both current sources
are marked off, the device stops switching and
the mode setting is reset. The fault bit
FT_LEDSC is 1 until it is read back or the
power resets. If LED_EN1 is set to 0, the
feedback of the current source 1 is not involved
MP3336 Rev.1.01
5/16/2017
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16
MP3336 – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
in the loop control, and fault detections on this
channel are also disabled.
LED1/2 Open Protection
If VOUT - VLED1/2 < 110mV and VOUT > 5.5V,
the IC marks off the fault current source and
sets the fault bit FT_OVP but continues
switching. If both current sources are marked
off, the device stops switching and the mode
setting is reset. The fault bit FT_OVP is 1 until it
is read back or the power resets. If LED_EN1 is
set to 0, the feedback of the current source 1 is
not involved in loop control, and fault detection
on this channel is also disabled.
Output Over-Voltage Protection (OVP)
I2C Interface Register Description
I2C Chip Address
After the start condition, the I2C-compatible
master sends a seven-bit address followed by
an eighth read (Read: 1) or write (Write: 0) bit.
The following bit indicates the register address
to or from which the data is written or read. The
I2C address of the MP3336 is 0x27.
I2C Compatible Device Address
If VOUT > 5.5V, the device stops switching and
resumes normal condition until VOUT drops
below 5.2V. The fault bit FT_OVP is 1 until it is
read back or the power resets.
Junction Over-Temperature Protection
If LED_OTAD = 1, the flash current drops to the
current set by I_TX when TJ > 130°C. The fault
bit FT_OTP is set to 1. If TJ > 150°C, the device
stops switching and resets LED_MOD and
LED_EN1/2. The fault bit FT_OTP must be
cleared to 0 by a read-back or a power reset.
Time-Out Protection
If the device works in one of the flash modes—
hardware and level trigger mode—time-out
protection may be triggered. When the STR
input pulse is longer than the flash timer set by
FL_TIM, the device is disabled once the timer
ends. The device stops switching and resets
the mode setting, and the fault bit is 1 until it is
read back or the power is reset before
restarting.
Under-Voltage Lockout (UVLO) Protection
If VIN drops below the UVLO threshold, the
device stops and all of the registers are reset to
default.
MP3336 Rev.1.01
5/16/2017
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17
MP3336 – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
Register Mapping
Add
Reg
D7
D6
D5
D4
D3
D2
D1
D0
00H
Chip ID
DEV_ID4
DEV_ID3
DEV_ID2
DEV_ID1
DEV_ID0
REV_ID2
REV_ID1
REV_ID0
01H
Mode
STR_LV
STR_MOD
STR_POL
LED1_EN
LED2_EN
LED_MOD1
LED_MOD0
5V_MOD
02H
Peak
current
NTC_WD2
NTC_WD1
NTC_WD0
IL_PEAK1
IL_PEAK0
FS_SD
BAL_ON
NA
03H
Flash
timer
FL_TIM3
FL_TIM2
FL_TIM1
FL_TIM0
LED_SD
LEDT_SD
SW_FS1
SW_FS0
04H
Low
battery
voltage
VBL_RUN2
VBL_RUN1
VBL_RUN0
VBL_SD
IL_DC3
IL_DC2
IL_DC1
IL_DC0
05H
Indicator
LED_OTA
D
TUP_I2
TUP_I1
TUP_I0
VTH_PAS 1
VTH_PAS2
INDI_PWM1
INDI_PWM0
I1_FL7
I1_FL6
I1_FL5
I1_FL4
I1_FL3
I1_FL2
I1_FL1
I1_FL0
I2_FL7
I2_FL6
I2_FL5
I2_FL4
I2_FL3
I2_FL2
I2_FL1
I2_FL0
I1_TX7
I1_TX6
I1_TX5
I1_TX4
I1_TX3
I1_TX2
I1_TX1
I1_TX0
I2_TX7
I2_TX6
I2_TX5
I2_TX4
I2_TX3
I2_TX2
I2_TX1
I2_TX0
IFL_ACT7
IFL_ACT6
IFL_ACT5
IFL_ACT4
IFL_ACT3
IFL_ACT2
IFL_ACT1
IFL_ACT0
IFL_MIN7
IFL_MIN6
IFL_MIN5
IFL_MIN4
IFL_MIN3
IFL_MIN2
IFL_MIN1
IFL_MIN0
I1_TOR7
I1_TOR6
I1_TOR5
I1_TOR4
I1_TOR3
I1_TOR2
I1_TOR1
I1_TOR0
I2_TOR7
I2_TOR6
I2_TOR5
I2_TOR4
I2_TOR3
I2_TOR2
I2_TOR1
I2_TOR0
FT_VBATL
FT_OVP
FT_VOSC
FT_LEDSC
FT_OTP
FT_TO
FT_TX
FT_IDC
TBK1
TBK0
NA
NA
BAL_1AB2
BAL_2AB1
FT_LEDHOT
FT_LEDOP
06H
07H
08H
09H
0AH
0BH
0CH
0DH
0EH
0FH
LED1
flash
current
LED2
flash
current
TX1MAS
K current
TX2MAS
K current
Actual
flash
Minimum
flash
LED1
torch
LED2
torch
Fault
indication
Fault
indication
Table 2: Chip ID Register
Addr: 0x00
Bit
Bit Name
Access
Default
Description
2:0
REV_ID
R
011
Revision ID.
7:3
DEV_ID
R
00111
MP3336 Rev.1.01
5/16/2017
Device ID.
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MP3336 – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
Table 3: Mode Setting Register
Addr: 0x01
Bit
Bit Name
Access
Default
7
STR_LV
RW
1
6
STR_MOD
RW
1
5
STR_POL
RW
1
4
LED1_EN
RW
0
3
LED2_EN
RW
0
2:1
LED_MOD
RW
00
0
5V_MOD
RW
0
Description
Flash mode trigger mode with strobe pin signal.
0 = edge sensitive
1 = level sensitive
Strobe pin enable bit.
0 = software enable
1 = hardware enable
Strobe pin signal input active polarity.
0 = active low
1 = active high
LED1 current source enable bit.
0 = LED current sink disable
1 = enable
LED2 current source enable bit.
0 = LED current sink disable
1 = enable
Device mode setting bits.
00 = standby/torch mode
01 = indicator mode
10 = assist mode
11 = flash mode
5V DC output enable bit.
0 = disable
1 = enable
Table 4: NTC Detection and Current Limit Setting Register
Addr: 0x02
Bit
Bit Name
Access
Default
7:5
NTC_WD
RW
000
4:3
IL_PEAK
RW
01
2
FS_SD
RW
0
1
BAL_ON
RW
0
0
NA
RW
NA
MP3336 Rev.1.01
5/16/2017
Description
NTC pin detection window.
000 = off
001 = 0.6V
010 = 0.67V
……
111 = 1.02V
Inductor current limit setting bits.
00 = 2A
01 = 2.5A
10 = 3.5A
11 = 4.5A
Disable switching frequency stretching down from 1MHz if VIN is
close to VOUT.
0 = enable FS stretching down function
1 = disable FS stretching down function
Load balance matching enable bit.
0: LED voltage mismatch auto-balance disabled
1: LED voltage mismatch auto-balance enabled
Reserved.
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19
MP3336 – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
Table 5: Flash Timer Setting Register
Addr: 0x03
Bit
Bit Name
Access
Default
7:4
FL_TIM
RW
0001
3
LED_SD
RW
0
2
LEDT_SD
RW
0
1:0
SW_FS
RW
00
Description
Flash timer setting bits. 100ms to 1600ms, 100ms/step.
0000 = 100ms
0001 = 200ms
…….
1111 = 1600ms
LED_MOD and LED1/2_EN resetting control bit.
0 = reset LED_MOD and LED1/2_EN to default value
after flash or torch
1 = no reset
LED_MOD and LED1/2_EN resetting control bit when
NTC fault occurs.
0 = no reset and device continues
1 = reset and device stops
Max Switching frequency setting bits.
00 = 4MHz
01 = 3MHz
10 = 2MHz
11 = 1MHz
Table 6: Low Battery Voltage Setting Register
Addr: 0x04
Bit
Bit Name
Access
Default
7:5
VBL_RUN
RW
111
4
VBL_SD
RW
1
3:0
IL_DC
RW
0100
MP3336 Rev.1.01
5/16/2017
Description
Low battery voltage setting bits. If VIN drops blow this
voltage during start-up, the current ramping stops. If,
during flash current pulse, the current is decreased until
VIN is higher than its threshold. It works only in flash
mode. 0.1V per step.
000 = 3V
001 = 3.1V
……
110 = 3.6V
111 = disabled
1 = device disabled when VIN is less than the threshold
set by VBL_RUN before flash
0 = enable and current ramps up to current set by I_TX
Input DC current limit setting bits. 1A to 4.2A.
1A to 3A: 250mA/step
0000 = 1A
......
1000 = 3A
>3A: 300mA/step
1001 = 3.3A
......
1100 = 4.2A
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20
MP3336 – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
Table 7: Indicator Register
Addr: 0x05
Bit
Bit Name
Access
Default
7
LED_OTAD
RW
0
6:4
TUP_I
RW
001
3:2
VTH_PAS
RW
01
1:0
INDI_PWM
RW
00
Description
Adaptive thermal flash current control bit.
1 = current reduces to the current set by I_TX when TJ >
130°C
0 = disable when TJ > 150°C
Current ramp-up time per step.
000 = 8µs
001 = 7µs
……
111 = 1µs
Define the threshold when FS drops down to 1MHz or
switches to pass mode from boost mode.
00 = 300mV
01 = 450mV
10 = 600mV
11 = 750mV
PWM duty cycle of 31.5kHz in indicator mode.
00 = 2/16
01 = 3/16
10 = 4/16
11 = 5/16
Table 8: LED1 Flash Current Setting Register
Addr: 0x06
Bit
Bit Name
7:0
I1_FL
Access
RW
Default
00110011
Description
LED1 flash current setting bits. 0 to 2000mA,
7.84mA/step (default 00110011 = 400mA).
00000000 = 0mA
......
11111111 = 2000mA
Table 9: LED2 Flash Current Setting Register
Addr: 0x07
Bit
Bit Name
7:0
MP3336 Rev.1.01
5/16/2017
I2_FL
Access
RW
Default
00110011
Description
LED2 flash current setting bits. 0 to 2000mA,
7.84mA/step (default 00110011 = 400mA).
00000000 = 0mA
......
11111111 = 2000mA
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21
MP3336 – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
Table 10: TX Current Setting Register for LED1
Addr: 0x08
Bit
Bit Name
7:0
I1_TX
Access
RW
Default
00110011
Description
Define the LED1 flash current in flash mode if TX is
high. 0 to 2000mA, 7.84mA/step (default 00110011 =
400mA).
00000000 = 0mA
......
11111111 = 2000mA
Table 11: TX Current Setting Register for LED2
Addr: 0x09
Bit
Bit Name
7:0
I2_TX
Access
RW
Default
00110011
Description
Define the LED2 flash current in flash mode if TX is
high. 0 to 2000mA, 7.84mA/step (default 00110011 =
400mA).
00000000 = 0mA
......
11111111 = 2000mA
Table 12: Actual Flash LED Current Register
Addr: 0x0A
Bit
Bit Name
7:0
IFL_ACT
Access
R
Default
00000000
Description
The actual flash current in flash mode. 0 to 2000mA,
7.84mA/step.
00000000 = 0mA
......
11111111 = 2000mA
Table 13: Minimum Flash LED Current Register
Addr: 0x0B
Bit
Bit Name
7:0
MP3336 Rev.1.01
5/16/2017
IFL_MIN
Access
R
Default
00000000
Description
The minimum flash current caused by low battery
voltage current reduction in flash mode. 0 to 2000mA,
7.84mA/step.
00000000 = 0mA
……
11111111 = 2000mA
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22
MP3336 – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
Table 14: LED1 Torch Current/Indicator Amplitude Setting Register
Addr: 0x0C
Bit
7:0
Bit Name
I1_TOR
Access
RW
Default
00010101
Description
In torch mode: LED1 current setting bits. 0 to
319mA, 1.25mA/step (default 00010101 = 26mA).
00000000 = 0mA
......
11111111 = 319mA
In indicator mode: LED1 current amplitude.
7.84mA/step (default 00010101 = 165mA).
00000000 = 0mA
00000001 = 7.84mA......
Table 15: LED2 Torch Current/Indicator Amplitude Setting Register
Addr: 0x0D
Bit
7:0
MP3336 Rev.1.01
5/16/2017
Bit Name
I2_TOR
Access
RW
Default
00010101
Description
In torch mode: LED2 current setting bits. 0 to
319mA, 1.25mA/step (default 00010101 = 26mA).
00000000 = 0mA
......
11111111 = 319mA
In indicator mode: LED2 current amplitude.
7.84mA/step (default 00010101 = 165mA).
00000000 = 0mA
00000001 = 7.84mA......
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23
MP3336 – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
Table 16: Fault and Flag Indication Register
Addr: 0x0E
Bit
Bit Name
Access
Default
7
FT_VBATL
R
0
6
FT_OVP
R
0
5
FT_VOSC
R
0
4
FT_LEDSC
R
0
3
FT_OTP
R
0
2
FT_TO
R
0
1
FT_TX
R
0
0
FT_IDC
R
0
Description
Low battery voltage fault bit.
0 = no fault
1 = fault
Output over-voltage fault bit.
0 = no fault
1 = fault
VOUT-GND short fault bit.
0 = no fault
1 = fault
LED short fault bit.
0 = no fault
1 = fault
Junction over-temperature fault bit.
0 = no fault
1 = fault
Flash time-out indicator bit.
0 = no fault
1 = fault
TX high indicator bit.
0 = no fault
1 = fault
Input DC current limit fault bit.
0 = no fault
1 = fault
Table 17: Fault Indication and Blink Time Setting Register
Addr: 0x0F
Bit
Bit Name
Access
Default
Description
7:6
TBK
R/W
01
Blinking time setting bits in indicator mode.
00: no blinking, LED remains on
01: Tblink = 128ms
10: Tblink = 256ms
11: Tblink = 512ms
5:4
NA
R
NA
Reserved.
3
BAL_1AB2
R
0
2
BAL_2AB1
R
0
1
FT_LEDHOT
R
0
0
FT_LEDOP
R
0
MP3336 Rev.1.01
5/16/2017
1: VLED1 ≥ VLED2 + 130mV
0: VLED1 < VLED2 + 130mV
1: VLED2 ≥ VLED1 + 130mV
0: VLED2 < VLED1 + 130mV
NTC fault bit.
0 = no fault
1 = fault
LED open fault bit.
0 = no fault
1 = fault
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24
MP3336 – DUAL-CHANNEL, FLASH, LED DRIVER WITH I2C INTERFACE
APPLICATION INFORMATION
Selecting the Output Capacitor
Selecting the Input Capacitor
The output capacitor keeps the output voltage
ripple small and ensures feedback loop stability.
The output capacitor impedance must be low at
the switching frequency. Ceramic capacitors with
X7R dielectrics are recommended for their low
ESR characteristics. Ensure that the ceramic
capacitance is dependent on the voltage rating.
The DC bias voltage and the value can lose as
much as 50% of their capacitance at the rated
voltage rating. Ensure that enough of a voltage
rating margin is left when selecting the
component. A capacitance that is too low can
cause loop instability. For most applications, a
10μF ceramic capacitor is sufficient.
The input capacitor reduces the surge current
drawn from the input supply and the switching
noise from the device. The input capacitor
impedance at the switching frequency should be
less than the input source impedance to prevent
the high-frequency switching current from
passing through to the input. Ceramic capacitors
with X5R or X7R dielectrics are recommended
for their low ESR and small temperature
coefficients. A capacitor with a higher value can
help reduce input voltage ripple and noise. For
most applications, a 10μF ceramic capacitor is
sufficient.
Selecting the Inductor
The converter requires an inductor to supply a
higher output voltage while being driven by the
input voltage. An inductor with a larger value
results in less ripple current, a lower peak
inductor current, and reduced stress on the
internal N-channel MOSFET, but also has a
larger physical size, higher series resistance, and
lower saturation current.
Choose an inductor that does not saturate under
the worst-case load conditions. Select the
minimum inductor value to ensure that the boost
converter works in continuous conduction mode
with high efficiency and good EMI performance.
Calculate the required inductance value using
Equation (2) and Equation (3):
L
η  VOUT  D  (1 D)2
2  fSW  ILOAD
D  1
VIN
VOUT
PCB Layout Guidelines
Efficient PBC layout is critical for stable operation.
For best results, follow the guidelines below.
1. Place a ceramic capacitor close to VIN.
2. Use a wider copper wire for input, output, and
GND to improve thermal performance.
3. Put as many vias close to GND at the output
and input capacitors as possible to improve
thermal performance.
(2)
(3)
Where VIN and VOUT are the input and output
voltages, fSW is the switching frequency, ILOAD is
the LED load current, and η is the efficiency.
The switching current is used for peak-current
mode control. To avoid hitting the current limit,
the worst-case inductor peak current should be
less than 80% of the current-limit ILIM. For most
applications, 0.47µH~2µH inductor is sufficient.
MP3336 Rev.1.01
5/16/2017
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25
MP3336 – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
TYPICAL APPLICATION CIRCUIT
Figure 17: Dual-Channel Application Circuit
MP3336 Rev.1.01
5/16/2017
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26
MP3336 – DUAL-CHANNEL, FLASH LED DRIVER WITH I2C INTERFACE
PACKAGE INFORMATION
WLCSP20 (1.6mmx2.0mm)
PIN 1 ID
PIN 1 ID
MARKING
PIN 1 ID
INDEX AREA
BOTTOM VIEW
TOP VIEW
SIDE VIEW
NOTE:
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) BALL COPLANARITY SHALL BE 0.05
MILLIMETER MAX.
3) JEDEC REFERENCE IS MO-211.
5) DRAWING IS NOT TO SCALE.
RECOMMENDED LAND PATTERN
NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications.
Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS
products into any application. MPS will not assume any legal responsibility for any said applications.
MP3336 Rev. 1.01
5/16/2017
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27