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(R)
PRELIMINARY
SP7611A/7612/7614
Low Dropout LED Driver for any Color LED
FEATURES LED Drivers for parallel connected LEDs Ultra Low Dropout Voltage of 150mV (SP7614) No EMI, no switching noise Integrated current matching PWM and Analog brightness control Enable/Shutdown control Shutdown current < 1A Small footprint SC-70 Package
P/N SP7611A SP7612 SP7614 Channel 4 3 2 IBIAS 160 120 160 IBIAS/LED 40 40 80
N/C LED1 CTRL
3
2
1
SP7614
6 Pin SC70
4
GND
5
LED2
6
ON/OFF
Now Available in Lead Free Packaging
APPLICATIONS Next Generation Mobile Phones PDA, DSC, MP3 players Handheld Computers LCD Display Modules Keyboard Backlight LED Displays DESCRIPTION The SP761X driver family provides a simple solution for a matched current source any color LED. The current in the LEDs can be programmed by an external resistor. The Individual LED currents are 200 x ISET, where ISET is the current through the external resistor connected to the CTRL pin. The SP7611A is capable of driving four LEDs, while the SP7612 can drive three LEDs. The SP7614 is designated to drive two high current LEDs. LED1 should always be connected to an LED in order to have the other LEDs driven with a matched current to LED1. The SP7612 and SP7614 have Enable pins. When these devices are disabled, the supply current drops to 0.01A typical. The SP7611A, SP7612 and SP7614 drivers are available in a small footprint 6-pin SC-70 package. TYPICAL APPLICATION SCHEMATIC
VIN
I SET V CONTROL RSET ENABLE
LED1 CTRL
(R)
LED2
SP7614 ON/OFF GND
Date: 6/30/04
SP7611A/7612/7614 Low Dropout LED Driver for Any Color LED
(c) Copyright 2004 Sipex Corporation
1
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. VLED1, VLED2, VLED3, VLED4 and EN Voltage to GND......................................................................................-0.3V to 6V CTRL Voltage to GND . .........................................................................................................................................0.5V Output Current (IOUT).............................................................................................................................................80mA Power Dissipation per Package - 6-pin SC-70 at TA =85C...............................................................................190mW Junction Temperature.........................................................................................................................................+150C Storage Temperature.......................................................................................................................... -55C to +150C ESD Level.......................................................................................................................................................................................................4kV HBM ESD Level.......................................................................................................................................................................................................1kV CDM
ELECTRICAL CHARACTERISTICS
Specifications are at TA=25C, VIN =3.3to 5.5, ENABLE =VIN, denotes the specifications which apply over the full operating temperature range, unless otherwise specified.
PARAMETER LED Cathode Voltage P/N SP7611A SP7612 SP7614 Ambient Temperature SP7614 MIN. 0.3 0.5 0.15 -40 20 85 C 1 V TYP. MAX. UNITS
PARAMETER Output Current Multiplication Ratio (Note 1)
P/N SP7611A SP7612
MIN.
TYP.
MAX.
UNITS
CONDITIONS ISET = 100A VSAT = 300mV ISET = 100A VSAT = 150mV ISET= 100A VSAT = 300mV ISET = 100A VSAT = 150mV No Load VIN = 3V VEN = 0V ISET = 150A
140 SP7614 LED Current ILED (Per Diode) SP7611A SP7612
200
260
20 mA -3 0.8 90 0.01 1 3 0.5 3 % % A V V
SP7614
LED to LED Current Matching Peak Efficiency Current in OFF Mode Min. ENABLE "ON Voltage" Max. ENABLE "OFF Voltage" SP7612 SP7614 SP7612 SP7614
Note 1: Output current Multiplication Ratio (ILED/ISET) is not linear. For actual ratio and ILED please refer to typical performance characteristics @ page 4.
Date: 6/30/04
SP7611A/7612/7614 Low Dropout LED Driver for Any Color LED
(c) Copyright 2004 Sipex Corporation
2
PIN DESCRIPTION
PIN NAME Pin No. SP7611A 1 2 3 4 5 6 ON/OFF ON/OFF Chip ON/OFF/Disable CTRL LED2 LED1 GND LED4 LED3 SP7612 CTRL LED2 LED1 GND LED3 SP7614 CTRL LED1 NC GND LED2 Sets LED Current Connect to Cathode of LED Connect to Cathode of LED Ground Connect to Cathode of LED Connect to Cathode of LED DESCRIPTION
PINOUT
LED1 LED2 CTRL
LED1
LED2
CTRL
3
2
1
3
2
1
SP7611A
6 Pin SC70
SP7612
6 Pin SC70
4
GND
5
LED4
6
LED3
4
GND
5
LED3
6
ON/OFF
N/C
LED1
CTRL
3
2
1
SP7614
6 Pin SC70
4
GND
5
LED2
6
ON/OFF
Date: 6/30/04
SP7611A/7612/7614 Low Dropout LED Driver for Any Color LED
(c) Copyright 2004 Sipex Corporation
3
TYPICAL PERFORMANCE CHARACTERISTICS
ISET versus CTRL Voltage Vk=1V 200.0 180.0 140.0 120.0 100.0 80.0 60.0 40.0 20.0 0.0 0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 Vk=150mV
LED Current versus Enable Voltage
18.000
LED Current (mA)
160.0
Set Current (A)
16.000 14.000 12.000 10.000 8.000 6.000 4.000 2.000 0.000
CTRL Pin Voltage (V)
VEN Voltage (V)
ILED vs Set Resistor and Cathode Voltage
Vk=200mV Vk=250mV Vk=300mV
SP7614 LED Current vs. LED Cathode Voltage
35
20.0 18.0 16.0
LED Current (mA)
LED Current (mA)
14.0 12.0
Vk=100mV
Vk=150mV
30 25 20 15 10 5 0 0.2 0.4 0.6 0.8 1 LED Cathode Voltage (V)
For Iset = 25uA For Iset = 50uA
10.0 8.0
Vk=50mV
6.0 4.0 2.0 10 20 30 40 50 60 70 80 90 100 Set Resistor (kOhms)
PWM LED Current vs. Temperature Iset=100uA, Vcathode=150mV 25 24
ILED(mA)
23 22 21 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 Temperature (C)
Control Voltage Transient Response
[
T
Enable Voltage Transient Response
[
]
T
]
LED Current (20mA/div)
LED Current (20mA/div)
T
T
CTRL Voltage (1V/div)
CTRL Voltage (1V/div)
T
T
Time (1s/div)
Time (1s/div)
Date: 6/30/04
SP7611A/7612/7614 Low Dropout LED Driver for Any Color LED
(c) Copyright 2004 Sipex Corporation
4
APPLICATION INFORMATION
SETTING THE LED CURRENT The current flowing into LEDs is approximately 200 times greater than the current ISET. The LED current is controlled by ICONTROL and RSET according to the following formula: ILED = 200 X (VCONTROL - VCTRL) / RSET For VCONTROL = 3V and a specified LED current, the RSET value can be evaluated using the diagram shown in the Typical Performance Characteristics section. For any other option, ISET vs. VCTRL. The LED's brightness can also be adjusted by driving ENABLE or the CTRL pin with a PWM signal. The driving signal frequency should be greater than 100Hz to avoid flickering, increasing to more than 1MHz, if necessary. LEDs are very sensitive to temperature. In most cases the maximum allowed junction temperature is 100C. This temperature is the result of adding to the ambient temperature the over temperature due to power dissipation, is described by the following: Tj = TA + OjA x I xVF where Tj is the LED junction temperature, TA is the ambient temperature, OjA is the junction to ambient thermal resistance, I is the LED current and VF is the LED forward voltage. The SP7611AA to SP7614 are designed to reduce the current through LEDs, when the temperature rises and the cathode voltage increases, as can be seen from typical the "LED Current vs. LED Cathode Voltage" graph under the Typical Performance Characteristics section. APPLICATION NOTES The ultra-low voltage drop across the SP761X series of LED drivers, allow the devices to drive white, blue, and other color LEDs in a wide range of input voltages. The driver can be used in many applications. Although, only the SP7611A is shown in all three examples, any of the SP762X series of LED drivers can be used in the applications presented in this document, due to their similar operation. Example 1: Drive low VF white or blue LEDs directly from single cell Li-ion When using white or blue low VF LEDs, and utilizing the drivers low voltage drop, only 3.4V in VIN is needed for the full 20mA LED current. At 3.1V, there is still 5mA typical current available for the LEDs. The single cell Li-ion is utilized in most applications like cell phones or digital still cameras. In most cases, the Li-ion battery voltage level only goes down to 3.0V voltage level, and not down to the full discharge level (2.7V) before requesting the charger.
VIN
I SET V CONTROL RSET ENABLE
LED4 CTRL
LED3
LED2
(R)
LED1
SP7611 ON/OFF GND
- TDROP < 0.3V - VF (at 20mA) < 3.1V (Low VF) - VIN (at 20mA) < - VDROP +VF = 3.4V - VIN (at 5mA typical) ~ 3.1V Key Advantages 1) No boost circuit needed for the LCD or keyboard backlight 2) Drivers directly connected to a Li-ion battery 3) No EMI, no switching noise, no boost efficiency lost, no capacitor, and no inductor
The SP761X driver's low dropout architecture can significantly improve the efficiency compared to using simple ballast resistors. The system efficiency, defined as the ratio between the LEDs power and the input supplied power can be calculated as follows: Efficiency = (VIN - VCATHODE) / VIN The lower the VCATHODE , the higher the system efficiency. Efficiency can be further improved using a higher VIN with more LEDs as shown in example 3.
Date: 6/30/04
SP7611A/7612/7614 Low Dropout LED Driver for Any Color LED
(c) Copyright 2004 Sipex Corporation
5
APPLICATION INFORMATION
Example 2: Drive high VF white or blue LEDs from existing bus from 4.0V to 5.5V High VF white or blue LEDs have forward voltage drop in the range of 3.2V to 4.0V. To drive these LEDs with the maximum current of 20mA for maximum brightness, usually requires a boost circuit for a single cell Li-ion voltage range. In some cases, there is already a voltage bus in the system, which can be utilized. Due to the ultralow voltage drop of the SP761X series of LED drivers to drive high VF white or blue LEDs. The VIN needs to be only 300mV higher than the highest VF in the circuit.
VIN
- VDROP < 0.3V - VIN_MIN = N x VF + VDROP - VIN_MIN = N x VF + 5.5V Where VIN = Existing bus, boost Voltage Key Advantages 1) No need for current matching resistors and discrete transistor for brightness control LED Brightness Control All of the SP761X LED Drivers feature analog and PWM controls to give designers flexible brightness control. These control methods can be applied to the circuit in two different ways, to provide more flexibility than any other solution. To determine the value of RSET , use the "ISET vs. VCRTL" graph under the Typical Performance Characteristics. 1. SP7611A
VIN
I SET V CONTROL RSET ENABLE
LED4 CTRL
LED3
LED2
(R)
LED1
SP7611 ON/OFF GND
- TDROP < 0.3V - VF (at 20mA) < 3.3V to 4.0V (High VF) - VIN (at 20mA) = VDROP +VF = 3.6V to 4.3V - VIN (at 5mA typical) ~ 3.3V Where VIN = Existing bus = 3.3V to 4.3V Key Advantages 1) No boost circuit needed for the LCD or keyboard backlight 2) Drivers utilizes existing bus 3) Ultra-low voltage drop provides the full 20mA LED current at the lowest possible voltage level. Example 3: Drive white, blue red, amber LEDs string Assuming boost circuit, or existing voltage bus, the SP761X series of LED drivers can be used to drive a whole string of LEDs and flexible brightness control analog and/or PWM.
V IN
I SET VCONTROL 3V RSET ENABLE
LED4 CTRL
LED3
LED2 LED1
(R)
SP7611 ON/OFF GND
- Analog Set VCONTROL and RSET for LED current ILED = 200 x (VCONTROL - VCNTR) / RSET - PWM VCONTROL = PWM -Amplitude sets maximum LED current -Pulse width controls between 0 and maximum 2. SP7612
VIN
`N'number of LEDs Per Branch
I SET V CONTROL RSET ENABLE
LED4 CTRL
LED3
LED2
(R)
LED1
I SET V CONTROL RSET ENABLE
LED4 CTRL
LED3
(R)
LED1
SP7611 ON/OFF GND
SP7612 ON/OFF GND
Date: 6/30/04
SP7611A/7612/7614 Low Dropout LED Driver for Any Color LED
(c) Copyright 2004 Sipex Corporation
6
APPLICATION INFORMATION
- Analog Set VCONTROL and RSET for LED current 3. SP7614
VIN
- PWM -1
I SET
-ILED = 200 x (VCONTROL - VCTRL) / RSET -Amplitude sets maximum LED current -Pulse width controls between 0 and maximum - PWM -2 Set VCONTROL and RSET for LED current ILED ~ 200 x ISET ON/OFF = PWM -Amplitude has no effect on current -Pulse width controls between 0 and maximum
VCONTROL
RSET ENABLE
LED1 CTRL
(R)
LED2
SP7614 ON/OFF VSS
- Analog Set VCONTROL and RSET for LED current ILED = 200 x (VCONTROL - VCTRL) / RSET - PWM - 1 -Amplitude sets maximum LED current -Pulse width controls between 0 and maximum - PWM - 2 Set VCONTROL and RSET for LED current ILED ~ 200 x ISET ON/OFF = PWM -Amplitude has no effect on current -Pulse width controls between 0 and maximum
Date: 6/30/04
SP7611A/7612/7614 Low Dropout LED Driver for Any Color LED
(c) Copyright 2004 Sipex Corporation
7
PACKAGE: 6 PIN SC-70
D e1
N
N/2 +1 E/2
H B
E
E1/2 E1
B
SEE VIEW C
INDEX AREA (D/2 X E1/2)
1 e
2
N/2
O1
b
Gauge Plane Seating Plane
4X O1
L L1
O L2
VIEW C
Dimensions in (mm) 6 PIN SC-70 JEDEC MO-203 (AB) Variation MIN NOM MAX 0 0.70 0.15 0.08 0.90 1.10 0.10
A1 A A2
A A1 A2 b c D E E1 L L1 L2 O O1
1.00 0.30 0.22
WITH PLATING
SIDE VIEW
b
2.00 BSC 2.10 BSC 1.25 BSC 0.26 0.36 0.42 REF 0.15 BSC 0 4 4 8 12 0.46
BASE METAL
c
6 PIN SC-70
Date: 6/30/04
SP7611A/7612/7614 Low Dropout LED Driver for Any Color LED
(c) Copyright 2004 Sipex Corporation
8
ORDERING INFORMATION
Part Number Temperature Range Package Type
SP7611AEC6 .............................................. -40C to +85C ......................................................... 6 Pin SC-70 SP7611AEC6/TR ........................................ -40C to +85C ......................................................... 6 Pin SC-70 SP7612EC6 ................................................ -40C to +85C ......................................................... 6 Pin SC-70 SP7612EC6/TR .......................................... -40C to +85C ......................................................... 6 Pin SC-70 SP7614EC6 ................................................ -40C to +85C ......................................................... 6 Pin SC-70 SP7614EC6/TR .......................................... -40C to +85C ......................................................... 6 Pin SC-70 Available in lead free packaging. To order add "-L" suffix to part number. Example: SP7614EC6/TR = standard; SP7614EC6-L/TR = lead free /TR = Tape and Reel Pack quantity is 2500 for SC70.
Corporation
ANALOG EXCELLENCE
Sipex Corporation Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others.
Date: 6/30/04
SP7611A/7612/7614 Low Dropout LED Driver for Any Color LED
(c) Copyright 2004 Sipex Corporation
9

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