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PDF SC604A Data sheet ( Hoja de datos )

Número de pieza SC604A
Descripción Low Noise - High Efficiency Regulated White LED Driver
Fabricantes Semtech 
Logotipo Semtech Logotipo



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No Preview Available ! SC604A Hoja de datos, Descripción, Manual

POWER MANAGEMENT
ODBesJEcrCipTtIVioEn -NOVEMBER
T9h,e2S0C60004A is a very high efficiency charge pump white
LED driver driver from the mAhXLifeTM family of products,
optimized for Li-Ion battery applications.
The four (4) LED outputs are current matched for consis-
tent LED brightness. Extremely low battery current is
achieved by automatically reconfiguring the charge pump
to match circuit conditions. Using four LEDs, each at
20mA for a total IOUT= 80mA, the SC604A can use less
than 83mA from the supply for most of the battery life.
Patented low noise mode switching circuitry and constant
output current allow the use of extremely small input and
output capacitors.
SC604A
Low Noise, High Efficiency
Regulated Whwwitwe.DaLtaESheDet4UD.croimver
Features
Very high efficiency over 90% of battery life
Peak efficiency over 92%
Current regulation for up to 4 LEDs
Digital 3 bit output control logic
Current matching tolerance of ±3% typical
Wide current range per LED [0.5mA - 30mA]
High available total LED current = 4
Low Shutdown Current: 1µA typical
ILED = 120mA
Soft start / In-rush current limiting
Short circuit protection
MLP-16 [4x4] Package
Fixed frequency 250kHz
1x, 1.5x and 2x charge pump modes of operation
Applications
Cellular phones
LED backlighting
PDA power supplies
Portable devices
Electronic books
Wireless web appliances
LCD Modules
Typical Application Circuit
Patent Pending
BATTERY
1µF
June 27, 2005
VIN VOUT
1µF
SC604A
EN
CTRL0
CTRL1
CTRL2
GND
ILED1
ILED2
ILED3
ILED4
ISET
C1+ C1- C2+ C2-
1µF 1µF
United States Patents: 6,504,422, 6,794,926
1 www.semtech.com

1 page




SC604A pdf
SC604A
POWER MANAGEMENT
Pin Configuration
TOP VIEW
ILED1 ILED2 ILED3 ILED4
EN
CTRL0
CTRL1
CTRL2
16 15 14 13
1 12 GND
TOP VIEW
2 11 C2+
3 10 C2-
4 T 9 C1-
5678
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Ordering Information
DEVICE
PACKAGE(1)
SC604AIMLTR
MLP-16
SC604AIMLTRT(2)
MLP-16
SC604EVB
Evaluation Board
Notes:
(1) Available in tape and reel only. A reel contains 3000 devices.
(2) Available in lead-free package only. This product is fully WEEE and
RoHS compliant.
ISET VOUT VIN C1+
MLPQ16: 4X4 16 LEAD
Pin Descriptions
Pin Pin Name Pin Function
1 EN Active high enable
2 CTRL0 Output control bit 0 (see Table 1 on page 6)
3 CTRL1 Output control bit 1 (see Table 1 on page 6)
4 CTRL2 Output control bit 2 (see Table 1 on page 6)
5
ISET
LED current is
short the ISET
set by the value of the resistor
pin. VISET is typically 1.22V
RSET
connected
from
the
ISET pin to ground.
Do not
6 VOUT Voltage output source for connection to the LED anodes
7 VIN Voltage input
8 C1+ Positive terminal of bucket capacitor 1
9 C1- Negative terminal of bucket capacitor 1
10 C2- Negative terminal of bucket capacitor 2
11 C2+ Positive terminal of bucket capacitor 2
12 GND Ground
13 ILED4 Current sink for LED 4 [lf not in use, pin must be left open](1)
14
ILED3
Current sink for LED 3 [lf not in use, pin may be left open, grounded, or connected to VIN](1)
15
ILED2
Current sink for LED 2 [lf not in use, pin may be left open, grounded, or connected to VIN](1)
16
ILED1
Current sink for LED 1 [lf not in use, pin may be left open, grounded, or connected to VIN](1)
T Thermal Pad Pad for heatsinking purposes. Connect to ground plane using multiple vias. Not connected Internally
Note: (1) The CTRL word must match the outputs in use.
2005 Semtech Corp.
5
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5 Page





SC604A arduino
SC604A
POWER MANAGEMENT
Methods for Setting LED Current (Cont.)
Method 4. LED current may also be controlled by applying a PWM
signal to any of the CTRL2, CTRL1 and CTRL0 inputs. The circuit in
Figure 3 turns 4 LEDs on and off by applying a PWM signal to the
CTRL0 input. This circuit uses resistor
current and the average LED current is
tRhSeEnT
to set the on state
proportional to the
percentage of on-time when the CTRL0 pin is a logic low. Average
LED current is approximately equal to:
IAVG = (tON ILED_ON)/(tON + tOFF)
The recommended PWM frequency is between 100Hz and 500Hz.
Due to start up delay and ramp up time, frequency >500Hz will
result in error in the average value of ILED. Frequency <100Hz can
naturally cause the LEDs to blink visibly.
In PWM applications where ILED4 is not used, keep ILED4 pin 13
open. Connecting ILED4 to ground can result in the charge pump
operating in open loop mode. Connecting ILED4 to VIN will work
but will cause shutdown current IQ to increase to approximately
VIN / 100k.
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Figure 3 - PWM Example Circuit
Table 4 - Summary of LED Current Control
LED Current Control Method
Figure of Reference LED Current Range
Brightness
Control
Method 1
RSET Only
Circuit on Page 1
0.5mA < ILED < 30mA Fixed Brightness
Method 2
Method 3
Analog Reference VADJ
NMOS Switched Parallel
Resistors
Figure 1 on Page 10
Figure 2 on Page 10
0.5mA < ILED < 30mA
0.5mA < ILED < 30mA
Infinite
2N Stepped
Current Levels(1)
Method 4
PWM CTRLx Input(s)
Figure 3 on page 11
Note: 1) “N” is the number of NMOS transistors used for brightness control.
0.5mA < ILED < 30mA
Infinite
2005 Semtech Corp.
11
www.semtech.com

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