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SIP12401
New Product
Vishay Siliconix
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Boost Controller For Double AA Cell or Li-Ion Battery For White LED Application
FEATURES
D Voltage Mode Control with Internal Frequency Product Is Compensation Completely Pb-free D 1.8-V to 5.0-V Input Voltage Range D PWM Control with 600-kHz Fixed Switching Frequency D Analog Control of LED Intensity D Regulated Output Current D Integrated UVLO and Soft-Start D Logic Controlled Shutdown (t1 mA) D High Efficiency: Typical 80% D PowerPAKr MLP33-6 Package
APPLICATIONS
D D D D D White LED Backlighting LCD Bias Supplies Handheld Devices Digital Cameras Portable Applications
DESCRIPTION
SIP12401 is a boost controller IC for double cell NiMH or Alkaline battery and Li Ion battery, which can drive white LEDs connected in series to provide backlight in hand-held devices. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors. For best efficiency performance, the SIP12401 is designed to operate in PWM mode with 600-kHz switching. The voltage-mode PWM design is internally compensated, reducing the external parts count. It accepts input voltages from 1.8 V to 5.0 V. The LED current can be adjusted externally for its brightness control. SIP12401 features low shutdown current of under 1 mA. SIP12401 is available in a lead (Pb)-free 6-pin, PowerPAK MLP33 package and is specified to operate over the industrial temperature range of -40 C to 85 C.
TYPICAL APPLICATION CIRCUIT
MBR0520 VIN 10 mF 2 VIN XSHD 1 XSHD AGND 4 22 mH
4.7 mF
SIP12401
3 6
FB PGND 5
EXT
Si2302ADS
15 W
Document Number: 73193 S-50378--Rev. B, 28-Feb-05
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SIP12401
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ABSOLUTE MAXIMUM RATINGS (ALL VOLTAGES REFERENCED TO GND = 0 V)
Input Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to 6 V EXT Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to VIN +0.5V XSHD Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to VIN+0.5V FB Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to VIN+0.5V Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150_C Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to 150_C Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125_C Power Dissipationa PowerPAK MLP33-6 (TA = 70 _C)a . . . . . . . . . . . . . . . . . . . . . . . . . 1100 mW Thermal Resistanceb PowerPAK MLP33-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50_C/W Notes a. Derate 20 mW/_C above 70_C b. Device mounted with all leads soldered or welded to PC board.
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING RANGE (ALL VOLTAGES REFERENCED TO GND = 0 V)
Input Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.8 to 5 V XSHD, EXT Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to VIN LX Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to VOUT + 0.5 V FB Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to 5 V Operating Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . -40 to 85_C
SPECIFICATIONSa
Test Conditions Unless Specified p Parameter
Input Voltage UVLO UVLO Hysteresis Feedback Voltage Feedback Input Current Maximum PWM Duty Cycle PWM Switching Frequency Quiescent Current Stand-By Current XSHD Input High Level XSHD Input Low Level EXT High On Resistance EXT Low On Resistance
Symbol
VIN VUVLO VUVLOHYST VFB IFB MAXDTY fOSC IQ ISTB VXSHDH VXSHDL REXTH REXTL
Tempa
Limits Minb
1.8 1.65 0.1 0.291 0.3 1 77 85 600 200 775 300 1 1.2 0.2 35 30 0.309 0.318 nA % kHz mA V W
VIN = 3 V, TA = 25_C
Typc
Maxb
5 1.77
Unit
Full Full
V
Full VFB = 0.3 V Full VFB = 0.4 V XSHD = 0 V Full Full Full IEXT = 10 mA
0.282
425
Notes a. Full = -40 to 85 _C b. The algebraic convention whereby the most negative value is a minimum and the most positive a maximum (-40_ to 85_C). c. Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing.
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Document Number: 73193 S-50378--Rev. B, 28-Feb-05
SIP12401
New Product
PIN CONFIGURATION AND TRUTH TABLE
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PowerPAK MLP33-6
XSHD
1
10
EXT
VIN
2
9
PGND
FB
3
8
AGND
Top View
ORDERING INFORMATION
Part Number
SIP12401DMP-T1-E3
Temperature Range
-40 to 85_C
Marking
2401
PIN DESCRIPTION
Pin Number
1 2 3 4 5 6
Name
XSDH VIN FB AGND PGND EXT Battery Input Voltage Output Voltage Feedback Pin Signal Ground Power Ground Drive Pin for External Power MOS
Function
Logic Controlled Shutdown Input, XSHD = High: Normal Operation, XSHD = Low: Shutdown
PIN FUNCTIONS
XSHD (Pin 1) XSHD is the logic controlled shutdown input pin. When XSHD is low, the IC is shutdown and it's quiescent current is less than 1 mA. When XSHD is high, the IC is working in normal operation. VIN (Pin 2) VIN is the pin connected to battery input voltage. The IC gets its power supply from VIN. FB (Pin 3) FB is the feedback pin of the output voltage via resistor divider. FB is about 0.3 V and its difference from 0.3-V reference voltage is amplified by the error amplifier.
Document Number: 73193 S-50378--Rev. B, 28-Feb-05
AGND (Pin 4) AGND is the pin for ground of controlling circuit.
PGND (Pin 5) PGND is the pin for ground of the internal power MOS driver.
EXT (Pin 6) EXT is the output pin of internal driver. It's connected to the gate of external power MOSFET.
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SIP12401
Vishay Siliconix
FUNCTIONAL BLOCK DIAGRAM
VIN AGND Compensation
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FB
- E/A +
+ PWM -
Driver
EXT PGND
XSHD
Reference and Soft-Start
Oscillator
DETAILED OPERATION
SIP12401 is a 600-kHz boost controller IC, packaged in 6-pin MLP33, for white LED applications. It features fixed frequency voltage mode PWM control with internal frequency compensation. With the low rDS(on) external power MOSFET, this device maintains high efficiency over a wide range of load current. PWM operation After soft-start, the device is working in PWM operation with a fixed frequency of 600 kHz.
Application Information
White LED Brightness Control
Soft-Start
During soft-start, the loop compensation guarantees the slow increase of the output voltage and inrush current, so that no large voltage overshoot and inrush current occur when the soft-start is ended.
The current of white LED can be adjusted by PWM signal on the XSHD pin or by a variable dc voltage to control its brightness. (See Figure 1.) As control voltage VCTRL increases, the voltage drop on R2 increases and the voltage drop on R1 decreases. Thus, the LED current decreases. The selection of R2 and R3 will make the current from VCTRL much smaller than LED current and much larger than the FB pin bias current.
MBR0520 VIN 10 mF 2 VIN XSHD 1 XSHD AGND 4 22 mH
4.7 mF
ILED + 0.3V ) 15W
0.3 * V CTRL R2 @ 15W R3
3 FB
SIP12401
6
EXT PGND 5
Si2302ADS
R2 1 kW R3 3.9 kW 15 W
VCTRL www.vishay.com Document Number: 73193 S-50378--Rev. B, 28-Feb-05
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SIP12401
New Product
TYPICAL CHARACTERISTICS
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Maixmum PWM Duty Cycle vs. Temperature
85 220 215 84 Supply Curremt (mA) % Duty Cycle 210 205 200 195 190 185 80 -50 180 -50
Supply Current vs. Temperature
83
82
81
-30
-10
10
30
50
70
90
-30
-10
10
30
50
70
90
Temperature (_C)
Temperature (_C)
Feedback Voltage vs. Temperature
4 3 Feedback Voltage Accuracy (%) 2 1 0 -1 -2 -3 -4 -50 0.2 0.0 -50 VIN = 5 V VIN = 2 V Shutdown Threshold (V) 1.2 1.0 0.8
Shutdown Threshold vs. Temperature
VIN = 5 V
VIN = 2 V 0.6 0.4
-30
-10
10
30
50
70
90
-30
-10
10
30
50
70
90
Temperature (_C)
Temperature (_C)
Document Number: 73193 S-50378--Rev. B, 28-Feb-05
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SIP12401
Vishay Siliconix
TYPICAL WAVEFORMS
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Figure 1.
PWM Dimming Control
Figure 2.
Switching Waveforms: VIN, VOUT and VEXT
200 Hz 50% Duty Cycle PWM Signal on XSHD Pin
VIN = 3.6 V L = 22 mH, COUT = 4.7 mF, Four LEDs in Series
VXSHD 2 V/div
VIN 20 mV/div ac coupled VOUT 50 mV/div ac coupled
VOUT 2 V/div
VFB 0.2 V/div
VEXT 2 V/div
VIN = 3.6 V Four LEDs in series
1 ms/div
1 ms/div
Vishay Siliconix maintains worldwide manufacturing capability. Products may be manufactured at one of several qualified locations. Reliability data for Silicon Technology and Package Reliability represent a composite of all qualified locations. For related documents such as package/tape drawings, part marking, and reliability data, see http://www.vishay.com/ppg?73193. www.vishay.com Document Number: 73193 S-50378--Rev. B, 28-Feb-05
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