STLDC08PUR STMicroelectronics, STLDC08PUR Datasheet

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STLDC08PUR

Manufacturer Part Number
STLDC08PUR
Description
IC CTLR STEP-UP FOR LED 10-DFN
Manufacturer
STMicroelectronics
Datasheet

Specifications of STLDC08PUR

Internal Driver
No
Type - Primary
General Purpose
Mounting Type
*
Topology
PWM, Step-Up (Boost)
Number Of Outputs
1
Voltage - Supply
0.8 V ~ 3.6 V
Package / Case
*
Operating Temperature
-40°C ~ 85°C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Frequency
-
Voltage - Output
-
Lead Free Status / Rohs Status
 Details
Other names
497-11140-2

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Manufacturer
Quantity
Price
Part Number:
STLDC08PUR
Manufacturer:
STM
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STLDC08PUR
Manufacturer:
ST
Quantity:
20 000
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Part Number:
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Quantity:
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Features
Applications
Description
The STLDC08 LED driver step-up controller is
optimized to operate from one or two NiCd/NiMH
or alkaline cells. The IC is able to drive an
external MOSFET (N-channel) enabling it for use
with wide power levels. Hysteretic control
eliminates the need for small signal control loop
compensation. The IC integrates an FET driver for
a precise PWM dimming. STLDC08 comes in a
DFN10 (3 x 3 mm) package.
Table 1.
February 2011
Input voltage range from 0.8 V to 3.6 V
Overvoltage protection
Drives N-channel MOSFET or NPN bipolar
transistor
No control loop compensation required
FET driver for very precise PWM dimming
Single/dual cell NiMH, NiCd, or alkaline
batteries
Small appliances LED lighting
Portable lighting
STLDC08PUR
Order code
Device summary
Doc ID 18476 Rev 1
STLDC08
Marking
Step-up controller for LED supply
DFN10 (3 x 3 mm)
DFN10 (3 x 3 mm.)
Package
STLDC08
www.st.com
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STLDC08PUR Summary of contents

Page 1

... The IC integrates an FET driver for a precise PWM dimming. STLDC08 comes in a DFN10 ( mm) package. Table 1. Device summary Order code STLDC08PUR February 2011 Step-up controller for LED supply DFN10 ( mm) Marking STLDC08 Doc ID 18476 Rev 1 ...

Page 2

Contents Contents 1 Application diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

Page 3

STLDC08 12 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

Page 4

... Electric schematic optimized for 2 LEDs and I RF BATTERY EN/PWM AM07845v1 Table 2. List of components Reference Manufacturer C1 Murata C2 Murata C4 Murata C3, C5, C6 Murata L Coilcraft M1,M2 STMicroelectronics D1 STMicroelectronics Rfb VCC DRV 6 EN/PWM SENSE 1 VOUT 2VCC 2 PWMOUT GND EXP 8 11 Part number GRM21BR60J475 GRM31CB31C106K GRM188R70J103KA01B ...

Page 5

... Electric schematic optimized for 4 LEDs and I RF BATTERY VCC 7 EN/PWM EN/PWM 3 2VCC Table 3. List of components Part reference Manufacturer C1 Murata C2 Murata C4 Murata C3, C5, C6 Murata M1,M2 STMicroelectronics D1 STMicroelectronics L Coilcraft Rfb Rs RF LED DRV 6 SENSE 1 VOUT 2 PWMOUT 5 FB GND EXP 11 8 Part number GRM21BR60J106KE19 GRM31CR61C226K GRM188R70J103KA01B GRM188R61C105K STS5DNF20V STPS2L30 DO3316P-223_L ...

Page 6

Absolute maximum ratings 2 Absolute maximum ratings Table 4. Absolute maximum ratings Symbol V Supply voltage CC EN/PWM Analog input FB Analog input SENSE Analog input 2V Analog outputs CC V5 Analog outputs DRV, PWMOUT Analog outputs V Output voltage ...

Page 7

STLDC08 3 Pin configuration Figure 3. Pin connections (top through view) Bottom view Table 6. Pin description Pin # Pin name 1 VOUT Over voltage protection and supply pin for the IC when V Driver of the external MOSFET for ...

Page 8

Electrical characteristics 4 Electrical characteristics T = - µ otherwise specified. Table 7. Electrical characteristics Symbol Parameter General section V Supply voltage range CC Supply current measured on V pin ...

Page 9

STLDC08 Table 7. Electrical characteristics (continued) Symbol Parameter SENSE Maximum current sense V SENSE MAX threshold I Bias current SENSE EN/PWM section V Low level threshold IL V Low level threshold IL V High level threshold IH V High level ...

Page 10

Typical performance characteristics 5 Typical performance characteristics Figure 4. V vs. temperature FB Figure 6. I vs. temperature FB = 0.5 V OUT Figure 8. Efficiency vs. input voltage 2 LEDs Figure 9. 10/29 Figure 5. Maximum V Figure 7. ...

Page 11

STLDC08 Figure 10. Startup timing and dimming I vs. time, 2 LEDs 200 mA 2LEDs CC LED Figure 12. Startup timing and dimming I vs. time, 4 LEDs ...

Page 12

Block diagram 6 Block diagram Figure 16. Block diagram Over Voltage Over Voltage Protection Protection + TOFF timer TOFF timer T T OFF OFF GND GND GND GND = 20 µsec = 20 µsec T T ONMAX ...

Page 13

STLDC08 7 Detailed description 7.1 Main control loop The STLDC08 is an LED driver step-up controller dedicated to handheld equipment, having a typical voltage ranging from 0 1.5 V. The controller drives an N-channel Power MOSFET and implements ...

Page 14

Detailed description Figure 17. Timing diagram 1.7 V 1.7 V 2VCC 2VCC 1 OUT OUT DRV DRV ILED ILED PWMOUT PWMOUT Charge Pump Charge Pump active active ...

Page 15

STLDC08 7.5 Dimming When PWMOUT goes to zero, the LED current immediately goes to zero and the energy stored in the coil is discharged on the output capacitor, causing an increase in the output voltage. As soon as the PWM ...

Page 16

Application information 8 Application information 8.1 LED current programming The LED current is set by an external resistor connected between the FB pin and GND. The following equation can be used to calculate the value of the R the desired ...

Page 17

STLDC08 As a first approximation we choose the inductor ripple current the output current. Higher ripple current allows for smaller inductors, but it also increases the output capacitance for a given LED current ripple requirement. Conversely, lower ...

Page 18

Application information Equation 6 Where D is given by: MAX Equation 7 The value of the peak current on the inductor is given by the following equation: Equation 8 The minimum required saturation current of the inductor must be greater ...

Page 19

STLDC08 Equation 11 Equation 12 Equation 13 If the R of the main Power MOSFET is used to sense the current on the inductor the DS (ON) following procedure must be performed to choose the Power MOSFET. During ON time, ...

Page 20

Application information Figure 19. Current diagram ON state C C VBAT VBAT IN IN STLDC08 STLDC08 AM07849v1 AM07849v1 Figure 20. Current diagram OFF state VBAT VBAT STLDC08 STLDC08 AM07850v1 AM07850v1 Another important parameter is the drain source breakdown voltage. During ...

Page 21

STLDC08 8.6 Schottky diode selection Schottky diodes, with their low forward voltage and fast recovery time, are the ideal choice to maximize efficiency. The output diode in a boost converter conducts current only when the power switch is OFF. The ...

Page 22

... C3 2 GND EN/PWM Table 8. Bill of material optimized for 2 LEDs and I Reference Manufacturer C1 Murata C2 Murata C4 Murata C3, C5, C6 Murata L Coilcraft M1,M2 STMicroelectronics D1 STMicroelectronics Rfb Rs RF 22/29 TP1 VIN L1 1 TP5 C1 1 DRV U1 9 VCC DRV 6 EN/PWM SENSE 1 VOUT 2VCC 2 PWMOUT GND EXP 8 11 ...

Page 23

STLDC08 10 Layout suggestion Figure 22. Assembly layer Figure 23. Top layer Doc ID 18476 Rev 1 Layout suggestion 23/29 ...

Page 24

Layout suggestion Figure 24. Bottom layer 24/29 Doc ID 18476 Rev 1 STLDC08 ...

Page 25

STLDC08 11 Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: ECOPACK® is ...

Page 26

Package mechanical data Dim. Min 0.18 D 2.85 D2 2.20 E 2. 0.30 ddd 26/29 DFN10 (3x3 mm) mechanical data mm. Typ. Max. 0.90 1.00 0.02 0.05 0.65 0.80 ...

Page 27

STLDC08 Tape & reel QFNxx/DFNxx (3x3) mechanical data Dim. Min 12 mm. Typ. Max. Min. 180 13.2 0.504 0.795 2.362 14.4 3.3 3.3 1 Doc ID ...

Page 28

Revision history 12 Revision history Table 9. Document revision history Date Revision 22-Feb-2011 1 28/29 First release. Doc ID 18476 Rev 1 Changes STLDC08 ...

Page 29

... STLDC08 Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. ...

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