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Diodes Semiconductor Electronic Components Datasheet

AL8812 Datasheet

BOOST/BUCK DC-DC CONVERTER

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AL8812 pdf
AL8812
BOOST/BUCK DC-DC CONVERTER FOR DIMMABLE MR16 LED LAMPS
Description
The AL8812 is a monolithic control circuit containing the primary
functions required for DC-to-DC converters with MOSFET in one
package. These devices consist of an internal temperature
compensated reference, comparator, controlled duty cycle oscillator
with an active current limit circuit, driver and high current output
switch. Additionally a 60V, 3.6A MOSFET is integrated for reduced
BOM cost and size. This series is specifically designed for buck and
boost applications with a minimum number of external components.
Pin Assignments
NC 1
GATE 2
INPUT 3
VCC 4
SENSE 5
DRIVE 6
12 DRAIN
11 SOURCE
10 TIMING
9 GND
8 SW/E
7 SW/C
U-DFN6040-12
Features
Operation from 3.0V to 20V Input
Integrated 60V, 3.6A MOSFET
Low Standby Current
Current Limiting
Output Voltage Adjustable
Frequency Operation to 100 kHz
Precision 2% Reference
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Applications
Low Voltage LED Lighting such as MR-16
General Purpose DC-DC Converter
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Typical Applications Circuit
Dimmable MR-16 LED Driver System Diagram
(For detailed schematic please contact your Diodes Sales Representative)
AL8812
Document number: DS37099 Rev. 1 - 2
1 of 11
www.diodes.com
March 2014
© Diodes Incorporated



Diodes Semiconductor Electronic Components Datasheet

AL8812 Datasheet

BOOST/BUCK DC-DC CONVERTER

No Preview Available !

AL8812 pdf
Pin Descriptions
Pin
Name
NC
GATE
INPUT
VCC
SENSE
Pin
Number
(U-DFN6040-12)
1
2
3
4
5
DRIVE
6
SW/C
SW/E
GND
TIMING
SOURCE
DRAIN
Exposed PAD1
Exposed PAD2
7
8
9
10
11
12
Function
No Connection
Gate connection of internal MOSFET.
Feedback pin for inverting input of internal comparator
Supply voltage pin
No Connection.
Current drive collector:
Normally connected to VCC directly or via a resistor.
Internal switch transistor collector
Internal switch transistor emitter
Ground Connection
Timing Capacitor to control the switching frequency.
Source connecton of internal MOSFET
Drain connection of internal MOSFET
Exposed Pad of MOSFET Drain
Exposed Pad of AL8812 and connect to PCB ground
Functional Diagram
6
DRIVE
7
SW/C
5
SENSE
VCC
4
INPUT 3
GATE
2
SQ
Q2
R
100
Q1
8
Ipk
Oscillator
CT
SW/E
Comparator
+
_
10
1.25V
Reference
Regulator
TIMING
9
GND
12
DRAIN
 
11
SOURCE
AL8812
Document number: DS37099 Rev. 1 - 2
2 of 11
www.diodes.com
AL8812
March 2014
© Diodes Incorporated



Diodes Semiconductor Electronic Components Datasheet

AL8812 Datasheet

BOOST/BUCK DC-DC CONVERTER

No Preview Available !

AL8812 pdf
AL8812
Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.)
Symbol
VCC
VIR
SW/C
SW/E
VCE (switch)
DRIVE
IC (driver)
ISW
VDS
VGS
ISOURCE
PD
θJA
θJC
TMJ
TOP
Tstg
ESD HBM
ESD MM
Power Supply Voltage
Parameter
Comparator Input Voltage Range
Switch Collector Voltage
Switch Emitter Voltage (VPin 1 = 40V)
Switch Collector to Emitter Voltage
Driver Collector Voltage
Driver Collector Current (Note 4)
Switch Current
Maximum MOSFET Drain-Source voltage
Maximum MOSFET Gate-Source voltage
Maximum Continuous Source (Body Diode) Current
Continuous Power Dissipation (TA = +25°C)
(U-DFN6040-12 (derate 10mW/°C above +25°C)
Junction-to-Ambient Thermal Resistance
Junction-to-Case Thermal Resistance
Maximum Junction Temperature
Operating Junction Temperature Range
Storage Temperature Range
Human Body Model ESD Protection
Machine Model ESD Protection
Note:
4. Maximum package power dissipation limits must be observed.
Value
20
-0.3 to +36
36
36
36
36
100
1.6
60
+/-20
3.7
1000
47.31
6.42
+150
0 to +105
-65 to +150
250
100
Unit
V
V
V
V
V
V
mA
A
V
V
A
mW
°C/W
°C/W
°C
°C
°C
V
V
Electrical Characteristics (@TA = +25°C, unless otherwise specified.)
Symbol
Characteristics
OSCILLATOR
fosc Frequency (VPIN 5 = 0V, CT = 1.0nF, TA = +25°C)
Ichg Charge Current (VCC = 5.0V to 40V, TA = +25°C)
Idischg
Discharge Current (VCC = 5.0V to 40V, TA = +25°C)
Idischg / Ichg Discharge to Charge Current Ratio (Pin 7 to VCC, TA = +25°C)
Vipk (sense) Current Limit Sense Voltage (Ichg = Idischg, TA = +25°C)
OUTPUT SWITCH (Note 5)
VCE (sat)
VCE (sat)
Saturation Voltage, Darlington Connection
(ISW = 1.0A, Pins 1,8 connected)
Saturation Voltage, Darlington Connection
(ISW = 1.0A, ID = 50mA, Forced ß 20)
hFE DC Current Gain (ISW = 1.0A, VCE = 5.0V, TA = +25°C)
IC (off)
Collector Off-State Current (VCE = 40V)
OUTPUT MOSFET
VGS(th)
VFD
RDS(ON)
MOSFET Gate Threshold voltage
MOSFET Diodes forward voltage
Drain-source on-resistance (VGS = 10V, ID = 2.5A)
Drain-source on-resistance (VGS = 4.5V, ID = 2A)
COMPARATOR
Vth Threshold Voltage
TA = +25°C
TA = 0oC to +70oC
Regline
Threshold Voltage Line Regulation (VCC = 3.0V to 40V)
TOTAL DEVICE
ICC
Supply Current (VCC = 5.0V to 40V, CT =1.0nF, Pin 7 = VCC, VPin 5 > Vth Pin 2
= Gnd, remaining pins open)
Min
24
24
140
5.2
300
50
-
1
1.225
1.21
Typ
33
30
200
6.5
400
1.0
0.45
75
0.01
.85
1.25
1.4
Max
42
42
260
7.5
450
1.3
0.7
100
2.2
.95
120
180
1.275
1.29
6.0
3.5
Note:
5. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.
Unit
kHz
μA
μA
mV
V
V
μA
V
V
m
m
V
mV
mA
AL8812
Document number: DS37099 Rev. 1 - 2
3 of 11
www.diodes.com
March 2014
© Diodes Incorporated




Part Number AL8812
Description BOOST/BUCK DC-DC CONVERTER
Maker Diodes
Total Page 11 Pages
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