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AL8812FDF-13

P1-P3P4-P6P7-P9P10-P11
AL8812
Document number: DS37099 Rev. 1 - 2
1 of 11
www.diodes.com
March 2014
© Diodes Incorporated
A
L8812
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.
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)
Pin Assignments
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)
NC
GATE
INPUT
VCC
SENSE
DRIVE
SW/C
SW/E
GND
TIMING
SOURCE
DRAIN
U-DFN6040-12
2
3
4
5
6
7
8
9
10
11
12
1
AL8812
Document number: DS37099 Rev. 1 - 2
2 of 11
www.diodes.com
March 2014
© Diodes Incorporated
A
L8812
Pin Descriptions
Pin
Name
Pin
Number
(U-DFN6040-12)
Function
NC 1 No Connection
GATE 2 Gate connection of internal MOSFET.
INPUT 3 Feedback pin for inverting input of internal comparator
VCC 4 Supply voltage pin
SENSE 5 No Connection.
DRIVE 6
Current drive collector:
Normally connected to V
CC
directly or via a resistor.
SW/C 7 Internal switch transistor collector
SW/E 8 Internal switch transistor emitter
GND 9 Ground Connection
TIMING 10 Timing Capacitor to control the switching frequency.
SOURCE 11 Source connecton of internal MOSFET
DRAIN 12 Drain connection of internal MOSFET
Exposed PAD1 Exposed Pad of MOSFET Drain
Exposed PAD2 Exposed Pad of AL8812 and connect to PCB ground
Functional Diagram
1.25V
Reference
Regulato
r
Ipk
Oscillato
r
C
T
R
S
Q
Q2
Q1
100
Comparato
r
+
_
GND
TIMING
SW/E
SW/C
D RIVE
SENSE
VCC
INPUT
G
A
TE
DRAIN
SOURCE
2
3
4
5
6
7
8
9
10
12
11
AL8812
Document number: DS37099 Rev. 1 - 2
3 of 11
www.diodes.com
March 2014
© Diodes Incorporated
A
L8812
Absolute Maximum Ratings (@T
A
= +25°C, unless otherwise specified.)
Symbol Parameter Value Unit
V
CC
Power Supply Voltage 20 V
V
IR
Comparator Input Voltage Range -0.3 to +36 V
SW/C Switch Collector Voltage 36 V
SW/E
Switch Emitter Voltage (V
Pin
1 = 40V)
36 V
V
CE (switch)
Switch Collector to Emitter Voltage 36 V
DRIVE Driver Collector Voltage 36 V
I
C (driver)
Driver Collector Current (Note 4) 100 mA
I
SW
Switch Current 1.6 A
V
DS
Maximum MOSFET Drain-Source voltage 60 V
V
GS
Maximum MOSFET Gate-Source voltage +/-20 V
I
SOURCE
Maximum Continuous Source (Body Diode) Current 3.7 A
P
D
Continuous Power Dissipation (T
A
= +25°C)
(U-DFN6040-12 (derate 10mW/°C above +25°C)
1000 mW
θ
JA
Junction-to-Ambient Thermal Resistance 47.31
°C/W
θ
JC
Junction-to-Case Thermal Resistance 6.42
°C/W
T
MJ
Maximum Junction Temperature +150
°C
T
OP
Operating Junction Temperature Range
0 to +105
°C
T
stg
Storage Temperature Range -65 to +150
°C
ESD HBM Human Body Model ESD Protection 250 V
ESD MM Machine Model ESD Protection 100 V
Note: 4. Maximum package power dissipation limits must be observed.
Electrical Characteristics (@T
A
= +25°C, unless otherwise specified.)
Symbol Characteristics Min Typ Max Unit
OSCILLATOR
f
osc
Frequency (V
PIN
5 = 0V, C
T
= 1.0nF, T
A
= +25°C)
24 33 42 kHz
I
chg
Charge Current (V
CC
= 5.0V to 40V, T
A
= +25°C)
24 30 42 μA
I
dischg
Discharge Current (V
CC
= 5.0V to 40V, T
A
= +25°C)
140 200 260 μA
I
dischg
/ I
chg
Discharge to Charge Current Ratio (Pin 7 to V
CC
, T
A
= +25°C)
5.2 6.5 7.5 —
V
ipk (sense)
Current Limit Sense Voltage (I
chg
= I
dischg
, T
A
= +25°C)
300 400 450 mV
OUTPUT SWITCH (Note 5)
V
CE (sat)
Saturation Voltage, Darlington Connection
(I
SW
= 1.0A, Pins 1,8 connected)
— 1.0 1.3 V
V
CE (sat)
Saturation Voltage, Darlington Connection
(I
SW
= 1.0A, ID = 50mA, Forced ß ≈ 20)
— 0.45 0.7 V
h
FE
DC Current Gain (I
SW
= 1.0A, V
CE
= 5.0V, T
A
= +25°C)
50 75 — —
I
C (off)
Collector Off-State Current (V
CE
= 40V)
- 0.01 100 μA
OUTPUT MOSFET
V
GS(th)
MOSFET Gate Threshold voltage 1 — 2.2 V
V
FD
MOSFET Diodes forward voltage — .85 .95 V
R
DS(ON)
Drain-source on-resistance (VGS = 10V, ID = 2.5A)
Drain-source on-resistance (VGS = 4.5V, ID = 2A)
— —
120
180
mΩ
mΩ
COMPARATOR
V
th
Threshold Voltage
T
A
= +25°C
T
A
= 0
o
C to +70
o
C
— — — V
— 1.225 1.25 1.275 —
— 1.21 — 1.29 —
Reg
line
Threshold Voltage Line Regulation (V
CC
= 3.0V to 40V)
— 1.4 6.0 mV
TOTAL DEVICE
I
CC
Supply Current (V
CC
= 5.0V to 40V, C
T
=1.0nF, Pin 7 = V
CC
, V
Pin 5
> V
th
Pin 2
= Gnd, remaining pins open)
— — 3.5 mA
Note: 5. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.
P1-P3P4-P6P7-P9P10-P11

AL8812FDF-13

Mfr. #:
Buy AL8812FDF-13
Manufacturer:
Diodes Incorporated
Description:
Switching Voltage Regulators LED LV Int Switch
Lifecycle:
New from this manufacturer.
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