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Diodes Semiconductor Electronic Components Datasheet

AL8811 Datasheet

Boost/Buck/Inverting DC-DC CONVERTER

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AL8811 pdf
AL8811
Boost/Buck/Inverting DC-DC CONVERTER
Description
The AL8811 is a monolithic control circuit containing the primary
functions required for DC-to-DC converters. 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. This series is specifically designed for
incorporating in Boost, Buck and voltage-inverting applications with a
minimum number of external components.
Pin Assignments
 
Features
Operation from 3.0V to 20V Input
Low Standby Current
Current Limiting
Output Switch Current to 1.6A
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) 
MSOP-8
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 Application Diagram
Electronic Transformer compatible MR16 lamp Simplified Schematic
AL8811
Document number: DS36090 Rev. 2 - 2
1 of 11
www.diodes.com
June 2013
© Diodes Incorporated



Diodes Semiconductor Electronic Components Datasheet

AL8811 Datasheet

Boost/Buck/Inverting DC-DC CONVERTER

No Preview Available !

AL8811 pdf
AL8811
Pin Descriptions
Pin Name Pin Number
Descriptions
Current
Switch+
Current
Switch-
Internal switch transistor collector:
1 Connect to Inductor for boost converter.
Connect to VCC for Buck or Inverting converter
Internal switch transistor emitter:
2 Connect to GND for boost converter
Connect to Inductor for buck or inverting converter
CT 3 Timing Capacitor to control the switching frequency
GND
4
Feedback
5 Feedback pin for inverting input of internal comparator
VCC
6 Supply voltage pin
Current
Sense
7
Peak Current Sense Input by monitoring the voltage drop across an external current sense
resistor to limit the peak current through the switch
Current
Drive
8
Current drive collector:
Normally connected to VCC directly or via a resistor.
Functional Diagram
AL8811
Document number: DS36090 Rev. 2 - 2
2 of 11
www.diodes.com
June 2013
© Diodes Incorporated



Diodes Semiconductor Electronic Components Datasheet

AL8811 Datasheet

Boost/Buck/Inverting DC-DC CONVERTER

No Preview Available !

AL8811 pdf
AL8811
Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.)
Symbol
VCC
VIR
VC (SWITCH)
VE (SWITCH)
VCE (SWITCH)
VC (DRIVER)
IC (DRIVER)
ISW
PD
JA
TMJ
TSTG
ESD HBM
ESD MM
Power Supply Voltage
Parameter
Comparator Input Voltage Range
“Current Switch +” Collector Voltage
„Current Switch –„ Emitter Voltage (VPIN 1 = 36V)
“Current Switch” Collector to Emitter Voltage
“Current Drive” Collector Voltage
“Current Drive” Collector Current
“Current Switch” Current
Power Dissipation (Note 4)
Thermal Resistance
Maximum Junction Temperature
Storage Temperature Range
Human Body Model ESD Protection
Machine Model ESD Protection
Rating
20
-0.3 to +36
36
36
36
36
100
1.6
600
130
+150
-65 to +150
1
150
Unit
V
V
V
V
V
V
mA
A
mW
C/W
C
C
kV
V
Caution:
Stresses greater than the 'Absolute Maximum Ratings' specified above, may cause permanent damage to the device. These are stress ratings only;
functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may be
affected by exposure to absolute maximum rating conditions for extended periods of time.
Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when handling
and transporting these devices.
Recommended Operating Conditions
Symbol
VCC
TOP
Parameter
Supply Voltage
Operating Junction Temperature Range
Min Max Unit
3 20 V
-40
+105
C
Electrical Characteristics (@ VCC = 5V, TA = +25°C, unless otherwise specified.)
Symbol
Parameter
OSCILLATOR
fOSC
Frequency (VPIN 5 = 0V, CT = 1.0nF, TA = +25°C)
ICHG
Charge Current (VCC = 5.0V to 20V, TA = +25°C)
IDISCHG
Discharge Current (VCC = 5.0V to 20V, 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 4)
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 = 20V)
COMPARATOR
Vth Threshold Voltage TA = +25°C
Reg(LINE) Threshold Voltage Line Regulation (VCC = 3.0V to 20V)
TOTAL DEVICE
ICC
Supply Current (VCC = 5.0V to 20V, CT =1.0nF, Pin 7 = VCC,
VPIN 5 > Vth Pin 2 = Gnd, remaining pins open)
Min
24
24
140
5.2
300
50
1.225
Typ
33
30
200
6.5
400
1.0
0.45
75
0.01
1.25
1.4
Max
42
42
260
7.5
450
1.3
0.7
100
1.275
6.0
3.5
Unit
kHz
µA
µA
mV
V
V
µA
V
mV
mA
AL8811
Document number: DS36090 Rev. 2 - 2
3 of 11
www.diodes.com
June 2013
© Diodes Incorporated




Part Number AL8811
Description Boost/Buck/Inverting DC-DC CONVERTER
Maker Diodes
Total Page 11 Pages
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