BCD AP3202 380khz, 2a asynchronous dc-dc buck converter Datasheet

Preliminary Datasheet
380kHz, 2A Asynchronous DC-DC Buck Converter
General Description
Features
The AP3202 is a 380kHz fixed frequency, current
mode, PWM buck (step-down) DC-DC converter,
capable of driving a 2A load with high efficiency,
excellent line and load regulation. The device
integrates N-channel power MOSFET switch with
low on-resistance. Current mode control provides fast
transient response and cycle-by-cycle current limit.
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A standard series of inductors are available from
several different manufacturers optimized for use
with the AP3202. This feature greatly simplifies the
design of switch-mode power supplies.
AP3202
Input Voltage Range: 4.75V to 18V
Fixed 380kHz Frequency
High Efficiency: up to 93%
Output Current: 2A
Current Mode Control
Built-in Over Current Protection
Built-in Thermal Shutdown Function
Built-in UVLO Function
Built-in Over Voltage Protection
Built-in Soft-start
Applications
This IC is available in SOIC-8 package.
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LCD TV
Set Top Box
Portable DVD
Digital Photo Frame
SOIC-8
Figure 1. Package Type of AP3202
Mar. 2011
Rev. 1. 2
BCD Semiconductor Manufacturing Limited
1
Preliminary Datasheet
380kHz, 2A Asynchronous DC-DC Buck Converter
AP3202
Pin Configuration
M Package
(SOIC-8)
Figure 2. Pin Configuration of AP3202 (Top View)
Pin Description
Pin Number
Pin Name
1
BS
2
IN
3
SW
4
GND
5
FB
6
COMP
7
EN
8
NC
Mar. 2011
Function
Bootstrap pin. A bootstrap capacitor is connected between the BS pin
and SW pin. The voltage across the bootstrap capacitor drives the
internal high-side power MOSFET
Supply input pin. A capacitor should be connected between the IN pin
and GND pin to keep the input voltage constant
Power switch output pin. This pin is connected to the inductor and
bootstrap capacitor
Ground pin
Feedback pin. This pin is connected to an external resistor divider to
program the system output voltage. When the FB pin voltage exceeds
20% of the nominal regulation value of 1.222V, the over voltage
protection is triggered. When the FB pin voltage is below 0.6V, the
oscillator frequency is lowered to realize short circuit protection
Compensation pin. This pin is the output of the transconductance
error amplifier and the input to the current comparator. It is used to
compensate the control loop. Connect a series RC network from this
pin to GND. In some cases, an additional capacitor from this pin to
GND pin is required
Control input pin. Forcing this pin above 1.5V or set this pin floating
enables the IC. Forcing this pin below 0.5V shuts down the IC. When
the IC is in shutdown mode, all functions are disabled to decrease the
supply current below 1µA
No Connection
Rev. 1. 2
BCD Semiconductor Manufacturing Limited
2
Preliminary Datasheet
380kHz, 2A Asynchronous DC-DC Buck Converter
AP3202
Functional Block Diagram
IN
2
Internal Bias
And Regulator
INTERNAL
PULL
HIGH
SLOP
COMP
Current
Sense
Amplifier
5V
Oscillator
90k/380k
Shutdown
Comparator
EN
Q
R
Q
PWM
Comparator
7
0.5/1.5V
BS
3
SW
M1
0.22
CLK
S
1
M2
10
1.8V
4
Short
Protection
Comparator
0.6
GND
1.222
Error
Amplifier
6
5
FB
8
NC
COMP
Figure 3. Functional Block Diagram of AP3202
Ordering Information
AP3202
-
Circuit Type
G1: Green
Package
M: SOIC-8
Package
Temperature
Range
SOIC-8
-40 to 85°C
TR: Tape & Reel
Blank: Tube
Part Number
Marking ID
Packing Type
AP3202M-G1
3202M-G1
Tube
AP3202MTR-G1
3202M-G1
Tape & Reel
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant
and green.
Mar. 2011
Rev. 1. 2
BCD Semiconductor Manufacturing Limited
3
Preliminary Datasheet
380kHz, 2A Asynchronous DC-DC Buck Converter
AP3202
Absolute Maximum Ratings (Note 1)
Parameter
Symbol
Value
Unit
IN Pin Voltage
VIN
-0.3 to 20
V
EN Pin Voltage
VEN
-0.3 to VIN
V
SW Pin Voltage
VSW
20
V
BS Pin Voltage
VBS
-0.3 to VSW+6
V
FB Pin Voltage
VFB
-0.3 to 6
V
COMP Pin Voltage
VCOMP
-0.3 to 6
V
Thermal Resistance
θJA
105
ºC/W
Operating Junction Temperature
TJ
150
ºC
Storage Temperature
TSTG
-65 to 150
ºC
Lead Temperature (Soldering, 10sec)
TLEAD
260
ºC
ESD (Machine Model)
200
V
ESD (Human Body Model)
2000
V
Note 1: Stresses greater than 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 under “Recommended Operating Conditions” is not implied. Exposure to “Absolute
Maximum Ratings” for extended periods may affect device reliability.
Recommended Operating Conditions
Parameter
Symbol
Min
Max
Unit
Input Voltage
VIN
4.75
18
V
IOUT(Max)
2
TA
-40
Maximum Output Current
Operating Ambient Temperature
Mar. 2011
Rev. 1. 2
A
85
ºC
BCD Semiconductor Manufacturing Limited
4
Preliminary Datasheet
380kHz, 2A Asynchronous DC-DC Buck Converter
AP3202
Electrical Characteristics
VIN=VEN=12V, VOUT=3.3V, unless otherwise specified. Specification with standard typeface are for
TA=25oC, and those in boldface type apply over the full operating temperature range (TA=-40oC to 85oC)
Parameter
Symbol
Input Voltage
VIN
Quiescent Current
IQ
Shutdown Supply Current
ISHDN
Conditions
Min
Typ
Max
Unit
18
V
1.0
1.5
mA
1
10
µA
1.222
1.258
V
4.75
VFB=1.4V, VEN=2V
VEN=0V
Feedback Voltage
VFB
Feedback Over Voltage
Threshold
VFBOV
1.48
V
Feedback SCP Voltage Threshold
VFBSCP
0.6
V
Feedback Bias Current
1.185
VFB=1V
High-side Switch On-resistance (Note 2)
RDSONH
ISW=0.5A
0.22
Ω
Low-side Switch On-resistance (Note 2)
RDSONL
ISW=0.05A
10
Ω
High-side Switch Leakage Current
ILEAKH
VIN=18V, VEN=0V
VSW=0V
0.1
High-side Switch Current Limit
ILIMH
Low-side Switch Current Limit
ILIML
EN Pin Threshold
-0.1
2.8
From drain to source
VENH
0.1
µA
IFB
10
µA
3.8
A
0.15
A
1.5
VENL
0.5
V
µA
EN Pull-up Current
IEN-PH
VEN=0V
Input UVLO Threshold
VUVLO
VIN Rising
Input UVLO Hysteresis
VHYS
0.3
V
Oscillator Frequency
FOSC1
380
kHz
Short Circuit Oscillator
Frequency
FOSC2
90
kHz
Maximum Duty Cycle
DMAX
VFB=1.0V
90
%
Minimum Duty Cycle
DMIN
VFB=1.5V
Error Amplifier Voltage Gain (Note 3)
AEA
400
V/V
Error Amplifier Transconductance
GEA
700
µA/V
COMP to Current Sense
Transconductance
GCS
2.4
A/V
Thermal Shutdown (Note 3)
TOTSD
160
ºC
Thermal Shutdown Hysteresis (Note 3)
THYS
30
ºC
500
µs
Soft-start Time (Note 3)
Note 2: RDSON=
tSS
IOUT=0A
1.0
3.5
3.9
4.4
0
V
%
VSW1 - VSW2
ISW1 - ISW2
Note 3: Not tested, guaranteed by design.
Mar. 2011
Rev. 1. 2
BCD Semiconductor Manufacturing Limited
5
Preliminary Datasheet
380kHz, 2A Asynchronous DC-DC Buck Converter
AP3202
Typical Performance Characteristics
TA=25oC, VIN=12V, VOUT=3.3V, unless otherwise noted.
375
90
350
High-side Switch On-resistance (mΩ)
100
Efficiency (%)
80
70
60
50
40
30
20
VIN=5V
10
VIN=12V
0
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
325
300
275
250
225
200
175
150
125
-40
2.0
-20
0
20
60
80
100
120
140
o
Output Current (A)
Figure 4. Efficiency vs. Output Current
Figure 5. RDSONH vs. Case Temperature
1.30
20
18
1.25
16
Feedback Voltage (V)
Low-side Switch On-resistance (Ω)
40
Case Temperature ( C)
14
12
10
1.20
1.15
1.10
8
1.05
6
4
-40
-20
0
20
40
60
80
100
120
1.00
-60
140
-20
0
20
40
60
80
100
120
140
Case Temperature ( C)
Figure 6. RDSONL vs. Case Temperature
Mar. 2011
-40
o
o
Case Temperature ( C)
Figure 7. Feedback Voltage vs. Case Temperature
Rev. 1. 2
BCD Semiconductor Manufacturing Limited
6
Preliminary Datasheet
380kHz, 2A Asynchronous DC-DC Buck Converter
AP3202
Typical Performance Characteristics (Continued)
1.5
3.50
1.4
3.45
1.3
3.40
Output Voltage (V)
Quiescent Current (mA)
TA=25oC, VIN=12V, VOUT=3.3V, unless otherwise noted.
1.2
1.1
1.0
0.9
3.35
3.30
3.25
3.20
0.8
3.15
0.7
3.10
0.6
3.05
0.5
-60
-40
-20
0
20
40
60
80
100
120
3.00
0.0
140
Case Temperature ( C)
Figure 8. Quiescent Current vs.
Case Temperature
1.0
1.5
2.0
Figure 9. Output Voltage vs.
Output Current
VEN
2V/div
VOUT
1V/div
VEN
2V/div
VOUT
1V/div
IL
1A/div
IL
1A/div
VSW
10V/div
VSW
10V/div
Time (10ms/div)
Time (10ms/div)
Figure 10. Enable Turn on Characteristic
(IOUT=2A, CC Mode)
Mar. 2011
0.5
Output Current (A)
o
Figure 11. Enable Turn off Characteristic
(IOUT=2A, CC Mode)
Rev. 1. 2
BCD Semiconductor Manufacturing Limited
7
Preliminary Datasheet
380kHz, 2A Asynchronous DC-DC Buck Converter
AP3202
Typical Performance Characteristics (Continued)
TA=25oC, VIN=12V, VOUT=3.3V, unless otherwise noted.
VOUT
2V/div
VOUT
2V/div
IL
1A/div
IL
1A/div
VEN
2V/div
VSW
5V/div
VEN
2V/div
VSW
5V/div
Time (400µs/div)
Time (800µs/div)
Figure 12. Enable Turn on Characteristic
(IOUT=2A, Resistance Load)
Figure 13. Enable Turn off Characteristic
(IOU T=2A, Resistance Load)
VOUT
2V/div
VOUT
2V/div
IL
1A/div
IL
1A/div
VSW
5V/div
VSW
5V/div
Time (100µs/div)
Time (100µs/div)
Figure 14. Short Circuit Protection
(IOUT=2A)
Mar. 2011
Figure 15. Short Circuit Recovery
(IOUT=2A)
Rev. 1. 2
BCD Semiconductor Manufacturing Limited
8
Preliminary Datasheet
380kHz, 2A Asynchronous DC-DC Buck Converter
AP3202
Typical Application
Figure 16. Typical Application of AP3202
Mar. 2011
Rev. 1. 2
BCD Semiconductor Manufacturing Limited
9
Preliminary Datasheet
380kHz, 2A Asynchronous DC-DC Buck Converter
AP3202
Mechanical Dimensions
SOIC-8
4.700(0.185)
5.100(0.201)
7°
Unit: mm(inch)
0.320(0.013)
1.350(0.053)
1.750(0.069)
8°
8°
7°
0.675(0.027)
0.725(0.029)
D
5.800(0.228)
1.270(0.050)
6.200(0.244)
TYP
D
20:1
0.800(0.031)
0.300(0.012)
R0.150(0.006)
0.100(0.004)
0.200(0.008)
0°
8°
1.000(0.039)
3.800(0.150)
4.000(0.157)
0.330(0.013)
0.190(0.007)
0.250(0.010)
1°
5°
0.510(0.020)
0.900(0.035)
R0.150(0.006)
0.450(0.017)
0.800(0.031)
Note: Eject hole, oriented hole and mold mark is optional.
Mar. 2011
Rev. 1. 2
BCD Semiconductor Manufacturing Limited
10
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