BCD AP3211HKTR-G1 1.4mhz, 1.5a asynchronous dc-dc buck converter Datasheet

Preliminary Datasheet
1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER
General Description
Features
The AP3211H is a 1.4MHz fixed frequency, current
mode, PWM buck (step-down) DC-DC converter,
capable of driving a 1.5A 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 AP3211H. This feature greatly simplifies the
design of switch-mode power supplies.
AP3211H
Input Voltage Range: 4.5V to 23V
Fixed 1.4MHz Frequency
High Efficiency: up to 92%
Output Current: 1.5A
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
The AP3211H is available in SOT-23-6 package.
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LCD TV
DPF
Portable DVD
SOT-23-6
Figure 1. Package Type of AP3211H
Aug. 2012
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
1
Preliminary Datasheet
1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER
AP3211H
Pin Configuration
K Package
(SOT-23-6)
Pin 1 Mark
BS
1
6
SW
GND
2
5
IN
FB
3
4
EN
Figure 2. Pin Configuration of AP3211H (Top View)
Pin Description
Pin Number
Pin Name
1
BS
2
GND
3
FB
4
EN
5
IN
6
SW
Aug. 2012
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 NMOS switch
Ground pin
Feedback pin. This pin is connected to an external resistor
divider to program the system output voltage. When VFB
exceeds 20% of the nominal regulation value of 0.81V, the
OVP is triggered. When VFB<0.25V, the oscillator frequency
is lowered to realize short circuit protection
Control input pin. Forcing this pin above 1.5V enables the IC.
Forcing this pin below 0.4V shuts down the IC. When the IC
is in shutdown mode, all functions are disabled to decrease
the supply current below 1μA
Supply input pin. A capacitor should be connected between
the IN pin and GND pin to keep the DC input voltage
constant
Power switch output pin. This pin is connected to the inductor
and bootstrap capacitor
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
2
Preliminary Datasheet
1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER
AP3211H
Functional Block Diagram
IN
5
SCHOTTKY
FB
CL
GND
2
SS
HICCUP
1
BOOSTRAP
REGULATOR
BS
2A/V
OSC
1.4 MHz/
460 KHz
VDD/VDD1
REGULATOR
VREF
RAMP
GENERATOR
CS
OSC
1pF
S
Q
VLIMIT
EN
4
3.3V
CL
REFERENCE
VOLTAGE
27pF
1M
220k
6
SW
R
SS
FB
SWITCH / LDO
R
ERR AMP
3
PWM
COMPARATOR
Figure 3. Functional Block Diagram of AP3211H
Ordering Information
AP3211H
-
Circuit Type
G1: Green
Package
K: SOT-23-6
TR: Tape & Reel
Package
Temperature
Range
SOT-23-6
-40 to 85°C
Part Number
AP3211HKTR-G1
Marking ID
GBK
Packing
Type
Tape & Reel
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant
and green.
Aug. 2012
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
3
Preliminary Datasheet
1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER
AP3211H
Absolute Maximum Ratings (Note 1)
Parameter
Symbol
Value
Unit
Input Pin Voltage
VIN
-0.3 to 25
V
EN Pin Voltage
VEN
-0.3 to VIN+0.3
V
SW Pin Voltage
VSW
26
V
Bootstrap Pin Voltage
VBS
-0.3 to VSW+6
V
Feedback Pin Voltage
VFB
-0.3 to 6
V
TJ
150
ºC
TSTG
-65 to 150
ºC
TLEAD
260
ºC
θJA
220
ºC/W
Operating Junction Temperature
Storage Temperature
Lead Temperature
(Soldering, 10sec)
Thermal Resistance
(Junction to Ambient)
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
4.5
23
V
Operating Ambient Temperature
TA
-40
85
ºC
Aug. 2012
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
4
Preliminary Datasheet
1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER
AP3211H
Electrical Characteristics
VIN=VEN=12V, VOUT=3.3V, TA=25ºC, unless otherwise specified.
Parameter
Symbol
Input Voltage
VIN
Quiescent Current
IQ
Shutdown Supply Current
ISHDN
Feedback Voltage
VFB
Feedback Over Voltage Threshold
VFBOV
Feedback Bias Current
IFB
Conditions
Min
4.5
VEN=0V
0.1
1.0
µA
0.810
0.835
V
0.785
0.972
VFB=0.85V
-0.1
ILEAK
VIN=23V,
VEN=0V
Switch Current Limit
ILIM
1.8
VENH
1.5
Oscillator Frequency
V
0.1
0.385
0.1
10
3.3
3.8
4.3
0.2
fOSC1
1.1
1.4
µA
A
0.4
VIN Rising
µA
Ω
2.4
VENL
VHYS
V
mA
Switch Leakage Current
Input UVLO Hysteresis
23
1.1
ISW=1A
VUVLO
Unit
0.8
RDSON
Input UVLO Threshold
Max
VFB=0.9V
Switch On-resistance
EN Pin Threshold
Typ
V
V
V
1.7
MHz
fOSC2
Short Circuit
460
kHz
Max. Duty Cycle
DMAX
VFB=0.6V
90
%
Min. Duty Cycle
DMIN
VFB=0.9V
0
%
Minimum On Time
tON
100
ns
Thermal Shutdown
TOTSD
160
ºC
Thermal Shutdown Hysteresis
THYS
20
ºC
tSS
200
µs
Soft-start Time
Note 2: RDSON , tON, TOTSD, THYS and tSS are guaranteed by design.
Aug. 2012
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
5
Preliminary Datasheet
1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER
AP3211H
Typical Performance Characteristics
TA=25ºC, VIN=12V, VOUT=3.3V, unless otherwise noted.
100
1.00
90
0.96
80
Quiescent Current (mA)
0.92
Efficiency (%)
70
60
50
40
30
20
0.88
0.84
0.80
0.76
0.72
10
0
0.01
0.1
0.68
-60
1
-40
-20
0
Output Current (A)
3.40
0.88
3.36
0.80
3.32
Output Voltage (V)
Feedback Voltage (V)
60
80
100
120
140
160
Figure 5. Quiescent Current vs. Case Temperature
0.96
0.72
0.64
0.56
0.48
3.28
3.24
3.20
3.16
-40
-20
0
20
40
60
80
100
120
140
3.12
0.0
160
o
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
Output Current (A)
Case Temperature ( C)
Figure 6. Feedback Voltage vs. Case Temperature
Aug. 2012
40
o
Figure 4. Efficiency vs. Output Current
0.40
-60
20
Case Temperature ( C)
Figure 7. Output Voltage vs. Output Current
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
6
Preliminary Datasheet
1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER
AP3211H
Typical Performance Characteristics (Continued)
TA=25ºC, VIN=12V, VOUT=3.3V, unless otherwise noted.
VOUT_AC
(10mV/div)
IL
(500mA/div)
VSW
(5V/div)
VOUT_AC
(100mV/div)
IOUT
(500mA/div)
Time (400ns/div)
Time (200μs/div)
Figure 8. Output Ripple (IOUT=1.5A)
Figure 9. Load Transient (IOUT=1A to 1.5A)
VEN
(5V/div)
VOUT
(2V/div)
VEN
(5V/div)
VOUT
(2V/div)
VSW
(5V/div)
VSW
(5V/div)
Time (40μs/div)
Time (100μs/div)
Figure 10. Enable Turn on Characteristic
Aug. 2012
Figure 11. Enable Turn off Characteristic
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER
AP3211H
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)
VSW
(5V/div)
VSW
(5V/div)
Time (100μs/div)
Time (100μs/div)
Figure 12. Short Circuit Protection (IOUT=1A)
Aug. 2012
Figure 13. Short Circuit Recovery (IOUT=1A)
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER
AP3211H
Typical Application
VIN=12V
5
IN
AP3211H
C1
10 F
25V
4
ON OFF
EN
1
BS
CB
10nF
L1 4.7 H
6
SW
D1
R1
49.9kΩ
VOUT=3.3V
(1.5A)
C2
22 F
6.3V
3
FB
GND
R2
16.2kΩ
2
Figure 14. Typical Application Circuit of AP3211H
Aug. 2012
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
9
Preliminary Datasheet
1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER
AP3211H
Mechanical Dimensions
SOT-23-6
Unit: mm(inch)
0°
2.820(0.111)
8°
3.020(0.119)
0.300(0.012)
0.400(0.016)
5
4
2
3
0.300(0.012)
0.600(0.024)
1.500(0.059)
1.700(0.067)
2.650(0.104)
2.950(0.116)
6
0.200(0.008)
Pin 1 Mark
1
0.700(0.028)REF
0.950(0.037)TYP
0.000(0.000)
0.150(0.006)
1.800(0.071)
2.000(0.079)
0.100(0.004)
0.200(0.008)
0.900(0.035) 1.450(0.057)
MAX
1.300(0.051)
Aug. 2012
Rev. 1. 0
BCD Semiconductor Manufacturing Limited
10
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