BCDSEMI AP3406A

Data Sheet
1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER
General Description
Features
The AP3406A is a 1.1MHz fixed frequency, current
mode, PWM synchronous buck (step-down) DC-DC
converter, capable of driving a 800mA load with high
efficiency, excellent line and load regulation. The
device integrates a main switch and a synchronous
switch without an external Schottky diode. It is ideal
for powering portable equipment that runs from a
single Li-ion battery.
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A standard series of inductors are available from
several different manufacturers optimized for use
with the AP3406A. This feature greatly simplifies the
design of switch-mode power supplies.
AP3406A
High Efficiency: up to 95%
Output Current: 800mA
Input Voltage Range: 2.5V to 5.5V
Fixed 1.1MHz Frequency
Current Mode Control
100% Duty Cycle in Dropout
Built-in Short Circuit Protection
Built-in Thermal Shutdown Function
Built-in Current Limit Function
Shutdown Current: <1µA
Applications
This IC is available in TSOT-23-5 and MSOP-10
packages.
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TSOT-23-5
GPS
WiFi Card
Portable Media Player
Digital Still and Video Cameras
MSOP-10
Figure 1. Package Types of AP3406A
May 2009
Rev. 1. 2
BCD Semiconductor Manufacturing Limited
1
Data Sheet
1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER
AP3406A
Pin Configuration
EN
1
GND
2
KT Package
MM Package
TSOT-23-5
MSOP-10
5
3
SW
4
PGND
VIN
1
10
NC
2
9
SW
GND
3
8
EN
NC
4
7
NC
FB
5
6
NC
FB
VIN
Figure 2. Pin Configuration of AP3406A (Top View)
Pin Description
Pin Number
TSOT-23-5
MSOP-10
Pin Name
1
8
EN
2
3
GND
3
9
SW
4
1
VIN
5
5
FB
2, 4, 6, 7
NC
10
PGND
May 2009
Function
Control input pin. Forcing this pin above 1.5V enables the IC.
Forcing this pin below 0.6V shuts down the IC. When the IC is in
shutdown mode, all functions are disabled to decrease the supply
current below 1µA
Ground pin
Power switch output pin. Inductor connection to drain of the
internal PFET and NFET switches
Supply input pin. Bypass to GND with a 10µF or greater ceramic
capacitor
Feedback pin. Connect it with an external resistor divider network
to program the system output voltage
No connection
Power ground pin
Rev. 1. 2
BCD Semiconductor Manufacturing Limited
2
Data Sheet
1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER
AP3406A
Functional Block Diagram
Figure 3. Functional Block Diagram of AP3406A
Ordering Information
AP3406A
G1: Green
Circuit Type
TR: Tape & Reel
Package
KT: TSOT-23-5
MM: MSOP-10
Package
TSOT-23-5
MSOP-10
Temperature
Range
-40 to 85°C
ADJ: Adjustable Voltage
Part Number
Marking ID
Packing Type
AP3406AKT-ADJTRG1
L2A
Tape & Reel
AP3406AMM-ADJTRG1
3406AMM-G1
Tape & Reel
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant
and green.
May 2009
Rev. 1. 2
BCD Semiconductor Manufacturing Limited
3
Data Sheet
1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER
AP3406A
Absolute Maximum Ratings (Note 1)
Parameter
Symbol
Value
Unit
Input Voltage
VIN
-0.3 to 6
V
Feedback Voltage
VFB
-0.3 to VIN +0.3
V
EN Pin Voltage
VEN
-0.3 to VIN+0.3
V
SW Pin Voltage
VSW
-0.3 to VIN+0.3
V
Thermal Resistance
θJA
Operating Junction Temperature
TJ
125
ºC
Storage Temperature
TSTG
-65 to 150
ºC
Lead Temperature (Soldering, 10sec)
TLEAD
260
ºC
TSOT-23-5
250
MSOP-10
135
ºC/W
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
2.5
5.5
V
IOUT (MAX)
800
TA
-40
Maximum Output Current
Operating Ambient Temperature
May 2009
Rev. 1. 2
mA
85
ºC
BCD Semiconductor Manufacturing Limited
4
Data Sheet
1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER
AP3406A
Electrical Characteristics
VIN =VEN=3.6V, TA=25℃, unless otherwise specified. Specifications with boldface type apply over full
operating temperature range from -40 to 85ºC.
Parameters
Symbol
Supply Current
ICC
Shutdown Supply Current
Under Voltage
Threshold
Under Voltage
Hysteresis
Lockout
Lockout
Conditions
Typ
Max
Unit
VFB=0.55V
400
600
µA
ISHDN
VEN=0V, VIN=5.5V
0.01
1
µA
VUVLO
Rising edge
2.27
V
200
mV
VHUVLO
Feedback Bias Current
IFB
VFB=0.65V
Feedback Voltage
VFB
IOUT=100mA
Maximum Output Current
IOUT (MAX)
Switch Current Limit
ILIM
Oscillator Frequency
fOSC
Soft-start Time
VFB=0.55V
0.5
50
nA
0.588/
0.582
0.600
0.612/
0.618
V
800
mA
800
800
0.95
1.25
0.8
1.1
On
On
A
1.4
0.6
VENH
EN Pin Input Leakage
Current
Maximum Duty Cycle
VIN=2.5V,
VOUT=0.9V
VIN=3.6V,
VOUT=1.2V
VIN=4.6V,
VOUT=3.3V
-50
VENL
EN Pin Threshold
Internal
PFET
Resistance
Internal
NFET
Resistance
Min
1.5
MHz
V
IH
VEN=3.6V
-0.1
0.1
µA
IL
VEN=0V
-0.1
0.1
µA
RDSONP
ISW=100mA
0.44
Ω
RDSONN
ISW=-100mA
0.29
Ω
VFB=0.55V
100
%
VEN=0V to VIN
IOUT=50mA
220
µs
DMAX
TSS
Thermal Shutdown
Threshold
TOTSD
160
ºC
Thermal Shutdown
Hysteresis
THYS
30
ºC
May 2009
Rev. 1. 2
BCD Semiconductor Manufacturing Limited
5
Data Sheet
1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER
AP3406A
Typical Performance Characteristics
L=10µH, CIN=COUT=10µF, TA=25oC, unless otherwise noted.
0.7
1.4
0.6
Supply Current (mA)
Frequency (MHz)
1.3
1.2
1.1
1.0
0.5
0.4
VIN=3.6V
0.3
VOUT=1.8V
0.9
VIN=3.6V
IOUT=0A
0.8
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
VFB=0.55V
0.2
-60
6.0
-40
-20
0
Input Voltage (V)
40
60
80
100
120
140
160
o
Figure 5. Supply Current vs. Temperature
Figure 4. Frequency vs. Input Voltage
2.0
2.0
1.8
1.8
1.6
1.6
1.4
1.4
Output Voltage (V)
Current Limit (A)
20
Temperature ( C)
1.2
1.0
0.8
1.2
1.0
0.8
0.6
0.6
0.4
VIN=3.6V
0.2
VFB=0.55V
0.0
-60
-40
-20
0
20
40
60
80
VOUT=1.8V
0.2
0.0
0.0
100
0.2
0.4
0.6
0.8
1.0
1.2
1.4
Output Current (A)
O
Temperature ( C)
Figure 6. Current Limit vs. Temperature
May 2009
VIN=3.6V
0.4
Figure 7. Output Voltage vs. Output Current
Rev. 1. 2
BCD Semiconductor Manufacturing Limited
6
Data Sheet
1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER
AP3406A
Typical Performance Characteristics (Continued)
400ns/div
VSW
2V/div
VSW
2V/div
VOUT
20mV/div
VOUT
20mV/div
400ns/div
400ns/div
Figure 8. Light Load Operation
Figure 9. Heavy Load Operation
(VIN=3.6V, VOUT=1.8V, IOUT=800mA)
(VIN=3.6V, VOUT=1.8V, IOUT=0mA)
IIN
500mA/div
IOUT
500mA/div
VOUT
2V/div
VOUT
100mV/div
VEN
2V/div
200µs/div
400µs/div
Figure 10. Load Transient
(VIN=3.6V, VOUT=1.8V, IOUT=0mA to 800mA)
May 2009
Figure 11. Start up from Shutdown
(VIN=3.6V, VOUT=1.8V, RLOAD=2.5Ω)
Rev. 1. 2
BCD Semiconductor Manufacturing Limited
7
Data Sheet
1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER
AP3406A
Typical Performance Characteristics (Continued)
VOUT
1V/div
VOUT
1V/div
VSW
2V/div
VSW
2V/div
IL
1A/div
IL
1A/div
10µs/div
40µs/div
Figure 12. Short Circuit Protection
(VIN=3.6V, VOUT=1.8V, no load)
Figure 13. Short Circuit Recovery
(VIN=3.6V, VOUT=1.8V, no load)
1.0
1.0
0.9
0.9
0.8
0.8
TSOT-23-5
MSOP-10
0.7
Efficiency (%)
Efficiency (%)
0.7
0.6
0.5
0.4
0.3
V IN =3.6V
0.2
V OUT =1.8V
0.5
0.4
V OUT =3.3V
L=10 µH
0.1
0.0
0.1
V IN =4.2V
0.2
0.1
1
0.1
1
Output Current (A)
Output Current (A)
Figure 14. Efficiency vs. Output Current
May 2009
0.6
0.3
L=10 µ H
0.0
TSOT-23-5
MSOP-10
Figure 15. Efficiency vs. Output Current
Rev. 1. 2
BCD Semiconductor Manufacturing Limited
8
Data Sheet
1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER
AP3406A
Typical Performance Characteristics (Continued)
Normalized Feedback Voltage (%)
2.0
1.5
1.0
0.5
0.0
-0.5
-1.0
VIN=3.6V
VOUT=1.8V
-1.5
-2.0
-60
-40
-20
0
20
40
60
80
100
o
Temperature ( C)
Figure 16. Normalized Feedback Voltage vs. Temperature
Typical Application
EN
VIN
150k
300k
R2
R1
FB
VIN
2.5V to 5.5V
CIN
10µF
SW
AP3406A-ADJ
VOUT
L
10µH
COUT
10µF
GND
1.8V
800mA
Figure 17. Typical Application of AP3406A
May 2009
Rev. 1. 2
BCD Semiconductor Manufacturing Limited
9
Data Sheet
1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER
AP3406A
Mechanical Dimensions
TSOT-23-5
May 2009
Rev. 1. 2
Unit: mm(inch)
BCD Semiconductor Manufacturing Limited
10
Data Sheet
1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER
AP3406A
Mechanical Dimensions (Continued)
MSOP-10
May 2009
Rev. 1. 2
Unit: mm(inch)
BCD Semiconductor Manufacturing Limited
11
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of any its products or circuits. BCD Semiconductor Manufacturing Limited does not convey any license under its patent rights or
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