1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A
Data Sheet
General Description
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.
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.
This IC is available in TSOT-23-5, MSOP-10 and
DFN-2×2-6(1) packages.
Features
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
• GPS
• WiFi Card
• Portable Media Player
• Digital Still and Video Cameras
TSOT-23-5 MSOP-10 DFN-2×2-6(1)
Figure 1. Package Types of AP3406A
Feb. 2013 Rev. 1. 5 BCD Semiconductor Manufacturing Limited
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Data Sheet
1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A
Pin Configuration
KT Package MM Package DN Package
TSOT-23-5 MSOP-10 DFN-2×2-6(1)
P in 1 Mark
EN
GND
1
2
5
SW
34
FB
VIN
VIN
NC
GND
NC
FB
1
2
3
4
5
10
Figure 2. Pin Configuration of AP3406A (Top View)
Pin Description
Pin Number
Pin Name Function
TSOT-23-5 MSOP-10 DFN-2×2-6(1)
1 8 2 EN
2 3 5 GND Ground pin
3 9 4 SW
4 1 3 VIN
5 5 6 FB
2, 4, 6, 7 1 NC No connection
PGND
9
SW
8
EN
NC
7
6
NC
NC
EN
VIN
1
2
3
6
FB
GND
5
4
SW
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
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
10 PGND Power ground pin
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Data Sheet
1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A
Functional Block Diagram
Figure 3. Functional Block Diagram of AP3406A
Ordering Information
AP3406A -
Circuit Type
Package
KT: TSOT-23-5
MM: MSOP-10
DN: DFN-2×2-6(1)
Package
TSOT-23-5
MSOP-10 AP3406AMM-ADJTRG1 3406AMM-G1 Tape & Reel
DFN-2×2-6(1) AP3406ADN-ADJTRG1 BA Tape & Reel
Temperature
Range
-40 to 85°C
Part Number Marking ID Packing Type
AP3406AKT-ADJTRG1 L2A Tape & Reel
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS
compliant and green.
G1: Green
TR: Tape & Reel
ADJ: Adjustable Voltage
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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
TSOT-23-5 250
Thermal Resistance
Operating Junction Temperature TJ 150 ºC
Storage Temperature T
Lead Temperature (Soldering, 10sec) T
θ
JA
-65 to 150 ºC
STG
260 ºC
LEAD
MSOP-10 135
DFN-2×2-6(1) 100
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
Maximum Output Current I
Operating Ambient Temperature TA -40 85 ºC
OUT (MAX)
800 mA
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Data Sheet
1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A
Electrical Characteristics
V
IN =VEN
operating temperature range from -40 to 85ºC.
Parameters Symbol Conditions Min Typ Max Unit
Supply Current ICC VFB=0.55V 400 600
=3.6V, T
=25℃, unless otherwise specified. Specifications with boldface type apply over full
A
µA
Shutdown Supply Current I
Under Voltage Lockout
Threshold
Under Voltage Lockout
Hysteresis
VEN=0V, VIN=5.5V 0.01 1
SHDN
V
UVLO
V
HUVLO
Rising edge 2.27 V
200 mV
µA
Feedback Bias Current IFB VFB=0.65V -50 0.5 50 nA
Feedback Voltage VFB I
Maximum Output Current
I
OUT (MAX)
=100mA
OUT
V
=2.5V,
IN
V
OUT
VIN=3.6V,
V
OUT
VIN=4.6V,
V
OUT
Switch Current Limit I
Oscillator Frequency f
EN Pin Threshold
EN Pin Input Leakage
Current
Internal PFET On
Resistance
Internal NFET On
Resistance
Maximum Duty Cycle D
Soft-start Time TSS
Thermal Shutdown
Threshold
Thermal Shutdown
Hysteresis
VFB=0.55V 0.95 1.25 A
LIM
0.8 1.1 1.4 MHz
OSC
V
0.6
ENL
V
1.5
ENH
I
VEN=3.6V -0.1 0.1
H
IL VEN=0V -0.1 0.1
R
ISW=100mA 0.44 Ω
DSONP
R
ISW=-100mA 0.29 Ω
DSONN
VFB=0.55V 100 %
MAX
=0V to V
V
EN
I
＝50mA
OUT
T
160 ºC
OTSD
T
30 ºC
HYS
=0.9V
=1.2V
=3.3V
IN
0.588/
0.582
0.600
800
800
800
220
0.612/
0.618
V
mA
V
µA
µA
µs
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Data Sheet
1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A
Typical Performance Characteristics
L=10µH, CIN=C
=10µF, TA=25oC, unless otherwise noted.
OUT
1.4
1.3
1.2
1.1
1.0
0.9
0.8
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Input Voltage (V)
Figure 4. Frequency vs. Input Voltage
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
-60 -40 -20 0 20 40 60 80 100
Temperature (OC)
Figure 6. Current Limit vs. Temperature Figure 7. Output Voltage vs. Output Current
Frequency (MHz)
Current Limit (A)
VIN=3.6V
V
=1.8V
OUT
I
=0A
OUT
VIN=3.6V
VFB=0.55V
0.7
0.6
0.5
0.4
Supply Current (mA)
0.3
0.2
-60 -40 -20 0 20 40 60 80 100 120 140 160
Figure 5. Supply Current vs. Temperature
2.0
1.8
1.6
1.4
1.2
1.0
0.8
Output Voltage (V)
0.6
0.4
0.2
0.0
0.00.20.40.60.81.01.21.4
VIN=3.6V
V
=1.8V
OUT
VIN=3.6V
VFB=0.55V
Temperature (oC)
Output Current (A)
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Data Sheet
1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A
Typical Performance Characteristics (Continued)
VSW
2V/div
V
OUT
20mV/div
400ns/div
400ns/div 400ns/div
Figure 8. Light Load Operation Figure 9. Heavy Load Operation
(VIN=3.6V, V
OUT
=1.8V, I
=0mA) (VIN=3.6V, V
OUT
V
SW
2V/div
V
OUT
20mV/div
OUT
=1.8V, I
=800mA)
OUT
500mA/div
100mV/div
I
OUT
V
OUT
(V
=3.6V, V
IN
I
V
OUT
2V/div
V
2V/div
IN
EN
=1.8V, R
OUT
LOAD
=2.5Ω)
500mA/div
200µs/div 400µs/div
Figure 10. Load Transient Figure 11. Start up from Shutdown
OUT
=1.8V, I
=0mA to 800mA) (VIN=3.6V, V
OUT
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Data Sheet
1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A
Typical Performance Characteristics (Continued)
V
OUT
1V/div
V
SW
2V/div
IL
1A/div
V
OUT
1V/div
V
SW
2V/div
1A/div
I
L
10µs/div 40µs/div
Figure 12. Short Circuit Protection Figure 13. Short Circuit Recovery
(V
=3.6V, V
IN
=1.8V, no load) (VIN=3.6V, V
OUT
=1.8V, no load)
OUT
1.0
0.9
0.8
0.7
0.6
0.5
0.4
Efficiency (%)
0.3
0.2
0.1
0.0
TSOT-23-5
MSOP-10
0.1 1
Output Current (A)
VIN=3.6V
V
=1.8V
OUT
L=10µH
1.0
0.9
0.8
0.7
0.6
0.5
0.4
Efficiency (%)
0.3
0.2
0.1
0.0
TSOT-23-5
MSOP-10
0.1 1
Output Current (A)
VIN=4.2V
V
=3.3V
OUT
L=10µH
Figure 14. Efficiency vs. Output Current Figure 15. Efficiency vs. Output Current
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Data Sheet
1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A
Typical Performance Characteristics (Continued)
2.0
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
Normalized Feedback Voltage (%)
-2.0
-60 -40 -20 0 20 40 60 80 100
Temperature (oC)
VIN=3.6V
V
=1.8V
OUT
Figure 16. Normalized Feedback Voltage vs. Temperature
T ypical Application
R2
V
IN
2.5V to 5.5V
C
IN
10µF
EN
VIN
AP3406A-ADJ
Figure 17. Typical Application of AP3406A
FB
GND
SW
300k150k
R1
L
10µH
C
OUT
10µF
V
OUT
1.8V
800mA
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Data Sheet
1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A
Mechanical Dimensions
TSOT-23-5 Unit: mm(inch)
5
°
GAUGE PLANE
Feb. 2013 Rev. 1. 5 BCD Semiconductor Manufacturing Limited
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Data Sheet
1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A
Mechanical Dimensions (Continued)
MSOP-10 Unit: mm(inch)
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Data Sheet
1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A
Mechanical Dimensions (Continued)
DFN-2×2-6(1) Unit: mm(inch)
0.224(0.009)
0.376(0.015)
1.900(0.075)
2.100(0.083)
0.200(0.008)
MIN.
0.650(0.026)
TYP.
N4 N5 N6
0.250(0.010)
0.350(0.014)
0.550(0.022)
0.650(0.026)
Pin 1 Mark
0.000(0.000)
0.050(0.002)
0.152(0.006)
REF.
1.900(0.075)
2.100(0.083)
1.500(0.059)
1.700(0.067)
12
2
N2N3
DETAIL A
Pin 1 options
0.850(0.033)
1.050(0.041)
PIN #1 IDENTIFICATION
See DETAIL A
N1
1
1
2
Feb. 2013 Rev. 1. 5 BCD Semiconductor Manufacturing Limited
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BCD Semiconductor Manufacturing Limited
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