APW7212
1MHz, High-Efficiency, Step-Up Converter with Load Disconnection
Features
•
•
•
•
•
•
•
•
•
Wide 0.8V to V
OUT
Input Voltage Range
Low 1.05V (typical) Start-Up Voltage
Low 40µA No Load Bias Current
100mA Output from a Single AA Cell Input
250mA Output from a Dual AA Cell Input
Internal Synchronous Rectifier
Up to 92% Efficiency
<1µA Quiescent Current during Shutdown
Current-Mode Operation with Internal Compen-
sation
- Stable with Ceramic Output Capacitors
- Fast Line Transient Response
General Description
The APW7212 is a synchronous rectifier, fixed switching
frequency (1MHz typical), and current-mode step-up
regulator. The device allows use of small inductors and
output capacitors for portable devices. The current-mode
control scheme provides fast transient response and
good output voltage accuracy.
At light loads, the APW7212 will automatically enter in
pulse frequency modulation(PFM) operation to reduce
the dominant switching losses. During PFM operation,
the IC consumes very low quiescent current and main-
tains high efficiency over the complete load range.
The
device has a 1.05V start-up voltage
and can operate with
input voltage down to 0.8V after start-up.
The APW7212 also includes current-limit and over-tem-
perature shutdown to prevent damage in the event of an
output overload.
The APW7212 is available in 2mmx2mm TDFN2x2-8 and
TSOT-23-6A packages.
•
•
•
•
•
•
Fixed 1MHz Oscillator Frequency
1.2A Current-Limit Protection
Built-In Soft-Start
Over-Temperature Protection with Hysteresis
Available in a 2mmx2mm TDFN2x2-8 and TSOT-
23-6A Packages
Halogen and Lead Free Available
(RoHS Compliant)
Simplified Application Circuit
L1
V
IN
0.8V to V
OUT
4.7µH
C1
4.7µF
8 SW
1
VIN
VOUT 2
R1
FB 4
R2
GND 6
GND 7
V
OUT
Applications
•
•
•
•
Cell Phone and Smart Phone
PDA, PMP, and MP3
Digital Camera
Boost Regulator
APW7212
3 EN
5 PS
C2
22µF
PFM/
PWM
PWM
Pin Configuration
VIN
VOUT
EN
FB
1
2
3
4
8
7
6
5
SW
GND
GND
PS
SW 1
GND 2
FB 3
TSOT-23-6A
(Top View)
6 VIN
5 VOUT
4 EN
TDFN2x2-8
(Top View)
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and
advise customers to obtain the latest version of relevant information to verify before placing orders.
Copyright
©
ANPEC Electronics Corp.
Rev. A.4 - Apr., 2012
1
www.anpec.com.tw
APW7212
Ordering and Marking Information
APW7212
Assembly Material
Handling Code
Temperature Range
Package Code
7212
X
W12X
Package Code
QB : TDFN2x2-8 CT : TSOT-23-6A
Operating Ambient Temperature Range
I : -40 to 85
o
C
Handling Code
TR : Tape & Reel
Assembly Material
G: Halogen and Lead Free Device
X - Date Code
X - Date Code
APW7212 QB:
APW7212 CT:
Note: ANPEC lead-free products contain molding compounds/die attach materials and 100% matte tin plate termination finish; which
are fully compliant with RoHS. ANPEC lead-free products meet or exceed the lead-free requirements of IPC/JEDEC J-STD-020D for
MSL classification at lead-free peak reflow temperature. ANPEC defines “Green” to mean lead-free (RoHS compliant) and halogen
free (Br or Cl does not exceed 900ppm by weight in homogeneous material and total of Br and Cl does not exceed 1500ppm by
weight).
Absolute Maximum Ratings
Symbol
V
IN
V
OUT
V
SW
VIN Supply Voltage (VIN to GND)
VOUT to GND Voltage
SW to GND Voltage
FB, EN and PS to GND Voltage
T
J
T
STG
T
SDR
Maximum Junction Temperature
Storage Temperature
(Note 1)
Rating
-0.3 ~ 7
-0.3 ~ 7
-0.3 ~ 7
-0.3 ~ 7
150
-65 ~ 150
260
Unit
V
V
V
V
°C
°C
°C
Parameter
Maximum Lead Soldering Temperature, 10 Seconds
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Thermal Characteristics
Symbol
θ
JA
Parameter
Thermal Resistance -Junction to Ambient
(Note 2)
TDFN2x2-8
TSOT-23-6A
85
220
°C/W
Typical Value
Unit
Note 2:
θ
JA
is measured with the component mounted on a high effective thermal conductivity test board in free air. The exposed pad
of package is soldered directly on the PCB.
Copyright
©
ANPEC Electronics Corp.
Rev. A.4 - Apr., 2014
2
www.anpec.com.tw
APW7212
Recommended Operating Conditions
(Note 3)
Symbol
V
IN
VIN Input Voltage
EB, EN and PS to GND Voltage
L
C
IN
C
OUT
T
A
T
J
Inductor
Input Capacitor
Output Capacitor
Ambient Temperature
Junction Temperature
Parameter
Range
0.8 ~ V
OUT
-0.3 ~ V
OUT
+0.3
1.5 ~ 10
4.7 ~
3.7 ~
-40 ~ 85
-40 ~ 125
Unit
V
V
µH
µF
µF
°C
°C
Note 3: Refer to the application circuit for further information.
Electrical Characteristics
Refer to the typical application circuits. These specifications apply over V
IN
= 1.2V, V
OUT
= 3.3V, I
OUT
= 0mA, T
A
= -40°C to 85°C, unless
otherwise noted. Typical values are at T
A
= 25°C.
Symbol
Parameter
Test Conditions
APW7212
Min.
Typ.
Max.
Unit
SUPPLY VOLTAGE AND CURRENT
Minimum Start-up Voltage
V
IN
V
OUT
I
DD1
I
DD2
I
SD
Minimum Operating Voltage after
Stat-up
Output Voltage Range
No Switching Quiescent Current
VIN Quiescent Current
Shutdown Current
Measured form VOUT, V
FB
= 1.3V,
V
OUT
= 3.3V, T
A
=25°C
Measured from VIN, V
IN
= 1.2V, T
A
=25°C
V
EN
= GND, V
IN
= 1.2V
T
A
= 0 ~ 85°C
T
A
= -40 ~ 85°C
V
FB
= 1.3V
FB = GND
V
OUT
= 3.3V
V
OUT
= 5V
V
OUT
= 3.3V
V
OUT
= 5V
V
SW
= 5V
V
SW
= 0V, V
OUT
= 5V
R
L
= 3kΩ
V
EN
= V
IN
-
-
1.8
-
-
-
1.05
0.8
-
40
0.5
0.1
1.2
V
0.9
5.5
60
1
1
µA
V
µA
REFERENCE AND OUTPUT VOLTAGES
V
REF
I
FB
F
SW
R
N-FET
R
P-FET
Regulated Feedback Voltage
FB Input Current
Switching Frequency
N-FET Switch On Resistance
P-FET Switch On Resistance
N-FET Switch Leakage Current
P-FET Switch Leakage Current
I
LIM
D
MAX
N-FET Switch Current-Limit
Dead-Time
(Note 4)
-1.5%
-2%
-50
0.75
-
-
-
-
-
-
0.9
-
80
1.23
-
-
1
0.35
0.3
0.6
0.55
0.05
0.05
1.2
10
85
+1.5%
+2%
50
1.25
-
-
-
-
1
1
-
-
95
V
nA
MHz
Ω
Ω
µA
µA
A
ns
%
INTERNAL POWER SWITCH
SW Maximum Duty Cycle
Copyright
©
ANPEC Electronics Corp.
Rev. A.4 - Apr., 2014
3
www.anpec.com.tw
APW7212
Electrical Characteristics (Cont.)
Refer to the typical application circuits. These specifications apply over V
IN
= 1.2V, V
OUT
= 3.3V, I
OUT
= 0mA, T
A
= -40°C to 85°C, unless
otherwise noted. Typical values are at T
A
= 25°C.
APW7212
Min.
-
1
-
1
V
EN
= 5V or GND
V
PS
= 5V or GND
-
-
Typ.
-
-
-
-
0.4
0.1
Max.
0.4
-
0.4
-
1
1
Symbol
CONTROL STAGE
EN
PS
Parameter
Test Conditions
Unit
EN Input Low Threshold
EN Input High Threshold
PS Input Low Threshold
PS Input High Threshold
V
V
µA
µA
I
EN
I
PS
EN Input Leakage Current
PS Input Leakage Current
OVER-TEMPERATURE PROTECTION
T
OTP
Over-Temperature
Protection
(Note 4)
Over-Temperature
Protection Hysteresis
(Note 4)
Note 4: Guaranteed by design, not production tested.
T
J
Rising
-
-
150
30
-
-
°C
°C
Copyright
©
ANPEC Electronics Corp.
Rev. A.4 - Apr., 2014
4
www.anpec.com.tw
APW7212
Typical Operating Characteristics
(Refer to the application circuit in the section"Typical Application Circuits", V
IN
=1.5V, V
OUT
=3.3V, T
A
=25
o
C unless
otherwise specified )
Efficiency vs. Load Current
Efficiency vs. Load Current
100
90
80
Efficiency (%)
Efficiency (%)
100
90
80
70
70
60
50
40
30
20
10
0
0.1
1
10
100
1000
Load Current, I
OUT
(mA)
V
IN
=1.8V
V
IN
=2.4V
60
50
40
30
20
10
0
0.1
1
10
100
1000
Load Current, I
OUT
(mA)
400
V
IN
=2.4V
V
IN
=1.8V
V
IN
=1.2V
V
OUT
= 4V
L = 4.7µH
C
OUT
= 22µF
.
V
IN
=1.2V
V
IN
=0.9V
V
OUT
= 3.3V
L = 4.7µH
C
OUT
= 22µF
Efficiency vs. Load Current
100
No Load Input Current, I
IN
(uA)
No Load Input Current vs. Supply
Voltage
90
80
70
Efficiency (%)
60
50
40
30
20
10
0
0.1
1
10
100
1000
Load Current, I
OUT
(mA)
V
IN
=1.2V
V
IN
=2.4V
V
IN
=1.8V
V
IN
=3.6V
350
300
250
200
150
100
50
0
0
0.5
1
1.5
2
2.5
3
3.5
Supply Voltage, V
IN
(V)
V
OUT
= 3.3V
L = 4.7µH
C
OUT
= 22µF
V
OUT
= 5V
L = 4.7µH
C
OUT
= 22µF
Start-up Voltage vs. Load Current
300
250
Load Current, I
OUT
(mA)
200
150
100
50
0
0
0.5
1
1.5
2
2.5
3
3.5
V
OUT
= 3.3V
L = 4.7µH
C
OUT
= 22µF
Start-up Voltage, V
IN
(V)
Copyright
©
ANPEC Electronics Corp.
Rev. A.4 - Apr., 2014
5
www.anpec.com.tw
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