Anpec APW7212CT, APW7212QB Schematic [ru]
APW7212
1MHz, High-Efficiency, Step-Up Converter with Load Disconnection
Features
• Wide 0.8V to V
• 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
• 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)
Input Voltage Range
OUT
Applications
• Cell Phone and Smart Phone
• PDA, PMP, and MP3
• Digital Camera
• Boost Regulator
General Description
The APW7212 is a synchronous rectifier, fixed switching
frequency (1MHz typical), and c urrent-mode step-up
regulator. The devic e allows use of small inductors and
output capacitors for portable devices. The current-mode
control sc heme 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 maintains 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-temperature shutdown to prevent damage in the event of an
output overload.
The APW7212 is available in 2mmx2mm TDFN2x2-8 and
TSOT-23-6A packages.
Simplified Application Circuit
V
C2
22µF
OUT
V
IN
0.8V to V
OUT
PFM/
PWM
C1
4.7µF
PWM
L1
4.7µH
8
SW
1
VIN
APW7212
3
EN
5
PS
VOUT
FB
GND
GND
2
R1
4
R2
6
7
Pin Configuration
1
VIN
2
VOUT
3
EN
FB
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.2 - Feb., 2011
87SW
GND
6
GND
54
PS
SW 1
GND 2
FB 3
6 VIN
5 VOUT
4 EN
TSOT-23-6A
(Top View)
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APW7212
Ordering and Marking Information
APW7212
Assembly Material
Handling Code
Temperature Range
Package Code
APW7212 QB:
APW7212 CT: W12X
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).
7212
X
Package Code
QB : TDFN2x2-8 CT : TSOT-23-6A
Operating Ambient Temperature Range
I : -40 to 85oC
Handling Code
TR : Tape & Reel
Assembly Material
G: Halogen and Lead Free Device
X - Date Code
X - Date Code
Absolute Maximum Ratings (Note 1)
Symbol
VIN VIN Supply Voltage (VIN to GND) -0.3 ~ 7 V
V
VOUT to GND Voltage -0.3 ~ 7 V
OUT
VSW SW to GND Voltage -0.3 ~ 7 V
FB, EN and PS to GND Voltage -0.3 ~ 7 V
TJ Maximum Junction Temperature 150 °C
T
Storage Temperature -65 ~ 150 °C
STG
T
Maximum Lead Soldering Temperature, 10 Seconds 260 °C
SDR
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.
Parameter Rating Unit
Thermal Characteristics
Symbol
Thermal Resistance -Junction to Ambient
θJA
Note 2: θJA 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.2 - Feb., 2011
Parameter Typical Value Unit
(Note 2)
TDFN2x2-8
TSOT-23-6A
85
220
°C/W
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APW7212
Recommended Operating Conditions (Note 3)
Symbol
VIN VIN Input Voltage 0.8 ~ V
EB, EN and PS to GND Voltage -0.3 ~ V
Parameter Range Unit
V
OUT
+0.3 V
OUT
L Inductor 1.5 ~ 10
CIN Input Capacitor 4.7 ~
C
Output Capacitor 3.7 ~
OUT
TA Ambient Temperature -40 ~ 85 °C
TJ Junction Temperature -40 ~ 125 °C
Note 3: Refer to the application circuit for further information.
Electrical Characteristics
Refer to the typical application circuits. These specifications apply over VIN = 1.2V, V
otherwise noted. Typical values are at TA = 25°C.
Symbol
Parameter Test Conditions
SUPPLY VOLTAGE AND CURRENT
Minimum Start-up Voltage
VIN
Minimum Operating Voltage after
Stat-up
V
Output Voltage Range 1.8 - 5.5 V
OUT
I
No Switching Quiescent Current
DD1
I
VIN Quiescent Current Measured from VIN, VIN = 1.2V, TA=25°C - 0.5 1
DD2
RL = 3kΩ
VEN = VIN - 0.8 0.9
Measured form VOUT, VFB = 1.3V,
V
= 3.3V, TA=25°C
OUT
ISD Shutdown Current VEN = GND, VIN = 1.2V - 0.1 1
REFERENCE AND OUTPUT VOLTAGES
V
Regulated Feedback Voltage
REF
TA = 0 ~ 85°C -1.5% 1.23 +1.5%
TA = -40 ~ 85°C -2% - +2%
IFB FB Input Current VFB = 1.3V -50 - 50 nA
INTERNAL POWER SWITCH
FSW Switching Frequency FB = GND 0.75
V
= 3.3V - 0.35
R
N-FET Switch On Resistance
N-FET
R
P-FET Switch On Resistance
P-FET
OUT
V
= 5V - 0.3 -
OUT
V
= 3.3V - 0.6 -
OUT
V
= 5V - 0.55
OUT
N-FET Switch Leakage Current VSW = 5V - 0.05
P-FET Switch Leakage Current VSW = 0V, V
I
N-FET Switch Current-Limit 0.9 1.2 - A
LIM
Dead-Time
D
SW Maximum Duty Cycle 80 85 95 %
MAX
(Note 4)
= 5V - 0.05
OUT
= 3.3V, I
OUT
= 0mA, TA = -40°C to 85°C, unless
OUT
APW7212
Min. Typ. Max.
- 1.05 1.15
- 40 60
1 1.25 MHz
-
1
1
- 10 - ns
µH
µF
µF
Unit
V
µA
µA
V
Ω
Ω
µA
µA
Copyright ANPEC Electronics Corp.
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Rev. A.2 - Feb., 2011
APW7212
Electrical Characteristics (Cont.)
Refer to the typical application circuits. These specifications apply over VIN = 1.2V, V
otherwise noted. Typical values are at TA = 25°C.
= 3.3V, I
OUT
= 0mA, TA = -40°C to 85°C, unless
OUT
Symbol Parameter Test Conditions
APW7212
Min. Typ. Max.
CONTROL STAGE
EN EN Input Low Threshold - - 0.4
EN Input High Threshold 1 - -
PS PS Input Low Threshold - - 0.4
PS Input High Threshold 1 - IEN EN Input Leakage Current VEN = 5V or GND - 0.4 1
IPS PS Input Leakage Current VPS = 5V or GND - 0.1 1
OVER-TEMPERATURE PROTECTION
T
OTP
Note 4: Guaranteed by design, not production tested.
Over-Temperature
Protection
Over-Temperature
Protection Hysteresis
(Note 4)
(Note 4)
TJ Rising - 150 - °C
- 30 - °C
Unit
V
V
µA
µA
Copyright ANPEC Electronics Corp.
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Rev. A.2 - Feb., 2011
APW7212
Typical Operating Characteristics
(Refer to the application circuit in the section"Typical Application Circuits", VIN=1.5V, V
otherwise specified )
100
90
80
70
60
50
40
Efficiency (%)
30
20
VIN=0.9V
10
0
0.1 1 10
100
90
80
70
60
50
40
Efficiency (%)
30
20
VIN=1.2V
10
0
0.1 1 10 100 1000
Start-up Voltage vs. Load Current
300
Efficiency vs. Load Current
VIN=2.4V
VIN=1.8V
.
VIN=1.2V
V
OUT
L = 4.7µH
C
OUT
= 3.3V
= 22µF
100
Load Current, I
OUT
(mA)
Efficiency vs. Load Current
VIN=3.6V
VIN=2.4V
VIN=1.8V
V
OUT
L = 4.7µH
C
= 22µF
OUT
Load Current, I
OUT
(mA)
= 5V
1000
100
90
80
70
60
50
40
Efficiency (%)
30
20
10
0
400
350
(uA)
300
IN
250
200
150
100
No Load Input Current, I
50
Efficiency vs. Load Current
VIN=1.2V
0.1
1 10 100 1000
Load Current, I
No Load Input Current vs. Supply
V
= 3.3V
OUT
L = 4.7µH
C
= 22µF
0
OUT
0 0.5 1 1.5 2 2.5 3 3.5
Supply Voltage, VIN(V)
=3.3V, TA=25oC unless
OUT
VIN=2.4V
VIN=1.8V
V
= 4V
OUT
L = 4.7µH
C
= 22µF
OUT
(mA)
OUT
Voltage
250
(mA)
200
OUT
150
100
Load Current, I
50
0
0 0.5 1 1.5 2 2.5 3 3.5
Start-up Voltage, V
Copyright ANPEC Electronics Corp.
Rev. A.2 - Feb., 2011
V
OUT
L = 4.7µH
C
OUT
(V)
IN
= 3.3V
= 22µF
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APW7212
Operating Waveforms
(Refer to the application circuit in the section “Typical Application Circuits”, VIN=1.5V, V
otherwise specified)
Load Transient Response
V
,200mV/Div, AC
1
OUT
1
Load Transient Response
V
OUT
=3.3V,TA=25oC unless
OUT
,200mV/Div, AC
2
Time: 100µs/Div
1
2
3
Time: 500µs/Div
200mA
I
, 100mA/Div
OUT
L=4.7µH, VIN=1.5V, C
No Load Start-up
V
EN
V
, 1V/Div
OUT
IIN, 0.2A/Div
L=4.7µH, VIN=1.5V, I
OUT
Normal Operating Waveform
V
10mV/Div, AC
OUT,
VLX, 2V/Div, DC
100mA
=22µF
OUT
=0mA
OUT
2
Time: 100µs/Div
1
2
Time: 100µs/Div
1
L=4.7µH, VIN=1.5V, C
, 0.1A/Div
110mAI
10mA
Line Transient Response
2.5V
V
0.5V/Div1.5V
IN,
V
200mV/Div,AC
OUT,
I
= 100mA
OUT
Normal Operating Waveform
V
10mV/Div, AC
OUT,
VLX, 2V/Div, DC
OUT
=22µF
2
IL, 200mA/Div
3
Time: 500ns/Div
I
Copyright ANPEC Electronics Corp.
Rev. A.2 - Feb., 2011
= 200mA
OUT
2
3
Time: 10µs/Div
IL, 500mA/Div
I
OUT
= 20mA
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