APW7077/A
PWM Step-Up DC-DC Converter
Features
•
•
•
•
•
•
•
•
•
Low Start-up Voltage 0.9V
Fixed 300kHZ Operating Frequency
Built-In Internal Soft Start Circuit
Low Operating Current
3.3V and 5V (
±
2.5%) Fixed (APW7077) or
Adjustable Output Voltage (APW7077A)
High Efficiency Up to 88% at 400mA
Output Current
High Output Current Up to 1A
Compact Package: SOT-23-5
Lead Free Available (RoHS Compliant)
General Description
The APW7077/A series are multi- function PWM
step-up DC-DC converter with an adaptive voltage mode
controller and higher efficiency application from one to
four cells battery packs. The APW7077/A series are
set PWM operating mode, voltage-mode to follow
portable application. And built-in driver pin, EXT pin,
for connecting to an external transistor or MOSFET
during light load, the device will automatically skip
switching cycles to maintain high efficiency. The
APW7077/A series consists of PW M controller,
reference voltage, phase compensation, oscillator,
soft-start, driver block. It will provide to operate suitable
voltage without external compensation circuit. The
APW7077/A series have fixed voltage and adjustable
voltage version from a wide input voltage ranges 0.7V
to 5.5V for step-up DC-DC converter. The start-up is
guaranteed at 1V and the device is operating down to
0.7V. And providing up to 300mA loading current.
Besides, low quiescent current (switch-off) is
guaranteed.
Applications
•
•
•
•
•
Cellular and Portable Phones
Portable Audio
Camcorders and Digital Still Camera
Hand-held Instrument
PDAs
Pinouts
EXT
GND
EXT
GND
5
1
2
4
3
5
1
2
4
3
C E V
OUT
NC
FB V
DD
CE
SOT-23-5 (Top View)
APW7077
SOT-23-5 (Top View)
APW7077A
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 - Sep, 2005
1
www.anpec.com.tw
APW7077/A
Ordering and Marking Information
APW7077/A
Lead Free Code
Handling Code
Temp. Range
Package Code
Voltage Code
Package Code
B : SOT-23-5
Temp. Range
I : -40 to 85
°
C
Handling Code
TU : Tube
TR : Tape & Reel
Voltage Code
R : 3.3V
Z : 5.0V
Lead Free Code
L : Lead Free Device
Blank : Original Device
APW7077A B :
A77X
X - Date Code
APW7077 B :
77RX
XX - Date Code, R : 3.3V
Note: ANPEC lead-free products contain molding compounds/die attach materials and 100% matte tin plate
termination finish; which are fully compliant with RoHS and compatible with both SnPb and lead-free soldiering
operations. ANPEC lead-free products meet or exceed the lead-free requirements of IPC/JEDEC J STD-020C
for MSL classification at lead-free peak reflow temperature.
Block Diagram
V
DD
V
OUT
V
DD
Phase
Compensation
V
DD
NC
PWM
Controller
Error Amp.
Vref=1.0V
RAMP
GEN.
PWM Comp.
Oscillator
Driver
EXT
GND
V
DD
Voltage
Reference
Soft-Start
CE
APW 7077
V
DD
Phase
Compensation
V
DD
V
DD
V
DD
FB
PWM
Controller
Error Amp.
RAMP
GEN.
PWM Comp.
Oscillator
Driver
EXT
GND
V
DD
Voltage
Reference
Soft-Start
CE
APW7077A
Copyright
©
ANPEC Electronics Corp.
Rev. A.4 - Sep, 2005
2
www.anpec.com.tw
APW7077/A
Absolute Maximum Ratings
Symbol
V
DD
V
IO
T
A
T
J
T
STG
T
S
V
ESD
Supply voltage
Input / output pins (CE, FB, EXT)
Operating Ambient Temperature Range
Junction Temperature Range
Storage Temperature Range
Soldering Temperature
Minimum ESD Rating
Parameter
Value
-0.3 to 7
-0.3 to 7
-40 to 85
-40 to 150
-65 to +150
300, 10 seconds
±
2
Unit
V
V
°C
°C
°C
°C
kV
Pin Descrpition
Pin Number
APW7077
1
5
4
X
X
3
2
APW7077A
3
5
4
2
1
X
X
Pin Name
CE
EXT
GND
V
DD
FB
NC
V
OUT
Function Description
Chip enable input. High = operating mode; Low = shutdown mode
External MOSFET or transistor drive pin.
Ground pins of the circuit.
Supply voltage.
FB: Internal 1.0V reference voltage. Use a resistor divider to set
the output voltage from and V
OUT
=
No internal connection to the pin.
V
OUT
Provides bootstrap power to the IC.
R2
1
+
R1
V
FB
.
Thermal Characteristics
Symbol
R
θ
JA
Parameter
Thermal Resistance
−
Junction to Ambient
SOT-23-5
Value
200
Unit
°
C/W
Copyright
©
ANPEC Electronics Corp.
Rev. A.4 - Sep, 2005
3
www.anpec.com.tw
APW7077/A
Electrical Characteristics
(for all values T
A
= 25
°
C, V
OUT
= 3.3V, unless otherwise noted)
APW7077A
Min
Typ
Max
Symbol
Step-Up Section
V
IN
V
DD
Parameter
Test Condition
Unit
Minimum Operating Input
Voltage
Operating Voltage
Start-up Voltage
V
OUT
= V
DD
V
IN
= V
DD
Io<10mA, V
OUT
= V
DD
(<5.5V)
V
OUT
= 12V, Io<10mA, V
DD
= V
IN
1.9
270
V
DD
= 3.3V, VFB = 0.5V
2.0V<V
DD
<5.5V
V
FB
= 0.5V
81
1.9
0.9
5.5
0.9
2.0
300
±1.2
88
±0.5
-70
80
2.0
0.98
1
±0.1
0.03
10
25
1.65
150
150
100
17
1
1.2
230
150
25
2
0.7
50
40
1.02
-110
120
-150
160
95
330
1
V
V
V
V
KHZ
%
%
%
mA
mA
V
V
%
nA
ms
V
mV
µA
µA
µA
µ
A
V
V
µA
nA
f
SW
D
MAX
Operating Frequency
Oscillator Frequency Line
Regulation
Maximum Duty Cycle
Maximum Duty Line Regulation 2.0V<V
DD
<5.5V
Power MOSFET
I
SOURCE
EXT Output Source Current
I
SINK
EXT Output Sink Current
Output Voltage Range
V
FB
Feedback Voltage
Feedback Voltage Line
Regulation
I
FB
T
SS
Feedback Input Current
Soft-start Time
Soft-start Threshold Voltage
Soft-start Hysteresis Voltage
Iq
I
OFF
V
CE
I
CE
Operating Current
Stand-by Current
Switch-off Current
Logic LOW (V
IL
)
Logic HIGH(V
IH
)
CE Pin Input Current
V
CE
= 0V
V
CE
= 3.3V
V
DD
= V
CE
= 3.3V, V
FB
= 0.5V
V
DD
= V
CE
= 3.3V, V
FB
= 1.1V
V
DD
= V
CE
= 3.3V, V
FB
= 1.3V
V
DD
= 3.3V, V
CE
= 0V
Duty = 50%
Control Section
External Divider
I
LOAD
= 0mA
2.0V<V
DD
<5.5V
V
FB
= 1.4V
Duty
≤
5%, EXT = V
DD
-0.4V
Duty
≤
5%, EXT = 0.4V
1
0.07
2
50
Copyright
©
ANPEC Electronics Corp.
Rev. A.4 - Sep, 2005
4
www.anpec.com.tw
APW7077/A
Electrical Characteristics (Cont.)
(for all values T
A
= 25
°
C, V
OUT
= 3.3V, unless otherwise noted)
APW7077
Min
Typ
Max
Symbol
Step-Up Section
V
IN
Parameter
Test Condition
Unit
Minimum Operating Input
Voltage
Operating Voltage
APW7077_33, Io<10mA
Start-up Voltage
APW7077_33, 10mA<Io<100mA
APW7077_50, Io<10mA
APW7077_50, 10mA<Io<100mA
I
LOAD
= 10mA
V
OUT
= 3.3VX96%
V
OUT
= 3.3VX96%
0.7
1
0.9
1.1
0.9
1.1
0.7
270
81
-70
80
3.218
4.875
10
300
88
-110
120
3.3
5
25
1.65
150
V
CE
= V
OUT
, V
OUT
= 0.96V
OUT
V
CE
= V
OUT
, V
OUT
= 1.04V
OUT
V
CE
= V
OUT
, V
OUT
= 1.3V
OUT
V
CE
= 0V
1.2
V
CE
= 0V
V
CE
= 2.0V
1
0.07
2
50
200
160
35
1
300
240
55
2
0.7
0.8
330
95
-150
160
3.383
5.125
40
5.5
V
V
V
V
V
V
V
KHZ
%
mA
mA
V
V
ms
V
mV
µ
A
µ
A
µ
A
µ
A
V
V
µA
nA
V
HOLD
f
SW
D
MAX
Hold Voltage
Operating Frequency
Maximum Duty Cycle
Power MOSFET
I
SOURCE
EXT Output Source Current Duty≤5%, EXT = 2.9V
I
SINK
V
OUT
T
SS
EXT Output Sink Current
APW7077-33
APW7077-50
Soft-start Time
Soft-start Threshold Voltage Duty = 50%
Soft-start Hysteresis Voltage
Iq
I
OFF
V
CE
I
CE
Operating Current
Stand-by Current
Switch-off Current
Logic LOW (V
IL
)
Logic HIGH (V
IH
)
CE Pin Input Current
Duty≤5%, EXT = 0.4V
I
IN
= 0mA
I
IN
= 0mA
Control Section
Copyright
©
ANPEC Electronics Corp.
Rev. A.4 - Sep, 2005
5
www.anpec.com.tw
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