APW7075
Step-Up Converter and LDO Combo
Features
•
•
•
•
Built-In a 500mA LDO and Synchronous Step-Up
DC-DC Converter
Built-In PWM/PFM Operating Mode
Provided Dual Input Power Sources
Connect FB to OUT for 3.3V Output Voltage or
GND for 2.5V Output Voltage or an External
Resistor Divider for Adjustable Output Voltage.
General Description
The APW7075 is a PWM/PFM, high-efficiency and
step-up DC-DC converter with an integrated LDO input
switch for dual mode application. During battery mode
operation, the APW7075 acts as synchronous recti-
fier and step-up DC-DC converter with a fixed or ad-
justable output voltage. When the VIN pin sense 5V
input voltage, the APW7075 is switched to LDO op-
eration mode, maintaining the constant output voltage.
The input voltage ranges from 0.6 V to 4.5V for step-
up DC-DC converter. The start-up is guaranteed at1V
and the device is operating down to 0.6V. When the
device is at LDO operating mode, the suitable output
voltage 3.3V and loading current 500mA for maximum
power consumption are guaranteed.
The APW7075 is suited for dual mode and portable
battery powered appliance with low-battery detector.
In dual-mode applications, the APW7075 draws power
from any available 5V USB connection and reverts to
battery power when the USB power is removed.
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•
•
•
•
•
•
•
•
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Fixed 300KHz Operating Frequency
High Efficiency Up to 94% at 200mA Output
Current
0.6V to 4.5V Operating Voltage
1V Start Up Input Voltage
Low Battery Voltage Detection
Reverse Voltage Protection
Internal Synchronous Rectifier
Automatic Detection Input Voltage
Compact SOP-8-P and TSSOP-8 Packages
Lead Free Available (RoHS Compliant)
Applications
•
•
•
•
•
Dual Mode Power System
USB Peripheral
Camcorders and Digital Camera
Hand-held Instrument
PDAs
Pin Description
TSSOP-8 Top View
VIN
FB
SHDN
LBI
SOP-8-P Top View
VIN
FB
SHDN
LBI
1
2
3
4
8
7
6
5
OUT
LX
GND
LBO
1
2
3
4
8
7
6
5
OUT
LX
GND
LBO
= Thermal Pad
(connected to GND plane for better heat
dissipation)
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.6 - Feb., 2006
1
www.anpec.com.tw
APW7075
Ordering and Marking Information
APW7075
Lead Free Code
Handling Code
Temp. Range
Package Code
APW7075 KA :
APW7075 O :
APW7075
XXXXX
APW7075
XXXXX
Package Code
KA : SOP-8-P
O : TSSOP-8
Temp. Range
C : 0 to 70
°
C
I : -40
°
C to 85
°
C
Handling Code
TU : Tube
TR : Tape & Reel
Lead Free Code
L : Lead Free Device Blank : Original Device
XXXXX - Date Code
XXXXX - Date Code
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
VIN
SHDN
VDD
FB
Y
VDD
Current
Limit
Vref
VDD
P-MOS
VDD
Vref
Q2
P-MOS
A
B
C
phase
compensation
Y
Q1
VOUT A
GND B
R1,R2 C
OUT
VDD
PWM/
PFM
controller
Drive
Q3
Oscillator
N-MOS
voltage
reference
soft-start
Q4
Vref
2
SHDN
LX
FB
GND
LBI
LBO
N-MOS
Copyright
©
ANPEC Electronics Corp.
Rev. A.6 - Feb., 2006
2
www.anpec.com.tw
APW7075
Absolute Maximum Ratings
Symbol
V
OUT
V
IO
T
A
T
J
T
STG
T
S
Parameter
Supply voltage(OUT to GND)
Input / output pins
Operating Ambient Temperature Range
Junction Temperature Range
Storage Temperature Range
Soldering Temperature
Value
-0.3 to 6.0
-0.3 to 6.0
0 to 85
0 to 150
-65 to +150
300, 10 seconds
Unit
V
V
°C
°C
°C
°C
Thermal Characteristics
Symbol
R
θ
JA
Parameter
Thermal Resistance
−
Junction to Ambient
SOP-8
SOP-8-P
TSSOP-8
Value
124
80
160
Unit
°
C/W
Electrical Characteristics
V
BAT
= 2V, FB = OUT (V
OUT
= 3.3V), R
L
=
∞,
T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at
T
A
= +25°C.
Symbol
Parameter
Test Conditions
APW7075
Min.
Typ.
Max.
Unit
Step-up section
Minimum Operating Input
V
BAT
Voltage (Note1)
Operating Voltage
Start-up Voltage
F
SW
D
MAX
Operating Frequency
Maximum PWM Duty Cycle
R
L
= 3KΩ
V
OUT
= 3.3VX96%
V
OUT
= 3.3VX96%
I
LX
= 100mA
I
LX
= 100mA
0.6
0.6
0.9
300
90
0.3
0.6
0.6
0.9
4.5
1
V
V
V
kHz
%
Ω
Ω
Power MOSFET
R
DS(on)
-N Active Switch ON Resistance
Synchronous Switch on
R
DS(ON)
-P
Resistance
Control
Output Voltage
Output Voltage Range
FB = OUT, I
LOAD
= 0mA
FB = GND, I
LOAD
= 0mA
External divider
3.234
2.45
2.5
3.3
2.5
3.366
2.55
5.5
150
V
V
V
mV
V
OUT
V
OUT(drop)
V
OUT
Dropping Voltage (Note 2) V
OUT
= 3.3V, C
OUT
= 100µF
Copyright
©
ANPEC Electronics Corp.
Rev. A.6 - Feb., 2006
3
www.anpec.com.tw
APW7075
Electrical Characteristics (Cont.)
Unless otherwise noted these specifications apply over full temperature, 3.9V≤VIN<5.5V, C
OUT
≥10µF,
SHDN=V
IN
,Typical values are at T
A
=+25°C.)
Symbol
T
SS
V
REF
I
FB
I
DD
I
SHDN
SHDN
Parameter
Soft-start Time
FB Input Threshold
FB Input Current
Shutdown Current
SHDN Input Current
Logic LOW (V
IL
)
Logic HIGH(V
IH
)
LBI Input Hysteresis
LBI Threshold
LBI Input Current
LBO Logic Low
Test Conditions
V
OUT
= 3.3V
I
LOAD
= 0mA
V
FB
= 1.4V
V
SHDN
= 0
V
SHDN
= 0 or V
OUT
APW7075
Min.
Typ.
30
1.176
1.2
0.03
70
0.1
0.07
0.8
1.4
0.588
0.8
10
0.6
1
0.2
0.07
0.612
50
0.4
1
Max.
100
1.224
50
140
5
50
0.3
Unit
ms
V
nA
µA
µ
A
nA
V
V
mV
V
nA
V
µ
A
Operating Current (Note3) V
OUT
= 3.3VX96%, I
LOAD
= 0mA
V
LBI
I
LBI
V
LBO
I
LBO
V
LBI
= 0.8V
V
LBI
= 0, I
SINk
= 1mA
LBO Off Leakage Current V
LBO
= 5.5V, V
LBI
= 5.5V
Upper V
IN
Threshold
V
IN
increasing
Voltage
Lower V
IN
Threshold
V
IN
decreasing
Voltage
VIN Threshold Hysteresis
Output Voltage
Current Limit
Short Current
Load Current
Dropout Voltage
Quiescent Current
I
LOAD
= 500mA
No load
I
LOAD
= 500mA
4V<V
IN
<5.5V, I
LOAD
= 0mA
V
IN
= 5V, 0mA<I
LOAD
<500mA
V
IN
= 5V
V
OUT
= 0V
500
LDO Section
(Note4)
V
IN(upper)
V
IN(lower)
V
TH
V
OUT
I
LIM
I
SHORT
I
OUT
V
DROP
Iq
3.75
3.65
3.9
3.8
100
V
OUT
-2
V
OUT
1
110
0.6
800
1.1
4
20
0.9
1000
1.5
10
30
V
OUT
+2
4.05
3.95
V
V
mV
V
A
mA
mA
V
uA
mA
mV
mV
REG
LINE
Line Regulation
REG
LOAD
Load Regulation
Note1: The min. operating voltage is dependent on the duty cycle.
Note2: The dropped output voltage is that the input power (VIN pin) is switched to battery power (LX pin),
when the VIN power is removed.
Note3: Device is boostrapped ( power to the IC comes from OUT). This correlates directly with the actual
battery supply.
Note4: If the LDO mode is used, the output voltage should be under 3.8V.
Copyright
©
ANPEC Electronics Corp.
Rev. A.6 - Feb., 2006
4
www.anpec.com.tw
APW7075
Pin Function Description
VIN (Pin 1)
Input supply voltage for dual-mode application. Con-
nect a schokkty diode (current rating >500mA) to USB
port or 5V adapter. If the LDO mode is not used, tie
the VIN pin to ground.
FB (pin 2)
Internal 1.2V reference voltage. Connect to OUT for 3.
3V output,. Connect to GND for 2.5V output. Use a
resistor divider to set the output voltage from 2.5V to
5.5V.
SHDN (pin 3)
Shutdown input. High = operating mode; Low = shut-
down mode.
LBI (Pin 4)
Low-battery comparator input. Internally set to trip at
0.6V.
LBO (pin 5)
Open-drain low battery comparator output. Connect
LBO to OUT through a 100K
Ω
resistor. Output is low
as V
LBI
< 0.6V. Open-drain device is turned on during
shutdown.
OUT (pin 8)
Power output. OUT provides bootstrap power to the
IC.
GND (Pin 6)
Ground pins of the circuitry and all ground pins must
be soldered to PCB with proper power dissipation.
LX (pin 7)
N-channel and P-channel power MOSFET drain
connection.
Application Schematic
VBAT
C1
10uF
L1
22UH
1N5817
Adapter
C3
5V
10uF
R6
VOUT 3.3V
1
2
8
OUT
7
FB
3
SHDN
GND
5
LBI
LBO
100k
Ω
R5
C4
1uF
C2
100uF
VIN
ON
LX
6
OFF
R3
4
APW7075
R4
Low Battery Output
Connect the R6=500Ω to 1kΩ to GND
Figure 1. Dual Model : 3.3V Output Voltage
Copyright
©
ANPEC Electronics Corp.
Rev. A.6 - Feb., 2006
5
www.anpec.com.tw
