APW7078
Single Step-up DC/DC Controller
Features
•
•
•
•
•
•
•
•
•
2.5 to 5.5V Input Voltage Range
Adjustable Frequency: Maximum 1MHZ
Incorporates Soft-Start Function
Built-in Short-Circuit Detection Circuit (SCP)
Low Operating Current: Maximum to 1mA
Low Shutdown Current: Maximum to 1µA
Package: SOP-8, MSOP-8, TDFN2x2-8 and
TSSOP-8
Under-Voltage Lockout
Lead Free and Green Devices Available
(RoHS Compliant)
General Description
The APW7078 is a single PWM, step-up DC-DC control-
ler with low operating voltage application integrating soft-
start and short circuit detection function. The oscillator
switching frequency on chip can be operated by terminat-
ing OSC pin to connect capacitor and resistor for adjust-
able operating frequency. Soft-start is adjusted with the
external capacitor, which sets the input current ramp.
Besides, the external compensation FB pin will apply the
flexibility in the dynamic loop status, which allows using
small and low equivalent series resistance (ESR) ce-
ramic output capacitors.
Pin Configuration
Applications
•
•
•
•
LCD Display Power Source
Camcorders VCRs, MP3, and Digital Still Camera
Hand-held and Communication Instruments
PDAs
INV
SCP
VDD
CTL
1
2
3
4
8
7
6
FB
OSC
GND
OUT
APW7078
5
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.7 - Jul., 2011
1
www.anpec.com.tw
APW7078
Ordering and Marking Information
APW7078
Assembly Material
Handling Code
Temperature Range
Package Code
APW7078 K :
APW7078
XXXXX
W7078
XXX
XX
APW7078
XXXXX
7078
X
Package Code
K : SOP-8 X : MSOP-8 O : TSSOP-8 QB : TDFN2x2-8
Temperature Range
I : -40 to 85 C
Handling Code
TR : Tape & Reel
Assembly Material
L : Lead Free Device
G : Halogen and Lead Free Device
XXXXX - Date Code
XXXXX - Date Code
XXXXX - Date Code
X - Date Code
APW7078 X :
APW7078 O :
APW7078 QB :
●
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
DD
V
IO
T
A
T
J
T
STG
T
SDR
Supply Voltage
Input / Output Pins
Operating Ambient Temperature Range
Junction Temperature Range
Storage Temperature Range
Maximum Lead Soldering Temperature, 10 Seconds
Parameter
Rating
-0.3 to 7
-0.3 to 7
-40 to 85
-40 to 150
-65 to +150
260
Unit
V
V
°C
°C
°C
°C
Note1: Stresses beyond 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 rating conditions for extended periods may
affect device reliability
Recommended Operating Conditions
Rating
Symbol
V
DD
V
INV
Supply Voltage
Error Amplifier Invert Input Voltage
Parameter
Min.
2.5
-0.2
Typ.
-
-
Max.
5.5
1
V
V
Unit
Copyright
©
ANPEC Electronics Corp.
Rev. A.7 - Jul., 2011
2
www.anpec.com.tw
APW7078
Recommended Operating Conditions (Cont.)
Rating
Symbol
V
CTL
C
SCP
R
T
C
T
F
SW
Control Pin Input Voltage
SCP Pin Capacitor
Timing Resistance
Timing Capacitor
Oscillator Frequency
Parameter
Min.
-0.2
-
1.0
100
200
Typ.
-
0.1
3.3
-
600
Max.
V
DD
-
10
270
1000
V
µF
kΩ
pF
kHz
Unit
Electrical Characteristics
(T
A
= 25°C, V
DD
= 3.3V, unless otherwise specified)
Symbol
ENTIRE DEVICE
V
DD
I
DD
I
SD
D
MAX
Supply Voltage
Supply Current
Shutdown Current
Maximum Duty Cycle
V
DD
=2.5V to 5.5V
CTL pin open or VDD
R
T
=3.3K, C
T
=270pF
2.5
-
-
80
-
0.7
0.1
85
5.5
1
1
92
V
mA
µA
%
Parameter
Test Conditions
APW7078
Min.
Typ.
Max.
Unit
UNDER-VOLTAGE LOCKOUT PROTECTION
V
TH
V
R
VDD Startup Threshold Voltage
Hysteresis voltage
-
2.0
-
-
150
2.4
-
V
mV
SOFT-START
V
SS
I
CS
V
SS
I
CS
Voltage at Soft-Start Completion
Soft-Start Charge Current
Voltage at Soft-Start Completion
Soft-Start Charge Current
V
SCP
=0V
V
SCP
=0V
-
-
0.7
-0.7
0.7
-0.7
0.8
-1.0
0.8
-1.0
0.9
-1.5
0.9
-1.5
V
µA
V
µA
V
µA
kHz
%
%
SHORT CIRCUIT PROTECTION (SCP)
V
SCP
I
SCP
Threshold Voltage
Charge Current
V
SCP
=0V
0.7
-0.7
0.8
-1.0
0.9
-1.5
SAWTOOTH WAVEFORM OSCILLATOR (OSC)
F
OSC
F
DV
F
DT
Oscillator Frequency
Frequency Stability for Voltage
Frequency Stability for
Temperature
R
T
=3.3kΩ, C
T
=270pF
V
DD
=2.5V to 5.5V
T
A
=-40°C to 85°C
500
-
-
600
2
5
700
5
-
Copyright
©
ANPEC Electronics Corp.
Rev. A.7 - Jul., 2011
3
www.anpec.com.tw
APW7078
Electrical Characteristics (Cont.)
(T
A
= 25°C, V
DD
= 3.3V, unless otherwise specified)
APW7078
Symbol
ERROR AMPLIFIER
V
REF
Reference Voltage
V
REF
Stability
V
REF
Variation with Temperature
gm
I
B
V
OH
Output Voltage Range
V
OL
Output Source Current
Output Sink Current
PWM CONTROLLER DRIVER
I
SOURCE
I
SINK
Output Source Current
Output Sink Current
Duty<5%, OUT=0V
Duty>5%, OUT=5V
-150
150
-200
200
-
-
mA
mA
INV=0V,FB=0.5V
INV=1V,FB=0.5V
-
-
-150
140
-
-180
170
0.01
-210
200
V
µA
µA
Transconductance
Input Bias Current
INV=0V
-
V
FB
=INV
V
DD
=2.5V to 5.5V
T
A
=-40°C to 85°C
0.493
-
-
1000
-
1.6
0.5
5
1
1300
-
1.8
0.508
20
-
1600
1
-
V
mV
%
µA/V
µA
V
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
CONTROL BLOCK
V
IL
Control Voltage
V
IH
Switch-off mode
0.8V
DD
-
-
Active mode
-
-
0.2V
DD
Copyright
©
ANPEC Electronics Corp.
Rev. A.7 - Jul., 2011
4
www.anpec.com.tw
APW7078
Pin Description
PIN NO.
1
2
3
4
5
6
7
8
Exposde
Pad
SYMBOL
INV
SCP
VDD
CTL
OUT
GND
OSC
FB
GND
I/O
I
-
-
I
O
-
-
O
-
FUNCTION
Internal 0.5V reference voltage. Use a resistor divider to set the output voltage.
Soft-start and short-circuit detection, connects a capacitor from the pin to ground.
Power supply input pin for IC voltage.
Output control pin. Low = operating mode; High = shutdown mode.
External MOSFET driving pin.
Ground pins of the IC.
Setting capacitor and resister to provide oscillation switching frequency adjustment.
Error amplifier output pin. Setting circuit for IC compensation.
Connect this pad to GND (pin6).
Block Diagram
VDD
OSC
UVLO
0.9 V
0.16 V
0.1 V
Sawtooth wave
oscillator
V
DD
-
+
+
+
DTC 0.8V
PWM
Comp.
V
DD
INV
-
+
V
REF
0.5V
FB
Error Amp.
Output drive
circuit
OUT
Soft-start
SCP
GND
SCP
CTL
Copyright
©
ANPEC Electronics Corp.
Rev. A.7 - Jul., 2011
5
www.anpec.com.tw
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