specifically designed to be incorporated for step-up
and voltage inverting functions with a minimum
number of external components.
The AP1627 has a built-in 1.23V reference voltage;
a negative voltage can be set with the external
components. The soft-start time can be set with a
external capacitance.
The AP1627 are available in space-saving 8-pin
MSOP package. An evaluation kit is available to
expedite designs.
Applications
- Cell Phone
- Digital Cameras
- OLED Display Bios Voltage
Pin Assignments
Pin Descriptions
Name
V
CC
FB
REF
Comp
SS
CE
GND
EXT
Pin
1
2
3
4
5
6
7
8
Description
Power Input pin
Feedback Pin
1.23 Reference Voltage
Compensation Pin
Soft-Start Pin
Enable Channel
Signal Ground
External P-MOSFET Connection
V
CC
FB
REF
Comp
1
2
3
4
MSOP-8L
8
7
6
5
EXT
GND
CE
SS
Ordering Information
AP 1627 X X
Package
M: MSOP-8L
Packing
Blank : Tube
A : Taping
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev. 1.0 Sep 22, 2005
1/5
AP1627
High-Efficiency Inverting Controller
Block Diagram
V
CC
REF
REF
CE
CE
Soft
Start
SS
FB
+
-
PMW
Control
EXT
GND
Comp
Absolute Maximum Ratings
Symbol
V
CC
V
SS
V
COMP
V
FB
V
CE
V
EXT
I
EXT
P
D
T
OPR
T
J
T
STG
Parameter
VIN Pin Voltage
SS Pin Voltage
Comp Pin Voltage
FB Pin Voltage
CE Pin Voltage
EXT PIN Voltage
EXT PIN Current
Continuous Power Dissipation (T
A
= +40
o
C)
Operating Temperature Range
Junction Temperature
Storage Temperature Range
Rating
-0.3 ~ 6.5
-0.3 ~ V
CC
+0.3
-0.3 ~ V
CC
+0.3
-0.3 ~ V
CC
+0.3
-0.3 ~ V
CC
+0.3
-0.3 ~ V
CC
+0.3
+100
250
-25 to +85
+140
-40 to +125
Unit
V
V
V
V
V
V
mA
mW
o
C
o
C
o
C
o
Electrical Characteristics
AP1627
（V
IN
=3.3V, V
OUT
= -9V, Load=100mA）
Ta=25 C
Parameter
Input Voltage
Reference Voltage
Reference Drift
Quiescent Current
Stand-by Current
Oscillator Frequency
Maximum Duty Ratio
CE”High” Voltage
CE”Low” Voltage
Line Regulation
Load Regulation
Efficiency
Symbol
V
CC
V
REF
I
CCQ
I
STB
Fosc
MAXDTY
V
CEH
V
CEL
Conditions
T
A
=-25
o
C~85
o
C
No external components,
CE=V
IN
, V
FB
=-0.4V
No external components,
CE=0V, V
FB
=-0.4V
Apply above 0.65Vcc (min.) to CE,
Operating mode
Apply under 0.2Vcc (min.) to CE,
Standby mode
V
CC
=3V~6V
Load=0~400mA
Min.
2.5
1.205
-
-
-
300
-
0.65
-
-
-
-
Typ.
-
1.23
50
50
-
400
80
-
-
-
-
80
Max.
6
1.255
-
100
2
500
-
-
0.20
0.4
0.2
-
Units
V
V
ppm/
o
C
µA
µA
kHz
%
*Vcc
*Vcc
%
%
%
EFFI
Anachip Corp.
www.anachip.com.tw
2/5
Rev. 1.0
Sep 22, 2005
AP1627
High-Efficiency Inverting Controller
Typical Application Circuit
Q1
AF2301
L1
10uH
1
6
5
4
C5
10nF
8
VCC EXT
2
FB
CE
3
SS
Vref
Comp VSS 7
U1
D1
SS240
Vout
R3
100
C1
22uF
C2
0.1uF
C3
0.1uF
C4
10nF
R1
C10
33uF
C11
0.1uF
2.5~6V
VCC
R4
1M
R2
R5
1M
C6
39pF
AP1627
C7
0.1uF
Vout = Vref * (R1/R2)
Vref=1.23V
R2 suggest 50K~100K
Function Description
The AP1627 is an inverting controller that generates
a regulated negative output voltage, typically for
OLED display bias. This is useful in height-limited
designs where transformers may not be desired.
The MOSFET driver EXT in the AP1627 is designed
to drive P-channel MOSFETs.
Reference
The AP1627 has a precise 1.23V reference.
Connect a 0.1uF ceramic bypass capacitor from
REF to GND within 0.2in (5mm) of the REF pin.
REF can source up to 100µA and is enabled
whenever ON is high and V
CC
is above 2.5V. If the
100µA REF load limit must be exceeded, buffer
REF with an external op amp.
Shutdown
When CE voltage is lower than 0.2*Vcc, the internal
reference and biasing circuit totally turn off, the
output voltage drops to zero and the supply current
drops to 1uA.
Output Adjustable
The output voltage for the AP1627 is set by two
resistors, R1 and R2, which form a voltage divider
between the output, FB pin and REF pin, R2 can be
any value from 50KΩ to 100KΩ. R1 is given by the
following formula:
Vout
R1=
×R2
1.23
Soft-Start
A capacitor connects with SS to GND. It can cause
the start-up current to rise preventing output voltage
overshoot slowly and high inrush current. The
capacitor value directly effect start-up time.
Duty Cycle
The maximum duty cycle of the AP1627 is 80%.
The duty cycle for a given application inverting
topology is given by:
Duty cycle=
Vout
Vcc
+
Vout
Anachip Corp.
www.anachip.com.tw
3/5
Rev. 1.0
Sep 22, 2005
AP1627
High-Efficiency Inverting Controller
Applications Information
Designing a PC Board
Good PC board layout is important to achieve
optimal performance from the AP1627. Poor design
can cause excessive conducted and/or radiated
noise. Conductors carrying discontinuous currents
and any high-current path should be made as short
and wide as possible. A separate low-noise ground
plane containing the reference and signal grounds
should connect to the power-ground plane at only
one point to minimize the effects of power-ground
currents. Typically, the ground planes are best
joined right at the IC.
Keep the voltage-feedback network very close to
the IC, preferably within 0.2in (5mm) of the FB pin.
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