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XC9519 Series
Dual Output Step-Up/Inverting DC/DC Converter
■GENERAL DESCRIPTION
The XC9519 series is a 2 channel (step-up and inverting) DC/DC converter IC. One DC/DC converter is a step-up DC/DC and the other is an
inverting DC/DC converter. The step-up converter compares a built-in reference voltage 1.0V to the FBP voltage (accuracy ±1.5%) and a
positive output voltage can be set freely with the external components up to 18V. The inverting DC/DC converter compares a difference
between a reference voltage and the FBN voltage (accuracy ±1.5%) to the GND, then a negative output voltage can be set until -15V with the
external components.
With a 1.2MHz frequency, the size of the external components can be reduced. As for operation mode, the device can be selected to use PWM
control or automatic PWM/PFM switching control by the MODE pin. In the automatic PWM/PFM switching control mode, control switches from
PWM to PFM during light loads. The series is highly efficient from light loads through to large output currents. In the PWM control mode,
noise is easily reduced since the frequency is fixed. The control mode can be selected for each application. The soft start and current control
functions are internally optimized. During stand-by, all circuits in the IC are shutdown to reduce current consumption to as low as 1.0μA or
less. The device includes a gate control pin for the P-channel MOSFET which is used for a load disconnection at the stand-by mode. The
GAINP and GAINN pins are used for loop compensation in order to optimize load transient response. With the built-in UVLO (Under Voltage
Lock Out) function, the internal driver transistor is forced OFF when input voltage becomes 2.2V or lower.
■FEATURES
Input Voltage : 2.7V ~ 5.5V
Output Current
: 500mA @V
IN
=3.7V, V
OUTP
=5.0V, V
OUTN
=-5.0V
Positive Output Voltage :
4.0V
(*1)
~ 18.0V (accuracy ±1.5% @25
o
C)
Negative Output Voltage :
-15.0V
(*2)
~ -4.0V (accuracy ±1.5% @25
o
C)
Oscillation Frequency : 1.2MHz
Soft-Start Circuit Built-In : Step-up DC/DC converter 2.5ms (TYP.)
:
Inverting DC/DC converter 2.2ms (TYP.)
Protection Circuits : Over Current Limit (Integral Latching)
Short Protection Latching
UVLO
Thermal
Shutdown
Over Voltage Protection
Function Addition : Control Pin
Load disconnect Pin
Phase Compensation Pin
Ceramic Capacitor Compatible
Operating Ambient Temperature
: -40℃ ~ +85℃
Package : QF
N-24
Environmentally Friendly
: EU RoHS Compliant, Pb Free
（*1）V
OUTPSET
≧V
IN
+ 0.2V (V
OUTPSET
:Positive output voltage range)
（*2）V
IN
- V
OUTNSET
+ V
FN
≦21.0V
(V
FN
: Forward voltage of SBD
N
,
V
OUTNSET
: Nagative output voltage range)
■TYPICAL APPLICATION CIRCUIT
ETR0710-009
■TYPICAL PERFORMANCE
CHARACTERISTICS
ENP FBN
PGND
R
FBP1
L
P
V
IN
XC9519
FBP
LXP
ENN
BSW
VREF
LXN
PVIN
AVIN
AGND
SBD
P
C
IN_A
R
FBP2
L
N
R
FBN2
R
FBN1
C
LP
C
LN
SBD
N
V
OUTP
C
L_VR
GAINP
R
ZN
C
ZP
C
ZN
R
ZP
GAINN
VOUTP
C
IN_P
V
OUTN
MODE
VOUTN
SWP
P-ch MOS
C
FBP
R
SP
C
IN_SW
V
OUTP
=5.0V, V
OUTN
=-5.0V, I
OUTP
=I
OUTN
C
LP
, C
LN
=4×4.7μF, L
P
, L
N
=3.3μH (VLF5014S-3R3M2R0), SBD
P
, SBD
N
: CMS03
P-ch MOS: EMH1303, R
ZP
=7.5kΩ, C
ZP
=4.7nF, R
ZN
=130kΩ, C
ZN
=0.47nF
0
20
40
60
80
100
0.1 1 10 100 1000
Output Current:I
OUT P
, I
OUT N
(mA)
Efficiency:EFFI(%
)
3.6V
2.7V
V
IN
= 4.4V
V
ENP
="H", V
ENN
="H"
PWM/PFM (V
MODE
="H")
PWM (V
MODE
="L")
■APPLICATIONS
●AMOLED
-
Smartphones
-
Tablet PCs
- Automotive navigation systems
●CCD image sensors
-
Surveillance cameras
●e-paper
-e-Books
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XC9519 Series
■BLOCK DIAGRAM
* Diodes inside the circuit are an ESD protection diode and a parasitic diode.
■PRODUCT CLASSIFICATION
XC9519①②③④⑤⑥-⑦
DESIGNATOR
ITEM SYMBOL DESCRIPTION
①
UVLO Detect Voltage A
UVLO Detect Voltage 2.2V
UVLO Hysteresis width 0.2V
②③
Oscillation Frequency 12 1.2 MHz
④
Maximum Current Limit A 2.0A
⑤⑥-⑦
(*1)
Package (Order Unit) ZR-G QFN-24 (1,000/Reel)
(*2)
●Ordering Information
(*1)
The “-G” suffix denotes Halogen and Antimony free as well as being fully EU RoHS compliant.
(*2)
The XC9519 reels are shipped in a moisture-proof packing.
Internal ON/OFF Controller