XC9519 Datasheet, PDF (1/38 Pages) Torex Semiconductor – Dual Output Step-Up/Inverting DC/DC Converter

XC9519 Series
ETR0710-008
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.
■APPLICATIONS
●AMOLED
- Smartphones
- Tablet PCs
- Automotive navigation systems
●CCD image sensors
- Surveillance cameras
●e-paper
-e-Books
˙TYPICAL APPLICATION CIRCUIT
■FEATURES
Input Voltage
: 2.7V ~ 5.5V
Output Current
Positive Output Voltage
Negative Output Voltage
: 500mA @V_IN=3.7V, V_OUTP=5.0V, V_OUTN=-5.0V
: 4.0V ^(*1) ~ 18.0V (accuracy ±1.5% @25^oC)
: -15.0V ^(*2) ~ -4.0V (accuracy ±1.5% @25^oC)
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 : -40ˆ ~ +85ˆ
Package
: QFN-24
Environmentally Friendlyç ç
: EU RoHS Compliant, Pb Free
ʢ*1ʣV_OUTPSETʾV_IN + 0.2V (V_OUTPSET :Positive output voltage range)
ʢ*2ʣV_IN - V_OUTNSET+ V_FNʽ20V
(V_FN : Forward voltage of SBD_N, V_OUTNSET : Nagative output voltage range)
˙TYPICAL PERFORMANCE
CHARACTERISTICS
LP
P-ch MOS
BSW
PVIN
AVIN
ENP
VIN
CIN_SW CIN_P CIN_A ENN
AGND
PGND
SWP
SBDP
LXP
VOUTP
FBP
VREF
CFBP
RSP
VOUTP
RFBP1
CLP
RFBN2
CL_VR
RFBP2
XC9519
FBN
MODE
VOUTN
GAINP
LXN
GAINN
RZP
RZN
CZP
CZN
RFBN1
SBDN
CLN
LN
VOUTN
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
100
V_ENP="H",V_ENN="H"
80
60
V_IN= 4.4V
3.6V
2.7V
40
20
0
0.1
PWM/PFM (V_MODE="H")
PWM (V_MODE="L")
1
10
100
Output Current:I_OUTP, I_OUTN (mA)
1000
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