LV5068V.pdf 데이터시트 (총 6 페이지) - 파일 다운로드 LV5068V 데이타시트 다운로드

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Ordering number : ENA1875
LV5068V
Bi-CMOS IC
Low power consumption and
high efficiency Step-down
Switching Regulator
Controller
http://onsemi.com
Overview
LV5068V is 1ch step-down switching regulator. The operation current is about 80μA, and low power consumption is
achieved.
Functions
1ch SBD rectification controller IC
Maximum value of light load mode current is 80μA.
Built-in OCP circuit with P-by-P method
When P-by-P is generated continuously, it shifts to the HICCUP operation.
If connect C-HICCUP to GND pin, then latch-off when over current.
The oscillatory frequency can be set by the external pin. The oscillatory frequency is 300 kHz to 2.2MHz
Built-in UVLO, TSD
Synchronous driving with external signal
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Symbol
Conditions
Input voltage
Allowable pin voltage
VIN max
PDR,HDRV,RSNS,
ILIM,EN,PG
VIN-PDR
REF
SS,FB,COMP,RT
C-HICCUP,SYNC
Allowable power dissipation
Pd max
Specified substrate *1
Operating temperature
Topr
Storage temperature
Tstg
*1: Specified substrate 114.3mm×76.1mm×1.6mm3 glass-epoxy
Ratings
45
VIN
6
6
REF
Unit
V
V
V
V
V
0.74
-40 to +85
-55 to +150
W
˚C
˚C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating
Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
Semiconductor Components Industries, LLC, 2013
August, 2013
N1010 SY 20101102-S00002 No.A1875-1/6

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LV5068V
Recommended Operating Conditions at Ta = 25°C
Parameter
Input voltage range
Symbol
VIN
Conditions
Electrical Characteristics at Ta = 25°C, VIN = 15V
Parameter
Symbol
Conditions
Reference voltage
Internal reference voltage
Pch drive voltage
Saw wave oscillator
Oscillatory frequency
ON/OFF circuit
IC start-up voltage
Disable voltage
Soft start circuit
Soft start source current
Soft start sink current
UVLO circuit
UVLO release voltage
UVLO lock voltage
Error amplifier
Input bias current
Error amplifier gain
Output sink current
Output source current
Over current limit circuit
Reference current
Over current detection
comparator offset voltage
RSNS pin input range
HICCUP timer start-up cycle
HICCUP comparator threshold
voltage
HICCUP timer change current
PWM comparator
Maximum On-duty
Logic output
Power good “L” sink current
Power good “H” leakage current
Power good threshold voltage
Power good hysteresis
Output
Output on-resistance (High)
Output on-resistance (Low)
Output on-current (High)
Output on-current (Low)
The entire device
Stand-by current
Light load mode consumption
current
Thermal shutdown
*2: Design certification
Vref
VPDR
FOSC
VCNT_ON
VCNT_OFF
ISS_SC
ISS_SK
VUVLON
VUVLOF
IEA_IN
GEA
IEA_OSK
IES_OSC
ILIM1
VLIM_OFS
VRSNS
NLCYCLES
VtHIC
IHIC
D max
IPWRGD_L
IPWRGD_H
VtPG
VPG_H
RONH
RONL
IONH
IONL
ICCS
ISLEEP1
TSD
IOUT=0 to -5mA
RT=470kΩ
EN>1.5V
EN<0.3V, SS=4V
FB=COMP
FB=COMP
FB=1.75V
FB=0.75V
PG=5V
PG=5V
EN<0.3V
EN>1.5V,
No switching
*2
Ratings
4.5 to 40
Unit
V
Ratings
min typ
Unit
max
1.241
VIN-5.5
1.260
VIN-5.0
1.279
VIN-4.5
V
V
280 330 380 kHz
1.5 VIN V
0 0.3 V
1.3 2.0 2.7 μA
1.0 1.6 2.2 mA
3.3 3.7 4.1 V
2.5 2.9 3.3 V
-100
-50 100 nA
100 250 400 μA/V
-40 -20 -10 μA
10 20 40 μA
48.4
-5
VIN-0.175
1.2
1
55
15
1.26
2
61.6
+5
μA
mV
VIN
1.32
V
cycle
V
3 μA
95 %
4 5 6 mA
0 1 μA
1.0 1.1 1.2 V
40 50 60 mV
3
3
500
500
Ω
Ω
mA
mA
0 1 μA
30 55 80 μA
150 170 190 ˚C
No.A1875-2/6

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Package Dimensions
unit : mm (typ)
3178B
5.2
16
9
LV5068V
1.2
0.8
0.74
Pd max -- Ta
Specified circuit board :
114.3×76.1×1.6mm3
glass epoxy board
1
(0.33)
0.65
8
0.22
0.15
SANYO : SSOP16(225mil)
0.4 0.38
0
-40 -20 0 20 40 60 80 100 120
Ambient temperature, Ta - C
Block Diagram
VIN 2.EN
Hi:ON
Lo:OFF
11.C-HICCUP
C8
14.COMP
FB 15.FB
R6
C6 12.SS
C7
1.PG
13.NC
Wake-up
Band-gap
Bias
1.26V
+
-
uvlo.comp
TSD
-HIC CUP.comp
+
enable
REF
Pch
Drive
+
-
pwm.comp
15pluse
+
-
counter
-
++ PbyP.comp
err.amp
+
-
VIN
PG.comp
enable
1.1V
+
-
SQ
RQ
slope
clk
OSC
Level-shift
PDR
R3
16.REF
C5
7.PDR
C3
4.VIN
VIN
R1 R2
C1 C10
5.RSNS
3.ILIM
6.HDRV
Q1
L
D1
C9 R4
FB
9. SYNC 10.RT 8.GND
R8 R7
C2 R5
No.A1875-3/6

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Pin Assignment
LV5068V
PG 1
EN 2
ILIM 3
VIN 4
RSNS 5
HDRV 6
PDR 7
GND 8
TOP VIEW
LV5068V
16 REF
15 FB
14 COMP
13 N.C.
12 SS
11 C-HICCUP
10 RT
9 SYNC
Pin Descriptions
Pin
Pin name
No.
1 PG
Descriptions
Power good pin.
Connect to open drain of MOS-FET in ICs inside.
Setting output voltage to "L", when FB voltage is 1.05V or less
2 EN
ON/OFF pin
3 ILIM
4 VIN
5 RSNS
For current detection.
Sink current is about 55μA. The current limiter comparator
works when an external resistor is connected between this pin
and VIN, and if the voltage of this resistor is less than the
voltage of RSNS then Pch MOS is turned off. This operation is
reset each PWM pulse.
Supply voltage pin.
It is observed by the UVLO function. When its voltage becomes
3.7V or more, ICs startup in soft start.
Current detection resistor connection pin.
Resistor is connected between VIN and this pin, and the current
flows to MOSFET are measured.
Equivalent circuit
PG
GND
VIN
EN
GND
VIN
ILIM
GND
VIN
GND
VIN
RSNS
GND
Continued on next page.
No.A1875-4/6

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LV5068V
Continued from preceding page.
Pin
Pin name
No.
6 HDRV
Descriptions
The external high-side MOSFET gate drive pin.
7 PDR
Gate drive voltage of the external Pch MOSFET.
Meanwhile, the bypass capacitor is connected between VIN
and this pin.
8 GND
Ground Pin.
Ground pin voltage is reference voltage.
9 SYNC
Pin of using combined of external synchronous signal input pin
10 RT
Oscillation frequency setting pin.
Resistor is connected between this pin and GND.
11 C-HICCUP
It is capacitor connection pin for setting re-startup cycle in
HICCUP mode.
If connect it to GND pin, then latch-off when over current.
12 SS
Capacitor connection pin for soft start.
About 2μA current charges the soft start capacitor.
13 NC
NC pin.
Equivalent circuit
VIN
HDRV
PDR
VIN
VIN
GND
VIN
PDR
GND
SYNC
GND
VIN
RT
GND
VIN
C-HICCUP
GND
VIN
SS
GND
Continued on next page.
No.A1875-5/6