ENA1875 D

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
Input voltage
VIN max
Allowable pin voltage
PDR,HDRV,RSNS,
Conditions
Ratings
Unit
45
V
VIN
V
ILIM,EN,PG
VIN-PDR
6
V
REF
6
V
REF
V
SS,FB,COMP,RT
C-HICCUP,SYNC
Allowable power dissipation
Pd max
Operating temperature
Topr
Storage temperature
Tstg
Specified substrate *1
0.74
W
-40 to +85
˚C
-55 to +150
˚C
3
*1: Specified substrate 114.3mm×76.1mm×1.6mm glass-epoxy
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
LV5068V
Recommended Operating Conditions at Ta = 25°C
Parameter
Input voltage range
Symbol
Conditions
Ratings
VIN
Unit
4.5 to 40
V
Electrical Characteristics at Ta = 25°C, VIN = 15V
Parameter
Symbol
Ratings
Conditions
min
Unit
typ
max
Reference voltage
Internal reference voltage
Vref
Pch drive voltage
VPDR
IOUT=0 to -5mA
FOSC
RT=470kΩ
1.241
1.260
1.279
V
VIN-5.5
VIN-5.0
VIN-4.5
V
280
330
380
kHz
1.5
VIN
V
0
0.3
V
Saw wave oscillator
Oscillatory frequency
ON/OFF circuit
IC start-up voltage
VCNT_ON
Disable voltage
VCNT_OFF
Soft start circuit
Soft start source current
ISS_SC
EN>1.5V
1.3
2.0
2.7
μA
Soft start sink current
ISS_SK
EN<0.3V, SS=4V
1.0
1.6
2.2
mA
UVLO release voltage
VUVLON
FB=COMP
3.3
3.7
4.1
V
UVLO lock voltage
VUVLOF
FB=COMP
2.5
2.9
3.3
V
-100
-50
100
nA
100
250
400
μA/V
UVLO circuit
Error amplifier
Input bias current
IEA_IN
Error amplifier gain
GEA
Output sink current
IEA_OSK
FB=1.75V
-40
-20
-10
μA
Output source current
IES_OSC
FB=0.75V
10
20
40
μA
48.4
55
61.6
μA
+5
mV
Over current limit circuit
Reference current
ILIM1
Over current detection
VLIM_OFS
-5
comparator offset voltage
RSNS pin input range
VRSNS
HICCUP timer start-up cycle
NLCYCLES
HICCUP comparator threshold
VtHIC
VIN-0.175
VIN
15
V
cycle
1.2
1.26
1.32
V
1
2
3
μA
voltage
HICCUP timer change current
IHIC
PWM comparator
Maximum On-duty
D max
95
%
Logic output
Power good “L” sink current
IPWRGD_L
PG=5V
4
Power good “H” leakage current
IPWRGD_H
PG=5V
0
Power good threshold voltage
VtPG
1.0
Power good hysteresis
VPG_H
40
5
6
mA
1
μA
1.1
1.2
V
50
60
mV
Output
Output on-resistance (High)
RONH
3
Ω
Output on-resistance (Low)
RONL
3
Ω
Output on-current (High)
IONH
500
mA
Output on-current (Low)
IONL
500
mA
The entire device
Stand-by current
ICCS
EN<0.3V
0
1
μA
Light load mode consumption
ISLEEP1
EN>1.5V,
30
55
80
μA
150
170
190
˚C
current
Thermal shutdown
No switching
TSD
*2
*2: Design certification
No.A1875-2/6
LV5068V
Package Dimensions
unit : mm (typ)
3178B
Pd max -- Ta
1.2
5.2
1
8
0.65
0.15
(0.33)
Specified circuit board :
114.3×76.1×1.6mm3
glass epoxy board
Allowable power dissipation, Pd max - W
0.5
6.4
9
4.4
16
0.4
0.38
0
-40
-20
0
(1.3)
1.5max
0.22
0.8
0.74
20
40
60
100
80
120
0.1
Ambient temperature, Ta - C
SANYO : SSOP16(225mil)
Block Diagram
VIN
2.EN
Hi:ON
Lo:OFF
R3
Wake-up
Band-gap
16.REF
REF
+
uvlo.comp
enable
TSD
C5
7.PDR
Pch
Drive
C3
VIN
4.VIN
Bias
R1
1.26V
R2
HIC CUP.comp
11.C-HICCUP
C1
+
C8
+
-
C10
5.RSNS
pwm.comp
14.COMP
FB
15pluse
counter
+
+
15.FB
R6
3.ILIM
+
PbyP.comp
err.amp
+
12.SS
VIN
-
C7
enable
1.PG
13.NC
PG.comp
+
-
C6
slope
+
-
S
Q
R
Q
6.HDRV
Level-shift
clk
Q1
L
PDR
OSC
C9
R4
D1
1.1V
FB
9. SYNC
R8
10.RT
R7
8.GND
C2
R5
No.A1875-3/6
LV5068V
Pin Assignment
TOP VIEW
PG 1
16 REF
EN 2
15 FB
ILIM 3
14 COMP
VIN 4
RSNS 5
13 N.C.
LV5068V
HDRV 6
12 SS
11 C-HICCUP
PDR 7
10 RT
GND 8
9 SYNC
Pin Descriptions
Pin
No.
1
Pin name
PG
Descriptions
Power good pin.
Connect to open drain of MOS-FET in ICs inside.
Equivalent circuit
PG
Setting output voltage to "L", when FB voltage is 1.05V or less
GND
2
EN
ON/OFF pin
VIN
EN
GND
3
ILIM
For current detection.
Sink current is about 55μA. The current limiter comparator
VIN
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
ILIM
reset each PWM pulse.
GND
4
VIN
Supply voltage pin.
VIN
It is observed by the UVLO function. When its voltage becomes
3.7V or more, ICs startup in soft start.
GND
5
RSNS
Current detection resistor connection pin.
Resistor is connected between VIN and this pin, and the current
VIN
flows to MOSFET are measured.
RSNS
GND
Continued on next page.
No.A1875-4/6
LV5068V
Continued from preceding page.
Pin
No.
6
Pin name
HDRV
Descriptions
Equivalent circuit
The external high-side MOSFET gate drive pin.
VIN
HDRV
PDR
7
PDR
Gate drive voltage of the external Pch MOSFET.
VIN
Meanwhile, the bypass capacitor is connected between VIN
and this pin.
PDR
GND
8
GND
Ground Pin.
VIN
Ground pin voltage is reference voltage.
GND
9
SYNC
Pin of using combined of external synchronous signal input pin
VIN
SYNC
GND
10
RT
Oscillation frequency setting pin.
Resistor is connected between this pin and GND.
VIN
RT
GND
11
C-HICCUP
It is capacitor connection pin for setting re-startup cycle in
HICCUP mode.
VIN
If connect it to GND pin, then latch-off when over current.
C-HICCUP
GND
12
SS
Capacitor connection pin for soft start.
About 2μA current charges the soft start capacitor.
VIN
SS
GND
13
NC
NC pin.
Continued on next page.
No.A1875-5/6
LV5068V
Continued from preceding page.
Pin
No.
14
Pin name
COMP
Descriptions
Equivalent circuit
Error Amplifier Output Pin.
The phase compensation network is connected between GND
VIN
pin and COMP pin.
Thanks to current-mode control, COMP pin voltage would tell
you the output current amplitude. COMP pin is connected
internally to an int.comparator which comparators with 0.9V
COMP
reference. If COMP pin voltage is larger than.
0.9V, IC operates in “continuous mode”. If COMP pin voltage is
smaller than 0.9V, IC operates in “discontinuous mode (low
GND
consumption mode)”.
15
FB
Error amplifier reverse input pin.
ICs make its voltage keep 1.26V. Output voltage is divided by
VIN
external resistors and it across FB.
FB
GND
16
REF
Reference voltage.
VIN
REF
GND
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PS No.A1875-6/6
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