Caution 1) Absolute maximum ratings represent the value which cannot be exceeded for any length of time.
Caution 2) Even when the device is used within the range of absolute maximum ratings, as a result of continuous usage under high temperature, high current,
high voltage, or drastic temperature change, the reliability of the IC may be degraded. Please contact us for the further details.
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed,
damage may occur and reliability may be affected.
ORDERING INFORMATION
See detailed ordering and shipping information on page 17 of this data sheet.
Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond the Recommended
Operating Ranges limits may affect device reliability.
Electrical Characteristics
at Ta
½
25C, VIN = 12V
Parameter
Reference voltage block
Internal reference voltage
5V power supply
Triangular waveform oscillator block
Oscillation frequency
Frequency variation
Oscillation frequency fold back
detection voltage
Oscillation frequency after fold back
ON/OFF circuit block
IC start-up voltage
IC off voltage
Soft start circuit block
Soft start source current
Soft start sink current
UVLO circuit block
UVLO lock release voltage
UVLO hysteresis
Error amplifier
Input bias current
Error amplifier gain
Sink output current
Source output current
Current detection amplifier gain
over current limiter circuit block
Reference current
Over current detection comparator
offset voltage
Over current detection comparator
common mode input range
PWM comparator
Input threshold voltage
(FOSC=125kHz)
Maximum ON duty
Output block
Output stage ON resistance
(the upper side)
Output stage ON resistance
(the lower side)
Output stage ON current
(the upper side)
Output stage ON current
(the lower side)
Continued on next page
IONL
240
mA
IONH
240
mA
RONL
5
RONH
5
Vt max
Vt0
DMAX
Duty cycle = DMAX
Duty cycle = 0%
0.9
0.4
86
1.0
0.5
90
1.1
0.6
95
V
V
%
VIN-0.45
VIN
V
ILIM1
VLIM OFS
-10%
-5
18.5
+10%
+5
A
mV
IEA IN
GEA
IEA OSK
IEA OSC
GISNS
FB = 1.0V
FB = 0V
1000
1400
-100
100
1.5
100
1800
nA
A/V
A
A
VUVLO
VUVLO H
8
0.7
V
V
ISS SC
ISS SK
EN
3.5V
EN
1V, VDD = 5V
4
5
2
6
A
mA
VEN on
VEN off
2.5
1.0
3.0
1.2
3.5
1.4
V
V
FOSC FB
1/3FOSC
kHz
FOSC
FOSC DV
VOSC FB
RT=220kΩ
VIN = 8.5 to 42V
FB voltage detection after SS ends
110
125
1
0.1
140
kHz
%
V
Vref
VDD
Including offset of E/A
IOUT = 0 to 5mA
0.654
4.7
0.67
5.2
0.686
5.7
V
V
Symbol
Conditions
Ratings
min
typ
max
Unit
No.A2093-2/2
LV5768V-A
Continued from preceding page.
Parameter
The whole device
Standby current
Mean consumption current
Security function
Protection function operating
temperature at high temperature
Protection function hysteresis at high
temperature
TSD hys
* Design certification
30
C
TSD on
* Design certification
170
C
ICCS
ICCA
EN
1V
EN
3.5V
3
10
A
mA
Symbol
Conditions
Ratings
min
typ
max
Unit
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product performance may not be
indicated by the Electrical Characteristics if operated under different conditions.
Package Dimensions
unit : mm
SSOP16 (225mil)
CASE 565AM
ISSUE A
SOLDERING FOOTPRINT*
5.80
1.0
(Unit: mm)
0.32
GENERIC
MARKING DIAGRAM*
XXXXXXXXXX
YMDDD
0.65
XXXXX = Specific Device Code
Y = Year
M = Month
DDD = Additional Traceability Data
*This information is generic. Please refer to
device data sheet for actual part marking.
NOTE: The measurements are not to guarantee but for reference only.
*For additional information on our Pb−Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
No.A2093-3/3
LV5768V-A
Pd max -- Ta
Specified board : 114.3
×
76.1
×
1.6mm
3
glass epoxy board.
1.0
Allowable power dissipation, Pd max -- W
0.8
0.74
0.6
0.4
0.38
0.2
0
--40
--20
0
20
40
60
8085
100
Ambient temperature,
Ta -- C
Pin Assignment
FB 1
COMP 2
EN 3
RT 4
NC 5
SW 6
CBOOT 7
HDRV 8
Top view
16 SS
15 ILIM
14 VIN
13 NC
LV5768V
12 SUBGND
11 GND
10 VDD
9 LDRV
No.A2093-4/4
LV5768V-A
Block Diagram
VIN 14
5V
REGULATOR
5V
REFERENCE
VOLTAGE
VDD UVLO
TSD
VIN UVLO
ILIM 15
18.5uA
-
+
OCP Comp
S Q
R
VIN
+
-
Current
Amp
SAW WAVE
OSCILLATOR
fosc forcec
1/3
7 CBOOT
8 HDRV
DMAX = 90%
1.0V
0.5V
6 SW
-
+
PWM Comp
CONTROL
Logic
5V
10 VDD
9 LDRV
11 GND
1.1V
SD
+
-
SD
S Q
R
SS 16
FB 1
COMP 2
0.67V
+
+
-
+
-
SS Amp
Err
Amp
0.1V
shut down(SD)
0.1V
1.2V
RT 4
+
-
+
-
12 SUBGND
FFOLD
Comp
3
EN
Pin Function
Pin No.
1
Pin name
FB
Description
Error amplifier reverse input pin. By operating the converter, the voltage of this pin becomes 0.67V.
The voltage in which the output voltage is divided by an external resistance is applied to this pin. Moreover, when this pin
voltage becomes 0.1V or less after a soft start ends, the
oscillatory frequency becomes 1/3.
2
3
4
5
6
7
8
9
10
11
12
13
14
15
COMP
EN
RT
N.C.
SW
CBOOT
HDRV
LDRV
VDD
GND
SUBGND
N.C.
VIN
ILIM
Error amplifier output pin. Connect a phase compensation circuit between this pin and GND.
ON/OFF pin.
Oscillation frequency setting pin. Resistance is connected with this pin between GND.
No connection *2
Pin to connect with switching node. A source of external Upper NchMOSFET is connected with a drain of external lower
NchMOSFET.
Bootstrap capacitor connection pin. This pin becomes a GATE drive power supply of an external NchMOSFET.
Connect a bypath capacitor between CBOOT and SW.
An external upper MOSFET gate drive pin.
An external lower MOSFET gate drive pin.
Power supply pin for an external the lower MOS-FET gate drive.
Ground pin. Each reference voltage is based on the voltage of the ground pin.
It is connected with the GND pin of 11pin inside
.
*3
No connection *2
Power supply pin. This pin is monitored by UVLO function. When the voltage of this pin becomes 8V or more, the IC starts by
UVLO function and the soft start function operates.
Reference current pin for current detection. The sink current of about 18.5μA flows to this pin.
When a resistance is connected between this pin and VIN outside and the voltage applied to the SW pin is lower than the
voltage of the terminal side of the resistance, the upper NchMOSFET is off by operating the current limiter comparator.
This operation is reset with respect to each PWM pulse.
16
SS
Pin to connect a capacitor for soft start. A capacitor for soft start is charged by using the current of about 5μA.
When this pin voltage becomes about 1.1V, the soft start period is expired. And the frequency fold back function becomes
active.
*2 The problem does not occur even if connected to the GND.
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