1-channel Step-down Switching Regulator

Ordering number : ENA1920A
LV5769V
Bi-CMOS IC
1-channel Step-down
Switching Regulator
http://onsemi.com
Overview
The LV5769V is a 1-channel step-down switching regulator.
Function
• 1 channel step-down switching regulator controller.
• Frequency decrease function at pendent.
• Load-independent soft start circuit.
• ON/OFF function.
• Built-in pulse-by-pulse OCP circuit. It is detected by
using ON resistance of an external MOS.
• Synchronous rectification
• Current mode control
SSOP16(225mil)
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Allowable pin voltage
Supply voltage
Symbol
Conditions
VIN max
Ratings
Unit
45
V
VIN, SW
45
V
HDRV, CBOOT
52
V
LDRV
6.0
V
Between CBOOT to SW
6.0
V
Between CBOOT to HDRV
EN, ILIM
Between VIN to ILIM
VDD
SS, FB, COMP,RT
Mounted on a specified board. *
VIN+0.3
V
1.0
V
6.0
V
VDD+0.3
V
Allowable Power dissipation
Pd max
0.74
W
Operating temperature
Topr
-40 to +85
°C
Storage temperature
Tstg
-55 to +150
°C
* Specified board : 114.3mm × 76.1mm × 1.6mm, glass epoxy board.
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 9 of this data sheet.
Semiconductor Components Industries, LLC, 2014
March, 2014
30614NK/20911SY 20110121-S00005,S00006 No.A1920-1/9
LV5769V
Recommended Operating Conditions at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
Supply voltage range
VIN
8.5 to 42
V
Error amplifier input voltage
VFB
0 to 1.6
V
Oscillatory frequency
FOSC
80 to 500
kHz
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 = 25°C, VCC = 12V
Parameter
Symbol
Conditions
Ratings
min
typ
Unit
max
Reference voltage block
Internal reference voltage
Vref
Including offset of E/A
0.654
0.67
0.686
V
5V power supply
VDD
IOUT = 0 to 5mA
4.7
5.2
5.7
V
110
125
140
kHz
Triangular waveform oscillator block
Oscillation frequency
FOSC
RT=220kΩ
Frequency variation
FOSC DV
VIN = 8.5 to 32V
Oscillation frequency fold back
VOSC FB
FB voltage detection after SS ends
1
%
0.1
V
detection voltage
Oscillation frequency after fold
FOSC FB
1/3FOSC
kHz
back
ON/OFF circuit block
IC start-up voltage
VEN on
2.5
3.0
3.5
V
IC off voltage
VEN off
1.1
1.3
1.5
V
4
5
6
Soft start circuit block
Soft start source current
ISS SC
EN > 3.5V
Soft start sink current
ISS SK
EN < 1V, VDD = 5V
2
μA
mA
UVLO circuit block
UVLO lock release voltage
VUVLO
UVLO hysteresis
VUVLO H
8
V
0.7
V
Error amplifier
Input bias current
IEA IN
Error amplifier gain
GEA
1000
Sink output current
IEA OSK
FB = 1.0V
Source output current
IEA OSC
FB = 0V
Current detection amplifier gain
GISNS
1400
100
nA
1800
μA/V
-100
μA
100
μA
1.5
over current limiter circuit block
Reference current
ILIM
Over current detection
VLIM OFS
+10%
μA
-5
+5
mV
VIN-0.45
VIN
V
-10%
18.5
comparator offset voltage
Over current detection
comparator common mode
input range
PWM comparator
Input threshold voltage
Vt max
Duty cycle = DMAX
0.9
1.0
1.1
V
(FOSC=125kHz)
Vt0
Duty cycle = 0%
0.4
0.5
0.6
V
Maximum ON duty
DMAX
86
90
95
%
Output block
Output stage ON resistance
RONH
5
Ω
RONL
5
Ω
(the upper side)
Output stage ON resistance
(the under side)
Output stage ON current
IONH
240
mA
IONL
240
mA
(the upper side)
Output stage ON current
(the under side)
Continued on next page.
No.A1920-2/9
LV5769V
Continued from preceding page.
Parameter
Symbol
Ratings
Conditions
min
typ
Unit
max
The whole device
Standby current
ICCS
EN < 1V
Mean consumption current
ICCA
EN > 3.5V
TSD on
TSD hys
10
μA
3
mA
* Design certification
170
°C
* Design certification
30
°C
Security function
Protection function operating
temperature at high temperature
Protection function hysteresis at
high temperature
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
GENERIC
MARKING DIAGRAM*
SOLDERING FOOTPRINT*
5.80
1.0
(Unit: mm)
0.32
0.65
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.
XXXXXXXXXX
YMDDD
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.
No.A1920-3/9
LV5769V
Pd max -- Ta
Allowable power dissipation, Pd max -- W
1.0
Specified board : 114.3 × 76.1 × 1.6mm3
glass epoxy board.
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
16 SS
COMP 2
15 ILIM
EN 3
14 VIN
13 NC
RT 4
NC 5
LV5769
12 SUBGND
SW 6
11 GND
CBOOT 7
10 VDD
9 LDRV
HDRV 8
Top view
No.A1920-4/9
LV5769V
Block Diagram
VIN 14
5V
5V
REGULATOR
REFERENCE
VOLTAGE
TSD
VIN UVLO
VDD UVLO
+
OCP Comp
ILIM 15
1.1V
SD
+
-
SD
S Q
R
VIN
S Q
R
+
Current
Amp
7 CBOOT
8 HDRV
DMAX = 90%
SAW WAVE
OSCILLATOR
fosc forcec
1/3
1.0V
0.5V
6 SW
CONTROL
Logic
+
PWM Comp
5V
10 VDD
9 LDRV
SS 16
0.67V
FB 1
+
SS Amp
+
+
-
0.1V
1.2V
shut down(SD)
Err
Amp
COMP 2
RT 4
11 GND
0.1V
+
-
FFOLD
Amp
+
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
COMP
Error amplifier output pin. Connect a phase compensation circuit between this pin and GND.
3
EN
ON/OFF pin.
4
RT
Oscillation frequency setting pin. Resistance is connected with this pin between GND.
5,13
N.C.
No connection *2
6
SW
Pin to connect with switching node. Upper part NchMOSFET external a source is connected with lower side NchMOSFET
7
CBOOT
external a drain.
Bootstrap capacity connection pin. This pin becomes a GATE drive power supply of an external NchMOSFET.
Connect a bypath capacitor between CBOOT and SW.
8
HDRV
An external the upper MOSFET gate drive pin.
9
LDRV
An external the lower MOSFET gate drive pin.
10
VDD
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.
11
GND
12
SUBGND
It is connected with the GND pin of 11pin internally. *3
14
VIN
Power supply pin. This pin is monitored by UVLO function. When the voltage of this pin becomes 8V or more by UVLO function,
15
ILIM
Reference current pin for current detection. The sink current of about 18.5μA flows to this pin.
The IC starts and the soft start function operates.
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 voltage of about 5μA.
This pin ends the soft start period by using the voltage of about 1.1V and the frequency fold back function becomes active.
*2: There is no problem even if it connects it with GND.
*3: Short-circuited and use 11pin and 12pin as GND.
No.A1920-5/9
LV5769V
I/O pin equivalent circuit chart
Pin No.
FB, SS
Equivalent Circuit
VDD 10
FB 1
SS 16
GND 11
Standard voltage
0.67V
0.1V
1.1V
1.3V
COMP
VDD 10
COMP 2
1.6V
GND 11
EN
VIN 14
EN 3
GND 11
RT
VDD 10
RT 4
GND 11
Continued on next page.
No.A1920-6/9
LV5769V
Continued from preceding page.
Pin No.
SW, CBOOT, HDRV
Equivalent Circuit
VIN 14
CBOOT 7
HDRV 8
SW 6
GND 11
LDRV
VDD 10
LDRV 9
GND 11
VDD
VIN 14
VDD 10
GND 11
ILIM
VIN 14
ILIM 15
GND 11
No.A1920-7/9
LV5769V
Boot sequence, UVLO, and TSD operation
UVLO 8V
7.3V
VIN
VDD=90%
VDD
VREF 0.67V
1.1V
Permisson of Foldback
SS
VOUT
HDRV-SW
LDRV
170 C
140 C
TSD
Sequence of overcurrent protection
VIN
ILIM
SW
Driving usually
Overcurrent protection oparation
Overcurrent protection oparation(Foldback oparation)
Soft start start section
Driving usually
IOUT
SS
FB
0.67V
FB=0.1V
No.A1920-8/9
LV5769V
Sample Application Circuit
VIN=
8.5 to 42V
C1
C7
R5
14
VIN
C6
15
ILIM
CBOOT 7
C2
Q1
HDRV 8
3 EN
ON/OFF
L
OUT
SW 6
Q2
16 SS
2 COMP
C5
R1
C3
C11
R6
C4
C9
FB 1
4 RT
R2
D2 R4
LDRV 9
C10
D1
GND
11
VDD 10
C8
R3
GND
ORDERING INFORMATION
Device
LV5769V-MPB-E
Package
SSOP16 (225mil)
(Pb-Free / Halogen Free)
Shipping (Qty / Packing)
LV5769VZ-MPB-E
SSOP16 (225mil)
(Pb-Free / Halogen Free)
90 / Fan-Fold
LV5769VZ-TLM-E
SSOP16 (225mil)
(Pb-Free / Halogen Free)
2000 / Tape & Reel
90 / Fan-Fold
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PS No.A1920-9/9
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