ENA2331 D

Ordering number : ENA2331
LV5762QA
Bi-CMOS IC
Step-down Switching Regulator
http://onsemi.com
Overview
LV5762QA is a 1ch step-down voltage switching regulator.
Function
• 1ch step-down switching regulator controller
• Load-independent soft start circuit
• Frequency fold back function
• ON/OFF function
• Built-in pulse-by-pulse OCP circuit.
It is detected by using ON resistance of an external MOS.
VQFN16J ( 3.0 × 3.0 )
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Symbol
Supply voltage
VIN max
Allowable power dissipation
Pd max
Operating temperature
Storage temperature
Conditions
Ratings
Unit
45
V
0.65
W
Topr
–40 to 85
°C
Tstg
–55 to 150
°C
*)
* Specified board: 24.0mm × 15.0mm ×1.6mm, glass epoxy board (2-layer).
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.
Recommended Operating Conditions at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
Supply voltage range 1
VIN
8 to 42
V
Error amplifier input coltage
VFB
0 to 1.6
V
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.
ORDERING INFORMATION
See detailed ordering and shipping information on page 6 of this data sheet.
Semiconductor Components Industries, LLC, 2014
May, 2014
51514NK 20120928-S00002 No.A2331-1/6
LV5762QA
Electrical Characteristics at Ta = 25°C, VIN = 24V
Parameter
Symbol
Conditions
Ratings
min
typ
Unit
max
Reference voltage block
Internal reference voltage
Vref
Including offset of E/A
5V power supply
VDD
IOUT=0 to 5mA
0.695
0.705
0.715
V
4.7
5.2
5.7
V
870
1000
1130
Triangular waveform oscillator block
Oscillation frequency
fOSC
Frequency variation
fOSC_DV
VIN=8 to 42V
VOSC_FB
Detect IN voltage after the end of SS
Oscillatory frequency fold back
kHz
1
%
0.5
V
detection voltage
Oscillatory frequency after fold back
fOSC_FB
100
150
200
kHz
3.4
4.3
V
ON/OFF circuit block
VEN_on
VIN=8 to 42V
VEN_off
VIN=8 to 42V
1.1
1.3
ISS_SC
EN > 5V, SS=0V
3.4
4.3
Soft start sink current
ISS_SK
EN < 1V, VDD=5V, SS=1V
Voltage to end the soft start function
VSS_END
0.7
0.9
1.1
V
UVLO lock release voltage
VUVLO
7.0
7.4
7.8
V
UVLO hysteresis
VUVLO_H
IC start-up voltage
IC off voltage
V
Soft start circuit block
Soft start source current
5.2
2
μA
mA
UVLO circuit block
0.6
V
Error amplifier
Input bias current
IEA_IN
Error amplifier transconductance
GEA
Common mode input voltage range
VEA_R
VIN=8 to 42V
Sink output current
IEA_OSK
FB=1.0V
Source output current
IEA_OSC
FB=0V
Current detection amplifier gain
GISNS
1000
1400
0.0
100
nA
1800
μA/V
1.6
V
–100
μA
100
μA
1.3
Over current limiter circuit block
Reference current
ILIM
Over current detection comparator
VLIM_OFS
+10%
μA
–5
+5
mV
VIN–0.45
VIN
V
V
–10%
20
offset voltage
Over current detection comparator
common mode input range
PWM comparator
Input threshold voltage
Vtmax
Duty cycle=DMAX
0.95
1.1
1.25
Vt0
Duty cycle=0%
0.35
0.45
0.55
Maximum ON duty
DMAX
75
80
%
RONH
5
Ω
RONL
5
Ω
V
Output block
Output stage ON resistance
(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)
The whole device
Standby current
ICCS
EN < 1V
Mean consumption current
ICCA
EN > 5V
60
3.6
μA
mA
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.
No.A2331-2/6
LV5762QA
Package Dimensions
unit : mm
WQFN16 3x3, 0.5P / VQFN16J
CASE 510AX
ISSUE A
GENERIC
MARKING DIAGRAM*
XXXXXX
YMDDD
XXXXX = Specific Device Code
Y = Year
M = Month
No.A2331-3/6
LV5762QA
COMP
1
EN
2
SW
3
FB
NC
NC
SS/
HICCUP
Pin Assignment
16
15
14
13
(17)
SUBGND
6
7
8
NC
LDRV
HDRV
5
NC
CBOOT 4
12
ILIM
11
VIN
10
GND
9
VDD
(TOP VIEW)
Pin Function
Pin No.
Pin name
Function
1
COMP
Error amplifier output pin.
2
EN
ON/OFF pin.
3
SW
Pin to connect with switching node. The source of Nch MOSFET connects to this pin.
4
CBOOT
Bootstrap capacity connection pin. This pin becomes a GATE drive power supply of an external Nch MOSFET.
5
HDRV
An external the upper MOSFET gate drive pin.
6
NC
No connection
8
LDRV
An external the lower MOSFET gate drive pin.
9
VDD
Power supply pin for an external the MOS-FET gate drive.
10
GND
Ground pin. Each reference voltage is based on the voltage of the ground pin.
11
VIN
Power supply pin.
Connect a phase compensation circuit between this pin and GND.
Connect a bypath capacitor between CBOOT and SW.
7
14
15
This pin is monitored by UVLO function. When the voltage of this pin becomes 7.8V or more by UVLO function, The IC
starts and the soft start function operates.
12
ILIM
Reference current pin for current detection.
The sink current of about 20μA 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 Nch MOSFET
is off by operating the current limiter comparator. This operation is reset with respect to each PWN pulse.
13
SS/HICCUP
Pin to connect a capacitor for soft start. A capacitor for soft start is charged by using the voltage of about 4.3μA.
This pin ends the soft start period by using the voltage of about 0.9V and the frequency fold back function becomes
active.
16
FB
Error amplifier reverse input pin.
By operating the converter, the voltage of this pin becomes 0.7V.
The voltage in which the output voltage is divided by an external resistance is applied to this pin.
Also, the oscillation frequency become one-eighth when the voltage of this pin becomes 0.4V or less after soft start
function.
17
SUBGND
Connect to GND
No.A2331-4/6
LV5762QA
Block Diagram
VIN
5V
REGULATOR
REFERENCE
VOLTAGE
TSD
UVLO
S
ILIM
+
VIN
OCP Comp
+
-
Current
Amp
+
1.3V
-
Q
R
HICCUP
Comp
CBOOT
+
OCP
0.9V
-
SD
SS/
HICCUP
FB
0.7V
HDRV
SS
Comp
SW
R
SD
+
+
-
Q
S
SAW WAVE
OSCILLATOR
HICCUP
Comp
D-max=90% 1.1V
0.45V
+
-
fOSC forced
1/8
COMP
CONTROL
Logic
VDD
+
LDRV
-
GND
+
Shutdown(SD)
0.5V
EN
Sample Application Circuit
VIN=8V to 42V
C7
R5
VIN
C6
ILIM
CBOOT
ON/OFF
C1
C2
Q1
HDRV
EN
LV5762QA
LV5762LF
L
OUT
SW
Q2
SS/HICCUP
R4
LDRV
C4
D1
FB
C5
R1
COMP
GND
R2
C3
C31
C9
VDD
D2
C10
R3
C8
GND
No.A2331-5/6
LV5762QA
ORDERING INFORMATION
Device
LV5762QA-NH
Package
VQFN16J
(Pb-Free / Halogen Free)
Shipping (Qty / Packing)
2000 / Tape & Reel
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PS No.A2331-6/6
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