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PDF NCV891130 Data sheet ( Hoja de datos )
| Número de pieza | NCV891130 | |
| Descripción | DualMode Step-Down Regulator | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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NCV891130
1.2 A, 2 MHz Low-IQ Dual-
Mode Step-Down Regulator
for Automotive
The NCV891130 is a Dual Mode regulator intended for Automotive,
battery−connected applications that must operate with up to a 45 V
input supply. Depending on the output load, it operates either as a PWM
Buck Converter or as a Low Drop−Out Linear Regulator, and is suitable
for systems with low noise and Low Quiescent Current requirements
often encountered in automotive driver information systems. A reset
pin (with fixed delay) simplifies interfacing with a microcontroller.
The NCV891130 also provides several protection features expected
in automotive power supply systems such as current limit, short circuit
protection, and thermal shutdown. In addition, the high switching
frequency produces low output voltage ripple even when using small
inductor values and an all−ceramic output filter capacitor – forming a
space−efficient switching regulator solution.
Features
• 30 mA Iq in Light Load Condition
• 1.2 A Maximum Output Current in PWM Mode
• Internal N−channel Power Switch
• VIN Operating Range 3.7 V to 36 V
• Withstands Load Dump to 45 V
• Logic Level Enable Pin can be Tied to Battery
• Fixed Output Voltage of 5.0 V, 4.0 V or 3.3 V
• 2 MHz Free−running Switching Frequency
• ±2 % Output Voltage Accuracy
• NCV Prefix for Automotive Requiring Site and Control Changes
• These Devices are Pb−Free and are RoHS Compliant
Typical Applications
• Audio
• Infotainment
• Instrumentation
• Safety−Vision Systems
VIN
CIN
RESET
CDRV
NCV891130
VIN
DRV
SW
CBST
BST
RSTB VOUT
GND
EN
DBST
L1
DFW
EN
VOUT
COUT
Figure 1. Typical Application
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8
1
SOIC−8
EXPOSED PAD
CASE 751AC
MARKING DIAGRAM
8
891130XX
ALYW
G
1
With XX = 33 for 3.3 V Output
= 40 for 4.0 V Output
= 50 for 5.0 V Output
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Device
PIN CONNECTIONS
VIN 1
8 SW
DRV 2
7 BST
RSTB 3
6 VOUT
GND 4
(Top View)
5 EN
ORDERING INFORMATION
See detailed ordering and shipping information on page 17 of
this data sheet.
© Semiconductor Components Industries, LLC, 2015
January, 2015 − Rev. 1
1
Publication Order Number:
NCV891130/D
1 page  
NCV891130
Table 3. ELECTRICAL CHARACTERISTICS
VIN = 4.5 to 28 V, VEN = 5 V, VBST = VSW + 3 V, CDRV = 0.1 mF, for typical values TJ = 25°C, Min/Max values are valid for the temperature
range −40°C v TJ v 150°C unless noted otherwise, and are guaranteed by test, design or statistical correlation (Notes 4, 5)
Parameter
Test Conditions
Symbol Min Typ Max Unit
RESET
Output voltage threshold at which the RSTB VOUT decreasing
signal goes low
5.0 V option
4.0 V option
3.3 V option
VRESET
4.50
3.6
2.97
4.625
3.7
3.05
4.75
3.8
3.14
V
Hysteresis on RSTB threshold
VOUT increasing
5.0 V option
4.0 V option
3.3 V option
VREShys
mV
25 60 100
20 50
80
17 40
66
Noise−filtering delay
From VOUT<VRESET to RSTB pin
going low
tfilter
10
25 ms
Restart Delay time
From VOUT>VRESET+VREShys to
high RSTB
tdelay
14
16
18
ms
Low RSTB voltage
GATE VOLTAGE SUPPLY (DRV pin)
RRSTBpullup = VOUTreg/1 mA, VOUT > 1 V VRSTBlow
0.4 V
Output Voltage
DRV UVLO START Threshold
DRV UVLO STOP Threshold
DRV UVLO Hysteresis
DRV Current Limit
VDRV = 0 V
VIN OVERVOLTAGE SHUTDOWN MONITOR
VDRV
3.1
3.3
3.5
V
VDRVSTT 2.7 2.9 3.05
V
VDRVSTP 2.5 2.8 3.0
V
VDRVHYS 50
200 mV
IDRVLIM
21
50 mA
Overvoltage Stop Threshold
Overvoltage Start Threshold
Overvoltage Hysteresis
ENABLE (EN)
VIN increasing
VIN decreasing
VOVSTP
VOVSTT
VOVHY
36.5
36.0
0.25
37.7
37.3
0.40
39.0
38.8
0.50
V
V
V
Logic low threshold voltage
Logic high threshold voltage
EN pin input current
THERMAL SHUTDOWN
VENlow
VENhigh
IENbias
0.8
0.2
V
2V
1 mA
Activation Temperature
TSD
155
190 °C
Reset temperature
TSDrestart 135
185 °C
Hysteresis
THYS
5
20 °C
4. Refer to ABSOLUTE MAXIMUM RATINGS and APPLICATION INFORMATION for Safe Operating Area.
5. Performance guaranteed over the indicated operating temperature range by design and/or characterization tested at TJ = TA = 25°C. Low
duty cycle pulse techniques are used during testing to maintain the junction temperature as close to ambient as possible.
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.
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5 Page 
NCV891130
APPLICATION INFORMATION
Hybrid Low−Power Mode
A high−frequency switch−mode regulator is not very
efficient in light load conditions, making it difficult to
achieve low Iq requirements for sleep−mode operation. To
remedy this, the NCV891130 includes a low−Iq linear
regulator that turns on at light load, while the PWM
regulator turns off, ensuring a high−efficiency low−power
operation. Another advantage of linear mode is the tight
regulation free of voltage ripple usually associated with
low−Iq switchers in light load conditions.
At initial start−up the NCV891130 always runs in PWM
converter mode, regardless of the output current, and goes
through a soft start. It then stays in PWM mode if the output
current is high enough. If the output current is low, the
NCV891130 transitions to Linear Regulator mode, after a
300 ms period during which it assesses the level of ouput
current. Note that the Reset signal needs to be high before the
IC starts to look at the output current level.
It stays in this low−power mode until the output current
exceeds the ILINtoSW limit: it then transitions to PWM
converter mode. This transition happens in less than 2 ms, so
that the transient response is not affected by the mode change.
Once the NCV891130 has transitioned to switcher mode,
it cannot go back to low−Iq mode before a 500 ms blanking
period has elapsed, after which it starts looking at the output
current level.
If the NCV891130 is in Low−Iq Linear Regulator mode
in normal battery range, it will transition to switcher mode
when VIN increases above VLINtoSW(HV), regardless of the
output current. Similarly, if the NCV891130 is in PWM
mode and VIN is higher than VFLDUP, it will not transition
to Low−Iq Linear mode even if the output current becomes
lower than INtoL.
At low input voltage, the NCV891130 stays in low−Iq
mode down to VLINtoSW(LV) if it entered this mode while in
normal battery range. However it may not enter low−Iq
mode below 8 V depending on the charge of the bootstrap
capacitor (see Bootstrap section and typical characteristics
curves for details).
Figures 29 and 30 show a mode transition for a large load
transient, while Figures 31 and 32 show a transition on a
small load transient.
Figure 29. VIN = 13 V, VOUT = 5 V, 20 mA to 1.2 A at 1 A/ms – with Mode Transition
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| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet NCV891130.PDF ] | |
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