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PDF NCV1406 Data sheet ( Hoja de datos )
| Número de pieza | NCV1406 | |
| Descripción | PFM Step-Up DC-DC Converter | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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NCP1406, NCV1406
25 V/25 mA PFM Step-Up
DC-DC Converter
The NCP1406 is a monolithic step−up DC−DC converter operating
in a Pulse Frequency Modulation (PFM) scheme with constant peak
current control. It integrates a 0.8 A, 0.7 W internal power switch and
sensing resistor to monitor inductor current. This control scheme
maintains high efficiencies over the entire load current range. The
wide input voltage range, from 1.4V to 5.5 V, enables the user to
operate the device from a Li−Ion battery or a two−cell Alkaline
NiMH. Its ability to boost voltages up to 25 V, and to provide 1 W
output power, makes the NCP1406 the perfect solution for biasing
small and large OLED panels. This device also makes a perfect
solution for biasing a great number of white LEDs in series. A Chip
Enable pin allows the user to control the device to extend the battery
life during standby, and can be pulse−width modulated for white
LED applications. The versatility of the NCP1406 allows it to be
configured not only as a step−up converter, but also as an inverter and
as a step−down converter. This solution is proposed in a
space−saving TSOP−5 package.
Features
• 87% Efficiency at VOUT = 25 V, IOUT = 25 mA, VIN = 5 V
• Adjustable Output Voltage up to 25 V
• 0.8 A, 26 V Internal Power Switch
• Operating Input Voltage from 1.4 V to 5.5 V
• Low Startup Voltage of 1.8 V Typical at No Load
• Low Operating Current of 15 mA (Not Switching)
• Low Shutdown Current of 0.3 mA
• Operating Switching Frequency up to 1 MHz
• Output Voltage Soft−Start
• Thermal Shutdown Protection
• These are Pb−Free Devices
• NCV Prefix for Automotive and Other Applications Requiring
Unique Site and Control Change Requirements; AEC−Q100
Qualified and PPAP Capable
Typical Applications
• LCD Bias Supplies
• Small and Large OLED Display Drivers
• White LED Driver for Backlight Displays
• Personal Digital Assistants (PDA)
• Portable Applications:
♦ Cell Phones, Digital Cameras
♦ PDAs, Games, and Portable Video Players
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5
1
TSOP−5/SOT23−5/SC59−5
SN SUFFIX
CASE 483
MARKING
DIAGRAM
5
XXX AYW G
G
1
DAM
AET
A
= Device Marking − NCP1406
= Device Marking − NCV1406
= Assembly Location
Y = Year
W = Work Week
G = Pb−Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
CE 1
5 LX
FB 2
VDD 3
4 GND
(Top View)
ORDERING INFORMATION
Device
Package
Shipping†
NCP1406SNT1G TSOP−5 3000 Tape & Reel
(Pb−Free)
NCV1406SNT1G TSOP−5 3000 Tape & Reel
(Pb−Free)
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
© Semiconductor Components Industries, LLC, 2012
October, 2012 − Rev. 6
1
Publication Order Number:
NCP1406/D
1 page  
NCP1406, NCV1406
ELECTRICAL CHARACTERISTICS (VOUT = 25 V, TA = −40_C to +85_C (NCP1406), TA = −40_C to +105_C (NCV1406) for min/max
values, typical values are at TA = 25_C, unless otherwise noted.)
Characteristic
Symbol
Min Typ Max Unit
ON/OFF TIMING CONTROL
Minimum Off Time (VDD = 3.0 V, VFB = 0 V)
Maximum On Time (Current Not Asserted)
Maximum Duty Cycle
Minimum Startup Voltage (IOUT = 0 mA)
Minimum Startup Voltage Temperature Coefficient (TA = −40 to +105°C)
Minimum Hold Voltage (IOUT = 0 mA)
Soft−Start Time
LX (PIN 5)
Internal Switch Voltage (Note 4) (Note 5)
LX Pin On−State Resistance (VLX = 0.4 V, VDD = 5.0 V)
Current Limit (When ILX reaches ILIM, the LX switch is turned off by the
LX switch protection circuit) (Note 5)
toff
ton
DMAX
Vstart
DVstart
Vhold
tSS
VLX
Rsw(on)
ILIM
0.08 0.13 0.20
ms
0.58 0.90 1.40
ms
84 90 96 %
−
1.8 2.0
V
− 1.6 − mV/°C
−
1.7 1.9
V
− 3.0 8.0 ms
− − 26 V
− 0.7 − W
− 0.80 −
A
Off−State Leakage Current (VLX = 26 V)
CE (PIN 1)
CE Input Voltage (VDD = 3.0 V, VFB = 0 V)
High State, Device Enabled
Low State, Device Disabled
CE Input Current
High State, Device Enabled (VDD = VCE = 5.5 V)
Low State, Device Disabled (VDD = 5.5 V, VCE = VFB = 0 V)
TOTAL DEVICE
Supply Voltage
Undervoltage Lockout (VDD Falling)
Feedback Voltage
TA = 25°C
TA = −40 to +105°C
Feedback Pin Bias Current (VFB = 1.19 V)
Operating Current 1 (VFB = 0 V, VDD = VCE = 3.0 V, Maximum Duty Cycle)
Operating Current 2 (VDD = VCE = VFB = 3.0 V, Not Switching)
Off−State Current (VDD = 5.0 V, VCE = 0 V)
Thermal Shutdown (Note 5)
Thermal Shutdown Hysteresis (Note 5)
4. Recommended maximum VOUT up to 25 V.
5. Guaranteed by design, not tested.
ILKG
VCE(high)
VCE(low)
ICE(high)
ICE(low)
VDD
VUVLO
VFB
IFB
IDD1
IDD2
IOFF
TSD
TSDHYS
− 0.1 1.0 mA
0.9 − −
− − 0.3
−
−500
10
−150
500
−
V
V
nA
nA
1.4
−
1.178
1.170
−
−
−
−
−
−
−
1.0
1.190
1.190
15
0.7
15
0.3
140
10
5.5
1.3
1.202
1.210
45
1.5
25
1.3
−
−
V
V
V
nA
mA
mA
mA
°C
°C
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5
5 Page 
NCP1406, NCV1406
The detailed operation of NCP1406 can be best
understood by referring to the block diagram and typical
application circuits in Figures 1, 3, 4, and 5. The PFM
comparator monitors the output voltage via the external
feedback resistor divider by comparing the feedback
voltage with the reference voltage. When the feedback
voltage is lower than the reference voltage, the PFM
controller and driver circuit turn the internal switch on and
the current ramps up in the inductor. The switch will remain
on for the maximum on−time, 0.90 ms, or until the current
limit is reached (0.8 A), whichever occurs first. The
internal switch is then turned off and the inductor current
ramps down. The energy stored in the inductor will be
discharged to the output capacitor and load through the
Schottky diode. The internal switch will be turned off for
at least the minimum off−time, 0.13 ms, and will remain off
until the feedback voltage becomes lower than the
reference voltage. If the inductor current reaches zero
before then, the Schottky diode will be reverse biased and
the output capacitor will sustain the regulation by
providing current to the load, while the switch pin will be
left floating. The switch will turn back on when the
feedback voltage becomes again lower than reference
voltage. This switching cycle is then repeated to attain
voltage regulation. The device operating current is
typically 15 mA (not switching), and can be further reduced
to about 0.3 mA when the chip is disabled (VCE < 0.3 V).
Soft Start
There is a soft start circuit in NCP1406. When power is
applied to the device, the soft−start circuit limits the device
to switch at a small duty cycle initially. The duty cycle is
then increased gradually until the output voltage is in
regulation. With the soft−start circuit, the output voltage
over−shoot is minimized and the startup capability with
heavy loads is also improved.
ON/OFF Timing Control
The timing control of the converter is application
dependent. The maximum on−time (inductor current
ramping up) is set at a typical 0.9 ms if the inductor current
does not reach current limit 0.8 A. The minimum off−time
(inductor current ramping down) is set at a typical 0.13 ms
to ensure the complete energy transfer to the output. The
switching frequency can be as high as 1.0 MHz.
Voltage Reference and Output Voltage
The internal bandgap voltage reference is trimmed to
1.19 V with an accuracy of "1.0% at 25°C. The voltage
reference is connected to the non inverting input of the
PFM comparator and the inverting input of the PFM
comparator is connected to the FB pin. The output voltage
can be set by connecting an external resistor divider to the
output and using the FB pin. The output voltage
programmable range is from VIN to 25 V.
Current Limit
The current limit circuit limits the maximum current
flowing through the LX pin to a typical of 0.8 A during the
internal switch turn−on period. When the current limit is
exceeded, the switch will be turned off. Since the peak
inductor current is limited to the current limit, saturation of
inductor is prevented and output voltage over−shoot during
startup is also minimized.
Internal Switch
The NCP1406 integrates a 26 V open drain internal
switch which allows high output voltage up to 25 V to be
generated from simple step−up topology.
FB Pin Short−Circuit/Open−Circuit Protection
The FB protection circuit is realized by sensing the
drain−to−source leakage current of the N−Ch MOSFET.
When the FB pin connection is shorted or opened, the
converter switches at maximum duty cycle, the peak of
VLX and the VOUT will build up, and the leakage current
will increase. When the leakage current increases to a
certain level, the protection circuitry will trigger and the
converter will stop switching. Therefore, the peak of VLX
will immediately stop increasing at a certain level before
the N−Ch MOSFET is damaged. However, the sensing of
the leakage current is not very accurate and cannot be too
close to the normal 26 V maximum operating condition.
Therefore, the VLX is around 30 V to 40 V during a FB pin
protection fault. This is not destructive to the chip though.
Input Undervoltage Lockout
An undervoltage lockout circuit continuously monitors
the voltage at the VDD pin. The device will be disabled if
the VDD pin voltage drops below the UVLO threshold
voltage. In the same manner, the device will be enabled if
the VDD pin voltage goes above the UVLO threshold.
Thermal Shutdown
When the chip junction temperature exceeds 140°C, the
entire IC is shutdown. The IC will resume operation when
the junction temperature drops below 130°C.
Enable/Disable Operation
An external pin, CE, allows the user to enable or disable
the converter. This feature proves useful when the system
is in a standby mode by increasing battery life through
significantly decreased current consumption. A 150 nA
pull−up current source ties the CE pin to the VDD pin
internally. Therefore, leaving the CE pin floating will
enable the NCP1406.
With no other connections to the CE pin, it can be
independently controlled by an external signal. When the
voltage at the CE pin is equal to or greater than 0.9 V, the
chip will be enabled, which means the device is in normal
operation. When the voltage at the CE pin is less than 0.3 V,
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11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet NCV1406.PDF ] | |
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