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PDF UPC1933GR Data sheet ( Hoja de datos )
| Número de pieza | UPC1933GR | |
| Descripción | DC-DC CONVERTER CONTROL IC | |
| Fabricantes | NEC | |
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DATA SHEET
BiCMOS INTEGRATED CIRCUIT
µ PC1933
DC-DC CONVERTER CONTROL IC
DESCRIPTION
The µ PC1933 is an IC that controls a low-voltage input DC-DC converter. This IC is suitable for an operation with3-V,
3.3-V input or a lithium ion secondary battery input, because the minimum operating supply voltage is 2.5 V.
Because of its wide operating voltage range, it can also be used to control DC-DC converters that use an AC adapter for
input.
FEATURES
• Low supply voltage: 2.5 V (MIN.)
• Operating voltage range: 2.5 to 20 V (breakdown voltage: 30 V)
• Timer latch circuit for short-circuit protection.
• Ceramic capacitor with low capacitance (0.1 µ F) can be used for short-circuit protection.
• Open drain output (1 cannel: This output can be used to control a step-down converter, a step-up converter.)
• Dead time is internally fixed to 85 %.
• Soft start function (with a circuit to convert the timer latch circuit.)
ORDERING INFORMATION
Part Number
Package
µ PC1933GR
8-pin plastic SOP (5.72 mm (225))
The information in this document is subject to change without notice. Before using this document, please
confirm that this is the latest version.
Not all devices/types available in every country. Please check with local NEC representative for
availability and additional information.
Document No. G13690EJ3V0DS00 (3rd edition)
Date Published April 2000 NS CP (K)
Printed in Japan
The mark 5 shows major revised points.
1998
1 page  
µ PC1933
1. ELECTRICAL SPECIFICATIONS
Absolute Maximum Ratings (unless otherwise specified, TA = 25 °C)
Parameter
Supply voltage
Output voltage
Output current (open drain output)
Total power dissipation
Operating ambient temperature
Storage temperature
Symbol
VCC
VO
IO
PT
TA
Tstg
Ratings
30
30
21
480
−20 to + 85
−55 to + 150
Unit
V
V
mA
mW
°C
°C
Caution Product quality may suffer if the absolute maximum rating is exceeded even momentarily for any
parameter. That is, the absolute maximum ratings are rated values at which the product is on the verge
of suffering physical damage, and therefore the product must be used under conditions that ensure
that the absolute maximum ratings are not exceeded.
Recommended Operating Conditions
Parameter
Supply voltage
Output voltage
Output current
Operating temperature
Oscillation frequency
Symbol
VCC
VO
IO
TA
fOSC
2.5
0
−20
20
Ratings
Unit
20 V
20 V
20 mA
+85 °C
800 kHz
Caution The recommended operating range may be exceeded without causing any problems provided that the
absolute maximum ratings are not exceeded. However, if the device is operated in a way that exceeds
the recommended operating conditions, the margin between the actual conditions of use and the
absolute maximum ratings is small, and therefore thorough evaluation is necessary. The recommended
operating conditions do not imply that the device can be used with all values at their maximum values.
Data Sheet G13690EJ3V0DS00
5
5 Page 
µ PC1933
2. CONFIGURATION AND OPERATION OF EACH BLOCK
Figure 2-1 Block Diagram
FB 8
II 1
Error amplifier
0.3 V
VREF 4
VCC 3
Reference
voltage
section
Dead time setting: 85 %
(internally fixed)
DLY
2
CDLY
Soft start
select switch
Oscillation
section
PWM
comparator
Under voltage
lock-out
section
Output
section
SCP
comparator
1.92 V
Q1 Q2
S
Timer latch for
short-circuit
protection section
Q
Q
7 RT
5 OUT
6 GND
2.1 Reference Voltage Generator
The reference voltage generator is comprised of a band-gap reference circuit, and outputs a temperature-compensated
reference voltage (2.1 V). The reference voltage can be used as the power supply for internal circuits, or as a reference
voltage, and can also be accessed externally via the VREF pin (pin 4).
2.2 Oscillator
The oscillator self-oscillates if a timing resistor is attached to the RT pin (pin 7). This oscillator waveform is input to the
inverted input pin of the PWM comparator to determine the oscillation frequency.
2.3 Under Voltage Lock-out Circuit
The under voltage lock-out circuit prevents malfunctioning of the internal circuits when the supply voltage is low, such as
when the supply voltage is first applied, or when the power supply is interrupted. When the voltage is low, the output
transistor is cut off at the same time.
2.4 Error Amplifier
The non-inverted input pin of the error amplifier is connected internally to 0.3 V (the input threshold voltage is 0.3 V
(TYP.)). The first stage of the error amplifier is a P-channel MOS transistor input.
Data Sheet G13690EJ3V0DS00
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet UPC1933GR.PDF ] | |
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