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PDF R1244N001B Data sheet ( Hoja de datos )
| Número de pieza | R1244N001B | |
| Descripción | 30V Step Down DC/DC converter | |
| Fabricantes | Richo | |
| Logotipo |  |
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R1244N001B
1.2A, 30V Step Down DC/DC converter
NO.EA-293-111123
OUTLINE
The R1244N001B is CMOS-based Step-down DC/DC converter with an internal N-channel high side Tr.
(RDSON Typ. 0.35Ω) power switch. The R1244N001B can provide the maximum 1.2A output current. The IC
consists of an oscillator, a PWM control circuit, a reference voltage unit, an error amplifier, phase compensation
circuits, a slope compensation circuit, a soft-start circuit, protection circuits, an internal voltage regulator, and a
switch for a bootstrap circuit. To make a step-down DC/DC converter with the R1244N001B, as external
components, an inductor, resistors, a diode, and capacitors are necessary.
The R1244N001B is a current mode PWM step-down DC/DC converter, but the external current sense resistor
is not necessary. Fast transient response and high efficiency characteristics are realized with the R1244N001B.
The R1244N001B allows the use of ceramic capacitors. The oscillator frequency is internally fixed at 1.25MHz.
Cycle by cycle current limit provides protection against over-current. Fold back circuit reduces frequency into
1/4 against shorted output and realizes limiting the Lx current. Thermal shutdown function and UVLO are also
built-in.
FEATURES
● Operating Voltage ················································ 4.5V~30V
● Internal Nch MOSFET Driver··································· Typ.RON=0.35Ω
● Adjustable output voltage with external resistor ······ 0.8V~15V
● Feed back voltage ··················································· 0.8V±1.5%
● Peak Current limit function ······································ Typ. 2.0A
● UVLO function
● Operating Frequency ··············································· 1.25MHz ( 310kHz : fold condition)
● Short protection for output ······································· Fold Back
● Ceramic Capacitor compatible
● Stand-by function ····················································· Typ. 0μA
● Package··································································· SOT-23-6W
APPLICATIONS
● Power source for digital home appliance
● Power source for hand-held communication equipment, cameras, video instruments such as VCRs,
camcorders.
● Power source for battery-powered equipment.
● Battery Charger
1
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1 page  
ELECTRICAL CHARACTERISTICS
R1244N001B
Symbol
VIN
IIN
VUVLO1
VUVLO2
VFB
∆VFB/∆T
fosc
fFLB
Maxduty
tMIN
tstart
RLXH
ILXHOFF
ILIMLXH
VCEH
VCEL
IFB
ICEH
ICEL
TTSD
Istandby
Item
Operating Input Voltage
VIN Consumption Current
UVLO Detector Voltage
UVLO Released Voltage
FB Voltage Tolerance
VFB Voltage Temperature Coefficient
Oscillator Frequency
Fold back Frequency
Oscillator Maximum. Duty Cycle
Minimum On Time
Soft-start Time
LX High Side Switch ON Resistance
LX High Side Switch Leakage Current
LX High Side Switch Limited Current
CE “H” Input Voltage
CE “L” Input Voltage
VFB Input Current
CE “H” Input Current
CE “L” Input Current
Thermal Shutdown Detect Temperature
Standby Current
(Otherwise notified in Conditions, VIN= 12V, Ta=25ºC)
Conditions
MIN. TYP. MAX. Unit
4.5 30 V
VIN=30V, VFB=1.0V
Falling
Rising
0.5 1.0
VUVLO2
-0.2
3.7 4.0 4.2
mA
V
V
0.788 0.800 0.812 V
-40ºC ≤ Ta ≤ 85ºC
±150
ppm/ºC
1000 1250 1500 kHz
VFB<0.56V
310 kHz
85 %
100 ns
VFB=0.72V
0.2 0.4 0.6
0.35
05
ms
Ω
μA
2.0 A
1.6 V
0.3 V
-1.0 1.0 μA
-1.0 1.0 μA
-1.0 1.0 μA
Hysteresis 30ºC
160 ºC
VIN=30V
0 5 μA
RECOMMENDED OPERATING CONDITIONS (ELECTRICAL CHARACTERISTICS)
All of electronic equipment should be designed that the mounted semiconductor devices operate within the
recommended operating conditions. The semiconductor devices cannot operate normally over the recommended
operating conditions, even if when they are used over such conditions by momentary electronic noise or surge. And the
semiconductor devices may receive serious damage when they continue to operate over the recommended operating
conditions.
5
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5 Page 
R1244N001B
4) FB Voltage VS. Temperature
R1244N001B
0.802
0.800
0.798
0.796
0.794
0.792
0.790
0.788
0.786
0.784
0.782
-50
-25
(VIN=12V)
0 25 50
Ta (°C)
75 100
5) Oscillator Frequency VS. Temperature
R1244N001B
1400
(VIN=12V)
1350
1300
1250
1200
1150
1100
-50 -25 0 25 50 75 100
Ta (°C)
6) Maxduty VS. Temperature
R1244N001B
7) Fold-Back Frequency VS. Temperature
R1244N001B
86 (VIN=12V)
85
84
83
82
81
80
-50 -25 0 25 50 75 100
Ta (°C)
330
320
310
300
290
280
270
-50
-25
0 25 50
Ta (°C)
(VIN=12V)
75 100
11
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11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet R1244N001B.PDF ] | |
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