Buck Controller. HM1483C Datasheet

HM1483C Controller. Datasheet pdf. Equivalent

HM1483C Datasheet
Recommendation HM1483C Datasheet
Part HM1483C
Description Wide Range Synchronous Buck Controller
Feature HM1483C; HM1483C Wide Range Synchronous Buck Controller Feature ● Wide Input Voltage Range: 8V to 30V ● Up .
Manufacture H&M semi
Datasheet
Download HM1483C Datasheet




H&M semi HM1483C
HM1483C
Wide Range Synchronous Buck Controller
Feature
Wide Input Voltage Range: 8V to 30V
Up to 93% Efficiency
Programmable Switching Frequency up to up
to 500kHz
No Loop Compensation Required
Programmable current limit
Thermal Shutdown
Available in SOP-8L Package
Application
Car Charger / Adaptor
Pre-Regulator for Linear Regulators
Distributed Power Systems
Battery Charger
Description
The +0& is a synchronous step down regu-
lator from a high voltage input supply. Operating
with an input voltage range from 8V to 30V, the
+0& achieves 2.8A continuous output cur-
rent with excellent load and line regulation. The
switching frequency is programmable from 130
kHz to 500 kHz and the synchronous architec-
ture provides for highly efficient designs. Current
mode operation provides fast transient response
and eases loop stabilization.
The +0& requires a minimum number of
readily available standard external components.
Other features include cable compensation, pro-
grammable current limit and thermal shutdown.
The +0& converters are available in the
industry standard SOP-8L packages.
Typical Application Circuit
* The output voltage is set by R2 and R3: VOUT = 1.21V • [1 + (R2/R3)].
* RT: RT is optional. The resistor range is from 130Kto 1.5 M. +0& can work when keeping RT pin
floating. The default frequency is 130KHZ.
* ILIM: +0& can work when keeping ILIM pin floating, with 3A limit current in this situation.

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H&M semi HM1483C
Pin Assignment and Description
HM1483C
PIN
NAME
1
FB
2
RT
3
ILIM
4
VIN
5, 6
SW
7, 8
GND
DESCRIPTION
Feedback
Frequency Setting
Current Limit
Input Supply Voltage
Switch Node
Ground
Absolute Maximum Ratings (Note 1)
Input Supply Voltage ............................................................................................................-0.3V 35V
FB, ILIM, RT Voltages........................................................................................................... -0.3V 6V
SW Voltage ................................................................................................................-0.3V (VIN + 1V)
Operating Temperature Range (Note 2)...........................................................................-40+85
Storage Temperature Range.......................................................................................... -65+150
Junction Temperature Range.........................................................................................................+150
Lead Temperature (Soldering, 10 sec.)......................................................................................... +265
Note 1: Stresses beyond those listed Absolute Maximum Ratings may cause permanent damage to the device. Expo-
sure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime.
Note 2: The +0& is guaranteed to meet performance specifications from 0to 70. Specifications over the –
40to 85operating temperature range are assured by design, characterization and correlation with statistical proc-
ess controls.


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H&M semi HM1483C
HM1483C
Electrical Characteristics
Operating Conditions: TA=25℃, VIN=12V, R2=470k, R3=150k, unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
VIN
Operating Voltage Range
IQ
Quiescent Current
ILOAD=0A
VUVLO
Input UVLO Threshold
ΔVUVLO
UVLO Hysteresis
VFB
Regulated Voltage
IFB
Feedback Pin Input Current
fOSC
fOSC_MAX
Oscillator Frequency Range Float RT Pin
Maximum Oscillator Fre-
quency
DC
Max Duty Cycle
MIN
8
10
1.188
TYP
15
4.25
50
1.21
130
500
MAX
30
UNITS
V
20
mA
4.5
V
100
mV
1.236
V
0.05
μA
kHz
kHz
90
%
ILIM_def
ILIM-TH
RPFET
Default Limit Current
Current Limit Sense Pin
Source Current
RDS(ON) of P-Channel FET
Float ILIM Pin
3.0
A
7
8.5
10
μA
40
m
RNFET
RDS(ON) of N-Channel FET
30
m
TSD
Thermal Shutdown
Temperature Rising
145
ΔTSD
Thermal Shutdown Hystere-
sis
30

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