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HM1483 Datasheet Preview

HM1483 Datasheet

3.1A Monolithic Step-Down Switching Regulator

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HM1483
30V, 3.1A Monolithic Step-Down Switching Regulator in TSOT23-8
1 Features
3.0A continuous output current capability
6.5V to 30Vwide operating input range with input
Over Voltage Protection
Integrated 36V, 65mΩ high side and 36V, 45mΩ low
side power MOSFET switches
Up to 95% efficiency
Programmable Soft-Start limits the inrush current at
turn-on
Stable with Low ESR Ceramic Output Capacitors
Fixed 300KHz Switching Frequency
Input Under-Voltage Lockout.
Input over-voltage protection to protect device from
working in high voltage and high current condition
Output short protection with both high side current
limit and low side current limit to protect the device
in hard short
Output Over-Voltage Protection
Over-Temperature Protection
Small size Flip-Chip TSOT23-8 Package, best for
narrow space application. More reliable and less
parasitic voltage spike comparing with bonding wire
package
2 Applications
Set-Top-Box
Televisions
DVD, LCD Displays
OLPC, Netbook
Datacom, XDSL modems
Distributed Power Systems
USB car charger
Portable charging device
General purpose
3 Description
HM1483 is a monolithic 30V, 3.0A step-down switch
regulator. HM1483 integrates a 36V 65mΩ high side
and a 36V, 45mΩ low side MOSFETs to provide 3.0A
continuous load current over a 6.5V to 36V wide
operating input voltage with 30V input over voltage
protection. Peak current mode control provides fast
transient responses and cycle-by-cycle current
limiting. Programmable soft-start prevents inrush
current at power-up. Flip-chip TSOT23-8 package
makes the part best fit narrow space applications
4 Typical Application Schematic
VIN/6.5V-30V
C1
100uF/50V
C2
0.1uF/50V
8 V2IN
2 8EN
6
1
BST
C5
100nF/25V
SW3 7
53
FB
+0
R4
4 COMP
300K
1%
7
C7
100pF/10V
GND
1
65
SS
Fig. 1 Schematic
L1
22uH
R1
46K4
1%
R2
10K
1%
Vout/5V
C4
0.1uF
C3
100uF
C6
47pF
C8
100nF/25V
* C6 47pF is optional
Fig. 2 Efficiency curve
1 of 14




H&M semi

HM1483 Datasheet Preview

HM1483 Datasheet

3.1A Monolithic Step-Down Switching Regulator

No Preview Available !

5 Pin Configuration and Functions
TSOT23-8 Package (Top View)
GND
1
8
VIN
EN
2
7
SW
+0
FB
3
6
BST
COMP
4
5
SS
HM1483
Pin
Number Name
1
GND
2
EN
3
FB
4
COMP
5
SS
6
BST
7
SW
8
VIN
Pin-Functions
Description
Ground.
Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to turn on
the regulator; low to turn it off. EN pin is pulled to VIN internally by a larger resistor.
Feedback Input. FB senses the output voltage. Connect FB with a resistor divider connected
between the output and ground. FB is a sensitive node. Keep FB away from SW and BST
pin. It is better to connect a 47pF capacitor between FB and GND to filter out possible
coupling noise from other noisy nodes such as SW, BST and VIN.
Connect compensation network to make the converter work stably.
This pin is used to program soft-start time, connect a cap to program soft-start time.
Boot-Strap pin. Connect a 0.1µF or greater capacitor between SW and BST to power the
high side gate driver. A resistor can be added between the 0.1uF capacitor and BST pin to
slower down high side driver speed and EMI noise.
Power Switching pin. Connect this pin to the switching node of inductor.
Power Input. VIN supplies the power to the IC. Supply VIN with a 6.5V to 30V power source.
Bypass VIN to GND with a large capacitor and at least another 0.1uF ceramic capacitor to
eliminate noise on the input to the IC. Put the capacitors close to VIN and GND pins. It is
better to minimize the 0.1uF ceramic capacitor, VIN pin, GND pin loop area to reduce EMI
noise and voltage spike on high side power device.
6 Device Marking Information
Part Number Order Information
HM1483
HM1483
Package
TSOT23-8
83**: Part Number
RAABB: R: Year; AABB: Manufacturing Code
7Specifications
7.1 Absolute Maximum Ratings(Note1)
Input Voltages
Output Voltages
PARAMETER
VIN to GND
VEN to GND
VSS to GND
VFB to GND
VCOMP to GND
VBST to VSW
VSW to GND
Package Qty
3000
Top Marking
83**
RAABB
MIN
-0.3
-0.3
-0.3
-0.3
-0.3
-0.3
-1
MAX
36
6
6
6
6
6
VIN+ 0.3
Unit
V
V
2 of 14


Part Number HM1483
Description 3.1A Monolithic Step-Down Switching Regulator
Maker H&M semi
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