DMS ELECTRONIC COMPONENTS
EDS-parameters
DMS1506
150KHz, 3A PWM Buck DC/DC Converter
General Description
The DMS1506 series are monolithic IC designed for a
step-down DC/DC converter, and own the ability of
driving a 3A load without external transistor. Due to
reducing the number of external component, the
board space can be saved easily. The external
shutdown function can be controlled by logic level
and then come into standby mode. The internal
compensation makes feedback control have good
line and load regulation without external design.
Regarding protected function, thermal shutdown is
to prevent over temperature operating from damage,
and current limit is to prevent over current operating
of the output switch. If current limit function
occurred and VFB is down to 0.5V below, the
switching frequency will be reduced. The DMS1506
series operate at a switching frequency of 150KHz
thus allowing smaller sized filter components than
what would be needed with lower frequency
switching regulators. Other features include a
guaranteed +4% tolerance on output voltage under
specified input voltage and output load conditions,
and +15% on the oscillator frequency. The output
version included fixed 3.3V, 5V, 12V, and an
adjustable type. The packages are available in a
standard 5-lead TO-220, a 5-lead TO-263 or 8-lead
PDIP.
Features
- Output voltage: 3.3V, 5V, 12V and adjustable
output version
- Adjustable version output voltage range, 1.23V to
18V+4%
- 150KHz +15% fixed switching frequency
- Voltage mode non-synchronous PWM control
- Thermal-shutdown and current-limit protection
- ON/OFF shutdown control input
- Operating voltage can be up to 22V
- Output load current: 3A
- TO220-5L, TO263-5L and PDIP-8 packages
- Low power standby mode
- Built-in switching transistor on chip
Applications
- Simple High-efficiency step-down regulator
- On-card switching regulators
- Positive to negative converter
DMS ELECTRONIC COMPONENTS
EDS-parameters
Electrical Characteristics (All Output Voltage Versions)
Unless otherwise specified, VIN=12V for 3.3V, 5V, adjustable version and VIN=18V for the 12V version.
ILOAD = 0.5A
Symbol
IFB
FOSC
FSCP
VSAT
Parameter
Feedback Bias
Current
Oscillator
Frequency
Oscillator Fre-
quency of Short
Circuit Protect
Saturation Voltage
Max. Duty Cycle
(ON)
Min. Duty Cycle
(OFF)
Current
Limit
Output
Output
Leakage
= 0V
Current
Output
=-1V
Quiescent Current
Standby Quiescent
Current
ON /OFF Pin Logic
Input Threshold
Voltage
ON /OFF Pin Logic
Input Current
ON /OFF Pin Input
Current
Thermal Resistance
Junction to Case
Thermal Resistance
Junction to Ambient
Conditions
VFB=1.3V (Adjustable ver-
sion only)
127
110
When current limit occurred
and VFB< 0.5V, Ta=25
o
C
IOUT=3A No outside circuit
VFB=0V force driver on
VFB=0V force driver on
VFB=12V force driver off
Peak current No outside cir-
cuit VFB=0 force driver on
No outside circuit VFB=12
force driver off
VIN=22V
VFB=12 force driver off
ON /OFF pin=5V VIN=22V
Low (regulator ON)
High
(regulator OFF)
3.6
10
Min.
Typ.
-10
150
Max.
-50
-100
173
173
50
1.6
1.7
Unit
nA
KHz
KHz
V
30
1.4
100
0
4.5
DC
%
5.5
6.5
-200
ICL
A
uA
mA
IL
IQ
ISTBY
VIL
VIH
IH
IL
θJC
-5
5
70
-
2.0
1.3
10
150
200
0.6
-
-0.01
mA
uA
V
VLOGIC=2.5V (OFF)
VLOGIC =0.5V (ON)
TO220-5L
TO263-5L
PDIP-8L
TO220-5L
TO263-5L
PDIP-8L
uA
-0.1
2.5
3.5
12
28
23
35
-1
o
C/W
θJA
with copper
area of ap-
proximately 3
in
2
o
C/W
Specifications with
boldface type
are for full operating temperature range, the other type are for
TJ=25ºC.
DMS ELECTRONIC COMPONENTS
Typical Performance Characteristics
DMS1506 Efficiency v.s. Temperature
(Vin=12V,Vout=5V,Io=3A)
EDS-parameters
DMS1506 Efficiency v.s. Temperature
(Vin=12V,Vout=3.3V,Io=3A)
DMS1506 Saturation Voltage v.s. Temperature
(Vcc=12V,Vfb=0V,VSD=0)
DMS1506 Switch Current Limit v.s. Temperature
(Vcc=12V,Vfb=0V)
DMS1506 Supply Current v.s. Temperature
(Vcc=12V , No Load ,Von/off =0V(Switch ON) ,Von/off =5V(Switch OFF))
Microcontroller MCU
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