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DMS
DMS


D1067

monolithic step-down switch mode converter



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D1067 pdf
D1067
DESCRIPTION
The DMS1067 is a monolithic step-down switch
mode converter with a built in internal power
MOSFET. It achieves 2A continuous output cur-
rent over a wide input supply range with excel-
lent load and line regulation.
The DMS1067 requires a minimum number of
readily available standard external components.
Current mode operation provides fast transient
response and eases loop stabilization.
Fault condition protection includes cycle-by-
cycle current limiting and thermal shutdown. In
shutdown mode the regulator draws 25µA of
supply current.
FEATURES
2A Output Current
0.22Internal Power MOSFET Switch
Stable with Low ESR Output Ceramic Ca-
pacitors
Up to 95% Efficiency
25µA Shutdown Mode
Fixed 420KHz Frequency
Thermal Shutdown
Cycle-by-Cycle Over Current Protection
Wide 4.75 to 25V Operating Input Range
Output Adjustable from 1.22V to 21V
Programmable Under Voltage Lockout
APPLICATIONS
Distributed Power Systems
Battery Chargers
Pre-Regulator for Linear Regulators
PC Monitors
4.75 to 25
DMS1067
PACKAGE REFERENCE
Part number
DMS1067S
DMS1067P
Package
SOIC8
PDIP8
Temperature
–40°C to +125°C
–40°C to +125°C
REV:A2FYJ 2011-01-01
1
DMS Microelectronic Limited



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D1067 pdf
TM
ABSOLUTE MAXIMUM RATINGS (1)
Supply Voltage (VIN)..................................... 27V
Switch Voltage (VSW)................ –1V to VIN + 1V
Bootstrap Voltage (VBS) ...Vsw-0.3V to VSW + 6V
Enable/UVLO Voltage (VEN)...........–0.3V to +6V
Comp Voltage (VCOMP) ...................–0.3V to +6V
Feedback Voltage (VFB) ................–0.3V to +6V
Junction Temperature ........................... +150°C
Lead Temperature ................................. +260°C
Storage Temperature.............. –65°C to +150°C
D1067
Recommended Operating Conditions(2)
Input Voltage (VIN) ......................... 4.75V to 25V
Operating Temperature...............–40°C to +125°C
Thermal Resistance(3) θJA θJC
SOIC8 .................................... 105..... 50... °C/W
PDIP8 ...................................... 95…...55.. °C/W
Notes:
1) Exceeding these ratings may damage the device.
2) The device is not guaranteed to function outside of its
operating conditions.
3) Measured on approximately 1” square of 1 oz copper.
ELECTRICAL CHARACTERISTICS
VIN = 12V, VEN = 5V,TA = +25°C, unless otherwise noted.
Parameter
Condition
Feedback Voltage
Upper Switch-On Resistance
4.75V VIN 25V
Lower Switch-On Resistance
Upper Switch Leakage
Current Limit
VEN = 0V, VSW = 0V
Oscillator Frequency
Short Circuit Frequency
Maximum Duty Cycle
Minimum Duty Cycle
EN Shutdown Threshold Voltage
EN UVLO Threshold Rising
EN UVLO Threshold Hysteresis
Enable Pull-Up Current
Supply Current (Shutdown)
Supply Current (Quiescent)
Thermal Shutdown
VFB = 0V
VFB = 1.0V
VFB = 1.5V
ICC > 100µA
VEN Rising
VEN = 0V
VEN 0.4V
VEN 2.6V, VFB = 1.4V
Min
1.184
2.4
370
2.0
2.0
Typ
1.222
0.22
10
3.1
420
42
90
2.3
2.5
200
2
25
1.0
160
Max
1.258
10
470
0
2.5
3.0
50
1.5
Units
V
µA
A
KHz
KHz
%
%
V
V
mV
µA
µA
mA
°C
REV:A2FYJ 2011-01-01
2
DMS Microelectronic Limited



Part Number D1067
Description monolithic step-down switch mode converter
Maker DMS - DMS
Total Page 9 Pages
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