D1067 PDF даташит
Спецификация D1067 изготовлена «DMS» и имеет функцию, называемую «monolithic step-down switch mode converter». |
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Детали детали
Номер произв | D1067 |
Описание | monolithic step-down switch mode converter |
Производители | DMS |
логотип |
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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
• 0.22Ω Internal 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
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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
Ω
Ω
µA
A
KHz
KHz
%
%
V
V
mV
µA
µA
mA
°C
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D1067
PIN FUNCTIONS
Pin # Name Description
High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-channel
1 BS MOSFET switch. Connect a 10nF or greater capacitor from SW to BS to power the
switch.
Power Input. IN supplies the power to the IC, as well as the step-down converter switch.
2 IN Drive In with a 4.75 to 25V power source. Bypass IN to GND with a suitably large capaci-
tor to eliminate noise on the input to the IC. See Input Capacitor.
3 SW Power Switching Output. SW is the switching node that supplies power to the output.
Connect the output LC filter from SW to the output load. Note that a capacitor is required
from SW to BS to power the high-side switch.
4 GND Ground.
5 FB Feedback Input. FB senses the output voltage to regulate that voltage. Drive FB with a
resistive voltage divider from the output voltage. The feedback threshold is 1.222V. See
Setting the Output Voltage.
6 COMP Compensation Node. COMP is used to compensate the regulation control loop. Connect
a series RC network from COMP to GND to compensate the regulation control loop. See
Compensation.
7 EN 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. For automatic startup, leave EN unconnected.
8 NC No Connect.
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