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WD1012EA-5 PDF даташит

Спецификация WD1012EA-5 изготовлена ​​​​«WillSEMI» и имеет функцию, называемую «600mA Synchronous Step-Down Regulator».

Детали детали

Номер произв WD1012EA-5
Описание 600mA Synchronous Step-Down Regulator
Производители WillSEMI
логотип WillSEMI логотип 

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WD1012EA-5 Даташит, Описание, Даташиты
WD1012EA-5/TR
1.5MHz, 600mA Synchronous Step-Down Regulator in SOT
General Description
The WD1012EA is a high efficiency monolithic synchronous buck
regulator using a constant frequency, current mode architecture.
The 2.7V to 5.5V input voltage range makes the WD1012EA ideally
suited for single Li-Ion battery-powered applications. Supply
current with no load is 22ȝA, dropping to <1ȝA in shut-
down. PWM (Pulse Width Modulation) operation provides very low
output ripple voltage for noise sensitive applications. 100% duty
cycle capability provides low dropout operation, extending battery
life in portable systems.
The switching frequency is internally set at 1.5MHz, allowing the
use of tiny surface mount inductors and capacitors. Low output
voltages are easily supported with the 0.6V feedback reference
voltage. The WD1012EA is available in SOT23 package. The
internal synchronous switch increases efficiency and eliminates
the need for an external Schottky diode.
Ordering Information
Top View
ORDER PART
NUMBER
WD1012EA-5/TR
PART MARKING
WD12
YYWW
Typical Application Circuit
Features
Ƶ 600mA Output Current
Ƶ High Efficiency: Up to 95%
Ƶ Tiny 5-Pin SOT23 Package
Ƶ 1.5MHz Constant Frequency Operation
Ƶ 2.7V to 5.5V Input Voltage Range
Ƶ Low Dropout Operation: 100% Duty Cycle
Ƶ Low Quiescent Current: Only 22ȝA During Operation
Ƶ Shutdown Mode Draws < 1ȝA Supply Current
Ƶ No Schottky Diode Required
Ƶ 0.6V Reference Allows Low Output Voltages
Ƶ Overtemperature Protected
Ƶ Adjustable Output Voltage.
Ƶ Current Mode Operation for Excellent Line and Load Transient
Response
Applications
Ƶ Cellular Telephones
Ƶ Personal Information Appliances
Ƶ Wireless and DSL Modems
Ƶ Digital Still Cameras
Ƶ MP3 Players
Ƶ Portable Instruments
Marking Information
Device
Package
WD1012EA-5/TR SOT23-5
Shipping
3000/Tape&Reel
For marking information, contact our sales representative directly
or through a willsemi distributor located in your area, otherwise
visit our website for detail.
1.2V
http://www.willsemi.com
330K
330K
Figure 1. High Efficient Step-Down Converter
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WD1012EA-5 Даташит, Описание, Даташиты
WD1012EA-5/TR
Absolute Maximum Ratings (Note 1)
z Input Supply Voltage ....................................................................................................................................................... – 0.3V to 6V
z EN, FB Voltages ............................................................................................................................................................. – 0.3V to VIN
z SW Voltage (DC) .............................................................................................................................................. – 0.3V to (VIN + 0.3V)
z P-Channel Switch Source Current (DC) .................................................................................................................................... 800mA
z N-Channel Switch Sink Current (DC) ....................................................................................................................................... 800mA
z Peak SW Sink and Source Current ................................................................................................................................................. 1.1A
z Operating Temperature Range (Note 2) ..................................................................................................................... –40eC to 85eC
z Maximum Junction Temperature (Notes 4) ........................................................................................................................... 125eC
z Storage Temperature Range .................................................................................................................................... – 65eC to 150eC
z Lead Temperature (Soldering, 10 sec)........................................................................................................................................ 300eC
Electrical Characteristics
(VIN = 3.6V, VEN = VIN, TA = 0ć to 85ć. Typical parameters are at TA = +25ć, unless otherwise noted.)
PARAMETER
SYMBOL CONDITIONS
MIN TYP
MAX
Input Voltage Range
Under Voltage Lockout Threshold
Operating Supply Current
VIN
VUVLO
IQ
VIN rising, hysteresis = 0.1V
(Note 3)VFB = 60%, IOUT = 0A
2.7
2.25
5.5
2.40 2.60
150 250
Standby Supply Current
IQ (Note 3)VFB = 105%, IOUT = 0A
22 30
Shutdown Supply Current
Adjustable Version Regulation Voltage
Output Voltage Line Regulation
Output Voltage Load Regulation
Inductor Limit Current
Oscillator Frequency
RDS(ON) of P-Channel FET
RDS(ON) of N-Channel FET
Feedback Leakage Current
SW Leakage Current
EN Threshold Voltage
EN Leakage Current
IQ
VFB
ƸVOUT
VLOADREG
ILIM
fOSC
RPFET
RNFET
IFB
ILSW
VEN
IEN
VFB = 0V, IOUT = 0A
TA = 25ć
0ć ” TA ” 85ć
-40ć ” TA ” 85ć
VIN = 3V to 5V
IOUT = 10mA to 500mA
VIN = 3.6V, VOUT = 90%
of VOUT(NOM)
VFB or VOUT in regulation
VFB or VOUT to GND
ISW = 100mA
ISW = í100mA
VIN = 5.5V, VSW = 0V or 5.5V
VIN = 2.7 to 5.5V
VIN = 5.5V, VEN = 0V or VIN
0.584
0.582
0.580
0.7
1.2
230
0.4
0.1 1
0.6 0.616
0.6 0.618
0.6 0.620
0.016 0.4
0.5
0.9 1.1
1.5
280
0.37
0.36
±0.01
1
±0.01
1.8
330
0.6
0.6
±30
±0.1
1.4
±0.1
UNITS
V
V
ȝA
ȝA
ȝA
V
V
V
%/V
%
A
MHz
KHz
ȍ
ȍ
nA
ȝA
V
ȝA
http://www.willsemi.com
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J a n . 2012 Rev3.0









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WD1012EA-5 Даташит, Описание, Даташиты
WD1012EA-5/TR
Note1. Absolute Maximum Ratings are those values
beyond which the life of a device may be
impaired.
Note2. The WD1012EA is guaranteed to meet
performance specifications from 0ć to 70ć.
Specifications over the –40 ć to 85 ć
operating temperature range are assured by
design, characterization and correlation with
statistical process controls.
Note3. Dynamic supply current is higher due to the
gate charge being delivered at the switching
frequency.
Note4. This IC includes over temperature protection
that is intended to protect the device during
momentary overload conditions. Junction
temperature will exceed 125 ć when over
temperature protection is active. Continuous
operation above the specified maximum
operating junction temperature may impair
device reliability.
Pin Functions
VIN (Pin 1): Main Supply Pin. Must be closely deco-
upled to GND, Pin 2, with a 2.2ȝF or greater ceramic
capacitor.
GND (Pin 2): Ground Pin.
EN (Pin 3): Enable pin of the device. Pulling this pin to
ground forces the device into shutdown mode. Pulling
this pin to VIN enables the device. This pin must not be
left floating and must be terminated.
FB (Pin 4): Feedback pin of the device. Receives the
feedback voltage from an external resistive divider
across the output.
SW (Pin 5): Connect the inductor to this pin. This pin
is the switch pin and connected to the internal MOSFET
switches.
Typical Performance Characteristics
100
V =1.8V
OUT
90
V =2.7V
IN
80
V =4.2V
IN
V =3.6V
IN
70
60
0.1 1 10 100 1000
Output Current(mA)
Efficiency VS Output Current
95
90
V =1.2V
OUT
V =2.7V
IN
85
80
75
V =4.2V
IN
70
V =3.6V
IN
65
60
55
50
45
0.1
1 10 100 1000
Output Current(mA)
Efficiency VS Output Current
http://www.willsemi.com
Page 3
J a n . 2012 Rev3.0










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