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WD1012EA-5 데이터시트 PDF




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부품번호 WD1012EA-5 기능
기능 600mA Synchronous Step-Down Regulator
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WD1012EA-5 데이터시트, 핀배열, 회로
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
Page 1
J a n . 2012 Rev3.0




WD1012EA-5 pdf, 반도체, 판매, 대치품
100
V =1.8V
OUT
90
I =600mA
OUT
I =100mA
OUT
80 I =10mA
OUT
70 I =1mA
OUT
60
I =0.1mA
OUT
50
345
Input Voltage(v)
Efficiency VS Input Voltage
6
200
I =0mA,V =1.8V
OUT
OUT
150
V =0.5V
100 FB
50
V =0.7V
FB
0
345
Input Voltage(V)
6
Supply Current VS Input Voltage
WD1012EA-5/TR
1.7
I =600mA, V =1.8V
OUT
OUT
1.6
1.5
1.4
1.3
345
Input Voltage(V)
Frequency VS Input Voltage
6
Start-Up from Shutdown
Load Step
http://www.willsemi.com
Page 4
PSM Mode Operation
J a n . 2012 Rev3.0

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WD1012EA-5 전자부품, 판매, 대치품
WD1012EA-5/TR
voltage rating rather than capacitance value. Use the
following equation to calculate the maximum RMS
input current:
I RMS
IOUT
VIN
VOUT u VIN  VOUT
Output Capacitor Selection
Ceramic capacitors with low-ESR values have the
lowest output voltage ripple and are recommended. At
nominal load current, the device operates in PWM
mode, and the RMS ripple current is calculated as:
allowing remote voltage sensing as shown in Figure 2.
To minimize the current through the feedback divider
network, R1 should be larger than 100kȍ. The sum of
R1 and R2 should not exceed 1 Mȍ, to keep the
network robust against noise. An external feedforward
capacitor CFWD, is required for optimum load transient
response. The value of CFWD should be in the range
between 22pF and 33pF.
Route the FB line away from noise sources, such as the
inductor or the SW line.
I RMSCout
1 VOUT
VOUT u
VIN
Lu f
u1
2u 3
At nominal load current, the device operates in PWM
mode, and the overall output voltage ripple is the sum
of the voltage spike caused by the output capacitor ESR
plus the voltage ripple caused by charging and
discharging the output capacitor:
'V
VOUT
1  VOUT
u VIN
Lu f
u
§
¨
©
8
u
1
COUT
u
f

ESR
·
¸
¹
At light load currents, the converter operates in pulse
skipping mode, and the output voltage ripple is
dependent on the capacitor and inductor values. Larger
output capacitor and inductor values minimize the
voltage ripple in PSM operation and tighten dc output
accuracy in PSM operation.
Output Voltage Setting
The output voltage can be calculated as:
VOUT
0.6
§¨©1 
R2
R1
·
¹¸
The external resistive divider is connected to the output,
Figure 2. Setting the WD1012EA Output Voltage
PC Board Layout Considerations
A good circuit board layout aids in extracting the most
performance from the WD1012EA. Poor circuit layout
degrades the output ripple and the electromagnetic
interference (EMI) or electromagnetic compatibility
(EMC) performance.
The evaluation board layout is optimized for the
WD1012EA. Use this layout for best performance. If
this layout needs changing, use the following
guidelines:
1. Use separate analog and power ground planes.
Connect the sensitive analog circuitry (such as
voltage divider components) to analog ground;
connect the power components (such as input and
output bypass capacitors) to power ground. Connect
the two ground planes together near the load to
reduce the effects of voltage dropped on circuit
board traces.
2. Locate CIN as close to the VIN pin as possible, and
use separate input bypass capacitors for the analog
and power grounds indicated in Guideline 1.
http://www.willsemi.com
Page 7
J a n . 2012 Rev3.0

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부품번호상세설명 및 기능제조사
WD1012EA-5

600mA Synchronous Step-Down Regulator

WillSEMI
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