AP2014AS [DIODES]
Switching Regulator/Controller, Voltage-mode, 460kHz Switching Freq-Max, PDSO8,;
| 型号： | AP2014AS |
| 厂家： | 
DIODES INCORPORATED |
| 描述： | Switching Regulator/Controller, Voltage-mode, 460kHz Switching Freq-Max, PDSO8, 控制器 |
| 文件： | 总13页 (文件大小：406K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AP2014/A
SYNCHRONOUS PWM DC-DC BUCK CONTROLLER
General Description
Features
The AP2014 PWM DC-DC controller IC is designed to provide a
low cost synchronous Buck regulator for on-board DC to DC
converter applications. With the migration of today’s ASIC
products requiring low supply voltages such as 1.8V and lower,
together with currents in excess of 3A, traditional linear regulators
are simply too lossy to be used when input supply is 5V or even
in some cases with 3.3V input supply. The AP2014 together with
dual N-channel MOSFETs such as AF9410, provide a low cost
solution for such applications. This device features an internal
200KHz oscillator (400KHz for "A" version), under-voltage
lockout for both Vcc and Vc supplies, an external programmable
soft-start function as well as output under-voltage detection that
latches off the device when an output short is detected.
•
Synchronous PWM DC-DC Controller in an 8-Pin
Package
•
•
•
•
•
•
•
Operating with single 5V or 12V supply voltage
Internal 200KHz Oscillator (400KHz for AP2014A)
Soft-Start Function
Fixed Frequency Voltage Mode
500mA Peak Output Drive Capability
Output protected when control FET is shorted
SOP-8L Pb-Free and Green (under development)
packages
Applications
•
•
•
•
Graphic Card
Hard Disk Drive
DDR memory source sink Vtt application
Low cost on-board DC to DC such as 5V to 3.3V, 2.5V or 1.8V
Pin Assignments
(Top View)
1
2
8 SS
FB
Vcc
Comp
7
6
AP2014/A
SOP-8L
LDrv 3
GND
Vc
HDrv
4
5
DS30883 Rev. 1 - 0
1 of 13
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AP2014/A
© Diodes Incorporated
AP2014/A
SYNCHRONOUS PWM DC-DC BUCK CONTROLLER
Ordering Information
2014A X X X
AP
Lead-Free
Frequency
Packing
Package
Blank : Lead-Free
G : Green
Blank : Tube or bulk
-7/-13 : Taping
Blank : 200KHz
A : 400KHz
SM: SOP-8L
7” Tape and Reel
13” Tape and Reel
Package
Code
Device
Packaging
Quantity
Part Number
Quantity
Part Number
Suffix
Suffix
10,000/Tape &
Reel
10,000/Tape &
Reel
AP2014SM
SM
SM
SOP-8L
SOP-8L
3000/Tape & Reel
3000/Tape & Reel
-7
-13
-13
AP2014ASM
-7
Pin Descriptions
Pin
Name No.
Pin
Description
This pin is connected directly to the output of the switching regulator via resistor divider to
provide feedback to the Error amplifier.
FB
1
This pin provides biasing for the internal blocks of the IC as well as power for the low side
driver. A minimum of 1uF, high frequency capacitor must be connected from this pin to
ground to provide peak drive current capability.
Vcc
LDrv
GND
HDrv
2
3
4
5
Output driver for the synchronous power MOSFET.
This pin serves as the ground pin and must be connected directly to the ground plane. A
high frequency capacitor (0.1 to 1uF) must be connected from V5 and V12 pins to this pin
for noise free operation.
Output driver for the high side power MOSFET.
This pin is connected to a voltage that must be at least 4V higher than the bus voltage of the
switcher (assuming 5V threshold MOSFET) and powers the high side output driver. A
minimum of 1uF, high frequency capacitor must be connected from this pin to ground to
provide peak drive current capability.
Compensation pin of the error amplifier. An external resistor and capacitor network is
typically connected from this pin to ground to provide loop compensation.
This pin provides soft-start for the switching regulator. An internal current source charges
an external capacitor that is connected from this pin to ground which ramps up the output of
the switching regulator, preventing it from overshooting as well as limiting the input current.
The converter can be shutdown by pulling this pin below 0.5V.
Vc
Comp
SS
6
7
8
DS30883 Rev. 1 - 0
2 of 13
AP2014/A
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AP2014/A
SYNCHRONOUS PWM DC-DC BUCK CONTROLLER
Block Diagram
Vc
6
3V
FbLo Comp
-
20uA
0.5V
+
POR
SS
8
64uA
Max
POR
Ct
Oscillator
Error Comp
5
HDrv
1.25V
25K
S
R
Error Amp
+
Q
2
3
+
Vcc
-
25K
Reset Dom
Fb
1
7
-
LDrv
Comp
Bias
Generator
3V
1.25V
Vcc
0.2V
0.2V
+
POR
-
4.0V
Vc
+
-
3.5V
4
GND
Absolute Maximum Ratings
Symbol
VCC
VC
Parameter
Vcc Supply Voltage
Range.
Unit
V
20
32
Vc Supply Voltage (not rated for inductive load)
Storage Temperature Range
V
oC
oC
oC/W
oC/W
TST
-65 to 150
0 to 125
90
TJ
Operating Junction Temperature Range
Thermal Resistance Junction to Case
Thermal Resistance Junction to Ambient
θJC
θJA
250
DS30883 Rev. 1 - 0
3 of 13
AP2014/A
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AP2014/A
SYNCHRONOUS PWM DC-DC BUCK CONTROLLER
Electrical Characteristics
Unless otherwise specified, these specifications apply over VCC=5V, VC=12V and TA=0 to 70°C. Typical values refer to TA =25°C. Low
duty cycle pulse testing is used which keeps junction and case temperatures equal to the ambient temperature.
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Unit
Reference Voltage
AP2014
AP2014A
5 < Vcc < 12
1.225
0.784
-
1.25
0.8
0.2
1.275
0.816
0.35
VFB
FB Voltage
V
LREG
FB Voltage Line Regulation
%
UVLO
UVLO Threshold - VCC
UVLO Hysteresis - VCC
UVLO Threshold - VC
UVLO Hysteresis - VC
4.0
-
3.1
-
4.2
0.25
3.3
4.4
-
3.5
-
V
V
V
V
UVLO VCC
UVLO VC
Supply Ramping Up
Supply Ramping Up
0.2
FB Ramping Down
(AP2014)
FB Ramping Down
(AP2014A)
0.4
0.6
0.8
V
UVLO Threshold - FB
UVLO Hysteresis - FB
UVLO FB
0.3
-
0.4
0.1
0.5
-
V
V
Supply Current
Freq=200KHz,
CL=1500pF
Freq=200KHz,
CL=1500pF
SS=0V
Operation ICC VCC Operation Supply Current
Operation IC VC Operation Supply Current
-
-
7
7
10
10
mA
mA
ICCQ
ICQ
VCC Static Supply Current
VC Static Supply Current
-
-
3.3
1
6
4.5
mA
mA
SS=0V
Soft-Start Section
SSIB
Error Amp
IFB1
Charge Current
SS=0V
10
20
30
µA
FB Voltage Input Bias Current SS=3V, FB=1V
FB Voltage Input Bias Current SS=0V, FB=1V
Transconductance
-
-
-0.1
-64
600
-
-
µA
µA
µmho
IFB2
gm
450
750
Oscillator
AP2014
170
340
1.225
200
400
1.25
230
460
1.275
KHz
KHz
V
Freq
Frequency
AP2014A
Ramp-Amplitude Voltage
VRAMP
Output Drivers
Tr
Tf
TDB
TON
TOFF
Rise Time
Fall Time
Dead Band Time
Max Duty Cycle
Min Duty Cycle
CL =1500pF
CL =1500pF
-
-
50
85
0
50
50
150
90
0
100
100
250
95
ns
ns
ns
%
FB=1V, Freq=200KHz
FB=1.5V
-
%
Function Description
DS30883 Rev. 1 - 0
4 of 13
AP2014/A
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AP2014/A
SYNCHRONOUS PWM DC-DC BUCK CONTROLLER
Introduction
The outputs are protected against the short circuit. The AP2014
The AP2014 is a fixed frequency, voltage mode synchronous
controller and consists of a precision reference voltage, an error
amplifier, an internal oscillator, a PWM comparator, 0.5A peak
gate driver, soft-start and shutdown circuits (see Block Diagram).
protects the circuit for shorted output by sensing the output
voltage (through the external resistor divider). The AP2014 shuts
down the PWM signals, when the output voltage drops below
0.6V (0.4V for AP2014A).
The output voltage of the synchronous converter is set and
controlled by the output of the error amplifier; this is the amplified
error signal from the sensed output voltage and the reference
voltage.
The AP2014 also protects the output from over-voltaging when
the control FET is shorted. This is done by turning on the sync
FET with the maximum duty cycle.
Under-Voltage Lockout
This voltage is compared to a fixed frequency linear sawtooth
ramp and generates fixed frequency pulses of variable duty-cycle,
which drives the two N-channel external MOSFETs.The timing of
the IC is provided through an internal oscillator circuit which uses
on-chip capacitor to set the oscillation frequency to 200 KHz (400
KHz for “A” version).
The under-voltage lockout circuit assures that the MOSFET
driver outputs remain in the off state whenever the supply voltage
drops below set parameters. Lockout occurs if VC and VCC fall
below 3.3V and 4.2V respectively. Normal operation resumes
once VC and VCC rise above the set values.
Soft-Start
IC Quiescent Power Dissipation
The AP2014 has a programmable soft-start to control the output
voltage rise and limit the current surge at the start-up. To ensure
correct start-up, the soft-start sequence initiates when the VC and
VCC rise above their threshold (3.3V and 4.2V respectively) and
generates the Power On Reset (POR) signal. Soft-start function
operates by sourcing an internal current to charge an external
capacitor to about 3V. Initially, the soft-start function clamps the
E/A’s output of the PWM converter. As the charging voltage of
the external capacitor ramps up, the PWM signals increase from
zero to the point the feedback loop takes control.
Power dissipation for PWM DC-DC controller IC is a function of
applied voltage, gate driver loads and switching frequency. The
IC's maximum power dissipation occurs when the IC operating
with single 12V supply voltage (Vcc=12V and Vc≅24V) at 400KHz
switching frequency and maximum gate loads. Page 8 show
voltage vs. current, when the gate drivers loaded with 1500pF
capacitors. The IC's power dissipation results to an excessive
temperature rise. This should be considered when using
AP2014A for such application.
Typical Application Circuit
DS30883 Rev. 1 - 0
5 of 13
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AP2014/A
© Diodes Incorporated
AP2014/A
SYNCHRONOUS PWM DC-DC BUCK CONTROLLER
(1)
VIN=5V
Vc=12V
C8
C11
0.1u
470u
C3
1u
R3
8.2
C4
0.1u
R1
820
U1
FB
1
2
3
4
8
7
6
5
SS
Q1
R2
3.3K
Vcc Comp
AF9410N
Vc
LDrv
GND HDrv
L1
5.6u/9.0
Vout +1.5V/7.0A
C5
C6
10nF
AP2014
0.47u
Q2
AF9410N
C12
C13
470u
C17
0.1u
R6
22k
C20
100p
470u
(2)
VIN=12V
D2
1N4148
D1
C1
0.1uF
C8
470u
C11
0.1u
1N4148
C4
0.1u
R1
820
R3
8.2
U1
FB
1
2
3
4
8
7
6
5
SS
R2
C3
Q1
AF9410N
Vcc Comp
3.3K
100u
Vc
LDrv
GND HDrv
L1
5.6u/9A
Vout +1.5V/7.0A
AP2014
C6
10nF
C5
0.47u
Q2
AF9410N
C12
C13
C17
0.1u
R6
6.8k
C20
470u 470u
100p
Option
Single Supply 12V Input
Typical Application Circuit (Continued)
DS30883 Rev. 1 - 0
6 of 13
AP2014/A
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AP2014/A
SYNCHRONOUS PWM DC-DC BUCK CONTROLLER
(3)
VIN=12V
D2
1N4148
C1
0.1uF
D1
C8
C11
0.1u
470u
1N4148
C4
0.1u
R1
10K
R3
8.2
U1
1
2
3
4
8
7
6
5
FB
SS
R2
3K
C3
100u
Q1
AF4910N-1
Vcc
Comp
Vc
LDrv
GND HDrv
L1
10uH/6A
Vout +5V/5.0A
AP2014
C6
10nF
C5
0.47u
Q2
AF4910N-2
C13
C17
0.1u
R6
39k
C20
100p
470u
Single Supply 12V Input
(4)
VIN=24V
RZD
1.2K
C1
0.1uF
D1
C8
C11
0.1u
470u
1N4148
D2
1N4148
C4
0.1u
R1
10K
R3
8.2
U1
FB
1
2
3
4
8
7
6
5
SS
R2
3.3K
Q1-1
Vcc Comp
AF4928N-1
Vc
LDrv
GND HDrv
R3
8.2
L1
10uH/6A
Vout +5V/4.0A
AP2014
C6
10nF
C5
0.47u
ZD
6.2V
C3
100u
Q1-2
AF4928N-2
C13
470u
C17
0.1u
R6
47k
C20
100p
IZD(≧15mA)=(VIN-VD2-VZD)/RZD
Single Supply 24V Input
Typical Application Circuit (Continued)
DS30883 Rev. 1 - 0
7 of 13
AP2014/A
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AP2014/A
SYNCHRONOUS PWM DC-DC BUCK CONTROLLER
(5) Dual Supply, 5V Bus and 12V Bias Input
5V
L1
12V
1uH
+
+
C4
C3
47uF
C1
100uF
C1
0.1uF
1uF
1.8V/1A
C5
47uF
2.5V/2A
AP1187
Vcc
Vc
+
Q1
HDrv
AF9410
L2
AP2014
10uH
Q2
AF9410
+
C6
220uF
C8
10nF
Comp
SS
LDrv
R1
3.3K
Fb
R3
1K
GND
R2
1K
C7
0.1uF
+
C10
1uF
C9
0.1uF
C11
Vcc
Vc
Q3
AF9410
HDrv
L3
AP2014
3.3V/1.8A
10uH
+
C14
10nF
LDrv
Comp
Q4
AF9410
C12
220uF
R4
3.3K
Fb
R6
1.65K
SS GND
R5
1K
C13
0.1uF
Dual Supply, 5V Bus and 12V Bias Input
Typical Performance Characteristics
DS30883 Rev. 1 - 0
8 of 13
AP2014/A
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AP2014/A
SYNCHRONOUS PWM DC-DC BUCK CONTROLLER
Efficiency vs. Iout
Load Regulation
100%
2.0%
1.8%
1.6%
1.4%
1.2%
1.0%
0.8%
0.6%
0.4%
0.2%
0.0%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
0.0 0.5 1.0 3.0 5.0 8.0 10.0 12.0 15.0
Iout(A)
0.0 0.5 1.0 3.0 5.0 8.0 10.0 12.0 15.0
Iout(A)
Line Regulation
Line Regulation
1.260
1.255
1.250
1.245
1.240
2.530
2.525
2.520
2.515
2.510
2.505
2.500
4.5 5.0 7.0 9.0 11.0 12.0 15.0
Vin(V)
4.5
5.0 7.0
9.0 11.0 12.0 15.0
Vin(V)
Frequency v.s. Temperature
Frequency v.s. Vin
240.0
230.0
220.0
210.0
200.0
190.0
180.0
170.0
160.0
150.0
210.0
205.0
200.0
195.0
190.0
185.0
180.0
175.0
4.5 5.0 7.0 9.0 11.0 12.0 15.0
Vin(V)
-40 -20
0
25 50 75 100 125
Temperature (oC)
Typical Performance Characteristics (Continued)
DS30883 Rev. 1 - 0
9 of 13
AP2014/A
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AP2014/A
SYNCHRONOUS PWM DC-DC BUCK CONTROLLER
Icc and Iccq vs. Vin
Ic and Icq vs. Vin
16.00
15.00
13.00
11.00
9.00
14.00
12.00
10.00
8.00
6.00
4.00
2.00
Icc(mA)
Ic(mA)
Iccq(mA)
Icq(mA)
7.00
5.00
3.00
4.5
5
7
9
11
12
15
4.5
5
7
9
11
12
15
Vin(V)
Vin(V)
Icc and Ic vs. Temperature
Vfb vs. Temperature
10.0
1.30
1.28
1.26
1.24
1.22
1.20
Icc(mA)
9.5
9.0
8.5
8.0
7.5
7.0
6.5
6.0
Ic(mA)
-40 -20
0
25
50
75 100 125
-40 -20
0
25 50 75 100 125
Temperature (oC)
Temperature (oC)
AP2014 Ic and Icc vs Vc
AP2014A Ic and Icc vs Vc
20.0
18.0
16.0
14.0
12.0
10.0
8.0
21.0
19.0
17.0
15.0
13.0
11.0
9.0
Ic(mA)
Ic(mA)
Icc(mA)
Icc(mA)
6.0
7.0
4.0
5.0
2.0
3.0
6
8
10 12 14 16 18 20 22 24
Vc(V)
6
8
10 12 14 16 18 20 22 24
Vc(V)
Typical Performance Characteristics (Continued)
DS30883 Rev. 1 - 0
10 of 13
AP2014/A
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AP2014/A
SYNCHRONOUS PWM DC-DC BUCK CONTROLLER
Vout Ripple
Vout Ripple
Vcc=5V; Vc=12V; Vout=2.5V
Iout=0.5A, Vripple=30.8mV
Vcc=5V; Vc=12V; Vout=2.5V
Iout=5A, Vripple=33.2mV
Dead time v.s. Iout
Vcc=5V, Vc=12V, Vout=2.5V, Iout=0.5A, Temp=28oC
Dead time = 150ns
Dead time = 150ns
Phase
Highside GATE
Lowside GATE
Dead time v.s. Iout
Vcc=5V, Vc=12V, Vout=2.5V, Iout=5A , Temp=28oC
Dead time = 160ns Dead time = 150ns
Phase
Highside GATE
Lowside GATE
Marking Information
DS30883 Rev. 1 - 0
11 of 13
AP2014/A
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© Diodes Incorporated
AP2014/A
SYNCHRONOUS PWM DC-DC BUCK CONTROLLER
(1) SOP-8L
(Top view)
Logo
AP2014(A)
Y WW
Part Number
Blank : Lead Free
G : Green
X
WW: Nth week
Y: Year
Marking Code Table
Device
AP2014
AP2014A
Package
SOP-8L
SOP-8L
Marking Code
AP2014
Date Code
YWW
AP2014A
YWW
Date Code Key
Year
2006
2007
2008 2009 2010 2011
2012 2013 2014 2015 2016 2017
Code
T
U
V
W
X
Y
Z
A
B
C
D
E
Package Information (All Dimensions in mm)
Package Type: SOP-8L
DS30883 Rev. 1 - 0
12 of 13
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AP2014/A
© Diodes Incorporated
AP2014/A
SYNCHRONOUS PWM DC-DC BUCK CONTROLLER
8X .06
8X 2.2
8
1
5
4
5.2
5.90/6.10
Typ 6.00
6X 1.27
RECOMMENDED LAND PATTERN
0.30/0.50
Typ 0.40
3.80/3.90
Typ 3.85
0.60/0.70
Typ 0.65
0.35
7°
0.15/0.25
Typ 0.20
1.40/1.50
Typ 1.45
0.08/0.25
Typ 0.15
3.85/3.95
Typ 3.90
1.27
4.85/4.95
Typ 4.90
DS30883 Rev. 1 - 0
13 of 13
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AP2014/A
© Diodes Incorporated
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