AP2014AS [ICT]
Switching Controller, Voltage-mode, 0.5A, 460kHz Switching Freq-Max, PDSO8, LEAD FREE, SOP-8;
| 型号： | AP2014AS |
| 厂家： | 
InnoChips Technology |
| 描述： | Switching Controller, Voltage-mode, 0.5A, 460kHz Switching Freq-Max, PDSO8, LEAD FREE, SOP-8 光电二极管 |
| 文件： | 总11页 (文件大小：265K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AP2014/A
Synchronous PWM Controller
Features
General Description
- Synchronous Controller in 8-Pin Package
- Operating with single 5V or 12V supply voltage
- Internal 200KHz Oscillator (400KHz for AP2014A)
- Soft-Start Function
The AP2014 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.
- Fixed Frequency Voltage Mode
- 500mA Peak Output Drive Capability
- Protects the output when control FET is shorted
- SOP-8L/PDIP-8L Pb-Free package
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
Pin Descriptions
Pin
Pin
No.
Description
Name
This pin is connected directly to the output of the
switching regulator via resistor divider to provide
feedback to the Error amplifier.
(Top View)
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 1F, high frequency capacitor must be
connected from this pin to ground to provide peak
drive current capability.
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 1F) 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 1F, 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.
1
2
3
4
8
7
6
5
SS
Comp
Vc
FB
Vcc
LDrv
GND
Vcc
LDrv
GND
HDrv
2
3
4
5
AP2014/A
HDrv
SOP-8L/PDIP-8L
Vc
Comp
SS
6
7
8
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.
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this
product. No rights under any patent accompany the sale of the product.
Rev. 1.1 Jul 5, 2005
1/11
AP2014/A
Synchronous PWM Controller
Ordering Information
AP2014/A
Package
Packing
S: SOP-8L
N: PDIP-8L
Blank : Tube
A : Taping
Block Diagram
Vc
6
3V
FbLo Comp
-
20uA
0.5V
+
POR
SS
8
64uA
Max
POR
Ct
Oscillator
5
HDrv
1.25V
25K
S
R
Error Comp
Error Amp
+
+
Q
2
3
Vcc
-
25K
Reset Dom
Fb
1
7
-
LDrv
Comp
Bias
Generator
3V
Vcc
1.25V
0.2V
0.2V
+
POR
-
4.0V
Vc
+
-
3.5V
4
GND
Absolute Maximum Ratings
Symbol
VCC
VC
Parameter
Vcc Supply Voltage
Vc Supply Voltage (not rated for inductive load)
Storage Temperature Range
Range.
Unit
V
20
30
V
TST
TJ
-65 to 150
0 to 125
oC
oC
Operating Junction Temperature Range
Anachip Corp
www.anachip.com.tw
Rev. 1.1 Jul 5, 2005
2/11
AP2014/A
Synchronous PWM 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
1.225
0.784
-
1.25
0.8
1.275
0.816
0.35
VFB
FB Voltage
V
AP2014A
LREG
FB Voltage Line Regulation
5 < Vcc < 12
0.2
%
UVLO
UVLO Threshold - VCC
UVLO Hysteresis - VCC
UVLO Threshold - VC
UVLO Hysteresis - VC
4.0
-
4.2
0.25
3.3
4.4
-
V
V
V
V
UVLO VCC
Supply Ramping Up
Supply Ramping Up
3.1
-
3.5
-
UVLO VC
0.2
FB Ramping Down
(AP2014)
0.4
0.6
0.8
V
UVLO Threshold - FB
UVLO Hysteresis - FB
UVLO FB
FB Ramping Down
(AP2014A)
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
-
-
7
7
10
10
mA
mA
Operation IC VC Operation Supply Current
ICCQ
ICQ
VCC Static Supply Current
VC Static Supply Current
-
-
3.3
1
6
mA
mA
SS=0V
4.5
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
-
-
µA
µA
IFB2
gm
450
600
750
µmho
Oscillator
AP2014
170
340
200
400
1.25
230
460
KHz
KHz
V
Freq
Frequency
AP2014A
VRAMP
Ramp-Amplitude Voltage
1.225
1.275
Output Drivers
Tr
Tf
Rise Time
CL =1500pF
CL =1500pF
-
-
50
50
150
90
0
100
100
250
95
ns
ns
ns
%
Fall Time
TDB
TON
TOFF
Dead Band Time
Max Duty Cycle
Min Duty Cycle
50
85
0
FB=1V, Freq=200KHz
FB=1.5V
-
%
Anachip Corp
www.anachip.com.tw
Rev. 1.1 Jul 5, 2005
3/11
AP2014/A
Synchronous PWM Controller
Typical Application Circuit
(1)
5V
L1
C1
12V
1uH
+
+
0.1uF
+
C5
C6
100uF
C2
47uF
1uF
Vcc
Vc
Q1
AF9410
HDrv
L2
1.5V
AP2014
5.6uH
Comp
LDrv
Fb
C4
Q2
AF9410
C7
150uF
10nF
R1
3.3K
R2
R3
SS GND
1.24K
249
C3
0.1uF
(2)
12V
D2
1N4148
L1
D1
1uH
C1
100uF
+
+
C4
100uF
1N4148
C5
C3
0.1uF
Vcc
Vc
Q1
AF4910N-1
HDrv
L2
AP2014
5V
10uH
+
Q2
AF4910N-2
Comp
LDrv
C6
C8
5600pF
Optional
300p
R1
7.5K
Fb
GND
SS
R2
1K, 1%
R3
3K, 1%
C7
0.1uF
Single Supply 12V Input
Anachip Corp
www.anachip.com.tw
Rev. 1.1 Jul 5, 2005
4/11
AP2014/A
Synchronous PWM Controller
Typical Application Circuit (Continued)
(3) Dual Supply, 5V Bus and 12V Bias Input
5V
L1
12V
1uH
+
+
+
C4
C3
47uF
C1
C1
100uF
0.1uF
1uF
1.8V/1A
AP1187
Vcc
Vc
+
C5
47uF
Q1
HDrv
AF9410
L2
2.5V/2A
AP2014
4.7uH
Q2
C8
Comp
SS
LDrv
AF9410
C6
10nF
R1
3.3K
Fb
R3
1K
GND
R2
1K
C7
0.1uF
+
C10
1uF
C9
C11
0.1uF
Vcc
Vc
Q3
HDrv
AF9410
L3
AP2014
LDrv
3.3V/1.8A
4.7uH
+
C14
10nF
R4
Comp
Q4
C12
AF9410
150uF
3.3K
Fb
R6
1.65K
SS
GND
R5
1K
C13
0.1uF
Dual Supply, 5V Bus and 12V Bias Input
Anachip Corp
www.anachip.com.tw
Rev. 1.1 Jul 5, 2005
5/11
AP2014/A
Synchronous PWM Controller
Typical Performance Characteristics
Load Regulation
Line Regulation
2.530
2.525
2.520
2.515
2.510
2.505
2.500
2.0%
1.8%
1.6%
1.4%
1.2%
1.0%
0.8%
0.6%
0.4%
0.2%
0.0%
4.5 5.0 7.0 9.0 11.0 12.0 15.0
Vin(V)
0.0 0.5 1.0 3.0 5.0 8.0 10.0 12.0 15.0
Iout(A)
Line Regulation
Frequency v.s. Vin
1.260
210.0
205.0
200.0
195.0
190.0
185.0
180.0
175.0
1.255
1.250
1.245
1.240
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)
Anachip Corp
www.anachip.com.tw
Rev. 1.1 Jul 5, 2005
6/11
AP2014/A
Synchronous PWM Controller
Typical Performance Characteristics (Continued)
Icc and Iccq v.s. Vin
Ic and Icq v.s. Vin
16.00
14.00
12.00
10.00
8.00
15.00
13.00
11.00
9.00
Icc(mA)
Iccq(mA)
Ic(mA)
Icq(mA)
7.00
6.00
4.00
5.00
2.00
3.00
4.5
5
7
9
11
12
15
4.5
5
7
9
11
12
15
Vin(V)
Vin(V)
Vfb v.s. Temperature
Frequency v.s. Temperature
1.30
1.28
1.26
1.24
1.22
1.20
240.0
230.0
220.0
210.0
200.0
190.0
180.0
170.0
160.0
150.0
-40 -20
0
25
50
75 100 125
-40 -20
0
25 50 75 100 125
Temperature (oC)
Temperature (oC)
Icc and Ic v.s. Temperature
Efficiency v.s. Iout
10.0
9.5
9.0
8.5
8.0
7.5
7.0
6.5
6.0
100%
Icc(mA)
Ic(mA)
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)
-40 -20
0
25
50
75 100 125
Temperature (oC)
Anachip Corp
www.anachip.com.tw
Rev. 1.1 Jul 5, 2005
7/11
AP2014/A
Synchronous PWM Controller
Typical Performance Characteristics (Continued)
Vout Ripple
Vout Ripple
Vcc=5V; Vc=12V; Vout=2.5V
Iout=5A, Vripple=33.2mV
Vcc=5V; Vc=12V; Vout=2.5V
Iout=0.5A, Vripple=30.8mV
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
Anachip Corp
www.anachip.com.tw
Rev. 1.1 Jul 5, 2005
8/11
AP2014/A
Synchronous PWM Controller
Function Descriptions
Introduction
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.
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).
Short-Circuit Protection
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 outputs are protected against the short circuit.
The AP2014 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).
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 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
Soft-Start
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.
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
Marking Information
(Top View)
5
8
Logo
Part No.
ID code: internal
AP2014 X
YY WW X
AP2014 : 200KHz (OSC)
AP2014A : 400KHz (OSC)
Xth week: 01~52
Year: "01" =2001
"02" =2002
1
4
SOP-8L/PDIP-8L
Anachip Corp
www.anachip.com.tw
Rev. 1.1 Jul 5, 2005
9/11
AP2014/A
Synchronous PWM Controller
Package Information
Package Type: SOP-8L
L
VIEW "A"
D
0.015x45
VIEW "A"
7 (4X)
7 (4X)
e
B
y
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min.
1.40
0.10
1.30
0.33
0.19
4.80
3.70
-
Nom.
1.60
-
Max.
1.75
0.25
1.50
0.51
0.25
5.30
4.10
-
6.20
1.27
0.10
8O
Min.
Nom.
0.063
-
Max.
A
A1
A2
B
0.055
0.040
0.051
0.013
0.0075
0.189
0.146
-
0.069
0.100
0.059
0.020
0.010
0.209
0.161
-
0.244
0.050
0.004
8O
1.45
0.41
0.20
5.05
3.90
1.27
5.99
0.71
-
0.057
0.016
0.008
0.199
0.154
0.050
0.236
0.028
-
C
D
E
e
H
L
5.79
0.38
-
0.228
0.015
-
y
0O
-
0O
-
θ
Anachip Corp
www.anachip.com.tw
Rev. 1.1 Jul 5, 2005
10/11
AP2014/A
Synchronous PWM Controller
Package Information (Continued)
Package Type: PDIP-8L
D
E-PIN O0.118 inch
E
(4X)
15
PIN #1 INDENT O0.025 DEEP 0.006-0.008 inch
C
7
(4X)
eB
B
B1
e
S
B2
Dimensions in millimeters
Dimensions in inches
Symbol
Min.
-
Nom.
-
Max.
5.33
-
Min.
Nom.
-
Max.
A
A1
A2
B
-
0.210
0.38
3.1
-
0.015
0.122
0.014
0.055
0.032
0.008
0.355
0.300
0.242
-
-
-
3.30
0.46
1.52
0.99
0.25
9.27
7.94
6.35
2.54
3.3
3.5
0.130
0.018
0.060
0.039
0.010
0.365
0.313
0.250
0.100
0.130
0.350
0.033
0.138
0.022
0.065
0.045
0.014
0.375
0.325
0.258
-
0.36
1.4
0.56
1.65
1.14
0.36
9.53
8.26
6.55
-
B1
B2
C
0.81
0.20
9.02
7.62
6.15
-
2.92
8.38
0.71
D
E
E1
e
L
3.81
9.70
0.97
0.115
0.330
0.028
0.150
0.382
0.038
eB
S
8.89
0.84
Anachip Corp
www.anachip.com.tw
Rev. 1.1 Jul 5, 2005
11/11
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