ANACHIP AP2014-ASA

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
- Fixed Frequency Voltage Mode
- 500mA Peak Output Drive Capability
- Protects the output when control FET is shorted
- SOP-8L/PDIP-8L Pb-Free package
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.
„ 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
(Top View)
Pin
Name
Pin
No.
FB
1
8 SS
FB 1
Vcc 2
7 Comp
AP2014/A
LDrv 3
6 Vc
GND 4
5 HDrv
Vcc
2
LDrv
3
SOP-8L/PDIP-8L
GND
4
HDrv
5
Vc
6
Comp
7
SS
8
Description
This pin is connected directly to the output of the
switching regulator via resistor divider to provide
feedback to the Error amplifier.
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.
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.
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. 1.2 Nov 29, 2005
1/12
AP2014/A
Synchronous PWM Controller
„ Ordering Information
AP2014/A X
X
Package
Packing
S: SOP-8L
N: PDIP-8L
Blank : Tube
A : Taping
„ Block Diagram
Vc
6
3V
FbLo Comp
-
20uA
0.5V
+
SS
POR
8
POR
64uA
Max
Ct
1.25V
25K
Fb
1
Comp
7
Error Amp
+
Oscillator
+
Error Comp
R
-
25K
Vcc
+ 0.2V
Vc
3.5V
Q
2
Vcc
3
LDrv
Reset Dom
-
4.0V
5 HDrv
S
Bias
Generator
3V
1.25V
POR
+ 0.2V
-
4
GND
„ Absolute Maximum Ratings
Symbol
Range.
Unit
VCC
Vcc Supply Voltage
Parameter
20
V
VC
Vc Supply Voltage (not rated for inductive load)
32
TST
Storage Temperature Range
TJ
Operating Junction Temperature Range
șJC
șJA
Thermal Resistance Junction to Case
Thermal Resistance Junction to Ambient
Anachip Corp
www.anachip.com.tw
V
-65 to 150
o
C
0 to 125
o
C
90
o
C/W
250
o
C/W
Rev. 1.2 Nov 29, 2005
2/12
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
Reference Voltage
VFB
Parameter
FB Voltage
LREG
UVLO
FB Voltage Line Regulation
UVLO Threshold - VCC
UVLO Hysteresis - VCC
UVLO Threshold - VC
UVLO Hysteresis - VC
UVLO VCC
UVLO VC
UVLO Threshold - FB
UVLO FB
Conditions
Min.
Typ.
Max.
1.225
0.784
-
1.25
0.8
0.2
1.275
0.816
0.35
%
4.0
3.1
-
4.2
0.25
3.3
0.2
4.4
3.5
-
V
V
V
V
0.4
0.6
0.8
V
0.3
0.4
0.5
V
-
0.1
-
V
-
7
10
mA
-
7
10
mA
-
3.3
1
6
4.5
mA
mA
SS=0V
10
20
30
µA
SS=3V, FB=1V
SS=0V, FB=1V
450
-0.1
-64
600
750
µA
µA
µmho
170
340
1.225
200
400
1.25
230
460
1.275
KHz
KHz
V
50
85
0
50
50
150
90
0
100
100
250
95
-
ns
ns
ns
%
%
AP2014
AP2014A
5 < Vcc < 12
Supply Ramping Up
Supply Ramping Up
FB Ramping Down
(AP2014)
FB Ramping Down
(AP2014A)
UVLO Hysteresis - FB
Unit
V
Supply Current
Operation ICC VCC Operation Supply Current
Operation IC
VC Operation Supply Current
ICCQ
VCC Static Supply Current
ICQ
VC Static Supply Current
Soft-Start Section
SSIB
Charge Current
Error Amp
IFB1
FB Voltage Input Bias Current
IFB2
FB Voltage Input Bias Current
gm
Transconductance
Oscillator
Freq
Frequency
VRAMP
Ramp-Amplitude Voltage
Output Drivers
Tr
Rise Time
Tf
Fall Time
TDB
Dead Band Time
TON
Max Duty Cycle
TOFF
Min Duty Cycle
Freq=200KHz,
CL=1500pF
Freq=200KHz,
CL=1500pF
SS=0V
SS=0V
AP2014
AP2014A
CL =1500pF
CL =1500pF
FB=1V, Freq=200KHz
FB=1.5V
Anachip Corp
www.anachip.com.tw
Rev. 1.2 Nov 29, 2005
3/12
AP2014/A
Synchronous PWM Controller
„ Typical Application Circuit
(1)
VIN=5V
Vc=12V
C8
470u
C11
0.1u
C3
1u
R3
8.2
C4
0.1u
1
2
3
4
C5
0.47u
R1
820
U1
8
FB
SS
Vcc Comp 7
Vc 6
LDrv
GND HDrv 5
C6
AP2014
10nF
Q1
AF9410N
L1
5.6u/9.0
R2
3.3K
Vout +1.5V/7.0A
Q2
AF9410N
R6
22k
C20
100p
C12
C13
C17
470u
470u
0.1u
(2)
VIN=12V
D2
1N4148
D1
C1
0.1uF
C8
C11
470u
0.1u
1N4148
C4
0.1u
R3
8.2
C3
100u
1
2
3
4
U1
FB
SS
Vcc Comp
Vc
LDrv
GND HDrv
AP2014
C5
0.47u
R1
820
8
7
6
5
Q1
AF9410N
R2
3.3K
L1
5.6u/9A
Vout +1.5V/7.0A
C6
10nF
Q2
AF9410N
R6
6.8k
C20
100p
Option
C12
C13
C17
470u
470u
0.1u
Single Supply 12V Input
Anachip Corp
www.anachip.com.tw
Rev. 1.2 Nov 29, 2005
4/12
AP2014/A
Synchronous PWM Controller
„ Typical Application Circuit (Continued)
(3)
VIN=12V
D2
1N4148
C1
0.1uF
D1
C8
C11
470u
0.1u
1N4148
C4
0.1u
R3
8.2
1
2
3
4
C3
100u
R1
10K
U1
FB
SS
Vcc Comp
Vc
LDrv
GND HDrv
8
7
6
5
R2
3K
Q1
AF4910N-1
L1
10uH/6A
AP2014
Vout +5V/5.0A
C6
10nF
C5
0.47u
Q2
AF4910N-2
R6
39k
C20
100p
C13
C17
470u
0.1u
Single Supply 12V Input
(4)
VIN=24V
RZD
1.2K
C1
0.1uF
D1
470u
0.1u
C4
0.1u
R3
8.2
R3
8.2
1
2
3
4
U1
FB
SS
Vcc Comp
Vc
LDrv
GND HDrv
AP2014
C3
100u
C11
1N4148
D2
1N4148
ZD
6.2V
C8
C5
0.47u
R1
10K
8
7
6
5
Q1-1
AF4928N-1
L1
10uH/6A
R2
3.3K
Vout +5V/4.0A
C6
10nF
Q1-2
AF4928N-2
R6
47k
C20
100p
C13
C17
470u
0.1u
IZD(Њ15mA)=(VIN-VD2-VZD)/RZD
Single Supply 24V Input
Anachip Corp
www.anachip.com.tw
Rev. 1.2 Nov 29, 2005
5/12
AP2014/A
Synchronous PWM Controller
„ Typical Application Circuit (Continued)
(5) Dual Supply, 5V Bus and 12V Bias Input
5V
L1
12V
+ C3
100uF
C1
1uF
C1
0.1uF
Vcc
1uH
+
Q1
AF9410
L2
AP2014
Comp
1.8V/1A
AP1187
Vc
HDrv
C8
10nF
R1
3.3K
+ C4
47uF
10uH
Q2
AF9410
LDrv
C5
47uF
2.5V/2A
+
C6
220uF
Fb
SS
GND
R2
1K
R3
1K
C7
0.1uF
+
C10
1uF
C9
0.1uF
Vcc
Vc
C11
Q3
AF9410
HDrv
L3
AP2014
C14
10nF
R4
3.3K
Comp
10uH
LDrv
Q4
AF9410
3.3V/1.8A
+
C12
220uF
Fb
SS GND
R6
1.65K
R5
1K
C13
0.1uF
Dual Supply, 5V Bus and 12V Bias Input
Anachip Corp
www.anachip.com.tw
Rev. 1.2 Nov 29, 2005
6/12
AP2014/A
Synchronous PWM Controller
„ Typical Performance Characteristics
Efficiency v.s. Iout
Load Regulation
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
2.0%
1.6%
Efficiency (%)
Load Regulation (%)
1.8%
1.4%
1.2%
1.0%
0.8%
0.6%
0.4%
0.2%
0.0%
0.0 0.5 1.0 3.0 5.0 8.0 10.0 12.0 15.0
0.0 0.5 1.0 3.0 5.0 8.0 10.0 12.0 15.0
Iout(A)
Iout(A)
Line Regulation
Line Regulation
2.530
Output Voltage (V)
Feedback Voltage (V)
1.260
1.255
1.250
1.245
2.525
2.520
2.515
2.510
2.505
2.500
1.240
4.5
5.0
7.0
9.0
11.0
12.0
4.5
15.0
5.0 7.0
Frequency v.s. Temperature
Frequency v.s. Vin
210.0
240.0
205.0
230.0
Frequency (KHz)
Frequency (KHz)
9.0 11.0 12.0 15.0
Vin(V)
Vin(V)
200.0
195.0
190.0
185.0
180.0
220.0
210.0
200.0
190.0
180.0
170.0
160.0
175.0
150.0
4.5
5.0
7.0
9.0 11.0 12.0 15.0
-40
-20
0
25
50
75
100 125
Temperature (oC)
Vin(V)
Anachip Corp
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Rev. 1.2 Nov 29, 2005
7/12
AP2014/A
Synchronous PWM Controller
„ Typical Performance Characteristics (Continued)
Ic and Icq v.s. Vin
Icc and Iccq v.s. Vin
16.00
15.00
11.00
Ic and Icq (mA)
Icc and Iccq (mA)
14.00
13.00
Icc(mA)
Iccq(mA)
9.00
7.00
12.00
10.00
Ic(mA)
8.00
Icq(mA)
6.00
4.00
5.00
2.00
3.00
4.5
5
7
9
11
12
4.5
15
5
7
12
15
1.30
Icc(mA)
9.5
Ic(mA)
9.0
Icc and Ic (mA)
11
Vfb v.s. Temperature
Icc and Ic v.s. Temperature
Feedback Voltage (V)
10.0
9
Vin(V)
Vin(V)
8.5
8.0
7.5
7.0
6.5
6.0
1.28
1.26
1.24
1.22
1.20
-40
-20
0
25
50
o
75
100
125
-40
Temperature ( C)
Ic(mA)
19.0
Icc(mA)
0
25
50
75
Temperature (oC)
100 125
AP2014 Ic and Icc vs Vc
AP2014A Ic and Icc vs Vc
21.0
-20
20.0
Ic(mA)
18.0
17.0
16.0
15.0
14.0
13.0
12.0
11.0
10.0
9.0
8.0
7.0
6.0
5.0
4.0
Icc(mA)
2.0
3.0
6
8
10
12
14
16
18
20
22
6
24
Vc(V)
Anachip Corp
www.anachip.com.tw
8
10 12 14 16 18 20 22 24
Vc(V)
Rev. 1.2 Nov 29, 2005
8/12
AP2014/A
Synchronous PWM Controller
„ Typical Performance Characteristics (Continued)
Vout Ripple
Vcc=5V; Vc=12V; Vout=2.5V
Iout=0.5A, Vripple=30.8mV
Vout Ripple
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
Anachip Corp
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Rev. 1.2 Nov 29, 2005
9/12
AP2014/A
Synchronous PWM Controller
„ Function Descriptions
Introduction
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 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).
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.
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).
Under-Voltage Lockout
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
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.
IC Quiescent Power Dissipation
Power dissipation for IC controller 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.
„ Marking Information
(Top View)
5
8
Logo
ID code: internal
Part No.
AP2014 : 200KHz (OSC)
AP2014A : 400KHz (OSC)
AP2014 X
YY WW X
1
4
Xth week: 01~52
Year: "01" =2001
"02" =2002
~
SOP-8L/PDIP-8L
Anachip Corp
www.anachip.com.tw
Rev. 1.2 Nov 29, 2005
10/12
AP2014/A
Synchronous PWM Controller
„ Package Information
H
E
Package Type: SOP-8L
L
VIEW "A"
D
0.015x45
7 (4X)
e
B
A1
C
A
A2
7 (4X)
VIEW "A"
y
Symbol
A
A1
A2
B
C
D
E
e
H
L
y
T
Dimensions In Millimeters
Min.
Nom.
Max.
1.40
1.60
1.75
0.10
0.25
1.30
1.45
1.50
0.33
0.41
0.51
0.19
0.20
0.25
4.80
5.05
5.30
3.70
3.90
4.10
1.27
5.79
5.99
6.20
0.38
0.71
1.27
0.10
8O
0O
Anachip Corp
www.anachip.com.tw
Dimensions In Inches
Min.
Nom.
Max.
0.055
0.063
0.069
0.040
0.100
0.051
0.057
0.059
0.013
0.016
0.020
0.0075
0.008
0.010
0.189
0.199
0.209
0.146
0.154
0.161
0.050
0.228
0.236
0.244
0.015
0.028
0.050
0.004
0O
8O
Rev. 1.2 Nov 29, 2005
11/12
AP2014/A
Synchronous PWM Controller
„ Package Information (Continued)
Package Type: PDIP-8L
D
E1
E-PIN O0.118 inch
E
15 (4X)
PIN #1 INDENT O0.025 DEEP 0.006-0.008 inch
C
7 (4X)
A1
L
A
A2
eB
B
S
Symbol
A
A1
A2
B
B1
B2
C
D
E
E1
e
L
eB
S
e
B1
B2
Dimensions in millimeters
Min.
Nom.
Max.
5.33
0.38
3.1
3.30
3.5
0.36
0.46
0.56
1.4
1.52
1.65
0.81
0.99
1.14
0.20
0.25
0.36
9.02
9.27
9.53
7.62
7.94
8.26
6.15
6.35
6.55
2.54
2.92
3.3
3.81
8.38
8.89
9.70
0.71
0.84
0.97
Anachip Corp
www.anachip.com.tw
Dimensions in inches
Min.
Nom.
Max.
0.210
0.015
0.122
0.130
0.138
0.014
0.018
0.022
0.055
0.060
0.065
0.032
0.039
0.045
0.008
0.010
0.014
0.355
0.365
0.375
0.300
0.313
0.325
0.242
0.250
0.258
0.100
0.115
0.130
0.150
0.330
0.350
0.382
0.028
0.033
0.038
Rev. 1.2 Nov 29, 2005
12/12