Copyright
ANPEC Electronics Corp.
Rev. A.3 - Mar., 2005
APW7058
www.anpec.com.tw
1
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise
customers to obtain the latest version of relevant information to verify before placing orders.
Synchronous Buck PWM and Linear Controllers
Provides Two Regulated Voltages
- One Synchronous-Rectified Buck PWM
Controller
- One Linear Controller
Low Reference Voltage for Further Applications
- Both Controllers : 0.8V 2% Over
Temperature
Both Controllers Drive N-Channel MOSFETs
- PWM Controller Drives Dual N-Channel
MOSFETs
- Linear Controller Drives N-Channel MOSFET
Built-in PWM Feedback Compensation
- No Steady-State Error
-
Voltage-Mode PWM Control
- Full 0~100% Duty Ratio
- Fast Transient Response
Adjustable Outputs by External Resistor Dividers
Under-Voltage Monitoring on Both Controllers
Small Converter Size
- 600kHz Constant Switching Frequency
- Built-In Soft-Start
- Simple SO-8 Package
Shutdown Control
Lead Free Available (RoHS Compliant)
Features
Applications
Motherboard
Graphics Cards
12V, 5V and 3.3V Inputs DC-DC Converter
General Description
The APW7058 integrates one synchronous-rectified
Buck PWM controller and one linear controller to pro-
vide two regulated voltages for graphics cards and
other embedded processor applications. The PWM
controller which drives dual N-channel MOSFETs uses
fixed 600kHz frequency, voltage-mode PWM control
and integrates power-on-reset(POR), built-in soft-start,
output under-voltage monitoring and shutdown func-
tions into a single chip. The linear controller which
drives a N-channel MOSFET bypass transistor allows
users to optimize the transient response by external
components. The POR circuit with hysteresis moni-
tors both 5VCC and 12VCC supply voltages to start
up/shutdown the IC at power-on/off. An internal 0.8V
temperature-compensated reference is designed to
meet the low output voltage requirement for further
applications. The built-in soft-start function sets the
soft-start interval to prevent the output voltages from
overshoot as well as limiting the input currents. The
under-voltage protections monitor the voltages at FB
and FB2 for short-circuit protection. The under-volt-
age protections cycle the soft-start function until 3
times of UVP events are happened. Pulling and hold-
ing the FB2 pin above 1.28V to disable the both
controllers.
Pin Description
1
2
3
4
5
6
7
8
12VCC
UGATE
GND
LGATE
5VCC
DRIVE2
FB2
FB
Copyright
ANPEC Electronics Corp.
Rev. A.3 - Mar., 2005
APW7058
www.anpec.com.tw
2
A P W 705 8
H a n d lin g C od e
T e m p . R a n ge
P a ck a g e C od e
P a ck a g e C od e
K : S O P - 8
O p e ra tin g Ju n ctio n T e m p . R an g e
C : 0 to 70 C
H a n d lin g C od e
T U : T u b e
T R : T a p e & R e el
L e ad F re e C od e
L : L ea d F ree D e vic e B la nk : O rig in a l D e vice
A P W 7 0 5 8 K :
A P W 7 0 5 8
XXXXX
XXXXX - D a te C o de
L e ad F re e C od e
Ordering and Marking Information
Block Diagram
Power
On Reset
5VCC
UGATE
Oscillator
VREF
0.8V
Soft-Start
and Fault
Logic
F
O SC
600kHz
Error
Amplifier
FB
PW M
COMP
0.5V
UVP1
GND
DRIVE2
FB2
0.5V
UVP2
POR
Linear
Controller
Inhibit /
Soft-Start
5VCC
LGATE
Gate
Control
12VCC
1.28V
Shutdown
12VCC
Notes
ANPEC lead-free products contain molding compounds/die attach materials and 100% matte in plate
termination finish; which are fully compliant with RoHS and compatible with both SnPb and lead-free soldiering
operations. ANPEC lead-free products meet or exceed the lead-free requirements of IPC/JEDEC J STD-020C for
MSL classification at lead-free peak reflow temperature.
Copyright
ANPEC Electronics Corp.
Rev. A.3 - Mar., 2005
APW7058
www.anpec.com.tw
3
Symbol
Parameter
Rating
Unit
5V
CC
5VCC Supply Voltage (5VCC to GND)
-0.3 ~ 7
V
12V
CC
12VCC Supply Voltage (12VCC to GND)
-0.3 ~ 15
V
UAGTE, DRIVE2 to GND
-0.3 ~ 12V
CC
V
LGATE, FB, FB2 to GND
-0.3 ~ 5V
CC
V
Maximum Junction Temperature
150
o
C
T
STG
Storage Temperature
-65 ~ 150
o
C
T
SDR
Maximum Soldering Temperature, 10 Seconds
300
o
C
V
ESD
Minimum ESD Rating (Human body model)
2
KV
Typical Application
Q1, Q2 : APM2014N UC
D1 : 3A Schcottky Diode
Q3 : APM2055N UC
C2, C3, C5, C6, C10, C11 : 470
F/6.3V, ESR=30m
Absolute Maximum Ratings
Thermal Characteristics
Symbol
Parameter
Value
Unit
JA
Junction-to-Ambient Resistance in free air (SOP-8)
160
o
C/W
V
IN1
+3.3V
V
OUT1
+1.263V
/10A
C4
4.7uF
C2, C3
2 x 470uF
C5, C6
2 x 470uF
L1
1uH
Q1
Q2
C1
1uF
R2
1.02k
R5
0
R4
2.2
C11
470uF
C10
470uF
V
IN2
+3.3V
Q3
V
OUT2
+2.5V/3A
R7
2.37k
R8
1.13k
UGATE
5VCC
5
GND
3
DRIVE2
6
2
U1
APW7058
FB2
7
LGATE
4
FB
8
R6
0
C8
1uF
12VCC
1
+12V
R9
0
R10
27k
C9
33pF
C7
68nF
R1
590
R3
0
L2
1uH
+5V
D1
Copyright
ANPEC Electronics Corp.
Rev. A.3 - Mar., 2005
APW7058
www.anpec.com.tw
4
APW7058
Symbol
Parameter
Test Conditions
Min
Typ Max
Unit
SUPPLY CURRENT
I
CC
5VCC Supply Current
LGATE Open, FB2=DRIVE2
2.5
mA
12VCC Supply Current
UGATE Open
2.5
mA
POWER-ON RESET
Rising 5VCC Threshold
12V
CC
=12V
4.0
4.2
4.5
V
Falling 5VCC Threshold
12V
CC
=12V
3.5
3.7
3.9
V
Rising 12VCC Threshold
5V
CC
=5V
9.6
10.3 10.8
V
Falling 12VCC Threshold
5V
CC
=5V
9.3
9.7
10.2
V
OSCILLATOR
F
OSC
Free Running Frequency
550
600
650
kHz
Ramp Upper Threshold
2.85
V
Ramp Lower Threshold
0.95
V
V
OSC
Ramp Amplitude
1.9
V
P-P
REFERENCE VOLTAGE
V
REF
Reference Voltage
0.8
V
System Accuracy
Over Line, Load and
Temperature
-2
+2
%
Symbol
Parameter
Range
Unit
5V
CC
5VCC Supply Voltage
5
5%
V
12V
CC
12VCC Supply Voltage
12
10%
V
V
OUT1
Output Voltage of the Buck converter
0.8 ~ 3.3
V
V
IN1
Input Voltage of the Buck converter
3.3/5
5%
V
V
OUT2
Output Voltage of the Linear Regulator
0.8 ~ 3.3
V
V
IN2
Input Voltage of the Linear Regulator
3.3/5
5%
V
T
A
Ambient Temperature
0 ~ 70
o
C
T
J
Junction Temperature
0 ~ 125
o
C
Electrical Characteristics
Recommended Operating Conditions
(Note)
Note : Refer to the typical application circuit
Unless otherwise specified, these specifications apply over 5V
CC
=5V, 12V
CC
=12V and T
A
= 0~70
o
C. Typical
values are at T
A
=25
o
C.
Copyright
ANPEC Electronics Corp.
Rev. A.3 - Mar., 2005
APW7058
www.anpec.com.tw
5
APW7058
Symbol
Parameter
Test Conditions
Min
Typ Max
Unit
BUILT-IN PWM FEEDBACK COMPENSATION
DC Gain
75
dB
F
P
First Pole Frequency
10
Hz
F
Z
First Zero Frequency
1
kHz
UGATE Duty Range
0
100
%
FB Input Current
0.1
A
PWM CONTROLLER GATE DRIVERS
UGATE Source
V
UAGTE
=1V
0.6
A
UGATE Sink
V
UGATE
=1V
7.3
LGATE Source
V
LGATE
=1V
0.6
A
LGATE Sink
V
LGATE
=1V
1.8
T
D
Dead Time
50
nS
LINEAR CONTROLLER
DC Gain
78
dB
C
L
=0.5nF
1.6
Gain Bandwidth Product
C
L
=1nF
1
MHz
FB Input Current
0.1
A
DRIVE2 Source Current
V
FB2
=V
REF
-20mV, V
DRIVE2
=7V
9.8
mA
DRIVE2 Sink Current
V
FB2
=V
REF
+20mV, V
DRIVE2
=3V
2.6
mA
DRIVE2 Output High Voltage DRIVE2 Open
11.7
V
DRIVE2 Output Low Voltage
DRIVE2 Open
0.01
V
UNDER-VOLTAGE PROTECTION
UV
FB
FB/FB2 Under-Voltage Level
FB or FB2 Falling
0.5
V
FB/FB2 Under-Voltage
Hysteresis
15
mV
SOFT-START AND SHUTDOWN
T
SS
Soft-Start Interval
2
mS
FB2 Shutdown Threshold
FB2 Rising
1.28
V
FB2 Shutdown Hysteresis
30
mV
Electrical Characteristics (Cont.)
Unless otherwise specified, these specifications apply over 5V
CC
=5V, 12V
CC
=12V and T
A
= 0~70
o
C. Typical
values are at T
A
=25
o
C.
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