ANPEC APW1175KC-TUL, APW1175KC-TU, APW1175KC-TRL, APW1175KC-TR Datasheet
APW1175
Dual Synchronous DC/DC Controllers with Current Sharing Control
Features
• Two Operation Modes
- Independent Operation
- Two-Phase Operation with Current Sharing
• Driving N-Channel MOSFETs
•
300kHz Constant Frequency Operation
• Built-in Feedback Compensation
- Voltage-Mode PWM Control
- Fast Transient Response
• ±1% VREF Accuracy Over Temperature
•
Adjustable Output Voltage by an External Resistor
Divider
• Phase-Shifted Switchers to Minimize Ripple
• Current Limit with 50% Fold-Back
•
Soft-Start and Enable Function
••
• Power-ON Reset (POR) Monitor
••
••
• Power Good Monitor for Outputs
••
General Description
The APW1175 is a two-phase, synchronous, and voltage
mode PWM controller to provide dual channel or single
outputs in two distinct operation modes. In independent
mode, the two PWM converters supply two independently
regulated voltages by converting a common or two differ-
ent power inputs. In two-phase mode, the two PWM con-
verters supply one regulated voltage with programmable
current sharing control by converting a common or two
different power inputs. The two-phase mode can supply
the larger power than that provided each single channel.
APW1175 features an internal 300KHz oscillator, VCC
Power-On-Reset (POR), an external adjustable soft-start
and the programmable output current limit with 50% fold-
o
back. The two PWM controllers are 180
out of phase to
minimize the input ripple (common power input) and the
output ripple (two-phase mode).
Pin Description
Applications
••
• Graphics Cards
••
••
• DDR Memory
••
••
• SSTL-2 Termination
••
••
• Power Supply Requiring Two Outputs
••
VREF
+IN 2
-IN 2
VCC
CL2-
CL2+
BST2
DH2
DL2
PGND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
GND
PWR G D
-IN 1
SS/ENA
CL1-
CL1+
BST1
DH1
DL1
BSTC
Ordering and Marking Information
)29 %#
Lead Free Code
Handling Code
Temp. Range
Package Code
APW 1175 K :
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.
Copyright ANPEC Electronics Corp.
Rev. A.3 - July., 2003
APW 1175
XXXXX
Package Code
K : SOP -20
Temp. Range
C : 0 to 70°C
Handling Code
TU : Tube TR : Tap e & Reel
Lead Free Code
L : Lead Free Device Blank : Orginal Device
XXXXX - Date Code
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APW1175
Block Diagram
VR EF -IN1 CL1- CL1+
PWRGD
VCC
SS/ENA
25uA
POWER-ON
RESET(POR)
4V
+IN2
-IN2
0.125V
0.125V
0.125V
Master Error
Am plifier
V REF
1.25V
soft-start
control
Slave Error
Am plifier
V CL1
OSC
V
CL2
CL2- CL2+
300KHZ
R
Q
S
R
Q
S
S
Q
R
Absolute Maximum Ratings Operating Conditions
BSTC
BST1
DH1
DL1
GND
BST2
DH2
DL2
PGND
••
• VCC to GND . . . . . . . . . . . . . -0.3V ~ 15V
••
••
• PGND to GND . . . . . . . . . . . . ±1V
••
••
• BST to GND . . . . . . . . . . . . . -0.3V ~ 22V
••
••
• Junction Temperature . . . . . . . 150
••
••
• Storage Temperature . . . . . . . -65
••
••
• Soldering Temperature . . . 300
••
••
• Minimum ESD Rating . . . . . . . ±3kV
••
o
C
o
C ~ 150oC
o
C , 10 Seconds
Thermal Characteristics
Symbol
R
JA
Copyright ANPEC Electronics Corp.
Rev. A.3 - July., 2003
Thermal Resistance in Free Air
Parameter Rating Unit
SOIC
SOIC(with 3in
••
• VCC . . . . . . . . . . . . . . . . . . . . 4.2V ~ 15V
••
••
• BST. . . . . . . . . . . . . . . . . . . . . 5V ~ 17V
••
www.anpec.com.tw2
o
C to 85oC
o
C to 125oC
C/W
°
••
• Ambient Temperature Range . . . 0
••
••
• Junction Temperature Range. . . . 0
••
75
of Copper)
65
APW1175
Electrical Characteristics
Unless otherwise specified, these specifications apply over VCC=4.75~5.25V, GND=PGND=0V, and T)=0~85°C.
Typical values refer to T
Symbol Parameter Test Conditions
SUPPLY CURRENT
ICC V
BSTC
I
BST1,2
I
CC
Supply Current
BSTC Supply Current
BST1,2 Supply Current
POWER-ON RESET
CC
POR Threshold Voltage VCC Rising 3.6 4.2 V
V
OSCILLATOR
OSC
F
O s c illator F requency
Maxim um Duty C ycle
Ramp Amplitude
∆V
OSC
ERROR AMPLIFIER
AOL Error Amplifier Voltage Gain 35 dB
REFERENCE VOLTAGE
V
Reference Voltage Measure Pin 1 1.238 1.250 1.262 V
REF
REF
Load Regulation I
V
REF
Line Regulation VCC = 5~15V
V
PWM CONTROLLERS GATE DRIVERS
DH Source
DH Sink
DL Source
DL Sink
Dead Time 50 200 nS
CURRENT LIMIT PROTECTION
VCL
Current Limit Voltage 60 70 80 mV
SOFT-START
ISS
Soft-S tart C urrent V
Soft-Start Transition Synchronous PW M 3.3 V
Copyright ANPEC Electronics Corp.
Rev. A.3 - July., 2003
)=25°C.
CC
V
=5~15V, F
BSTC=5V, DL1,2=Open,
OSC
=300kHz
F
BST1,2=10V, DH1,2=Open,
OSC
=300kHz
F
Input Bias Current
(-IN1, +IN2, -IN 2)
Input Voltage = 1.25V
REF
= 1m A
BSTH-DH=5V
BSTH-DH=2.5V
DH-PGND=3.5V
DH-PGND=1.75V
BSTL-DL=5V
BSTL-DL=2.5V
DL-PGND=3.5V
DL-PGND=1.75V
OUT
=0V (refer to application
Fold Back Current
V
circuit)
Fold Back Voltage Knee I=I
SS
=1V 25
APW1175
Min Typ Max
OSC
=300kHz
9 mA
2.8
1.6
270 300 330 KHz
DH1
DH2
80 90
100
1.1 V
0.5 1
3.5
1
0.5
1
0.5
1
0.5
1
0.5
50% I
LIM
(refer to application circuit) 1.25 V
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0.5 %
OUT
V
Unit
mA
mA
%
µA
mV
A
A
A
A
LIM
µA
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