APW1175
Dual Synchronous DC/DC Controllers with Current Sharing Control
Features
•
Two Operation Modes
- Independent Operation
- Two-Phase Operation with Current Sharing
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-
back. The two PWM controllers are 180
o
out of phase to
minimize the input ripple (common power input) and the
output ripple (two-phase mode).
•
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
Pin Description
VR EF
+IN 2
-IN 2
VC C
C L2-
C L2+
BST2
DH2
D L2
PGN D
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
Applications
•
•
•
•
Graphics Cards
DDR Memory
SSTL-2 Termination
Power Supply Requiring Two Outputs
GN D
PW R GD
-IN 1
SS/EN A
C L1-
C L1+
BST1
DH1
D L1
BSTC
Ordering and Marking Information
)29 %#
Lead Free Code
Handling Code
Tem p. R ange
Package Code
Package Code
K : SO P-20
Tem p. R ange
C : 0 to 70°C
Handling Code
TU : Tube
TR : Tape & R eel
Lead Free Code
L : Lead Free D evice
Blank : O rginal Device
XXXXX - Date Code
APW 1175 K :
APW 1175
XXXXX
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
1
www.anpec.com.tw
ANPEC [ ANPEC ELECTRONICS COROPRATION ]
