APW1175 Datasheet, PDF (1/10 Pages) Anpec Electronics Coropration – DUAL SYNCHRONOUS DC/DC CONTROLLER WITH CURRENT SHARING CONTROL

APW1175
Dual Synchronous DC/DC Controllers with Current Sharing Control
Features
General Description
• 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
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).
• Soft-Start and Enable Function
• Power-ON Reset (POR) Monitor
• Power Good Monitor for Outputs
Pin Description
Applications
• Graphics Cards
• DDR Memory
• SSTL-2 Termination
• Power Supply Requiring Two Outputs
VREF 1
+IN2 2
-IN2 3
VCC 4
CL2- 5
CL2+ 6
BST2 7
DH2 8
DL2 9
PGN D 10
20 GN D
19 PW R GD
18 -IN 1
17 SS/EN A
16 C L1-
15 C L1+
14 BST1
13 D H 1
12 D L1
11 BSTC
Ordering and Marking Information
)29 %#
Lead Free Code
Handling Code
Temp. Range
Package Code
Package Code
K : SOP-20
Temp. Range
C : 0 to 70°C
Handling Code
TU : Tube
TR : Tape & Reel
Lead Free Code
L : Lead Free Device
Blank : Orginal Device
APW 1175 K :
APW 1175
XXXXX
XXXXX - Date Code
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.
1
Rev. A.3 - July., 2003
www.anpec.com.tw