|
Details, datasheet, quote on part number:NCP5424
| |
Datasheet text preview:
NCP5424 Dual Synchronous Buck Controller with Input Current Sharing
The NCP5424 is a flexible dual N-channel synchronous buck controller utilizing V2TM control for fast transient response and excellent line and load regulation. This highly versatile controller can be configured as a single two phase output converter that draws programmable amounts of current from two different input voltages or all current from one supply. The NCP5424 can also be configured as two independent out-of-phase controllers. Using the NCP5424 in a current sharing input configuration is ideal for applications where more power is required than is available from one supply, such as video cards or other plug-in boards. When configured as a dual output controller, the output of one controller can be divided down and used as the reference for the second controller. This tracking capability is useful in applications such as Double Data Rate (DDR) Memory power where the termination voltage must track VDD. T h e NCP5424 provides a cycle- t o - c y c l e current limit on Controller 2 allowing the system to handle transient overcurrent events and a hiccup mode overcurrent protection on Controller 1 allowing lossless short circuit protection. In addition, the NCP5424 provides Soft Start, undervoltage lockout, and built-in adaptive FET nonoverlap time to prevent shoot through.
Features http://onsemi.com
SO-16 D SUFFIX CASE 751B 1
16
PIN CONNECTIONS AND MARKING DIAGRAM
1 GATE(H)1 GATE(L)1 GND BST IS+1 ISVFB1 COMP1 16 GATE(H)2 GATE(L)2 VCC ROSC IS+2 VFB+2 VFB- 2 COMP2
NCP5424 AWLYWW
· · · · · · ·
Hiccup Mode Current Limit (Controller 1) Cycle-to-Cycle Current Limit (Controller 2) Programmable Soft Start 100% Duty Cycle for Enhanced Transient Response 150 kHz to 600 kHz Programmable Frequency Operation Switching Frequency Set by Single Resistor Out-Of-Phase Synchronization Between the Channels Reduces the Input Filter Requirement · Undervoltage Lockout
Applications
A WL Y WW
= Assembly Location = Wafer Lot = Year = Work Week
ORDERING INFORMATION
Device NCP5424D NCP5424DR2 Package SO-16 SO-16 Shipping 48 Units/Rail 2500 Tape & Reel
· · · ·
Video Graphics Card DDR Memory High Current (Two-Phase) Power Supplies Dual Output DC-DC Converters
© Semiconductor Components Industries, LLC, 2003
1
June, 2003 - Rev. 3
Publication Order Number: NCP5424/D
NCP5424
12 V
3.3 V 5.0 V
+ + C2 220 µF + C17 + C18
220 µF C1 220 µF
220 µF
C6 C11 0.1 µF R1 xk R2 xk L2
+ C3/4/5
1.0 µF U1 VCC Q3 MTD60N03 Q4 MTD90N02 IS+1 IS+2 NCP5424 ISCOMP1 R5 5 k ± 1% C8 .22 µF VFB1 GND VFB- 2 ROSC R12 30.9 k VFB+2 COMP2 C13 0.01 µF C14 0.1 µF GATE(L)1 GATE(L)2 Q2 MTD90N02 R17 4k GATE(H)1 BST GATE(H)2 Q1 MTD60N03 L1 1.3 µH/15 A
+
1.3 µH/15 A
680 µF/ 4V
C19/20/21 680 µF/ 4V
R3 x k ± 1%
R4 x k ± 1%
R6 10 k ± 1%
1.5 V @ 20 A
Figure 1. Two-Phase Buck Regulator Application, with Input Current Sharing
http://onsemi.com
2
NCP5424
MAXIMUM RATINGS*
Rating Operating Junction Temperature, TJ Storage Temperature Range, TS ESD Susceptibility (Human Body Model) Package Thermal Resistance, SO-16: Lead Temperature Soldering: 1. 60 second maximum above 183°C. *The maximum package power dissipation must be observed. Junction-to-Case, RJC Junction-to-Ambient, RJA Reflow: (SMD styles only) (Note 1) Value 150 -65 to +150 2.0 28 115 230 peak Unit °C °C kV °C/W °C/W °C
MAXIMUM RATINGS
Pin Symbol VCC COMP1, COMP2 VFB1, VFB+2, VFB- 2 BST ROSC GATE(H)1, GATE(H)2 GATE(L)1, GATE(L)2 GND IS+1, IS+2 ISPin Name IC Power Input Compensation Capacitor for Channel 1 or 2 Voltage Feedback Input for Channel 1 or 2 Power Input for GATE(H)1, 2 Oscillator Resistor High-Side FET Driver for Channel 1 or 2 Low-Side FET Driver for Channel 1 or 2 Ground Positive Current Sense for Channel 1 or 2 Negative Current Sense for Channels 1 and 2 VMAX 16 V 4.0 V 5.0 V 20 V 4.0 V 20 V 16 V 0V 6.0 V 6.0 V VMIN -0.3 V -0.3 V -0.3 V -0.3 V -0.3 V -0.3 V -0.3 V 0V -0.3 V -0.3 V ISOURCE N/A 1.0 mA 1.0 mA N/A 1.0 mA 1.5 A peak 200 mA DC 1.5 A peak 200 mA DC 1.5 A peak 200 mA DC 1.0 mA 1.0 mA ISINK 1.5 A peak 200 mA DC 3.5 mA 1.0 mA 1.5 A peak 200 mA DC 1.0 mA 1.5 A peak 200 mA DC 1.5 A peak 200 mA DC N/A 1.0 mA 1.0 mA
http://onsemi.com
3
|
|
