CXSD62359使用恒定的实时控制方案来轻松处理宽的输入/输出电压比，并在保持相对恒定的开关频率的同时，对负载瞬态提供100ns的“瞬时通电”响应。CXSD62359通过消除传统电流模式PWMs中的电流感应电阻，以较低的成本实现了高效率。驱动超大同步整流mosfet的能力进一步提高了效率。单级降压转换允许这些设备直接降压高压电池，以获得尽可能高的效率。
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产品概述 返回TOP
CXSD62359 uses constant on-time control scheme to handle wide input/output voltage ratios with ease and provides 100ns “instant-on” response to load transients while maintaining a relatively constant switching frequency. The CXSD62359 achieves high efficiency at a reduced cost by eliminating the current-sense resistor found in traditional current-mode PWMs. Efficiency is further enhanced by an ability to drive very large synchronous rectifier MOSFETs. Single-stage buck conversion allows these devices to directly step down high-voltage batteries for the highest possible efficiency. Alternatively, two-stage conversion (stepping down the +5V system supply instead of the battery) at a higher switching frequency allows the minimum possible physical size. The CXSD62359 is intended for CPU core, chipset, DRAM, or other low-voltage supplies as low as 0.75V. The CXSD62359 is available in 16-pin TQFN 3X3 and SSOP-16 package and includes over voltage protection
产品特点 返回TOP
Ultra-High Efficiency
No Current-Sense Resistor (Lossless ILIMIT)
Quasi-PWM with 100ns Load-Step Response
1% VOUT Accuracy Over Line and Load
0.75V to 3.6V Adjustable Output Range
4.5V to 24V Battery Input Range
Integrated Boost Diode
OVP & UVP
1.7ms Soft-Start
Drives Large Synchronous-Rectifier FETs
Power-Good Indicator
应用范围 返回TOP
Notebook Computers
CPU Core Supply
I/O Supply
Chipset/RAM Supply as Low as 0.75V
Networking Power Supply
技术规格书（产品PDF) 返回TOP
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产品封装图 返回TOP
电路原理图 返回TOP
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Synchronous (Quasi-PWM) Step Down Controller |
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Part NO. |
Vin(V) min. |
Vin(V) max. |
VOUT (V) |
FSW (k Hz) |
FB (V) |
Note |
Package |
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3 |
28 |
0.7~1.8 |
300/400 |
0.8 |
EN, SS, PGOOD, OVP, UVP, OCP, VTTREF, Built-in BST diode, DDR1/2/3/3L, 2A LDO for VTT |
TQFN3X3-20 |
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4.5 |
28 |
0.7~2.6 |
ADJ |
0.7 |
EN, PGOOD, OVP, UVP, OCP, VOUT Adjustable,1.5ms VOUT Servo Soft Start, 4700ppm/°C RON Coefficient |
TDFN3X3-10 |
|
|
4.5 |
28 |
0.5~3.3 |
ADJ |
0.5 |
EN, PGOOD, OVP, UVP, OCP, VOUT Adjustable, 1.5ms VOUT Servo Soft Start, 4700ppm/°C RON Coefficient |
TQFN2X2-12 |
|
|
4.5 |
24 |
0.75~3.6 |
ADJ |
0.75 |
EN, SS, PGOOD, OVP, UVP, OCP, Built-in BST diode |
TQFN3X3-16 |
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|
4.5 |
24 |
0.75~3.6 |
ADJ |
0.75 |
EN, SS, PGOOD, OVP, UVP, OCP, Built-in BST diode |
TQFN3X3-16 |
|
|
4.5 |
24 |
0.75~3.6 |
ADJ |
0.75 |
EN, SS, PGOOD, OVP, UVP, OCP, Built-in BST diode |
TQFN3X3-16/TQFN3.5X3.5-14 |
|
|
2 |
24 |
0.75~3.6 |
400/ADJ |
0.75 |
EN, SS, PGOOD, OVP, UVP, OCP, VTTREF, Built-in BST diode, DDR1/2/3/3L, 3A/2A LDO for VTT |
TQFN4X4-24/TQFN3X3-20 |
|
|
4.5 |
24 |
0.75~3.6 |
ADJ |
0.75 |
EN, PGOOD, OVP, UVP, OCP, Built-in BST diode, SS, G0 & G1 Controls VOUT |
TQFN3X3-16 |
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◀ 上一篇: 4.5V至24V电池输入PWM控制器恒导通控制方案CXSD62358驱动同步整流器FET恒定的开关频率
下一篇▶:0.75V至3.6V可调输出CXSD62360同步整流mosfet负载阶跃响应准脉宽调制单级降压转换软启动
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