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UCC2585 Datasheet

  • UCC2585

  • Low Voltage Synchronous Buck Controller

  • 10頁

  • TI

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UCC2585
UCC3585
PRELIMINARY
Low Voltage Synchronous Buck Controller
FEATURES
鈥?/div>
Resistor Programmable 1.25V to 4.5V
V
OUT
鈥?/div>
2.5V to 6V Input Supply Range
鈥?/div>
1% DC Accuracy
鈥?/div>
High Efficiency Synchronous
Switching
鈥?/div>
Drives P-channel (High Side) and
N-channel (Low Side) MOSFETs
鈥?/div>
Lossless Programmable Current Limit
鈥?/div>
Logic Compatible Shutdown
鈥?/div>
Programmable Frequency
鈥?/div>
Start-up Voltage Tracking Protects
Dual Rail Microprocessors
DESCRIPTION
The UCC2585/UCC3585 synchronous Buck controller provides flexible
high efficiency power conversion for output voltages as low as 1.25V with
guaranteed 鹵1% DC accuracy. Output currents are only limited by the
choice of external logic level MOSFETs. With an input voltage range of
2.5V to 6.0V it is the ideal choice for 3.3V only, battery input, or other low
voltage systems. Applications include local microprocessor core voltage
power supplies for desktop and Notebook computers, and high speed GTL
bus regulation. Its fixed frequency oscillator is capable of providing practical
PWM operation to 700kHz.
With its low voltage capability and inherent 鈥渁lways on鈥?operation, the
UCC2585/UCC3585 causes VOUT to track VIN once VIN has exceeded
the threshold voltage of the external P channel MOSFET. Tracking can be
tailored for any application with a single resistor or disabled by connecting
TRACK to VIN. For dual supply rail microprocessors this feature negates
the need for external diodes to insure supply voltage tracking between the
+3.3V and lower voltage microprocessor core supplies.
(continued)
TYPICAL APPLICATION DIAGRAM
VIN
C8
0.47碌F
R1
10k
+
C1
150碌F
+
C2
150碌F
C7
147pF
1
R2
549k
2
COMP
ISENSE 11
R6
3
4
VFB
NDRV
14
Q2
IRF7401
+
C9
220碌F
C4
3.2N
C5
0.22碌F
C6
470pF
16
CT
PWRGND 13
10
SD
TRACK
6
R12
32k
R10
36k
+
C10
220碌F
+
C11
220碌F
ENB
PDRV
12
15
VIN
CLSET
8
R5
3
Q1
IRF7404
L1 4.7碌F
VOUT
R3
27.4k
3
SS
N/C
9
7
R4
100k
RTN
ISET
GND
5
R11
82k
RTN
UDG-98024
07/99

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