UCC2585 Controller Datasheet

UCC2585 Datasheet, PDF, Equivalent


Part Number

UCC2585

Description

Low Voltage Synchronous Buck Controller

Manufacture

etcTI

Total Page 16 Pages
Datasheet
Download UCC2585 Datasheet


UCC2585
UCC3585 Not Recommended for New Designs
UCC2585
UCC3585
SLUS304F − JULY 1999 − REVISED JANUARY 2005
LOWĆVOLTAGE SYNCHRONOUS
BUCK CONTROLLER
FEATURES
D VOUT Resistor Programmable Down to 0.9 V
D 3.3-V or 5.0-V Input Supply
D 1% DC Accuracy
D High Efficiency Synchronous Switching
D Drives P-Channel (High Side) and N-Channel
(Low Side) MOSFETs
D Lossless Programmable Current Limit
D Logic Compatible Shutdown
APPLICATIONS
D Local Microprocessor Core Voltage Power
Supplies for Desktop and Notebook
Computers
D DSP Core or I/O Powering
D High-Speed GTL Bus Regulation
DESCRIPTION
The UCC3585 synchronous buck controller
provides flexible high efficiency power conversion
for output voltages as low as 0.9 V with ensured
±1% dc accuracy. With an input voltage range of
3.0 V to 5.5 V, it is the ideal choice for 3.3 V only,
5.0 V only, or other low voltage systems. The fixed
frequency oscillator is capable of providing
practical PWM operation to 500 kHz.
The UCC3585 drives a complementary pair of
power MOSFET transistors. A P-channel on the
high side, and an N-channel on the low side step
down the input voltage at up to 90% efficiency.
A programmable two-level current limiting
function is provided by sensing the voltage drop
across the high side P-channel MOSFET. This
circuit can be configured to provide pulse-
by-pulse limiting, timed shutdown after seven
consecutive faults, or latch-off after fault detec-
tion, allowing maximum application flexibility. The
current limit threshold can be programmed over a
wide range with a single resistor.
VIN
ENABLE
+
C1
150 µ F
R1
10 k
C7
0.47 µ F
UCC3585
15 VIN
CLSET 8
C2 5600 pF R2 10 k
C3 47 pF
1 ENB
PDRV 12
2 COMP ISENSE 11
4 VFB
NDRV 14
R4
14 k
Q1
SI4562DY
RTN
C4 0.47 µ F
10 SD
3 SS
C5 0.1 µ F
C6 470 pF
16 CT
7 ISET
R3 100 k
N/C 6
N/C 9
PWRGND 13
GND 5
VIN = 3.3 V
VOUT = 1.8 V
IOUT = 3 A (max)
L1
3.7 µ H
VOUT
+
C8
150 µ F
+
C9
10 µ F
R5
2 k
R6
2 k
RTN
UDG−01127
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
www.ti.com
Copyright 2001, Texas Instruments Incorporated
1

UCC2585
UCC2585
UCC3585
UCC3585 Not Recommended for New Designs
SLUS304F − JULY 1999 − REVISED JANUARY 2005
description (continued)
The UCC3585 also includes undervoltage lockout, a logic controlled enable, and softstart functions. The
UCC3585 is offered in the 16-pin surface mount and through-hole packages.
absolute maximum ratings over operating free-air temperature (unless otherwise noted)}
Analog pins
Minimum and maximum forced voltage (reference to GND) . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to 6.3 V
Digital pins
Minimum and maximum forced voltage (reference to GND) . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to 6.3 V
Power driver output pins
Maximum forced current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±1.0 A
Operating junction temperature, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55°C to 125°C
Storage temperature, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
} Unless otherwise noted, voltages are reference to ground and currents are positive into, negative out of, the specified terminals. Pulsed is defined
as a less than 10% duty cycle with a maximum duration of 500 ns.
N, D and M PACKAGES
(TOP VIEW)
ENB
COMP
SS
VFB
GND
N/C
ISET
CLSET
1
2
3
4
5
6
7
8
16 CT
15 VIN
14 NDRV
13 PWRGND
12 PDRV
11 ISENSE
10 SD
9 N/C
AVAILABLE OPTIONS
PACKAGED DEVICES
TA
DIL (N)
SOIC (D)
QSOP (M)
−40°C to 85°C
UCC2585N
UCC2585D
UCC2585M
0°C to 85°C
UCC3585N
UCC3585D
UCC3585M
The M and D packages are available taped and reeled. Add an R suffix to the device
type (e.g., UCC3585DR).
PACKAGE
N
D
M
DISSIPATION RATING TABLE
TA 25°C
POWER RATING
1.1 W
830 mW
580 mW
DERATING FACTOR
ABOVE TA = 25°C
11 mW/°C
8.3 mW/°C
5.8 mW/°C
TA = 70°C
POWER RATING
610 mW
450 mW
320 mW
TA = 85°C
POWER RATING
440 mW
330 mW
230 mW
2 www.ti.com


Features UCC3585 Not Recommended for New Designs UCC2585 UCC3585 SLUS304F − JULY 199 9 − REVISED JANUARY 2005 LOWĆVOLTAGE SYNCHRONOUS BUCK CONTROLLER FEATURES D VOUT Resistor Programmable Down to 0. 9 V D 3.3-V or 5.0-V Input Supply D 1% DC Accuracy D High Efficiency Synchrono us Switching D Drives P-Channel (High S ide) and N-Channel (Low Side) MOSFETs D Lossless Programmable Current Limit D Logic Compatible Shutdown APPLICATIONS D Local Microprocessor Core Voltage Pow er Supplies for Desktop and Notebook Co mputers D DSP Core or I/O Powering D Hi gh-Speed GTL Bus Regulation DESCRIPTIO N The UCC3585 synchronous buck controll er provides flexible high efficiency po wer conversion for output voltages as l ow as 0.9 V with ensured ±1% dc accura cy. With an input voltage range of 3.0 V to 5.5 V, it is the ideal choice for 3.3 V only, 5.0 V only, or other low vo ltage systems. The fixed frequency osci llator is capable of providing practica l PWM operation to 500 kHz. The UCC3585 drives a complementary pair o.
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