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IRU3039CH Datasheet

  • IRU3039CH

  • SYNCHRONOUS PWM CONTROLLER WITH OVER CURRENT PROTECTION

  • 22頁

  • IRF

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Data Sheet No. PD94649
IRU3039
SYNCHRONOUS PWM CONTROLLER
WITH OVER CURRENT PROTECTION
FEATURES
Current Limit using Lower MOSFET Sensing
Using the 6V internal regulator for charge pump
circuit allows single supply operation up to 18V
Programmable Switching Frequency up to 400KHz
Soft-Start Function
0.8V Precision Reference Voltage Available
Uncommitted Error Amplifier Available for DDR
Voltage Tracking Applications
Stable with Ceramic Capacitor
DESCRIPTION
The IRU3039 controller IC is designed to provide a syn-
chronous Buck regulator and is targeted for applications
where the cost and size is critical. The IRU3039 oper-
ates with a single input supply up to 18V. The output
voltage can be programmed as low as 0.8V for low volt-
age applications. Selectable current limit is provided to
tailor to external MOSFET鈥檚 on-resistance for optimum
cost and performance. The IRU3039 features an uncom-
mitted error amplifier for tracking output voltage and is
capable of sourcing or sinking current for applications
such as DDR bus termination.
This device features a programmable switching frequency
set from 200KHz to 400KHz, under-voltage lockout for
both Vcc and Vc supplies, an external programmable
soft-start function as well as output under-voltage detec-
tion that latches off the device when an output short is
detected.
APPLICATIONS
DDR Memory V
DDQ
/V
TT
Applications
Graphic Card
Hard Disk Drive
Netcom on-board DC to DC regulator application
Output voltage as low as 0.8V
Low Cost On-Board DC to DC
TYPICAL APPLICATION
18V
D1
C3
1uF
C9
1uF
L1
1uH
C2
3x 15uF
25V
C4
1uF
C5
0.1uF
Q1
IRF7466
D2
R2
L2
4.7uH
Q2
IRF7458
R3
3.3V @ 8A
C1
15uF
Vcc
SS / SD
C7
0.1uF
V
OUT2
Vc
U1
HDrv
IRU3039
V
P
V
REF
Rt
Comp
OCSet
5.76K
LDrv
C6
2x 330uF
40m
V
C11
Optional
C8
5600pF
R1
14K
Gnd
PGnd
Fb
R4
1K
3.16K
Figure 1 - Typical application of IRU3039.
PACKAGE ORDER INFORMATION
T
A
(擄C)
0 To 70
Rev. 1.0
06/06/03
DEVICE
IRU3039CH
PACKAGE
20-Pin MLPQ 5x5 (H)
www.irf.com
1

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