EL7551 Datasheet, PDF (1/9 Pages) Intersil Corporation – Monolithic 1Amp DC:DC Step-down Regulator

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January 24, 2002
EL7551
FN7291
Monolithic 1Amp DC:DC Step-down
Regulator
The EL7551 is an integrated,
synchronous step-down regulator with
output voltage adjustable from 1.0V to
3.8V. It is capable of delivering 1A continuous current at up
to 95% efficiency. The EL7551 operates at a constant
frequency pulse width modulation (PWM) mode, making
external synchronization possible. Patented on-chip
resistorless current sensing enables current mode control,
which provides cycle-by-cycle current limiting, over-current
protection, and excellent step load response. The EL7551 is
available in a fused-lead 16-pin QSOP package. With proper
external components, the whole converter fits into a less
than 0.4 in² area. The minimal external components and
small size make this EL7551 ideal for desktop and portable
applications.
The EL7551 is specified for operation over the -40°C to
+85°C temperature range.
Pinout
EL7551
(16-PIN QSOP)
TOP VIEW
C3 C4
0.1µF 270pF
R3
39Ω
C1
10µF
ceramic
V_IN
(4.5V-5.5V)
1 SGND PGND 16
2 COSC VREF 15
3 VDD
FB 14
4 PGND VDRV 13
5 PGND
LX 12
6 VIN
LX 11
7 VIN
VHI 10
8 EN
PGND 9
C5
0.1µF _R2
R1 _2.37kΩ
1kΩ
L1
10µH
C6
0.1µF
C₇
V_O
47µF (3.3V,1A)
Features
• Integrated synchronous MOSFETs and current mode
controller
• 1A continuous output current
• Up to 95% efficiency
• 4.5V to 5.5V input voltage
• Adjustable output from 1V to 3.8V
• Cycle-by-cycle current limit
• Precision reference
• ±0.5% load and line regulation
• Adjustable switching frequency to 1.2MHz
• Oscillator synchronization possible
• Internal soft start
• Over temperature protection
• Under voltage lockout
• 16-pin QSOP package
Applications
• DSP, CPU Core and IO Supplies
• Logic/Bus Supplies
• Portable Equipment
• DC:DC Converter Modules
• GTL + Bus Power Supply
Ordering Information
PART NUMBER PACKAGE TAPE & REEL
EL7551CU
16-Pin QSOP
-
EL7551CU-T7 16-Pin QSOP
7”
EL7551CU-T13 16-Pin QSOP
13”
PKG. NO.
MDP0040
MDP0040
MDP0040
Manufactured under U.S. Patent No. 57,323,974
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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