®
EL7531
Data Sheet
August 5, 2005
FN7428.6
Monolithic 1A Step-Down Regulator with
Low Quiescent Current
The EL7531 is a synchronous, integrated FET 1A step-down
regulator with internal compensation. It operates with an
input voltage range from 2.5V to 5.5V, which accommodates
supplies of 3.3V, 5V, or a Li-Ion battery source. The output
can be externally set from 0.8V to V
IN
with a resistive
divider.
The EL7531 features automatic PFM/PWM mode control, or
PWM mode only. The PWM frequency is typically 1.4MHz
and can be synchronized up to 12MHz. The typical no load
quiescent current is only 120µA. Additional features include
a Power-Good output, <1µA shut-down current, short-circuit
protection, and over-temperature protection.
The EL7531 is available in the 10-pin MSOP package,
making the entire converter occupy less than 0.15 in
2
of
PCB area with components on one side only. The 10-pin
MSOP package is specified for operation over the full -40°C
to +85°C temperature range.
Features
• Less than 0.15 in
2
(0.97 cm
2
) footprint for the complete 1A
converter
• Components on one side of PCB
• Max height 1.1mm MSOP10
• Power-Good (PG) output
• Internally-compensated voltage mode controller
• Up to 94% efficiency
• <1µA shut-down current
• 120µA quiescent current
• Overcurrent and over-temperature protection
• External synchronizable up to 12MHz
• Pb-Free plus anneal available (RoHS compliant)
Applications
• PDA and pocket PC computers
• Bar code readers
Ordering Information
PART NUMBER
(BRAND)
EL7531IY
(BEAAA)
EL7531IY-T7
(BEAAA)
EL7531IY-T13
(BEAAA)
EL7531IYZ
(BHAAA) (Note)
EL7531IYZ-T7
(BHAAA) (Note)
EL7531IYZ-T13
(BHAAA) (Note)
PACKAGE
10-Pin MSOP
10-Pin MSOP
10-Pin MSOP
10-Pin MSOP
(Pb-free)
10-Pin MSOP
(Pb-free)
10-Pin MSOP
(Pb-free)
TAPE &
REEL
-
7”
13”
-
7”
13”
PKG.
DWG. #
MDP0043
MDP0043
MDP0043
MDP0043
MDP0043
MDP0043
• Cellular phones
• Portable test equipment
• Li-Ion battery powered devices
• Small form factor (SFP) modules
Pinout and Typical Application Diagram
EL7531
TOP VIEW
1
SGND
C
1
10µF
C
2
10µF
2
PGND
3
LX
4
VIN
5
VDD
FB
10
VO
9
PG
8
EN
7
SYNC
6
R
1
*
100kΩ
R
2
*
124kΩ
C
4
470pF
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100%
V
O
(1.8V@1A)
matte tin plate termination finish, which are RoHS compliant and
compatible with both SnPb and Pb-free soldering operations. Intersil
V
S
(2.5V-6V)
Pb-free products are MSL classified at Pb-free peak reflow
temperatures that meet or exceed the Pb-free requirements of
IPC/JEDEC J STD-020.
L
1
1.8µH
PG
EN
SYNC
R
6
100kΩ
R
3
100Ω
C
3
0.1µF
R
4
R
5
100kΩ
100kΩ
* V
O
= 0.8V * (1 + R
2
/ R
1
)
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
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Copyright © Intersil Americas Inc. 2004, 2005. All Rights Reserved.
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