EL7531
®
Data Sheet
August 5, 2005
FN7428.6
Monolithic 1A Step-Down Regulator with
Low Quiescent Current
Features
2
2
• Less than 0.15 in (0.97 cm ) footprint for the complete 1A
converter
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
• Components on one side of PCB
• Max height 1.1mm MSOP10
can be externally set from 0.8V to V with a resistive
• Power-Good (PG) output
IN
divider.
• Internally-compensated voltage mode controller
• Up to 94% efficiency
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.
• <1µA shut-down current
• 120µA quiescent current
• Overcurrent and over-temperature protection
• External synchronizable up to 12MHz
• Pb-Free plus anneal available (RoHS compliant)
The EL7531 is available in the 10-pin MSOP package,
2
making the entire converter occupy less than 0.15 in 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.
Applications
• PDA and pocket PC computers
• Bar code readers
Ordering Information
• Cellular phones
PART NUMBER
TAPE &
REEL
PKG.
(BRAND)
PACKAGE
DWG. #
• Portable test equipment
• Li-Ion battery powered devices
• Small form factor (SFP) modules
EL7531IY
(BEAAA)
10-Pin MSOP
-
MDP0043
MDP0043
MDP0043
MDP0043
MDP0043
MDP0043
EL7531IY-T7
(BEAAA)
10-Pin MSOP
10-Pin MSOP
7”
Pinout and Typical Application Diagram
EL7531IY-T13
(BEAAA)
13”
-
EL7531
TOP VIEW
EL7531IYZ
(BHAAA) (Note)
10-Pin MSOP
(Pb-free)
EL7531IYZ-T7
(BHAAA) (Note)
10-Pin MSOP
(Pb-free)
7”
R *
1
100kΩ
1
2
3
4
5
SGND
PGND
LX
FB 10
C
4
R *
2
124kΩ
EL7531IYZ-T13
(BHAAA) (Note)
10-Pin MSOP
(Pb-free)
13”
470pF
VO
PG
9
8
7
6
C
1
C
10µF
2
L
1
10µF
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100%
matte tin plate termination finish, which are RoHS compliant and
compatible with both SnPb and Pb-free soldering operations. Intersil
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.
PG
1.8µH
V
(1.8V@1A)
O
VIN
EN
EN
R
100Ω
3
V
(2.5V-6V)
S
VDD
SYNC
SYNC
C
3
R
6
0.1µF
100kΩ
R
R
100kΩ
100kΩ
4
5
* V = 0.8V * (1 + R / R )
O
2
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1
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Copyright © Intersil Americas Inc. 2004, 2005. All Rights Reserved.
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