EL7531
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D E D U TE P R 0 6
EN
91
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) ISL Data Sheet
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July 13, 2006
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 VIN 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.
FN7428.9
Features
• Less than 0.15 in2 (0.97 cm2) 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
The EL7531 is available in the 10 Ld MSOP package,
making the entire converter occupy less than 0.15 in2 of
PCB area with components on one side only. The 10 Ld
MSOP package is specified for operation over the full -40°C
to +85°C temperature range.
• Pb-Free plus anneal available (RoHS compliant)
Applications
• PDA and pocket PC computers
Ordering Information
PART
PART NUMBER MARKING
• External synchronizable up to 12MHz
TAPE &
REEL
PACKAGE
PKG.
DWG. #
EL7531IY
BEAAA
-
10 Ld MSOP
MDP0043
EL7531IY-T7
BEAAA
7”
10 Ld MSOP
MDP0043
EL7531IY-T13
BEAAA
13”
10 Ld MSOP
MDP0043
EL7531IYZ
(Note)
BHAAA
-
10 Ld MSOP
(Pb-free)
MDP0043
EL7531IYZ-T7
(Note)
BHAAA
7”
10 Ld MSOP
(Pb-free)
MDP0043
EL7531IYZ-T13
(Note)
BHAAA
10 Ld MSOP
(Pb-free)
• Bar code readers
• Cellular phones
MDP0043
13”
• Portable test equipment
• Li-Ion battery powered devices
• Small form factor (SFP) modules
Typical Application Diagram
EL7531
TOP VIEW
VS
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.
(2.5V to 5.5V)
VIN
R3 100Ω
C2
10µF
LX
EL7531
R5 100kΩ
R1*
124kΩ
PG
Pinout
EN
EL7531 (10 LD MSOP)
TOP VIEW
1 SGND
FB 10
2 PGND
PG 8
4 VIN
R6
100kΩ
FB
SYNC
PGND
SGND
R2*
100kΩ
VO 9
3 LX
R4 100kΩ
1.8µH
C1
10µF
VDD
C3
0.1µF
VO
L1
C4
470pF
EN 7
5 VDD
VO
(1.8V @ 1A)
* VO = 0.8V * (1 + R1 / R2)
SYNC 6
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Copyright © Intersil Americas Inc. 2004, 2005, 2006. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
