EL7531 Datasheet, PDF (1/10 Pages) Intersil Corporation – Monolithic 1A Step-Down Regulator with Low Quiescent Current

®
Data Sheet
August 5, 2005
EL7531
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 in² 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 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
• External synchronizable up to 12MHz
• Pb-Free plus anneal available (RoHS compliant)
Applications
• PDA and pocket PC computers
Ordering Information
• Bar code readers
PART NUMBER
(BRAND)
EL7531IY
(BEAAA)
EL7531IY-T7
(BEAAA)
EL7531IY-T13
(BEAAA)
EL7531IYZ
(BHAAA) (Note)
PACKAGE
10-Pin MSOP
TAPE &
REEL
-
PKG.
DWG. #
MDP0043
10-Pin MSOP
7”
MDP0043
10-Pin MSOP
13”
MDP0043
10-Pin MSOP
(Pb-free)
-
MDP0043
• Cellular phones
• Portable test equipment
• Li-Ion battery powered devices
• Small form factor (SFP) modules
Pinout and Typical Application Diagram
EL7531
TOP VIEW
EL7531IYZ-T7
(BHAAA) (Note)
10-Pin MSOP
(Pb-free)
7”
MDP0043
EL7531IYZ-T13
10-Pin MSOP
13”
MDP0043
(BHAAA) (Note)
(Pb-free)
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
C₁
10µF
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 ^VS ^(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.
L₁
C₂
10µF
1.8µH
R₃
100Ω
C₃
0.1µF
1 SGND
2 PGND
FB 10
VO 9
R₁*
100kΩ
R₂*
124kΩ
C₄
470pF
3 LX
PG 8
PG
4 VIN
EN 7
EN
5 VDD SYNC 6
R₄ 100kΩ
SYNC
R₆
100kΩ
R₅ 100kΩ
* V_O = 0.8V * (1 + R₂ / R₁)
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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