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PDF EL7531 Data sheet ( Hoja de datos )
| Número de pieza | EL7531 | |
| Descripción | Monolithic 1A Step-Down Regulator with Low Quiescent Current | |
| Fabricantes | Intersil Corporation | |
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®
Data Sheet
September 30, 2004
EL7531
FN7428.4
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.
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.
Ordering Information
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
• Over-current and over-temperature protection
• External synchronizable up to 12MHz
• Pb-free Available
Applications
• PDA and pocket PC computers
• Bar code readers
PART
NUMBER
PACKAGE
TAPE & PKG.
REEL DWG. #
EL7531IY
10-Pin MSOP
- MDP0043
EL7531IY-T7
10-Pin MSOP
7” MDP0043
EL7531IY-T13
10-Pin MSOP
13” MDP0043
EL7531IYZ (Note) 10-Pin MSOP (Pb-free) - MDP0043
EL7531IYZ-T7 (Note) 10-Pin MSOP (Pb-free) 7” MDP0043
EL7531IYZ-T13
(Note)
10-Pin MSOP (Pb-free) 13” MDP0043
• Cellular phones
• Portable test equipment
• Li-Ion battery powered devices
• Small form factor (SFP) modules
Pinout and Typical Application Diagram
EL7531
TOP VIEW
NOTE: Intersil Pb-free products employ special Pb-free material
sets; molding compounds/die attach materials and 100% matte tin
plate termination finish, which is 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-020B.
C1
10µF
VO (1.8V@1A)
VS (2.5V-6V)
L1
C2
10µF
1.8µH
R3
100Ω
C3
0.1µF
1 SGND
2 PGND
3 LX
4 VIN
5 VDD
FB 10
VO 9
PG 8
EN 7
RSI 6
R4 100kΩ
R1*
100kΩ
R2*
124kΩ
C4
470pF
PG
EN
SYNC
R6
100kΩ
R5 100kΩ
* VO = 0.8V * (1 + R2 / R1)
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2004. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
1 page  
EL7531
Performance Curves and Waveforms (Continued)
All waveforms are taken at VIN=3.3V, VO=1.8V, IO=1A with component values shown on page 1 at room ambient temperature, unless otherwise
noted.
0.1%
0.0%
-0.1%
-0.2%
VIN=3.3V IO=0A
VIN=5V IO=0A
-0.3%
-0.4%
VIN=3.3V IO=1A
-0.5%
-0.6%
VIN=5V IO=1A
-0.7%
-50
0 50 100 150
TJ (°C)
FIGURE 7. PWM MODE LOAD/LINE REGULATIONS vs
JUNCTION TEMPERATURE
12
10
8
6
4
2
0
2.5 3 3.5 4 4.5 5
VS (V)
FIGURE 8. NO LOAD QUIESCENT CURRENT (PWM MODE)
140
130
VO=1.8V
VO=3.3V
120
110
100 VO=1.5V
90
VO=1.2V VO=1.0V
VO=0.8V
80
70
60
50
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
VS (V)
FIGURE 9. NO LOAD QUIESCENT CURRENT (PFM MODE)
100
1.4MHz
80
5MHz
12MHz
60
40
20
0
0 200 400 600 800 1K 1.2K
IO (mA)
FIGURE 10. EFFICIENCY vs IO (PWM MODE)
1
12MHz
0.6
1.4MHz
0.2
5MHz
0
-0.2
-0.6
0
200 400 600 800 1K 1.2K
IO (mA)
FIGURE 11. LOAD REGULATION (PWM MODE)
5
0.5
0.3
0.1
1.4MHz
-0.1
12MHz
-0.3 5MHz
-0.5
2.5 3 3.5 4 4.5 5 5.5
VIN (V)
FIGURE 12. LINE REGULATION @ 500mA (PWM MODE)
FN7428.4
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet EL7531.PDF ] | |
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