1
FN7290.1
EL7512
High Frequency PWM Step-Up Regulator
The EL7512 is a high frequency, high efficiency step-up
DC:DC regulator operated at fixed frequency PWM mode.
With an integrated 1A MOSFET, it can deliver up to 600mA
output current at up to 90% efficiency. The adjustable
switching frequency is up to 1.2MHz, making it ideal for DSL
applications.
When shut down, it draws <3A of current. This feature,
along with the minimum starting voltage of 2V, makes it
suitable for portable equipment powered by one lithium ion
or 3 to 4 NiMH cells.
The EL7512 is available in a 10-pin MSOP package, with
maximum height of 1.1mm. With proper external
components, the whole converter takes less than 0.25in
2
PCB space.
This device is specified for operation over the full -40C to
+85C temperature range.
Pinout
EL7512
(10-PIN MSOP)
TOP VIEW
Features
90% efficiency
Up to 600mA I
OUT
5V < V
OUT
< 18V
V
IN
> 2V
Up to 1.2MHz adjustable frequency
< 3A shutdown current
Adjustable soft-start
Low battery detection
Internal thermal protection
1.1mm max height 10-pin MSOP package
Pb-Free available (RoHS compliant)
Applications
3V to 5V, 12V, and 18V converters
5V to 12V and 16V converters
TFT-LCD
DSL
Portable equipment
Desktop equipment
1
2
3
4
10
9
8
7
5
6
PGND
SGND
RT
EN
LBI
LX
VDD
FB
SS
LBO
47F
80.6k
10k
4.7nF
10H
100k
C
3
10F
V
IN
(2V-
9V)
V
OUT
(12V up
to
400mA)
20nF
C
10
R
1
R
2
D
1
C
5
1k
R
4
0.1F
C
4
C
1
L
1
R
3
Ordering Information
PART NUMBER
PACKAGE
TAPE &
REEL
PKG. DWG. #
EL7512CY
10-Pin MSOP
-
MDP0043
EL7512CY-T7
10-Pin MSOP
7"
MDP0043
EL7512CY-T13
10-Pin MSOP
13"
MDP0043
EL7512CYZ
(See Note)
10-Pin MSOP
(Pb-free)
-
MDP0043
EL7512CYZ-T7
(See Note)
10-Pin MSOP
(Pb-free)
7"
MDP0043
EL7512CYZ-T13
(See Note)
10-Pin MSOP
(Pb-free)
13"
MDP0043
NOTE: Intersil Pb-free 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.
Data Sheet
May 23, 2005
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-352-6832
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2002, 2003, 2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
2
Absolute Maximum Ratings
(T
A
= 25C)
EN, LBI, . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+18V
LX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20V
V
DD
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12V
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . -65C to +150C
Operating Temperature . . . . . . . . . . . . . . . . . . . . . . .-40C to +85C
Operating Junction Temperature:. . . . . . . . . . . . . . . . . . . . . . . 135C
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typical values are for information purposes only. Unless otherwise noted, all tests
are at the specified temperature and are pulsed tests, therefore: T
J
= T
C
= T
A
Electrical Specifications
V
IN
= 5V, V
OUT
= 12V, I
OUT
= 0mA, R
T
= 100k
, T
A
= 25C unless otherwise specified.
PARAMETER
DESCRIPTION
CONDITION
MIN
TYP
MAX
UNIT
IQ1
Quiescent Current - Shut-down
VEN = 0
3
A
IQ2
Quiensent Current
VEN = 2V
2.5
4
mA
VFB
Feedback Voltage
1.31
1.35
1.39
V
IB
Feedback Input Bias Current
0.10
A
V
IN
Input Voltage Range
2
V
D
MAX
Maximum Duty Cycle
84
90
%
I
LIM
Current Limit - Max Average Input
Current
1000
1250
1500
mA
I
SHDN
Shut-down Input Bias Current
1
A
V
LBI
LBI Threshold Voltage
180
220
250
mV
V
OL-LBO
LBO Output Low
ILBO = 1mA
0.1
0.2
V
I
LEAK-LBO
LBO Output Leakage Current
VLBI = 250mV, VLBO = 5V
0.02
1
A
R
DS-ON
Switch On Resistance
at 12V output
300
m
I
LEAK-SWITCH
Switch Leakage Current
1
A
V
OUT
/
V
IN
Line Regulation
3V < V
IN
< 6V, V
OUT
= 12V, no load
0.15
%/V
V
OUT
/
I
OUT
Load Regulation
I
OUT
< 250mA
0.5
%
F
OSC-MAX
Maximum Switching Frequency
R
T
= 49.9k
1200
kHz
F
OSC1
Switching Frequency
530
670
800
kHz
VHI_EN
EN Input High Threshold
1.6
V
VLO_EN
EN Input Low Threshold
0.5
V
Pin Descriptions
PIN NUMBER
PIN NAME
PIN FUNCTION
1
PGND
Power ground; connected to the source of internal N-channel power MOSFET
2
SGND
Signal ground; ground reference for all the control circuitry; needs to have only a single connection to PGND
3
RT
Timing resistor to adjust the oscillation frequency of the converter
4
EN
Chip enable; connects to logic HI (>1.6V) for chip to function
5
LBI
Low battery input; connects to a sensing voltage, or left open if function is not used
6
LBO
Low battery detection output; connected to the open drain of a MOSFET; able to sink 1mA current
7
SS
Soft-start; connects to a capacitor to control the start-up of the converter
8
FB
Voltage feedback input; needs to connect to resistor divider to decide V
O
9
VDD
Control circuit positive supply
10
LX
Inductor drive pin; connected to the drain of internal N-channel power MOSFET
EL7512
PDF 
ZIP
