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EL7551CUZ-T13

P1-P3P4-P6P7-P9
1
®
FN7291.1
EL7551
Monolithic 1Amp DC:DC Step-down
Regulator
The EL7551 is an integrated, synchronous step-down
regulator with output voltage adjustable from 1.0V to 3.8V. It
is capable of delivering 1A continuous current at up to 95%
efficiency. The EL7551 operates at a constant frequency
pulse width modulation (PWM) mode, making external
synchronization possible. Patented on-chip resistorless
current sensing enables current mode control, which
provides cycle-by-cycle current limiting, over-current
protection, and excellent step load response. The EL7551 is
available in a fused-lead 16-pin QSOP package. With proper
external components, the whole converter fits into a less
than 0.4 in
2
area. The minimal external components and
small size make this EL7551 ideal for desktop and portable
applications.
The EL7551 is specified for operation over the -40°C to
+85°C temperature range.
Pinout
EL7551
(16-PIN QSOP)
TOP VIEW
Features
• Integrated synchronous MOSFETs and current mode
controller
• 1A continuous output current
• Up to 95% efficiency
• 4.5V to 5.5V input voltage
• Adjustable output from 1V to 3.8V
• Cycle-by-cycle current limit
• Precision reference
• ±0.5% load and line regulation
• Adjustable switching frequency to 1.2MHz
• Oscillator synchronization possible
• Internal soft start
• Over temperature protection
• Under voltage lockout
• 16-pin QSOP package
• Pb-free plus anneal available (RoHS compliant)
Applications
• DSP, CPU Core and IO Supplies
• Logic/Bus Supplies
• Portable Equipment
• DC:DC Converter Modules
• GTL + Bus Power Supply
Manufactured under U.S. Patent No. 57,323,974
1
2
3
4
16
15
14
13
5
6
7
12
11
10
8 9
SGND
COSC
VDD
PGND
PGND
VIN
VIN
EN
PGND
VREF
FB
VDRV
LX
LX
VHI
PGND
R3 R2
L1
C3 C4
C1
C5
R1
C6
C
7
V
O
(3.3V,1A)
V
IN
(4.5V-5.5V)
2.37kΩ
10µH
1kΩ
0.1µF
47µF
0.1µF
0.1µF270pF
39Ω
10µF
ceramic
Ordering Information
PART NUMBER
PART
MARKING PACKAGE
TAPE &
REEL
PKG.
DWG. #
EL7551CU 7551CU 16-Pin QSOP - MDP0040
EL7551CU-T7 7551CU 16-Pin QSOP 7” MDP0040
EL7551CU-T13 7551CU 16-Pin QSOP 13” MDP0040
EL7551CUZ
(See Note)
7551CUZ 16-Pin QSOP
(Pb-free)
- MDP0040
EL7551CUZ-T7
(See Note)
7551CUZ 16-Pin QSOP
(Pb-free)
7” MDP0040
EL7551CUZ-T13
(See Note)
7551CUZ 16-Pin QSOP
(Pb-free)
13” MDP0040
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.
Data Sheet March 21, 2006
N
O
T
R
E
C
O
M
M
E
N
D
E
D
F
O
R
N
E
W
D
E
S
I
G
N
S
S
E
E
E
L
7
5
3
1
O
R
E
L
7
5
3
6
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
| Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2002, 2003, 2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
2
Absolute Maximum Ratings (T
A
= 25°C)
Supply Voltage between V
IN
or V
DD
and GND . . . . . . . . . . . . +6.5V
V
LX
Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .V
IN
+0.3V
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . GND -0.3V, V
DD
+0.3V
V
HI
Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . GND -0.3V, V
LX
+6V
Storage Temperature. . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Operating Ambient Temperature . . . . . . . . . . . . . . . .-40°C to +85°C
Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . +135°
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
DC Electrical Specifications V
DD
= V
IN
= 5V, T
A
= T
J
= 25°C, C
OSC
= 1.2nF, unless otherwise specified.
PARAMETER DESCRIPTION CONDITIONS MIN TYP MAX UNIT
V
REF
Reference Accuracy 1.24 1.26 1.28 V
V
REFTC
Reference Temperature Coefficient 50 ppm/°C
V
REFLOAD
Reference Load Regulation 0 < I
REF
< 50µA -1 %
V
RAMP
Oscillator Ramp Amplitude 1.15 V
I
OSC_CHG
Oscillator Charge Current 0.1V < V
OSC
< 1.25V 200 µA
I
OSC_DIS
Oscillator Discharge Current 0.1V < V
OSC
< 1.25V 8 mA
I
VDD
+V
DRV
V
DD
+V
DRV
Supply Current V
EN
= 4V, F
OSC
= 120kHz 3.5 5 mA
I
VDD_OFF
V
DD
Standby Current EN = 0 1 1.5 mA
V
DD_OFF
V
DD
for Shutdown 3.5 4 V
V
DD_ON
V
DD
for Startup 3.95 4.45 V
T
OT
Over Temperature Threshold 135 °C
T
HYS
Over Temperature Hysteresis 20 °C
I
LEAK
Internal FET Leakage Current EN = 0, L
X
= 5V (low FET), L
X
= 0V (high FET) 10 µA
I
LMAX
Peak Current Limit 2 A
R
DSON
FET On Resistance Wafer level test only 45 95 mΩ
R
DSONTC
R
DSON
Tempco 0.2 mΩ/°C
V
FB
Output Initial Accuracy I
LOAD
= 0A 0.960 0.975 0.99 V
V
FB_LINE
Output Line Regulation V
IN
= 5V, ∆V
IN
= 10%, I
LOAD
= 0A 0.5 %
V
FB_LOAD
Output Load Regulation 0.1A < I
LOAD
< 1A 0.5 %
V
FB_TC
Output Temperature Stability -40°C < T
A
< 85°C, I
LOAD
= 0.5A ±1 %
I
FB
Feedback Input Pull Up Current V
FB
= 0V 100 200 nA
V
EN_HI
EN Input High Level 3.2 4 V
V
EN_LO
EN Input Low Level 1 V
I
EN
Enable Pull Up Current V
EN
= 0 -4 -2.5 µA
EL7551
3
Closed-Loop AC Electrical Specifications V
S
= V
IN
= 5V, T
A
= T
J
= 25°C, C
OSC
= 1.2nF, unless otherwise specified.
PARAMETER DESCRIPTION CONDITIONS MIN TYP MAX UNIT
F
OSC
Oscillator Initial Accuracy 105 117 130 kHz
t
SYNC
Minimum Oscillator Sync Width 25 ns
M
SS
Soft Start Slope 0.5 V/ms
t
BRM
FET Break Before Make Delay 15 ns
t
LEB
High Side FET Minimum On Time 150 ns
D
MAX
Maximum Duty Cycle 95 %
Pin Descriptions
PIN
NUMBER PIN NAME PIN FUNCTION
1 SGND Control circuit negative supply.
2 COSC Oscillator timing capacitor. FOSC can be approximated by: FOSC (kHz) = 0.1843/COSC, COSC in µF.
3 VDD Control circuit positive supply.
4 PGND Ground return of the regulator. Connected to the source of the low-side synchronous NMOS power FET.
5 PGND Ground return of the regulator. Connected to the source of the low-side synchronous NMOS power FET.
6 VIN Power supply input of the regulator. Connected to the drain of the high-side NMOS power FET.
7 VIN Power supply input of the regulator. Connected to the drain of the high-side NMOS power FET.
8 EN Chip Enable, active high. A 2µA internal pull-up current enables the device if the pin is left open.
9 PGND Ground return of the regulator.
10 VHI Positive supply of the high-side driver.
11 LX Inductor drive pin. High current digital output whose average voltage equals the regulator output voltage.
12 LX Inductor drive pin. High current digital output whose average voltage equals the regulator output voltage.
13 VDRV Positive supply of the low-side driver and input voltage for the high-side boot strap.
14 FB Voltage feedback input. Connected to an external resistor divider between VOUT and GND. A 125nA pull-up current
forces VOUT to VS in the event that FB is floating.
15 VREF Bandgap reference bypass capacitor. Typically 0.1µF to GND.
16 PGND Ground return of the regulator.
EL7551
P1-P3P4-P6P7-P9

EL7551CUZ-T13

Mfr. #:
Buy EL7551CUZ-T13
Manufacturer:
Renesas / Intersil
Description:
IC REG BUCK ADJUSTABLE 1A 16QSOP
Lifecycle:
New from this manufacturer.
Delivery:
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