intersil EL7536 DATA SHEET

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July 13, 2006

EL7536

FN7396.8

Monolithic 1A Step-Down Regulator

The EL7536 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

with a resistive

IN

divider.
The EL7536 features PWM mode control. The operating

frequency is typically 1.4MHz. Additional features include a
100ms Power-On-Reset output, <1µA shut-down current,
short-circuit protection, and over-temperature protection.

The EL7536 is available in the 10 Ld MSOP package,
making the entire converter occupy less than 0.15in

2

of PCB
area with components on one side only. Both packages are
specified for operation over the full -40°C to +85°C
temperature range.

Ordering Information

PART NUMBER

(BRAND)

EL7536IY BDAAA - 10 Ld MSOP MDP0043
EL7536IY-T7 BDAAA 7” 10 Ld MSOP MDP0043
EL7536IY-T13 BDAAA 13” 10 Ld MSOP MDP0043
EL7536IYZ

(Note)
EL7536IYZ-T7

(Note)
EL7536IYZ-T13

(Note)

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.

PART

MARKING

BFAAA - 10 Ld MSOP

BFAAA 7” 10 Ld MSOP

BFAAA 13” 10 Ld MSOP

TAPE &

REEL PACKAGE

(Pb-free)

(Pb-free)

(Pb-free)

PKG.

DWG. #

MDP0043

MDP0043

MDP0043

Pinout

EL7536 (10 LD MSOP)

TOP VIEW

Features

• Less than 0.15in2 (0.97cm2) footprint for the complete 1A
converter

• Components on one side of PCB

• Max height 1.1mm MSOP10

• 100ms Power-On-Reset output (POR)

• Internally-compensated voltage mode controller

• Up to 94% efficiency

• <1µA shut-down current

• Overcurrent and over-temperature protection

• Pb-free plus anneal available (RoHS compliant)

Applications

• PDA and pocket PC computers

• Bar code readers

• Cellular phones

• Portable test equipment

• Li-Ion battery powered devices

• Small form factor (SFP) modules

Typical Application Diagram

EL7536

TOP VIEW

V

S

C

10µF

(2.5V to 5.5V)

R3 100Ω

2

100kΩ

R

5

R4 100kΩ

100kΩ

C

0.1µF

R

L

VIN

VDD

3

EL7536

POR

EN

RSI

6

PGND
SGND

LX

FB

VO

1

1.8µH

10µF

R1*

124kΩ

R

100kΩ

C

1

*

2

(1.8V @ 1A)

C

470pF

4

V

O

SGND FB

1

PGND VO

2

LX POR

3

4

VIN EN

5 6

VDD RSI

1

10

9

8

7

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 1-888-468-3774

All other trademarks mentioned are the property of their respective owners.

* V

= 0.8V * (1 + R1 / R2)

O

| Intersil (and design) is a registered trademark of Intersil Americas Inc.

Copyright © Intersil Americas Inc. 2003-2006. All Rights Reserved.

EL7536

Absolute Maximum Ratings (T

V

, VDD, POR to SGND. . . . . . . . . . . . . . . . . . . . . . -0.3V to +6.5V

IN

LX to PGND. . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to (V

RSI, EN, V

, FB to SGND. . . . . . . . . . . . . . . -0.3V to (VIN + +0.3V)

O

= 25°C)

A

+ +0.3V)

IN

Operating Ambient Temperature . . . . . . . . . . . . . . . .-40°C to +85°C

Storage Temperature. . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C

Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+125°C

PGND to SGND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +0.3V

Peak Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2A

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. Typ values are for information purposes only . Unless otherwise noted, all tests are
at the specified temperature and are pulsed tests, therefore: T

Electrical Specifications V

DD

= V

IN

= TC = T

J

A

= VEN = 3.3V, C1 = C2 = 10µF, L = 1.8µH, VO = 1.8V, unless otherwise specified.

PARAMETER DESCRIPTION CONDITIONS MIN TYP MAX UNIT

DC CHARACTERISTICS

V

FB

I

FB

V

, V

IN

DD

V

IN,OFF

V

IN,ON

I

DD

R

DS(ON)-PMOS

R

DS(ON)-NMOS

I

LMAX

T

OT,OFF

T

OT,ON

I

, I

EN

RSI

V

, V

EN1

RSI1

V

, V

EN2

RSI2

V

POR

V

OLPOR

Feedback Input Voltage 790 800 810 mV
Feedback Input Current 250 nA
Input Voltage 2.5 5.5 V
Minimum Voltage for Shutdown VIN falling 2 2.2 V
Maximum Voltage for Startup VIN rising 2.2 2.4 V
Supply Current PWM, VIN = VDD = 5V 400 500 µA

EN = 0, V

= VDD = 5V 0.1 1 µA

IN

PMOS FET Resistance VDD = 5V, wafer test only 70 100 mΩ
NMOS FET Resistance VDD = 5V, wafer test only 45 75 mΩ
Current Limit 1.5 A
Over-temperature Threshold T rising 145 °C
Over-temperature Hysteresis T falling 130 °C
EN, RSI Current VEN, V

= 0V and 3.3V -1 1 V

RSI

EN, RSI Rising Threshold VDD = 3.3V 2.4 V
EN, RSI Falling Threshold VDD = 3.3V 0.8 V
Minimum VFB for POR, WRT Targeted

V

Value

FB

POR Voltage Drop I

rising 95 %

V

FB

falling 86 %

V

FB

= 5mA 35 70 mV

SINK

AC CHARACTERISTICS

F
t

RSI

t

SS

t

POR

PWM

PWM Switching Frequency 1.4 1.5 1.75 MHz
Minimum RSI Pulse Width Guaranteed by design 25 50 ns
Soft-start Time 650 µs
Power On Reset Delay Time 80 100 120 ms

2

FN7396.8

July 13, 2006

EL7536

Pin Descriptions

PIN NUMBER PIN NAME PIN FUNCTION

1 SGND Negative supply for the controller stage
2 PGND Negative supply for the power stage
3 LX Inductor drive pin; high current digital output with average voltage equal to the regulator output voltage
4 VIN Positive supply for the power stage
5 VDD Power supply for the controller stage
6 RSI Resets POR timer
7 EN Enable
8 POR Power on reset open drain output
9 VO Output voltage sense

10 FB Voltage feedback input; connected to an external resistor divider between V

output

Block Diagram

and SGND for variable

O

EN

2.5V-

3.5V

10µF

+
–

124K

100K

V

DD

V

O

FB

EN

BANDGAP

REFERENCE

SGND

RSI

5M

CLOCK

1.4MHz

SOFT-

START

10pF

-

+

PWM

COMPEN-

SATION

RAMP

GENERATOR

UNDER­VOLTAGE
LOCKOUT

POR

+

-

PWM

COMPARATOR

TEMPERATURE

SENSE

CONTROL

LOGIC

+

-

CURRENT

LIMIT

P-DRIVER

N-DRIVER

V

LX

PGND

POR

IN

1.8µ

1.8V
1A

10µF

100K

PG

3

FN7396.8

July 13, 2006