DATASHEET
ISL8014A
FN7525
Rev 2.00
4A Low Quiescent Current 1MHz High Efficiency Synchronous Buck Regulator
December 16, 2014
The ISL8014A is a high efficiency, monolithic, synchronous
Features
step-down DC/DC converter that can deliver up to 4A
High efficiency synchronous buck regulator with up to 97%
continuous output current from a 2.8V to 5.5V input supply. It
efficiency
uses a current control architecture to deliver very low duty
cycle operation at high frequency with fast transient response Power-good (PG) output with a 1ms delay
and excellent loop stability.
2.8V to 5.5V supply voltage
The ISL8014A integrates a pair of low ON-resistance P-Channel
3% output accuracy over-temperature/load/line
and N-Channel internal MOSFETs to maximize efficiency and
4A output current
minimize external component count. The 100% duty-cycle
Pin compatible to ISL8013A
operation allows less than 400mV dropout voltage at 4A
output current. High 1MHz pulse-width modulation (PWM)
Start-up with prebiased output
switching frequency allows the for use of small external
Internal soft-start - 1ms
components and the SYNC input enables multiple ICs to
Soft-stop output discharge during disabled
synchronize out-of-phase to reduce ripple and eliminate beat
frequencies. 35A quiescent supply current in PFM mode
Selectable forced PWM mode and PFM mode
The ISL8014A can be configured for discontinuous or forced
continuous operation at light load. Forced continuous
External synchronization up to 4MHz
operation reduces noise and RF interference while
Less than 1A logic controlled shutdown current
discontinuous mode provides high efficiency by reducing
100% maximum duty cycle
switching losses at light loads.
Internal current mode compensation
Fault protection is provided by internal hiccup mode current
limiting during short circuit and overcurrent conditions, an Peak current limiting and hiccup mode short-circuit
protection
output overvoltage comparator and over-temperature monitor
circuit. A power-good output voltage monitor indicates when
Over-temperature protection
the output is in regulation.
Small 16 Ld 4mmx4mm QFN
The ISL8014A is offered in a space saving 4mmx4mm QFN,
Pb-Free (RoHS compliant)
lead free package with exposed pad lead frames for low
thermal resistance.
Applications
The ISL8014A offers a 1ms power-good (PG) timer at
DC/DC POL modules
power-up. When shutdown, ISL8014A discharges the output
C/P, FPGA and DSP power
capacitor. Other features include internal soft-start, internal
Plug-in DC/DC modules for routers and switchers
compensation, overcurrent protection, and thermal shutdown.
Portable instruments
The ISL8014A is offered in a 16 Ld 4mmx4mm QFN package
with 1mm maximum height. The complete converter occupies Test and measurement systems
2
less than 0.4in area.
Li-ion battery powered devices
Small form factor (SFP) modules
Barcode readers
FN7525 Rev 2.00 Page 1 of 16
December 16, 2014ISL8014A
Ordering Information
TEMP.
PART NUMBER PART RANGE PACKAGE PKG.
(Notes 1, 2, 3) MARKING (C) (Pb-Free) DWG. #
ISL8014AIRZ 80 14AIRZ -40 to +85 16 Ld 4x4 QFN L16.4x4
ISL8014AEVAL2Z Evaluation Board
NOTES:
1. Add -T* suffix for tape and reel. Please refer to TB347 for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte
tin plate plus anneal (e3 termination finish, which is 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.
3. For Moisture Sensitivity Level (MSL), please see device information page for ISL8014A. For more information on MSL please see tech brief TB363.
Pin Configuration
ISL8014A
(16 LD QFN)
TOP VIEW
16 15 14 13
VIN 1 12 PGND
VIN 2 11 PGND
PAD
VDD 3 10 SGND
SYNCH 4 9 SGND
576 8
REFER TO APPLICATION NOTE AN1366 FOR MORE LAYOUT SUGGESTIONS.
Pin Descriptions
PIN NUMBER PIN NAME DESCRIPTION
1, 2 VIN Input supply voltage. Connect a 10F ceramic capacitor to power ground.
3 VDD Input supply voltage for the analog circuitry. Connect to VIN pin.
5 EN Regulator enable pin. Enable the output when driven to high. Shut down the chip and discharge output
capacitor when driven to low. Do not leave this pin floating.
7 PG 1ms timer output. At power-up or EN HI, this output is a 1ms delayed power-good signal for the output
voltage.
4 SYNCH Mode Selection pin. Connect to logic high or input voltage VDD for PWM mode. Connect to logic low or
ground for PFM mode. Connect to an external function generator for synchronization with the negative
edge trigger. Do not leave this pin floating.
14, 15 LX Switching node connection. Connect to one terminal of the inductor.
11, 12 PGND Power ground
9, 10 SGND Signal ground
8 VFB Buck regulator output feedback. Connect to the output through a resistor divider for adjustable output
voltage. For 0.8V output voltage, connect this pin to the output.
6, 13, 16 NC No connect
- Exposed Pad The exposed pad must be connected to the SGND pin for proper electrical performance. Place as much
vias as possible under the pad connecting to SGND plane for optimal thermal performance.
FN7525 Rev 2.00 Page 2 of 16
December 16, 2014
NC
EN
LX
NC
LX
PG
VFB NC