ISL8002B Datasheet, PDF (1/22 Pages) Intersil Corporation – External soft-start programmable

DATASHEET
Compact Synchronous Buck Regulator
ISL8002B
The ISL8002B is a highly efficient, monolithic, synchronous
step-down DC/DC converter that can deliver up to 2A of
continuous output current from a 2.7V to 5.5V input supply. It
uses peak current mode control architecture to allow very low
duty cycle operation. ISL8002B operates at a 2MHz switching
frequency, thereby providing superior transient response and
allowing for the use of a small inductor. ISL8002B also has
excellent stability.
The ISL8002B integrates very low r_DS(ON) MOSFETs in order to
maximize efficiency. In addition, since the high-side MOSFET is a
PMOS, the need for a boot capacitor is eliminated, thereby
reducing external component count.
The device can be configured for either PFM (discontinuous
conduction) or PWM (continuous conduction) operation at light
load. PFM provides high efficiency by reducing switching
losses at light loads and PWM for fast transient response,
which helps reduce the output noise and RF interference.
The device is offered in a space saving 8 Ld 2mmx2mm TDFN
Pb-free package with exposed pad for improved thermal
performance. The complete converter occupies less than
64mm² area.
Features
• V_IN range 2.7V to 5.5V
• I_OUT maximum is 2A
• External soft-start programmable
• Output tracking and sequencing
• Switching frequency is 2MHz
• Selectable PFM or PWM operation option
• Overcurrent and short-circuit protection
• Over-temperature/thermal protection
• V_IN undervoltage lockout and V_OUT overvoltage protection
• Up to 95% peak efficiency
Applications
• General purpose POL
• Industrial, instrumentation and medical equipment
• FPGAs
• Telecom and networking equipment
• Game console
Related Literature
• For a full list of related documents, visit our website
- ISL8002B product page
VIN
GND
+2.7 V … +5.5 V
C1
1
VIN
22µF
2 _EN
EN
3 _MODE
PG
4 _PG
ISL8002B
PAD
9
L1
PHASE ⁸
C2
3x10µF
PGND ⁷
+ 1. 8V / 2A
C3
4.7pF
FB ⁶
0.6V
SS/T R ⁵
R1
200k 1%
R2
100k 1%
R3
200k 1%
R4
100k 1%
VOUT
GND
TRACK
R₁
=
R₂


V^---V--F^--O--B^--
–
1_
(EQ. 1)
FIGURE 1. TYPICAL APPLICATION CIRCUIT CONFIGURATION (INTERNAL
COMPENSATION OPTION)
100
2.5V_OUT
90
80
1.8V_OUT
70
1.5V_OUT
1.2V_OUT
60
50
0.9V_OUT
0.8V_OUT
40
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
OUTPUT LOAD (A)
FIGURE 2. EFFICIENCY vs LOAD (f_SW = 2MHz, V_IN = 3.3V),
MODE = PFM, T_A = +25°C
October 28, 2016
1
FN8690.3
CAUTION: The device are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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