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PDF ISL8510 Data sheet ( Hoja de datos )
| Número de pieza | ISL8510 | |
| Descripción | Dual Output Controller | |
| Fabricantes | Intersil Corporation | |
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®
Data Sheet
December 15, 2008
ISL8510
FN6516.2
Dual Output Controller with 1A Standard
Buck PWM and LDO
The ISL8510 is a high-performance, dual output controller
that provides a single, high frequency power solution for a
variety of point of load applications. The ISL8510 integrates
a 1A standard buck PWM controller and switching MOSFET
with one 500mA LDO.
The PWM controller in the ISL8510 drives an internal
switching N-Channel power MOSFET and requires an
external Schottky diode to generate an output voltage from
0.6V to 20V. The integrated power switch is optimized for
excellent thermal performance up to 1A of output current. The
standard buck input voltage range supports a fixed 5V or
variable 5.5V to 25V range. The PWM regulator switches at a
fixed frequency of 500kHz and utilizes simple voltage mode
control with input voltage feed forward to provide flexibility in
component selection and minimize solution size. Protection
features include overcurrent, undervoltage, and thermal
overload protection integrated into the IC. The ISL8510
power-good signal output indicates loss of regulation on the
PWM output.
The ISL8510 features one adjustable LDO regulator using
internal PMOS transistors as pass devices. The enable pin
(EN_LDO) controls the LDO output. A single power-good
signal output indicates loss of regulation on the LDO output.
Independent overcurrent and thermal fault shutdown monitors
are integrated into the “LDO Regulator Capacitor Selection”
on page 16.
The ISL8510 is available in a small 4mmx4mm Quad Flat No
Lead (QFN) package.
Features
• Standard Buck Controller with Integrated Switching Power
MOSFET + 1 LDO
• Integrated Boot Diode
• Input Voltage Range
- Fixed 5V ±10%
- Variable 5.5V to 25V
• PWM Output Voltage Adjustable from 0.6V to 20V with
Continuous Output Current up to 1A
• Voltage Mode Control with Voltage Feed Forward
• Fixed 500kHz Switching Frequency
• Externally Adjustable Soft-Start Time
• Output Undervoltage Protection
• LDO Adjustable Options
- LDO, 0.6V to 4.2V . . . . . . . . . . . . . . . . . . . . . . . 500mA
• Individual Enable Inputs
• Two PGOOD Outputs (PWM and LDO)
• Overcurrent Protection
• Thermal Overload Protection
• Internal 5V LDO regulator
• Pb-Free (RoHS Compliant)
Applications
• General Purpose
• WLAN Cards-PCMCIA, Cardbus32, MiniPCI Cards-
Compact Flash Cards
• Hand-Held Instruments
1 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. 2007, 2008. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
Functional Block Diagram
ISL8510
VCC SOFT-START
CONTROL
30µA
VOLTAGE
MONITOR
SS
EN_PWM
EN_LDO
FAULT
MONITOR
VCC
VIN
PG_PWM
LDO
POWER-ON
RESET
MONITOR
PWM
EA
OC
MONITOR
0.6V
REFERENCE
RAMP
GENERATOR
VIN
GATE
DRIVE
THERMAL
MONITOR
+150°C
OC
MONITOR
OSCILLATOR
POR
PVCC
VIN_LDO
Gm
REF
POR
FAULT
LDO
CONTROL
LOGIC
WINDOW
COMP.
+-
LDO
PG_LDO
VIN (x2)
PHASE (x2)
CC1
VIN_LDO
VOUT
FB_LDO
GND
5 FN6516.2
December 15, 2008
5 Page 
ISL8510
Typical Performance Curves Circuit of Figure 2. VIN = 12V, VIN_LDO = VOUT = 3.3V, IOUT = 1A, VLDO = 1.2V, ILDO = 450mA,
TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C. (Continued)
5.1 6
5.0 5
4.9 4
4.8 50mA LOAD
3
4.7
4.6 2 NO LOAD
4.5 1
4.4
0
50 100 150
I VCC (mA)
FIGURE 15. VCC LOAD REGULATION
200
0
0 5 10 15 20 25
VIN (V)
FIGURE 16. VCC REGULATION WITH VIN
30
1.30
1.28
1.26
7VIN
1.24
1.22
12VIN
1.20
1.18
1.16
1.14
1.12
25VIN
1.10
0
100 200 300 400 500 600 700
OUTPUT LOAD (mA)
FIGURE 17. LDO vs LOAD, 500kHz, VIN LDO = 3.3V
LX 5V/DIV
VOUT RIPPLE
20mV/DIV
IL 0.2A/DIV
LDO RIPPLE
20mV/DIV
FIGURE 18. STEADY STATE OPERATION AT NO LOAD,
20µs/DIV
LX 5V/DIV
VOUT RIPPLE
20mV/DIV
IL 0.5A/DIV
LDO RIPPLE
20m/DIV
FIGURE 19. STEADY STATE OPERATION AT FULL LOAD,
2µs/DIV
11 FN6516.2
December 15, 2008
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet ISL8510.PDF ] | |
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