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PDF ISL85403 Data sheet ( Hoja de datos )
| Número de pieza | ISL85403 | |
| Descripción | 2.5A Regulator | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ISL85403 (archivo pdf) en la parte inferior de esta página. Total 23 Páginas | ||
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2.5A Regulator with Integrated High-Side MOSFET for
Synchronous Buck or Boost Buck Converter
ISL85403
The ISL85403 is an 36V, 2.5A synchronous buck or boost buck
controller with a high-side MOSFET and low-side driver integrated. In
buck mode, the ISL85403 supports a wide input range of 3V to 36V.
In boost-buck mode, the input range can be extended down to 2.5V
and output regulation can be maintained when VIN drops below
VOUT, enabling sensitive electronics to remain on in low input voltage
conditions.
The ISL85403 has a flexible selection of operation modes of
forced PWM mode and PFM mode. In PFM mode, the
quiescent input current is as low as 180µA (AUXVCC connected
to VOUT). The load boundary between PFM and PWM can be
programmed to cover wide applications.
The low-side driver can be either used to drive an external low-side
MOSFET for a synchronous buck, or left unused for a standard
non-synchronous buck. The low-side driver can also be used to
drive a boost converter as a pre-regulator followed by a buck
controlled by the same IC, which greatly expands the operating
input voltage range down to 2.5V or lower (Refer to “Typical
Application Schematic III - Boost Buck Converter” on page 6).
The ISL85403 offers the most robust current protections. It uses
peak current mode control with cycle-by-cycle current limiting.
It is implemented with frequency foldback under current limit
condition; besides that, the hiccup overcurrent mode is also
implemented to guarantee reliable operations under harsh
short conditions.
The ISL85403 has comprehensive protections against various
faults including overvoltage and over-temperature protections,
etc.
Features
• Buck mode: input voltage range 3V to 36V (refer to “Input
Voltage” on page 15 for more details)
• Boost mode expands operating input voltage lower than
2.5V (refer to “Input Voltage” on page 15 for more details)
• Selectable forced PWM mode or PFM mode
• 300µA IC quiescent current (PFM, no load); 180µA input
quiescent current (PFM, no load, VOUT tied to AUXVCC)
• Less than 5µA (MAX) shutdown input current (IC disabled)
• Operational topologies
- Synchronous buck
- Non-synchronous buck
- Two-stage boost buck
- Non-inverting single inductor buck boost
• Programmable frequency from 200kHz to 2.2MHz and
frequency synchronization capability
• ±1% tight voltage regulation accuracy
• Reliable overcurrent protection
- Temperature compensated current sense
- Cycle-by-cycle current limiting with frequency foldback
- Hiccup mode for worst case short condition
• 20 Ld 4x4 QFN package
• Pb-free (RoHS compliant)
Applications
• General purpose
• 24V bus power
• Battery power
• Point of load
• Embedded processor and I/O supplies
PGOOD
EN
MODE
VIN
SYNC
AUXVCC
ISL85403
VCC
ISL85403
ILIMIT
SS
BOOT
PHASE
LGATE
EXT_BOOST
FS
SGND
PGND
FB
COMP
VIN
FIGURE 1. TYPICAL APPLICATION
March 12, 2014
FN8631.0
1
VOUT
100
95 6V VIN
90
85 12V VIN
80
75 36V VIN
70 24V VIN
65
60
55
50
0.1m
1m
10m
100m
1.0
LOAD CURRENT (A)
FIGURE 2. EFFICIENCY, SYNCHRONOUS BUCK, PFM MODE,
VOUT 5V, TA = +25°C
2.5
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2014. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
Free Datasheet http://www.0PDF.com
1 page  
Block Diagram
VCC
VIN
AUXVCC
BIAS LDO
AUXILARY LDO
PGOOD
CURRENT
MONITOR
VIN (x2)
SGND
EN
EXT_BOOST
MODE
SYNC
FS
POWER-ON
RESET
PFM/FPWM
OSCILLATOR
VCC
5µA
SOFT-START
LOGIC
OCP, OVP, OTP
PFM LOGIC
BOOST MODE CONTROL
VCC
VOLTAGE
MONITOR
0.8V
REFERENCE
EA
SLOPE
COMPENSATION
+
+
COMPARATOR
GATE DRIVE
BOOT REFRESH
ILIMIT
BOOT
PHASE (x2)
LGATE
SS FB COMP
PGND
5 Page 
ISL85403
Typical Performance Curves (Continued)
200
180
160 VIN = 12V
140
120
100 VIN = 24V
80
60
40
20
0-50 -25 0 25 50 75 100
AMBIENT TEMPERATURE (°C)
FIGURE 9. INPUT QUIESCENT CURRENT UNDER NO LOAD,
PFM MODE, VOUT = 5V
125
85
80
75
70
65 VO = 20V
60
55
50
45
VO = 5V
VO = 12V
40
35
30
250 5 10 15 20 25 30 35
VIN (V)
FIGURE 10. IC DIE TEMPERATURE UNDER +25°C AMBIENT
TEMPERATURE, STILL AIR, 500kHz, IO = 2A
40
85
80
75
VO = 20V
70
65
60
55 VO = 5V
VO = 12V
50
45
40
35
30
25
0 5 10 15 20 25 30 35
VIN (V)
FIGURE 11. IC DIE TEMPERATURE UNDER +25°C AMBIENT
TEMPERATURE, STILL AIR, 500kHz, IO = 2.5A
40
VOUT 2V/DIV
PHASE 20V/DIV
2ms/DIV
FIGURE 12. SYNCHRONOUS BUCK MODE, VIN 36V, IO 2A,
ENABLE ON
VOUT 2V/DIV
PHASE 20V/DIV
2ms/DIV
FIGURE 13. SYNCHRONOUS BUCK MODE, VIN 36V, IO 2A,
ENABLE OFF
Submit Document Feedback 11
VOUT 2V/DIV
PHASE 20V/DIV
2ms/DIV
FIGURE 14. VIN 36V, PREBIASED START-UP
FN8631.0
March 12, 2014
Free Datasheet http://www.0PDF.com
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet ISL85403.PDF ] | |
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