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ISL85403 の電気的特性と機能

ISL85403のメーカーはIntersil Corporationです、この部品の機能は「2.5A Regulator」です。


製品の詳細 ( Datasheet PDF )

部品番号 ISL85403
部品説明 2.5A Regulator
メーカ Intersil Corporation
ロゴ Intersil Corporation ロゴ 




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ISL85403 Datasheet, ISL85403 PDF,ピン配置, 機能
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





ISL85403 pdf, ピン配列
Pin Configuration
ISL85403
ISL85403
(20 LD QFN)
TOP VIEW
20 19 18 17 16
EN 1
FS 2
SS 3
FB 4
COMP 5
TherPm22aA1l1DPad
6 7 8 9 10
15 BOOT
14 PGND
13 LGATE
12 SYNC
11 EXT_BOOST
Functional Pin Descriptions
PIN NAME PIN #
DESCRIPTION
EN 1 The controller is enabled when this pin is left floating or pulled HIGH. The IC is disabled when this pin is pulled LOW.
Range: 0V to 5.5V.
FS 2 Connecting this pin to VCC, or GND, or leaving it open will force the IC to have 500kHz switching frequency. The oscillator switching
frequency can also be programmed by adjusting the resistor from this pin to GND.
SS 3 Connect a capacitor from this pin to ground. This capacitor, along with an internal 5µA current source, sets the soft-start interval of
the converter. Also, this pin can be used to track a ramp on this pin.
FB 4 This pin is the inverting input of the voltage feedback error amplifier. With a properly selected resistor divider connected from VOUT
to FB, the output voltage can be set to any voltage between the power rail (reduced by maximum duty cycle and voltage drop) and
the 0.8V reference. Loop compensation is achieved by connecting an RC network across COMP and FB. The FB pin is also monitored
for overvoltage events.
COMP
5 Output of the voltage feedback error amplifier.
ILIMIT
6 Programmable current limit pin. With this pin connected to the VCC pin, or to GND, or left open, the current limiting threshold is set
to default of 3.6A; the current limiting threshold can be programmed with a resistor from this pin to GND.
MODE
7 Mode selection pin. Pull this pin to GND for forced PWM mode; to have it floating or connected to VCC will enable PFM mode when
the peak inductor current is below the default threshold of 700mA. The current boundary threshold between PFM and PWM can
also be programmed with a resistor at this pin to ground. Check for more details in the “PFM Mode Operation” on page 14.
PGOOD
8 PGOOD is an open drain output and pull-up pin with a resistor to VCC for proper function. PGOOD will be pulled low under the events
when the output is out of regulation (OV or UV) or EN pin is pulled low. PGOOD rising has a fixed 128 cycles delay.
PHASE 9, 10 These pins are the PHASE nodes that should be connected to the output inductor. These pins are connected to the source of the
high-side N-channel MOSFET.
EXT_BOOST 11 This pin is used to set boost mode and monitor the battery voltage that is the input of the boost converter. After VCC POR, the
controller will detect the voltage on this pin; if voltage on this pin is below 200mV, the controller is set in
synchronous/non-synchronous buck mode and will latch in this state unless VCC is below POR falling threshold; if the voltage on
this pin after VCC POR is above 200mV, the controller is set in boost mode and latch in this state. In boost mode, the low-side driver
output PWM with same duty cycle with upper-side driver to drive the boost switch.
In boost mode, this pin is used to monitor input voltage through a resistor divider. By setting the resistor divider, the high threshold
and hysteresis can be programmed. When voltage on this pin is above 0.8V, the PWM output (LGATE) for the boost converter is
disabled, and when voltage on this pin is below 0.8V minus the hysteresis, the boost PWM is enabled.
In boost mode operation, PFM is disabled when boost PWM is enabled. Check the “2-Stage Boost Buck Converter Operation” on
page 15 for more details.
Submit Document Feedback
3
FN8631.0
March 12, 2014
Free Datasheet http://www.0PDF.com


3Pages


ISL85403 電子部品, 半導体
ISL85403
Typical Application Schematic I
PGOOD
EN
MODE
SYNC
AUXVCC
VIN
BOOT
VCC
ILIMIT
SS
ISL85403 PHASE
LGATE
EXT_BOOST
FS
SGND
PGND
FB
COMP
VIN
VOUT
PGOOD
EN
MODE
SYNC
AUXVCC
VIN
BOOT
VCC
ILIMIT
SS
ISL85403 PHASE
LGATE
PGND
EXT_BOOST
FS
SGND
FB
COMP
VIN
VOUT
(a) SYNCHRONOUS BUCK
(b) NON-SYNCHRONOUS BUCK
Typical Application Schematic II - VCC Switch-Over to VOUT
PGOOD
EN
MODE
SYNC
AUXVCC
VIN
BOOT
VCC
ILIMIT
SS
ISL85403 PHASE
LGATE
EXT_BOOST
FS
SGND
PGND
FB
COMP
VIN
VOUT
PGOOD
EN
MODE
SYNC
AUXVCC
VIN
BOOT
VCC
ILIMIT
SS
ISL85403 PHASE
LGATE
PGND
EXT_BOOST
FS
SGND
FB
COMP
VIN
VOUT
(a) SYNCHRONOUS BUCK
(b) NON-SYNCHRONOUS BUCK
Typical Application Schematic III - Boost Buck Converter
Battery
R1 +
+
R2
PGOOD
EN
MODE
SYNC
VCC
ILIMIT
SS
EXT_BOOST
LGATE
AUXVCC
ISL85403
VIN
BOOT
PHASE
FS
SGND
PGND
FB
COMP
R3
R4
VOUT
PGOOD
EN
SYNC
EXT_BOOST
AUXVCC
VIN
VCC
ILIMIT
SS
FS
SGND
BOOT
ISL85403 PHASE
PGND
LGATE
FB
COMP
1M
130k
VCC
VIN
VOUT
(a) 2-STAGE BOOST BUCK
(b) NON-INVERTING SINGLE INDUCTOR BUCK BOOST
Submit Document Feedback
6
FN8631.0
March 12, 2014
Free Datasheet http://www.0PDF.com

6 Page



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