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PE99153DIE Schematic ( PDF Datasheet ) - Peregrine Semiconductor

Teilenummer PE99153DIE
Beschreibung Hi-Rel 6A DC-DC Converter
Hersteller Peregrine Semiconductor
Logo Peregrine Semiconductor Logo 




Gesamt 15 Seiten
PE99153DIE Datasheet, Funktion
Product Description
The PE99153 DIE is a radiation tolerant point-of-load
buck regulator delivering high efficiency at VIN = 5V and
output currents up to 6A continuous. This single-chip
solution is perfect for Hi-Rel applications and delivers
peak efficiency exceeding 93%. A minimal external
component count and high switching frequency enables
>10 W/in2 standard PCB designs while high efficiency
minimizes thermal concerns. All power switching devices
are integrated on-chip.
Fabricated in Peregrine’s patented UltraCMOS®
technology, the PE99153 offers excellent power
efficiency and intrinsic radiation tolerance.
Table 1. Radiation Performance
TID 100 kRad(Si)
SEL > 90 MeV•cm2/mg
SEB
> 90 MeV•cm2/mg
SET
> 90 MeV•cm2/mg
SEFI
> 90 MeV•cm2/mg
SEGR
> 90 MeV•cm2/mg
SEL, SEB, SEGR, SEU, SEFI: None observed, Au/60 degrees
SET: No events exceeding 30 mV transient observed @ Au,
LET=90, 60 degrees and normal incidence
Figure 1. Typical Application Diagram
Product Specification
PE99153 DIE
Hi-Rel 6A DC-DC Converter
Radiation Tolerant UltraCMOS®
Monolithic Point-of-Load Synchronous
Buck Regulator with Integrated Switches
Features
Up to 6A continuous
Output voltage range from 1.0–3.6V by
external select resistors
Input voltage range 4.6–6.0V
Current mode control, pulse-by-pulse
current limit, current sharing enabled
and (N+K) redundancy compatible
shutdown mode
SYNC function, 100 kHz–5 MHz lock
range with selectable 500 kHz / 1 MHz
free running frequency
Shutdown pin, Power Good output
pin for supply sequencing
Better than 1% typical initial accuracy
(25°C)
Control inputs compatible with TTL,
LVTTL, LVCMOS (2.5V and 3.3V)
and 5V CMOS
Document No. DOC-50371-6 www.e2v-us.com
©2012–2015 Peregrine Semiconductor Corp. All rights reserved.
Page 1 of 15






PE99153DIE Datasheet, Funktion
Typical Performance Characteristics
Figure 3. Efficiency Curves Over Output
Load Current and Temperature*
PE99153 Efficiency versus Output Current
VIN=5V, VOUT=2.5V, Fsw=1MHz
100
95
90
85
80
75
70
65 Tc = -55°C
TC = +25°C
60 Tc = +125°C
55
50
0123456
Output Current (A)
Figure 4. Efficiency Curves Over Typical
Output Voltages*
PE99153 Efficiency versus Output Current
Vin=5V, Fsw=1MHz, T=+25°C
100
95
90
85
80
75
70
65
60
55
50
0
Vout = 3.3V
Vout = 2.5V
Vout = 1.5V
Vout = 1.0V
1234
Output Current (A)
5
6
Note: * The efficiency curves in Figures 3 and 4 were measured on the packaged parts.
PE99153 DIE
Product Specification
©2012–2015 Peregrine Semiconductor Corp. All rights reserved.
Page 6 of 15
Document No. DOC-50371-6 UltraCMOS® Power Management Solutions

6 Page









PE99153DIE pdf, datenblatt
PE99153 DIE
Product Specification
Efficiency Estimation and Improvement
The efficiency of a switch mode power supply can be
estimated by identifying and estimating all sources of loss
in the power supply system. These loss terms include
switching losses, resistive losses, losses incurred on chip
and losses associated with external passive components.
External passive losses occur primarily in the output
inductor, the output capacitor and the input capacitor.
Internal losses at high current are dominated by the high
and low side switch resistance. At low current, internal
losses are dominated by quiescent bias current and
switching related losses.
The PE99153 Design Guide provides a simple tool for
estimating loss. Losses are parameterized across input
voltage, output voltage and switching frequency to provide
accurate estimates of the performance of the part under a
variety of conditions.
The following sections give the mathematical expressions
of six main loss terms calculated in the design guide
spreadsheet.
Input Capacitor
The loss in the input capacitor can be calculated by using
the estimate of the RMS capacitor current calculated in the
input capacitor selection section. Given that:
IRMS–CIN = ILOAD (max) × [D × (1–D)]
Power lost in the input capacitor can be calculated as:
PLOSS–CIN = I2RMS–CIN × RCIN–ESR
Output Capacitor
The RMS current through the output capacitor in steady
state was calculated in the output capacitor selection
section as IL/3. Power loss in the output capacitor is
then calculated as:
PLOSS–COUT = (IL2/ 3) × RCOUT–ESR
Note that RCOUT–ESR is the ESR of the frequency range of
capacitors absorbing the ripple current.
Inductor
The inductor RMS current is given by:
ILRMS = I LOAD IL/2 + IL / 3
Power lost in the DC resistance of the inductor is then
given as:
PLOSS–LOUT–DCR = ILRMS2 × RLOUT–DCR
High Side Switch Loss
During the time the HSS is on, it is supporting the load
current plus the inductor ripple current. RMS current
through the HSS, when it is on, is given by:
IRMS–HSS = ILOAD IL / 2 + IL / 3
PLOSS–HSS = IRMS–HSS2 × RON–HSS × D
Where the extra factor of D = VOUT/VIN is the duty ratio and
is included because power is only dissipated in the HSS
when it is on.
Low Side Switch Loss
During the time the LSS is on, it is supporting the load
current plus the inductor ripple current. RMS current
through the LSS, when it is on, is given by:
IRMS–LSS = ILOAD IL / 2 + IL / 3
PLOSS–LSS = IRMS–LSS2 × RON–LSS × (1 –D)
Where the extra factor of 1 – (D = VOUT / VIN) is the duty
ratio of the LSS and is included because power is only
dissipated in the LSS when it is on.
Other Internal Loss
A complete list of internal losses in the PE99153 regulator is
estimated and available in the PE99153 design guide
spreadsheet available online. The internal losses are
parameterized across input voltage, output voltage and
switching frequency to provide accurate estimates of the
performance under a variety of conditions.
Setting the Current Limit
When the RSEL pin is grounded, the PE99153 uses an
internal current limiting resistor that will limit the output
current to a value of ILIMXINT listed in Table 2 of the
datasheet. See Figure 8 for a visual description of the
various current limits. The part can be programmed to use
an alternate current limit by tying the RSEL pin to VIN. In
this mode, the PE99153 can be programmed to various
output current limits through the selection of a resistor
connecting the RSET pin to ground.
Figure 8. PE99153 DIE Current Limits
Absolute Max: Io
Operating Max: Imax
Max Current Limit:
ILIMXEXT or ILIMXINT
Current Threshold
IL ILOAD (average current)
Time
©2012–2015 Peregrine Semiconductor Corp. All rights reserved.
Page 12 of 15
Document No. DOC-50371-6 UltraCMOS® Power Management Solutions

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