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Linear Technology - Fixed Ratio High Power Inductorless (Charge Pump) DC/DC Controller

Numéro de référence LTC7820
Description Fixed Ratio High Power Inductorless (Charge Pump) DC/DC Controller
Fabricant Linear Technology 
Logo Linear Technology 





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LTC7820 fiche technique
LTC7820
Features
Fixed Ratio High Power
Inductorless (Charge Pump)
DC/DC Controller
Description
nn Low Profile, High Power Density, Capable of 500W+
nn Soft Switching: 99% Peak Efficiency and Low EMI
nn VIN Max for Voltage Divider (2:1): 72V
nn VIN Max for Voltage Doubler (1:2)/Inverter (1:1): 36V
nn Wide Bias VCC Range: 6V to 72V
nn Soft Startup into Steady State Operation
nn 6.5V to 40V EXTVCC Input for Improved Efficiency
nn Input Current Sensing and Overcurrent Protection
nn Wide Operating Frequency Range: 100kHz to 1MHz
nn Output Short-Circuit/OV/UV Protections with
Programmable Timer and Retry
nn Thermally Enhanced 28-Pin 4mm × 5mm QFN Package
Applications
nn Bus Converters
nn High Power Distributed Power Systems
nn Communications Systems
nn Industrial Applications
The LTC®7820 is a fixed ratio high voltage high power
switched capacitor/charge pump controller. The device
includes four N-channel MOSFET gate drivers to drive
external power MOSFETs in voltage divider, doubler or
inverter configurations. The device achieves a 2:1 step-
down ratio from an input voltage as high as 72V, a 1:2
step-up ratio from an input voltage as high as 36V, or a
1:1 inverting ratio from an input voltage up to 36V. Each
power MOSFET is switched with 50% duty cycle at a
constant pre-programmed switching frequency. System
efficiency can be optimized to over 99%. The LTC7820
provides a small and cost effective solution for high
power, non-isolated intermediate bus applications with
fault protection.
The LTC7820 switching frequency can be linearly
programmed from 100 kHz to 1MHz. The device is available
in a thermally enhanced 28-lead QFN package with some
no-connect pins for high voltage compatible pin spacing.
L, LT, LTC, LTM, Linear Technology, the Linear logo and LTspice are registered trademarks of
Analog Devices, Inc. All other trademarks are the property of their respective owners. Protected
by U.S. patents, including 9484799.
Typical Application
Very High Efficiency 5A Voltage Divider
10Ω
0.1µF
100Ω
0.1µF
0.1µF
VHIGH_SENSE
VCC
ISENSE–
G1
ISENSE+
TIMER
BOOST1
LTC7820
SW1
G2
RUN BOOST2
12V
INTVCC
10k
10k
10k
10k 40k
EXTVCC
UV
HYS_PRGM
PGOOD
FREQ
VLOW
VLOW_SENSE
G3
BOOST3
SW3
G4
INTVCC
FAULT
GND
0.1µF
1µF
1µF
INTVCC
4.7µF
RSENSE
0.005Ω
VIN
48V/24V
10Ω
0.1µF
10µF
×6
10µF
VOUT
24V/12V
5A*
* LOAD CURRENT APPLIED
AFTER STARTUP
7820 TA01a
Efficiency and Power Loss
vs Load Current
100
EFFICIENCY
99
VIN = 48V
VOUT = 24V
2.0
1.6
98
fs = 100kHz
97
96
1.2
VIN = 24V
VOUT = 12V
0.8
0.4
POWER LOSS
95 0
012345
LOAD CURRENT (A)
7820 TA01b
7820f
For more information www.linear.com/LTC7820
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