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Analog Devices LTC7897 | Demoboard EVAL-LTC7897-AZ

Wide Input and Output Voltage Synchronous Buck Controller

Overview

TopologyBuck Converter
Input voltage16-100 V
Switching frequency200-240 kHz
Output 112 V / 20 A

Description

The evaluation circuit EVAL-LTC7897-AZ features the LTC®7897: a 140V Low IQ Synchronous Buck Controller with Programmable 5V to 10V Gate Drive. Split gate drivers allow for easily adjustable turn-on and turn-off of FETs. User adjustable adaptive and smart dead time control modes are available for optimal gate timing. Additionally, the IC features low IQ, up to 2.5MHz programmable/synchronizable switching frequency, spread spectrum, and a small 28-lead (4mm x 5mm) QFN package. These features allow for a wide variety of applications including industrial, military, medical, and telecommunications systems.The EVAL-LTC7897-AZ operates from a 16V to 100V input voltage range and generates a 12V, 20A output (see Figure 8 in user guide). The LTC7897 has a precision voltage reference providing an output voltage with 2% tolerance over the full operating conditions. The EVAL-LTC7897-AZ is set to a 200kHz switching frequency, which results in a small and efficient circuit. The converter achieves over 93% efficiency with a 20A load at full operating VIN and peak efficiency over 96%.

Features

Wide VIN Range: 4V to 135V (140V ABS MAX)Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 135V (140V ABS MAX)Adjustable Gate Drive Level: 5V to 10V (OPTI-DRIVE, 15V ABS MAX)Adjustable Driver Voltage UVLOAdaptive or Resistor Adjustable Dead TimesSplit-Output Gate Drivers for Adjustable Turn-On and Turn-Off Driver Strengths100% Duty Cycle OperationLow Operating IQ: 5μA (48V<IN to 3.3VOUT)Spread Spectrum Frequency ModulationProgrammable Frequency (100kHz to 2.5MHz);Synchronizable Frequency (100kHz to 2.5MHz);28-Pin (4mm x 5mm) QFN Package

Typical applications

Products

Order Code Data­sheet Simu­lation Downloads Status Product seriesCTol. CVR
(V (DC))
SizeOperating TemperatureDF
(%)
RISOCeramic TypeL
(mm)
W
(mm)
Fl
(mm)
L
(µH)
IRP,40K
(A)
ISAT,10%
(A)
ISAT,30%
(A)
RDC max.
(mΩ)
fres
(MHz)
Wire TypeEndurance
(h)
IRIPPLE
(mA)
ILeak
(µA)
Pitch
(mm)
Ø D
(mm)
Pins
(pcs)
RowsH
(mm)
GenderTypeIR
(A)
Packaging Samples
885012206088SPEC
9 files Active i| Production is active. Expected lifetime: >10 years.WCAP-CSGP MLCCs 50 V(DC)6.8 nF ±10% 50 0603 -55 °C up to +125 °C 2.510 GΩ X7R Class II 1.6 0.8 0.4 0.8 7" Tape & Reel
860241078002SPEC
7 files Active i| Production is active. Expected lifetime: >10 years.WCAP-AT1H Aluminum Electrolytic Capacitors47 µF ±20% 200 13.0 x 20.0 15 20 10000 980 476 5 13 Ammopack
7443630550SPEC
9 files Active i| Production is active. Expected lifetime: >10 years.WE-HCF SMT High Current Inductor 2013 -40 °C up to +125 °C 20.8 20.5 5.5 23.35 30 33 4.4 21 Flat 2 13.5 22
62000621121SPEC
7 files Active i| Production is active. Expected lifetime: >10 years.WR-PHD 2.00 mm THT Dual Pin Header -40 °C up to +105 °C1000 MΩ 6 2 6 Dual Pin Header Straight 2 Bag
Samples
Order Code Data­sheet Simu­lation Downloads Status Product seriesCTol. CVR
(V (DC))
SizeOperating TemperatureDF
(%)
RISOCeramic TypeL
(mm)
W
(mm)
Fl
(mm)
L
(µH)
IRP,40K
(A)
ISAT,10%
(A)
ISAT,30%
(A)
RDC max.
(mΩ)
fres
(MHz)
Wire TypeEndurance
(h)
IRIPPLE
(mA)
ILeak
(µA)
Pitch
(mm)
Ø D
(mm)
Pins
(pcs)
RowsH
(mm)
GenderTypeIR
(A)
Packaging Samples