MAX1962EEP+ Maxim Integrated Products, MAX1962EEP+ Datasheet

IC DC-DC CTRL STP DWN 20-QSOP

MAX1962EEP+

Manufacturer Part Number
MAX1962EEP+
Description
IC DC-DC CTRL STP DWN 20-QSOP
Manufacturer
Maxim Integrated Products
Type
Step-Down (Buck)r
Datasheet
1.MAX1960EEP.pdf (29 pages)

Specifications of MAX1962EEP+

Internal Switch(s)
No
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
0.8 ~ 4.95 V
Current - Output
20A
Frequency - Switching
500kHz, 1MHz
Voltage - Input
2.35 ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
20-QSOP
Power - Output
727mW, 9.1mW
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
19-2740; Rev 1; 6/09
The MAX1960/MAX1961/MAX1962 high-current, high-
efficiency voltage-mode step-down DC-DC controllers
operate from a 2.35V to 5.5V input and generate output
voltages down to 0.8V at up to 20A. An on-chip charge
pump generates a regulated 5V for MOSFET drive.
Additionally, adaptive dead-time drivers allow a
wide variety of MOSFETs to be used without risking
shoot-through.
Fixed-frequency PWM operation and external synchro-
nization make these controllers suitable for telecom
and datacom applications. The operating frequency is
programmable to either 500kHz or 1MHz, or from
450kHz to 1.2MHz with an external clock. A clock output
is provided to synchronize another converter for 180°
out-of-phase operation. A high closed-loop bandwidth
provides excellent transient response for applications
with dynamic loads.
Lossless current sensing in the MAX1960 and
MAX1961 is achieved by monitoring the drain-to-source
voltage of the low-side external FET. The current limit is
scalable to accommodate a wide variety of MOSFETs
and load currents. The MAX1962 has 10% accurate
sense-resistor-based current limiting.
The MAX1960 and MAX1962 have an adjustable output
voltage from 0.8V to 4.95V. The MAX1961 and
MAX1962 have four preset output voltages (1.5V, 1.8V,
2.5V, and 3.3V) and feature 0.5% voltage accuracy
over temperature, line, and load variations. The
MAX1960 and MAX1961 also feature voltage-margining
control inputs that shift the output voltage up or down
by 4% for system testing.
Pin Configurations and Selector Guide appear at the end
of the data sheet.
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
ASIC, FPGA, DSP, and CPU Core and I/O Voltages
Cellular Base Stations
Telecom and Network Equipment
Server and Storage Systems
Step-Down Controllers with Voltage Margining
2.35V to 5.5V, 0.5% Accurate, 1MHz PWM
________________________________________________________________ Maxim Integrated Products
General Description
Applications
o 0.5% Accurate Output
o Operates from 2.35V to 5.5V Supply
o Generates Low Output Voltage Down to 0.8V
o On-Chip Charge Pump Provides 5V Gate Drive
o Ceramic or Electrolytic Capacitors
o 94% Efficiency
o External Synchronization from 450kHz to 1.2MHz
o 500kHz/1MHz Fixed-Frequency PWM Operation
o Fast Transient Response
o Two Converters Can Operate 180° Out-of-Phase
o ±4% Voltage Margining for System Test
o 10% Accurate Current Sensing (MAX1962)
o Adaptive Dead Time Prevents Shoot-Through
MAX1960EEP
MAX1961EEP
MAX1962EEP
AND ON/OFF
MARGINING
OPTIONAL
SYNCHRONIZATION
CLKOUT
180° OUT-OF-PHASE
INPUT
2.35V TO 5.5V
VOLTAGE
PART
Typical Operating Circuit
V
CTL1
CTL2
COMP
REF
GND
FSET/SYNC
CLKOUT
CC
C+
MAX1960
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
Ordering Information
C-
PGND
AV
ILIM
V
BST
DH
DL
DD
DD
LX
FB
PIN-PACKAGE
20 QSOP
20 QSOP
20 QSOP
Features
0.8 TO 0.87
UP TO 20A
OUTPUT
✕
V
IN
1

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MAX1962EEP+ Summary of contents

Page 1

... Telecom and Network Equipment Server and Storage Systems Pin Configurations and Selector Guide appear at the end of the data sheet. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. o 0.5% Accurate Output o Operates from 2 ...

Page 2

Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining ABSOLUTE MAXIMUM RATINGS V , CTL_, CS, FSET/SYNC, SEL, EN, CC OUT to GND ..........................................................-0.3V to +6V ILIM, COMP, REF, FB, CLKOUT GND ..............................................-0. ...

Page 3

Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining ELECTRICAL CHARACTERISTICS (continued 3.3V, Circuits of Figures 9–12, T VCC PARAMETER V Output Voltage DD Reference Voltage (No Load) Reference Load Regulation Positive Current-Limit Threshold (V ...

Page 4

Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining ELECTRICAL CHARACTERISTICS (V = 3.3V, Circuits of Figures 9–12, T VCC PARAMETER V Input Voltage Range CC V Input Voltage UVLO CC V Input Voltage UVLO DD Output ...

Page 5

Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining ELECTRICAL CHARACTERISTICS (continued 3.3V, Circuits of Figures 9–12, T VCC PARAMETER Current-Limit Threshold (Negative Direction, Adjustable PGND DH Gate-Driver On-Resistance DL ...

Page 6

Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining (Circuit of Figure +25°C, unless otherwise noted.) A EFFICIENCY vs. LOAD CURRENT WITH 15A 1MHz CIRCUIT, 3.3V INPUT 100 V = 2.5V OUT 90 80 ...

Page 7

Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining (Circuit of Figure +25°C, unless otherwise noted.) A FREQUENCY vs. TEMPERATURE 1100 1000 900 FSET/SYNC = V CC 800 700 600 500 400 300 FSET/SYNC ...

Page 8

Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining (Circuit of Figure +25°C, unless otherwise noted.) A 7.5A TO 15A TO 7.5A LOAD TRANSIENT V OUT I LOAD 20µs/div STARTUP/SHUTDOWN WAVEFORMS ...

Page 9

Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining PIN NAME MAX1960 MAX1961 MAX1962 CLKOUT FSET/SYNC 3 3 — ILIM — — — SEL 4 — — ...

Page 10

Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining PIN NAME MAX1960 MAX1961 MAX1962 BST Detailed Description The ...

Page 11

Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining ILIM (MAX1960/MAX1961) CLKOUT OSC FSET/SYNC OSC COMP OUT (MAX1961/MAX1962) FEEDBACK FB (MAX1960/MAX1962) VSEL (MAX1961/MAX1962) CTL1 (MAX1960/MAX1961) CTL2 (MAX1960/MAX1961) EN (MAX1962) Figure 1. Functional Diagram MOSFET Gate Drivers The ...

Page 12

Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining Operating Frequency and Synchronization The MAX1960/MAX1961/MAX1962 operating frequency is set externally to either 500kHz or 1MHz. For 500kHz operation, connect FSET/SYNC to GND, or for 1MHz operation, connect ...

Page 13

Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining Inductor operating point. This choice provides tradeoffs between size, transient response, and effi- ciency. Choosing higher inductance values results in lower inductor ripple current, lower peak current, lower ...

Page 14

Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining TIME Figure 3. Inductor Current Waveform ates a 128 clock cycle counter. If the current limit is pre- sent at the end of this count, the controller remains ...

Page 15

Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining Output Capacitor Selection The output filter capacitor must have low enough effective series resistance (ESR) to meet output ripple and load transient requirements. In addition, the capacitance value ...

Page 16

Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining MAX1960 FB R4 COMP C2 Figure 5. Type 3 Compensation Network where Maximum input voltage IN(MAX Oscillator ...

Page 17

Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining Compensation with Electrolytic Output Capacitors The MAX1960/MAX1961/MAX1962 use a voltage-mode control scheme that regulates the output voltage by comparing the error-amplifier output (COMP) with a fixed internal ramp ...

Page 18

Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining × × 2π PMOD A small capacitor C , can also be added from COMP to F GND to provide high-frequency ...

Page 19

Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining FEEDBACK DIVIDER Figure 7. Open-Loop Transfer Model (4) Gate threshold voltage (V TH(MIN) (5) Turn-on/turn-off times (6) Turn-on/turn-off delays At high switching rates, ...

Page 20

Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining INPUT DH N1 MAX1960 PGND Figure 8. RC Snubber Circuit 4) The circuit parasitic inductance PAR π × × 2 ...

Page 21

Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining Table 3. Component List for Application Circuits PART APP. CIRCUIT 0.47µF ceramic capacitor 5 × 10µF ceramic capacitors ...

Page 22

Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining Table 4. R1, R3, and C9 Component Values for 1MHz Operation V = 3.3V OUT (kΩ) R3 (kΩ) C9 (µF) 5V 3.12 1.2 0.0068 3.3V ...

Page 23

Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining INPUT 2. CLKOUT Figure 9. Application Circuit 1—MAX1960 Adjustable Output Voltage ______________________________________________________________________________________ CTL1 ...

Page 24

Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining INPUT 2. CLKOUT Figure 10. Application Circuit 2—MAX1961 Preset Output Voltage 24 ______________________________________________________________________________________ ...

Page 25

Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining INPUT 2. COMP C9 REF C8 R3 GND FSET/SYNC CLKOUT CLKOUT VSEL Figure 11. Application Circuit 3—MAX1962 Adjustable Output Voltage ______________________________________________________________________________________ C1 ...

Page 26

Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining INPUT 2.35V TO 3. COMP C9 REF C8 R3 GND FSET/SYNC CLKOUT CLKOUT VSEL Figure 12. Application Circuit 4—MAX1962 Tripler Configuration, Preset Output 26 ...

Page 27

Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining INPUT 2. 10µF C10 C9 33pF 820pF C8 R3 0.22µF 10kΩ CLKOUT N1 – IRLR7821 N2 – IRLR7833 Figure 13. Application Circuit—Ceramic Output ...

Page 28

Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining TOP VIEW CLKOUT 1 FSET/SYNC 2 ILIM 3 N.C. (SEL) 4 MAX1960 CTL1 5 MAX1961 CTL2 (OUT) 8 COMP 9 REF 10 QSOP ...

Page 29

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 29 © 2009 Maxim Integrated Products DESCRIPTION Maxim is a registered trademark of Maxim Integrated Products, Inc ...

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