MAX1980ETP+ Maxim Integrated Products, MAX1980ETP+ Datasheet

IC CNTRLR QUICK-PWM 20-TQFN

MAX1980ETP+

Manufacturer Part Number
MAX1980ETP+
Description
IC CNTRLR QUICK-PWM 20-TQFN
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX1980ETPT.pdf (33 pages)

Specifications of MAX1980ETP+

Pwm Type
Controller
Number Of Outputs
1
Frequency - Max
550kHz
Duty Cycle
50%
Voltage - Supply
4 V ~ 28 V
Buck
Yes
Boost
No
Flyback
No
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
No
Operating Temperature
0°C ~ 85°C
Package / Case
20-TQFN Exposed Pad
Frequency-max
550kHz
Input Voltage
4 V to 28 V
Mounting Style
SMD/SMT
Maximum Operating Temperature
+ 100 C
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX1980 step-down slave controller is intended for
low-voltage, high-current, multiphase DC-DC applica-
tions. The MAX1980 slave controller can be combined
with any of Maxim’s Quick-PWM
to form a multiphase DC-DC converter. Existing Quick-
PWM controllers, such as the MAX1718, function as the
master controller, providing accurate output-voltage regu-
lation, fast transient response, and fault protection fea-
tures. Synchronized to the master’s low-side gate driver,
the MAX1980 includes the Quick-PWM constant on-time
controller, gate drivers for a synchronous rectifier, active
current balancing, and precision current-limit circuitry.
The MAX1980 provides the same high-efficiency, ultra-
low duty factor capability, and excellent transient
response as other Quick-PWM controllers. The MAX1980
differentially senses the inductor currents of both the
master and the slave across current-sense resistors.
These differential inputs and the adjustable current-limit
threshold derived from an external reference allow the
slave controller to accurately balance the inductor cur-
rents and provide precise current-limit protection. The
MAX1980’s dual-purpose current-limit input also allows
the slave controller to automatically enter a low-power
standby mode when the master controller shuts down.
The MAX1980 features a driver-disable mode that forces
both gate drivers (DL and DH) low. While the MAX1980’s
drivers are disabled, the master controller can operate in
low-power skip mode, improving light-load efficiency.
Additionally, the MAX1980 includes selectable trigger
polarity, allowing the slave controller to trigger on the ris-
ing (out-of-phase) or falling (in-phase) edge of the mas-
ter’s low-side gate driver. Out-of-phase operation
staggers the master and slave’s on-times, reducing the
input ripple current and consequently the number of
input capacitors. The MAX1980 also features a selec-
table 200kHz/300kHz/550kHz switching frequency. The
MAX1980 is available in compact 20-pin 5mm
QFN and thin QFN packages.
19-2298; Rev 2; 9/02
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
Driver Disable for Multiphase DC-DC Converter
Notebook Computers
CPU Core Supply
Single-Stage (BATT to V
Two-Stage (5V to V
Servers/Desktop Computers
________________________________________________________________ Maxim Integrated Products
General Description
CORE
CORE
) Converters
™
step-down controllers
Applications
) Converters
Quick-PWM Slave Controller with
✕
5mm
o Quick-PWM Slave Controller
o Precise, Active Current Balance (±1.25mV )
o Driver Disable Improves Light Load Efficiency
o Accurate, Adjustable Current-Limit Threshold
o Optimized for Low-Output Voltages (≤ 2V)
o 4V to 28V Battery Input Range
o Selectable 200kHz/300kHz/550kHz Switching
o Drive Large Synchronous-Rectifier MOSFETs
o 525µA (typ) I
o 20µA Standby Supply Current
o Compact 20-Pin 5mm
*Contact factory for availability.
Typical Operating Circuit appears at end of data sheet.
MAX1980EGP*
MAX1980ETP
Frequency
Packages
TOP VIEW
PART
CM+
CM-
TON
CS+
CS-
1
2
3
4
5
CC
-40°C to +100°C
-40°C to +100°C
20
TEMP RANGE
Supply Current
6
QFN/THIN QFN
Ordering Information
5mm x 5mm
19
7
MAX1980
✕
18
8
5mm QFN and Thin QFN
Pin Configuration
17
9
10
16
PIN-PACKAGE
20 QFN (5mm x 5mm)
20 Thin QFN
(5mm x 5mm)
15
14
13
12
11
Features
LX
DH
DD
V
V
CC
DD
1

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MAX1980ETP+ Summary of contents

Page 1

... Single-Stage (BATT to V CORE Two-Stage ( Converters CORE Servers/Desktop Computers Quick-PWM is a trademark of Maxim Integrated Products, Inc. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Quick-PWM Slave Controller with o Quick-PWM Slave Controller o Precise, Active Current Balance (± ...

Page 2

Quick-PWM Slave Controller with Driver Disable for Multiphase DC-DC Converter ABSOLUTE MAXIMUM RATINGS V+ to GND ..............................................................-0.3V to +30V GND .....................................................-0. PGND to GND.....................................................................±0.3V TRIG, LIMIT to GND .................................................-0.3V to +6V DD ...

Page 3

Driver Disable for Multiphase DC-DC Converter ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 15V +85°C, unless otherwise noted. Typical values are at T PARAMETER SYMBOL CURRENT SENSING On-Time Adjustment Range COMP Output Current I ...

Page 4

Quick-PWM Slave Controller with Driver Disable for Multiphase DC-DC Converter ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 15V +85°C, unless otherwise noted. Typical values are at T PARAMETER SYMBOL LOGIC POL Logic Levels ...

Page 5

Driver Disable for Multiphase DC-DC Converter ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 15V +100°C, unless otherwise noted.) (Note 5) PARAMETER SYMBOL CURRENT SENSING On-Time Adjustment Range COMP Output Current I Current-Balance Offset ...

Page 6

Quick-PWM Slave Controller with Driver Disable for Multiphase DC-DC Converter (Circuit of Figure 12V TWO-PHASE EFFICIENCY vs. LOAD CURRENT (V = 1.3V) OUT 100 ...

Page 7

Driver Disable for Multiphase DC-DC Converter (Circuit of Figure 12V OFFSET-VOLTAGE DEVIATION vs. COMPENSATION VOLTAGE 0.3 OUT = CM+ = CM- = CS+ = CS- 0.2 0.1 0 -0.1 -0.2 -0.3 0 ...

Page 8

Quick-PWM Slave Controller with Driver Disable for Multiphase DC-DC Converter (Circuit of Figure 12V SWITCHING WAVEFORMS (OUT-OF-PHASE) 20A 10V 0 1µs/div A. OUTPUT VOLTAGE 1.290V (NO LOAD), OUT B. MASTER/SLAVE ...

Page 9

Driver Disable for Multiphase DC-DC Converter (Circuit of Figure 12V DYNAMIC OUTPUT-VOLTAGE TRANSITION 5.00V 0 1.30V 1.10V 0 0 40µs/div A. ZMODE = OUTPUT VOLTAGE 1.30V ...

Page 10

Quick-PWM Slave Controller with Driver Disable for Multiphase DC-DC Converter PIN NAME 1 CM+ Master Controller’s Positive Current-Sense Input 2 CM- Master Controller’s Negative Current-Sense Input On-Time Selection Control Input. This is a three-level input used to determine the DH ...

Page 11

Driver Disable for Multiphase DC-DC Converter PIN NAME Battery Voltage Sense Connection. Connect V+ to the input power source used only for PWM one shot timing (see the On-Time Control and Active Current Balancing section). Open-Drain ...

Page 12

Quick-PWM Slave Controller with Driver Disable for Multiphase DC-DC Converter Table 2. Component Suppliers MANUFACTURER MOSFETS Fairchild Semiconductor International Rectifier Siliconix CAPACITORS Kemet Panasonic Sanyo Taiyo Yuden INDUCTORS Coilcraft Coiltronics Sumida The trigger input’s polarity is selected by connecting POL ...

Page 13

Driver Disable for Multiphase DC-DC Converter OPTIONAL LOW-POWER LOGIC OFF 5V BIAS ON SUPPLY R22 R24 30kΩ 100kΩ R23 20kΩ R25 10kΩ C10 5V BIAS 1000pF SUPPLY 1µF 5V BIAS SUPPLY FLOAT (300kHz) (MASTER) R18 1kΩ LOW POWER C9 1000pF ...

Page 14

Quick-PWM Slave Controller with Driver Disable for Multiphase DC-DC Converter ILIM STANDBY 0.25V V CC CONTROLLER CONTROLLER BIAS TON V+ COMP CS- GMS CS+ CM+ GMM CM- LIMIT POSITIVE CM LIMIT Figure 2. Functional Diagram In-Phase and Out-of-Phase Operation Multiphase ...

Page 15

Driver Disable for Multiphase DC-DC Converter η (V < the input currents of the overlapping IN OUT phases may sum together, increasing the total input and output ripple voltage and RMS ripple current. During in-phase operation, the input ...

Page 16

Quick-PWM Slave Controller with Driver Disable for Multiphase DC-DC Converter Table 4. Operating Mode Truth Table DD ILIM DL High V Switching CC (> 0.25V) High GND Low (> 0.25V) GND X Low (< 0.25V Don’t Care When ...

Page 17

Driver Disable for Multiphase DC-DC Converter LIMIT(VALLEY) LOAD(MAX) 0 TIME Figure 3. “Valley” Current-Limit Threshold Point guarantee full-load operation under worst-case condi- tions. Furthermore, the inaccurate current limit mandates the use of MOSFETs and inductors with excessively ...

Page 18

Quick-PWM Slave Controller with Driver Disable for Multiphase DC-DC Converter Undervoltage Lockout During startup, the V undervoltage lockout (UVLO) CC circuitry forces the DL and the DH gate drivers low, inhibiting switching until an adequate supply voltage is reached. Once ...

Page 19

Driver Disable for Multiphase DC-DC Converter Inductor Selection The switching frequency and operating point (% ripple or LIR) determine the inductor value as follows OUT IN OUT = ...

Page 20

Quick-PWM Slave Controller with Driver Disable for Multiphase DC-DC Converter SLAVE CONTROLLER R C ILIM R D MAX1980 R LIMIT LIMIT C LIMIT Figure 5. Setting the Adjustable Current Limits where V , the master’s current-limit threshold, is typ- ITHM ...

Page 21

Driver Disable for Multiphase DC-DC Converter Current Limit Design Example For the typical application circuit shown in Figure 12V 1.3V 300kHz, OUT SW = 50A 0.6µ 6mΩ, R DS(ON)(MAX) ...

Page 22

Quick-PWM Slave Controller with Driver Disable for Multiphase DC-DC Converter SLAVE CURRENT-LIMIT VOLTAGES vs. AVERAGE INDUCTOR CURRENT 160 140 120 100 AVERAGE INDUCTOR CURRENT (A) MASTER CURRENT-LIMIT VOLTAGES vs. AVERAGE INDUCTOR CURRENT 160 ...

Page 23

Driver Disable for Multiphase DC-DC Converter For in-phase operation, the maximum ESR to meet rip- ple requirements is: V RIPPLE ≤ ESR    η I LIR LOAD MAX ( )       ...

Page 24

Quick-PWM Slave Controller with Driver Disable for Multiphase DC-DC Converter If the master/slave converter is operated as the second stage of a two-stage power-conversion system, tanta- lum input capacitors are acceptable. In either configu- ration, choose an input capacitor that ...

Page 25

Driver Disable for Multiphase DC-DC Converter Current-Balance Compensation (COMP) The current-balance compensation capacitor (C integrates the difference of the master and slave cur- rent-sense signals, while the compensation resistor improves transient response by increasing the phase margin. This allows the ...

Page 26

Quick-PWM Slave Controller with Driver Disable for Multiphase DC-DC Converter VOLTAGE POSITIONING THE OUTPUT 1.4V 1.4V A. CONVENTIONAL CONVERTER (50mV/div) B. VOLTAGE-POSITIONED OUTPUT (50mV/div) Figure 8. Voltage Positioning the Output limit allows the use of fewer output capacitors and reduces ...

Page 27

Driver Disable for Multiphase DC-DC Converter One-Stage (Battery Input) vs. Two-Stage (5V Input) Applications The MAX1980 can be used with a direct battery con- nection (one stage) or can obtain power from a regulat supply (two-stage). Each approach ...

Page 28

Quick-PWM Slave Controller with Driver Disable for Multiphase DC-DC Converter MAX1718 (MASTER) MASTER LM VIA TO CM+ AND VIA TO CM MASTER Figure 10. Power-Stage PC Board Layout Example 28 ______________________________________________________________________________________ MAX1980 (SLAVE) VIA TO ...

Page 29

Driver Disable for Multiphase DC-DC Converter REF (MASTER) FLOAT (300kHz) ILIM (MASTER) FB (MASTER) side MOSFET or between the inductor and the out- put filter capacitor. 8) Route high-speed switching nodes away from sen- sitive analog areas (COMP, ILIM). Make ...

Page 30

Quick-PWM Slave Controller with Driver Disable for Multiphase DC-DC Converter (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) 30 ______________________________________________________________________________________ Package Information ...

Page 31

Driver Disable for Multiphase DC-DC Converter (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) ______________________________________________________________________________________ Quick-PWM Slave Controller with Package Information (continued) 31 ...

Page 32

Quick-PWM Slave Controller with Driver Disable for Multiphase DC-DC Converter (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) 32 ______________________________________________________________________________________ Package Information (continued) ...

Page 33

... 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 ____________________ 33 © 2002 Maxim Integrated Products ...

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