MAX17491GTA+-MAX17491GTA+T Fast Delivery |IC PHOENIX CO.,LIMITED

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MAX17491GTA+-MAX17491GTA+T
Single-Phase Synchronous MOSFET Driver
MAX17491
Single-Phase Synchronous MOSFET Driver
19-5324; Rev 0; 6/10
EVALUATION KIT
AVAILABLE
SKIP
PWM
BST
GND
TQFN
MAX17491
TOP VIEW
Pin Configuration
MAX17491
PWMDH
BST
GND
PAD
PWM
+5V BIAS
SUPPLY
SKIPSKIP
VDD
INPUT (VIN)
5V TO 24V
VOUT (1.45V
AT 20A)
Typical Operating Circuit
General Description
The MAX17491 is a single-phase synchronous nonin-
verting MOSFET driver. The MAX17491 is intended to
work with controller ICs like the MAX8736, MAX8786, or
MAX17030 in multiphase notebook CPU core regulators.
The regulators can either step down directly from the
battery voltage to create the core voltage or step down
from the main system supply. The single-stage conver-
sion method allows the highest possible efficiency, while
the 2-stage conversion at higher switching frequency
provides the minimum possible physical size.
The low-side driver is optimized to drive 3nF capacitive
loads with 4ns/8ns typical fall/rise times, and the high-
side driver with 8ns/10ns typical fall/rise times.
Adaptive dead-time control prevents shoot-through cur-
rents and maximizes converter efficiency.
The MAX17491 features improved zero crossing and
UVLO performance over the MAX8791/MAX8791B.
The MAX17491 is available in a small, lead-free, 8-pin,
3mm x 3mm TQFN package.
Applications
Notebooks/Desktops/Servers
CPU Core Power Supplies
Multiphase Step-Down Converters
FeaturesSingle-Phase Synchronous MOSFET Driver0.5ΩLow-Side On-Resistance0.7ΩHigh-Side On-Resistance10ns Minimum Guaranteed Dead TimeIntegrated Boost “Diode”2V to 24V Input Voltage RangeSelectable Pulse-Skipping ModeLow-Profile, 3mm x 3mm, TQFN Package
Ordering Information
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
PARTTEMP RANGEPIN-PACKAGE
MAX17491GTA+ -40°C to +105°C 8 TQFN-EP*
MAX17491
Single-Phase Synchronous MOSFET Driver
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(Circuit of Figure1, VDD= VSKIP= 5V, TA= -40°C to +105°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
VDDto GND...............…………………….………….. -0.3V to +6V
SKIPto GND..................………………………………-0.3V to +6V
PWM to GND................……………………………….-0.3V to +6V
DL to GND..................................................-0.3V to (VDD+ 0.3V)
BST to GND............................................................-0.3V to +36V
DH to LX....................................................-0.3V to (VBST+ 0.3V)
BST to VDD.............................................................-0.3V to +30V
BST to LX................…………………………………...-0.3V to +6V
Continuous Power Dissipation
8-Pin 3mm x 3mm TQFN
(derate 23.8mW/°C above +70°C).............................1904mW
Operating Temperature Range.........................-40°C to +105°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
Soldering Temperature (reflow).......................................+260°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Input Voltage Range VDD 4.20 5.50 V
Rising edge, PWM disabled below this level 3.7 4.05 VDD Undervoltage-
Lockout Threshold VUVLO(VDD) Falling edge, PWM disabled below this level 3.30 3.40 3.75 V
PWM = open; after the shutdown hold time has expired 0.08 0.20
SKIP = GND, PWM = GND, LX = GND (after zero
crossing); this state should be equivalent to low-
power standby if LX = GND
0.15 0.30 Quiescent Supply
Current (VDD)IDD
SKIP = GND or VDD, PWM = VDD, VBST = 5V 0.35 0.70
mA
DRIVERS
tON(MIN) Minimum on-time 50
PWM Pulse Width tOFF(MIN)Minimum off-time; required to allow the zero-crossing
comparator time to settle to the proper state 300 ns
DL Propagation Delay tPWM-DL PWM high-to-DL low 15 ns
DH Propagation Delay tPWM-DH PWM low-to-DH low 17 ns
TA = 0°C to +85°C 10 DL-to-DH Dead Time tDL-DH DL falling to DH rising TA = -40°C to +105°C 10 ns
TA = 0°C to +85°C 10 DH-to-DL Dead Time tDH-DL DH falling to DL rising TA = -40°C to +105°C 10 ns
tF_DL Falling, 3.0nF load 10 DL Transition Time tR_DL Rising, 3.0nF load 12 ns
tF_DH Falling, 3.0nF load 8 DH Transition Time tR_DH Rising, 3.0nF load 10 ns
DH, high state (pullup) 0.9 2.5 DH Driver
On-Resistance RON(DH) BST - LX forced to 5V
DH, low state (pulldown) 0.7 2.1
DL, high state (pullup) 0.7 1.6 DL Driver
On-Resistance RON(DL)DL, low state (pulldown) 0.3 0.9
DH Driver Source Current IDH_SOURCE DH forced to 2.5V, BST - LX forced to 5V 2.2 A
DH Driver Sink Current IDH_SINK DH forced to 2.5V, BST - LX forced to 5V 2.7 A
DL Driver Source Current IDL_SOURCE DL forced to 2.5V 2.7 A
MAX17491
Single-Phase Synchronous MOSFET Driver
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure1, VDD= VSKIP= 5V, TA= -40°C to +105°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
DL Driver Sink Current IDL_SINK DL forced to 2.5V 8 A
Zero-Crossing Threshold VZX GND - LX, SKIP = GND 1.5 mV
Boost On-Resistance RON(BST) VDD = 5V, DH = LX = GND (pulldown state), IBST = 10mA 5 8
High (DH = high, DL = low) VDD -
0.4
Midlevel VDD/2-
0.4
VDD/2
+ 0.4
PWM Input Levels
Low (DH = low, DL = high) 0.4
Sink; PWM forced to VDD -370 -200 -110 PWM Input Current IPWMSource; PWM forced to GND 110 200 370 μA
Midlevel Shutdown Hold
Time tMID 120 300 600 ns
Rising edge 1.7 2.4 SKIP Input Threshold Falling edge 0.8 1.5 V
SKIP Input Current ISKIP Sink; SKIP forced to 0.8V to VDD, TA = +25°C -4 -2 -0.5 μA
Thermal-Shutdown
Threshold TSHDN Hysteresis = 20°C +160 °C
Note 1:Limits are 100% production tested at TA= +25°C. Maximum and minimum limits over temperature are guaranteed through
correlation using statistical-quality-control (SQC) methods.
Typical Operating Characteristics
(Circuit of Figure1, VDD= 5V, CDH = 3nF, CDL = 3nF, TA = +25°C, unless otherwise noted.)
PACKAGE-POWER DISSIPATION
vs. PWM FREQUENCY
PWM FREQUENCY (kHz)
PD (mW)
MAX17491 toc0120040060080010001200
A: CDH = 3.3nF, CDL = 3.3nF
B: CDH = 1.5nF, CDL = 6.8nF
PACKAGE-POWER DISSIPATION
vs. CAPACITIVE LOAD ON DH AND DL
CAPACITANCE (pF)
PD (mW)
MAX17491 toc02
10002500400055007000850010,000
A: 300kHz
B: 600kHz
C: 1MHz
DL RISE AND FALL TIMES
vs. CAPACITIVE LOAD
CAPACITANCE (pF)
RISE AND FALL TIME (ns)
MAX17491 toc03
10002500400055007000850010,000
RISE TIME
FALL TIME
CDL = CDH
MAX17491
Single-Phase Synchronous MOSFET Driver
Typical Operating Characteristics (continued)
(Circuit of Figure1, VDD= 5V, CDH = 3nF, CDL = 3nF, TA = +25°C, unless otherwise noted.)
DH RISE AND FALL TIMES
vs. CAPACITIVE LOAD
CAPACITANCE (pF)
RISE AND FALL TIME (ns)
MAX17491 toc04
10002500400055007000850010,000
RISE TIME
FALL TIME
CDL = CDH
DH AND DL RISE AND FALL TIMES
vs. TEMPERATURE
TEMPERATURE (°C)
RISE AND FALL TIME (ns)
MAX17491 toc05
DL RISE
DH RISE
DH FALL
DL FALLDL FALL
DL IS DRIVING 2 SI7336ADP
DH IS DRIVING 1 SI7892ADP
PACKAGE-POWER DISSIPATION
vs. PWM FREQUENCY
PWM FREQUENCY (kHz)
PD (mW)
MAX17491 toc0620040060080010001200
A: CDH = 3.3nF, CDL = 3.3nF
B: CDH = 1.5nF, CDL = 6.8nF
PROPAGATION DELAY TIME
vs. TEMPERATURE
TEMPERATURE (°C)
PROPAGATION DELAY TIME (ns)
MAX17491 toc07
PWM FALL TO DH FALL
PWM RISE TO DL FALL
TYPICAL APPLICATION CIRCUIT
SWITCHING WAVEFORMS
MAX17491 toc08
VPWM
VDL
10V/div
20V/div
5V/div
5V/div
100ns/div
VLX
VDH
DH FALL AND DL RISE WAVEFORMS
MAX17491 toc09
VPWM
VDL
10V/div
10V/div
5V/div
5V/div
20ns/div
VLX
VDH
DH RISE AND DL FALL WAVEFORMS
MAX17491 toc10
VPWM
VDL
10V/div
10V/div
5V/div
5V/div
20ns/div
VLX
VDH
MAX17491
Single-Phase Synchronous MOSFET Driver
Pin Description
PIN NAME FUNCTION
1 BST Boost Flying-Capacitor Connection. Gate-drive power supply for DH high-side gate driver. Connect a
0.1μF or 0.22μF capacitor between BST and LX.
2 PWM
PWM Input. Noninverting DH control input from the controller IC:
Logic-high: DH = high (BST), DL = low (PGND).
Midlevel: After the midlevel hold time expires, the controller enters standby mode. DH and DL pulled
low.
Logic-low: DH = low (LX), DL = high (VDD) when SKIP = high.
Internal pullup and pulldown resistors create the midlevel and prevent the controller from triggering an
on-time if this input is left unconnected (not soldered properly) or driven by a high impedance. GND Power Ground for the DL Gate Drivers and Analog Ground. Connect exposed pad to GND. DL PWM Low-Side Gate-Driver Output. Swings between GND and VDD. DL forced high in shutdown.
5 VDDSupply Voltage Input for the DL Gate Drivers. Connect to 4.2V to 5.5V supply and bypass to GND with a
1μF ceramic capacitor. SKIP
Active-Low Pulse-Skipping Mode. Enable pulse-skipping mode (zero-crossing comparator enabled) when
the driver is operating in SKIP mode:
SKIP = VDD PWM mode
SKIP = GND skip mode
An internal pulldown current pulls the controller into the low-power pulse-skipping state if this input is
left unconnected (not soldered properly) or driven by a high impedance.
7 LX Switching Node and Inductor Connection. Low-power supply for the DH high-side gate driver. LX
connects to the skip-mode zero-crossing comparator. DH External High-Side n-Channel MOSFET Gate-Driver Output. Swings between LX and BST. EP Exposed Pad. Connect to ground through multiple vias to reduce the thermal impedance.
Typical Operating Characteristics (continued)
(Circuit of Figure1, VDD= 5V, CDH = 3nF, CDL = 3nF, TA = +25°C, unless otherwise noted.)
SWITCHING WAVEFORMS
(PWM = MID TO LOW TO MID)
MAX17491 toc11
VPWM
VDL
VDH
VLX
5V/div
5V/div
10V/div
10V/div
SWITCHING WAVEFORMS
(PWM = HIGH TO MID TO HIGH)
MAX17491 toc12
VPWM
VDL
VDH
VLX
10V
5V/div
5V/div
10V/div
15V
10V/div
MAX17491
Single-Phase Synchronous MOSFET Driver
PWM
tPWM-DL
tPWM-DH
tF_DL
tR_DHtR_DHtR_DH
tDL-DHtDH-DL
tMID
tMIDtPWM-DH
tPWM-DL
tF_DLtR_DLtR_DL
tR_DH
MAX17491
PWMDH
BST
GND
PAD
PWM
+5V BIAS
SUPPLY
SKIPSKIP
VDD
CBST
0.1μF
1.0μF
CDH
3nFCDL
3nF
Figure1. Test Circuit

Partno	Mfg	Dc	Qty	Available	Descript
MAX17491GTA+ \|MAX17491GTA	MAXIM	N/a	1499	avai	Single-Phase Synchronous MOSFET Driver
MAX17491GTA+T	MAXIM	N/a	2080	avai	Single-Phase Synchronous MOSFET Driver