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19-2419; Rev 2; 5/03
7.6A, 12ns, SOT23 MOSFET Driver
General Description
The MAX5048A/MAX5048B are high-speed MOSFET drivers capable of sinking/sourcing 7.6A/1.3A peak currents. These devices take logic input signals and drive a large external MOSFET. The MAX5048A/MAX5048B have inverting and noninverting inputs that give the user greater flexibility in controlling the MOSFET. They feature two separate outputs working in complementary mode, offering flexibility in controlling both turn-on and turn-off switching speeds. The MAX5048A/MAX5048B have internal logic circuitry, which prevents shoot-through during output state changes. The logic inputs are protected against voltage spikes up to +14V, regardless of V+ voltage. Propagation delay time is minimized and matched between the inverting and noninverting inputs. The MAX5048A/MAX5048B have very fast switching times combined with very short propagation delays (12ns typ), making them ideal for high-frequency circuits. The MAX5048A/MAX5048B operate from a +4V to +12.6V single power supply and typically consume 0.95mA of supply current. The MAX5048A has CMOS input logic levels, while the MAX5048B has standard TTL input logic levels. These devices are available in a space-saving 6-pin SOT23 package.
Features
o Independent Source-and-Sink Outputs for Controllable Rise and Fall Times o +4V to +12.6V Single Power Supply o 7.6A/1.3A Peak Sink/Source Drive Current o 0.23 Open-Drain N-Channel Sink Output o 2 Open-Drain P-Channel Source Output o 12ns (typ) Propagation Delay o Matching Delay Time Between Inverting and Noninverting Inputs o VCC/2 CMOS (MAX5048A)/TTL (MAX5048B) Logic Inputs o 1.6V Input Hysteresis o Up to +14V Logic Inputs (Regardless of V+ Voltage) o Low Input Capacitance: 2.5pF (typ) o -40C to +125C Operating Temperature Range o 6-Pin SOT23 Package
MAX5048
Applications
Power MOSFET Switching Switch-Mode Power Supplies DC-DC Converters Motor Control Power-Supply Modules
PART
Ordering Information
TEMP RANGE PINLOGIC TOP PACKAGE INPUT MARK VCC/2 ABEC CMOS TTL ABED
MAX5048AAUT-T -40C to +125C 6 SOT23-6 MAX5048BAUT-T -40C to +125C 6 SOT23-6
Typical Operating Circuit
TOP VIEW
V+ P_OUT V+ 1
Pin Configuration
V+
MAX5048A MAX5048B
IN+ N_OUT N
6
IN+
P_OUT 2
MAX5048A MAX5048B
5
IN-
INGND
N_OUT 3
4
GND
SOT23
________________________________________________________________ Maxim Integrated Products
1
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.
7.6A, 12ns, SOT23 MOSFET Driver MAX5048
ABSOLUTE MAXIMUM RATINGS
Voltages Referenced to GND V+ ...........................................................................-0.3V to +13V IN+, IN-...................................................................-0.3V to +14V N_OUT, P_OUT ............................................-0.3V to (V+ + 0.3V) N_OUT Continuous Output Current (Note 1) ....................390mA P_OUT Continuous Output Current (Note 1).....................100mA Continuous Power Dissipation (TA = +70C) 6-Pin SOT23 (derate 9.1mW/C above +70C)............727mW Junction to Case Thermal Resistance, JC ......................75C/W Operating Temperature Range .........................-40C to +125C Storage Temperature Range .............................-65C to +150C Junction Temperature ......................................................+150C Lead Temperature (soldering, 10s) .................................+300C
Note 1: Continuous output current is limited by the power dissipation of the SOT23 package.
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.
ELECTRICAL CHARACTERISTICS
(V+ = +12V, TA = -40C to +125C, unless otherwise noted. Typical values are at TA = +25C.) (Note 2)
PARAMETER POWER SUPPLY V+ Operating Range V+ Undervoltage Lockout V+ Undervoltage Lockout Hysteresis V+ Undervoltage Lockout to Output Delay Time V+ Supply Current N-CHANNEL OUTPUT Driver Output Resistance-- Pulling Down Power-Off Pulldown Resistance Power-Off Pulldown Clamp Voltage Output Leakage Current Peak Output Current (Sinking) P-CHANNEL OUTPUT Driver Output Resistance-- Pulling Up Output Leakage Current Peak Output Current (Sourcing) LOGIC INPUT Logic 1 Input Voltage Logic 0 Input Voltage VIH VIL MAX5048A MAX5048B MAX5048A MAX5048B 0.67 x V+ 2.4 0.33 x V+ 0.8 V V V+ = +10V, IP-OUT = 50mA V+ = +4.5V, IP-OUT = 50mA P_OUT = 0 CL = 10,000pF TA = +25C TA = +125C TA = +25C TA = +125C 2.00 2.85 2.20 3.10 0.001 1.3 3.00 4.30 3.30 4.70 10 A A ILK-N IPK-N V+ = +10V, IN-OUT = -100mA V+ = +4.5V, IN-OUT = -100mA TA = +25C TA = +125C TA = +25C TA = +125C 0.23 0.38 0.24 0.40 3.3 0.85 6.85 7.6 0.26 0.43 0.28 0.47 10 1.0 20 V A A I+ V+ rising IN+ = IN- = V+ V+ UVLO V+ rising 4.0 3.25 3.6 400 300 0.95 1.5 12.6 4.00 V V mV ns mA SYMBOL CONDITIONS MIN TYP MAX UNITS
RON-N
V+ = 0 or floating, IN-OUT = -10mA, TA = +25C V+ = 0 or floating, IN-OUT = -10mA, TA = +25C N_OUT = V+ CL = 10,000pF
RON-P
ILK-P IPK-P
2
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7.6A, 12ns, SOT23 MOSFET Driver
ELECTRICAL CHARACTERISTICS (continued)
(V+ = +12V, TA = -40C to +125C, unless otherwise noted. Typical values are at TA = +25C.) (Note 2)
PARAMETER Logic Input Hysteresis Logic Input Current Input Capacitance CIN CL = 1000pF Rise Time tR CL = 5000pF CL = 10,000pF CL = 1000pF Fall Time Turn-On Propagation Delay Time Turn-Off Propagation Delay Time Break-Before-Make Time SWITCHING CHARACTERISTICS FOR V+ = +4.5V CL = 1000pF Rise Time tR CL = 5000pF CL = 10,000pF CL = 1000pF Fall Time Turn-On Propagation Delay Time Turn-Off Propagation Delay Time Break-Before-Make Time tF tD-ON tD-OFF CL = 5000pF CL = 10,000pF Figure 1, CL = 1000pF (Note 3) Figure 1, CL = 1000pF (Note 3) 8 8 12 41 74 3.0 7.0 11.3 14 14 4.2 27 27 ns ns ns ns ns tF tD-ON tD-OFF CL = 5000pF CL = 10,000pF Figure 1, CL = 1000pF (Note 3) Figure 1, CL = 1000pF (Note 3) 7 7 SYMBOL VHYS MAX5048A MAX5048B VIN_ = V+ or 0 CONDITIONS MIN TYP 1.6 0.68 0.001 2.5 8 45 82 3.2 7.5 12.5 12 12 2.5 25 25 ns ns ns ns ns 10 MAX UNITS V A pF
MAX5048
SWITCHING CHARACTERISTICS FOR V+ = +10V
Note 2: All DC specifications are 100% tested at TA = +25C. Specifications over -40C to +125C are guaranteed by design. Note 3: Guaranteed by design, not production tested.
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3
7.6A, 12ns, SOT23 MOSFET Driver MAX5048
Typical Operating Characteristics
(CL = 1000pF, TA = +25C, unless otherwise noted.)
PROPAGATION DELAY TIME, LOW-TO-HIGH vs. SUPPLY VOLTAGE
MAX5048 toc02
RISE TIME vs. SUPPLY VOLTAGE
MAX5048 toc01
FALL TIME vs. SUPPLY VOLTAGE
6.0 TA = +125C 5.5 5.0 FALL TIME (ns) TA = +85C 20
TA = +125C PROPAGATION DELAY (ns) 18 TA = +85C TA = +25C 16 TA = 0C TA = -40C
17 RISE TIME (ns)
TA = +125C TA = +85C TA = 0C TA = -40C
14
TA = +25C
4.5 4.0 3.5 3.0 2.5 TA = +25C TA = 0C TA = -40C
11
14
8
12
5 4 6 8 SUPPLY VOLTAGE (V) 10 12
2.0 4 6 8 SUPPLY VOLTAGE (V) 10 12
10 4 6 8 SUPPLY VOLTAGE (V) 10 12
PROPAGATION DELAY TIME, HIGH-TO-LOW vs. SUPPLY VOLTAGE
MAX5048 toc04
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX5048 toc05
SUPPLY CURRENT vs. LOAD CAPACITANCE
3.5 SUPPLY CURRENT (mA) 3.0 2.5 2.0 1.5 1.0 0.5 0 V+ = +10V f = 100kHz DUTY CYCLE = 50%
MAX5048 toc06
20 TA = +125C TA = +85C 16 TA = +25C 14 TA = 0C TA = -40C
12 10 SUPPLY CURRENT (mA) 8 1MHz 6 500kHz 4 100kHz 2 0 75kHz 40kHz DUTY CYCLE = 50% V+ = +10V, CL = 0
4.0
PROPAGATION DELAY (ns)
18
12
10 4 6 8 SUPPLY VOLTAGE (V) 10 12
4
6
8 SUPPLY VOLTAGE (V)
10
12
0
400
800
1200
1600
2000
LOAD CAPACITANCE (pF)
SUPPLY CURRENT vs. TEMPERATURE
MAX5048 toc07
MAX5048A INPUT THRESHOLD VOLTAGE vs. SUPPLY VOLTAGE
MAX5048 toc08
MAX5048A SUPPLY CURRENT vs. INPUT VOLTAGE
1.7 1.6 SUPPLY CURRENT (mA) 1.5 1.4 1.3 1.2 1.1 1.0 0.9 0.8 INPUT HIGH-TO-LOW INPUT LOW-TO-HIGH
MAX5048 toc09
1.8 1.7 SUPPLY CURRENT (mA) 1.6 1.5 1.4 1.3 1.2 -50
INPUT THRESHOLD VOLTAGE (V)
V+ = +10V f = 100kHz, CL = 0 DUTY CYCLE = 50%
8 7 6 5 4 3 2 1 0 FALLING RISING
1.8
-25
0
25
50
75
100
125
4
6
8 SUPPLY VOLTAGE (V)
10
12
0
2
4
6
8
10
12
TEMPERATURE (C)
INPUT VOLTAGE (V)
4
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MAX5048 toc03
20
7.6A, 12ns, SOT23 MOSFET Driver
Typical Operating Characteristics (continued)
(CL = 1000pF, TA = +25C, unless otherwise noted.)
MAX5048
INPUT VOLTAGE vs. OUTPUT VOLTAGE (V+ = +4V, CL = 5000pF)
MAX5048 toc10
INPUT VOLTAGE vs. OUTPUT VOLTAGE (V+ = +4V, CL = 10,000pF)
MAX5048 toc11
INPUT VOLTAGE vs. OUTPUT VOLTAGE (V+ = +4V, CL = 5000pF)
MAX5048 toc12
IN+ 2V/div
IN+ 2V/div IN+ 2V/div
OUTPUT 2V/div
OUTPUT 2V/div OUTPUT 2V/div
20ns/div
20ns/div
20ns/div
INPUT VOLTAGE vs. OUTPUT VOLTAGE (V+ = +4V, CL = 10,000pF)
MAX5048 toc13
INPUT VOLTAGE vs. OUTPUT VOLTAGE (V+ = +12V, CL = 5000pF)
MAX5048 toc14
INPUT VOLTAGE vs. OUTPUT VOLTAGE (V+ = +12V, CL = 10,000pF)
MAX5048 toc15
IN+ 5V/div IN+ 2V/div
IN+ 5V/div
OUTPUT 2V/div
OUTPUT 5V/div
OUTPUT 5V/div
20ns/div
20ns/div
20ns/div
INPUT VOLTAGE vs. OUTPUT VOLTAGE (V+ = +12V, CL = 5000pF)
MAX5048 toc16
INPUT VOLTAGE vs. OUTPUT VOLTAGE (V+ = +12V, CL = 10,000pF)
MAX5048 toc17
IN+ 5V/div
IN+ 5V/div
OUTPUT 5V/div
OUTPUT 5V/div
20ns/div
20ns/div
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5
7.6A, 12ns, SOT23 MOSFET Driver MAX5048
Pin Description
PIN 1 2 3 4 5 6 NAME V+ P_OUT N_OUT GND ININ+ FUNCTION Power Supply. Bypass to GND with a 0.1F ceramic capacitor. P-Channel Open-Drain Output. Sources current for MOSFET turn on. N-Channel Open-Drain Output. Sinks current for MOSFET turn off. Ground Inverting Logic Input Terminal. Connect to GND when not used. Noninverting Logic Input Terminal. Connect to V+ when not used.
Undervoltage Lockout (UVLO)
When V+ is below the UVLO threshold, the N-channel is ON and the P-channel is OFF, independent of the state of the inputs. The UVLO is typically 3.6V with 400mV typical hysteresis to avoid chattering.
Driver Outputs
The MAX5048A/MAX5048B provide two separate outputs. One is an open-drain P-channel, the other an open-drain N-channel. They have distinct current sourcing/sinking capabilities to independently control the rise and fall times of the MOSFET gate. Add a resistor in series with P_OUT/N_OUT to slow the corresponding rise/fall time of the MOSFET gate.
Applications Information
Supply Bypassing, Device Grounding, and Placement
Ample supply bypassing and device grounding are extremely important because when large external capacitive loads are driven, the peak current at the V+ pin can approach 1.3A, while at the GND pin the peak current can approach 7.6A. VCC drops and ground shifts are forms of negative feedback for inverters and, if excessive, can cause multiple switching when the INinput is used and the input slew rate is low. The device driving the input should be referenced to the MAX5048A/MAX5048B GND pin especially when the INinput is used. Ground shifts due to insufficient device grounding may disturb other circuits sharing the same AC ground return path. Any series inductance in the V+, P_OUT, N_OUT and/or GND paths can cause oscillations due to the very high di/dt that results when the MAX5048A/MAX5048B are switched with any capacitive load. A 0.1F or larger value ceramic capacitor is recommended bypassing V+ to GND and placed as close to the pins as possible. When driving very large loads (e.g., 10nF) at minimum rise time, 10F or more of parallel storage capacitance is recommended. A ground plane is highly recommended to minimize ground return resistance and series inductance. Care should be taken to place the MAX5048A/MAX5048B as close as possible to the external MOSFET being driven to further minimize board inductance and AC path resistance.
Detailed Description
Logic Inputs
The MAX5048A/MAX5048Bs' logic inputs are protected against voltage spikes up to +14V, regardless of the V+ voltage. The low 2.5pF input capacitance of the inputs reduces loading and increases switching speed. These devices have two inputs that give the user greater flexibility in controlling the MOSFET. Table 1 shows all possible input combinations. The difference between the MAX5048A and the MAX5048B is the input threshold voltage. The MAX5048A has VCC/2 CMOS logic-level thresholds, while the MAX5048B has TTL logic-level thresholds (see the Electrical Characteristics). For V+ above 5.5V, VIH (typ) = 0.5x(V+) + 0.8V and VIL (typ) = 0.5x(V+) - 0.8V. As V+ is reduced from 5.5V to 4V, VIH and VIL gradually approach VIH (typ) = 0.5x(V+) + 0.65V and VIL (typ) = 0.5x(V+) - 0.65V. Connect IN+ to V+ or IN- to GND when not used. Alternatively, the unused input can be used as an ON/OFF pin (see Table 1).
Table 1. Truth Table
IN+ L L H H INL H L H P-CHANNEL OFF OFF ON OFF N-CHANNEL ON ON OFF ON
Power Dissipation
Power dissipation of the MAX5048A/MAX5048B consists of three components, caused by the quiescent current, capacitive charge and discharge of internal nodes, and the output current (either capacitive or resistive load). The sum of these components must be kept below the maximum power-dissipation limit.
L = Logic low H = Logic high
6
_______________________________________________________________________________________
7.6A, 12ns, SOT23 MOSFET Driver MAX5048
IN+ VIH VIL
P_OUT AND N_OUT TIED TOGETHER
90%
10% tD-OFF tF TIMING DIAGRAM tD-ON tR
V+
V+
MAX5048A MAX5048B
INPUT IN+ P_OUT N_OUT INGND CL OUTPUT
TEST CIRCUIT
Figure 1. Timing Diagram and Test Circuit
The quiescent current is 0.95mA typical. The current required to charge and discharge the internal nodes is frequency dependent (see the Typical Operating Characteristics). The MAX5048A/MAX5048B power dissipation when driving a ground referenced resistive load is: P = D x RON(MAX) x ILOAD2 where D is the fraction of the period the MAX5048A/ MAX5048Bs' output pulls high, RON (MAX) is the maximum on-resistance of the device with the output high (P-channel), and ILOAD is the output load current of the MAX5048A/MAX5048B. For capacitive loads, the power dissipation is: P = CLOAD x (V+)2 x FREQ where CLOAD is the capacitive load, V+ is the supply voltage, and FREQ is the switching frequency.
following PC board layout guidelines are recommended when designing with the MAX5048A/MAX5048B: * Place one or more 0.1F decoupling ceramic capacitor(s) from V+ to GND as close to the device as possible. At least one storage capacitor of 10F (min) should be located on the PC board with a low resistance path to the V+ pin of the MAX5048A/MAX5048B. * There are two AC current loops formed between the device and the gate of the MOSFET being driven. The MOSFET looks like a large capacitance from gate to source when the gate is being pulled low. The active current loop is from N_OUT of the MAX5048A/MAX5048B to the MOSFET gate to the MOSFET source and to GND of the MAX5048A/ MAX5048B. When the gate of the MOSFET is being pulled high, the active current loop is from P_OUT of the MAX5048A/MAX5048B to the MOSFET gate to the MOSFET source to the GND terminal of the decoupling capacitor to the V+ terminal of the decoupling capacitor and to the V+ terminal of the MAX5048A/MAX5048B. While the charging current loop is important, the discharging current loop is critical. It is important to minimize the physical distance and the impedance in these AC current paths.
7
Layout Information
The MOSFET drivers MAX5048A/MAX5048B sourceand-sink large currents to create very fast rise and fall edges at the gate of the switching MOSFET. The high di/dt can cause unacceptable ringing if the trace lengths and impedances are not well controlled. The
_______________________________________________________________________________________
7.6A, 12ns, SOT23 MOSFET Driver MAX5048
* In a multilayer PC board, the component surface layer surrounding the MAX5048A/MAX5048B should consist of a GND plane containing the discharging and charging current loops.
Chip Information
TRANSISTOR COUNT: 676 PROCESS: BiCMOS
VS
V+
MAX5048A MAX5048B
P INBREAKBEFOREMAKE CONTROL N P_OUT N_OUT
V+ (4V TO 12.6V)
V+
P_OUT
MAX5048A MAX5048B
IN+ N_OUT
IN+
GND
INGND
Figure 2. MAX5048A/MAX5048B Functional Diagram
Figure 3. Noninverting Application
4V TO 12V
VS
IN+ V+ P_OUT P
MAX5048A/ MAX5048B
V+ (4V TO 12.6V)
N_OUT
V+
P_OUT
VOUT
FROM PWM CONTROLLER (BUCK)
INGND VOUT IN+ V+ P_OUT
FROM PWM CONTROLLER (BOOST)
MAX5048A MAX5048B
IN+ N_OUT
INGND
MAX5048A MAX5048B
N_OUT INGND N
Figure 4. Boost Converter
Figure 5. MAX5048A/MAX5048B in High-Power Synchronous Buck Converter
8
_______________________________________________________________________________________
7.6A, 12ns, SOT23 MOSFET Driver
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
6LSOT.EPS
MAX5048
PACKAGE OUTLINE, SOT-23, 6L
21-0058
F
1 1
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 _____________________ 9 (c) 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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