Rainbow Electronics MAX5048 User Manual

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.

Applications

Power MOSFET Switching

Switch-Mode Power Supplies

DC-DC Converters

Motor Control

Power-Supply Modules

Features

♦ Independent Source-and-Sink Outputs for

Controllable Rise and Fall Times

♦ +4V to +12.6V Single Power Supply

♦ 7.6A/1.3A Peak Sink/Source Drive Current

♦ 0.23Ω Open-Drain N-Channel Sink Output

♦ 2Ω Open-Drain P-Channel Source Output

♦ 12ns (typ) Propagation Delay

♦ Matching Delay Time Between Inverting and

Noninverting Inputs

♦ V

CC

/2 CMOS (MAX5048A)/TTL (MAX5048B) Logic

Inputs

♦ 1.6V Input Hysteresis

♦ Up to +14V Logic Inputs (Regardless of V+

Voltage)

♦ Low Input Capacitance: 2.5pF (typ)

♦ -40°C to +125°C Operating Temperature Range

♦ 6-Pin SOT23 Package

MAX5048

7.6A, 12ns, SOT23 MOSFET Driver

________________________________________________________________ Maxim Integrated Products 1

Pin Configuration

Ordering Information

MAX5048A
MAX5048B

P_OUT

N_OUT

IN-

GND

IN+

V+

V+

N

Typical Operating Circuit

19-2419; Rev 0; 4/02

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.

T

PART TEMP RANGE

MAX5048AAUT-

MAX5048BAUT-T-40°C to +125°C 6 SOT23-6 TTL ABED

-40°C to +125°C 6 SOT23-6

PIN­PACKAGE

LOGIC

INPUT

V

/2

CC

CMOS

TOP

MARK

ABEC

TOP VIEW

V+

P_OUT

16IN+

MAX5048A

2

MAX5048B

34

SOT23

5 IN-

GNDN_OUT

MAX5048

7.6A, 12ns, SOT23 MOSFET Driver

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V+ = +12V, TA= -40°C to +125°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)

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.

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 (T

A

= +70°C)

6-Pin SOT23 (derate 8.7mW/°C above +70°C)............696mW

Operating Temperature Range .........................-40°C to +125°C

Storage Temperature Range .............................-65°C to +150°C

Junction Temperature......................................................+150°C

Lead Temperature (soldering, 10s) .................................+300°C

Note 1: Continuous output current is limited by the power dissipation of the SOT23 package.

POWER SUPPLY

V+ Operating Range V+ 4.0 12.6 V

V+ Undervoltage Lockout UVLO V+ rising 3.25 3.6 4.00 V

V+ Undervoltage Lockout
Hysteresis

V+ Undervoltage Lockout to
Output Delay Time

V+ Supply Current I+ IN+ = IN- = V+ 0.95 1.5 mA

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

V+ rising 300 ns

400 mV

N-CHANNEL OUTPUT

V+ = +10V,
I

Driver Output Resistance—
Pulling Down

Power-Off Pulldown Resistance V+ = 0 or floating, I

Power-Off Pulldown Clamp
Voltage

Output Leakage Current I

Peak Output Current (Sinking) I

P-CHANNEL OUTPUT

Driver Output Resistance—
Pulling Up

Output Leakage Current I

Peak Output Current (Sourcing) I

LOGIC INPUT

Logic 1 Input Voltage V

Logic 0 Input Voltage V

R

R

ON-N

LK-N

PK-N

ON-P

LK-P

PK-P

IH

IL

= -100mA

N-OUT

V+ = +4.5V,
I

= -100mA

N-OUT

V+ = 0 or floating, I

N_OUT = V+ 6.85 20 µA

CL = 10,000pF 7.6 A

V+ = +10V,

= 50mA

I

P-OUT

V+ = +4.5V,

= 50mA

I

P-OUT

P_OUT = 0 0.001 10 µA

CL = 10,000pF 1.3 A

MAX5048A 0.67 x V+

MAX5048B 2.4

MAX5048A 0.33 x V+

MAX5048B 0.8

TA = +25°C 0.23 0.26

T

= +125°C 0.38 0.43

A

TA = +25°C 0.24 0.28

T

= +125°C 0.40 0.47

A

= -10mA 3.3 10 Ω

N-OUT

= -10mA 0.85 1.0 V

N-OUT

TA = +25°C 2.00 3.00

T

= +125°C 2.85 4.30

A

TA = +25°C 2.20 3.30

T

= +125°C 3.10 4.70

A

Ω

Ω

V

V

MAX5048

7.6A, 12ns, SOT23 MOSFET Driver

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(V+ = +12V, TA= -40°C to +125°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)

Note 2: All DC specifications are 100% tested at TA= +25°C. Specifications over -40°C to +125°C are guaranteed by design.
Note 3: Guaranteed by design, not production tested.

Logic Input Hysteresis V

Logic Input Current V

Input Capacitance C

SWITCHING CHARACTERISTICS FOR V+ = +10V

Rise Time t

Fall Time t

Turn-On Propagation Delay Time t

Turn-Off Propagation Delay Time t

Break-Before-Make Time 2.5 ns

SWITCHING CHARACTERISTICS FOR V+ = +4.5V

Fall Time t

Turn-On Propagation Delay Time t

Turn-Off Propagation Delay Time t

Break-Before-Make Time 4.2 ns

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

HYS

D-ON

D-OFF

D-ON

D-OFF

MAX5048A 1.6

MAX5048B 0.68

= V+ or 0 0.001 10 µA

IN_

IN

CL = 1000pF 8

CL = 5000pF 45

R

CL = 10,000pF 82

CL = 1000pF 3.2

CL = 5000pF 7.5

F

CL = 10,000pF 12.5

Figure 1, CL = 1000pF (Note 3) 7 12 25 ns

Figure 1, CL = 1000pF (Note 3) 7 12 25 ns

CL = 1000pF 12

CL = 5000pF 41Rise Time t

R

CL = 10,000pF 74

CL = 1000pF 3.0

CL = 5000pF 7.0

F

CL = 10,000pF 11.3

Figure 1, CL = 1000pF (Note 3) 8 14 27 ns

Figure 1, CL = 1000pF (Note 3) 8 14 27 ns

2.5 pF

V

ns

ns

ns

ns

MAX5048

7.6A, 12ns, SOT23 MOSFET Driver

4 _______________________________________________________________________________________

Typical Operating Characteristics

(CL= 1000pF, TA = +25°C, unless otherwise noted.)

RISE TIME vs. SUPPLY VOLTAGE

MAX5048 toc01

SUPPLY VOLTAGE (V)

RISE TIME (ns)

1086

8

11

14

17

20

5

412

TA = +125°C

TA = 0°C

TA = +85°C

TA = +25°C

TA = -40°C

FALL TIME vs. SUPPLY VOLTAGE

MAX5048 toc02

SUPPLY VOLTAGE (V)

FALL TIME (ns)

1086

2.5

3.5

4.5

5.0

6.0

2.0
412

TA = +125°C

TA = -40°C

TA = 0°C

TA = +85°C

TA = +25°C

3.0

5.5

4.0

MAX5048 toc03

SUPPLY VOLTAGE (V)

PROPAGATION DELAY (ns)

1086

12

14

16

18

20

10

412

TA = +125°C

TA = -40°C

TA = 0°C

TA = +85°C

TA = +25°C

PROPAGATION DELAY TIME, LOW-TO-HIGH

vs. SUPPLY VOLTAGE

MAX5048 toc04

SUPPLY VOLTAGE (V)

PROPAGATION DELAY (ns)

1086

12

14

16

18

20

10

412

TA = +125°C

TA = -40°C

TA = 0°C

TA = +85°C

TA = +25°C

PROPAGATION DELAY TIME, HIGH-TO-LOW

vs. SUPPLY VOLTAGE

SUPPLY CURRENT vs. SUPPLY VOLTAGE

MAX5048 toc05

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (mA)

1086

2

4

6

8

10

12

0

412

DUTY CYCLE = 50%
V+ = +10V, C

L

= 0

1MHz

500kHz

40kHz

75kHz

100kHz

SUPPLY CURRENT vs. LOAD CAPACITANCE

MAX5048 toc06

LOAD CAPACITANCE (pF)

SUPPLY CURRENT (mA)

16001200400 800

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

0

0 2000

V+ = +10V
f = 100kHz
DUTY CYCLE = 50%

SUPPLY CURRENT vs. TEMPERATURE

MAX5048 toc07

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

1007550250-25

1.3

1.4

1.5

1.6

1.7

1.8

1.2

-50 125

V+ = +10V
f = 100kHz, C

L

= 0

DUTY CYCLE = 50%

MAX5048A

INPUT THRESHOLD VOLTAGE

vs. SUPPLY VOLTAGE

MAX5048 toc08

SUPPLY VOLTAGE (V)

INPUT THRESHOLD VOLTAGE (V)

1086

1

2

3

4

5

6

7

8

0

412

RISING

FALLING

MAX5048A

SUPPLY CURRENT vs. INPUT VOLTAGE

MAX5048 toc09

INPUT VOLTAGE (V)

SUPPLY CURRENT (mA)

108642

0.9

1.0

1.1

1.2

1.3

1.4

1.5

1.6

1.7

1.8

0.8
012

INPUT
HIGH-TO-LOW

INPUT
LOW-TO-HIGH

MAX5048

7.6A, 12ns, SOT23 MOSFET Driver

_______________________________________________________________________________________ 5

Typical Operating Characteristics (continued)

(CL= 1000pF, TA = +25°C, unless otherwise noted.)

INPUT VOLTAGE vs. OUTPUT VOLTAGE

20ns/div

= 5000pF)

L

MAX5048 toc10

(V+ = +4V, C

INPUT VOLTAGE vs. OUTPUT VOLTAGE

(V+ = +4V, C

= 10,000pF)

L

MAX5048 toc13

IN+
2V/div

OUTPUT
2V/div

IN+
2V/div

INPUT VOLTAGE vs. OUTPUT VOLTAGE

INPUT VOLTAGE vs. OUTPUT VOLTAGE

(V+ = +4V, C

20ns/div

(V+ = +12V, C

= 10,000pF)

L

= 5000pF)

L

MAX5048 toc11

MAX5048 toc14

IN+
2V/div

OUTPUT
2V/div

IN+
5V/div

INPUT VOLTAGE vs. OUTPUT VOLTAGE

(V+ = +4V, C

L

20ns/div

= 5000pF)

MAX5048 toc12

INPUT VOLTAGE vs. OUTPUT VOLTAGE

(V+ = +12V, C

= 10,000pF)

L

MAX5048 toc15

IN+
2V/div

OUTPUT
2V/div

IN+
5V/div

OUTPUT
5V/div

(V+ = +12V, C

20ns/div

= 10,000pF)

L

MAX5048 toc17

20ns/div

IN+
5V/div

OUTPUT
5V/div

20ns/div

OUTPUT
2V/div

INPUT VOLTAGE vs. OUTPUT VOLTAGE

20ns/div

= 5000pF)

L

MAX5048 toc16

(V+ = +12V, C

20ns/div

IN+
5V/div

OUTPUT
5V/div

INPUT VOLTAGE vs. OUTPUT VOLTAGE

OUTPUT
5V/div

MAX5048

7.6A, 12ns, SOT23 MOSFET Driver

6 _______________________________________________________________________________________

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, V

IH

(typ) = 0.5x(V+) + 0.8V and VIL(typ) = 0.5x(V+) - 0.8V.
As V+ is reduced from 5.5V to 4V, VIHand VILgradually
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).

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. VCCdrops 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 0.1µF 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, 10µF 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.

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.

Pin Description

Table 1. Truth Table

L = Logic low

H = Logic high

PIN NAME FUNCTION

1V+

2 P_OUT

3 N_OUT

4 GND Ground

5 IN-

6 IN+

Power Supply. Bypass to GND with a

0.1µF ceramic capacitor.

P-Channel Open-Drain Output. Sources
current for MOSFET turn on.

N-Channel Open-Drain Output. Sinks
current for MOSFET turn off.

Inverting Logic Input Terminal. Connect
to GND when not used.

Noninverting Logic Input Terminal.
Connect to V+ when not used.

IN+ IN- P-CHANNEL N-CHANNEL

L L OFF ON

L H OFF ON

H L ON OFF

H H OFF ON

MAX5048

7.6A, 12ns, SOT23 MOSFET Driver

_______________________________________________________________________________________ 7

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 R

ON(MAX)

x I

LOAD

2

where D is the fraction of the period the MAX5048A/
MAX5048Bs’ output pulls high, R

ON (MAX)

is the maxi­mum on-resistance of the device with the output high
(P-channel), and I

LOAD

is the output load current of the

MAX5048A/MAX5048B.

For capacitive loads, the power dissipation is:

P = C

LOAD

x (V+)2x FREQ

where C

LOAD

is the capacitive load, V+ is the supply

voltage, and FREQ is the switching frequency.

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

following PC board layout guidelines are recommended
when designing with the MAX5048A/MAX5048B:

• Place one or more 0.1µF decoupling ceramic capaci­tor(s) from V+ to GND as close to the device as possi­ble. At least one storage capacitor of 10µF (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.

Figure 1. Timing Diagram and Test Circuit

IN+

V

IL

P_OUT AND

N_OUT

TIED

TOGETHER

t

D–OFF

90%

10%

INPUT

V

IH

t

F

TIMING DIAGRAM

V+

V+

IN+

IN-

MAX5048A
MAX5048B

GND

TEST CIRCUIT

P_OUT

N_OUT

t

D–ON

OUTPUT

C

L

t

R

MAX5048

7.6A, 12ns, SOT23 MOSFET Driver

8 _______________________________________________________________________________________

• 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

Figure 2. MAX5048A/MAX5048B Functional Diagram

Figure 3. Noninverting Application

Figure 4. Boost Converter

Figure 5. MAX5048A/MAX5048B in High-Power Synchronous
Buck Converter

MAX5048A
MAX5048B

IN-

IN+

BREAK-

BEFORE-

MAKE

CONTROL

P

N

V

S

V+

P_OUT

N_OUT

GND

V+

(4V TO 12.6V)

V+

IN+

IN-

4V TO 12V

IN+

P_OUT

MAX5048A
MAX5048B

N_OUT

GND

V+

P_OUT

V

S

P

MAX5048A/

MAX5048B

V+

(4V TO 12.6V)

V+

MAX5048A

FROM PWM

CONTROLLER

(BOOST)

MAX5048B

IN+

IN-

GND

P_OUT

N_OUT

V

OUT

FROM PWM

CONTROLLER

(BUCK)

IN-

IN+

IN-

N_OUT

GND

V+

P_OUT

MAX5048A
MAX5048B

N_OUT

GND

V

OUT

N

MAX5048

7.6A, 12ns, SOT23 MOSFET Driver

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

© 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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