MAXIM MAX5007BEUB

19-2035; Rev 0; 5/01
150mA USB LDO Regulators with ±15kV TVS
and µP Reset
Features
♦ Integrated ±15kV Transient Voltage Suppressors
for D+ and D- Data Lines
The MAX5005/MAX5006/MAX5007 include an internal
reset circuit that enables the USB microcontroller
100ms after the LDO regulator output voltage reaches
regulation. Reset outputs are available in push-pull
(active-low or active-high) and open-drain (active-low)
options.
The MAX5005/MAX5006/MAX5007 are optimized for
use with a 1µF ceramic output capacitor. Each device
includes thermal shutdown protection, output short-circuit protection, and output to input reverse leakage protection. These devices also include an active-low
manual reset input.
The MAX5005 features an open-drain reset output, the
MAX5006 features an active-low push-pull reset output,
and the MAX5007 features an active-high push-pull
reset output. Each device is available in a space-saving
10-pin µMAX package.
♦ 25µA Quiescent Current at Full Load
Applications
USB Peripherals
♦ Pin Selectable Internal D+ and D- Termination
Resistors (1.5kΩ ±5%)
♦ Integrated Microprocessor Reset Circuit with
100ms (min) Timeout
♦ 3.3V Output with ±3% Accuracy
♦ Small 1µF Output Capacitor
♦ Output to Input Reverse Leakage Protection
♦ Thermal and Short-Circuit Protection
♦ 10-Pin µMAX Package
Ordering Information
TEMP.
RANGE
PART
MAX5005_EUB*
-40°C to +85°C
10 µMAX
OpenDrain Low
MAX5006_EUB*
-40°C to +85°C
10 µMAX
Push-Pull
Low
MAX5007_EUB*
-40°C to +85°C
10 µMAX
Push-Pull
High
Pin Configuration
Typical Operating Circuit
3.3V USB
CONTROLLER
USB
PORT
VBUS
CIN
D-
RESET
OUTPUT
*Insert “A” for a 7.5% reset threshold and “B” for a 12.5% reset
threshold.
Hand-Held Instruments
D+
PINPACKAGE
SELR
ENR
5V IN
3.3V
OUT
1µF
COUT
CERAMIC
1µF
MAX5005
MAX5006
MAX5007
D+
RESET
(RESET)
D-
GND
MR
GND
GND
VCC
TOP VIEW
IN 1
RST
D+
10 OUT
2
D+
GND
3
D-
D-
4
SELR
5
MAX5005
MAX5006
MAX5007
GND
8
MR
7
RESET/(RESET)
6
ENR
µMAX
27Ω
27Ω
9
() FOR MAX5007 ONLY.
( ) FOR MAX5007 ONLY
________________________________________________________________ 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.
1
MAX5005/MAX5006/MAX5007
General Description
The MAX5005/MAX5006/MAX5007 are low-dropout
(LDO), micropower linear voltage regulators with an
integrated microprocessor (µP) reset circuit for use with
USB peripheral devices. Each device is available with a
fixed +3.3V output voltage and can deliver up to
150mA load current. Each device features ±15kV transient voltage suppression (TVS) as well as precision
1.5kΩ data-line termination resistors for USB digital signals making them ideal for use with USB peripherals.
MAX5005/MAX5006/MAX5007
150mA USB LDO Regulators with ±15kV TVS
and µP Reset
ABSOLUTE MAXIMUM RATINGS
IN to GND .................................................................-0.3V to +6V
D+, D- to GND..........................................................-0.3V to +6V
MR to GND ..............................................-0.3V to (VOUT + 0.3V)
RESET, RESET to GND, Push-Pull............-0.3V to (VOUT + 0.3V)
RESET to GND, Open-Drain.....................................-0.3V to +6V
OUT, SELR, ENR to GND .........................................-0.3V to +6V
Maximum Current to Any Pin
(except IN, OUT, D+, D-).............................................± 20mA
Short-Circuit Duration ....................................................Indefinite
Continuous Power Dissipation (TA = +70°C)
10-Pin µMAX (derate 5.6mW/°C above +70°C) ...........444mW
Thermal Resistance (θJA)...............................................180°C/W
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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
(VIN = +5V, IOUT = 0, COUT = 2.2µF, TA = -40°C to +85°C, unless otherwise noted. Typical specifications are at TA = +25°C.) (Note 1)
PARAMETER
Input Voltage Range
Supply Current
SYMBOL
VIN
IGND
CONDITIONS
ILOAD = 100mA
MIN
TYP
4.0
MAX
UNITS
5.5
V
25
50
µA
3.3
3.4
ILOAD = 10mA
20
30
ILOAD = 150mA
300
400
Measured at GND
REGULATOR
Guaranteed Output Current
IOUT
Output Voltage
VOUT
Dropout Voltage (Note 2)
∆VDO
150
VIN = 4.0V to 5.5V, IOUT = 0 to 100mA
Output Current Limit
VIN = 5.5V
Input Reverse Leakage Current
VIN = 0, VOUT = 5.5V
Startup Response Time
Rising edge of VIN to VOUT
RL = 500Ω
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
3.2
165
mA
V
mV
350
mA
1
µA
500
µs
TJSHDN
160
o
C
∆ TJSHDN
20
o
C
RESET CIRCUIT
Reset Threshold
(Note 3)
VTH
Reset Timeout Period
tRP
VOUT to Reset Delay
tRD
MAX500_AEUB
2.92
3.05
3.18
MAX500_BEUB
2.75
2.89
3.01
100
200
300
0.2 x
VOUT
VIL
0.8 x
VOUT
VIH
MR Minimum Input Pulse Width
120
MR to Reset Delay
10
VIL
Connects RTERM to D-
VIH
Connects RTERM to D+
25
ns
45
0.2 x
VOUT
SELR Input Voltage
2
ns
500
MR Pullup Resistance to OUT
V
µs
1
MR Glitch Rejection
ms
µs
75
MR Input Voltage
V
0.8 x
VOUT
_______________________________________________________________________________________
kΩ
V
150mA USB LDO Regulators with ±15kV TVS
and µP Reset
(VIN = +5V, IOUT = 0, COUT = 2.2µF, TA = -40°C to +85°C, unless otherwise noted. Typical specifications are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
SELR Input Current
CONDITIONS
SELR = GND or OUT
VIL
RTERM enabled
VIH
RTERM disabled
MIN
TYP
-1
VOL
Open-Drain Reset Output Leakage
Current (MAX5005)
ILKG
Push-Pull RESET Output Voltage
(MAX5006)
Push-Pull RESET Output Voltage
(MAX5007)
VOL
1
µA
V
0.8 x
VOUT
ENR = GND or OUT
Open-Drain RESET Output Low
Voltage (MAX5005)
UNITS
0.2 x
VOUT
ENR Input Voltage
ENR Input Current
MAX
-1
1
VOUT > 1.0V, ISINK = 50µA, reset asserted
0.3
VOUT > 2.7V, ISINK = 3.2mA, reset asserted
0.4
Reset not asserted
-1.0
1.0
VOUT = 1.0V, ISINK = 50µA, reset asserted
0.3
VOUT > VTH(MIN), ISINK = 3.2mA, reset
asserted
0.4
VOH
VOUT > VTH(MAX), ISOURCE = 500µA,
reset not asserted
VOL
VOUT > VTH(MAX), ISINK = 3.2mA,
reset not asserted
VOH
VOUT = 1.0V, ISOURCE = 150µA, reset
asserted
µA
V
µA
V
0.8 x
VOUT
0.4
V
0.8 x
VOUT
USB OPTIONS AND TRANSIENT SUPPRESSION
D+/D- RTERM Impedance
ENR = GND, SELR = GND or OUT
D+/D- Input Leakage Current
VENR = VOUT = 3.3V
D+ to D- Capacitance
1MHz, 100mVp-p signal
applied at D+ and D-,
VOUT = 3.3V
D+, D- Capacitance to GND
1MHz, 100mVp-p signal
applied at D+ and D-,
VOUT = 3.3V
1425
1500
-1
ENR = OUT
5.5
Unpowered
24
ENR = OUT
40
Unpowered
47
1575
Ω
1
µA
pF
pF
ESD Trigger Voltage
dV/dt < 1V/ns, VD+ or VD- > 3.6V
3.6
5
V
Surge Trigger Voltage
dV/dt < 2V/µs, VD+ or VD- > 3.6V
3.6
16
V
Clamping Voltage
6A, pulse width = 200ns to 40µs
16
V
Surge Current
16V, pulse width = 200ns to 40µs
±6
A
Human Body Model MIL-STD-883
±16
Contact Discharge IEC1000-4-2
(EN61000-4-2)
±8
Air Discharge IEC1000-4-2 (EN61000-4-2)
±15
D+/D- to GND ESD
kV
Note 1: All devices are 100% tested at TA = +25°C. Limits over temperature are guaranteed by characterization and not production
tested.
Note 2: Dropout voltage is defined as VIN - VOUT when VOUT is 2% below the value of VOUT for VIN = VOUT + 1V.
Note 3: Specification is guaranteed to ±4σ limit.
_______________________________________________________________________________________
3
MAX5005/MAX5006/MAX5007
ELECTRICAL CHARACTERISTICS (continued)
Typical Operating Characteristics
(VIN = +5V, IOUT = 0, COUT = 2.2µF, unless otherwise noted.)
GROUND-PIN CURRENT
vs. SUPPLY VOLTAGE
MAXIMUM PULSE DURATION vs.
RESET THRESHOLD OVERDRIVE
24.0
23.5
150
RESET OCCURS ABOVE THIS LINE
100
50
23.0
IOUT = 0
22.5
0
22.0
3.5
4.0
4.5
5.0
1
5.5
10
MAX5005-7 toc03
100
0
15 30 45 60 75 90 105 120 135 150
RESET THRESHOLD OVERDRIVE, VTH - VOUT (mV)
SUPPLY VOLTAGE (V)
LOAD CURRENT (mA)
POWER-SUPPLY REJECTION RATIO vs.
FREQUENCY
OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE
3.35
MAX5005-07 toc04
0
-5
3.34
-20
-25
-30
-35
-40
-45
IOUT = 0
3.33
OUTPUT VOLTAGE (V)
-10
-15
PSRR (dB)
300
275
250
225
200
175
150
125
100
75
50
25
0
MAX5005-7 toc05
IOUT = 150mA
24.5
DROPOUT VOLTAGE (mV)
25.5
25.0
200
PULSE DURATION (µs)
26.0
MAX5005-7 toc02
26.5
DROPOUT VOLTAGE
vs. LOAD CURRENT
250
MAX5005-7 toc01
27.0
GROUND-PIN CURRENT (µA)
3.32
3.31
IOUT = 150mA
3.30
3.29
3.28
3.27
-50
-55
-60
3.26
COUT = 1µF
3.25
0.01
0.1
1
FREQUENCY (kHz)
10
3.5
4.0
4.5
5.0
5.5
SUPPLY VOLTAGE (V)
REGION OF STABLE COUT
ESR vs. LOAD CURRENT
OUTPUT NOISE
MAX5005-7 toc07
MAX5005-7 toc06
150
125
COUT ESR (Ω)
MAX5005/MAX5006/MAX5007
150mA USB LDO Regulators with ±15kV TVS
and µP Reset
100
COUT = 1µF
75
VOUT
1mV/div
COUT = 4.7µF
50
25
STABLE REGION BELOW THE CURVE
0
0
15 30 45 60 75 90 105 120 135 150
200µs/div
LOAD CURRENT (mA)
4
_______________________________________________________________________________________
150mA USB LDO Regulators with ±15kV TVS
and µP Reset
TURN-ON/TURN-OFF RESPONSE
LOAD TRANSIENT RESPONSE
STARTUP RESPONSE
MAX5005-7 toc08
MAX5005-7 toc10a
MAX5005-7 toc09
20mA
ILOAD
VIN
5V/div
VIN
5V/div
0
VOUT
50mV/div
VOUT
5V/div
3.3V
RESET
5V/div
COUT = 2.2µF
VOUT
50mV/div
VOUT
1V/div
3.3V
COUT = 1.0µF
RL = 1kΩ
RL = 1kΩ
50ms/div
1.0ms/div
1ms/div
LOAD TRANSIENT RESPONSE
LINE TRANSIENT RESPONSE
MAX5005-7 toc10b
MAX5005-7 toc11a
5.25V
VIN
200mV/div
ILOAD
20mA
0
VOUT
50mV/div
4.75V
3.3V
COUT = 10µF
VOUT
50mV/div
3.3V
VOUT
50mV/div
3.3V
COUT = 4.7µF
IOUT = 10mA
COUT = IµF
1.0ms/div
100µs/div
LINE TRANSIENT RESPONSE
TVS PEAK POWER vs. PULSE WIDTH
MAX5005-7 toc11b
MAX5005-7 toc12
1000
5.25V
PEAK POWER (W)
VIN
200mV/div
4.75V
3.3V
VOUT
50mV/div
100
10
IOUT = 10mA
COUT = 1µF
D+ OR D- WITH RESPECT TO GROUND
1
100µs/div
0.01
0.1
1
10
100
PULSE WIDTH (µs)
_______________________________________________________________________________________
5
MAX5005/MAX5006/MAX5007
Typical Operating Characteristics (continued)
(VIN = +5V, IOUT = 0, COUT = 2.2µF, unless otherwise noted.)
150mA USB LDO Regulators with ±15kV TVS
and µP Reset
MAX5005/MAX5006/MAX5007
Pin Description
PIN
NAME
DESCRIPTION
1
IN
Regulator Input. Supply voltage ranges from +4.0V to +5.5V. Bypass with a 1µF ceramic capacitor
to ground.
2
D+
D+ ESD/Transient Suppression Input. Connect directly to USB port D+ data input. SELR high and
ENR low connects D+ to OUT through a 1.5kΩ resistor.
3, 9
GND
Ground. This pin also functions as a heatsink. Solder to large pads or the circuit board ground
plane to maximize thermal dissipation.
4
D-
D- ESD/Transient Suppression Input. Connect directly to USB port D- data input. SELR low and
ENR low connects D- to OUT through a 1.5kΩ resistor.
5
SELR
USB Full-Speed/Low-Speed Termination Resistor Select. Logic high connects the termination
resistor to D+ for full-speed peripherals. Logic low connects the termination resistor to D- for lowspeed peripherals. An internal 1.5kΩ resistor connects to OUT when ENR is low.
6
ENR
USB Termination Resistor Enable. When reset is not asserted, ENR low enables the termination
resistor connection. ENR high or a reset disables the termination resistor connection.
RESET
Active-Low Reset Output. RESET remains low while VOUT is below the reset threshold or while MR
is held low. RESET remains low for the duration of the reset timeout period after the reset conditions
are terminated. (MAX5005/MAX5006 ONLY)
RESET
Active-High Reset Output. RESET remains high while VOUT is below the reset threshold or while MR
is held low. RESET remains high for the duration of the reset timeout period after the reset
conditions are terminated. (MAX5007 ONLY)
8
MR
Active-Low Manual Reset Input. A logic low forces a reset. Reset remains asserted for the duration
of the reset timeout period after MR transitions from low to high. Leave unconnected or connect to
OUT if not used. MR has an internal pullup resistor of 25kΩ to OUT.
10
OUT
Voltage Regulator Output. Fixed +3.3V. Sources up to 150mA. Bypass with a 1µF (min) capacitor
for full rated performance.
7
6
_______________________________________________________________________________________
150mA USB LDO Regulators with ±15kV TVS
and µP Reset
MAX5005/MAX5006/MAX5007
IN
4.0V to 5.5V
THERMAL
PROTECTION
REVERSE
CURRENT
PROTECTION
OUT
3.3V
CURRENT
LIMIT
PROTECTION
MAX5005
MAX5006
MAX5007
ESD/
SURGE
PROTECTION
LDO
ERROR
AMP
200ms
RESET
TIMEOUT
VREF
1.23V
RESET/(RESET)
RESET
COMPARATOR
GND
FULL
SPEED
25kΩ
USB
TERMINATION
DRIVER
LOW
SPEED
MR
OUT
OUT
1.5kΩ
1.5kΩ
TVS
TVS
D-
D+
SELR
ENR
GND
( ) FOR MAX5007 ONLY.
Figure 1. Functional Diagram
Detailed Description
The MAX5005/MAX5006/MAX5007 are USB application-specific, low-dropout, low-quiescent current linear
regulators with an integrated µP reset circuit (see
Figure 1). The devices drive loads up to 150mA and
are available with a fixed output voltage of +3.3V.
Features include 1.5kΩ D+ and D- termination resistors
and ±15kV transient voltage suppression (TVS) in
accordance with IEC1000-4-2 (EN61000-4-2) Air
Discharge Method and MILSTD883C- Method 3015-6
making the MAX5005/MAX5006/MAX5007 ideal for use
with USB peripheral devices. The internal reset circuit
monitors the regulator output voltage and asserts a
reset signal when the output is typically -7.5% out of
regulation for MAX500_AEUB and -12.5% out of regulation for MAX500_BEUB.
Reset Circuit
The reset supervisor circuit is fully integrated in the
MAX5005/MAX5006/MAX5007, and uses the same reference voltage as the regulator. Two supply tolerance
reset thresholds, typically -7.5% and -12.5%, are available for each type of device.
7.5% reset: Reset does not assert until the regulator
output voltage is at least -3.6% out of tolerance and
always asserts before the regulator output voltage is
-11.5% out of tolerance.
12.5% reset: Reset does not assert until the regulator
output voltage is at least -8.8% out of tolerance and
always asserts before the regulator output voltage is
-16.7% out of tolerance.
Reset Output
The MAX5005/MAX5006/MAX5007 µP supervisory circuits assert a reset during power-up, power-down, and
_______________________________________________________________________________________
7
MAX5005/MAX5006/MAX5007
150mA USB LDO Regulators with ±15kV TVS
and µP Reset
brownout conditions. Reset is guaranteed to be logic
high or low depending on the device chosen (see
Ordering Information). RESET or RESET asserts when
VOUT is below the reset threshold and remains asserted for at least 100ms minimum after VOUT rises above
the reset threshold. RESET or RESET also asserts when
MR is pulled low.
SELR and ENR
When reset is not asserted a logic high to SELR connects a 1.5kΩ termination resistor from D+ to OUT for
full speed USB peripherals and a logic low connects a
1.5kΩ termination resistor from D- to OUT for low-speed
peripherals. Logic low on ENR enables the selected
termination resistor connection and logic high disables
the selected termination resistor connection. An asserted reset always disconnects the termination resistors.
D+ and DD+ and D- include transient voltage suppressors rated
at ±15kV (see USB ±15kV Transient Voltage
Suppression section).
The proprietary TVS shunt circuit passes no data
through the MAX5005/MAX5006/MAX5007, thereby
eliminating delays associated with series protection circuits. D+ and D- have only 1µA of leakage current and
a typical input capacitance of 40pF at 1MHz.
Manual Reset Input
Many µP-based products require manual reset capability, allowing the operator, a test technician, or external
logic circuitry to initiate a reset. A logic low on MR
asserts a reset while the regulator output voltage is still
within tolerance.
can be powered from an auxiliary supply such as a
backup battery without any need for additional blocking
diodes.
Current Limit
The MAX5005/MAX5006/MAX5007 include a current
limiter that monitors and controls the pass transistor’s
gate voltage, limiting the output current to 350mA (typ).
For design purposes, consider the current limit to be
160mA (min) to 600mA (max). The output can be shorted to ground for an indefinite period without damaging
the part.
Thermal Protection
When the junction temperature exceeds TJ = +160°C,
an internal thermal sensor signals the shutdown logic,
turning off the pass transistor and allowing the IC to
cool. The thermal sensor turns the pass transistor on
again after the IC’s junction temperature decreases by
20°C, resulting in a pulsed output during continuous
thermal overload conditions. Thermal overload protection is designed to protect the MAX5005/MAX5006/
MAX5007 in the event of fault conditions. For continuous operation, do not exceed the absolute maximum
junction temperature rating of TJ = +150°C.
Operating Region and Power Dissipation
The MAX5005/MAX5006/MAX5007’s maximum power
dissipation depends on the thermal resistance of the
case and circuit board, the temperature difference
between the die junction and the ambient air, and the
rate of airflow. The power dissipation across the device
is P = IOUT (VIN - VOUT). The maximum power dissipation is:
Reset remains asserted while MR is low and for the
reset timeout period (100ms minimum) after MR returns
high. The MR input has an internal pullup of 25kΩ (typ)
to OUT. Drive this input with TTL/CMOS logic levels or
with open-drain/collector outputs. Connect a normally
open momentary switch from MR to GND to create a
manual reset function; external debounce circuitry is
not required. If MR is driven from long cables or the
device is used in a noisy environment, connect a 0.1µF
capacitor from MR to GND to provide additional noise
immunity. For proper operation, ensure that the voltage
on MR is not greater than a diode drop above VOUT.
PMAX = (TJ - TA) / (ΘJA)
where TJ - TA is the temperature difference between
the die junction and the surrounding air, ΘJA is the thermal resistance of the package from junction to ambient.
The MAX5005/MAX5006/MAX5007’s ground pin (GND)
performs the dual function of providing an electrical
connection to the system ground and channeling heat
away. Connect GND to the system ground using a
large pad or ground plane. For optimum performance,
minimize trace inductance to D+, D-, and GND.
Output to Input Reverse Leakage
Protection
Capacitor Selection and Regulator
Stability
An internal circuit monitors the input and output voltages. When the output voltage is greater than the input
voltage, the internal pass transistor and parasitic
diodes turn off, and OUT powers the device. There is
no leakage path from OUT to IN. Therefore, the output
For stable operation over the full temperature range
and with load currents up to 150mA, use a 1µF (min)
output capacitor. To reduce noise and improve load
transient response, stability, and power-supply rejection, use large output capacitor values such as 10µF.
8
Applications Information
_______________________________________________________________________________________
150mA USB LDO Regulators with ±15kV TVS
and µP Reset
Negative-Going VOUT Transients
These devices are relatively immune to short-duration,
negative-going VOUT transients. The Typical Operating
Characteristics section shows a graph of the Maximum
Pulse Duration vs. Reset Threshold Overdrive for which
reset is not asserted. The graph was produced using
negative going output transients starting at VOUT and
ending below the reset threshold by the magnitude
indicated (Reset Threshold Overdrive). The graph
shows the maximum pulse width that a negative going
VOUT transient can typically have without triggering a
reset pulse. As the amplitude of the transient increases
(i.e., goes further below the reset threshold), the maximum allowable pulse width decreases. Typically, a
VOUT transient that goes only 10mV below the reset
threshold and lasts for 75µs will not trigger a reset
pulse.
USB ±15kV Transient Voltage
Suppression
The universal serial bus (USB) simplifies interconnectivity between peripheral devices and personal computers. USBs offer high-speed data communication rates
(up to 12Mbps) using only two lines (D+ and D-).
CMOS based USB peripherals that utilize deep submicron technologies are more susceptible to electrostatic
discharge (ESD) failure due to shorter channel lengths,
shallower drain/source junctions, and lightly doped
drain structures. The MAX5005/MAX5006/MAX5007
incorporate a proprietary transient voltage suppression
(TVS) circuit for use with submicron devices.
The TVS design complies with IEC-1000-4-2 level 4
(EN61000-4-2) ±15kV Air Discharge and ±8kV Contact
Discharge as well as MIL STD 883C-Method 3015-6
level 3.
The TVS circuit handles up to 11A of surge current. The
TVS/ESD structure is directly coupled to the output of
the LDO regulator.
TVS Surge Test Information
Figure 2 shows the test circuit used to generate the
8/40µs short circuit waveform of Figure 3. Figures 4, 5,
and 6 show the actual surge current I/V characteristics
with various capacitive loads.
ESD Performance
The MAX5005/MAX5006/MAX5007 are characterized
to the following limits on D+, D-, and IN:
• ±15kV using the Human Body Model
• ±8kV using the Contact Discharge Method specified
in IEC 1000-4-2 (EN61000-4-2)
• ±15kV using the Air-Gap Discharge Method specified in IEC 1000-4-2 (EN61000-4-2).
Note that in order to achieve the above ESD levels on
IN, a ceramic 1µF ceramic capacitor should be connected from IN to GND.
ESD Test Conditions
ESD performance depends on several conditions.
Contact Maxim for a reliability report that documents
test setup, methodology, and results.
Human Body Model
Figure 7 shows the Human Body Model, and Figure 8
shows the current waveform it generates when discharged into low impedance. This model consists of a
100pF capacitor charged to the ESD voltage of interest,
which is then discharged into the test device through a
1.5kΩ resistor.
ESD Transmission Line Pulsing
Figure 9 shows the test circuit used for transmission
line pulsing conditions. The 200ns pulsewidth has a
rise time of 4ns. Figure 10 shows the Current vs.
Voltage characteristics for various output capacitance
values.
_______________________________________________________________________________________
9
MAX5005/MAX5006/MAX5007
Note that some ceramic dielectrics exhibit large capacitance and ESR variation with temperature. With
dielectrics such as Z5U and Y5V, it may be necessary
to use 2.2µF or more to ensure stability at temperatures
below -10°C. With X7R or X5R dielectrics, 1µF should
be sufficient at all operating temperatures. Also, for
high-ESR tantalum capacitors, 2.2µF or more may be
needed to maintain stability. A graph of the Region of
Stable C OUT ESR vs. Load Current is shown in the
Typical Operating Characteristics.
To improve power-supply rejection and transient
response use a 1µF capacitor between IN and GND.
IP 100%
JENNINGS
RELAY
RF3D-26S
200kΩ
80µH
20Ω
LEAKAGE
RELAY
0.2µF
HIGH
VOLTAGE
40µs
t2
AMPERES
50%
D+/D-
2µF
4kV
TVS
DEVICE
UNDER
TEST
Figure 2. Surge Current Test Circut
0
0
10
12
COUT = 0
D+ OR D- TO GND
10
8/40µs PULSE WIDTH
8
CURRENT (A)
CURRENT (A)
8
6
TIME
8µs
t1
Figure 3. Test Circuit Surge Current Waveform (Short-Circuit
Load)
12
8/40µs PULSE WIDTH
4
6
4
2
2
0
0
0
2
4
6
8 10 12 14 16 18 20
VOLTAGE (V)
Figure 4. Surge Current I/V Characteristic (COUT = 0)
COUT = 1µF
D+ OR D- TO GND
0
2
4
6
8
10 12 14 16 18
VOLTAGE (V)
Figure 5. Surge Current I/V Characteristic (COUT = 1µF)
12
10
8/40µs PULSE WIDTH
8
CURRENT (A)
MAX5005/MAX5006/MAX5007
150mA USB LDO Regulators with ±15kV TVS
and µP Reset
6
4
COUT = 10µF
D+ OR D- TO GND
2
0
0
2
4
6
8
10 12 14 16 18
VOLTAGE (V)
Figure 6. Surge Current I/V Characteristic (COUT = 10µF)
10
______________________________________________________________________________________
150mA USB LDO Regulators with ±15kV TVS
and µP Reset
CHARGE-CURRENT
LIMIT RESISTOR
IP 100%
90%
DISCHARGE
RESISTANCE
MAX5005/MAX5006/MAX5007
RD
1500Ω
RC
1MΩ
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
Ir
AMPERES
HIGHVOLTAGE
DC
SOURCE
Cs
100pF
DEVICE
UNDER
TEST
STORAGE
CAPACITOR
36.8%
10%
0
0
Figure 7. Human Body ESD Test Model
TIME
tRL
tDL
CURRENT WAVEFORM
Figure 8. Human Body Model Current Waveform
7
6
L
10MΩ
5
CURRENT (A)
Zo = 50Ω
SCOPE
VIN
DEVICE
4
D+ OR D- TO GND
COUT = 0
200ns PULSE WIDTH
3
2
1
RL
0
0
2
4
6
8
10
12
14
16
VOLTAGE (V)
Figure 10. Transmission Line Pulsing I/V Characteristic
(COUT = 0)
tRISE = 4ns
7
6
tpw = 200ns
CURRENT (A)
5
4
D+ OR D- TO GND
COUT = 1µF
200ns PULSE WIDTH
3
2
1
Figure 9. Transmission Line Pulsing Setup for ESD I/V
Characteristics
0
0
2
4
6
8
10
12
14
16
VOLTAGE (V)
Figure 11. Transmission Line Pulsing I/V Characteristic
(COUT = 1µF)
______________________________________________________________________________________
11
150mA USB LDO Regulators with ±15kV TVS
and µP Reset
MAX5005/MAX5006/MAX5007
Chip Information
7
6
CURRENT (A)
5
4
TRANSISTOR COUNT: 890
PROCESS: BiCMOS
D+ OR D- TO GND
COUT = 10µF
200ns PULSE WIDTH
3
2
1
0
0
2
4
6
8
10
12
14
16
VOLTAGE (V)
12
______________________________________________________________________________________