PAM2322AGEAR

A Product Line of
Diodes Incorporated
PAM2322AGEAR
Dual High-Efficiency PWM Step-Down DC-DC Converter
ADVANCED INFORMATION
Description
Pin Assignments
The PAM2322AGEAR is a dual step-down current-mode, DC-DC
converter. At heavy load, the constant-frequency PWM control
performs with excellent stability and transient response. To ensure
the longest battery life in portable applications, the PAM2322AGEAR
provides a power-saving Pulse-Skipping Modulation (PSM) mode to
reduce quiescent current under light load operation
The PAM2322AGEAR supports a range of input voltages from 2.7V to
5.5V, allowing the use of a single Li+/Li-polymer cell, multiple
Alkaline/NiMH cell, USB, and other standard power sources. Output 1
is a 1.8V fixed output. Output 2 is adjustable from 0.9V to VIN. Both
outputs employ an internal power switch and synchronous rectifier to
minimize external part count and realize high efficiency.
Output 1 delivers up to 1000mA output current while output 2 delivers
up to 2000mA. Each regulator has an independent enable pin.
Each output of the PAM2322AGEAR can be disabled when a logic
low is applied to the channel enable pin. During shutdown, the input is
disconnected from the output and the shutdown current is less than
0.1μA
W-FLGA2520-17
Other key features include under-voltage lockout, soft-start, hiccup
mode short circuit protection and thermal shutdown.
Features
Applications

Supply Voltage:2.7V to 5.5V

Portable Electronics
Output Current:

Personal Information Appliances

Wireless and DSL Modems

OUT1: 1000mA/Buck, 1.8V Fixed Output
OUT2: 2000mA/Buck

Switching Frequency:1.2MHz

Internal Synchronous Rectifier

Fast Transient Response

Fast Turn On and Turn Off

Internal Soft Start

Internal Compensation

100% Duty Cycle Operation

Power Good Indicator for OUT1

Under-Voltage Lockout

Hiccup Mode Short Circuit Protection

Thermal Shutdown

Small W-FLGA2520-17 Package


Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
PAM2322AGEAR
Document Number: DS36234 Rev. 2 - 2
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A Product Line of
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PAM2322AGEAR
Typical Applications Circuit
L1
1.5µH
ADVANCED INFORMATION
VIN
3.3V
CIN
10uF
VOUT1
1.8V
SW1
VIN
COUT1
10uF
OUT1
CIN
10uF
PG1
EN1
PG1
EN1
PAM2322
EN2
EN2
L2
1.0µH
VOUT2
1.22V
SW2
COUT2
10uF
OUT2
GND
COUT2
10uF
Rfb_up
205kΩ
FB2
Rfb_dn
200kΩ
Pin Descriptions
Function
W-FLGA2520-17
Name
1, 15
SW2
Switch PIN for Output 2, PIN 1 and 15 can be connected on the PCB
2, 9, 16, 17
GND
Ground pin, PIN 2, 9, 16, 17 can be connected on the PCB
3
OUT2
Output sense pin of Output 2
4
FB2
Feedback pin for Output 2, the reference is set internally to 0.6V
5
EN2
Enable for Output 2. Pull high to enable channel 2. Pull low to disable
6
PG1
Output 1 power good indicator pin, open drain output
7
EN1
Enable for Output 1. Pull high to enable channel 1. Pull low to disable
8
OUT1
Output pin of Output 1, Channel one is internally fixed to 1.8V
10
SW1
Switch Pin for Output 1
11, 12, 13, 14
VIN
Input voltage pin. PIN 11, 12, 13, 14 can be connected on the PCB
PAM2322AGEAR
Document Number: DS36234 Rev. 2 - 2
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PAM2322AGEAR
ADVANCED INFORMATION
Functional Block Diagram
PAM2322AGEAR
Document Number: DS36234 Rev. 2 - 2
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PAM2322AGEAR
ADVANCED INFORMATION
Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.)
Parameter
Input Voltage
EN1, EN2, FB2
SW1 and SW2
Junction Temperature
Storage Temperature Range
Soldering Temperature
ESD Susceptibility (Note 5)
Human Body Model (HBM)
Machine Model (MM)
(Note 4)
Rating
-0.3 to +6.0
Unit
V
-0.3 to VIN
V
-0.3 to (VIN +0.3)
150
-65 to +150
260,10sec
°C
°C
°C
1.5
150
kV
V
V
Notes: 4. Stresses greater than the 'Absolute Maximum Ratings' specified above may cause permanent damage to the device. These are stress ratings only;
functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may
be affected by exposure to absolute maximum rating conditions for extended periods of time.
5. Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when
handling and transporting these devices.
Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.)
Parameter
Supply Voltage
Ambient Temperature Range
Junction Temperature Range
Rating
2.7 to 5.5
-40 to +85
-40 to +125
Unit
V
°C
Thermal Information
Parameter
Package
Symbol
Maximum
Thermal Resistance (Junction to Case)
W-FLGA2520-17
JC
16
Thermal Resistance (Junction to Ambient)
W-FLGA2520-17
JA
80
PAM2322AGEAR
Document Number: DS36234 Rev. 2 - 2
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Unit
°C/W
September 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
PAM2322AGEAR
Electrical Characteristics
ADVANCED INFORMATION
PARAMETER
Input Voltage Range
(TA= +25°C, VIN=3.3V, OUT1=1.8V, L1=1.5µH, OUT2=1.2V, L2=1.0µH, unless otherwise noted.)
SYMBOL
Test Conditions
MIN
TYP
MAX
UNITS
VIN

2.7
3.3
5.5
V
2.35
2.5
2.65
V

400

mV
-4

+4
%
0.591
0.60
0.609
V
-2.7

2.7
%
Output 1

1.5

A
Output 2

3

A
UVLO Threshold
VUVLO
Output1 Voltage Accuracy
OUT1
OUT2 Feedback Voltage
VFB2
Output2 Voltage Accuracy
Current Limit
OUT2
ILIM
VIN Rising
Hysteresis

No Load
VIN 3.0 to 3.6V, TA 0-70°C, VFB
resistors 0.25%
Quiescent Current
IQ
No load

60
100
µA
Shutdown Current
ISD
VEN = 0V


0.1
µA
SW Leakage Current
ILSW
VEN = 0V
Oscillator Frequency
fOSC
Drain-Source On-State Resistance


1
µA
1.0
1.2
1.4
MHz
IDS=100mA
Output 1
P MOSFET

120

mΩ
N MOSFET

80

mΩ
IDS=100mA
Output 2
P MOSFET

50

mΩ
N MOSFET

40

mΩ
VIN = 0 to 3.3V,Io=200mA


1000
µs
EN = 0 to 3.3V, Io=200mA


300
µs
EN = 3.3 to 0V, Io=5mA


7000
µs
EN = 0 to 3.3V, Io=200mA Vo=1.1V
to 1.2V
EN = 3.3 to 0V, Io=5mA Vo=1.2V to
1.1V


300
µs


450
µs
OUT1, SW1
EN1 transitions high to low


10
OUT2, SW2,
FB2
EN2 transitions high to low


10
RDS(ON)
Turn-on Time
Ts
Turn-off Time
Toff
Turn-on Pre-charge Time
Tchg
Turn-off Discharge Time
Tdis
High Impedance Delay

µs
EN1/EN2 Threshold High
VEH

1.2


V
EN1/EN2 Threshold Low
VEL



0.4
V
Over Temperature Protection
OTP


150

°C
OTP Hysteresis
OTH


30

°C
PG Pin Trigger Delay



90

us
PG Pin Threshold (Relative to Vout)



+/-10

%
PG Open Drain Impedance (PG=PVin)



500K

Ω
PG Open Drain Impedance (PG=low)




100
Ω
PAM2322AGEAR
Document Number: DS36234 Rev. 2 - 2
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PAM2322AGEAR
Electrical Characteristics (T = +25°C, VIN=3.3V, OUT1=1.8V, L1=1.5µH, OUT2=1.2V,L2=1.0µH, unless otherwise noted.) (cont.)
A
ADVANCED INFORMATION
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
OUT1

100

mA
OUT2

200

mA
OUT1

6

mA
OUT2

20

mA
IOUT1= 300uA to 600uA

55

%
IOUT1= 10mA

82

%
IOUT1= 300mA to 400mA

92

%
IOUT2= 200uA to 300uA

50

%
IOUT2= 10mA

80

%
IOUT2= 900mA to 1200mA

90

%
VLDR-OUT1
IOUT1= 100mA to 500mA

0.05%

VO/mA
VLDR-OUT2
IOUT2= 200mA to 1500mA

0.05%

VO/mA
VLNR-OUT1
VIN= 3.0V to 3.6V

0.1%

VO/V
VLNR-OUT2
VIN= 3.0V to 3.6V

0.1%

VO/V
PSM Threshold
Test Conditions
ITH
PSM Hysteresis
IHY
EffiOUT1
Efficiency
EffiOUT2
Load Regulation
Line Regulation
Application Information
The typical application circuit of PAM2322AGEAR is shown on page 2. External component selection is determined by the load requirement,
selecting inductors L1 and L2 first and then input capacitor CIN and output capacitor COUT.
Inductor selection
For most applications, the value of the inductor is in the range of 1μH to 3.3μH, which is chosen based on the desired current ripple. Large value
inductor brings lower current ripple and small value inductor results in higher current ripple. Higher VIN and VOUT increase the current ripple as well
shown in the following equation. For OUT1 with 1A loading current requirement, the reasonable current ripple starting point f is ΔIL = 0.4A (40% of
1A), For OUT2 with 2A loading current requirement, the reasonable current ripple starting point is ΔIL = 0.8A (40% of 2A)
I L 
1
 Vout 
Vout 1 

( f )( L)
Vin 

The DC current rating of the inductor should be at least equal to the maximum load current plus half of the current ripple to prevent core saturation.
A low DC-resistance inductor is better to get higher efficiency.
CIN and COUT selection
To prevent input large voltage transient, a low ESR capacitor with the maximum RMS current must be used. The maximum capacitor RMS current
is given by:
VOUT VIN  VOUT  2
1
C IN requiredI RMS  I OMAX
VIN
This formula shows that IRMS has the maximum value at VIN =2VOUT, where IRMS = IOUT/2 and this worst-case is common used for design.
PAM2322AGEAR
Document Number: DS36234 Rev. 2 - 2
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PAM2322AGEAR
Application Information (cont.)
CIN and COUT selection (cont.)
ADVANCED INFORMATION
The selection of Cout is driven by the requirement of effective series resistance (ESR) and the output voltage ripple ΔVOUT is determined by:

VOUT  I L ESR  1 fCOUT
8

Where f is the operating frequency, COUT is output capacitance and ΔIL is rippling current flowing through the inductor.
When output voltage is set, the output voltage ripple changes with the input voltage and is at its worst when input voltage reaches a high level.
Using Ceramic Input and Output Capacitors
Higher values, lower cost ceramic capacitors are now becoming available in smaller case sizes. Their high ripple current, high voltage rating and
low ESR make them ideal for switching regulator applications. Using ceramic capacitors can achieve very low output ripple and small PCB size.
X5R or X7R are preferred, because they have the better temperature and voltage characteristics.
Output Voltage Setting
PAM2322AGEAR output1 is fixed at 1.8V and cannot be adjusted. For other voltage options contact your Diodes representative.
Output2 can be adjusted based on an external connected voltage divider. The internal reference of FB2 is 0.6V (Typical). The output voltage can
be found based on the following calculation. The general output voltage is given in Table 1.


R
VOUT2  0.6  1  FB_UP 
 R

FB_LOW 

Table 1: Resistor Selection for Output 2 Voltage Setting
VOUT2
Rfb_up
Rfb_low
1.22V
1.5V
1.8V
2.5V
3.3V
205k
150k
300k
380k
680k
200k
100k
150k
120k
150k
Pulse Skipping Mode (PSM) Description
When load current decreases, the peak switch current from Power-PMOS is lower than skipping current threshold and the device will enter Pulse
Skipping Mode. In this mode, the device has two states, working state and idle state. Firstly, the device enters working state controlled by internal
error amplifier. When the feedback voltage gets higher than internal reference voltage, the device will enter idle state with internal blocks disabled.
When the feedback voltage gets lower than the internal reference voltage, the convertor will enter the working state again.
UVLO and Soft-Start
The reference and the circuit remain reset until the VIN crosses its UVLO threshold. The PAM2322AGEAR has an internal soft-start circuit that
limits the in-rush current during start-up. This prevents possible voltage drops of the input voltage and eliminates an output voltage overshoot.
PAM2322AGEAR
Document Number: DS36234 Rev. 2 - 2
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PAM2322AGEAR
Application Information (cont.)
ADVANCED INFORMATION
Hiccup Mode Short Circuit Control
When the converter output1 or output2 is shorted, or the device is overloaded during high-side MOSFET current-limit triggering, it will turn off the
high-side MOSFET and turn on the low-side MOSFET. An internal counter is used to count the number of the current-limit triggering. The counter
is reset when consecutive high-side MOSFET turn on without reaching current limit. If the current-limit condition persists, the counter fills up. The
control logic then stops both high side and low side MOSFETs and waits for a hiccup period, before attempting a new soft-start sequence. The
counter bit is decided by VFB voltage. If VFB≤0.2V, it is 3-bit counter; If VFB >0.2V it is 6-bit counter. The typical hiccup mode duty cycle is 1.7%.
The hiccup mode is disabled during soft-start time.
Over Temperature Protection
The internal thermal temperature protection circuitry is provided to protect the integrated circuit in the event that the maximum junction
temperature is exceeded. When the junction temperature exceeds +150°C, it shuts down the internal control circuit and switching power MOSFET.
The PAM2322AGEAR will restart automatically under the control of soft-start circuit when the junction temperature decreases to +120°C.
Power Good Flag
PG1 pin is power good indicator. The output of this pin is an open drain with internal pull up resistor to VIN. PG is pulled up to VIN when the
output1 voltage (1.8V) is within 10% of the regulation level, otherwise it is low.
PAM2322AGEAR
Document Number: DS36234 Rev. 2 - 2
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Typical Performance Characteristics (TA= +25°C, VIN=3.3V, OUT1=1.8V, L=1.5µH, OUT2=1.2V,L=1.0µH, unless otherwise noted.)
100
90
90
80
80
70
70
Efficiency (%)
Efficiency (%)
OUT2 Efficiency vs. Output Current
100
60
50
40
Vin=3.3V
Vin=4.2V
(Vin=5V)
Vout1=1.8V
30
20
10
60
50
40
Vin=3.3V
Vin=4.2V
Vin=5V
Vout2=1.2V
30
20
10
0
0
1
10
100
10
1000
100
1000
Output Current (mA)
Output Current (mA)
OUT1 Output Voltage vs. Output Current
OUT2 Output Voltage vs. Output Current
1.210
1.816
1.208
1.814
1.206
1.812
1.204
1.810
Output Voltage (V)
Output Voltage (V)
ADVANCED INFORMATION
OUT1 Efficiency vs. Output Current
1.808
1.806
1.804
1.802
Vin=3.3V
Vin=4.2V
Vin=5V
Vout1=1.8V
1.800
1.798
1.796
1.202
1.200
1.198
1.196
1.194
1.192
1.190
Vin=3.3V
Vin=4.2V
Vin=5V
Vout2=1.2V
1.188
1.186
1.794
1.184
1.792
1.182
1.180
1.790
0
100
200
300
400
500
600
700
800
900
1000
OUT1 Line Regulation vs. Input Voltage
PAM2322AGEAR
Document Number: DS36234 Rev. 2 - 2
0
200
400
600
800
1000
1200
1400
1600
1800
2000
Output Current (mA)
Output Current (mA)
OUT2 Line Regulation vs. Input Voltage
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Typical Performance Characteristics (TA= +25°C, VIN=3.3V, OUT1=1.8V, L=1.5µH, OUT2=1.2V,L=1.0µH, unless otherwise noted.)
1.0
Line Regulation (%V)
0.8
0.8
Line Regulation (%V)
0.6
0.4
0.2
0.0
-0.2
Io=100mA
Io=500mA
Io=1000mA
Vout1=1.8V
-0.4
-0.6
0.6
0.4
0.2
0.0
-0.2
Io=100mA
Io=1000mA
Io=1500mA
Vout2=1.2V
-0.4
-0.6
-0.8
-0.8
-1.0
2.5
3.0
3.5
4.0
4.5
-1.0
2.5
5.0
3.0
3.5
Input Voltage (V)
75
Vin=2.7V
Vin=3.5V
Vin=4.2V
Vout1=1.8V
Vout2=1.2V;
Io1=Io2=0A
70
65
95
85
80
75
70
55
65
-20
0
20
40
60
80
100
120
Vout1=1.8V
Vout2=1.2V
Io1=Io2=0A
90
60
50
-40
5.0
100
Dynamic Supply Current (uA)
Dynamic Supply Current (uA)
80
4.5
Dynamic Supply Current vs. Input Current
90
85
4.0
Input Voltage (V)
Dynamic Supply Current vs. Temperature
60
2.5
140
3.0
3.5
Temperature (oC)
4.0
4.5
5.0
5.5
Input Votage (V)
PMOS Rdson vs. Temperature
NMOS Rdson vs. Temperature
100
140
120
95
CH1 PMOS
CH2 PMOS
VIN=3.3V
90
NMOS Rdson (mohm)
130
PMOS Rdson(mohm)
ADVANCED INFORMATION
1.0
110
100
90
80
70
85
80
CH1 NMOS
CH2 NMOS
VIN=3.3V
75
70
65
60
55
50
60
45
50
40
40
30
-40
35
-20
0
20
40
60
80
100
120
140
30
-40
PAM2322AGEAR
Document Number: DS36234 Rev. 2 - 2
-20
0
20
40
60
80
100
120
140
Temperature (oC)
Temperture(oC)
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PAM2322AGEAR
Typical Performance Characteristics (TA= +25°C, VIN=3.3V, OUT1=1.8V, L=1.5µH, OUT2=1.2V,L=1.0µH, unless otherwise noted.)
ADVANCED INFORMATION
Enable turn on
Vin=3.3V, Vout1=1.8V, Vout2=1.2V, Io1=1A, Io2=2A
Enable turn off
Vin=3.3V, Vout1=1.8V, Vout2=1.2V, Io1=1A, Io2=2A
(CH1=Enable; CH2=Vout2; CH3=Vout1; CH4=PG)
(CH1=Enable; CH2=Vout2; CH3=Vout1; CH4=PG)
Output Ripple
Output Ripple
Vin=3.3V, Vout2=1.2V, Io2=0A
Vin=3.3V, Vout2=1.2V, Io2=1A
(CH1=Switch; CH3=Output Voltage; CH4=Inductor current)
(CH1=Switch; CH3=Output Voltage; CH4=Inductor current)
Output Short Protection
Output Short Recovery
Vin=3.3V, Vout2=1.2V, Io2=1A
Vin=3.3V, Vout2=1.2V, Io2=1A
(CH3=Output Voltage; CH4=Inductor Current)
(CH3=Output Voltage; CH4=Inductor Current)
PAM2322AGEAR
Document Number: DS36234 Rev. 2 - 2
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Ordering Information
ADVANCED INFORMATION
PAM2322AGEAR
Package
Packing
W-FLGA2520-17
7 Inch Tape & Reel
Part Number
Marking
Package Type
Standard Package
PAM2322AGEAR
CRA
XYW
W-FLGA2520-17
3,000 Units/Tape & Reel
Marking Information
Package Outline Dimensions (All dimensions in mm.)
W-FLGA2520-17
A3
A1
Seating Plane
A
e
E
Pin #1 ID
Pin #1 ID
L
D
La
W-FLGA2520-17
Dim
Min
Max
A
0.700 0.800
A1
0
0.050
A3
0.0203REF
b
0.200 0.300
D
2.420 2.580
E
1.950 2.050
e
0.500TYP
L
0.320 0.480
La
0.424 0.576
All Dimensions in mm
b
PAM2322AGEAR
Document Number: DS36234 Rev. 2 - 2
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Recommended Pad Layout
W-FLGA2520-17
X3
ADVANCED INFORMATION
X2
Dimensions
Y2 Y3
X1(9x)
Y1(9x)
Y(8x)
X(8x)
C
X
X1
X2
X3
Y
Y1
Y2
Y3
Value
(in mm)
0.500
0.350
0.600
1.850
2.320
0.600
0.350
1.350
2.800
C
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written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the
labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the
failure of the life support device or to affect its safety or effectiveness.
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use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related
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Copyright © 2014, Diodes Incorporated
www.diodes.com
PAM2322AGEAR
Document Number: DS36234 Rev. 2 - 2
13 of 13
www.diodes.com
September 2014
© Diodes Incorporated