A Product Line of
Diodes Incorporated
PAM2322AGEAR
Dual High-Efficiency PWM Step-Down DC-DC Converter
Description
ADVANCED INFORMATION
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
Other key features include under-voltage lockout, soft-start, hiccup
mode short circuit protection and thermal shutdown.
Pin Assignments
W-FLGA2520-17
Features
Supply Voltage:2.7V to 5.5V
Output Current:
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)
Applications
Portable Electronics
Personal Information Appliances
Wireless and DSL Modems
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
1 of 13
www.diodes.com
September 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
PAM2322AGEAR
Typical Applications Circuit
L1
1.5µH
VIN
3.3V
VOUT1
1.8V
COUT1
10uF
SW1
VIN
CIN
10uF
ADVANCED INFORMATION
CIN
10uF
EN1
OUT1
PG1
EN1
EN2
PG1
PAM2322
EN2
SW2
GND
OUT2
Rfb_up
205kΩ
COUT2
10uF
COUT2
10uF
L2
1.0µH
VOUT2
1.22V
FB2
Rfb_dn
200kΩ
Pin Descriptions
W-FLGA2520-17
1, 15
2, 9, 16, 17
3
4
5
6
7
8
10
11, 12, 13, 14
Name
SW2
GND
OUT2
FB2
EN2
PG1
EN1
OUT1
SW1
VIN
Function
Switch PIN for Output 2, PIN 1 and 15 can be connected on the PCB
Ground pin, PIN 2, 9, 16, 17 can be connected on the PCB
Output sense pin of Output 2
Feedback pin for Output 2, the reference is set internally to 0.6V
Enable for Output 2. Pull high to enable channel 2. Pull low to disable
Output 1 power good indicator pin, open drain output
Enable for Output 1. Pull high to enable channel 1. Pull low to disable
Output pin of Output 1, Channel one is internally fixed to 1.8V
Switch Pin for Output 1
Input voltage pin. PIN 11, 12, 13, 14 can be connected on the PCB
PAM2322AGEAR
Document Number: DS36234 Rev. 2 - 2
2 of 13
www.diodes.com
September 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
PAM2322AGEAR
Functional Block Diagram
ADVANCED INFORMATION
PAM2322AGEAR
Document Number: DS36234 Rev. 2 - 2
3 of 13
www.diodes.com
September 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
PAM2322AGEAR
Absolute Maximum Ratings
(@T
A
= +25°C, unless otherwise specified.)
Parameter
Rating
-0.3 to +6.0
-0.3 to V
IN
-0.3 to (V
IN
+0.3)
150
-65 to +150
260,10sec
1.5
150
(Note 4)
ADVANCED INFORMATION
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)
Unit
V
V
V
°C
°C
°C
kV
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
(@T
A
= +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
Thermal Resistance (Junction to Case)
Thermal Resistance (Junction to Ambient)
Package
W-FLGA2520-17
W-FLGA2520-17
Symbol
JC
JA
Maximum
16
Unit
°C/W
80
PAM2322AGEAR
Document Number: DS36234 Rev. 2 - 2
4 of 13
www.diodes.com
September 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
PAM2322AGEAR
Electrical Characteristics
(T
A
= +25°C, VIN=3.3V, OUT1=1.8V, L1=1.5µH, OUT2=1.2V, L2=1.0µH, unless otherwise noted.)
PARAMETER
SYMBOL
V
IN
Test Conditions
V
IN
Rising
Hysteresis
No Load
VIN 3.0 to 3.6V, TA 0-70°C, VFB
resistors 0.25%
Output 1
Output 2
No load
V
EN
= 0V
V
EN
= 0V
I
DS
=100mA
Output 1
P MOSFET
N MOSFET
P MOSFET
N MOSFET
MIN
2.7
2.35
-4
0.591
-2.7
1.0
1.2
TYP
3.3
2.5
400
0.60
1.5
3
60
1.2
120
80
50
40
150
30
90
+/-10
500K
MAX
5.5
2.65
+4
0.609
2.7
100
0.1
1
1.4
1000
300
7000
300
450
10
UNITS
V
V
mV
%
V
%
A
A
µA
µA
µA
MHz
mΩ
mΩ
mΩ
mΩ
µs
µs
µs
µs
µs
µs
ADVANCED INFORMATION
Input Voltage Range
UVLO Threshold
Output1 Voltage Accuracy
OUT2 Feedback Voltage
Output2 Voltage Accuracy
Current Limit
Quiescent Current
Shutdown Current
SW Leakage Current
Oscillator Frequency
V
UVLO
OUT1
V
FB2
OUT2
I
LIM
I
Q
I
SD
I
LSW
f
OSC
Drain-Source On-State Resistance
R
DS(ON)
I
DS
=100mA
Output 2
VIN = 0 to 3.3V,Io=200mA
Turn-on Time
Turn-off Time
Turn-on Pre-charge Time
Turn-off Discharge Time
High Impedance Delay
Ts
EN = 0 to 3.3V, Io=200mA
Toff
Tchg
Tdis
OUT1, SW1
OUT2, SW2,
FB2
EN1/EN2 Threshold High
EN1/EN2 Threshold Low
Over Temperature Protection
OTP
Hysteresis
PG Pin Trigger Delay
PG Pin Threshold (Relative to Vout)
PG Open Drain Impedance (PG=PVin)
PG Open Drain Impedance (PG=low)
V
EH
V
EL
OTP
OTH
EN = 3.3 to 0V, Io=5mA
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
EN1 transitions high to low
EN2 transitions high to low
10
0.4
100
V
V
°C
°C
us
%
Ω
Ω
PAM2322AGEAR
Document Number: DS36234 Rev. 2 - 2
5 of 13
www.diodes.com
September 2014
© Diodes Incorporated
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