PAM2320 User Guide

PAM2320
EVB User Guide
PAM2320 PSOP8 EV Board User Guide
AE Department
1. Revision Information
Date
2010/05
2011/06
Revision
V1.1
V2.0
Description
Initial Release
Optimize EVB
Comment
PAM2310 EB09AA
PAM2320 EB16AA
2. PAM2320 General Description
The PAM2320 is a 3A step-down DC-DC converter. At heavy load, the constant-frequency PWM control
performs excellent stability and transient response. No external compensation components are required.
The PAM2320 supports a range of input voltages from 2.7V to 5.5V, allowing the use of adapter or DC-DC
output 5V etc standard power source. The output voltage is adjustable from 0.6V to the input voltage. The
PAM2320 employs internal power switch and synchronous rectifier to minimize external part count and
realize high efficiency. During shutdown, the input is disconnected from the output and the shutdown current
is less than 1μA. Other key features include over-temperature and short circuit protection.
The PAM2320 delivers 3A maximum output current while consuming only 42μA of no-load quiescent current.
Ultra-low RDS(ON) integrated MOSFETs and 100% duty cycle operation make the PAM2320 an ideal choice
for high output voltage, high current applications which require a low dropout threshold.
The PAM2320 is available in PSOP8 package.
This application note contains new product information. Diodes, Inc. reserves the right to modify the product specification without notice.
No liability isassumed as a result of the use of this product. No rights under any patent accompany the sale of the product.
PAM2320
EVB User Guide
3. Key Features
z
z
z
z
z
z
z
Output Current: Up to 3A
Output Voltage: 0.6V to VIN
Input Voltage: 2.7V to 5.5V
Efficiency up to 95%
42μA (Typ) No Load Quiescent Current
Shutdown Current: <1µA
100% Duty Cycle LDO Operation
z
z
z
z
z
z
1.5MHz Switching Frequency
Internal Soft Start
No external Compensation Required
Current Limit Protection
Thermal Shutdown
PSOP8 Package
4. EV Board Schematic
C1
C6
C7
IC1
C11
1
VIN
R1
FB
VOUT
L1
SW
2
3
4
NC
NC
VIN
EN
SW
NC
GND
FB
8
VIN
EN
7
3
2
1
6
5
FB
R2
C2
C8
C9
C10
5. EVB PAM2320 EB16AA Description
PAM2320 EB16AA is an evaluation board for the PAM2320 PSOP8, a DC/DC converter. The board is
targeted to be used in providing a simple and convenient evaluation environment for the PAM2320.
Requires parts, power supply connectors etc. on the board, which makes it easy to be evaluated.
This application note contains new product information. Diodes, Inc. reserves the right to modify the product specification without notice.
No liability isassumed as a result of the use of this product. No rights under any patent accompany the sale of the product.
PAM2320
EVB User Guide
6. EV Board View
Top View
7. Resistor Select for Output Voltage Setting
VOUT = (1+R1/R2)×VREF
Vo
1.2V
1.5V
1.8V
2.5V
3.3V
(VREF = 0.6V)
R1
150k
225k
300k
475k
680k
R2
150k
150k
150k
150k
150k
L
2.2µH
2.2µH
2.2µH
2.2µH
3.3µH
This application note contains new product information. Diodes, Inc. reserves the right to modify the product specification without notice.
No liability isassumed as a result of the use of this product. No rights under any patent accompany the sale of the product.
PAM2320
EVB User Guide
8. External Compnents Selection
Input & output Capacitors (C1,C6,C7; C2,C8,C9,C10)
(1) For lower output ripple, low ESR is required.
(2) Low leakage current needed, X5R/X7R ceramic recommend, multiple capacitor parallel connection.
Feed forward capacitor (C11)
(1) Lower the output ripple.
(2) Low leakage current needed, 100pF, COH/CH ceramic recommend.
Output Voltage programmer resistors (R1, R2)
(1) For programmer output voltage.
(2) For accurate output voltage, 1% tolerance is required.
Inductor (L1)
(1) Low DCR for good efficiency.
(2) Inductance saturate current must higher than the output current.
9. Evaluation Board BOM List
Item
Value
C1, C6, C7
10µF
C2, C8, C9, C10 10µF
C11
100pF
L1
3.3µH
R1
R2
IC1
PCB
680K
150K
Type
X5R/X7R,
Ceramic/1206
X5R/X7R,
Ceramic/0805
COH/CH,
Ceramic/0402
Rating
25V
10V
50V
>4A
0603
1%
0603
1%
PAM2320
PSOP-8
PAM2320 EB16AA
Description
Vender and Part No.
HR-TECH
Input coupling CAP,
TMK316 BJ106KL-T
AIYO YUDEN
Output CAP
EMK212ABJ106KD-T
TAIYO YUDEN
Feed forward CAP
UMK105CH101JV-F
WURTH 744777003
Inductor
TAIYO YUDEN
NRS8030T3R0NMGJ
Voltage set RES
This application note contains new product information. Diodes, Inc. reserves the right to modify the product specification without notice.
No liability isassumed as a result of the use of this product. No rights under any patent accompany the sale of the product.
PAM2320
EVB User Guide
10. PCB Layout Example
Top Layer
This application note contains new product information. Diodes, Inc. reserves the right to modify the product specification without notice.
No liability isassumed as a result of the use of this product. No rights under any patent accompany the sale of the product.
PAM2320
EVB User Guide
Bottom Layer
This application note contains new product information. Diodes, Inc. reserves the right to modify the product specification without notice.
No liability isassumed as a result of the use of this product. No rights under any patent accompany the sale of the product.