PAM2316 User Guide

PAM2316
EVB User Guide
PAM2316 TDFN EV Board User Guide
AE Department
1. Revision Information
Date
2011/08
Revision
V1.0
Description
Initial Release
Comment
2. PAM2316 General Description
The PAM2316 is a 2A step-down converter with a typical input voltage of 3.3V and a fixed output voltage of
1.2V or an adjustable output. The 3MHz switching frequency enables the use of small external components.
The ultra-small 2mm x 2mm footprint and high efficiency make the PAM2316 an ideal choice for portable
applications.
The PAM2316 delivers 2A maximum output current while consuming only 55uA no-load quiescent current.
Low RDS(ON) integrated MOSFETs and 100% duty cycle operation make the PAM2316 the ideal choice for
high output voltage, high current applications which require a low dropout threshold.
The PAM2316 provides excellent transient response and output accuracy across the operating range.
The PAM2316 maintains high efficiency throughout the load range. The PAM2316
automatically
optimizes efficiency during light load mode (PSM) and maintains constant frequency and low output ripple
during PWM mode.
Over-temperature and short circuit protection safeguard the PAM2316 and system components from
damage.
The PAM2316 is available in a Pb-free, ultra-small, low profile, 8-pin 2mm x 2mm TDFN package. The
product is rated over a temperature range of -40°C to 85°C.
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.
PAM2316
EVB User Guide
3. Key Features
z
2A Maximum Output Current
z
Tiny 0.47µH Chip Inductor
z
Excellent Transient Response
z
55µA No Load Quiescent Current
z
Input Voltage: 2.7V to 5.5V
z
100% Duty Cycle Low-Dropout Operation
z
Ultra-small, Low Profile 8-pin 2mm x 2mm
z
Internal Soft Start
TDFN Package
z
Over-Temperature and Current Limit
z
z
High Efficiency with 3MHz Switching
Frequency
Fixed or Adjustable Output Voltage
Protection
Options:
z
<1µA Shutdown Current
-
Fixed Output Voltage: 1.2V
z
-40°C to 85°C Temperature Range
-
Adjustable Output Voltage: 1.0V to
z
Pb-Free/Halogen Free Package
3.3V
z
RoHS/REACH Compliant
4. EV Board Schematic
IC1
1
C2
PGND
SW
SW
8
L1
C1
2
Vin
EN
3
1
Vin
2
EN
FB
4
PVin
SW
Vin
EN
FB
AGND
C3
7
6
Vo
EN
R1
C4
R2
5
3
5. EVB PAM2316 EB18AAA Description
PAM2316 EB18AA is an evaluation board for the PAM2316 8pin 2mm x 2mm TDFN, a DC/DC converter.
The board is targeted to be used in providing a simple and convenient evaluation environment for the
PAM2316. 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.
PAM2316
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
0.47µH
0.47µH
0.47µH
1.0µH
1.0µH
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.
PAM2316
EVB User Guide
8. External Compnents Selection
Input & output Capacitors (C1, C2, C3)
(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 (C4)
(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
10µF
C2
1µF
C3
10µF
C4
100pF
L1
0.47µH
R1
R2
150K
150K
Type
X5R/X7R,
Ceramic/0805
X5R/X7R,
Ceramic/0603
X5R/X7R,
Ceramic/0805
COH/CH,
Ceramic/0402
0603
0603
IC1
PAM2316
PCB
PAM2316 EB18AA
Rating
10V
25V
Description
Input Coupling
CAP
Input Coupling
CAP
10V
Output CAP
50V
Feed Forward
CAP
>3A
Inductor
1%
1%
TDFN
2 x 2 8pin
Voltage Set
RES
Vender and Part No.
TAIYO YUDEN
EMK212ABJ106KD-T
TAIYO YUDEN
TMK107 BJ105KA-T
TAIYO YUDEN
EMK212ABJ106KD-T
TAIYO YUDEN
UMK105CH101JV-F
74404300047
Wurth
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.
PAM2316
EVB User Guide
10. PCB Layout Guideline
The following guidelines should be used to help ensure a proper layout:
1). The input capacitor should be close to IC as close as possible.
2). Must put a small decoupling capacitor between Vin Pin and AGND Pin.
3). Minimize the switching loop area to avoid excessive switching noise.
4). AGND and PGND should connect at input capacitor GND.
5). For the good thermal dissipation, PAM2316 has a heat dissipate pad in the bottom side, it should be
soldered to PCB surface. For the copper area can’t be large in the component side, so we can use
multiple vias connect to other side of the PCB.
11. 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.
PAM2316
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.