SI3500-A-GM Silicon Laboratories Inc, SI3500-A-GM Datasheet

IC POE SWITCH PWR OVER LAN 20QFN

SI3500-A-GM

Manufacturer Part Number
SI3500-A-GM
Description
IC POE SWITCH PWR OVER LAN 20QFN
Manufacturer
Silicon Laboratories Inc
Type
Power over Ethernet Switch (PoE)r
Datasheet

Specifications of SI3500-A-GM

Package / Case
20-QFN
Applications
IP Phones, Power over LAN, Network Routers and Switches
Internal Switch(s)
Yes
Current Limit
525mA
Voltage - Supply
42 V ~ 57 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Minimum Operating Temperature
- 10 C
Mounting Style
SMD/SMT
Product
Ethernet Controllers
Maximum Operating Temperature
+ 85 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
Other names
336-1844-5

Available stocks

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Manufacturer
Quantity
Price
Part Number:
SI3500-A-GM
Manufacturer:
MURATA
Quantity:
34 000
Part Number:
SI3500-A-GM
Manufacturer:
SILICON LABS/芯科
Quantity:
20 000
Company:
Part Number:
SI3500-A-GM
Quantity:
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Part Number:
SI3500-A-GMR
Manufacturer:
SILICON LABS/芯科
Quantity:
20 000
Company:
Part Number:
SI3500-A-GMR
Quantity:
480
5 0 V I
Features
Applications
Description
The Si3500 is a highly-integrated, high-voltage (42 to 57 V) input dc-to-dc
converter with integrated PWM control and power FET. The output can be
adjusted for various applications in the range of 1.8 to 12 VDC.
The integrated hot swap switch provides a 2-level current limit for slow
charging of the input filter capacitor followed by overcurrent protection at
400 mA.
The hot swap switch overcurrent protection fully protects the Si3500 from
short-circuit damage as long as the inductor does not saturate. For
situations where it is desirable to use a smaller inductor, it is possible to
reduce the overcurrent protection with the addition of one low-cost
transistor.
The Si3500 can be configured to provide an isolated output voltage or a
non-isolated output that is positive or negative with respect to the positive
input rail.
Input undervoltage and overvoltage lockout functions are fully-integrated.
A 65 V input clamp is also integrated. Output voltage softstart is enabled
by just one capacitor to control the output rise time at startup.
Rev. 1.1 10/09
Integrated switching regulator
controller with on-chip power FET
Input range 42 to 57 V
Output can be set from 1.8 to
12 V
Output power up to 10 W
Highly-integrated IC enables
compact solution footprints




3.3 V power supply generation
for Power over Ethernet Power
Sourcing supply, such as Si3452
suppressor
hotswap switch
Minimal external components
Integrated transient surge
Integrated dual current-limited
Integrated switching power FET
N PU T
D C
T O
Copyright © 2009 by Silicon Laboratories
D C C
Internet appliances
Network devices
Supports non-isolated and
isolated switching topologies
Comprehensive protection
circuitry




50% duty cycle limiting
Low-profile, 5x5 mm, 20-pin QFN
RoHS-compliant
Transient overvoltage protection
Undervoltage lockout
Thermal shutdown protection
Short circuit protection
ONVERTER
ISOSSFT
EROUT
SSFT
See Ordering Guide on page
VDD
Ordering Information:
1
2
3
4
Pin Assignments
20
5
5 x 5 mm QFN
(Top View)
19
page 14.
6
Si3500
18
VNEG
(PAD)
7
17
8
16
9
15
10
14
13
12
11
Si3500
NC
NC
VPOSF
NC

Related parts for SI3500-A-GM

SI3500-A-GM Summary of contents

Page 1

... The Si3500 can be configured to provide an isolated output voltage or a non-isolated output that is positive or negative with respect to the positive input rail. Input undervoltage and overvoltage lockout functions are fully-integrated. ...

Page 2

... Si3500 Functional Block Diagram Central Protection Bias VNEG 2 Error Amplifier PWM Soft Start Control Si3500 Rev. 1.1 SWO ...

Page 3

... Dual Current Limit Hot Swap switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 3.4. Switching Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 3.5. Switcher Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 3.6. Switching Regulator Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 4. Layout Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 5. Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6. Package Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 7. Recommended PCB Landing Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 8. Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 Rev. 1.1 Si3500 Page 3 ...

Page 4

... Si3500 1. Electrical Specifications Table 1. Recommended Operating Conditions Description VPOS – VNEG input voltage Ambient Operating Temperature Note: Unless otherwise noted, all voltages referenced to VNEG. All minimum and maximum specifications are guaranteed and apply across the recommended operating conditions. Typical values apply at nominal supply voltage and ambient temperature unless otherwise noted ...

Page 5

... Permanent device damage may occur if the maximum ratings are exceeded. Functional operation should be restricted to those conditions specified in the operational sections of this data sheet. Exposure to absolute maximum rating conditions for extended periods may adversely affect device reliability. 2. Care should be taken to follow layout guidelines. 1 Description 1,2 Description Rev. 1.1 Si3500 Rating Unit –0 –0 –0 – ...

Page 6

... Si3500 Table 5. Electrical Characteristics Parameter 1 Current Limit Hotswap FET On-Resistance + R SENSE Switcher Frequency Maximum Switcher Duty Cycle Switching FET On-Resistance 2 Regulated Feedback @ pin FB Regulated Output Voltage Tolerance VDD accuracy @ 0.8 mA Softstart charging current Thermal Shutdown Thermal Shutdown Hysteresis Notes turn-on, before the HSO load capacitor is charged, the current limit is set at the inrush level. After the capacitor has been charged within ~1 ...

Page 7

... RBIAS C1 Figure 2. Schematic (Isolated 3.3 V Output)* *Note: This is a simplified schematic. Refer to Si3452 reference design databases for complete application schematic. Cssft FB RBIAS Si3500 SWO VNEG EROUT SWO C8 ISOSSFT PS2911 VDD Si3500 R2 EROUT Rev. 1.1 Si3500 +VOUT 3.3 V Cout 68µH -VOUT Ccomp ...

Page 8

... RBIAS to reduce Short circuit current limit C1 EROUT Figure 3. Schematic—Non-Isolated 3.3 V Output* *Note: This is a simplified schematic. Refer to Si3452 reference design databases for complete application schematic. Figure 4. Startup Waveform for Current in Figure SWO C8 ISOSSFT PS2911 VDD Si3500 R2 EROUT Rev. 1 Connect to +Vin ...

Page 9

... Functional Description 3.1. Input Surge Protection The Si3500 has Zener diode clamp on the input between VPOS1 and VNEG. The diode is designed to limit the input voltage to less than 80 V for surges and 50 µsec duration. This provides protection against hot plugging the input power supply. ...

Page 10

... Care must be taken to connect the thermal pad of the Si3500 to an appropriate heat spreader. For full-power applications square in plane with at least 9 thermal vias is recommended. This heat spreader must be electrically connected to the negative input power supply ...

Page 11

... Pin Descriptions ISOSSFT Table 8. Si3500 Pin Descriptions (Top View) Pin# Name 1 EROUT Error-amplifier output and PWM input; directly connected to opto-coupler in isolated or boost applications. 2 SSFT Soft-start output pin ramps voltage across external soft-start capacitor to allow switcher to ramp output slowly. 3 VDD 5 V supply rail for switcher; provides drive for opto-coupler. ...

Page 12

... Si3500 Table 8. Si3500 Pin Descriptions (Top View) (Continued) 16 VPOS2 High-voltage supply, positive rail sense node. 17 VSS1 Negative supply rail for switcher; externally tied to HSO. 18 SWO Switching transistor output; drain of switching N-FET. 19 VSS2 Negative supply rail for switcher; externally tied to HSO Regulated feedback input in non-isolated application. ...

Page 13

... Package Outline Figure 5 illustrates the package details for the Si3500. Table 9 lists the values for the dimensions shown in the illustration. Figure 5. 20-Lead Quad Flat No-Lead Package (QFN) Dimension aaa bbb ccc ddd Notes: 1. All dimensions shown are in millimeters (mm) unless otherwise noted. ...

Page 14

... Si3500 7. Recommended PCB Landing Pattern 14 Figure 6. PCB Land Pattern Rev. 1.1 ...

Page 15

... A 2x2 array of 1.2 mm square openings on 1.4 mm pitch should be used for the center ground pad. Card Assembly No-Clean, Type-3 solder paste is recommended. 10. The recommended card reflow profile is per the JEDEC/IPC J-STD-020C specification for Small Body Components. Nom Max 2.75 2.80 2.75 2.80 0.30 0.35 0.95 1.00 4.70 4.70 0.80 Rev. 1.1 Si3500 15 ...

Page 16

... Si3500 8. Ordering Guide * Part Number Si3500-A-GM 20-pin QFN, RoHS compliant *Note: Add an “R” at the end of the part number to denote tape and reel option. 16 Package Temp Range – °C Rev. 1.1 Recommended Maximum Output Power < ...

Page 17

... OCUMENT HANGE IST Revision 0.1 to Revision 1.0  Updated revision number to 1.0 to reflect production status.  Updated Table 4 on page 5. Revision 1.0 to Revision 1.1  Editorial changes in "4. Layout Guidelines" on page 10. Rev. 1.1 Si3500 17 ...

Page 18

... Si3500 C I ONTACT NFORMATION Silicon Laboratories Inc. 400 West Cesar Chavez Austin, TX 78701 Tel: 1+(512) 416-8500 Fax: 1+(512) 416-9669 Toll Free: 1+(877) 444-3032 Please visit the Silicon Labs Technical Support web page: https://www.silabs.com/support/pages/contacttechnicalsupport.aspx and register to submit a technical support request. The information in this document is believed to be accurate in all respects at the time of publication but is subject to change without notice. ...

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