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-48V Programmable Hot Swap Sequencing Power Controller
–
FEATURES AND APPLICATIONS
Features:
• Soft Starts Main Power Supply on Card Insertion or
System Power Up
• In-Rush Current Limiting
• Master Enable to Allow System Control of Power Up or
Down
• Programmable Independent Control of up to 4 DC/DC
Converters via 4 Power Good Signals, PG[4:1]#
• Highly Programmable Circuit Breaker Level and Mode
– Programmable Quick-Trip™ Value, Current
Limiting, Duty Cycle Times, and Over-Current Filter
• Programmable Host Voltage Fault Monitoring
– Programmable UV/OV Filter and UV Hysteresis
• Programmable Fault Mode: Latched or Duty Cycle
• Internal Shunt Regulator Allows for a Wide Supply
Range (typically -32 to -72 Volts)
2
• I
C 2-Wire Serial Bus Interface for Programming,
Power On/Off and Operational Status
Applications:
• Telecom Hot-Swap Card
• Distributed Power Architectures
• Power-on LAN, IEEE 802.3
–
SIMPLIFIED APPLICATION DRAWING
-48V RTN (0V)
D1 Dual
MMBD1401
R1
-48V2
(Short Pins)
470
-48V1
R6
D5
D6
-48V
R2
267K, 1%
R3
10K, 1%
R4
10K, 1%
D2
-48V1
D3
-48V2
Note 1: Safety isolation interface may be required. See Apps Section.
© SUMMIT Microelectronics, Inc. 2005
RD
10K, 1/2W
42
26
28
25
46
3
PD2#
2
PD1#
SMH4804
20
UV
24
OV
17, 18
13
48
C2
R8
100nF
1K
R7
10
R5
C1
0.02
100nF
Q1
IRF1310N
Figure 1. SMH4804 Simplified Application Diagram
• 1717 Fox Drive • San Jose CA 95131
2050 3.8 10/13/05
–
INTRODUCTION
The SMH4804 is a user-programmable -48V power supply
controller designed to control the hot-swapping of plug-in
cards and to sequence supplies in a distributed power
environment. The SMH4804 drives an external power
MOSFET switch that connects the bus side supply to the
card side load and controls in-rush current while providing
both current regulation and over-current protection. When
the source and drain voltages of the external MOSFET are
within specification, the SMH4804 asserts four PG[4:1]#
power-good logic outputs either simultaneously or
sequenced at programmable intervals to enable DC-DC
converters to distribute card side power.
Additional features of the device include: UV and OV
monitor, master enable or temperature sense input (EN/
TS), 2.5V and 5V reference outputs for expanding monitor
functions, two Pin-Detect enable inputs (PD1# and PD2#)
for card insertion verification, and duty-cycle or latched
over-current protection modes. All features are
programmed in nonvolatile registers through the I
interface which is simplified with the SMX3200 interface
adapter and Windows GUI software available from Summit
Microelectronics. Engineers can program the device
directly in-circuit with units of voltage, current and time,
allowing fast design cycles.
2
I
C
15
22
10
12
36
PG#1
37
PG#2
34
PG#3
40
PG#4
Note 1
44
R9
100K
C4
C3
100nF
10nF
D4
MMBD1401
• Phone 408 436-9890
SMH4804
3
7
Vin+
Vout+
2
On/Off
8
1
Vout-
Vin-
7
3
Vin+
Vout+
2
On/Off
8
1
Vout-
Vin-
7
3
Vin+
Vout+
2
On/Off
8
1
Vout-
Vin-
3
7
Vin+
Vout+
2
On/Off
8
1
Vout-
Vin-
• Fax 408 436-9897 • www.summitmicro.com
2
C
5.0V
3.3V
2.5V
1.8V
1
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Related Manuals for Summit SMH4804
Summary of Contents for Summit SMH4804
- Page 1 – – FEATURES AND APPLICATIONS INTRODUCTION The SMH4804 is a user-programmable -48V power supply Features: controller designed to control the hot-swapping of plug-in cards and to sequence supplies in a distributed power • Soft Starts Main Power Supply on Card Insertion or environment.
- Page 2 DECODE MODE VGATE RESET# FAULT LATCH P. D. FILTER DUTY PROGRAMM- CYCLE FAULT# ABLE TIMER DELAY – Programmable 50mV Shutdown CBSENSE Timer – Programmable Quick Response Ref. Voltage 2050 BD Figure 2. SMH4804 Block Diagram 2050 3.8 10/13/05 Summit Microelectronics...
- Page 3 DC/DC controllers. external resistive divider ladder to sense whether or not the The SMH4804 may be configured so that after any of these host supply voltage is within the user-defined limits. The events occurs, the VGATE output shuts off and either...
- Page 4 2.5V. The default under-voltage hysteresis level is rises above 2.5V, the PG[4:1]# and VGATE outputs are set to 62.5mV. In default conditions the SMH4804 is not in disabled immediately. an under-voltage state once the UV voltage rises above 2.5V;...
- Page 5 DC/DC controllers. A built-in PG[4]# to be driven by the SMH4804. shutdown timer allows the SMH4804 to ignore the state of the FS# input until the timer period expires. The timer period This cascaded control mechanism is useful for enabling is defined in bits 2:0 of Register 5.
- Page 6 SMH4804 Functional Description Circuit Breaker Operation 50mV The SMH4804 provides a number of circuit breaker functions to protect against over-current conditions. A CBSENSE sustained over-current event could damage the host supply and/or the load circuitry. The board’s load current passes...
- Page 7 CBSENSE 50mV Resetting FAULT# When the circuit breaker trips, the VGATE output is turned off and the SMH4804 drives FAULT# low. There are two methods to reset the circuit breaker which are selectable VGATE with the MODE pin: • When the MODE is held high or left floating, the circuit breaker is in the duty-cycle mode.
- Page 8 SDA and SCL. Device configuration utilizing the Windows based SMT4804 graphical user interface (GUI) is highly recommended. The software is available from the Summit website (www.summitmicro.com). Using the GUI in conjunction with this datasheet, simplifies the process of device prototyping and the interaction of the various functional blocks.
- Page 9 SMH4804 Package And Pin Configurations – PACKAGE AND PIN CONFIGURATIONS PACKAGE AND PIN CONFIGURATIONS 28-Pin SOIC DRAIN SENSE PG4# VGATE PG2# EN/TS PG1# PD1# PG3# PD2# ENPGA ENPGB FAULT# RESET# ENPGC 2.5VREF MODE 5VREF CBSENSE 2050 SOIC PCon 2.1 Figure 10. 28-Pin SOIC Package Pinout...
- Page 10 SMH4804 Pin Descriptions – PIN DESCRIPTIONS Table 1 provides the type, name, and description of the SMH4804 pins. Pin numbers are provided for both the 28-pin SOIC and 48-pin TQFP packages. Pin Number Pin Number Pin Type Pin Name Description...
- Page 11 The shutdown timer allows supervisory circuits on the secondary side (which are not powered up initially) to control shut down of the SMH4804 via an opto-isolator. This input has no pull-up resistor. 5VREF...
- Page 12 ENPGx inputs are high. The voltage on this pin cannot exceed 12V relative to V . ENPGx refers to the ENPGA, ENPGB, and ENPGC inputs. Table 1. SMH4804 Pin Descriptions (Continued) 2050 3.8 10/13/05 Summit Microelectronics...
- Page 13 12V with respect to V . A resistor must be placed in series with the V pin to limit the regulator current in the application illustrations). Table 1. SMH4804 Pin Descriptions (Continued) Summit Microelectronics 2050 3.8 10/13/05...
- Page 14 SMH4804 Absolute Maximum Ratings – – ABSOLUTE MAXIMUM RATINGS RECOMMENDED OPERATING CONDITIONS Temperature Under Bias......–55°C to 125°C Temperature Range (Ambient) ....-40 C to +85 Power Supply Current (I ) ........15 mA Supply Voltage(V ) (I = 5 mA)..... 11V to 13V Storage Temperature ........
- Page 15 SMH4804 DC Operating Characteristics – DC OPERATING CHARACTERISTICS (Over recommended operating conditions, unless otherwise notes. All voltages are relative to GND.) Symbol Parameter Conditions Unit Supply voltage IDD = 3 mA 5V reference output voltage IDD = 3 mA 5.00 5.25...
- Page 16 SMH4804 AC Operating Characteristics – AC OPERATING CHARACTERISTICS (Over recommended operating conditions, unless otherwise notes. All voltages are relative to GND.) Symbol Description Conditions Unit Comment = 5 µs µs See Figure 5, = 50 µs µs Figure 6, Programmable Over-Current Filter Figure 7, and = 150 µs...
- Page 17 SMH4804 I2C 2-Wire Serial Interface AC Operating Characteristics – C 2-WIRE SERIAL INTERFACE AC OPERATING CHARACTERISTICS (Over recommended operating conditions, unless otherwise notes. All voltages are relative to GND.) Symbol Parameter Conditions Units SCL clock frequency µs Clock period low µs...
- Page 18 PD1#/ PD2# – V Note - A 'Fault' condition VGATE has caused Drain Sense to go high. 2.5V DRAIN SENSE 50mV CBSENSE <t PG1# PG2# PG3# PG4# 2050 Fig01 2.1 Figure 13. SMH4804 Power-On Sequences 2050 3.8 10/13/05 Summit Microelectronics...
- Page 19 Ch 1 (50V/Div) = MOSFET Drain (Yellow trace) Ch 1 (50V/Div) = MOSFET Drain (Yellow trace) Ch 2 (5V/Div) = SMH4804 UV pin (Blue trace) Ch 2 (5V/Div) = SMH4804 UV pin (Blue trace) Ch 3 (10V/Div) = MOSFET Gate (Purple trace)
- Page 20 Dropper Resistor Selection 2.5V = 10 K Ω R1 = The SMH4804 is powered from the high-voltage supply via µ a dropper resistor, R . The dropper resistor must provide the SMH4804 (and its loads) with sufficient operating current under minimum supply voltage conditions, but must 2050 3.8 10/13/05...
- Page 21 DDMIN voltage, and VS is the highest operating supply voltage. the SMH4804 from the low end of the voltage, and divide by the minimum I value. Using this value of resistance as R In circumstances where the input voltage may swing over a find the operating current that would result from running at wide range (e.g., from 20V to 100V) the maximum current...
- Page 22 Soft Start Slew Rate Control Figure 14. The –48V turn on time is controlled by the SMH4804 and by The SMH4804 asserts each of its output enabling pins the values of R4, C1 and C2 in Figures 21, 22, and 23. The...
- Page 23 SMH4804 Timing Diagram −48V RTN (0V) −48V RTN (0V) 6.8kΩ ½W MMBTA06LT1 EN/TS PG4# 100kΩ MMBTA06LT1 PG3# 100kΩ MMBTA06LT1 PD1# PG2# SMH4804 PD2# 100kΩ 5V REF FAULT# RESET# 47kΩ MODE MMBTA06LT1 PG1# MMBD1401 100nF 100nF 3.3nF 100nF 1kΩ 100µF 68kΩ...
- Page 24 SMH4804 Timing Diagram −48V RTN (0V) −48V RTN (0V) 6.8kΩ ½W 50kΩ @T MAX 1kΩ 100kΩ 1MΩ EN/TS – LMV331 MMBTA06LT1 PG4# 50kΩ 100kΩ MMBTA06LT1 PG3# 100kΩ MMBTA06LT1 PD1# SMH4804 PG2# PD2# 100kΩ 5V REF FAULT# MMBTA06LT1 RESET# PG1# MODE 100kΩ...
- Page 25 SMH4804 Timing Diagram −48V RTN (0V) 6.8kΩ ½W 100kΩ EN/TS +VIN +VOUT –VIN –VOUT MMBTA06LT1 PG4# ON/OFF 100kΩ +VIN +VOUT –VIN –VOUT MMBTA06LT1 ISOLATED PG3# ON/OFF SMH4804 OUTPUTS 100kΩ +VIN +VOUT –VIN –VOUT MMBTA06LT1 PD1# PG2# ON/OFF PD2# 5V REF 100kΩ...
- Page 26 SMH4804 Timing Diagram IRQ# SMS44 −48V RTN (0V) 5V REF DC/DC PGx# – SMH4804 2050 Fig19 –48V Figure 18. Controlling FS# with Secondary Feedback CHASSIS CARD −48V RTN (0V) –48V Ret -48V1 PD1# (Short Pins) PD2# -48V2 PD1# SMH4804 -48V PD2# –48V A...
- Page 27 Master, and the controlled device During a read by the Master device, the SMH4804 transmits is called the Slave. In all cases the SMH4804 is referred to eight bits of data, then releases the SDA line, and monitors as a Slave device since it never initiates any data transfers.
- Page 28 Stop condition. The SMH4804 discontinues Figure 23. Read Protocol data transmission and reverts to its standby power mode. During a Master write, the SMH4804 receives eight bits of data, then generates an Acknowledge signal. It device Sequential Reads...
- Page 29 Master and the controlled device directly between a PC’s parallel port and the and the 10-pin is called the Slave. The SMH4804 is always a Slave device, connector shown in Figure 26. The application’s values are since it never initiates any data transfers.
- Page 30 I2C control, including device type address, configuration register R/W status, and slave address response control. Power-good sequence speed, PD[2:1]# pin detect delay time. Non-volatile fault latch. Set by hardware when a fault is detected. Table 2. SMH4804 Default Register Settings 2050 3.8 10/13/05 Summit Microelectronics...
- Page 31 SMH4804 Registers – REGISTERS Register 2 - Address 0010 This register is used to select both the over-current delay and the quick trip threshold for the electronic circuit breaker. Bits Default Description µ Set Over-current delay to 400 µ Set Over-current delay to 150 0b10 µ...
- Page 32 This register is used to control the sequencing delays from PG1# to PG2#, PG2# to PG3#, and PG3# to PG4#. The SMH4804 provides two levels of sequencing delay: fast and slow, which is selected by programming bit 3 of Register 9. These two bits are effectively concatenated with R9 bit 3, providing 8 programmable delay periods.
- Page 33 SMH4804 Registers Register 4 - Address 0100 Register 4 enables PG[4:1]# signal sequencing, sets the O/U voltage filter timing, and selects the circuit breaker cycle time. Bit 3 of this register enables or disables the PG[4:1]# sequence delays. When set, the delays are defined in registers 3 and 9.
- Page 34 SMH4804 Registers Register 5 - Address 0101 Register 5 controls the function of the nonvolatile fault latch and provides general control for the FS# input. Bit 3 controls the enabling of the non-volatile latch. Bits 2:0 configure the FS# input.
- Page 35 SMH4804 Registers One last event mode, 000 disables the cascade effect and sets up PG4# going true as the trigger event. FS# BIN, must be pulled high before t elapses, or VGATE and all of the PG[4:1]# outputs are disabled.
- Page 36 SMH4804 Registers Register 6 - Address 0110 This register enables what events are recorded in the nonvolatile fault latch if bit 3 of R5 is cleared. The high order bits of this register control whether the under and over voltage pins are filtered, and the two low order bits program the current regulation time period.
- Page 37 1 select the register access capability, and bit 0 determines whether the device must receive a bus address that corresponds to the biasing of the address pins. Note: If the fault latch option is selected and write access is denied the SMH4804 cannot be cleared of a fault condition.
- Page 38 NVFL is enabled (Register 5, Bit 3 cleared), bit 0 of Register C is automatically set (written with a logic ‘1’) when the circuit breaker trips. So long as the bit remains set, the SMH4804 is not able to drive VGATE or the PG[4:1]# outputs.
- Page 39 SMH4804 Packaging – PACKAGING Figure 27 shows the package dimensions for the 28-pin SOIC package. 0.701 - 0.711* (17.01 - 18.06) Ref Jedec MS-013 0.394 - 0.419 (10.00 - 10.65) 0.291 - 0.299 (7.391 - 7.595) 0.093 - 0.104 0.037 - 0.045 (2.362 - 2.642)
- Page 40 SMH4804 Packaging Figure 28 shows the package dimensions for the 48-pin TQFP package. 0.354 Inches (9.00) BSC (Millimeters) 0.276 BSC (B) (7.00) 0.02 (0.5) 0.007 - 0.011 (0.17 - 0.27) DETAIL "A" Ref Jedec M S-026 0.037 - 0.041 0.95 - 1.05 0.039...
- Page 41 Microelectronics, Inc. shall not be liable for any damages arising as a result of any error or omission. SUMMIT Microelectronics, Inc. does not recommend the use of any of its products in life support or aviation applications where the failure or malfunction of the product can reasonably be expected to cause any failure of either system or to significantly affect their safety or effectiveness.
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