SNVS088F May   2004  – April 2016 LM3704

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Pin Configuration and Functions
  5. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Characteristics
  6. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Reset Output
      2. 6.3.2 Reset Threshold
      3. 6.3.3 Manual Reset Input (MR)
      4. 6.3.4 Power-Fail Comparator (PFI/PFO)
      5. 6.3.5 Low-Line Output (LLO)
    4. 6.4 Device Functional Modes
      1. 6.4.1 RESET Output Low
      2. 6.4.2 RESET Output High
  7. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
      3. 7.2.3 Application Curves
    3. 7.3 System Examples
  8. 8 Power Supply Recommendations
  9. 9 Layout
    1. 9.1 Layout Guidelines
    2. 9.2 Layout Example
  10. 10Device and Documentation Support
    1. 10.1 Device Support
      1. 10.1.1 Device Nomenclature
    2. 10.2 Community Resources
    3. 10.3 Trademarks
    4. 10.4 Electrostatic Discharge Caution
    5. 10.5 Glossary
  11. 11Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

5 Specifications

5.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)(1)
MIN MAX UNIT
Supply voltage, VCC –0.3 6 V
All other inputs –0.3 VCC + 0.3 V
Power dissipation See(2)
Storage temperature, Tstg –65 150 °C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(MAX), the junction-to-ambient thermal resistance, θJ-A, and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated using:
LM3704 10136933.gif
Where the value of θJ-A for the 10-pin VSSOP package is 195°C/W in a typical printed-circuit board (PCB) mounting and the DSBGA package is 220°C/W.

5.2 ESD Ratings

VALUE UNIT
V(ESD) Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) ±1500 V
Charged-device model (CDM), per JEDEC specification JESD22-C101(2) ±150
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.

5.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)
MIN MAX UNIT
TA Free-air temperature –40 85 °C

5.4 Thermal Information

THERMAL METRIC(1) LM3704 UNIT
DGS (VSSOP)
10 PINS
RθJA Junction-to-ambient thermal resistance 163.7 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 58.3 °C/W
RθJB Junction-to-board thermal resistance 83.5 °C/W
ψJT Junction-to-top characterization parameter 6 °C/W
ψJB Junction-to-board characterization parameter 82.2 °C/W
RθJC(bot) Junction-to-case (bottom) thermal resistance — °C/W
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report, SPRA953.

5.5 Electrical Characteristics

at TJ = 25°C and VCC = 2.2 V to 5.5 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
POWER SUPPLY
VCC Operating voltage LM3704, TJ = –40°C to 85°C 1 5.5 V
ICC VCC supply current All inputs = VCC,
all outputs floating		 TJ = 25°C 28 µA
TJ = –40°C to 85°C 50
RESET THRESHOLD
VRST Reset threshold VCC falling TJ = 25°C –0.5% VRST 0.5%
TJ = –40°C to 85°C –2% 2%
TJ = 0°C to 70°C –1.5% 1.5%
VRSTH Reset threshold hysteresis 0.0032 × VRST mV
tRP Reset time-out period Reset time-out period = C TJ = 25°C 200 ms
TJ = –40°C to 85°C 140 280
tRD VCC to reset delay VCC falling at 1 mV/µs 20 µs
RESET
VOL RESET VCC > 1.0 V, ISINK = 50 µA,
TJ = –40°C to 85°C		 0.3 V
VCC > 1.2 V, ISINK = 100 µA,
TJ = –40°C to 85°C		 0.3
VCC > 2.25 V, ISINK = 900 µA,
TJ = –40°C to 85°C		 0.3
VCC > 2.7 V, ISINK = 1.2 mA,
TJ = –40°C to 85°C		 0.3
VCC > 4.5 V, ISINK = 3.2 mA,
TJ = –40°C to 85°C		 0.4
VOH RESET VCC > 2.25 V, ISOURCE = 300 µA,
TJ = –40°C to 85°C		 0.8 × VCC V
VCC > 2.7 V, ISOURCE = 500 µA,
TJ = –40°C to 85°C		 0.8 × VCC
VCC > 4.5 V, ISOURCE = 800 µA,
TJ = –40°C to 85°C		 VCC − 1.5
PFI/MR
VPFT PFI input threshold TJ = 25°C 1.225 V
TJ = –40°C to 85°C 1.2 1.25
VMRT MR Input threshold TJ = –40°C to 85°C MR, low 0.8 V
MR, high 2
VPFTH/
VMRTH		 PFI/MR threshold hysteresis PFI/MR falling, VCC = VRST MAX to 5.5 V 0.0032 × VRST mV
IPFI Input current (PFI only) TJ = –40°C to 85°C –75 75 nA
RMR MR pullup resistance TJ = 25°C 56 kΩ
TJ = –40°C to 85°C 35 75
tMD MR to reset delay 12 µS
tMR MR pulse width TJ = –40°C to 85°C 25 µS
PFO, LLO
VOL PFO, LLO output low voltage VCC > 2.25 V, ISINK = 900 µA,
TJ = –40°C to 85°C		 0.3 V
VCC > 2.7 V, ISINK = 1.2 mA,
TJ = –40°C to 85°C		 0.3
VCC > 4.5 V, ISINK = 3.2 mA,
TJ = –40°C to 85°C		 0.4
VOH PFO, LLO output high voltage VCC > 2.25 V, ISOURCE = 300 µA,
TJ = –40°C to 85°C		 0.8 VCC V
VCC > 2.7 V, ISOURCE = 500 µA,
TJ = –40°C to 85°C		 0.8 VCC
VCC > 4.5 V, ISOURCE = 800 µA,
TJ = –40°C to 85°C		 VCC − 1.5
LLO OUTPUT
VLLOT LLO output threshold VLLO − VRST, VCC falling TJ = 25°C 1.02 × VRST V
TJ = –40°C to 85°C 1.01 × VRST 1.03 × VRST
VLLOTH Low-line comparator hysteresis 0.0032 × VRST mV
tCD Low-line comparator delay VCC falling at 1 mV/µs 20 µs
LM3704 10136928.png Figure 1. LM3704 Reset Time With MR
LM3704 10136929.png Figure 2. LLO Output
LM3704 10136930.png Figure 3. PFI Comparator Timing Diagram

5.6 Typical Characteristics

LM3704 10136915.gif Figure 4. Supply Current vs Supply Voltage
LM3704 10136912.gif Figure 6. Normalized Reset Threshold Voltage
vs Temperature
LM3704 10136910.gif
Figure 8. Reset Timeout Period vs Temperature
LM3704 10136914.gif Figure 10. Low-Line Comparator Propagation Delay vs Temperature
LM3704 10136911.gif Figure 5. 3.3-V Supply Current vs Temperature
LM3704 10136932.gif Figure 7. Reset Timeout Period vs VCC
LM3704 10136916.gif
VCC = 3.3 V
Figure 9. Maximum Transient Duration
vs Reset Comparator Overdrive