Datasheet

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LTC2913

2913fb

FEATURES

APPLICATIONS

DESCRIPTION

Dual UV/OV

Voltage Monitor

The LTC

2913 is a dual input voltage monitor intended for

multiple voltages in a variety of applications. Dual inputs for

each voltage allow monitoring two separate undervoltage

(UV) conditions and two separate overvoltage (OV)

conditions. All monitors share a common undervoltage

output and a common overvoltage output. The LTC2913-1

has latching capability for the overvoltage output. The

LTC2913- 2 has functionality to disable both the overvoltage

and undervoltage outputs.

Glitch ﬁ ltering ensures reliable reset operation without

false or noisy triggering.

The LTC2913 provides a precise, versatile, space-con-

scious, micropower solution for voltage monitoring.

Monitors Two Voltages Simultaneously

Adjustable UV and OV Trip Values

Guaranteed Threshold Accuracy: ±1.5%

Input Glitch Rejection

Adjustable Reset Timeout with Disable

44μA Quiescent Current

Open-Drain OV and UV Outputs

Guaranteed OV and UV for V

≥ 1V

Available in 10-Lead MSOP and (3mm × 3mm)

DFN Packages

Desktop and Notebook Computers

Network Servers

Core, I/O Voltage Monitors

Dual OV/UV Supply Monitor Typical Transient Duration

vs Comparator Overdrive

TYPICAL APPLICATION

L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

27.4k1k

44.2k

VH1

LTC2913-1

VL1

VH2

GND TMR

SYSTEM

POWER

SUPPLIES

VL2

2913 TA01a

LATCH

4.53k

22nF

TIMEOUT = 200ms

1k4.53k

0.1μF

3.3V

COMPARATOR OVERDRIVE PAST THRESHOLD (%)

0.1

400

TYPICAL TRANSIENT DURATION (μs)

500

600

700

1 10 100

2913 TA01b

300

200

100

= 2.3V

= 6V

RESET OCCURS

ABOVE CURVE

Summary of content (12 pages)

PAGE 1
LTC2913 Dual UV/OV Voltage Monitor FEATURES DESCRIPTION n The LTC®2913 is a dual input voltage monitor intended for multiple voltages in a variety of applications. Dual inputs for each voltage allow monitoring two separate undervoltage (UV) conditions and two separate overvoltage (OV) conditions. All monitors share a common undervoltage output and a common overvoltage output. The LTC2913-1 has latching capability for the overvoltage output.
PAGE 2
LTC2913 ABSOLUTE MAXIMUM RATINGS (Notes 1, 2) Terminal Voltages VCC (Note 3)............................................. –0.3V to 6V OV, UV ................................................... –0.3V to 16V TMR ..........................................–0.3V to (VCC + 0.3V) VHn, VLn, LATCH, DIS .......................... –0.3V to 7.5V Terminal Currents IVCC ..................................................................+10mA IUV, IOV...............................................................
PAGE 3
LTC2913 ELECTRICAL CHARACTERISTICS The l denotes the speciﬁcations which apply over the full operating temperature range, otherwise speciﬁcations are at TA = 25°C. VCC = 3.3V, VLn = 0.45V, VHn = 0.55V, LATCH = VCC, DIS = Open unless otherwise noted. (Note 2) SYMBOL VSHUNT ΔVSHUNT PARAMETER VCC Shunt Regulator Voltage VCC Shunt Regulator Load Regulation CONDITIONS MIN TYP MAX ICC = 5mA l 6.2 6.6 6.9 V –40ºC < TA < 125ºC l 6.2 6.6 7.
PAGE 4
LTC2913 TIMING DIAGRAMS VLn Monitor Timing VHn Monitor Timing VUOT VHn tUOD UV tUOTO tUOD 1V OV 2913 TD01 UV 1V VLn Monitor Timing (TMR Pin Strapped to VCC) VUOT VUOT VLn tUOD tUOTO 2913 TD02 VHn Monitor Timing (TMR Pin Strapped to VCC) VHn VUOT VLn tUOD tUOD OV 1V tUOD 1V 2913 TD03 2913 TD04 TYPICAL PERFORMANCE CHARACTERISTICS Speciﬁcations are at TA = 25°C, VCC = 3.3V unless otherwise noted. Input Threshold Voltage vs Temperature 6.8 55 0.505 VCC = 5V 0.504 50 0.
PAGE 5
LTC2913 TYPICAL PERFORMANCE CHARACTERISTICS Speciﬁcations are at TA = 25°C, VCC = 3.3V unless otherwise noted. UV Output Voltage vs VCC 5 PULL-DOWN CURRENT, IUV (mA) VHn = 0.55V SEL = VCC UV VOLTAGE (V) 4 3 2 1 0 0 1 3 4 2 SUPPLY VOLTAGE, VCC (V) 5 1.0 VHn = 0.45V SEL = VCC 4 0.8 UV AT 150mV 25°C UV/OV, VOL (V) 5 UV/OV Voltage Output Low vs Output Sink Current UV, ISINK vs VCC 3 2 1 0.4 0 0.
PAGE 6
LTC2913 PIN FUNCTIONS TMR (Pin 9): Reset Delay Timer. Attach an external capacitor (CTMR) of at least 10pF to GND to set a reset delay time of 9ms/nF. A 1nF capacitor will generate an 8.5ms reset delay time. Tie TMR to VCC to bypass timer. UV (Pin 7): Undervoltage Logic Output. Asserts low when either VH input voltage is below threshold. Held low for a programmed delay time after both VH inputs are valid. UV has a weak pull-up to VCC and may be pulled above VCC using an external pull-up.
PAGE 7
LTC2913 APPLICATIONS INFORMATION Voltage Monitoring 2. Choose RB to obtain the desired UV trip point The LTC2913 is a low power dual voltage monitoring circuit with two undervoltage and two overvoltage inputs. A timeout period that holds OV and UV asserted after all faults have cleared is adjustable using an external capacitor and is externally disabled. Once RA is known, RB is chosen to set the desired trip point for the undervoltage monitor.
PAGE 8
LTC2913 APPLICATIONS INFORMATION Power-Up/Power-Down As soon as VCC reaches 1V during power-up, the UV output asserts low and the OV output weakly pulls to VCC. The LTC2913 is guaranteed to assert UV low and OV high under conditions of low VCC, down to VCC = 1V. Above VCC = 2V (2.1V maximum), the VH and VL inputs take control. Once both VH inputs and VCC are valid, an internal timer is started. After an adjustable delay time, UV weakly pulls high. The two extreme conditions, with a relative accuracy of 1.
PAGE 9
LTC2913 APPLICATIONS INFORMATION UV/OV Timing Shunt Regulator The LTC2913 has an adjustable timeout period (tUOTO) that holds OV or UV asserted after all faults have cleared. This assures a minimum reset pulse width allowing a settling time delay for the monitored voltage after it has entered the valid region of operation. The LTC2913 has an internal shunt regulator. The VCC pin operates as a direct supply input for voltages up to 6V.
PAGE 10
LTC2913 APPLICATIONS INFORMATION where RPD is the on-resistance of the internal pull-down transistor, typically 50Ω at VCC > 1V and at room temperature (25°C). CLOAD is the external load capacitance on the pin. Assuming a 150pF load capacitance, the fall time is 16.5ns. is held high, the latch is bypassed and the OV pin behaves the same as the UV pin with a similar timeout period at the output. If LATCH is pulled low while the timeout period is active, the OV pin latches as before.
PAGE 11
LTC2913 PACKAGE DESCRIPTION DD Package 10-Lead Plastic DFN (3mm × 3mm) (Reference LTC DWG # 05-08-1699) R = 0.115 TYP 6 0.38 ± 0.10 10 0.675 ±0.05 3.50 ±0.05 1.65 ±0.05 2.15 ±0.05 (2 SIDES) 3.00 ±0.10 (4 SIDES) PACKAGE OUTLINE 1.65 ± 0.10 (2 SIDES) PIN 1 TOP MARK (SEE NOTE 6) (DD10) DFN 1103 5 0.25 ± 0.05 0.50 BSC 0.75 ±0.05 0.200 REF 0.25 ± 0.05 1 0.50 BSC 2.38 ±0.05 (2 SIDES) 2.38 ±0.10 (2 SIDES) 0.00 – 0.05 BOTTOM VIEW—EXPOSED PAD RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS NOTE: 1.
PAGE 12
LTC2913 TYPICAL APPLICATION Dual UV/OV Supply Monitor with LED Undervoltage and Overvoltage Indicator and Manual Undervoltage Reset Button, 10% Tolerance, 12V, 5V 12V POWER 5V SUPPLIES 0.1μF 44.2k 1k 2.05M 510Ω 510Ω LED LED VCC VH1 LTC2913-2 SYSTEM VL1 OV VH2 UV 4.53k 100k 10k VL2 GND DIS TMR 2913 TA05 22nF TIMEOUT = 200ms MANUAL RESET BUTTON (NORMALLY OPEN) RELATED PARTS PART NUMBER LTC1326/ LTC1326-2.5 LTC1726-2.5/ LTC1726-5 LTC1727-2.5/ LTC1727-5 LTC1728-1.8/ LTC1728-3.3 LTC1728-2.