PT7M7433TAE datasheet, PDF - EEWORLD Datasheet

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PT7M7433TAE: DescriptionSupervisory Circuit; CategoryPower/power management The power supply circuit; File Size329KB，7 Pages; ManufacturerPericom Semiconductor Corporation (Diodes Incorporated); Websitehttps://www.diodes.com/; Environmental Compliance

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PT7M7433TAE Overview

Supervisory Circuit

PT7M7433TAE Parametric

Parameter Name	Attribute value
Is it Rohs certified?	conform to
Maker	Pericom Semiconductor Corporation (Diodes Incorporated)
Parts packaging code	SOIC
package instruction	TSSOP,
Contacts	5
Reach Compliance Code	compli
ECCN code	EAR99
Adjustable threshold	YES
Analog Integrated Circuits - Other Types	POWER SUPPLY SUPPORT CIRCUIT
JESD-30 code	R-PDSO-G5
JESD-609 code	e3
length	2.9 mm
Number of channels	1
Number of functions	1
Number of terminals	5
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Package body material	PLASTIC/EPOXY
encapsulated code	TSSOP
Package shape	RECTANGULAR
Package form	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	NOT SPECIFIED
Certification status	Not Qualified
Maximum seat height	1.1 mm
Maximum supply voltage (Vsup)	5.5 V
Minimum supply voltage (Vsup)	1.8 V
Nominal supply voltage (Vsup)	3.7 V
surface mount	YES
Temperature level	INDUSTRIAL
Terminal surface	MATTE TIN
Terminal form	GULL WING
Terminal pitch	0.95 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	NOT SPECIFIED
width	1.6 mm

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PT7M7433/34/35

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P

Supervisory Circuit

Features



User-Adjustable Low/High Thresholds with 615mV

Internal Reference

Low Current (1.5μA typ)

PT7M7427xx

PT7M7428xx

Single Low-Battery Outputs

LBO

Push-Pull LBO, Open-Drain LBO and

Open-Drain

LBO options

GND

90ms Minimum LBO Timeout Period

Immune to Short Battery Voltage Transients

BATT

Description

SOT23-3

-40° to + 85° Operating Temperature Range

SOT23-5

PT7M7430xx

PT7M7431xx

Application



Monitoring lithiumion (Li+) cells or multicell alkaline/

1 GND

LBOL

NiCd/ NiMH power supplies.

The PT7M7433/34/35 are single-level battery monitors

with internal hysteresis. These devices are offered with

single low-battery output indicators which can be used

PT7M7429xx

to indicate three battery conditions: good (operate

1 LBO

system in normal mode), weak (operate system in low-

power mode), or empty (disable the system).

The PT7M7433/34/35 are

GND 3

user-adjustable threshold

voltages permitting the user to select the hysteresis

2 BATT

range and consequently the sensitivity of the system to

noise. A wide hysteresis range also prevents chattering

that can result due to battery recovery after load

PT7M7432xx

removal.

GND

LBOL

LBOH

BATT

LBOH

BATT

Pin Configuration

PT7M7433

PT7M7434

HTHIN

VCC

PT7M7435

HTHIN

VCC

PT7M7479H

PT7M7479L

HTH

VDD

GND

RST

(/RST)

LTHIN

LBO

LTHIN

LBO

LTH

SOT23-6

Pin Description

Name

HTHIN

GND

LTHIN

LBO/LBO

VCC

PT7M7436

PT7M7437

PT7M7438

1 HTHIN VCC

Monitor Input.

PT7M3806M

PT7M3806E

Type

Description

1 RSTSENSE HSENSE 6

resistor-divider network sets the high

threshold associated with LBO/LBO.

GND

Ground

LBOH

2 GND

LSENSE 5

LBOH 5

LTH Threshold Monitor Input.

A resistor-divider network sets the low

LBO/LBO.

LTHIN

threshold associated with

LTHIN LBOL 4

LBOL 4

3 RESET

VCC 4

Low-Battery Output.

LBO /LBO is asserted when LTHIN drops below V

LTHIN

and remains asserted for at least 90ms HTHIN rises above V

HTHIN

. Push-pull

output for PT7M7433. Open drain output for PT7M7434/35.

HTHIN

HTH Threshold

VCC 6

Supply Voltage.

Device power supply for adjustable threshold versions.

12-07-0002

PT0213-4

07/05/12

PT7M7433/34/35

P

Supervisory Circuit

Function Description

The PT7M7433/34/35 are available with user adjustable monitoring.

The user sets the threshold voltages for the PT7M7433/34/35, which permit the user to select the hysteresis range, and

consequently the sensitivity of the system to noise. A wide hysteresis range prevents chattering that can result during battery

recovery or load removal. The PT7M7433/34/35 have single low-battery outputs.

The PT7M7433/34/35 combine a 615mV reference with two comparators, logic, and timing circuitry to provide the user with

information about the charge state of the power-supply batteries. The PT7M7433/34/35 monitor separate high-voltage and low-

voltage thresholds to determine battery status. The output can be used to signal when the battery is charged, when the battery is

low, and when the battery is empty. PT7M7433/34/35 are also available with thresholds determined using an external resistor-

divider (see Application information

Resistor-Value Selection).

The adjustable versions can monitor down to 0.62V, making them

suitable for monitoring single-cell alkaline, NiMH, and NiCd applications (V

≥1.8V).

When the power-supply voltage drops below the specified low threshold, the low-battery output asserts (see

Low-Battery Output).

When the voltage rises above the specified high threshold following a 90ms (min) time-out period, the low-battery output is

deasserted (see

Threshold Monitoring).

This ensures the supply voltage has stabilized before power-converter or microprocessor

activity is enabled.

Low-Battery Output

The low-battery outputs are available in active-low (LBO, push-pull and open-drain) and action-high (LBO open-drain)

configurations. Push-pull outputs are referenced to V

(for adjustable threshold versions).

The open-drain devices can be pulled to a voltage independent of V

or BATT, up to 5.5V. This allows the device to monitor and

operate from direct battery voltage while interfacing to higher voltage microprocessors.

The PT7M7433/34/35 single-output voltage monitors provide a single low-battery output, LBO/LBO. The PT7M7433/34

adjustable-threshold parts assert LBO/LBO when the LTHIN input drops below the V

LTHIN

threshold (615mV).

Threshold Monitoring

The PT7M7433/34/35 HTHIN and LTHIN inputs are high-impedance inputs to comparators. An external resistor divider network

is required between the monitored voltage, HTHIN, LTHIN, and GND to select the desired thresholds (see Application

information

Resistor-Value Selection).

The PT7M7433/34/35 single-output voltage monitors assert LBO /LBO when LTHIN

drops below the internal LTHIN reference (615mV). LBO/LBO is deasserted when HTHIN rises above the internal HTHIN

reference level (615mV) for at least 90ms (see AC Electrical Characteristics: Fig 1).

Hysteresis

Hysteresis increases the comparator’s noise margin by increasing the upper threshold or decreasing the lower threshold (see blow).

The hysteresis prevents the output from oscillating (chattering) when V

is near the low-battery threshold. This is especially

important for applications where the load on the battery creates significant fluctuations in battery voltages.

Adjustable Hysteresis (PT7M7433/34/35)

Block diagram shows the correct connections for the external resistor-dividers. To adjust the low-battery threshold and hysteresis

connect resistor R1 between V

and LTHIN, resistor R2 between LTHIN and HTHIN, and R3 between HTHIN and GND. The

hysteresis for the PT7M7433/34/35 is determined by an external resistor-divider network (see Application information

Resistor-

Value Selection).

12-07-0002

PT0213-4

07/05/12

PT7M7433TAE Related Products

	PT7M7433TAE	PT7M7435TAE	PT7M7434	PT7M7433
Description	Supervisory Circuit	Supervisory Circuit	Supervisory Circuit	Supervisory Circuit

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