PT7M7436TAE

GND 2 3 GND BATT 2 3 BATT PT7M7436/37/38 |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| SOT23-5 Features  1 GND LBOL  User-Adjustable Low/High Thresholds 585mV/615mV Internal Reference 2 NC Low Current (1.5μA typ)  Dual Low-Battery Outputs  Push-Pull active low, Open-Drain active low and Open-Drain active high output options   PT7M7433 90ms Minimum LBOA/LBOL Timeout Period PT7M7434 Immune to Short Battery Voltage Transients  PPT7M7432xx Supervisory Circuit PT7M7430xx PT7M7431xx 3 1 HTHIN 2 GND 3 LTHIN with LBOH VCC -40°C to + 85°C Operating Temperature Range LBO BATT Description 5 1 GND LBOL PT7M7479H PT7M7479L PT7M7435 Applications  5 4 5 The PT7M7436/37/38 are dual-level battery monitors with internal hysteresis. These devices are offered with 2 NC dual low-battery output indicators which can be used to indicate three battery3 conditions: good 4 LBOH BATT 4 (operate system in normal mode), weak (operate system in low-power mode), or empty (disable the system). 1 5 5 HTHIN VCC Monitoring lithiumion (Li1 +) HTH cells VDD or multicell alkaline/ NiCd/ NiMH power supplies. 2 GND 3 LTHIN LBO 4 2 GND 3 LTH RST 4 (/RST) Pin Configuration SOT23-6 PT7M7436 PT7M7437 1 HTHIN 2 3 PT7M3806M PT7M3806E PT7M7438 VCC 6 1 HTHIN VCC 6 1 RSTSENSE HSENSE 6 GND LBOH 5 2 GND LBOH 5 2 GND LTHIN LBOL 4 3 LTHIN LBOL 4 3 RESET LSENSE 5 VCC 4 Pin Description Pin Name Type 1 HTHIN I 2 GND P 3 LTHIN I 4 LBOL /LBOL O 5 LBOH /LBOH VCC O 6 P Description HTH Threshold Monitor Input. A resistor-divider network sets the high threshold associated with LBOH/LBOH. Ground LTH Threshold Monitor Input. A resistor-divider network sets the low threshold associated with LBOL/LBOL. Low-Battery Output Low. LBOL/LBOL is asserted when LTHIN drops below V LTHIN-. It remains asserted for at least 90ms after LTHIN rises above V LTHIN+. Push-pull output for PT7M7436, open-drain output for PT7M7437/38. Low-Battery Output High. LBOH/LBOH is asserted when HTHIN drops below VHTHIN. It remains asserted for at least 90ms after HTHIN rises above V HTHIN+. Push-pull output for PT7M7436, open-drain output for PT7M7437/38. Supply Voltage. Device power supply. 12-07-0002 PT0212-6 1 07/05/12 PT7M7436/37/38 P Supervisory Circuit ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Maximum Ratings Storage Temperature ............................................................-65 C to +150 C Ambient Temperature with Power Applied.......................... -40oC to +85oC Supply Voltage to Ground Potential (Vcc to GND) ..............-0.3V to +7.0V DC Input Voltage (All inputs except Vcc and GND)......-0.3V to VCC+0.3V DC Output Current (All outputs) ..........................................................20mA Power Dissipation .............................................................................. 320mW o o (Depend on package) Note: Stresses greater than those listed under MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. DC Electrical Characteristics (VCC = 1.8V to 5.5V, TA= -40~85ºC, unless otherwise noted. Typical values are at TA = +25ºC) Description Symbol Operating Voltage Range VCC TA= -40~85ºC VCC Supply Current ICC VCC = 3.7V, no load, TA= -40~85ºC Output High Voltage (Push-Pull only) Output Low Voltage VOH VOL Test Conditions Min Typ Max Unit 1.8 - 5.5 V - 1.5 2.5 μA VCC ≥ 1.6V, Isource = 200μA 0.8×Vcc - - VCC ≥ 2.7V, Isource = 500μA 0.8×Vcc - - VCC ≥ 4.5V, Isource = 800μA 0.8×Vcc - - VCC ≥ 1.6V, Isink = 100μA - - 0.3 VCC ≥ 2.7V, Isink = 1.2mA - - 0.3 VCC ≥ 4.5V, Isink = 3.2mA - - 0.4 V V Open-Drain Output Leakage Current ILKG - - - 1 μA Input Leakage Current ILKG VHTHIN or VLTHIN > 400mV - - 20 nA TA= 25ºC -2 - +2 % TA= -10~85ºC - 100 - ppm/ºC TA= 25ºC -2 - +2 % TA= -10~85ºC - 100 - ppm/ºC TA= 25ºC -2 - +2 % TA= -10~85ºC - 100 - ppm/ºC TA= 25ºC -2 - +2 % TA= -10~85ºC - 100 - ppm/ºC User-adjustable Thresholds (PT7M7436/37/38) HTHIN+ Threshold (Note 1) VHTHIN+ HTHIN- Threshold (Note 2) VHTHIN- LTHIN+ Threshold (Note 1) VLTHIN+ LTHIN- Threshold (Note 2) VLTHIN- HTHIN rising, LBOH is deasserted when HTHIN rises above 615mV. HTHIN falling, LBOH is asserted when HTHIN falls below VHTHIN-. VREF = 585mV LTHIN rising, LBOL is deasserted when LTHIN rises above VLTHIN+. VREF = 615mV LTHIN falling, LBOL is asserted when LTHIN falls below VLTHIN-. VREF = 585mV Note 1: Typical value is 615mV. Minimum and Maximum value is percentage of typical value. Note 2: Typical value is 585mV. Minimum and Maximum value is percentage of typical value. 12-07-0002 PT0212-6 2 07/05/12 PT7M7436/37/38 P Supervisory Circuit ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| AC Electrical Characteristics Fig 1. PT7M7436/37/38 timing diagram VCC VHTH+ VHTHVLTH+ VLTH- tLBOP tLBOD LBOL (PT7M7436/37) tLBOP tLBOD LBOH (PT7M7436/37) tLBOP tLBOD LBOL (PT7M7438) tLBOP tLBOD LBOH (PT7M7438) (VCC = 1.8V to 5.5V, TA= -40~85ºC, unless otherwise noted. Typical values are at T A = +25ºC) Symbol Description Test Conditions Min Typ Max Unit tLBOP Timeout period - 90 200 350 ms tLBOD Delay - - 100 - s 12-07-0002 PT0212-6 3 07/05/12 PT7M7436/37/38 P Supervisory Circuit ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Block Diagram VCC R1 VCC LTHIN R2 HTHIN HYSTERESIS SWITCH R3 LBO TIMOUT PERIOD LBOL (LBOL) LBOH (LBOH) VCC 615 mV HYSTERESIS SWITCH LBOL/LBOH: PT7M7436/37 LBOL/LBOH: PT7M748 Function Description The PT7M7436/37/38 are available with user adjustable monitoring. The open-drain devices can be pulled to a voltage independent of VCC, up to 5.5V. This allows the device to monitor and operate from direct battery voltage while interfacing to higher voltage microprocessors. The PT7M7436/37/38 combine a 585/615mV reference with two comparators, logic, and timing circuitry to provide the user with information about the charge state of the powersupply batteries. The PT7M7436/37/38 monitor separate highvoltage and low-voltage thresholds to determine battery status. The outputs can be used to signal when the battery is charged, when the battery is low, and when the battery is empty. PT7M7436/37/38 are also available with thresholds determined using an external resistor-divider (see Application information Resistor-Value Selection). They can monitor down to 0.62V, making them suitable for monitoring singlecell alkaline, NiMH, and NiCd applications (VCC ≥1.8V). The PT7M7436/37/38 dual-output voltage monitors provide two low-battery outputs, LBOH/LBOH and LBOL/LBOL. They will assert LBOH /LBOH when HTHIN drops below VHTHIN-, and assert LBOL/LBOL when LTHIN drops below VLTHIN-. Threshold Monitoring The PT7M7436/37/38 dual-output voltage monitors assert LBOL/LBOL when LTHIN drops below the LTHINthreshold and deassert LBOL/LBOL when LTHIN rises above the LTHIN+ threshold for at least 90ms. LBOH/LBOH is asserted when HTHIN drops below the HTHIN- threshold and is deasserted when HTHIN rises above the HTHIN+ threshold for at least 90ms (see AC Electrical Characteristics: Fig 1). 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 lowbattery output is deasserted (see Threshold Monitoring). This ensures the supply voltage has stabilized before powerconverter or microprocessor activity is enabled. Hysteresis Hysteresis increases the comparator’s noise margin by increasing the upper threshold or decreasing the lower threshold. The hysteresis prevents the output from oscillating (chattering) when VCC is near the low-battery threshold. This is especially important for applications where the load on the battery creates significant fluctuations in battery voltages. The hysteresis for the PT7M7436/37/38 is the differences between VHTHIN- and VHTHIN+ (1.05) or VLTHIN- and VLTHIN+ (1.05). Low-Battery Output The low-battery outputs are available in active-low (LBOH, LBOL push-pull and open drain) and active-high (LBOH, LBOL open drain) configurations. Push-pull outputs are referenced to VCC. 12-07-0002 PT0212-6 4 07/05/12 PT7M7436/37/38 P Supervisory Circuit ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Application Information 2) Calculate R3 based on RTOTAL and the desired upper trip point: Resistor-Value Selection (Programming the Adjustable Thresholds) VREF = VLTHIN- = VHTHIN- = 585mV R3 = VTRIPLOW = VLTH- = VREF ( R1 + R2 + R3 ) R2 + R3 R1 + R2 + R3 ) VTRIPHIGH = VHTL- = VREF ( R3 VREF × RTOTAL VTRIPHIGH = 585mV × RTOTAL VTRIPHIGH 3) Calculate R2 based on RTOTAL, R3, and the desired lower trip point: RTOTAL = R1 + R2 + R3 R2 = Use the following steps to determine values for R1, R2, and R3 of Functional Block Diagram. 1) Choose a value for RTOTAL, the sum of R1, R2, and R3. Because the PT7M7436~PT7M7438 have very high input impedances, RTOTAL can be up to 5MΩ. 585mV × RTOTAL VTRPLOW - R3 4) Calculate R1 based on RTOTAL, R3, and R2: R1 = RTOTAL – R2 – R3 VHTH+ = VHTH- ×1.05, VLTH+ = VLTH- ×1.05 Mechanical Information TAE (SOT23-6) PKG. DIMENSIONS(MM) SYMBOL Min Max A 0.70 0.90 A1 0.00 0.10 A2 0.70 0.80 b 0.35 0.50 c 0.08 0.20 Note: 1) Controlling dimensions in millimeters. 12-07-0002 D 2.82 E E1 e e1 L θ 1.60 1.70 2.65 2.95 0.95 BSC 1.90 BSC 0.30 0.60 0° 8° 3.02 PT0212-6 5 07/05/12 PT7M7436/37/38 P Supervisory Circuit ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Ordering Information Part Number PT7M7436TAE PT7M7437TAE PT7M7438TAE Package Code TA TA TA Package lead-free and Green SOT23-6 Lead-free and Green SOT23-6 lead-free and Green SOT23-6 Marking Code MP fN MR Note:  E = Pb-free and Green  Adding X Suffix= Tape/Reel SOT-23 Package Top Marking Instruction MP PJ PART NO. 2 BIT CODE (See Table1) Sample: MPPJ Lead-Free Sign -: lead free and Green DATE CODE YEAR & WORK WEEK PART NO.: PT7M7436 DATE CODE: YEAR 2005 WW10 Lead free and Green package 1. 2. 3. 4. Package Type: SOT-23 Package Code: TA 2005-Year Code: P Work Week Code: WW7-G WW8-H WW9-I WW10-J WW11-K WW12-L WW13-M WW14-N WW15-O WW16-P WW17-Q 5. Font Style: HELVETICA or ARIAL 6. Max Characters Per Line (Only 1 line): 4 7. Max Characters Height: 0.8 mm 8. Min Characters Height: 0.6 mm 9. Max Characters Width: 0.6 mm 10. Mark Placement: Center Table 1. Function comparison of PT7M7436/37/38 Output Item Part No. Open-Drain Push-Pull Active high Active low Active low 1 PT7M7436  2 PT7M7437  3 PT7M7438  Single Dual -    Threshold Factory User fixed adjustable    Pericom Semiconductor Corporation  1-800-435-2336  www.pericom.com Pericom reserves the right to make changes to its products or specifications at any time, without notice, in order to improve design or performance and to supply the best possible product. Pericom does not assume any responsibility for use of any circuitry described other than the circuitry embodied in Pericom product. The company makes no representations that circuitry described herein is free from patent infringement or other rights, of Pericom. 12-07-0002 PT0212-6 6 07/05/12