NT1770A. 2/3/4/5-Cell Lithium-lon/Polymer Protector. Features. Description. Applications

Transcription

1 2/3/4/-Cell Lithium-lon/Polymer Protector Features High accuracy circuit Over-charge : 2mV Over-discharge : 0mV over-current- : 0% over-current-2 : 0% Load short-circuiting : 0% Charge over-current : mv/ 0mV Temperature : 4 High withstand Absolute maximum rating: 30V Operating range: 3.V to 2V Low power consumption Supply current: 6.6uA max. (Ta=+2 ) Delay times of over-charge, load short-circuiting, charge over-current and over/under are generated by an internal circuit (fixed). Delay times of over-discharge, discharge over-current- and -2 are controlled by external capacitors. Built-in breaking wire detector function Package: 20 pin TSSOP Lead-free, Sn 00%, Halogen-free Description The NT770 series are the 2/3/4/-cell protection IC with protection for lithium-ion/lithium-polymer/lithium-iron phosphate rechargeable battery pack. The high accuracy, current detector and circuits are built in NT770 series with state-of-the-art design and process. The NT770 series have three types of discharge over-current protection and one type of charge over-current protection. The NT770 series have three types of over during charging, over- during discharging and under- during charging protection. Applications Lithium-ion rechargeable battery pack Lithium-polymer rechargeable battery pack Lithium-iron phosphate rechargeable battery pack Neotec Semiconductor Ltd., /7 DS V.04

2 Typical Application Circuit P+ D 4.3MΩ.6MΩ Q 2.2KΩ 00Ω 00Ω 0MΩ Q4 Option-/2/3 for different applications 2.2KΩ 0MΩ 0.00uF CO COP V- 2 VMP CS 3 DOP DO 4 VINI CT2 CDT CT3 6 CCT 7 VSS VSS NC CTLC VDD 6 CTLD VC VDD VC2 4 V VC3 V4 3 VC4 V3 2 V2 CTL V SEL 0 SEL2 NC SEL ZD KΩ KΩ 470KΩ 470KΩ 2.2uF 00Ω KΩ KΩ KΩ KΩ KΩ BAT BAT4 BAT3 BAT2 BAT CHG- Q Q2 RSENSE P- Q3 Option Without protection () Option 2 Without protection (2) Option 3 With protection NTC 0KΩ 0.00uF 0.00uF 2.2KΩ 39KΩ These devices have limited build-in ESD protection. The leads must be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. Neotec Semiconductor Ltd., 2/7 DS V.04

3 Package and Pin Configurations TSSOP-20L Top view Pin No. Symbol Pin description CO 2 V- 3 CS 4 DO FET gate control pin for charging path (Pch open-drain output). Normal mode : High Over-charge mode : Hi-impedance Input terminal connected to charger negative. over-current and load short-circuiting detector. Input of overcurrent. Detected overcurrent by sense resistor between CS pin and pin. Detected charger and load connection. FET gate control pin for discharging path (CMOS output) Normal mode : High Over-discharge mode : Low Voltage regulator 2 output pin 6 CT2 Capacitor connection for over-discharge. 7 CT3 Capacitor connection for discharge over-current- and -2. Temperature terminal. 9 VSS The input terminal of the negative of V cell. 0 The input terminal of the ground of IC. SEL 2 SEL2 For 2cell, 3cell, 4cell or cell in series. SEL pin SEL2 pin Application VDD VDD cells application VDD 4 cells application (Connect V=VSS) VDD 3 cells application (Connect V2=V=VSS) 2 cells application (Connect V3=V2=V=VSS) 3 V Cell V positive and cell V2 negative input pin 4 V2 Cell V2 positive and cell V3 negative input pin V3 Cell V3 positive and cell V4 negative input pin 6 V4 Cell V4 positive and cell V negative input pin 7 V Cell V positive VDD Power supply input pin Neotec Semiconductor Ltd., 3/7 DS V.04

4 (Continued) Pin No. Symbol Pin description 9 CTLD 20 CTLC The control terminal of output over-discharge. I CTLD > I CTLD H DO pin : Normal mode I CTLD < I CTLD L DO pin : Low level The control terminal of output over-charge. I CTLC > I CTLC H CO pin : Normal mode I CTLC < I CTLC L CO pin : Hi-impedance Neotec Semiconductor Ltd., 4/7 DS V.04

5 Block Diagram SEL SEL2 CTLD CTLC VDD V 7 Over-charge control and delay circuit CO MUX V4 6 Over-discharge control and delay circuit 4 DO V3 2 V- over-current- V2 4 over-current-2 Over control and delay circuit for discharging current V VSS Load short-circuit Charge over-current Over control and delay circuit for charging current Under- control and delay circuit for charging current Regulator 3 CS 7 CT3 6 CT2 Neotec Semiconductor Ltd., /7 DS V.04

6 Ordering Information -XXX XX Package Type Q4: TSSOP-20L Version Code Product version code: Table : Detection threshold level Product Name Version Code Package Type Overcharge V DET Overcharge V REL Overdischarge V DET2 Overdischarge V REL2 overcurrent- V DET3 overcurrent-2 V DET32 Charge overcurrent V DET4 Load shortcircuiting V SHORT TDA Q FKA Q FWA Q Remark: Please contact our sales for the products with value other than those specified above. Table 2: Temperature threshold Product Name Version Code Package Type over TH over RELTH Charge over TH2 Charge over RELTH2 Charge under TH3 Charge under RELTH3 TDA Q FKA Q FWA Q Table 3: Function Product Name Version Code Package Type Over-charge condition Over-discharge condition 0 V battery charge function Built-in breaking wire detector function Delay time (Table 4) TDA Q4 (a) Voltage Available Yes () FKA Q4 Voltage or Available Yes () FWA Q4 (b) Charge current Available Yes () Remark: For the details, please refer to the description of Operations Neotec Semiconductor Ltd., 6/7 DS V.04

7 Table 4: Delay time Delay time () Over-charge t VDET (s) ±30% Over-discharge t VDET2 (s) (at C CT2=) ±0% over-current- t VDET3 (ms) (at C CT3=0.00uF) - over-current-2 t VDET32 (ms) (at C CT3=0.00uF) 0 ±0% Load short-circuiting t SHORT (us) /-40% Charge over-current t VDET4 (ms) 00 ±30% Temperature t (s) +00%/-0% Neotec Semiconductor Ltd., 7/7 DS V.04