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| 型号： | TPS59116RGET |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, PQCC24 |
| 封装： | 4 X 4 MM, GREEN, PLASTIC, VQFN-24 |
| 文件页数： | 6/36页 |
| 文件大小： | 827K |
| 代理商： | TPS59116RGET |
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TI Information — Selective Disclosure
SLUSA57 – NOVEMBER 2010
www.ti.com
Current Protection for VTT
The LDO has an internally fixed constant overcurrent limiting of 3.8 A while operating at normal condition. This
trip point is reduced to 2.2 A before the output voltage comes within ±5% of the target voltage or goes outside of
±10% of the target voltage.
Overvoltage and Undervoltage Protection for VDDQ
TPS59116 monitors a resistor divided feedback voltage to detect overvoltage and undervoltage. If VDDQSET is
connected to V5IN or GND, the feedback voltage is made by an internal resistor divider inside VDDQSNS pin. If
an external resistor divider is connected to VDDQSET pin, the feedback voltage is VDDQSET voltage itself.
When the feedback voltage becomes higher than 115% of the target voltage, the OVP comparator output goes
high and the circuit latches as the top MOSFET driver OFF and the bottom MOSFET driver ON.
Also, TPS59116 monitors VDDQSNS voltage directly and if it becomes greater than 4 V TPS59116 turns off the
top MOSFET driver. When the feedback voltage becomes lower than 70% of the target voltage, the UVP
comparator output goes high and an internal UVP delay counter begins counting. After 32 cycles, TPS59116
latches OFF both top and bottom MOSFETs. This function is enabled after 1007 cycles of SMPS operation to
ensure startup.
V5FILT Undervoltage Lockout (UVLO) Protection
TPS59116 has 5-V supply undervoltage lockout protection (UVLO). When the V5FILT voltage is lower than
UVLO threshold voltage, SMPS, VTTLDO and VTTREF are shut off. This is a non-latch protection.
V5FILT Input Capacitor
Add a ceramic capacitor with a value between 1.0 mF and 4.7 mF placed close to the V5FILT pin to stabilize yhe
5-V input from any parasitic impedance.
Thermal Shutdown
TPS59116 monitors the temperature of itself. If the temperature exceeds the threshold value, 160°C (typ),
SMPS, VTTLDO and VTTREF are shut off. This is a non-latch protection and the operation is resumed when the
device is cooled down by about 10°C.
14
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): TPS59116
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