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| 型号： | TPS62321YZDT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.89 A SWITCHING REGULATOR, 3350 kHz SWITCHING FREQ-MAX, BGA8 |
| 封装： | GREEN, DSBGA-8 |
| 文件页数： | 9/37页 |
| 文件大小： | 1401K |
| 代理商： | TPS62321YZDT |
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LOW-DROPOUT OPERATION 100% DUTY CYCLE
ENABLE
UNDERVOLTAGE LOCKOUT
SHORT-CIRCUIT PROTECTION
THERMAL SHUTDOWN
SLVS528E – JULY 2004 – REVISED NOVEMBER 2007
In 100% duty cycle mode, the TPS6230x, TPS6231x, and TPS6232x offer a low input-to-output voltage
difference. In this mode, the P-channel MOSFET is constantly turned on. This is particularly useful in
battery-powered applications to achieve the longest operation time by taking full advantage of the whole battery
voltage range. The minimum input voltage to maintain regulation, depending on the load current and output
voltage, can be calculated as:
V
I(MIN) = VO(MAX) + IO(MAX) x (rDS(on) MAX + RL)
I
O(MAX) : Maximum output current
r
DS(on) MAX : Maximum P-channel switch rDS(on)
R
L : DC resistance of the inductor
V
O(MAX) : nominal output voltage plus maximum output voltage tolerance
The device starts operation when EN is set high and starts up with the soft start as previously described.
Pulling the EN pin low forces the device into shutdown, with a shutdown quiescent current of typically 0.1
A. In
this mode, the P and N-channel MOSFETs are turned off, the internal resistor feedback divider is disconnected,
and the entire internal-control circuitry is switched off. When an output voltage is present during shutdown mode,
which can be caused by an external voltage source or super capacitor, the reverse leakage is specified under
electrical characteristics. For proper operation, the EN pin must be terminated and must not be left floating.
In addition, the TPS6232x devices integrate a resistor, typically 35
, to actively discharge the output capacitor
when the device turns off. The required time to discharge the output capacitor at VO depends on load current.
The undervoltage lockout circuit prevents the device from misoperation at low input voltages. It prevents the
converter from turning on the switch or rectifier MOSFET under undefined conditions.
The TPS6231x devices have a UVLO threshold set to 2 V (typical). Fully functional operation is permitted down
to 2.4 V input voltage. EN is set low for input voltages lower than 2.4 V to avoid the possibility of misoperation.
TPS6231x devices are to be considered where the user requires direct control of the turn-off sequence as part of
a larger power management system.
As soon as the output voltage falls below 50% of the nominal output voltage, the converter current limit is
reduced by 50% of the nominal value. Because the short-circuit protection is enabled during start-up, the device
does not deliver more than half of its nominal current limit until the output voltage exceeds 50% of the nominal
output voltage. This needs to be considered when a load acting as a current sink is connected to the output of
the converter.
As soon as the junction temperature, TJ, exceeds typically 150°C, the device goes into thermal shutdown. In this
mode, the P- and N-channel MOSFETs are turned off. The device continues its operation when the junction
temperature falls below typically 130
°C again.
Copyright 2004–2007, Texas Instruments Incorporated
17
Product Folder Link(s): TPS62300, TPS62301, TPS62302 TPS62303, TPS62304, TPS62305, TPS62311, TPS62313,
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