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TPS70158PWPRG4 Datasheet(PDF) 10 Page - Texas Instruments

Part # TPS70158PWPRG4
Description  Dual-Output Low Dropout Voltage Regulators with Power-Up Sequencing for Split-Voltage DSP Systems
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS70158PWPRG4 Datasheet(HTML) 10 Page - Texas Instruments

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TPS70145, TPS70148
TPS70151, TPS70158
TPS70102
SLVS222I – DECEMBER 1999 – REVISED AUGUST 2010
www.ti.com
Table 1. TERMINAL FUNCTIONS
TERMINAL
I/O
DESCRIPTION
NAME
NO.
EN
6
I
Active low enable
GND
8
Ground
MR1
4
I
Manual reset input 1, active low, pulled up internally
MR2
5
I
Manual reset input 2, active low, pulled up internally
NC
1, 11, 20
No connection
Open drain output, low when VOUT1 voltage is less than 95% of the nominal regulated
PG1
16
O
voltage
RESET
15
O
Open drain output, SVS (power-on reset) signal, active low
Power-up sequence control: SEQ = High, VOUT2 powers up first;
SEQ
7
I
SEQ = Low, VOUT1 powers up first, SEQ terminal pulled up internally.
VIN1
2, 3
I
Input voltage of regulator 1
VIN2
9, 10
I
Input voltage of regulator 2
VOUT1
18, 19
O
Output voltage of regulator 1
VOUT2
12, 13
O
Output voltage of regulator 2
VSENSE2/FB2
14
I
Regulator 2 output voltage sense/regulator 2 feedback for adjustable
VSENSE1/FB1
17
I
Regulator 1 output voltage sense/regulator 1 feedback for adjustable
Detailed Description
The TPS701xx low dropout regulator family provides dual regulated output voltages for DSP applications that
require high-performance power management solutions. These devices provide fast transient response and high
accuracy with small output capacitors, while drawing low quiescent current. Programmable sequencing provides
a power solution for DSPs without any external component requirements. This architecture reduces the
component cost and board space while increasing total system reliability. The TPS701xx family has an enable
feature that puts the device in sleep mode reducing the input currents to less than 3mA. Other features are
integrated SVS (Power-On Reset, RESET) and Power Good (PG1) that monitor output voltages and provide
logic output to the system. These differentiated features provide a complete DSP power solution.
The TPS701xx, unlike many other LDOs, feature very low quiescent current that remains virtually constant even
with varying loads. Conventional LDO regulators use a pnp pass element, the base current of which is directly
proportional to the load current through the regulator (IB = IC/b). The TPS701xx uses a PMOS transistor to pass
current; because the gate of the PMOS is voltage=driven, operating current is low and stable over the full load
range.
Pin Functions
Enable
The EN terminal is an input that enables or shuts down the device. If EN is at a voltage high signal, the device is
in shutdown mode. When EN goes to voltage low, the device is enabled.
Sequence
The SEQ terminal is an input that programs which output voltage (VOUT1 or VOUT2) is turned on first. When the
device is enabled and the SEQ terminal is pulled high or left open, VOUT2 turns on first and VOUT1 remains off until
VOUT2 reaches approximately 83% of its regulated output voltage. At that time, VOUT1 is turned on. If VOUT2 is
pulled below 83% (for example, in an overload condition) VOUT1 is turned off. These terminals have a 6-mA pullup
current to VIN1.
Pulling the SEQ terminal low reverses the power-up order and VOUT1 is turned on first. For detailed timing
diagrams, refer to Figure 40 through Figure 44.
10
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Copyright © 1999–2010, Texas Instruments Incorporated


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