參數(shù)資料
型號(hào)： TPS2071DAPRG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 電源管理
英文描述： 4-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO32
封裝： PLASTIC, HTSSOP-32
文件頁數(shù)： 24/29頁
文件大?。?/td> 732K
代理商： TPS2071DAPRG4
www.ti.com
DETAILED DESCRIPTION
BP
SP
OUT1, OUT2, OUT2, OUT4
SLVS287B – SEPTEMBER 2000 – REVISED SEPTEMBER 2007
TERMINAL FUNCTIONS
TERMINAL
I/O
DESCRIPTION
NAME
NO.
3.3V_OUT
11
O
3.3-V internal voltage regulator output
AGND
3
Analog ground
BP
30
I
Bus power voltage input, connect to VBUS
Active-high logic input, disables autoswitch to bus power when self-power is disconnected. Connect to BP or
BP_DIS
31
I
GND
BPMODE
12
O
A logic signal that indicates if the outputs source from the bus-powered supply. BPMODE (TPS2070) or
(1)
BPMODE (TPS2071) can be used to signal hub controller.
CP_M
19
Charge-pump-capacitor connection from CP_P. Recommend 0.01-
μF between CP_P and CP_M.
CP_P
18
Charge-pump-capacitor connection from CP_M. Recommend 0.01-
μF between CP_P and CP_M.
DGND
16
Digital ground
DP0_RST
13
O
Connects to DP signal from upstream hub/host through an external 1.5-k
resistor
EN1
2
I
Active-low enable for OUT1
EN2
15
I
Active-low enable for OUT2
EN3
20
I
Active-low enable for OUT3
EN4
21
I
Active-low enable for OUT4
EN_REG
14
I
Active-high enable, enables external voltage regulator. Connect to BP or GND
GATE
10
O
Output gate drive for an external N-channel MOSFET
NC
1, 4, 8
No internal connection
OC1
22
O
Logic output, overcurrent response for OUT1
OC2
23
O
Logic output, overcurrent response for OUT2
OC3
24
O
Logic output, overcurrent response for OUT3
OC4
25
O
Logic output, overcurrent response for OUT4
OUT1
29
O
Power switch output for downstream ports
OUT2
28
O
Power switch output for downstream ports
OUT3
27
O
Power switch output for downstream ports
OUT4
26
O
Power switch output for downstream ports
PG
5
O
Logic output, power good
PG_DLY(2)
32
Adjusts the PG time delay with a capacitor to ground. Adjust the pulse duration to fit the application.
SP
6, 7
I
Self-power voltage input, connects to local power supply
VCP
17
Charge-pump output, source for an external voltage-regulator driver. Recommend 0.1-
μF capacitor to DGND.
VEXT
9
I
Input voltage for the external voltage regulator
(1)
Pin 12 is active-low for TPS2070 and active-high for TPS2071.
(2)
Use the following formula to calculate the capacitance needed: C = (desired pulse duration
× 3 × 10–6)/1.22
The bus-powered supply input (BP) serves as the source for the internal 3.3-V LDO and for all logic functions in
the device. In bus-powered mode, BP also serves as the source for all the outputs (OUTx). If BP is below the
undervoltage threshold, all power switches turn off and the LDO is disabled. BP must be connected to a voltage
source for the device to operate.
The self-powered supply input (SP) serves as the source for all the outputs (OUTx) in self-powered mode. The
enable logic for the SP switches requires that BP be connected to a voltage source.
OUTx are the outputs of the integrated power switches.
4
Copyright 2000–2007, Texas Instruments Incorporated
Product Folder Link(s): TPS2070 TPS2071
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