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PDF STMEC001 Data sheet ( Hoja de datos )
| Número de pieza | STMEC001 | |
| Descripción | Power interface switch | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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STMEC001
Power interface switch for ExpressCardTM
Features
■ Compliant with PC Card™ standard for
ExpressCard
■ 3-channel power interface switch
■ Built-in under-voltage lockout (UVLO) circuit
www.Data■SheUeltt4rUa.-cloowm standby-mode current
■ Additional 5 V or 12 V power supply not
required
■ High reliability ensured with integrated over-
current, thermal and undervoltage protection
circuitries applied to each voltage rail
■ Soft start function for non-rush current
■ Ultra-low standby-mode current for power
saving
■ Ultra-low ON resistance for fast switching
QFN16
TSSOP20
Description
The STMEC001 is an ExpressCard power
interface switch which provides the complete
power management solution required by the
ExpressCard specification.
The STMEC001 consists of 3 internal switches
distributing 3.3 V, 3.3VAUX, and 1.5 V to the
ExpressCard socket without the need of additional
charge pump or external switches.
The STMEC001 ExpressCard power switch is
ideal for notebook computers, desktop computers,
personal digital assistants (PDA), or other
handheld devices implementing the ExpressCard
schematic.
Table 1. Device summary
Order code
STMEC001QTR
STMEC001ATTR
April 2008
.
Package
QFN16
TSSOP20
Rev 4
Packing
Tape and reel
Tape and reel
1/19
www.st.com
19
1 page  
STMEC001
1.1 Pin functional description
Pin description
Table 3. Pin detailed descriptions
Symbol
Description
CPPE
A logic low level on this input indicates that the card present supports PCI Express
functions. This input pin connects to the 3.3 VAUX input through a 150 kΩ internal pull up.
When inserted, the card physically connects this input to ground if the card supports PCI
Express functions.
CPUSB
A logic low level on this input indicates that the card present supports USB functions. The
input pin CPUSB connects to the 3.3 VAUX input through a 150 kΩ internal pull up. When
inserted, the card physically connects CPUSB to ground if the card supports USB
functions.
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SHDN
When asserted (logic low), this input instructs the STMEC001 to turn off all voltage
outputs and the discharge FETs at the 3 outputs are activated.
STBY
When asserted (logic low), this input places the power switch in Standby Mode by turning
off the 3.3 V and 1.5 V power switches and keeping the 3.3 VAUX switch on.
RCLKEN
This pin serves as both an input and an output. On power up, the power switch keeps this
signal at a low state as long as any of the output power rails are out of their tolerance
range. Once all output power rails are within tolerance, the power switch releases
RCLKEN allowing it to transition to a high state (internally pulled up to 3.3 VAUX). The
transition of RCLKEN from a low to a high state starts an internal timer for the purpose of
de-asserting /PERST. As an input, RCLKEN can be kept low to delay the start of the
/PERST internal timer. RCLKEN can be used by the host system to enable a clock driver.
On power up, this output remains asserted. Once all power rails are within tolerance,
PERST RCLKEN is asserted and /PERST is de-asserted after a time delay. On power down, this
output is asserted whenever any of the power rails drop below their voltage tolerance.
SYSRST
This input is driven by the host system and directly affects /PERST. Asserting /SYSRST
(logic level: low) forces /PERST to assert.
The OC pin is an open drain output for over-current indication. Output does not turn off
OC
during over-current condition. The output voltage decreases as the output current
exceeds over-current limit. Only if the temperature increases above the limit the output is
turned off completely. Over-current in one output does not affect the other outputs.
5/19
5 Page 
STMEC001
Electrical characteristics
Table 7.
Symbol
Electrical characteristics
TJ = 25° C, VI(VIN 3.3 V) = VI(VIN 3.3VAUX)= 3.3 V, VI(VIN 1.5 V) = 1.5 V (continued)
Parameter
Test conditions
Min Typ Max Unit
IO(3.3 V) limit
(limit is the steady state
value)
IOS IO(1.5 V) limit
IO(VAUX) limit
TJ -40° C to100° C
Output powered into a short
TJ -40° C to100° C
Output powered into a short
TJ -40° C to 100° C
Output powered into a short
1.3 2.5 A
650 1300 mA
275 660
1. Switch resistance (in production - probe testing at 1.3 A. Final test at 1.0 A and apply guard band)
www.DataTSahbeleet48U..com Power switching
Symbol
Parameter
Test condition
Min Typ Max Unit
Tsh Thermal shutdown, trip point, TJ.
Hysteresis
Over-current condition
155 165 ° C
10 ° C
Current limit response time.
VO (3.3VOUT) with100 mΩ short
IOL From short to first threshold within 1.1 times VO (1.5VOUT) with100 mΩ short
of the final current limit
VO (VAUX) with100 mΩ short
Input quiescent current:
normal operation
VIN_3.3VAUX
VIN_3.3V
VIN_1.5V
VO (VAUX) = VI(3.3VAUX) =
VI(3.3VIN) VO(1.5V) = VI(1.5VIN)
TJ -40° C,100° C
Outputs are ON and unloaded
5 20
5 20 μs
5 20
120
40
10
VIN_3.3VAUX VO(VAUX) = VI(3.3VAUX) = VI(3.3VI
IQ
Input quiescient current:
normal operation with pull-up
VIN_3.3V
N) VO(1.5 V) = VI(1.5VIN)
TJ -40° C,100° C]
VIN_1.5V
Outputs are ON and unloaded
150 180
25 40 μA
10 25
Input quiescient current:
/SHDN asserted with pull-up
VIN_3.3VAUX TJ -40° C,100° C
VIN_3.3V
discharge FETs are ON
VIN_1.5V
150 270
10 15
10 15
SHDN
Forward leakage current (current measured
at input pins/no card present)
/SHDN inactive
VIN_3.3VAUX
VIN_3.3V
VIN_1.5V
50 100
15 20 μA
5 10
Reverse leakage current
ILEAK(1) (current measured from
output pins / input grounded)
TJ = 25 ° C
VIN_3.3VAUX TJ = 100 ° C
VIN_1.5V
TJ = 25 ° C
TJ = 100 ° C
5 10
20 50
10 15
μA
30 50
VIN_3.3V
TJ = 25 ° C
TJ = 100 ° C
10 15
30 50
1. All high side switches are in Hi-Z state, VO (AUX) = VO (3.3 V) = 3.3 V, Vo (1.5 V) = 1.5 V, TJ -40 ° C,100 ° C
11/19
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet STMEC001.PDF ] | |
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