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LMZ34002 Fiches technique(PDF) 3 Page - Texas Instruments

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No de pièce LMZ34002
Description  2A, Negative Output, SIMPLE SWITCHER짰 Power Module with 4.5V-40V Input in QFN Package
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

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LMZ34002
www.ti.com
SNVS989A – JULY 2013 – REVISED SEPT 2013
ELECTRICAL CHARACTERISTICS
-40°C
≤ TA ≤ +85°C, VIN = 12 V, VOUT = –5.0 V, IOUT = 2.0A
CIN = 2 x 2.2 µF ceramic, COUT = 2 x 47 µF ceramic (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
IOUT
Output current
Over input voltage and output voltage range
0(1)
2.0(2)
A
VIN
Input voltage range
Over output current range
4.5
40(3)
V
UVLO
VIN Undervoltage lockout
Rising only, RUVLO1 = 174 kΩ, RUVLO2 = 63.4 kΩ
4.5
V
VOUT(adj)
Output voltage adjust range
Over output current range
–3.0
–17(3)
V
Set-point voltage tolerance
TA = 25°C, IOUT = 100 mA
2.0% (4)
Temperature variation
–40°C
≤ TA ≤ +85°C
±0.5%
±1.0%
VOUT
Line regulation
Over input voltage range
±0.1%
Load regulation
From 100 mA to IOUT(max)
±0.4%
Total output voltage variation
Includes set-point, line, load, and temperature variation
3.0% (4)
VOUT = –12 V, IOUT = 1.0 A
85 %
VIN = 24 V
VOUT = –5.0 V, IOUT = 1.0 A
81 %
VOUT = –3.3 V, IOUT = 1.0 A
77 %
η
Efficiency
VIN = 12 V
VOUT = –12 V, IOUT = 0.6 A
86 %
VOUT = –5.0 V, IOUT = 1.0 A
81 %
VOUT = –3.3 V, IOUT = 1.0 A
78 %
Output voltage ripple
20 MHz bandwith, 100 mA
≤ IOUT ≤ IOUT(max)
1%
VOUT
ILIM
Current limit threshold
3.0 (5)
A
Recovery time
500
µs
1.0 A/µs load step from 25 to 75%
Transient response
IOUT(max)
VOUT over/undershoot
80
mV
VINH
Inhibit threshold voltage
INH with respect to A_VOUT
1.15
1.25
1.36 (6)
V
VINH < 1.15 V
–0.9
μA
IINH
INH Input current
VINH > 1.36 V
–3.8
μA
II(stby)
Input standby current
INH pin to A_VOUT
1.3
4
µA
fSW
Switching frequency
RT pin to A_VOUT
700
800
900
kHz
RRT = 0 Ω
700 (7)
900 (7)
kHz
fCLK
Synchronization frequency
RRT = 93.1 kΩ
400 (7)
600 (7)
kHz
VCLK-H
CLK High-Level Threshold
With respect to A_VOUT
1.9
2.2
V
VCLK-L
CLK Low-Level Threshold
With respect to A_VOUT
0.5
0.7
V
DCLK
CLK Duty cycle
25%
50%
75%
Thermal shutdown
180
°C
Thermal Shutdown
Thermal shutdown hysteresis
15
°C
Ceramic
4.7 (8)
10
CIN
External input capacitance
µF
Non-ceramic
22
COUT
External output capacitance
100(9)
430 (9)
µF
(1)
This device can regulate VOUT down to 0 A, however the ripple may increase due to pulse-skipping at light loads. See Light-Load
Behavior for more information. See No-Load Operation when operating at 0 A.
(2)
The maximum current is dependant on VIN and VOUT, see Figure 33.
(3)
The sum of VIN + |VOUT| must not exceed 50 V.
(4)
The stated limit of the set-point voltage tolerance includes the tolerance of both the internal voltage reference and the internal
adjustment resistor. The overall output voltage tolerance will be affected by the tolerance of the external RSET resistor.
(5)
This product is not designed to endure a sustained (> 5 sec) over-current condition.
(6)
If this pin is left open circuit, the device operates when input power is applied. An external level-shifter is required to interface with this
pin. See Output On/Off Inhibit (INH) for further guidance.
(7)
The synchronization frequency is dependant on VIN and VOUT as shown in Switching Frequency. RRT must be either 0 Ω or 93.1kΩ.
(8)
A minimum of 4.7 µF of ceramic external capacitance is required across the input (VIN and PGND connected) for proper operation.
Locate the capacitor close to the device. See Table 1 for more details.
(9)
The amount of required capacitance must include at least 2 x 47 µF ceramic capacitor (or 4 x 22 µF). Locate the capacitance close to
the device. Adding additional capacitance close to the load improves the response of the regulator to load transients. See Table 1 for
more details. See Inrush Current section when adding additional output capacitance.
Copyright © 2013, Texas Instruments Incorporated
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