TPS62120_15 Datasheet, PDF (5/34 Pages) Texas Instruments – TPS6212x 15-V, 75-mA Highly Efficient Buck Converter

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TPS62120, TPS62122
SLVSAD5A – JULY 2010 – REVISED AUGUST 2015
7.4 Thermal Information
THERMAL METRIC⁽¹⁾
TPS62120
DCN [SOT-23]
TPS62122
DRV [DFN]
UNIT
8 PINS
6 PINS
R_θJA
R_θJC(top)
R_θJB
ψ_JT
ψ_JB
R_θJC(bot)
Junction-to-ambient thermal resistance
Junction-to-case(top) thermal resistance
Junction-to-board thermal resistance
Junction-to-top characterization parameter
Junction-to-board characterization parameter
Junction-to-case(bottom) thermal resistance
259.7
114.1
185.8
21.6
121.6
n/a
114.4
73.7
201.9
0.8
94.9
122.7
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC PackageThermal Metrics application
report, SPRA953
7.5 Electrical Characteristics
V_IN = 8 V, V_OUT = 1.8 V, EN = V_IN, T_J = –40°C to 85°C, typical values are at T_J = 25°C (unless otherwise noted), C_IN = 4.7 µF,
L = 22 µH, C_OUT = 4.7 µF
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNIT
SUPPLY
V_IN
Input voltage range⁽¹⁾
I_Q
Quiescent current
Device operating
I_OUT = 0 mA, device not switching, EN = VIN,
regulator sleeps
I_OUT = 0 mA, device switching, V_IN = 8 V, V_OUT = 1.8
V
2
15 V
11 18
µA
13
I_Active
I_SD
Active mode current consumption
Shutdown current
V_UVLO
Undervoltage lockout threshold
ENABLE, THRESHOLD
V_IN = 5.5 V = V_OUT, T_J = 25°C, high-side MOSFET
switch fully turned on
EN = GND, V_OUT = SW = 0 V, V_IN = 3.6 V ⁽²⁾
Falling V_IN
Rising V_IN
240 275 µA
0.3 1.2 µA
1.85 1.95
V
2.5 2.61
V_{IH TH}
Threshold for detecting high EN
V_{IL TH HYS} Threshold for detecting low EN
I_IN
Input bias current, EN
POWER SWITCH
2 V ≤ V_IN ≤ 15 V, rising edge
2 V ≤ V_IN ≤ 15 V, falling edge
EN = GND or V_IN
0.8 1.1 V
0.4 0.6
V
0 50 nA
R_DS(ON)
I_LIMF
High-side MOSFET ON-resistance
Low-side MOSFET ON-resistance
Forward current limit MOSFET high-
side
V_IN = 3.6 V
V_IN = 8 V
V_IN = 3.6 V
V_IN = 8 V
V_IN = 8 V, open loop
2.3 3.4
1.75 2.5
Ω
1.3 2.5
1.2 1.75
200 250 400 mA
T_SD
Thermal shutdown
Thermal shutdown hysteresis
Increasing junction temperature
Decreasing junction temperature
150
°C
20
°C
REGULATOR
t_ONmin
t_OFFmin
V_REF
V_FB
I_IN
Minimum ON time
Minimum OFF time
Internal reference voltage
Feedback FB voltage comparator
threshold
Feedback FB voltage line regulation
Input bias current FB
V_IN = 3.6 V, V_OUT = 1.8 V
V_IN = 3.6 V, V_OUT = 1.8 V
Referred to 0.8-V internal reference
I_OUT = 50 mA ⁽³⁾
V_FB = 0.8 V
700
ns
60
ns
0.8
V
–2.5% 0% 2.5%
0.04
%/V
0 50 nA
(1) The typical required supply voltage for startup is 2.5 V. The part is functional down to the falling UVLO (undervoltage lockout) threshold.
(2) Shutdown current into VIN pin, includes internal leakage.
(3) V_OUT +1 V ≤ V_IN ; V_OUT ≤ 5.5 V
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