TDA21321 Datasheet, PDF (11/32 Pages) Infineon Technologies AG – Desktop and Server Vcore and non-Vcore buck-converter

TDA21321
Electrical Specification
Table 9
Voltage Supply And Biasing Current
Parameter Symbol
Values
Unit Note / Test Condition
Min. Typ. Max.
UVLO VCIN V_{UVLO1_R}
rising
3.0 – 4.0 V
Driver enable threshold; above threshold driver is active,
driver responds to PWM input when UVLO VDRV and
UVLO BOOT are enabled, TMON/FAULT reports driver
temperature when UVLO VDRV is enabled
UVLO VCIN V_{UVLO1_F}
falling
2.6 – 3.6
Driver disable threshold; below threshold driver is inactive,
PWM and TMON/FAULT held low by pull-down resistors
UVLO VDRV V_{UVLO2_R}
rising
4.16 4.25 4.34 V
GL, GH and TMON/FAULT enable threshold; when UVLO
VCIN is enabled then: above threshold GL is enabled, GH
depends on UVLO BOOT, TMON/FAULT is released to
report driver temperature
UVLO VDRV V_{UVLO2_F}
falling
3.7 3.8 3.9
GL, GH and TMON/FAULT disable threshold; when UVLO
VCIN is enabled: below threshold after 3 consecutive cycles
or 15 µs (typ.) the driver outputs GL/GH are disabled,
TMON/FAULT stops temperature reporting and is held low
by pull-down resistor
UVLO BOOT V_{UVLOboot_R} 3.88 4.05 4.22 V
rising
UVLO BOOT V_{UVLOboot_F} 3.5 3.63 3.76
falling
Driver current I_{VDRV_600kHz} – 18 – mA
I_{VDRV_1MHz}
– 30
–
IC current
(control)
I_{VCIN_O}
– 1.0 – mA
V_BOOT-V_SW rising, GH enable threshold; when UVLO VCIN
and UVLO VDRV are active: above threshold GH responds
to PWM
V_BOOT-V_SW falling, GL/GH disable threshold; when UVLO
VCIN and UVLO VDRV are enabled: below threshold
counter starts, after 3 consecutive PWM cycles driver
outputs are disabled
OFF# = 3.3 V, f_SW = 600 kHz
OFF# = 3.3 V, f_SW = 1 MHz
OFF# = 3.3 V, PWM = Open for > 19 µs (typ.)
IC quiescent
Pre-Bias at
SW
I_CIN+I_DRV
V_{SW_0}
– 1.2 –
– 120 160 mV PWM in Tri-state (V_{PWM_S}), VCIN = VDRV = 5V, internal pull-
down resistor 1.5 kΩ
Table 10 Current Sense
Parameter
Symbol
Values
Unit Note / Test Condition
Min. Typ. Max.
IMON
Voltage Range
V_IMON
IMONREF IMON gain resistor R_IMON
range
Current sense gain a_CS
0.8 – 2.2 V IMONREF is a current mirror output serving
0.2 – 1.0 kΩ ^{as unfiltered reference node. At IMON a}
filtered voltage signal proportional to the
current is provided. It tracks the average
- 6.67 - µA/A _{value of IMONREF.}
Leakage current I_Leak
Current Zero current offset I_Offset
Monitoring
Accuracy at 25 °C a11
… 125 °C
a12
V_DRV = 5 V ± 10 % _a13
V_CIN = 5 V ± 10 % _a14
-2 0 2 µA I_D = 0, V_CM = 1.5, PWM in tri-state
-3 0 3 µA Corresponds to 2.25 mV at 5 mV/A
(R_IMON = 750Ω), device in regulation
-3 – 3 % for 45 A < Iout < I_OCPtrip tested at 25 A,
-2.5 – 2.5 % for 25 A ≤ Iout ≤ 45 A ^{other guaranteed}
by design
-0.5 – 0.5 A for -25 < Iout < 25 A
-20 – 20 % for -50 A ≤ Iout ≤ -25 A
Data Sheet
11
Revision 2.4, 2015-07-16