BQ25504 Datasheet, PDF (3/24 Pages) Texas Instruments – Ultra Low Power Boost Converter with Battery Management for Energy Harvester Applications

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bq25504
SLUSAH0 – OCTOBER 2011
THERMAL INFORMATION
THERMAL METRIC⁽¹⁾⁽²⁾
bq25504
RGT (16 PINS)
UNITS
θ_JA
θ_JCtop
θ_JB
ψ_JT
ψ_JB
θ_JCbot
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
48.5
63.9
22
°C/W
1.8
22
6.5
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
(2) For thermal estimates of this device based on PCB copper area, see the TI PCB Thermal Calculator.
RECOMMENDED OPERATING CONDITIONS
V_IN (DC)
VBAT
DC input voltage into VIN_DC⁽¹⁾
Battery voltage range⁽²⁾
C_HVR
C_STOR
C_BAT
C_REF
R_OC1 + R_OC2
R_OK1 + R_OK2 + R_OK3
R_UV1 + R_UV2
R_OV1 + R_OV2
L_BST
T_A
T_J
Input capacitance
Storage capacitance
Battery pin capacitance or equivalent battery capacity
Sampled reference storage capacitance
Total resistance for setting for MPPT reference.
Total resistance for setting reference voltage.
Total resistance for setting reference voltage.
Total resistance for setting reference voltage.
Input inductance
Operating free air ambient temperature
Operating junction temperature
(1) Maximum input power ≤ 300 mW. Cold start has been completed
(2) VBAT_OV setting must be higher than VIN_DC
MIN NOM
0.13
2.5
4.23 4.7
4.23 4.7
100
9
10
18
20
9
10
9
10
9
10
19.8
22
–40
–40
MAX
3
5.25
5.17
5.17
11
22
11
11
11
24.2
85
105
UNIT
V
V
µF
µF
µF
nF
MΩ
MΩ
MΩ
MΩ
µH
°C
°C
ELECTRICAL CHARACTERISTICS
Over recommended temperature range, typical values are at T_A = 25°C. Unless otherwise noted, specifications apply for
conditions of VIN_DC = 1.2V, VBAT = VSTOR = 3V. External components L_BST = 22 µH, C_HVR = 4.7 µF C_STOR= 4.7 µF.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
BOOST CONVERTER \ CHARGER STAGE
V_IN (DC)
I_IN (DC)
P_IN
V_INCS
P_IN CS
DC input voltage into VIN_DC
Peak Current flowing from V_IN into VIN_DC input
Input power range for normal charging
Cold-start Voltage. Input voltage that will start
charging of VSTOR
Minimum cold-start input power to start normal
charging
Cold-start completed
0.5V < V_IN < 3 V; VSTOR = 4.2 V
VBAT > VIN_DC; VIN_DC = 0.5 V
VBAT < VBAT_UV; VSTOR = 0 V;
0°C < T_A < 85°C
VBAT < VBAT_UV; VSTOR = 0 V; Input source
impedance 0 Ω
130
200
0.01
330
10
3000 mV
300 mA
300 mW
450 mV
50 µW
VSTOR_CHGEN
Voltage on VSTOR when cold start operation ends
and normal charger operation begins
1.6
1.77
1.95
V
R_BAT(on)
Resistance of switch between VBAT and VSTOR
when turned on.
VBAT = 4.2 V; VSTOR load = 50 mA
2
Ω
R_DS(on)
Charger Low Side switch ON resistance
Charger rectifier High Side switch ON resistance
VBAT = 2.1 V
VBAT = 4.2 V
VBAT = 2.1 V
VBAT = 4.2 V
2
Ω
2
5
Ω
5
f_{SW_BST}
Boost converter mode switching frequency
1 MHz
Copyright © 2011, Texas Instruments Incorporated
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